*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--fg);
  font:15px/1.65 var(--font);
  -webkit-font-smoothing:antialiased;
  display:flex;min-height:100vh;flex-direction:column;
}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
img{max-width:100%;display:block}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.shell{width:min(1160px, calc(100% - 32px));margin:0 auto}
@media(min-width:768px){.shell{width:min(1160px, calc(100% - 48px))}}
/* topbar */
.topbar{
  position:sticky;top:0;z-index:40;
  background:color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.topbar-inner{min-height:64px;display:flex;align-items:center;gap:20px}
.brand{display:inline-flex;align-items:center;gap:11px;flex:none}
.brand-mark{width:40px;height:40px;display:grid;place-items:center;border-radius:11px;overflow:hidden;background:var(--primary);color:var(--primary-fg);flex:none}
.brand-mark img{width:100%;height:100%;object-fit:cover}
.brand-text strong{display:block;font-size:15.5px;letter-spacing:-.03em;line-height:1}
.brand-text small{display:block;color:var(--muted);font-size:10px;letter-spacing:.14em;text-transform:uppercase;font-weight:700;margin-top:3px}
.nav-desktop{display:flex;align-items:center;gap:2px;margin-left:10px}
.nav-link{padding:7px 12px;border-radius:9px;color:var(--muted);font-size:13.5px;font-weight:600;transition:.15s}
.nav-link:hover{color:var(--fg);background:var(--card-2)}
.nav-link.active{color:var(--primary-fg);background:var(--primary)}
.header-actions{margin-left:auto;display:flex;align-items:center;gap:8px}
.icon-btn{width:38px;height:38px;display:grid;place-items:center;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--fg);transition:.15s}
.icon-btn:hover{border-color:var(--accent);background:var(--accent-soft)}
.icon-btn svg{width:18px;height:18px}
.menu-btn{display:none}
.mobile-nav{display:none;border-top:1px solid var(--line);background:var(--bg);padding:6px 0 10px}
.mobile-nav.open{display:block}
.mobile-nav a{display:block;padding:12px 16px;font-weight:600;border-radius:10px;margin:2px 12px}
.mobile-nav a.active{background:var(--primary);color:var(--primary-fg)}
@media(max-width:900px){
  .nav-desktop{display:none}
  .menu-btn{display:grid}
}
/* bottom nav mobile */
.bottom-nav{
  position:fixed;left:0;right:0;bottom:0;z-index:38;
  display:none;align-items:center;justify-content:space-around;
  background:color-mix(in srgb, var(--bg) 96%, transparent);
  backdrop-filter:blur(16px);
  border-top:1px solid var(--line);
  padding:6px 0 max(6px, env(safe-area-inset-bottom));
}
.bottom-nav a{
  flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;
  padding:6px 4px;color:var(--muted);font-size:10.5px;font-weight:700;letter-spacing:.02em;
}
.bottom-nav a.active{color:var(--primary)}
.bottom-nav a svg{width:22px;height:22px}
@media(max-width:760px){
  .bottom-nav{display:flex}
  body{padding-bottom:72px}
}
/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 18px;border-radius:11px;border:1.5px solid var(--line);background:var(--card);color:var(--fg);font-size:14px;font-weight:650;transition:.15s;line-height:1}
.btn:hover{transform:translateY(-1px);border-color:var(--line-strong);box-shadow:var(--shadow)}
.btn:active{transform:none}
.btn-primary{background:var(--primary);color:var(--primary-fg);border-color:var(--primary)}
.btn-primary:hover{background:var(--primary-soft);border-color:var(--primary-soft)}
.btn-accent{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn-ghost{border:0;background:transparent;padding:6px 0;min-height:auto;text-decoration:underline;text-underline-offset:3px}
.btn-sm{min-height:36px;padding:7px 14px;font-size:13px;border-radius:9px}
.btn-lg{min-height:50px;padding:12px 22px;font-size:15px;border-radius:12px}
