/* ─── RESET & BASE ─────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'DM Sans',sans-serif;
  background:#0a0b0e;
  color:#e8e6e0;
  min-height:100vh;
  overflow-x:hidden;
  line-height:1.6;
}

/* ─── TOKENS ────────────────────────────────────────────────── */
:root{
  --bg:#0a0b0e;
  --bg2:#111318;
  --bg3:#181c23;
  --surface:#1c2028;
  --surface2:#222830;
  --border:#2a3040;
  --border2:#343d50;
  --text:#e8e6e0;
  --muted:#8a8f9e;
  --hint:#555d70;
  --accent:#00c896;
  --accent2:#00a87e;
  --accent-glow:rgba(0,200,150,0.15);
  --accent-dim:rgba(0,200,150,0.08);
  --red:#e55;
  --red-dim:rgba(238,85,85,0.12);
  --amber:#f0a840;
  --amber-dim:rgba(240,168,64,0.12);
  --blue:#5b9cf6;
  --blue-dim:rgba(91,156,246,0.12);
  --mono:'JetBrains Mono',monospace;
  --display:'Clash Display',sans-serif;
  --r:8px;
  --r2:12px;
  --r3:16px;
}

/* ─── SCROLLBAR ─────────────────────────────────────────────── */
::-webkit-scrollbar{width:5px;height:5px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--border2);border-radius:10px}
::-webkit-scrollbar-thumb:hover{background:var(--hint)}

/* ─── PAGES ─────────────────────────────────────────────────── */
.page{display:none;min-height:100vh}
.page.active{display:block}
#app-page{display:none;height:100vh;overflow:hidden;flex-direction:column}
#app-page.active{display:flex}

/* ══════════════════════════════════════════════════════════════
   LANDING PAGE
══════════════════════════════════════════════════════════════ */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  padding:0 40px;height:64px;
  display:flex;align-items:center;gap:32px;
  background:rgba(10,11,14,0.85);
  backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(255,255,255,0.04);
}
.nav-logo{
  font-family:var(--display);font-size:22px;font-weight:700;
  color:var(--accent);letter-spacing:-0.5px;cursor:pointer;
  display:flex;align-items:center;gap:6px;
}
.nav-logo span{color:var(--text)}
.nav-links{display:flex;gap:28px;margin-left:auto}
.nav-link{font-size:14px;color:var(--muted);text-decoration:none;transition:color 0.2s;cursor:pointer;font-weight:400;}
.nav-link:hover{color:var(--text)}
.nav-cta{
  padding:8px 20px;background:var(--accent);color:#0a0b0e;
  border:none;border-radius:var(--r);font-size:14px;font-weight:600;
  cursor:pointer;transition:all 0.2s;font-family:'DM Sans',sans-serif;margin-left:8px;
}
.nav-cta:hover{background:#00e0aa;transform:translateY(-1px)}

.hero{min-height:100vh;display:flex;align-items:center;padding:100px 80px 80px;position:relative;overflow:hidden;}
.hero-bg{
  position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(ellipse 60% 50% at 70% 50%, rgba(0,200,150,0.06) 0%, transparent 70%),
    radial-gradient(ellipse 40% 60% at 10% 80%, rgba(91,156,246,0.04) 0%, transparent 60%);
}
.hero-grid{
  position:absolute;inset:0;pointer-events:none;opacity:0.3;
  background-image:linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size:60px 60px;
}
.hero-content{max-width:600px;position:relative;z-index:2}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:20px;
  background:var(--accent-dim);border:1px solid rgba(0,200,150,0.2);
  font-size:12px;font-weight:500;color:var(--accent);margin-bottom:28px;font-family:var(--mono);
}
.hero-badge-dot{width:6px;height:6px;border-radius:50%;background:var(--accent);animation:pulse 2s ease-in-out infinite;}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:0.3}}
.hero-title{font-family:var(--display);font-size:clamp(48px,6vw,80px);font-weight:700;line-height:1.05;letter-spacing:-2px;margin-bottom:24px;}
.hero-title .accent{color:var(--accent)}
.hero-title .line2{display:block;color:var(--muted);font-size:0.75em}
.hero-sub{font-size:18px;color:var(--muted);line-height:1.7;max-width:480px;margin-bottom:40px;font-weight:300;}
.hero-actions{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.btn-primary{
  padding:14px 32px;background:var(--accent);color:#0a0b0e;border:none;border-radius:var(--r);
  font-size:15px;font-weight:600;cursor:pointer;transition:all 0.2s;font-family:'DM Sans',sans-serif;
  display:inline-flex;align-items:center;gap:8px;
}
.btn-primary:hover{background:#00e0aa;transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,200,150,0.25)}
.btn-secondary{
  padding:14px 28px;background:transparent;color:var(--text);border:1px solid var(--border2);
  border-radius:var(--r);font-size:15px;font-weight:500;cursor:pointer;transition:all 0.2s;font-family:'DM Sans',sans-serif;
}
.btn-secondary:hover{border-color:var(--muted);background:var(--surface)}
.hero-stats{display:flex;gap:40px;margin-top:56px;padding-top:40px;border-top:1px solid var(--border);}
.hero-stat-num{font-family:var(--display);font-size:32px;font-weight:700;color:var(--text);letter-spacing:-1px;}
.hero-stat-label{font-size:13px;color:var(--hint);margin-top:2px}

.hero-visual{position:absolute;right:80px;top:50%;transform:translateY(-50%);width:520px;z-index:2;pointer-events:none;}
.code-window{
  background:var(--bg3);border:1px solid var(--border2);border-radius:var(--r3);overflow:hidden;
  box-shadow:0 32px 80px rgba(0,0,0,0.6),0 0 0 1px rgba(255,255,255,0.03);
}
.code-win-bar{display:flex;align-items:center;gap:8px;padding:12px 16px;background:var(--surface);border-bottom:1px solid var(--border);}
.win-dot{width:10px;height:10px;border-radius:50%}
.win-dot.r{background:#ff5f57}.win-dot.y{background:#febc2e}.win-dot.g{background:#28c840}
.win-title{font-family:var(--mono);font-size:11px;color:var(--hint);margin-left:8px}
.code-body{padding:20px;font-family:var(--mono);font-size:13px;line-height:1.8}
.kw{color:#c792ea}.fn{color:#82aaff}.str{color:#c3e88d}.num{color:#f78c6c}
.cm{color:var(--hint);font-style:italic}.ac{color:var(--accent)}

.result-preview{
  margin-top:12px;background:var(--bg3);border:1px solid var(--border2);border-radius:var(--r3);overflow:hidden;
  box-shadow:0 16px 40px rgba(0,0,0,0.4);
}
.rp-bar{display:flex;align-items:center;padding:10px 16px;background:var(--surface);border-bottom:1px solid var(--border);gap:8px;}
.rp-label{font-size:11px;color:var(--hint);font-family:var(--mono)}
.rp-ok{margin-left:auto;font-size:11px;color:var(--accent);font-family:var(--mono);font-weight:500;}
.rp-table{width:100%;border-collapse:collapse;font-family:var(--mono);font-size:12px}
.rp-table th{background:var(--surface2);padding:8px 14px;text-align:left;color:var(--hint);font-weight:500;border-bottom:1px solid var(--border);}
.rp-table td{padding:7px 14px;border-bottom:1px solid rgba(255,255,255,0.03);color:var(--text)}
.rp-table tr:last-child td{border-bottom:none}
.rp-table .val-acc{color:var(--accent);font-weight:500}

.features{padding:100px 80px;background:var(--bg2)}
.section-label{font-family:var(--mono);font-size:11px;color:var(--accent);text-transform:uppercase;letter-spacing:2px;margin-bottom:16px;}
.section-title{font-family:var(--display);font-size:clamp(32px,4vw,48px);font-weight:700;letter-spacing:-1px;line-height:1.15;margin-bottom:16px;}
.section-sub{font-size:16px;color:var(--muted);max-width:500px;line-height:1.7;margin-bottom:60px}

/* ── Redesigned Features ─────────────────────────────────── */
.features-intro{margin-bottom:52px}
.features-headline{
  font-family:var(--display);
  font-size:clamp(30px,3.8vw,46px);
  font-weight:700;letter-spacing:-1px;line-height:1.2;
  color:var(--text);margin-top:12px;
}
.features-headline-accent{color:var(--accent)}
.features-intro-sub{
  margin-top:20px;
  font-size:15px;color:var(--muted);
  max-width:600px;line-height:1.8;
}

/* row label */
.feat-row-label{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.feat-row-label::after{content:'';flex:1;height:1px;background:var(--border)}
.feat-row-tag{
  font-family:var(--mono);font-size:10.5px;font-weight:600;
  letter-spacing:0.1em;text-transform:uppercase;
  padding:4px 12px;border-radius:20px;white-space:nowrap;
}
.problem-tag{
  background:rgba(238,85,85,0.1);
  border:1px solid rgba(238,85,85,0.25);
  color:#e87070;
}
.solution-tag{
  background:var(--accent-dim);
  border:1px solid rgba(0,200,150,0.25);
  color:var(--accent);
}

