:root{
  --bg:#ffffff;--bg-soft:#f8fafc;--bg-muted:#f1f5f9;--line:#e5e7eb;--line-strong:#cbd5e1;
  --text:#0a0a0a;--text-2:#334155;--text-3:#64748b;
  --brand:#2563eb;--brand-strong:#1d4ed8;--brand-soft:#dbeafe;--brand-soft-2:#eff6ff;
  --good:#16a34a;--good-soft:#dcfce7;--ok:#d97706;--ok-soft:#fef3c7;--fix:#dc2626;--fix-soft:#fee2e2;
  --ink:#0f172a;--ink-2:#1e293b;
  --radius:14px;--radius-sm:10px;--shadow:0 1px 2px rgba(15,23,42,.06),0 8px 24px -12px rgba(15,23,42,.18);
  --font:'Inter','Noto Sans TC','Noto Sans SC',system-ui,-apple-system,'PingFang TC','Microsoft JhengHei',sans-serif;
  --maxw:1080px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.55;-webkit-font-smoothing:antialiased;padding-bottom:env(safe-area-inset-bottom)}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img,svg,video,canvas{max-width:100%;height:auto}
button{font-family:inherit}
h1,h2,h3,h4{line-height:1.2;margin:0 0 .5em;letter-spacing:-.01em}
h1{font-size:clamp(1.9rem,5vw,2.9rem);font-weight:800}
h2{font-size:clamp(1.4rem,3.4vw,1.9rem);font-weight:800}
h3{font-size:1.15rem;font-weight:700}
p{margin:0 0 1em}
.muted{color:var(--text-3)}
.small{font-size:.875rem}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.narrow{max-width:760px}
.section{padding:48px 0}
.section.tight{padding:28px 0}
.center{text-align:center}
.hidden{display:none!important}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* nav */
.nav{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.nav .container{display:flex;align-items:center;gap:16px;height:60px}
.nav .logo{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--ink);font-size:1.05rem}
.nav .logo img{height:26px;width:auto}
.nav .links{display:flex;gap:4px;margin-left:auto;align-items:center}
.nav .links a{color:var(--text-2);padding:8px 12px;border-radius:999px;font-weight:600;font-size:.92rem}
.nav .links a:hover{background:var(--bg-muted);text-decoration:none}
.nav .links a.active{color:var(--brand);background:var(--brand-soft-2)}
.nav .links .btn{margin-left:6px}
.nav .burger{display:none;margin-left:auto;border:1px solid var(--line);background:#fff;border-radius:10px;padding:8px 10px;cursor:pointer}
@media (max-width:820px){
  .nav .links{display:none;position:absolute;left:0;right:0;top:60px;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:10px 16px 16px;gap:2px}
  .nav .links.open{display:flex}
  .nav .links a{padding:12px 10px}
  .nav .links .btn{margin:8px 0 0}
  .nav .burger{display:block}
}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 18px;border-radius:999px;font-weight:700;font-size:.95rem;border:1px solid transparent;cursor:pointer;transition:.15s;text-decoration:none!important;line-height:1.2}
.btn.primary{background:var(--brand);color:#fff}
.btn.primary:hover{background:var(--brand-strong)}
.btn.secondary{background:#fff;color:var(--ink);border-color:var(--line-strong)}
.btn.secondary:hover{background:var(--bg-soft)}
.btn.ghost{background:transparent;color:var(--brand)}
.btn.ghost:hover{background:var(--brand-soft-2)}
.btn.dark{background:var(--ink);color:#fff}
.btn.dark:hover{background:var(--ink-2)}
.btn.lg{padding:14px 24px;font-size:1.05rem}
.btn.sm{padding:7px 12px;font-size:.85rem}
.btn.block{width:100%}
.btn[disabled]{opacity:.55;cursor:not-allowed}
.btn.good{background:var(--good);color:#fff}

/* hero */
.hero{padding:64px 0 40px;background:linear-gradient(180deg,#f8fbff 0%,#fff 100%)}
.hero h1{max-width:760px}
.hero .lead{font-size:1.15rem;color:var(--text-2);max-width:640px}
.hero .actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.eyebrow{display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--brand);margin-bottom:10px}