.btn:disabled{opacity:.55;pointer-events:none}
/* badges */
.badge{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;border:1px solid var(--line);background:var(--card-2);font-size:11px;font-weight:700;letter-spacing:.04em}
.badge-success{border-color:var(--success-line);background:var(--success-soft);color:var(--success)}
.badge-warn{border-color:#fde68a;background:var(--warning-soft);color:var(--warning)}
.badge-danger{border-color:#fecdd3;background:var(--danger-soft);color:var(--danger)}
.badge-primary{background:var(--primary);color:var(--primary-fg);border-color:var(--primary)}
/* eyebrow */
.eyebrow{display:inline-flex;align-items:center;gap:9px;color:var(--muted);font-size:11px;font-weight:800;letter-spacing:.15em;text-transform:uppercase}
.eyebrow::before{content:"";width:20px;height:2px;background:var(--accent);border-radius:99px}
/* cards */
.card{padding:20px;border:1px solid var(--line);border-radius:var(--radius);background:var(--card);transition:.15s}
.card-hover:hover{border-color:var(--line-strong);transform:translateY(-2px);box-shadow:var(--shadow)}
.card-muted{background:var(--card-2)}
.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
@media(max-width:640px){.stat-grid{grid-template-columns:1fr}}
.stat{padding:18px;border:1px solid var(--line);border-radius:14px;background:var(--card)}
.stat strong{display:block;font-size:28px;letter-spacing:-.04em;line-height:1}
.stat span{color:var(--muted);font-size:12px;font-weight:600}
.progress{height:8px;border-radius:99px;background:var(--bg-soft);border:1px solid var(--line);overflow:hidden}
.progress i{display:block;height:100%;background:linear-gradient(90deg, var(--accent), var(--accent-2));transition:width .35s ease}
.progress-sm{height:6px}
/* hero */
.hero{padding:48px 0 32px;border-bottom:1px solid var(--line);background: radial-gradient(1200px 600px at 20% -10%, color-mix(in srgb, var(--accent) 8%, transparent), transparent 60%), radial-gradient(900px 500px at 90% 0%, color-mix(in srgb, var(--accent-2) 7%, transparent), transparent 55%)}
@media(min-width:900px){.hero{padding:64px 0 48px}}
.hero-grid{display:grid;gap:28px;align-items:center}
@media(min-width:900px){.hero-grid{grid-template-columns:1.15fr .85fr}}
.hero h1{font-size:clamp(32px, 5.2vw, 54px);line-height:.95;letter-spacing:-.05em;font-weight:800}
.hero h1 em{font-family:var(--serif);font-style:italic;font-weight:500;letter-spacing:-.03em}
.hero-sub{max-width:560px;margin-top:14px;color:var(--muted);font-size:16px;line-height:1.6}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.hero-meta{display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:20px;color:var(--muted);font-size:12.5px;font-weight:600}
.hero-meta span{display:inline-flex;align-items:center;gap:6px}
.hero-meta i{width:6px;height:6px;background:var(--fg);border-radius:1px;display:inline-block}
.hero-visual{position:relative;border:1px solid var(--line);border-radius:var(--radius-xl);background:var(--card);padding:18px;box-shadow:var(--shadow-lg);overflow:hidden}
.hero-visual::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg, transparent 60%, color-mix(in srgb, var(--accent) 6%, transparent));pointer-events:none}
.loop{display:grid;gap:8px}
.loop-step{display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:var(--card-2);font-size:13px;font-weight:600}
.loop-step b{width:28px;height:28px;display:grid;place-items:center;border-radius:9px;background:var(--primary);color:var(--primary-fg);font-size:12px;flex:none}
.loop-step small{color:var(--muted);font-weight:500;margin-left:auto;font-size:11px}
.loop-step.active{border-color:var(--primary);background:var(--card);box-shadow:var(--shadow)}
/* sections */
.section{padding:36px 0 12px}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin-bottom:18px;flex-wrap:wrap}
