:root{
  --p:#5146e5; --p2:#7c6cff; --p-soft:#eeedff; --acc:#ff8a4c; --acc-soft:#fff1e8;
  --ok:#16a34a; --ok-soft:#e8f8ee; --bad:#dc2626; --bad-soft:#fdecec;
  --ink:#1d1b3a; --muted:#6b6a85; --line:#e7e6f2; --bg:#f8f8fd; --card:#fff;
  --r:18px; --sh:0 6px 24px rgba(40,30,120,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Inter","Noto Sans TC","PingFang TC","Microsoft JhengHei",system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--p);text-decoration:none}
img{max-width:100%}
.container{max-width:1120px;margin:0 auto;padding:0 20px}
/* header */
header.site{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:16px;height:64px}
.logo{display:flex;align-items:center;gap:8px;line-height:1.15;font-weight:800;font-size:20px;color:var(--ink)}
.logo .mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--p),var(--acc));color:#fff;display:grid;place-items:center;font-size:16px}
.logo small{font-weight:600;color:var(--muted);font-size:12px}
.nav-links{display:flex;gap:4px;margin-left:auto;align-items:center}
.nav-links a{color:var(--ink);padding:8px 11px;border-radius:10px;font-size:15px;font-weight:500;white-space:nowrap}
.nav-links a:hover,.nav-links a.active{background:var(--p-soft);color:var(--p)}
.nav-user{display:flex;gap:8px;align-items:center}
.menu-btn{display:none;margin-left:auto;background:none;border:0;font-size:26px;cursor:pointer;color:var(--ink)}
@media (max-width:980px){
  .menu-btn{display:block}
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;padding:12px 20px 20px;border-bottom:1px solid var(--line);box-shadow:var(--sh)}
  .nav-links.open{display:flex}
  .nav-links a{padding:12px}
  .nav-user{flex-direction:column;align-items:stretch;margin-top:8px}
}
/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:0;border-radius:12px;padding:11px 20px;font-size:15px;font-weight:700;cursor:pointer;font-family:inherit;transition:.15s;background:var(--p);color:#fff;text-align:center}
.btn:hover{filter:brightness(1.08);transform:translateY(-1px)}
.btn.ghost{background:var(--p-soft);color:var(--p)}
.btn.line{background:#fff;border:1.5px solid var(--line);color:var(--ink)}
.btn.acc{background:var(--acc)}
.btn.sm{padding:7px 13px;font-size:14px;border-radius:10px}
.btn.lg{padding:15px 28px;font-size:17px}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}
.btn.block{width:100%}
/* layout */
main{min-height:70vh;padding-bottom:60px}
.page-head{padding:36px 0 18px}
.page-head h1{margin:0 0 6px;font-size:30px}
.page-head p{margin:0;color:var(--muted)}
.crumb{font-size:14px;color:var(--muted);margin-bottom:6px}
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
@media (max-width:900px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:600px){.g2,.g3,.g4{grid-template-columns:1fr}.page-head h1{font-size:24px}}
.card{background:var(--card);border-radius:var(--r);box-shadow:var(--sh);padding:22px;border:1px solid var(--line);position:relative}
.card h3{margin:0 0 6px}
.card.click{cursor:pointer;transition:.18s}
.card.click:hover{transform:translateY(-3px);box-shadow:0 12px 30px rgba(40,30,120,.14)}
.muted{color:var(--muted)}
.tag{display:inline-block;font-size:12px;font-weight:700;padding:3px 9px;border-radius:999px;background:var(--p-soft);color:var(--p)}
.tag.acc{background:var(--acc-soft);color:#d4581b}
.tag.ok{background:var(--ok-soft);color:var(--ok)}
.tag.lock{background:#f1f0f6;color:#555}
.icon-lg{font-size:34px;line-height:1}
.notice{background:var(--acc-soft);border:1px dashed #ffb48a;color:#8a3a10;padding:12px 16px;border-radius:12px;font-size:14px;margin:14px 0}
.notice.info{background:var(--p-soft);border-color:#c5c0ff;color:#3a33a8}
.section{padding:56px 0}
.section h2{font-size:28px;margin:0 0 8px;text-align:center}
.section .sub{text-align:center;color:var(--muted);margin:0 0 32px}
/* hero */
.hero{background:radial-gradient(1200px 500px at 85% -10%,#ffe3d2 0,transparent 60%),radial-gradient(900px 500px at -10% 20%,#e2deff 0,transparent 60%);padding:64px 0 56px}
.hero-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:40px;align-items:center}
.hero h1{font-size:46px;line-height:1.2;margin:12px 0 16px;letter-spacing:-.5px}
.hero h1 .hl{background:linear-gradient(90deg,var(--p),var(--acc));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:18px;color:var(--muted);margin:0 0 26px}