/* grids + cards */
.grid{display:grid;gap:16px}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
.grid.cols-4{grid-template-columns:repeat(4,1fr)}
@media (max-width:820px){.grid.cols-3,.grid.cols-4{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.grid.cols-3,.grid.cols-2,.grid.cols-4{grid-template-columns:1fr}}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.card.flat{box-shadow:none}
.card.soft{background:var(--bg-soft);border-color:transparent;box-shadow:none}
.card h3{margin-bottom:6px}
.card .num{display:inline-flex;width:30px;height:30px;border-radius:999px;background:var(--ink);color:#fff;font-weight:800;align-items:center;justify-content:center;font-size:.9rem;margin-bottom:12px}

/* stage cards */
.stage-card{display:flex;flex-direction:column;gap:8px;position:relative;overflow:hidden}
.stage-card .stage-n{font-size:.78rem;font-weight:700;color:var(--brand);letter-spacing:.06em;text-transform:uppercase}
.stage-card ul{margin:8px 0 0;padding:0;list-style:none;display:flex;flex-direction:column;gap:6px}
.stage-card li{display:flex;gap:10px;align-items:flex-start;font-size:.93rem;color:var(--text-2)}
.stage-card li .dot{width:8px;height:8px;border-radius:999px;background:var(--line-strong);margin-top:8px;flex:none}
.stage-card li.done .dot{background:var(--good)}
.stage-card .foot{margin-top:auto;padding-top:12px}
.progress{height:8px;background:var(--bg-muted);border-radius:999px;overflow:hidden}
.progress > span{display:block;height:100%;background:var(--brand);border-radius:999px;width:0;transition:width .4s}
.pill{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;font-size:.78rem;font-weight:700;background:var(--bg-muted);color:var(--text-2)}
.pill.brand{background:var(--brand-soft);color:var(--brand-strong)}
.pill.good{background:var(--good-soft);color:#166534}
.pill.ok{background:var(--ok-soft);color:#92400e}
.pill.fix{background:var(--fix-soft);color:#991b1b}
.pill.pro{background:var(--ink);color:#fff}

/* lesson list */
.lesson-list{display:flex;flex-direction:column;gap:10px}
.lesson-row{display:flex;gap:14px;align-items:center;padding:14px 16px;border:1px solid var(--line);border-radius:var(--radius-sm);background:#fff;color:inherit;text-decoration:none!important;transition:.15s}
.lesson-row:hover{border-color:var(--brand);box-shadow:var(--shadow)}
.lesson-row .idx{width:34px;height:34px;border-radius:999px;background:var(--bg-muted);display:flex;align-items:center;justify-content:center;font-weight:800;flex:none;color:var(--text-2)}
.lesson-row.done .idx{background:var(--good-soft);color:#166534}
.lesson-row .t{font-weight:700}
.lesson-row .s{font-size:.86rem;color:var(--text-3)}
.lesson-row .meta{margin-left:auto;font-size:.8rem;color:var(--text-3);white-space:nowrap}