.section-head h2{font-size:clamp(22px, 3vw, 30px);letter-spacing:-.04em}
.section-head p{max-width:420px;color:var(--muted);font-size:13.5px}
.section-head a{font-size:13px;font-weight:700;text-decoration:underline;text-underline-offset:3px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.grid-5{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
@media(max-width:860px){.grid-3,.grid-4,.grid-5{grid-template-columns:repeat(2,1fr)}}
@media(max-width:540px){.grid-2,.grid-3,.grid-4,.grid-5{grid-template-columns:1fr}}
/* class cards */
.class-card{position:relative;display:flex;flex-direction:column;min-height:190px;padding:22px;border:1.5px solid var(--line-strong);border-radius:18px;background:var(--card);overflow:hidden;transition:.18s}
.class-card:hover{background:var(--primary);color:var(--primary-fg);border-color:var(--primary);box-shadow:var(--shadow-lg)}
.class-card .kicker{font-size:11px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.class-card:hover .kicker{color:inherit;opacity:.7}
.class-card h3{font-size:26px;margin-top:10px}
.class-card p{margin-top:6px;font-size:12.5px;color:var(--muted)}
.class-card:hover p{color:inherit;opacity:.75}
.class-card .btn{margin-top:auto;align-self:flex-start;background:var(--card);color:var(--fg)}
.class-card:hover .btn{background:var(--primary-fg);color:var(--primary);border-color:var(--primary-fg)}
.class-card::after{content:attr(data-grade);position:absolute;right:8px;bottom:-18px;font:800 128px/1 var(--font);letter-spacing:-.1em;color:transparent;-webkit-text-stroke:1px color-mix(in srgb, var(--fg) 12%, transparent)}
.class-card:hover::after{-webkit-text-stroke:1px rgba(255,255,255,.22)}
/* subject cards */
.subject-card{display:flex;flex-direction:column;gap:8px;padding:18px;border:1px solid var(--line);border-radius:14px;background:var(--card);transition:.15s;position:relative}
.subject-card:hover{border-color:var(--accent);background:var(--accent-soft);transform:translateY(-1px);box-shadow:var(--shadow)}
.subject-card .icon{font-family:var(--serif);font-size:22px;font-weight:700;line-height:1}
.subject-card h3{font-size:15px;letter-spacing:-.02em}
.subject-card p{color:var(--muted);font-size:12.5px;line-height:1.5}
.subject-meta{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:11px;font-weight:700;margin-top:4px}
.subject-meta i{width:4px;height:4px;background:var(--fg);display:inline-block}
.strip-card{padding:16px;border:1px solid var(--line);border-radius:14px;background:var(--card-2);transition:.15s}
.strip-card:hover{border-color:var(--fg);background:var(--card)}
.strip-card strong{font-size:14px}
.strip-card small{color:var(--muted);font-size:11.5px}
/* actions grid */
.action-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
@media(max-width:860px){.action-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.action-grid{grid-template-columns:1fr}}
.action-card{display:flex;align-items:center;gap:14px;padding:16px;border:1px solid var(--line);border-radius:14px;background:var(--card);transition:.15s;text-align:left}
.action-card:hover{border-color:var(--primary);box-shadow:var(--shadow);transform:translateY(-1px)}
.action-card .ico{width:44px;height:44px;display:grid;place-items:center;border-radius:11px;background:var(--bg-soft);border:1px solid var(--line);font-size:20px;flex:none}
.action-card b{display:block;font-size:14px}
.action-card span{display:block;color:var(--muted);font-size:12px}
/* study layout */
.page{padding:22px 0 48px}
.breadcrumbs{display:flex;align-items:center;flex-wrap:wrap;gap:8px;color:var(--muted);font-size:12px;font-weight:600;margin-bottom:16px}
.breadcrumbs a:hover{color:var(--fg);text-decoration:underline}
.breadcrumbs .current{color:var(--fg)}