.hero .ctas{display:flex;gap:12px;flex-wrap:wrap}
.hero-stats{display:flex;gap:26px;margin-top:28px;flex-wrap:wrap}
.hero-stats b{display:block;font-size:24px}
.hero-stats span{color:var(--muted);font-size:14px}
.hero-card{background:#fff;border-radius:24px;box-shadow:0 20px 50px rgba(60,40,160,.16);padding:26px;transform:rotate(1.5deg)}
.hero-card .word{font-size:34px;font-weight:800}
.hero-card .bubble{background:var(--p-soft);border-radius:14px;padding:12px 14px;margin-top:12px;font-size:15px}
.hero-card .bubble.me{background:var(--acc-soft);margin-left:30px}
@media (max-width:860px){.hero-grid{grid-template-columns:1fr}.hero h1{font-size:34px}.hero-card{transform:none}}
.feature .icon-lg{margin-bottom:10px}
.steps{counter-reset:s}
.step{padding-left:56px;position:relative}
.step:before{counter-increment:s;content:counter(s);position:absolute;left:0;top:0;width:40px;height:40px;border-radius:12px;background:var(--p);color:#fff;display:grid;place-items:center;font-weight:800}
.cta-band{background:linear-gradient(120deg,var(--p),#8b5cf6 60%,var(--acc));color:#fff;border-radius:28px;padding:44px 28px;text-align:center}
.cta-band h2{color:#fff}
.cta-band .btn{background:#fff;color:var(--p)}
footer{background:#14122b;color:#b9b8d0;padding:36px 0;font-size:14px}
footer a{color:#dcdaf5}
.foot-grid{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
/* flashcard */
.fc-wrap{perspective:1200px;max-width:560px;margin:0 auto}
.fc{position:relative;height:340px;transform-style:preserve-3d;transition:transform .5s;cursor:pointer}
.fc.flipped{transform:rotateY(180deg)}
.fc-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:24px;background:#fff;box-shadow:var(--sh);border:1px solid var(--line);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:26px;text-align:center}
.fc-back{transform:rotateY(180deg);background:linear-gradient(160deg,#fff,#f4f2ff)}
.fc .en{font-size:34px;font-weight:800;line-height:1.25}
.fc .ipa{color:var(--muted);font-size:17px;margin-top:6px}
.fc .zh{font-size:26px;font-weight:800;color:var(--p)}
.fc .ex{margin-top:14px;font-size:17px}
.fc .exzh{color:var(--muted);font-size:15px}
.fc .hint{position:absolute;bottom:14px;font-size:13px;color:var(--muted)}
.fc-ctrl{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:18px}
.speak{background:var(--p-soft);color:var(--p);border:0;border-radius:999px;padding:8px 14px;font-weight:700;cursor:pointer;font-family:inherit;font-size:14px}
.speak:hover{background:var(--p);color:#fff}
.progressbar{height:10px;border-radius:99px;background:#ecebf5;overflow:hidden}
.progressbar>i{display:block;height:100%;background:linear-gradient(90deg,var(--p),var(--acc));border-radius:99px;transition:width .3s}
.word-list{display:grid;gap:10px}
.word-row{display:flex;gap:12px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px 14px}
.word-row .w{flex:1}
.word-row .w b{font-size:16px}
/* lock */
.locked{opacity:.92}
.locked:after{content:"🔒 Pro";position:absolute;top:14px;right:14px;background:#1d1b3a;color:#fff;font-size:12px;font-weight:700;padding:3px 10px;border-radius:99px}
.lock-panel{text-align:center;padding:40px 20px}
.lock-panel .icon-lg{font-size:48px}
/* quiz */
.quiz{max-width:680px;margin:0 auto}
.quiz .qtext{font-size:21px;font-weight:700;margin:12px 0 18px}
.opts{display:grid;gap:10px}
.opt{text-align:left;background:#fff;border:2px solid var(--line);border-radius:14px;padding:14px 16px;font-size:16px;cursor:pointer;font-family:inherit;color:var(--ink);display:flex;gap:12px;align-items:center}
.opt:hover:not(:disabled){border-color:var(--p2);background:#faf9ff}
.opt .k{width:28px;height:28px;border-radius:8px;background:var(--p-soft);color:var(--p);display:grid;place-items:center;font-weight:800;flex:none}
.opt.correct{border-color:var(--ok);background:var(--ok-soft)}
.opt.wrong{border-color:var(--bad);background:var(--bad-soft)}
.opt:disabled{cursor:default}
.explain{margin-top:14px;padding:14px 16px;border-radius:14px;background:var(--p-soft);font-size:15px}
.score-ring{width:150px;height:150px;border-radius:50%;display:grid;place-items:center;margin:10px auto;font-size:34px;font-weight:800;background:conic-gradient(var(--p) calc(var(--v)*1%),#ecebf5 0)}