.features-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:1px;
  background:var(--border);border:1px solid var(--border);border-radius:var(--r3);overflow:hidden;
}
.feature-card{
  background:var(--bg2);padding:32px 28px;
  display:flex;align-items:flex-start;gap:18px;
  transition:background 0.2s, transform 0.2s, box-shadow 0.2s;
  cursor:default;position:relative;overflow:hidden;
}
.feature-card::after{
  content:'';position:absolute;inset:0;opacity:0;
  transition:opacity 0.2s;pointer-events:none;
}

/* Problem cards */
.problem-grid{margin-bottom:40px}
.problem-card{background:var(--bg3)}
.problem-card::after{background:radial-gradient(circle at 50% 0%,rgba(238,85,85,0.06),transparent 70%)}
.problem-card:hover{background:#151820;transform:translateY(-3px);box-shadow:0 12px 32px rgba(0,0,0,0.35)}
.problem-card:hover::after{opacity:1}
.problem-card:hover .fc-icon-wrap.problem-icon{background:rgba(238,85,85,0.15);border-color:rgba(238,85,85,0.3)}

/* Solution cards */
.solution-grid{margin-bottom:48px}
.solution-card{background:var(--bg2)}
.solution-card::after{background:radial-gradient(circle at 50% 0%,rgba(0,200,150,0.07),transparent 70%)}
.solution-card:hover{background:var(--bg3);transform:translateY(-3px);box-shadow:0 12px 32px rgba(0,0,0,0.35)}
.solution-card:hover::after{opacity:1}
.solution-card:hover .fc-icon-wrap.solution-icon{background:rgba(0,200,150,0.18);border-color:rgba(0,200,150,0.35)}

/* icon wrap */
.fc-icon-wrap{
  width:44px;height:44px;border-radius:var(--r);flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  font-size:22px;transition:background 0.2s, border-color 0.2s;
}
.problem-icon{
  background:rgba(238,85,85,0.08);
  border:1px solid rgba(238,85,85,0.18);
}
.solution-icon{
  background:var(--accent-dim);
  border:1px solid rgba(0,200,150,0.2);
}

.fc-body{flex:1;min-width:0}

/* legacy support */
.feature-icon{
  width:44px;height:44px;border-radius:var(--r);background:var(--accent-dim);
  border:1px solid rgba(0,200,150,0.15);display:flex;align-items:center;justify-content:center;
  font-size:20px;margin-bottom:20px;
}
.feature-icon.blue{background:var(--blue-dim);border-color:rgba(91,156,246,0.2)}
.feature-icon.amber{background:var(--amber-dim);border-color:rgba(240,168,64,0.2)}
.feature-title{font-family:var(--display);font-size:17px;font-weight:600;margin-bottom:8px;color:var(--text)}
.feature-desc{font-size:13.5px;color:var(--muted);line-height:1.75}

/* ── Quote strip ─────────────────────────────────────────── */
.features-quote-strip{
  border:1px solid var(--border2);
  border-radius:var(--r3);
  background:linear-gradient(135deg,var(--bg3) 0%,var(--surface) 100%);
  padding:36px 48px;
  position:relative;overflow:hidden;
}
.features-quote-strip::before{
  content:'';position:absolute;top:-40px;right:-40px;
  width:160px;height:160px;border-radius:50%;
  background:radial-gradient(circle,rgba(0,200,150,0.08) 0%,transparent 70%);
  pointer-events:none;
}
.fqs-inner{display:flex;align-items:flex-start;gap:20px;max-width:760px;margin:0 auto;}
.fqs-mark{
  font-family:var(--display);font-size:64px;font-weight:800;
  color:var(--accent);line-height:1;flex-shrink:0;margin-top:-8px;opacity:0.6;
}
.fqs-text{
  font-family:var(--display);
  font-size:clamp(16px,2vw,20px);
  font-weight:500;color:var(--text);
  line-height:1.6;letter-spacing:-0.2px;
  font-style:italic;
}

.questions-section{padding:100px 80px;background:var(--bg)}
.q-cards{display:flex;flex-direction:column;gap:1px;background:var(--border);border:1px solid var(--border);border-radius:var(--r3);overflow:hidden;margin-top:48px}
.q-card{background:var(--bg2);padding:24px 28px;display:flex;align-items:center;gap:20px;cursor:pointer;transition:background 0.15s;}
.q-card:hover{background:var(--bg3)}
.q-card-num{font-family:var(--mono);font-size:12px;color:var(--hint);min-width:28px;font-weight:500;}
.q-card-title{font-size:15px;font-weight:500;flex:1}
.q-card-topic{font-family:var(--mono);font-size:11px;color:var(--hint);padding:3px 10px;background:var(--surface);border-radius:20px;border:1px solid var(--border2);}
.badge{padding:3px 10px;border-radius:20px;font-size:11px;font-weight:600;font-family:var(--mono);}
.badge.easy{background:rgba(0,200,150,0.12);color:var(--accent);border:1px solid rgba(0,200,150,0.2)}
.badge.medium{background:var(--amber-dim);color:var(--amber);border:1px solid rgba(240,168,64,0.2)}
.badge.hard{background:var(--red-dim);color:var(--red);border:1px solid rgba(238,85,85,0.2)}
.q-card-arrow{color:var(--hint);font-size:18px;transition:transform 0.15s}
.q-card:hover .q-card-arrow{transform:translateX(4px);color:var(--accent)}

/* ─── TOPIC FILTERS ───────────────────────── */

.topic-filters{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  margin-top:32px;
  margin-bottom:28px;
}

.topic-filter{
  padding:8px 16px;
  border-radius:999px;
  border:1px solid var(--border2);
  background:var(--surface);
  color:var(--muted);
  font-size:12px;
  font-family:var(--mono);
  cursor:pointer;
  transition:all 0.15s ease;
}

.topic-filter:hover{
  background:var(--surface2);
  color:var(--text);
}

.topic-filter.active{
  background:var(--accent);
  color:#0a0b0e;
  border-color:var(--accent);
  font-weight:600;
}

footer{padding:40px 80px;border-top:1px solid var(--border);display:flex;align-items:center;gap:16px;background:var(--bg);}
.footer-logo{font-family:var(--display);font-size:18px;font-weight:700;color:var(--accent)}
.footer-logo span{color:var(--muted)}
.footer-copy{font-size:13px;color:var(--hint);margin-left:auto}

/* ══════════════════════════════════════════════════════════════
   APP PAGE
══════════════════════════════════════════════════════════════ */
.app-nav{height:52px;background:var(--bg2);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 16px;gap:12px;flex-shrink:0;}
.app-logo{font-family:var(--display);font-size:18px;font-weight:700;color:var(--accent);cursor:pointer;display:flex;align-items:center;gap:4px;}
.app-logo span{color:var(--text)}
.app-divider{width:1px;height:24px;background:var(--border);margin:0 4px}
.q-pills-wrap{display:flex;gap:6px;overflow-x:auto;flex:1}
.q-pills-wrap::-webkit-scrollbar{height:0}
.q-pill{
  padding:5px 14px;border-radius:20px;font-size:12px;font-weight:500;
  border:1px solid var(--border2);background:transparent;cursor:pointer;
  color:var(--muted);transition:all 0.15s;font-family:'DM Sans',sans-serif;white-space:nowrap;flex-shrink:0;
}
.q-pill:hover{background:var(--surface);color:var(--text)}
.q-pill.active{background:var(--accent);color:#0a0b0e;border-color:var(--accent)}
.q-pill.solved{border-color:var(--accent);color:var(--accent)}
.q-pill.solved.active{background:var(--accent);color:#0a0b0e}
.app-nav-right{margin-left:auto;display:flex;align-items:center;gap:10px;flex-shrink:0}
.diff-badge{padding:3px 10px;border-radius:20px;font-size:11px;font-weight:600;font-family:var(--mono);}
.diff-easy{background:rgba(0,200,150,0.12);color:var(--accent);border:1px solid rgba(0,200,150,0.2)}
.diff-medium{background:var(--amber-dim);color:var(--amber);border:1px solid rgba(240,168,64,0.2)}
.diff-hard{background:var(--red-dim);color:var(--red);border:1px solid rgba(238,85,85,0.2)}

.workspace{display:flex;flex:1;overflow:hidden}
.left-panel{width:42%;min-width:300px;max-width:560px;background:var(--bg2);border-right:1px solid var(--border);overflow-y:auto;display:flex;flex-direction:column;flex-shrink:0;}
.prob-header{padding:24px 24px 0}
.prob-num{font-family:var(--mono);font-size:11px;color:var(--hint);font-weight:500;text-transform:uppercase;letter-spacing:1px;margin-bottom:8px;}
.prob-title{font-family:var(--display);font-size:22px;font-weight:700;line-height:1.2;margin-bottom:6px;letter-spacing:-0.5px;}
.prob-tags{display:flex;gap:6px;margin-top:12px;flex-wrap:wrap}
.prob-tag{padding:3px 10px;background:var(--surface);border:1px solid var(--border2);border-radius:20px;font-size:11px;color:var(--hint);font-family:var(--mono);}
.prob-body{padding:20px 24px;font-size:13.5px;line-height:1.8;color:var(--muted)}
.prob-body p{margin-bottom:12px}
.prob-body strong{color:var(--text);font-weight:500}
.prob-body code{font-family:var(--mono);font-size:12px;color:var(--accent);background:var(--accent-dim);padding:1px 6px;border-radius:4px;}