.page-title{font-size:clamp(26px, 4vw, 40px);letter-spacing:-.04em;line-height:1.05}
.page-intro{max-width:640px;color:var(--muted);font-size:14px;margin-top:8px}
.detail-grid{display:grid;grid-template-columns:minmax(0,1.45fr) 320px;gap:18px;align-items:start;margin-top:20px}
@media(max-width:900px){.detail-grid{grid-template-columns:1fr}}
.panel{padding:18px;border:1px solid var(--line);border-radius:16px;background:var(--card)}
.panel-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}
.panel-head h2{font-size:16px}
.panel-head span{color:var(--muted);font-size:11.5px;font-weight:600}
.chapter-list{display:grid;gap:8px}
.chapter{border:1px solid var(--line);border-radius:12px;background:var(--card-2);overflow:hidden}
.chapter.open{border-color:var(--line-strong);background:var(--card)}
.chapter-row{width:100%;display:grid;grid-template-columns:32px 1fr auto;gap:10px;align-items:center;padding:11px 12px;border:0;background:transparent;text-align:left}
.chapter-check{width:22px;height:22px;display:grid;place-items:center;border:1.5px solid var(--muted);border-radius:7px;background:var(--card);font-size:12px}
.chapter.done .chapter-check{background:var(--success);border-color:var(--success);color:#fff}
.chapter-num{font-family:var(--serif);font-size:12px;color:var(--muted);text-align:center}
.chapter-title{font-size:13.5px;font-weight:650}
.chapter-arrow{color:var(--muted);transition:transform .15s}
.chapter.open .chapter-arrow{transform:rotate(45deg)}
.chapter-body{display:none;padding:0 14px 14px 54px}
.chapter.open .chapter-body{display:block}
.keypoint{padding:9px 11px;margin-top:7px;border:1px dashed var(--line);border-radius:9px;background:var(--card);color:var(--muted);font-size:12.5px}
.keypoint b{color:var(--fg);font-family:var(--serif)}
/* topic status */
.topic-row{display:flex;align-items:center;gap:10px;padding:10px 12px;border:1px solid var(--line);border-radius:11px;background:var(--card-2)}
.topic-row strong{font-size:13.5px}
.topic-row .status{margin-left:auto;display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:800;padding:4px 9px;border-radius:999px;border:1px solid var(--line)}
.status-strong{border-color:var(--success-line);background:var(--success-soft);color:var(--success)}
.status-improving{border-color:#fde68a;background:var(--warning-soft);color:var(--warning)}
.status-needs{border-color:#fecdd3;background:var(--danger-soft);color:var(--danger)}
.status-not{border-color:var(--line);background:var(--card);color:var(--muted)}
/* practice */
.filters{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}
.filter{padding:7px 12px;border:1px solid var(--line);border-radius:999px;background:var(--card);font-size:12.5px;font-weight:600}
.filter.active{background:var(--primary);color:var(--primary-fg);border-color:var(--primary)}
.question-card{border:1px solid var(--line);border-radius:14px;background:var(--card);padding:18px;margin-bottom:12px}
.question-card.correct{border-color:var(--success-line);background:var(--success-soft)}
.question-card.wrong{border-color:#fecdd3;background:var(--danger-soft)}
.q-top{display:flex;gap:10px;align-items:flex-start}
.q-num{width:28px;height:28px;display:grid;place-items:center;border:1.5px solid var(--line-strong);border-radius:8px;font-size:12px;font-weight:800;flex:none}
.q-text{flex:1;font-size:14.5px;line-height:1.5}
.q-marks{flex:none;padding:3px 8px;border:1px solid var(--line);border-radius:999px;font-size:11px;font-weight:700;color:var(--muted);background:var(--card-2)}
.q-opts{display:grid;gap:8px;margin-top:14px}
.q-opt{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;border:1.5px solid var(--line);border-radius:11px;cursor:pointer;transition:.12s;background:var(--card);font-size:13.5px}
.q-opt:hover{border-color:var(--fg)}