.score-ring span{width:118px;height:118px;border-radius:50%;background:#fff;display:grid;place-items:center}
.review-item{border-left:4px solid var(--line);padding:8px 14px;margin:10px 0;background:#fff;border-radius:0 12px 12px 0}
.review-item.ok{border-color:var(--ok)}.review-item.no{border-color:var(--bad)}
/* forms */
label{display:block;font-weight:600;font-size:14px;margin:12px 0 6px}
input,textarea,select{width:100%;padding:11px 13px;border:1.5px solid var(--line);border-radius:12px;font-size:15px;font-family:inherit;background:#fff;color:var(--ink)}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--p2);box-shadow:0 0 0 3px var(--p-soft)}
textarea{min-height:110px;resize:vertical}
.form-card{max-width:440px;margin:30px auto}
.err{color:var(--bad);font-size:14px;margin-top:10px;min-height:20px}
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin:6px 0 20px;border-bottom:1px solid var(--line)}
.tabs button{background:none;border:0;padding:10px 14px;font-size:15px;font-weight:600;cursor:pointer;color:var(--muted);border-bottom:3px solid transparent;font-family:inherit}
.tabs button.on{color:var(--p);border-color:var(--p)}
.builder{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:start}
@media (max-width:860px){.builder{grid-template-columns:1fr}}
.preview{background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px;font-family:Georgia,"Times New Roman",serif;font-size:14px;line-height:1.55;white-space:pre-wrap;min-height:300px;color:#222}
.preview h2{font-family:inherit;margin:0;font-size:22px;text-align:center}
.preview .ctr{text-align:center;color:#555}
.preview h4{font-family:inherit;border-bottom:1.5px solid #333;margin:14px 0 6px;font-size:13px;letter-spacing:1px;text-transform:uppercase}
.sticky{position:sticky;top:84px}
table{width:100%;border-collapse:collapse;font-size:15px}
th,td{text-align:left;padding:10px;border-bottom:1px solid var(--line)}
th{color:var(--muted);font-weight:600;font-size:13px}
.acc-item{border:1px solid var(--line);border-radius:14px;background:#fff;margin-bottom:10px;overflow:hidden}
.acc-item summary{padding:16px 18px;cursor:pointer;font-weight:700;list-style:none;display:flex;gap:10px;align-items:center}
.acc-item summary::-webkit-details-marker{display:none}
.acc-item summary:after{content:"＋";margin-left:auto;color:var(--p)}
.acc-item[open] summary:after{content:"－"}
.acc-body{padding:0 18px 18px}
.stat b{font-size:32px;display:block;line-height:1.2}
.stat span{color:var(--muted);font-size:14px}
.plan{display:flex;flex-direction:column}
.plan .price{font-size:38px;font-weight:800;margin:8px 0}
.plan .price small{font-size:15px;color:var(--muted);font-weight:600}
.plan ul{padding-left:0;list-style:none;margin:10px 0 20px;flex:1}
.plan li{padding:6px 0 6px 26px;position:relative}
.plan li:before{content:"✓";position:absolute;left:0;color:var(--ok);font-weight:800}
.plan.popular{border:2px solid var(--p);transform:translateY(-6px)}
.plan .ribbon{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--p);color:#fff;font-size:12px;font-weight:700;padding:4px 12px;border-radius:99px}
.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%) translateY(20px);background:#1d1b3a;color:#fff;padding:12px 20px;border-radius:12px;opacity:0;transition:.25s;z-index:100;font-size:15px;pointer-events:none;max-width:90vw}
.toast.show{opacity:1;transform:translateX(-50%)}
.mic.on{background:var(--bad);color:#fff;animation:pulse 1.2s infinite}
@keyframes pulse{50%{box-shadow:0 0 0 8px rgba(220,38,38,.15)}}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.between{justify-content:space-between}
.mt{margin-top:18px}.mb{margin-bottom:18px}
.verb{display:flex;justify-content:space-between;gap:10px;align-items:flex-start}
/* 雲端同步狀態 */
.sync-status{display:inline-block;font-size:13px;padding:4px 12px;border-radius:999px;background:#eef9f1;color:#1d7a3e;margin:6px 0 0}
.sync-status[data-state="local"]{background:#f1f0f8;color:var(--muted)}
.sync-status[data-state="pending"],.sync-status[data-state="saving"]{background:#eef3ff;color:#3b5bdb}
.sync-status[data-state="error"],.sync-status[data-state="offline"]{background:#fff4e6;color:#b35c00}
.coming-soon .icon-lg{text-align:center}
button[disabled]{cursor:not-allowed;opacity:.65}