.schema-box{margin:16px 0;background:var(--bg3);border:1px solid var(--border);border-radius:var(--r2);overflow:hidden;}
.schema-header{padding:10px 14px;background:var(--surface);border-bottom:1px solid var(--border);font-family:var(--mono);font-size:11px;color:var(--accent);font-weight:500;text-transform:uppercase;letter-spacing:1px;}
.schema-tbl{width:100%;border-collapse:collapse}
.schema-tbl th{padding:8px 14px;text-align:left;font-size:11px;color:var(--hint);font-weight:500;font-family:var(--mono);border-bottom:1px solid var(--border);background:var(--surface2);}
.schema-tbl td{padding:7px 14px;font-size:12px;font-family:var(--mono);border-bottom:1px solid rgba(255,255,255,0.03);color:var(--text);}
.schema-tbl tr:last-child td{border-bottom:none}
.schema-tbl .col-type{color:var(--blue);font-size:11px}
.schema-tbl .col-pk{font-size:10px;color:var(--amber);background:var(--amber-dim);padding:1px 6px;border-radius:3px;}

.example-section{margin:16px 0}
.example-label{font-family:var(--mono);font-size:11px;color:var(--hint);text-transform:uppercase;letter-spacing:1px;font-weight:500;margin-bottom:8px;}
.example-wrap{border:1px solid var(--border);border-radius:var(--r2);overflow:hidden}
.ex-table{width:100%;border-collapse:collapse;font-family:var(--mono);font-size:12px}
.ex-table th{background:var(--surface2);padding:7px 12px;text-align:left;color:var(--muted);font-weight:500;border-bottom:1px solid var(--border);}
.ex-table td{padding:6px 12px;border-bottom:1px solid rgba(255,255,255,0.03);color:var(--text);}
.ex-table tr:last-child td{border-bottom:none}

.hint-wrap{margin:16px 0}
.hint-btn{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--blue);background:none;border:none;cursor:pointer;font-family:'DM Sans',sans-serif;padding:0;transition:opacity 0.15s;}
.hint-btn:hover{opacity:0.75}
.hint-text{margin-top:8px;padding:12px 14px;background:var(--blue-dim);border:1px solid rgba(91,156,246,0.2);border-radius:var(--r);font-size:13px;color:#a0c4ff;line-height:1.7;display:none;}
.hint-text.open{display:block}

.right-panel{flex:1;display:flex;flex-direction:column;overflow:hidden;background:var(--bg);gap:0;}
.editor-wrap{flex:1;display:flex;flex-direction:column;overflow:hidden;margin:12px 12px 6px;background:var(--bg2);border:1px solid var(--border2);border-radius:var(--r3);}
.editor-bar{display:flex;align-items:center;padding:10px 16px;gap:10px;border-bottom:1px solid var(--border);flex-shrink:0;}
.editor-lang{font-family:var(--mono);font-size:11px;color:var(--hint);text-transform:uppercase;letter-spacing:1px;font-weight:500;}
.editor-btns{margin-left:auto;display:flex;gap:8px}
.ebtn{padding:6px 16px;border-radius:var(--r);font-size:13px;font-weight:500;border:1px solid var(--border2);cursor:pointer;font-family:'DM Sans',sans-serif;transition:all 0.15s;background:transparent;color:var(--text);}
.ebtn:hover{background:var(--surface2)}
.ebtn:active{transform:scale(0.97)}
.ebtn-reset{color:var(--hint);font-size:12px}
.ebtn-run{border-color:rgba(0,200,150,0.3);color:var(--accent)}
.ebtn-run:hover{background:var(--accent-dim)}
.ebtn-submit{background:var(--accent);color:#0a0b0e;border-color:var(--accent);font-weight:600;}
.ebtn-submit:hover{background:#00e0aa;border-color:#00e0aa}
.ebtn-submit:disabled{opacity:0.4;cursor:not-allowed;transform:none}

.editor-body{flex:1;overflow:auto;padding:16px;display:flex;flex-direction:column;}
.editor-body textarea{flex:1;width:100%;min-height:160px;background:transparent;border:none;outline:none;resize:none;font-family:var(--mono);font-size:13.5px;color:var(--text);line-height:1.8;caret-color:var(--accent);}
.editor-body textarea::placeholder{color:var(--hint)}

.output-wrap{margin:0 12px 12px;background:var(--bg2);border:1px solid var(--border2);border-radius:var(--r3);max-height:280px;overflow-y:auto;flex-shrink:0;}
.output-bar{display:flex;align-items:center;padding:9px 16px;border-bottom:1px solid var(--border);position:sticky;top:0;background:var(--bg2);z-index:2;gap:8px;}
.output-label-text{font-family:var(--mono);font-size:11px;color:var(--hint);text-transform:uppercase;letter-spacing:1px;font-weight:500;}
.output-status-text{margin-left:auto;font-size:12px;font-weight:600;font-family:var(--mono);}
.ost-ok{color:var(--accent)}.ost-err{color:var(--red)}.ost-pass{color:var(--accent)}.ost-fail{color:var(--red)}

.output-body{padding:12px 16px}
.empty-state{text-align:center;padding:24px;color:var(--hint);font-size:13px;}
.empty-state .es-icon{font-size:28px;margin-bottom:8px;opacity:0.4}

.res-table-wrap{overflow-x:auto}
.res-table{width:100%;border-collapse:collapse;font-family:var(--mono);font-size:12px}
.res-table th{background:var(--surface2);padding:7px 14px;text-align:left;color:var(--muted);font-weight:500;border-bottom:1px solid var(--border);white-space:nowrap;}
.res-table td{padding:5px 14px;border-bottom:1px solid rgba(255,255,255,0.03);color:var(--text);white-space:nowrap;}
.res-table tr:last-child td{border-bottom:none}
.res-table tr:hover td{background:rgba(255,255,255,0.02)}

.err-block{background:var(--red-dim);border:1px solid rgba(238,85,85,0.2);border-radius:var(--r);padding:12px 14px;font-family:var(--mono);font-size:12.5px;color:#ffaaaa;line-height:1.7;white-space:pre-wrap;}

.tc-wrap{padding:10px 16px 14px;border-top:1px solid var(--border);}
.tc-label{font-family:var(--mono);font-size:11px;color:var(--hint);text-transform:uppercase;letter-spacing:1px;margin-bottom:10px;}
.tc-list{display:flex;flex-direction:column;gap:7px}
.tc-row{display:flex;align-items:center;gap:10px;font-size:13px}
.tc-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0;background:var(--border2);transition:background 0.2s;}
.tc-dot.pass{background:var(--accent)}.tc-dot.fail{background:var(--red)}
.tc-name{color:var(--muted);flex:1;font-size:12.5px}
.tc-res{font-size:11px;font-weight:600;font-family:var(--mono);}
.tc-res.pass{color:var(--accent)}.tc-res.fail{color:var(--red)}
.tc-err{margin-left:18px;font-size:11px;font-family:var(--mono);color:var(--red);opacity:0.8;margin-top:-4px;}

.solved-banner{display:none;margin:0 12px 8px;padding:10px 16px;background:rgba(0,200,150,0.1);border:1px solid rgba(0,200,150,0.25);border-radius:var(--r);font-size:13px;color:var(--accent);font-weight:500;align-items:center;gap:10px;flex-shrink:0;}
.solved-banner.show{display:flex}
.solved-check{width:18px;height:18px;border-radius:50%;background:var(--accent);display:flex;align-items:center;justify-content:center;color:#0a0b0e;font-size:10px;font-weight:700;flex-shrink:0;}

.progress-bar-wrap{height:3px;background:var(--border);flex-shrink:0;}
.progress-bar-fill{height:100%;background:var(--accent);transition:width 0.4s ease;}

.loading-screen{position:fixed;inset:0;background:var(--bg);z-index:999;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px;}
.loading-logo{font-family:var(--display);font-size:36px;font-weight:700;color:var(--accent);letter-spacing:-1px;}
.loading-logo span{color:var(--text)}
.loading-spinner{width:32px;height:32px;border:2px solid var(--border2);border-top-color:var(--accent);border-radius:50%;animation:spin 0.8s linear infinite;}
@keyframes spin{to{transform:rotate(360deg)}}
.loading-text{font-size:13px;color:var(--hint);font-family:var(--mono)}

@keyframes fadeUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
.fade-up{animation:fadeUp 0.5s ease forwards}
.fade-up-1{animation-delay:0.1s;opacity:0}.fade-up-2{animation-delay:0.2s;opacity:0}
.fade-up-3{animation-delay:0.3s;opacity:0}.fade-up-4{animation-delay:0.4s;opacity:0}
.fade-up-5{animation-delay:0.5s;opacity:0}