.q-opt.selected{border-color:var(--primary);background:var(--card-2)}
.q-opt.correct{border-color:var(--success);background:var(--success-soft)}
.q-opt.wrong{border-color:var(--danger);background:var(--danger-soft)}
.q-opt input{margin-top:3px;accent-color:var(--primary)}
.q-feedback{margin-top:12px;padding:11px 13px;border-left:3px solid var(--primary);border-radius:0 10px 10px 0;background:var(--card-2);font-size:13px;display:none}
.q-feedback.show{display:block}
.q-feedback b{display:block;font-size:11px;letter-spacing:.08em;text-transform:uppercase;margin-bottom:4px}
/* paper */
.paper-toolbar{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-bottom:18px}
.paper-sheet{max-width:860px;margin:0 auto;border:1.5px solid var(--line-strong);border-radius:18px;background:var(--card);padding:28px 24px}
@media(min-width:640px){.paper-sheet{padding:34px 38px}}
.paper-head{text-align:center;border-bottom:2px solid var(--line-strong);padding-bottom:18px;margin-bottom:22px}
.paper-head .brandline{font-size:11px;font-weight:800;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}
.paper-head h1{font-size:clamp(20px,3.2vw,28px);margin:8px 0 6px}
.paper-meta-row{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-top:14px}
.paper-meta{padding:5px 12px;border:1px solid var(--line-strong);border-radius:999px;font-size:11px;font-weight:800}
.score-banner{max-width:860px;margin:0 auto 16px;display:none;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:14px 18px;border:1.5px solid var(--line-strong);border-radius:13px;background:var(--card-2)}
.score-banner.show{display:flex}
.score-banner strong{font-size:20px}
/* revision */
.rev-step{padding:18px;border:1px solid var(--line);border-radius:14px;background:var(--card);margin-bottom:12px}
.rev-step h3{font-size:15px;margin-bottom:4px}
.rev-step .hint{color:var(--muted);font-size:12.5px;margin-bottom:12px}
.choice-grid{display:grid;gap:10px}
.choice-grid.cols-2{grid-template-columns:repeat(2,1fr)}
.choice-grid.cols-5{grid-template-columns:repeat(5,1fr)}
@media(max-width:860px){.choice-grid.cols-5{grid-template-columns:repeat(2,1fr)}}
@media(max-width:540px){.choice-grid.cols-2,.choice-grid.cols-5{grid-template-columns:1fr}}
.choice{position:relative;display:flex;flex-direction:column;gap:4px;padding:14px;border:1.5px solid var(--line);border-radius:12px;background:var(--card);text-align:left;transition:.12s}
.choice:hover{border-color:var(--fg)}
.choice.selected{border-color:var(--primary);background:var(--primary);color:var(--primary-fg)}
.choice .tag{font-size:10.5px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.choice.selected .tag{color:inherit;opacity:.7}
.choice strong{font-size:13.5px}
.choice small{color:var(--muted);font-size:11.5px}
.choice.selected small{color:inherit;opacity:.75}
.chips{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
@media(max-width:700px){.chips{grid-template-columns:repeat(2,1fr)}}
@media(max-width:420px){.chips{grid-template-columns:1fr}}
.chip{display:flex;align-items:center;gap:8px;padding:10px 11px;border:1.5px solid var(--line);border-radius:11px;background:var(--card);text-align:left;font-size:12.5px;font-weight:600}
.chip.selected{border-color:var(--primary);background:var(--primary);color:var(--primary-fg)}
.chip .box{width:18px;height:18px;display:grid;place-items:center;border:1.5px solid currentColor;border-radius:5px;font-size:11px;flex:none}
.chip .num{font-family:var(--serif);font-size:11px;color:var(--muted);flex:none}
.chip.selected .num{color:inherit;opacity:.7}
/* ai */
.ai-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
@media(max-width:700px){.ai-grid{grid-template-columns:1fr}}
.ai-card{padding:22px;border:1.5px solid var(--line-strong);border-radius:18px;background:var(--card);transition:.15s}