/* lesson page */
.lesson-head{padding:36px 0 20px;border-bottom:1px solid var(--line);background:var(--bg-soft)}
.lesson-head .crumbs{font-size:.85rem;color:var(--text-3);margin-bottom:10px}
.lesson-head .crumbs a{color:var(--text-3)}
.lesson-head .sub{font-size:1.1rem;color:var(--text-2);max-width:700px}
.lesson-head .meta{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px;align-items:center}
.lesson-body{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:40px;padding:32px 0 60px}
@media (max-width:900px){.lesson-body{grid-template-columns:1fr;gap:24px}}
.prose{font-size:1.03rem}
.prose h2{font-size:1.35rem;margin:36px 0 12px;padding-top:8px;display:flex;align-items:center;gap:10px}
.prose h2:first-child{margin-top:0}
.prose h2 .k{width:28px;height:28px;border-radius:8px;background:var(--brand-soft-2);color:var(--brand);display:inline-flex;align-items:center;justify-content:center;font-size:.85rem;font-weight:800}
.prose ol,.prose ul{padding-left:1.35em;margin:0 0 1em}
.prose li{margin-bottom:.55em}
.prose ol li::marker{font-weight:700;color:var(--brand)}
.prose blockquote{margin:16px 0;padding:14px 18px;border-left:4px solid var(--brand);background:var(--brand-soft-2);border-radius:0 var(--radius-sm) var(--radius-sm) 0;color:var(--ink-2)}
.prose blockquote p:last-child{margin:0}
.prose code{background:var(--bg-muted);padding:1px 6px;border-radius:6px;font-size:.92em}
.prose .figure{margin:8px 0 24px;border:1px solid var(--line);border-radius:var(--radius);padding:16px;background:#fff}
.prose .figure svg{width:100%;height:auto;max-height:340px;display:block;margin:0 auto}
.prose .figure figcaption{font-size:.88rem;color:var(--text-3);margin-top:10px;text-align:center}
.checklist{list-style:none;padding:0!important;margin:0 0 1em}
.checklist li{margin:0 0 8px}
.checklist label{display:flex;gap:12px;align-items:flex-start;padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius-sm);cursor:pointer;background:#fff}
.checklist label:has(input:checked){background:var(--good-soft);border-color:#86efac}
.checklist input{margin-top:4px;width:18px;height:18px;accent-color:var(--good);flex:none}
.upload-cta{margin:12px 0 0;padding:18px;border:1px dashed var(--brand);border-radius:var(--radius);background:var(--brand-soft-2);display:flex;gap:14px;align-items:center;flex-wrap:wrap;justify-content:space-between}
.video-ref{margin:10px 0 24px;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.video-ref .embed{position:relative;padding-top:56.25%;background:#000}
.video-ref iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.video-ref .note{padding:10px 14px;font-size:.88rem;color:var(--text-2);background:var(--bg-soft)}
.lesson-side{position:sticky;top:76px;align-self:start;display:flex;flex-direction:column;gap:14px}
.lesson-side .card{padding:16px}
.lesson-side .toc a{display:block;padding:6px 0;color:var(--text-2);font-size:.92rem}
.lesson-side .toc a:hover{color:var(--brand);text-decoration:none}
.lesson-nav{display:flex;justify-content:space-between;gap:12px;margin-top:32px;padding-top:24px;border-top:1px solid var(--line);flex-wrap:wrap}
.complete-bar{position:sticky;bottom:0;background:rgba(255,255,255,.95);backdrop-filter:blur(10px);border-top:1px solid var(--line);padding:12px 0;z-index:30}
.complete-bar .container{display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap}

/* quiz */
.quiz{max-width:640px;margin:0 auto}
.quiz .q{font-size:1.25rem;font-weight:800;margin:0 0 16px}
.quiz .opts{display:flex;flex-direction:column;gap:10px}
.quiz .opt{display:flex;align-items:center;gap:12px;padding:14px 16px;border:1px solid var(--line);border-radius:var(--radius-sm);background:#fff;cursor:pointer;text-align:left;font-size:1rem;font-weight:500;transition:.12s;width:100%}
.quiz .opt:hover{border-color:var(--brand)}
.quiz .opt.selected{border-color:var(--brand);background:var(--brand-soft-2);box-shadow:inset 0 0 0 1px var(--brand)}
.quiz .opt .key{width:26px;height:26px;border-radius:8px;background:var(--bg-muted);display:inline-flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:800;color:var(--text-2);flex:none}
.quiz .steps{display:flex;gap:6px;margin-bottom:22px}
.quiz .steps span{flex:1;height:6px;border-radius:999px;background:var(--bg-muted)}
.quiz .steps span.on{background:var(--brand)}
.quiz .nav-row{display:flex;justify-content:space-between;margin-top:22px;gap:10px}
.placement{border-radius:var(--radius);padding:28px;background:linear-gradient(135deg,#0f172a,#1e3a8a);color:#fff;margin-bottom:22px}
.placement .lvl{font-size:2rem;font-weight:800;margin:4px 0 6px}
.placement p{color:rgba(255,255,255,.85);margin:0}