@media(max-width:900px){
  .hero-visual{display:none}
  .hero{padding:100px 32px 60px}
  .hero-title{font-size:42px}
  .features{padding:60px 24px}
  .features-headline{font-size:28px}
  .features-grid{grid-template-columns:1fr}
  .features-quote-strip{padding:28px 24px}
  .fqs-mark{font-size:48px}
  .questions-section{padding:60px 32px}
  .nav{padding:0 24px}
  footer{padding:32px}
  .left-panel{width:100%;max-width:100%;border-right:none;border-bottom:1px solid var(--border)}
  .workspace{flex-direction:column;overflow:auto}
}

.CodeMirror {
  height: 100% !important;
  font-family: var(--mono);
  font-size: 13.5px;
  background: transparent !important;
  color: var(--text);
  padding-top: 6px;
}

.CodeMirror-gutters {
  background: var(--bg2) !important;
  border-right: 1px solid var(--border) !important;
}

.CodeMirror-linenumber {
  color: var(--hint) !important;
  font-size: 12px;
}

.CodeMirror-cursor {
  border-left: 2px solid var(--accent) !important;
}

.CodeMirror-selected {
  background: rgba(255,255,255,0.08) !important;
}

.cm-s-material-darker.CodeMirror {
  background: transparent !important;
}

.cm-keyword {
  color: #c792ea !important;
  font-weight: 600;
}

.cm-operator {
  color: #89ddff !important;
}

.cm-number {
  color: #f78c6c !important;
}

.cm-string {
  color: #c3e88d !important;
}

.cm-comment {
  color: #676e95 !important;
  font-style: italic;
}

.cm-variable,
.cm-variable-2,
.cm-def {
  color: #e8e6e0 !important;
}

.cm-builtin {
  color: #82aaff !important;
}

.cm-atom {
  color: #ffcb6b !important;
}

/* ══════════════════════════════════════════════════════════════
   AUTH MODAL
══════════════════════════════════════════════════════════════ */
.modal-overlay{
  position:fixed;inset:0;z-index:1000;
  background:rgba(0,0,0,0.7);backdrop-filter:blur(6px);
  display:flex;align-items:center;justify-content:center;
  opacity:0;pointer-events:none;transition:opacity 0.2s ease;
}
.modal-overlay.open{opacity:1;pointer-events:all;}
.modal-box{
  background:var(--bg2);border:1px solid var(--border2);
  border-radius:var(--r3);width:100%;max-width:420px;
  box-shadow:0 32px 80px rgba(0,0,0,0.6);
  transform:translateY(16px);transition:transform 0.2s ease;overflow:hidden;
}
.modal-overlay.open .modal-box{transform:translateY(0);}
.modal-tabs{display:flex;align-items:center;border-bottom:1px solid var(--border);padding:0 4px;}
.modal-tab{
  flex:1;padding:14px 0;background:none;border:none;
  font-family:'DM Sans',sans-serif;font-size:14px;font-weight:500;
  color:var(--hint);cursor:pointer;border-bottom:2px solid transparent;
  margin-bottom:-1px;transition:all 0.15s;
}
.modal-tab:hover{color:var(--muted)}
.modal-tab.active{color:var(--accent);border-bottom-color:var(--accent)}
.modal-close{
  padding:8px 14px;background:none;border:none;
  color:var(--hint);font-size:18px;cursor:pointer;line-height:1;
  transition:color 0.15s;margin-left:auto;
}
.modal-close:hover{color:var(--text)}
.modal-form{padding:28px 32px 32px}
.modal-logo{font-family:'Clash Display',sans-serif;font-size:22px;font-weight:700;color:var(--accent);margin-bottom:6px;}
.modal-logo span{color:var(--text)}
.modal-sub{font-size:13px;color:var(--hint);margin-bottom:24px}
.form-group{margin-bottom:16px}
.form-label{display:block;font-size:12px;font-weight:500;color:var(--muted);margin-bottom:6px;text-transform:uppercase;letter-spacing:0.5px;}
.form-input{
  width:100%;padding:10px 14px;background:var(--bg3);
  border:1px solid var(--border2);border-radius:var(--r);
  font-family:'DM Sans',sans-serif;font-size:14px;color:var(--text);
  outline:none;transition:border-color 0.15s;
}
.form-input::placeholder{color:var(--hint)}
.form-input:focus{border-color:var(--accent)}
.form-error{font-size:12.5px;color:var(--red);min-height:18px;margin-bottom:12px;line-height:1.5;}
.form-btn{
  width:100%;padding:12px;background:var(--accent);color:#0a0b0e;
  border:none;border-radius:var(--r);
  font-family:'DM Sans',sans-serif;font-size:15px;font-weight:600;
  cursor:pointer;transition:all 0.15s;
}
.form-btn:hover{background:#00e0aa;transform:translateY(-1px)}
.form-btn:disabled{opacity:0.6;cursor:not-allowed;transform:none}
.modal-switch{text-align:center;font-size:13px;color:var(--hint);margin-top:16px;}
.modal-switch span{color:var(--accent);cursor:pointer;font-weight:500;}
.modal-switch span:hover{text-decoration:underline}

/* ══════════════════════════════════════════════════════════════
   NAV AUTH CONTROLS
══════════════════════════════════════════════════════════════ */
.nav-auth{display:flex;align-items:center;gap:10px;margin-left:auto}
.nav-cta-ghost{
  padding:8px 18px;background:transparent;border:1px solid var(--border2);
  border-radius:var(--r);font-size:14px;font-weight:500;color:var(--text);
  cursor:pointer;transition:all 0.15s;font-family:'DM Sans',sans-serif;
}
.nav-cta-ghost:hover{border-color:var(--muted);background:var(--surface)}
.nav-user{display:flex;align-items:center;gap:10px;margin-left:auto}
.btn-login-nav{
  padding:5px 14px;background:transparent;border:1px solid var(--border2);
  border-radius:var(--r);font-size:12.5px;font-weight:500;color:var(--text);
  cursor:pointer;transition:all 0.15s;font-family:'DM Sans',sans-serif;
}
.btn-login-nav:hover{border-color:var(--accent);color:var(--accent)}
.app-user{display:flex;align-items:center;gap:8px}
.user-avatar-sm{
  width:28px;height:28px;border-radius:50%;
  background:var(--accent);color:#0a0b0e;
  font-size:11px;font-weight:700;
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.user-name-sm{font-size:13px;color:var(--text);font-weight:500;max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.btn-logout-sm{
  padding:4px 10px;background:transparent;border:1px solid var(--border2);
  border-radius:var(--r);font-size:11.5px;color:var(--hint);
  cursor:pointer;transition:all 0.15s;font-family:'DM Sans',sans-serif;
}
.btn-logout-sm:hover{border-color:var(--red);color:var(--red)}
.btn-profile-sm{
  padding:4px 12px;background:var(--accent-dim);border:1px solid rgba(0,200,150,0.25);
  border-radius:var(--r);font-size:12px;font-weight:500;color:var(--accent);
  cursor:pointer;transition:all 0.15s;font-family:'DM Sans',sans-serif;
}
.btn-profile-sm:hover{background:rgba(0,200,150,0.15);}

/* ══════════════════════════════════════════════════════════════
   LOGIN NUDGE
══════════════════════════════════════════════════════════════ */
.login-nudge{display:flex;flex-direction:column;align-items:center;text-align:center;padding:28px 20px;gap:8px;}
.login-nudge-icon{font-size:28px;opacity:0.7}
.login-nudge-title{font-family:'Clash Display',sans-serif;font-size:16px;font-weight:600;color:var(--text);}
.login-nudge-sub{font-size:13px;color:var(--hint);max-width:300px;line-height:1.6}
.login-nudge-btn{
  margin-top:8px;padding:9px 24px;background:var(--accent);color:#0a0b0e;
  border:none;border-radius:var(--r);font-size:13.5px;font-weight:600;
  cursor:pointer;transition:all 0.15s;font-family:'DM Sans',sans-serif;
}
.login-nudge-btn:hover{background:#00e0aa;transform:translateY(-1px)}