.ai-card:hover{border-color:var(--primary);box-shadow:var(--shadow)}
.ai-card h3{font-size:18px;margin-top:10px}
.ai-card p{color:var(--muted);font-size:13px;margin-top:6px}
.ai-card .for{font-size:11px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.ai-logo{width:48px;height:48px;display:grid;place-items:center;border:1.5px solid var(--line);border-radius:12px;background:var(--card-2)}
/* lesson */
.lesson{max-width:720px;margin:0 auto}
.lesson h2{font-size:22px;margin:24px 0 10px;letter-spacing:-.03em}
.lesson h3{font-size:16px;margin:18px 0 8px}
.lesson p{color:var(--fg);font-size:14.5px;line-height:1.7;margin:8px 0}
.lesson .muted{color:var(--muted)}
.lesson ul, .lesson ol{margin:8px 0;padding-left:20px}
.lesson li{margin:4px 0;font-size:14px}
.lesson .callout{margin:16px 0;padding:14px 16px;border:1px solid var(--line);border-radius:12px;background:var(--card-2)}
.lesson .callout b{color:var(--primary)}
.lesson pre{margin:12px 0;padding:14px 16px;border-radius:12px;background:#0f172a;color:#e2e8f0;overflow:auto;font:13px/1.6 var(--mono);border:1px solid #1e293b}
html[data-theme="dark"] .lesson pre{background:#020617}
.lesson table{width:100%;border-collapse:collapse;margin:12px 0;font-size:13.5px}
.lesson th, .lesson td{border:1px solid var(--line);padding:8px 10px;text-align:left}
.lesson th{background:var(--card-2);font-size:12px;letter-spacing:.04em;text-transform:uppercase}
.formula{padding:12px 16px;border:1px solid var(--line);border-radius:12px;background:var(--accent-soft);font-family:var(--serif);font-size:16px}
.formula code{font-family:var(--mono);font-size:14px;background:var(--card);padding:2px 6px;border-radius:6px;border:1px solid var(--line)}
/* empty / loading */
.empty{padding:40px 20px;text-align:center;border:1px dashed var(--line);border-radius:14px;background:var(--card-2)}
.empty .big{font-size:44px}
.empty h3{margin-top:10px}
.empty p{color:var(--muted);font-size:13.5px;margin-top:6px}
.skeleton{height:14px;border-radius:8px;background:linear-gradient(90deg, var(--line) 25%, var(--card-2) 50%, var(--line) 75%);background-size:200% 100%;animation:shimmer 1.2s infinite}
@keyframes shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
/* search */
.search-input{width:100%;padding:14px 16px;border:1.5px solid var(--line);border-radius:12px;background:var(--card);font-size:14.5px;outline:0}
.search-input:focus{border-color:var(--accent);box-shadow:0 0 0 4px color-mix(in srgb, var(--accent) 14%, transparent)}
.search-result{display:flex;justify-content:space-between;gap:12px;padding:12px 14px;border:1px solid var(--line);border-radius:11px;background:var(--card);transition:.12s}
.search-result:hover{border-color:var(--fg);background:var(--card-2)}
.toast{position:fixed;left:50%;bottom:84px;transform:translateX(-50%) translateY(12px);background:var(--fg);color:var(--bg);padding:10px 16px;border-radius:999px;font-size:13px;font-weight:600;opacity:0;pointer-events:none;transition:.2s;z-index:60;max-width:90vw;text-align:center}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
/* footer */
.footer{margin-top:auto;padding:22px 0 28px;border-top:1px solid var(--line);color:var(--muted);font-size:12px}
.footer-inner{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.footer a{font-weight:700}
.footer a:hover{text-decoration:underline}
/* utilities */
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.col{display:flex;flex-direction:column;gap:12px}
.divider{height:1px;background:var(--line);margin:16px 0}
.kbd{display:inline-flex;align-items:center;justify-content:center;min-width:26px;height:26px;padding:0 7px;border:1px solid var(--line);border-bottom-width:2px;border-radius:7px;background:var(--card);font:12px var(--mono);font-weight:700}