/* analyze */
.drop{border:2px dashed var(--line-strong);border-radius:var(--radius);padding:36px 20px;text-align:center;background:var(--bg-soft)}
.drop.active{border-color:var(--brand);background:var(--brand-soft-2)}
.drop .actions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:14px}
.status{display:flex;align-items:center;gap:12px;padding:16px;border-radius:var(--radius);background:var(--bg-soft);margin-top:16px}
.spinner{width:22px;height:22px;border:3px solid var(--line);border-top-color:var(--brand);border-radius:999px;animation:spin .8s linear infinite;flex:none}
@keyframes spin{to{transform:rotate(360deg)}}
.takeaways{display:grid;gap:12px;margin-top:16px}
.take{padding:14px 16px;border-radius:var(--radius-sm);border:1px solid var(--line);display:flex;gap:12px;align-items:flex-start}
.take .tag{font-size:.72rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase;padding:4px 8px;border-radius:6px;flex:none;margin-top:2px}
.take.good{border-color:#86efac;background:#f0fdf4}.take.good .tag{background:var(--good);color:#fff}
.take.ok{border-color:#fcd34d;background:#fffbeb}.take.ok .tag{background:var(--ok);color:#fff}
.take.fix{border-color:#fca5a5;background:#fef2f2}.take.fix .tag{background:var(--fix);color:#fff}
.dims{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:14px}
@media (max-width:560px){.dims{grid-template-columns:1fr}}
.dim{padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius-sm);background:#fff}
.dim .row{display:flex;justify-content:space-between;align-items:center;font-weight:700;font-size:.92rem}
.dim .bar{height:6px;background:var(--bg-muted);border-radius:999px;margin:8px 0;overflow:hidden}
.dim .bar span{display:block;height:100%;background:var(--brand);border-radius:999px}
.dim .adv{font-size:.86rem;color:var(--text-2)}
.annot{margin-top:18px;border-radius:var(--radius);overflow:hidden;background:var(--ink)}
.annot canvas{width:100%;height:auto;display:block}
.frames{display:flex;gap:8px;margin-top:12px}
.frames img{width:33%;border-radius:8px;border:1px solid var(--line)}
.lesson-links{display:flex;flex-direction:column;gap:8px;margin-top:10px}

/* dashboard */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
@media (max-width:640px){.stats{grid-template-columns:1fr 1fr}}
.stat{padding:16px;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
.stat .v{font-size:1.8rem;font-weight:800;line-height:1.1}
.stat .l{font-size:.82rem;color:var(--text-3);font-weight:600;text-transform:uppercase;letter-spacing:.05em}
.hist{display:flex;flex-direction:column;gap:10px}
.hist .item{display:flex;gap:12px;align-items:flex-start;padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius-sm);background:#fff}
.hist .item .when{font-size:.78rem;color:var(--text-3);white-space:nowrap}
.hist .item .fix{font-size:.92rem;color:var(--text-2)}
.trend{width:100%;height:auto}

/* pricing */
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media (max-width:820px){.plans{grid-template-columns:1fr}}
.plan{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:#fff;display:flex;flex-direction:column;gap:12px}
.plan.hot{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
.plan .price{font-size:2.2rem;font-weight:800}
.plan .price small{font-size:.9rem;color:var(--text-3);font-weight:500;margin-left:6px}
.plan ul{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:8px;color:var(--text-2);font-size:.95rem}
.plan li::before{content:"\2713";color:var(--good);font-weight:800;margin-right:8px}
.plan .cta{margin-top:auto}

/* forms */
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:12px}
.field label{font-weight:600;font-size:.9rem}
.input{padding:12px 14px;border:1px solid var(--line-strong);border-radius:var(--radius-sm);font-size:1rem;font-family:inherit;width:100%}
.input:focus{outline:2px solid var(--brand-soft);border-color:var(--brand)}
.notice{padding:12px 14px;border-radius:var(--radius-sm);background:var(--bg-soft);border:1px solid var(--line);font-size:.92rem}
.notice.good{background:var(--good-soft);border-color:#86efac}
.notice.bad{background:var(--fix-soft);border-color:#fca5a5}
.divider{display:flex;align-items:center;gap:12px;color:var(--text-3);font-size:.85rem;margin:16px 0}
.divider::before,.divider::after{content:"";flex:1;height:1px;background:var(--line)}
.google-btn{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;padding:12px;border:1px solid var(--line-strong);border-radius:999px;background:#fff;font-weight:700;font-size:.98rem;cursor:pointer;color:var(--ink);text-decoration:none!important}
.google-btn:hover{background:var(--bg-soft)}

/* footer */
.footer{border-top:1px solid var(--line);padding:32px 0;margin-top:40px;color:var(--text-3);font-size:.88rem}
.footer .container{display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between}
.footer a{color:var(--text-2);margin-right:14px}
.footer select{font-family:inherit;padding:6px 10px;border-radius:8px;border:1px solid var(--line-strong);background:#fff}

.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:var(--ink);color:#fff;padding:10px 16px;border-radius:999px;font-size:.9rem;box-shadow:var(--shadow);z-index:60;opacity:0;transition:.2s;pointer-events:none}
.toast.show{opacity:1}