/* ══════════════════════════════════════════════════════════════
   PROFILE PAGE
══════════════════════════════════════════════════════════════ */
.profile-page-body{display:flex;gap:24px;padding:24px;overflow-y:auto;height:calc(100vh - 52px);align-items:flex-start;}
.profile-left{width:360px;flex-shrink:0;display:flex;flex-direction:column;gap:16px;}
.profile-card{background:var(--bg2);border:1px solid var(--border2);border-radius:var(--r3);padding:24px;display:flex;align-items:center;gap:16px;}
.profile-avatar{width:64px;height:64px;border-radius:50%;background:var(--accent);color:#0a0b0e;font-family:'Clash Display',sans-serif;font-size:24px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0;}
.profile-card-info{flex:1;min-width:0;}
.profile-display-name{font-family:'Clash Display',sans-serif;font-size:18px;font-weight:700;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.profile-email{font-size:13px;color:var(--hint);margin-top:3px;word-break:break-all;}
.profile-joined{font-size:12px;color:var(--hint);margin-top:4px;font-family:var(--mono);}
.profile-section{background:var(--bg2);border:1px solid var(--border2);border-radius:var(--r3);padding:20px 24px;}
.profile-section-title{font-family:'Clash Display',sans-serif;font-size:15px;font-weight:600;color:var(--text);margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid var(--border);}
.form-textarea{resize:vertical;min-height:80px;line-height:1.6;font-family:'DM Sans',sans-serif;}
.profile-save-row{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:8px;flex-wrap:wrap;}
.profile-right{flex:1;display:flex;flex-direction:column;gap:16px;min-width:0;}
.profile-stats-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;}
.profile-stat-card{background:var(--bg2);border:1px solid var(--border2);border-radius:var(--r2);padding:16px 20px;text-align:center;}
.profile-stat-num{font-family:'Clash Display',sans-serif;font-size:28px;font-weight:700;color:var(--accent);letter-spacing:-1px;}
.profile-stat-label{font-size:12px;color:var(--hint);margin-top:4px;text-transform:uppercase;letter-spacing:0.5px;}
.profile-progress-track{height:8px;background:var(--border);border-radius:4px;overflow:hidden;margin-bottom:8px;}
.profile-progress-fill{height:100%;background:var(--accent);border-radius:4px;transition:width 0.6s ease;width:0%;}
.profile-progress-label{font-size:13px;color:var(--muted);font-family:var(--mono);}
.profile-q-filters{display:flex;gap:8px;margin-bottom:14px;}
.profile-q-filter{padding:4px 14px;border-radius:20px;background:var(--surface);border:1px solid var(--border2);font-size:12px;font-weight:500;color:var(--muted);cursor:pointer;transition:all 0.15s;font-family:'DM Sans',sans-serif;}
.profile-q-filter:hover{color:var(--text);border-color:var(--muted);}
.profile-q-filter.active{background:var(--accent);color:#0a0b0e;border-color:var(--accent);}
.profile-q-list{display:flex;flex-direction:column;gap:1px;background:var(--border);border:1px solid var(--border);border-radius:var(--r2);overflow:hidden;}
.profile-q-row{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--bg2);cursor:pointer;transition:background 0.15s;}
.profile-q-row:hover{background:var(--bg3);}
.profile-q-status{width:20px;height:20px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;flex-shrink:0;}
.profile-q-status.solved{background:var(--accent);color:#0a0b0e;}
.profile-q-status.unsolved{background:var(--surface2);border:1.5px solid var(--border2);color:transparent;}
.profile-q-num{font-family:var(--mono);font-size:11px;color:var(--hint);min-width:28px;}
.profile-q-title{font-size:13.5px;font-weight:500;flex:1;color:var(--text);}
.profile-q-tags{font-size:11px;color:var(--hint);font-family:var(--mono);}
.profile-q-solved-at{font-size:11px;color:var(--hint);font-family:var(--mono);white-space:nowrap;}
.profile-q-empty{text-align:center;padding:32px 20px;color:var(--hint);font-size:13px;background:var(--bg2);}
.profile-q-empty .es-icon{font-size:24px;margin-bottom:8px;opacity:0.4;}
.profile-links{display:flex;gap:8px;margin-top:8px;flex-wrap:wrap;}
.profile-link-btn{display:inline-flex;align-items:center;gap:5px;padding:3px 10px;border-radius:20px;background:var(--surface);border:1px solid var(--border2);font-size:11.5px;color:var(--muted);text-decoration:none;transition:all 0.15s;font-family:'DM Sans',sans-serif;}
.profile-link-btn:hover{border-color:var(--accent);color:var(--accent);}
@media(max-width:900px){
  .profile-page-body{flex-direction:column;}
  .profile-left{width:100%;}
  .profile-stats-row{grid-template-columns:repeat(2,1fr);}
}

/* ═══════════════════════════════════════════════════════════════
   LEARN PAGE
═══════════════════════════════════════════════════════════════ */

/* ── Nav ─────────────────────────────────────────────────────── */
.learn-nav {
  display: flex;
  align-items: center;
  height: 56px;
  padding: 0 24px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  gap: 16px;
}
.learn-nav-logo {
  font-family: var(--display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
  flex-shrink: 0;
}
.learn-nav-logo span { color: var(--accent); }
.learn-nav-center {
  flex: 1;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.learn-nav-right { flex-shrink: 0; }
.learn-back-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.8rem;
  padding: 6px 14px;
  border-radius: var(--r);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  font-family: var(--mono);
}
.learn-back-btn:hover { color: var(--text); border-color: var(--border2); }

/* ── Nav link highlight ──────────────────────────────────────── */
.nav-link-learn {
  color: var(--accent) !important;
  font-weight: 500;
}

/* ── Body layout ─────────────────────────────────────────────── */
.learn-body {
  display: flex;
  height: calc(100vh - 56px);
  overflow: hidden;
}

/* ── Sidebar ─────────────────────────────────────────────────── */
.learn-sidebar-wrap {
  width: 280px;
  flex-shrink: 0;
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.learn-search-wrap {
  position: relative;
  padding: 14px 16px 10px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.learn-search {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 8px 34px 8px 12px;
  color: var(--text);
  font-size: 0.82rem;
  font-family: var(--mono);
  outline: none;
  transition: border-color 0.15s;
}
.learn-search:focus { border-color: var(--accent); }
.learn-search::placeholder { color: var(--hint); }
.learn-search-icon {
  position: absolute;
  right: 28px;
  top: 50%;
  transform: translateY(-30%);
  color: var(--hint);
  font-size: 1.1rem;
  pointer-events: none;
}
.learn-sidebar {
  overflow-y: auto;
  flex: 1;
  padding: 8px 0 24px;
}

/* ── Module ──────────────────────────────────────────────────── */
.learn-module { border-bottom: 1px solid var(--border); }
.learn-module-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  cursor: pointer;
  user-select: none;
  transition: background 0.12s;
}
.learn-module-header:hover { background: var(--surface); }
.lm-icon { font-size: 1rem; flex-shrink: 0; }
.lm-info { flex: 1; min-width: 0; }
.lm-title {
  display: block;
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.lm-count {
  display: block;
  font-size: 0.72rem;
  color: var(--hint);
  margin-top: 1px;
}
.lm-chevron {
  color: var(--hint);
  font-size: 1.1rem;
  flex-shrink: 0;
  transition: transform 0.2s;
  display: inline-block;
}
.lm-chevron.open { transform: rotate(90deg); }

/* ── Topics list ─────────────────────────────────────────────── */
.learn-topics-list {
  display: none;
  padding: 2px 0 6px;
}
.learn-topics-list.open { display: block; }
.learn-topic-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 16px 7px 36px;
  cursor: pointer;
  font-size: 0.81rem;
  color: var(--muted);
  transition: background 0.1s, color 0.1s;
  border-left: 2px solid transparent;
}
.learn-topic-item:hover {
  background: var(--surface);
  color: var(--text);
}
.learn-topic-item.active {
  background: var(--accent-dim);
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 500;
}
.lt-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--hint);
  flex-shrink: 0;
  transition: background 0.1s;
}
.learn-topic-item.active .lt-dot { background: var(--accent); }
.lt-title { line-height: 1.4; }

/* ── Content area ────────────────────────────────────────────── */
.learn-content-wrap {
  flex: 1;
  overflow-y: auto;
  background: var(--bg);
}
.learn-content {
  max-width: 820px;
  margin: 0 auto;
  padding: 40px 48px 80px;
}

/* ── Breadcrumb ──────────────────────────────────────────────── */
.learn-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--hint);
  margin-bottom: 28px;
  font-family: var(--mono);
}
.lbc-mod { color: var(--muted); }
.lbc-sep { color: var(--hint); }
.lbc-topic { color: var(--accent); }

/* ── Article styles ──────────────────────────────────────────── */
.learn-article h1 {
  font-family: var(--display);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 20px;
  line-height: 1.25;
}
.learn-article h2 {
  font-family: var(--display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  margin: 32px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.learn-article h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin: 24px 0 10px;
}
.learn-article p {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.75;
  margin-bottom: 16px;
}
.learn-article ul, .learn-article ol {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.75;
  margin: 0 0 16px 20px;
}
.learn-article li { margin-bottom: 4px; }
.learn-article code {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
  font-family: var(--mono);
  font-size: 0.85em;
  color: var(--accent);
}
.learn-article pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r2);
  padding: 18px 20px;
  overflow-x: auto;
  margin: 16px 0 20px;
}
.learn-article pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.88rem;
  color: var(--text);
}
.learn-article strong { color: var(--text); font-weight: 600; }
.learn-article table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 20px;
  font-size: 0.88rem;
}
.learn-article th {
  background: var(--surface2);
  color: var(--text);
  font-weight: 600;
  padding: 10px 14px;
  text-align: left;
  border: 1px solid var(--border);
}
.learn-article td {
  padding: 9px 14px;
  border: 1px solid var(--border);
  color: var(--muted);
}
.learn-article tr:nth-child(even) td { background: var(--bg2); }

/* ── Coming soon block ───────────────────────────────────────── */
.coming-soon-block {
  margin-top: 40px;
  text-align: center;
  padding: 60px 24px;
  background: var(--surface);
  border: 1px dashed var(--border2);
  border-radius: var(--r3);
}
.cs-icon { font-size: 2.5rem; margin-bottom: 16px; }
.cs-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}
.cs-sub { font-size: 0.88rem; color: var(--hint); }

/* ── Welcome screen ──────────────────────────────────────────── */
.learn-welcome {
  text-align: center;
  padding: 100px 24px;
}
.lw-icon { font-size: 3rem; margin-bottom: 20px; }
.learn-welcome h2 {
  font-family: var(--display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
}
.learn-welcome p { color: var(--muted); font-size: 0.95rem; }

/* ── Prev / Next nav buttons ─────────────────────────────────── */
.learn-nav-btns {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.learn-nav-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r2);
  padding: 14px 20px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  max-width: 48%;
  text-align: left;
}
.learn-nav-btn:hover { border-color: var(--accent); background: var(--accent-dim); }
.learn-nav-btn.next { margin-left: auto; text-align: right; flex-direction: row-reverse; }
.lnb-arrow {
  font-size: 1.4rem;
  color: var(--accent);
  flex-shrink: 0;
}
.lnb-info { display: flex; flex-direction: column; min-width: 0; }
.lnb-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--hint);
  font-family: var(--mono);
}
.lnb-title {
  font-size: 0.85rem;
  color: var(--text);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 900px) {
  .learn-body { flex-direction: column; height: auto; overflow: visible; }
  .learn-sidebar-wrap {
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: 45vh;
    overflow-y: auto;
  }
  .learn-content-wrap { overflow-y: visible; }
  .learn-content { padding: 24px 20px 60px; }
  .learn-nav-center { display: none; }
}
@media (max-width: 600px) {
  .learn-content { padding: 20px 16px 60px; }
  .learn-article h1 { font-size: 1.4rem; }
  .learn-nav-btn { padding: 10px 14px; }
  .lnb-title { font-size: 0.78rem; }
}

/* ═══════════════════════════════════════════════════════════
   ANNOUNCEMENT BANNER
═══════════════════════════════════════════════════════════ */
.announcement-banner {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  background: linear-gradient(90deg, #1a1200 0%, #2a1e00 100%);
  border-bottom: 1px solid #f0a500;
  color: #ffd666;
  font-size: 0.88rem;
  font-weight: 500;
}
.ann-icon { font-size: 1rem; flex-shrink: 0; }
.ann-text { flex: 1; }
.ann-dismiss {
  background: none; border: none; color: #f0a500;
  font-size: 1rem; cursor: pointer; padding: 2px 6px;
  border-radius: 4px; flex-shrink: 0;
  transition: background 0.15s;
}
.ann-dismiss:hover { background: rgba(240,165,0,0.15); }

/* push pages down when banner is visible */
body:has(.announcement-banner[style*="flex"]) .page.active { padding-top: 40px; }

/* ═══════════════════════════════════════════════════════════
   ADMIN NAV LINK
═══════════════════════════════════════════════════════════ */
.nav-link-admin {
  color: #f0a500 !important;
  font-weight: 600;
  border: 1px solid rgba(240,165,0,0.3);
  border-radius: 6px;
  padding: 4px 10px !important;
  transition: background 0.15s, border-color 0.15s;
}
.nav-link-admin:hover { background: rgba(240,165,0,0.1); border-color: #f0a500; }

/* ═══════════════════════════════════════════════════════════
   ADMIN PAGE LAYOUT
═══════════════════════════════════════════════════════════ */
#admin-page { min-height: 100vh; background: #0a0b0e; }

.admin-top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 28px;
  background: #0f1014;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
}
.admin-nav-left { display: flex; align-items: center; gap: 16px; }
.admin-nav-title { font-size: 1rem; font-weight: 700; color: var(--fg); }
.btn-back-admin {
  background: none; border: 1px solid var(--border); color: var(--dim);
  padding: 6px 14px; border-radius: 8px; cursor: pointer; font-size: 0.85rem;
  transition: border-color 0.15s, color 0.15s;
}
.btn-back-admin:hover { border-color: var(--accent); color: var(--accent); }
.btn-adm-refresh {
  background: none; border: 1px solid var(--border); color: var(--dim);
  padding: 6px 14px; border-radius: 8px; cursor: pointer; font-size: 0.85rem;
  transition: border-color 0.15s, color 0.15s;
}
.btn-adm-refresh:hover { border-color: var(--accent); color: var(--accent); }

.admin-loading {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 16px; height: 60vh; color: var(--dim);
}
.admin-loading-spinner {
  width: 32px; height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.admin-body {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 28px 80px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* ── SECTIONS ─────────────────────────────────────────────────── */
.adm-section {
  background: #0f1014;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px 28px;
}
.adm-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}
.adm-section-head h2 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--fg);
  margin: 0;
}
.adm-section-desc {
  color: var(--dim);
  font-size: 0.85rem;
  margin-bottom: 14px;
  line-height: 1.5;
}

/* ── KPI CARDS ────────────────────────────────────────────────── */
.adm-kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.adm-kpi-card {
  background: #141519;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 24px;
  transition: border-color 0.2s;
}
.adm-kpi-card:hover { border-color: rgba(139,92,246,0.3); }
.adm-kpi-card.kpi-dau  { border-left: 3px solid #00c896; }
.adm-kpi-card.kpi-mau  { border-left: 3px solid #8b5cf6; }
.adm-kpi-card.kpi-eng  { border-left: 3px solid #f0a500; }
.adm-kpi-val {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--fg);
  line-height: 1;
  margin-bottom: 6px;
  font-variant-numeric: tabular-nums;
}
.adm-kpi-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.adm-kpi-sub {
  font-size: 0.75rem;
  color: #555;
  margin-top: 2px;
}

/* ── CHART ────────────────────────────────────────────────────── */
.adm-chart-wrap {
  background: #141519;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 16px 0;
}
.adm-chart {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 120px;
  padding-bottom: 28px;
}
.adm-bar-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  height: 100%;
  position: relative;
  gap: 3px;
}
.adm-bar-val {
  font-size: 0.7rem;
  color: var(--accent);
  font-weight: 700;
  min-height: 14px;
  line-height: 1;
}
.adm-bar {
  width: 100%;
  background: linear-gradient(180deg, var(--accent) 0%, rgba(139,92,246,0.4) 100%);
  border-radius: 4px 4px 0 0;
  min-height: 3px;
  transition: height 0.3s ease;
}
.adm-bar-label {
  position: absolute;
  bottom: -22px;
  font-size: 0.62rem;
  color: #555;
  white-space: nowrap;
  transform: rotate(-30deg);
  transform-origin: top center;
}

/* ── ENGAGEMENT ───────────────────────────────────────────────── */
.adm-eng-row {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.adm-eng-label {
  color: var(--dim);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.adm-eng-input {
  width: 64px;
  background: #1a1b20;
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 0.9rem;
  text-align: center;
}
.adm-eng-count {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
}
.adm-eng-pills { display: flex; flex-wrap: wrap; gap: 8px; }
.adm-eng-pill {
  background: rgba(139,92,246,0.12);
  border: 1px solid rgba(139,92,246,0.25);
  color: var(--fg);
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 0.82rem;
}
.adm-eng-pill b { color: var(--accent); }

/* ── USERS TABLE ──────────────────────────────────────────────── */
.adm-head-left  { display: flex; align-items: center; gap: 10px; }
.adm-head-right { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.adm-count-badge {
  background: rgba(139,92,246,0.15);
  color: var(--accent);
  border-radius: 20px;
  padding: 2px 10px;
  font-size: 0.78rem;
  font-weight: 600;
}
.adm-search-input {
  background: #1a1b20;
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: 8px;
  padding: 7px 14px;
  font-size: 0.85rem;
  width: 220px;
  outline: none;
  transition: border-color 0.15s;
}
.adm-search-input:focus { border-color: var(--accent); }
.btn-adm-export {
  background: none;
  border: 1px solid var(--border);
  color: var(--dim);
  padding: 7px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.82rem;
  white-space: nowrap;
  transition: border-color 0.15s, color 0.15s;
}
.btn-adm-export:hover { border-color: #00c896; color: #00c896; }

.adm-table-wrap { overflow-x: auto; margin-top: 4px; }
.adm-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
.adm-table thead th {
  text-align: left;
  padding: 10px 12px;
  color: #555;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.adm-sort-th { cursor: pointer; user-select: none; }
.adm-sort-th:hover { color: var(--accent); }
.adm-table tbody td {
  padding: 12px 12px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  color: var(--fg);
  vertical-align: middle;
}
.adm-user-row { cursor: pointer; transition: background 0.12s; }
.adm-user-row:hover { background: rgba(255,255,255,0.03); }
.adm-user-row.adm-row-open { background: rgba(139,92,246,0.05); }
.adm-detail-row td { padding: 0 !important; border-bottom: 1px solid rgba(139,92,246,0.2) !important; }
.adm-detail-inner {
  padding: 14px 56px;
  background: rgba(139,92,246,0.04);
}
.adm-detail-pills { display: flex; flex-wrap: wrap; gap: 8px; }
.adm-avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg,#8b5cf6,#6d28d9);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.7rem; font-weight: 700; color: #fff;
}
.adm-user-name { font-weight: 600; }
.adm-badge-admin {
  display: inline-block;
  background: rgba(240,165,0,0.15);
  color: #f0a500;
  border: 1px solid rgba(240,165,0,0.3);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 0.68rem;
  font-weight: 700;
  margin-left: 4px;
  vertical-align: middle;
  text-transform: uppercase;
}
.adm-dim { color: var(--dim); font-size: 0.82rem; }
.adm-solve-badge {
  display: inline-block;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 10px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--dim);
}
.adm-solve-badge.has-solves { background: rgba(0,200,150,0.1); border-color: rgba(0,200,150,0.3); color: #00c896; }
.adm-chevron { color: #444; font-size: 0.7rem; }
.adm-solved-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 0.78rem;
  color: var(--fg);
}
.adm-solved-pill.diff-easy   { border-color: rgba(0,200,150,0.3); }
.adm-solved-pill.diff-medium { border-color: rgba(240,165,0,0.3); }
.adm-solved-pill.diff-hard   { border-color: rgba(239,68,68,0.3); }
.pill-date { color: var(--dim); font-size: 0.72rem; }
.adm-empty-row { text-align: center; color: var(--dim); padding: 2rem !important; }
.adm-no-data { color: var(--dim); font-size: 0.85rem; }

/* ── QUESTION ANALYTICS ───────────────────────────────────────── */
.adm-q-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.adm-q-panel h3 {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--dim);
  margin-bottom: 14px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 8px;
}
.adm-warn-badge {
  background: rgba(239,68,68,0.12);
  color: #ef4444;
  border: 1px solid rgba(239,68,68,0.25);
  border-radius: 6px;
  padding: 2px 7px;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
}
.adm-q-row { margin-bottom: 10px; }
.adm-q-title {
  font-size: 0.82rem;
  color: var(--fg);
  margin-bottom: 5px;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.adm-q-bar-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}
.adm-q-bar {
  height: 6px;
  background: linear-gradient(90deg, var(--accent), rgba(139,92,246,0.4));
  border-radius: 3px;
  transition: width 0.3s ease;
  min-width: 4px;
}
.adm-q-count {
  font-size: 0.75rem;
  color: var(--dim);
  white-space: nowrap;
}
.adm-zero-pill {
  display: inline-block;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 10px;
  font-size: 0.78rem;
  color: var(--dim);
  margin: 4px 4px 0 0;
}
.adm-zero-pill.diff-easy   { border-color: rgba(0,200,150,0.25); color: #00c896; }
.adm-zero-pill.diff-medium { border-color: rgba(240,165,0,0.25); color: #f0a500; }
.adm-zero-pill.diff-hard   { border-color: rgba(239,68,68,0.25); color: #ef4444; }
.adm-ok-msg { color: #00c896; font-size: 0.85rem; }

/* ── ANNOUNCEMENT SECTION ─────────────────────────────────────── */
.adm-ann-textarea {
  width: 100%;
  background: #141519;
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 0.9rem;
  font-family: inherit;
  resize: vertical;
  outline: none;
  transition: border-color 0.15s;
  line-height: 1.5;
}
.adm-ann-textarea:focus { border-color: var(--accent); }
.adm-ann-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
}
.btn-adm-publish {
  background: var(--accent);
  border: none;
  color: #fff;
  padding: 8px 20px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  transition: opacity 0.15s;
}
.btn-adm-publish:hover    { opacity: 0.85; }
.btn-adm-publish:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-adm-clear {
  background: none;
  border: 1px solid var(--border);
  color: var(--dim);
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: border-color 0.15s, color 0.15s;
}
.btn-adm-clear:hover { border-color: #ef4444; color: #ef4444; }
.adm-ann-status { font-size: 0.82rem; color: #00c896; font-weight: 600; }

/* ── DIFF BADGES (reused in admin) ───────────────────────────── */
.diff-badge {
  display: inline-block;
  padding: 1px 7px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
}
.diff-badge.diff-easy   { background: rgba(0,200,150,0.12); color: #00c896; }
.diff-badge.diff-medium { background: rgba(240,165,0,0.12);  color: #f0a500; }
.diff-badge.diff-hard   { background: rgba(239,68,68,0.12);  color: #ef4444; }

/* ── ADMIN RESPONSIVE ─────────────────────────────────────────── */
@media (max-width: 900px) {
  .adm-kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .adm-q-grid   { grid-template-columns: 1fr; }
  .admin-body   { padding: 20px 16px 60px; }
  .adm-section  { padding: 18px 16px; }
}
@media (max-width: 600px) {
  .adm-kpi-grid    { grid-template-columns: 1fr 1fr; }
  .adm-head-right  { width: 100%; }
  .adm-search-input{ width: 100%; }
  .adm-kpi-val     { font-size: 1.7rem; }
  .admin-top-nav   { padding: 12px 16px; }
}

/* ================================================================
   CERTIFICATION FLOW
   ================================================================ */

/* -- Modal overlay ----------------------------------------------- */
.cert-modal {
  position: fixed; inset: 0; z-index: 2000;
  background: rgba(0,0,0,0.82);
  backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center;
  padding: 16px;
  animation: certFadeIn 0.2s ease;
}
@keyframes certFadeIn { from { opacity:0; } to { opacity:1; } }

.cert-modal-box {
  background: #13141c;
  border: 1px solid rgba(139,92,246,0.3);
  border-radius: 18px;
  width: 100%; max-width: 640px;
  max-height: 92vh; overflow-y: auto;
  padding: 36px 40px;
  position: relative;
  scrollbar-width: thin;
  scrollbar-color: #8b5cf6 transparent;
  animation: certSlideUp 0.25s ease;
}
@keyframes certSlideUp { from { transform: translateY(24px); opacity:0; } to { transform: translateY(0); opacity:1; } }

.cert-close-btn {
  position: absolute; top: 16px; right: 18px;
  background: none; border: none;
  color: #6b7280; font-size: 18px; cursor: pointer;
  padding: 4px 8px; border-radius: 6px; line-height:1;
  transition: color 0.15s, background 0.15s;
}
.cert-close-btn:hover { color: #e8e6e0; background: rgba(255,255,255,0.07); }

/* -- Screens ----------------------------------------------------- */
.cert-screen { display: none; animation: certFadeIn 0.18s ease; }
.cert-screen.active { display: block; }

/* -- Step progress ----------------------------------------------- */
.cert-progress-steps {
  display: flex; align-items: center; justify-content: center;
  gap: 0; margin-bottom: 28px;
}
.cert-prog-step {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  font-size: 11px; color: #6b7280; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.04em;
  min-width: 80px;
}
.cert-prog-dot {
  width: 28px; height: 28px; border-radius: 50%;
  background: #1e1f2a; border: 2px solid #374151;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; color: #6b7280;
  transition: all 0.2s;
}
.cert-prog-step.active .cert-prog-dot { background: #8b5cf6; border-color: #8b5cf6; color: #fff; }
.cert-prog-step.done   .cert-prog-dot { background: #16a34a; border-color: #16a34a; color: #fff; }
.cert-prog-step.active span { color: #c4b5fd; }
.cert-prog-step.done   span { color: #4ade80; }
.cert-prog-line { flex: 1; height: 2px; background: #374151; min-width: 32px; }

/* -- Shared typography ------------------------------------------- */
.cert-h2  { font-size: 1.55rem; font-weight: 800; color: #f9f8f5; margin: 0 0 10px; text-align: center; }
.cert-sub { font-size: 0.9rem; color: #9ca3af; text-align: center; line-height: 1.6; margin: 0 0 24px; }
.cert-sub strong { color: #c4b5fd; }

/* -- Hub screen -------------------------------------------------- */
.cert-hero-icon { font-size: 3.5rem; text-align: center; margin-bottom: 12px; }
.cert-info-row  { display: flex; gap: 12px; justify-content: center; margin: 20px 0; }
.cert-info-card {
  background: #1a1b26; border: 1px solid rgba(139,92,246,0.2);
  border-radius: 12px; padding: 16px 24px;
  text-align: center; flex: 1; max-width: 140px;
}
.cert-info-big   { font-size: 1.5rem; font-weight: 800; color: #a78bfa; }
.cert-info-small { font-size: 0.75rem; color: #6b7280; margin-top: 4px; }
.cert-topics-note {
  font-size: 0.8rem; color: #6b7280; text-align: center;
  background: #1a1b26; border-radius: 8px; padding: 10px 16px;
  margin: 0 0 12px; line-height: 1.6;
}
.cert-topics-note strong { color: #9ca3af; }
.cert-warn-note {
  font-size: 0.78rem; color: #f59e0b; text-align: center;
  margin: 0 0 20px; opacity: 0.85;
}

/* -- Buttons ----------------------------------------------------- */
.cert-btn-primary {
  display: block; width: 100%;
  background: linear-gradient(135deg, #7c3aed, #8b5cf6);
  color: #fff; border: none; border-radius: 10px;
  font-size: 0.92rem; font-weight: 700; cursor: pointer;
  padding: 13px 20px; text-align: center;
  transition: opacity 0.15s, transform 0.1s;
}
.cert-btn-primary:hover:not(:disabled) { opacity: 0.92; transform: translateY(-1px); }
.cert-btn-primary:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }
.cert-btn-primary.cert-btn-big { padding: 15px 20px; font-size: 1rem; }

.cert-btn-secondary {
  display: block; width: 100%;
  background: transparent; color: #9ca3af;
  border: 1px solid #374151; border-radius: 10px;
  font-size: 0.9rem; font-weight: 600; cursor: pointer;
  padding: 12px 20px; text-align: center;
  transition: color 0.15s, border-color 0.15s;
}
.cert-btn-secondary:hover { color: #e8e6e0; border-color: #6b7280; }

.cert-btn-small {
  background: transparent; border: 1px solid #8b5cf6;
  color: #a78bfa; border-radius: 8px; padding: 7px 16px;
  font-size: 0.8rem; font-weight: 600; cursor: pointer;
  transition: background 0.15s;
}
.cert-btn-small:hover { background: rgba(139,92,246,0.12); }

.cert-btn-claim {
  background: linear-gradient(135deg, #7c3aed, #8b5cf6);
  color: #fff; border: none; border-radius: 10px;
  padding: 11px 22px; font-size: 0.88rem; font-weight: 700;
  cursor: pointer; white-space: nowrap;
  transition: opacity 0.15s, transform 0.1s;
}
.cert-btn-claim:hover { opacity: 0.9; transform: translateY(-1px); }

/* -- Test screen ------------------------------------------------- */
.cert-test-topbar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 10px;
}
.cert-q-counter   { font-size: 0.82rem; color: #6b7280; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; }
.cert-timer-wrap  { display: flex; align-items: center; gap: 6px; }
.cert-timer-icon  { font-size: 14px; }
.cert-timer-val   {
  font-size: 1rem; font-weight: 800; color: #a78bfa;
  font-variant-numeric: tabular-nums;
  transition: color 0.3s;
}
.cert-timer-val.cert-timer-warn { color: #ef4444; animation: certTimerPulse 1s infinite; }
@keyframes certTimerPulse { 0%,100%{opacity:1} 50%{opacity:0.6} }

.cert-timer-track { height: 4px; background: #1e1f2a; border-radius: 4px; margin-bottom: 24px; overflow: hidden; }
.cert-timer-fill  {
  height: 100%; border-radius: 4px;
  background: linear-gradient(90deg, #8b5cf6, #a78bfa);
  width: 100%; transition: width 1s linear, background 0.5s;
}
.cert-timer-fill.cert-timer-fill-warn { background: linear-gradient(90deg, #ef4444, #f87171); }

.cert-q-text {
  font-size: 1.05rem; font-weight: 600; color: #e8e6e0;
  line-height: 1.55; margin-bottom: 20px;
  background: #1a1b26; border-radius: 10px; padding: 18px 20px;
  border-left: 3px solid #8b5cf6;
}
.cert-options-list { display: flex; flex-direction: column; gap: 10px; margin-bottom: 24px; }
.cert-option {
  display: flex; align-items: flex-start; gap: 14px;
  background: #1a1b26; border: 1.5px solid #2d2e3a;
  border-radius: 10px; padding: 14px 16px; cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.cert-option:hover    { border-color: #8b5cf6; background: rgba(139,92,246,0.06); }
.cert-option.selected { border-color: #8b5cf6; background: rgba(139,92,246,0.12); }
.cert-opt-letter {
  width: 24px; height: 24px; border-radius: 6px;
  background: #2d2e3a; color: #9ca3af;
  font-size: 11px; font-weight: 700; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.15s, color 0.15s;
}
.cert-option.selected .cert-opt-letter { background: #8b5cf6; color: #fff; }
.cert-opt-text { font-size: 0.88rem; color: #d1d5db; line-height: 1.5; }

/* -- Score badge ------------------------------------------------- */
.cert-score-badge {
  font-size: 2.2rem; font-weight: 800;
  padding: 10px 32px; border-radius: 12px;
  margin: 0 auto 20px;
  display: flex; align-items: center; justify-content: center;
  width: fit-content;
}
.cert-score-badge.pass { background: rgba(22,163,74,0.12); color: #4ade80; border: 1px solid rgba(74,222,128,0.2); }
.cert-score-badge.fail { background: rgba(239,68,68,0.1);  color: #f87171; border: 1px solid rgba(248,113,113,0.2); }

/* -- Fail screen ------------------------------------------------- */
.cert-weak-wrap    { margin: 0 0 16px; }
.cert-weak-label   { font-size: 0.8rem; color: #9ca3af; margin-bottom: 8px; }
.cert-weak-pill    {
  display: inline-block; background: rgba(239,68,68,0.1);
  color: #f87171; border: 1px solid rgba(248,113,113,0.2);
  border-radius: 20px; padding: 4px 12px; font-size: 0.78rem;
  margin: 3px 4px 3px 0;
}
.cert-cooldown-msg { font-size: 0.85rem; color: #9ca3af; text-align: center; }
.cert-cooldown-msg strong { color: #e8e6e0; }
.cert-timeout-note { color: #f59e0b; font-size: 0.82rem; text-align: center; }

/* -- Feedback screen --------------------------------------------- */
.cert-form   { display: flex; flex-direction: column; gap: 10px; margin-bottom: 20px; }
.cert-label  { font-size: 0.82rem; font-weight: 600; color: #9ca3af; }
.cert-stars  { display: flex; gap: 6px; margin: 2px 0 6px; }
.cert-star   { font-size: 2rem; color: #374151; cursor: pointer; transition: color 0.1s, transform 0.1s; line-height:1; }
.cert-star.lit   { color: #f59e0b; }
.cert-star:hover { transform: scale(1.15); }
.cert-textarea {
  background: #1a1b26; border: 1px solid #2d2e3a; border-radius: 8px;
  color: #e8e6e0; font-size: 0.88rem; padding: 10px 12px;
  font-family: inherit; resize: vertical; outline: none;
  transition: border-color 0.15s;
}
.cert-textarea:focus { border-color: #8b5cf6; }
.cert-input {
  background: #1a1b26; border: 1px solid #2d2e3a; border-radius: 8px;
  color: #e8e6e0; font-size: 0.88rem; padding: 10px 12px;
  font-family: inherit; outline: none; transition: border-color 0.15s;
}
.cert-input:focus { border-color: #8b5cf6; }
.cert-status-line { font-size: 0.82rem; color: #ef4444; text-align: center; margin-top: 8px; min-height: 18px; }

/* -- Success / View screens -------------------------------------- */
.cert-canvas-preview {
  display: block; width: 100%; max-width: 560px;
  border-radius: 10px; border: 1px solid rgba(139,92,246,0.25);
  margin: 16px auto;
}
.cert-success-btns {
  display: flex; gap: 10px; justify-content: center;
  flex-wrap: wrap; margin-top: 4px;
}
.cert-success-btns .cert-btn-primary   { flex: 1; min-width: 180px; max-width: 240px; }
.cert-success-btns .cert-btn-secondary { flex: 1; min-width: 140px; max-width: 200px; }
.cert-profile-note { font-size: 0.8rem; color: #6b7280; text-align: center; margin-top: 12px; }
.cert-profile-note strong { color: #4ade80; }

/* -- Profile page cert block ------------------------------------- */
.cert-profile-certified {
  background: linear-gradient(135deg, rgba(139,92,246,0.08), rgba(167,139,250,0.04));
  border: 1px solid rgba(139,92,246,0.25); border-radius: 12px;
  padding: 18px 20px; margin-bottom: 20px;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 12px;
}
.cert-profile-badge { font-size: 1rem; font-weight: 700; color: #a78bfa; }
.cert-profile-date  { font-size: 0.78rem; color: #6b7280; margin: 4px 0 0; }

.cert-profile-eligible {
  background: linear-gradient(135deg, rgba(139,92,246,0.1), rgba(124,58,237,0.06));
  border: 1.5px solid rgba(139,92,246,0.35); border-radius: 12px;
  padding: 18px 20px; margin-bottom: 20px;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 14px;
  animation: certGlow 3s ease-in-out infinite;
}
@keyframes certGlow {
  0%,100% { box-shadow: 0 0 0 0 rgba(139,92,246,0); }
  50%      { box-shadow: 0 0 18px 2px rgba(139,92,246,0.18); }
}
.cert-profile-eligible-text { display: flex; align-items: flex-start; gap: 12px; flex: 1; }
.cert-fire { font-size: 1.8rem; flex-shrink: 0; }
.cert-profile-eligible-text strong { color: #e8e6e0; font-size: 0.95rem; display: block; }
.cert-profile-eligible-text p { font-size: 0.82rem; color: #9ca3af; margin: 4px 0 0; }

/* -- Responsive -------------------------------------------------- */
@media (max-width: 600px) {
  .cert-modal-box   { padding: 24px 20px; }
  .cert-info-row    { gap: 8px; }
  .cert-info-card   { padding: 12px 12px; }
  .cert-info-big    { font-size: 1.25rem; }
  .cert-h2          { font-size: 1.3rem; }
  .cert-q-text      { font-size: 0.95rem; }
  .cert-score-badge { font-size: 1.7rem; }
  .cert-profile-certified,
  .cert-profile-eligible { flex-direction: column; align-items: flex-start; }
}