:root{--ink:#16313b;--muted:#788984;--paper:#fffdf8;--mist:#e7f0eb;--mint:#d7f1e3;--coral:#f36f59;--line:#d9e5df;--deep:#153f4d;--shadow:0 24px 60px rgba(24,60,69,.12)}
*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--mist);font-family:'Noto Sans SC',sans-serif}.grain{position:fixed;inset:0;pointer-events:none;opacity:.04;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}
.topbar{height:80px;display:flex;align-items:center;justify-content:space-between;padding:0 clamp(20px,7vw,100px);border-bottom:1px solid #d4e1db;background:rgba(255,253,248,.78);backdrop-filter:blur(16px)}.brand{display:flex;align-items:center;gap:11px}.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;color:var(--mint);background:var(--deep);font:700 20px 'Fraunces'}.brand strong{display:block;font:600 20px 'Fraunces'}.brand small{color:var(--muted);font:10px 'DM Mono';letter-spacing:.17em}.streak{color:var(--muted);font-size:13px}.flame{margin-right:7px;color:var(--coral)}button{font-family:inherit;cursor:pointer}.history-btn{border:0;background:none;color:var(--ink);font-size:13px}.history-btn span{margin-left:5px;color:var(--coral)}
.shell{width:min(1150px,calc(100% - 40px));margin:auto;padding:55px 0 38px}.intro-row{display:flex;align-items:end;justify-content:space-between;gap:40px;margin-bottom:30px}.eyebrow,.section-kicker{margin:0;color:#7e968e;font:500 10px 'DM Mono';letter-spacing:.18em}.intro-row h1{margin:11px 0 0;font:600 clamp(30px,4vw,42px) 'Fraunces';letter-spacing:-.03em}.intro-row h1 em{color:var(--coral);font-style:normal}.progress-wrap{width:230px;flex:0 0 auto}.progress-label{display:flex;justify-content:space-between;margin-bottom:10px;color:var(--muted);font-size:12px}.progress-label b{color:var(--ink);font:12px 'DM Mono'}.progress{height:7px;overflow:hidden;border-radius:10px;background:#d2e0d9}.progress i{display:block;width:0;height:100%;border-radius:inherit;background:var(--coral);transition:width .45s ease}
.study-layout{display:grid;grid-template-columns:minmax(0,1fr) 285px;gap:24px}.word-card{padding:31px 43px 25px;border:1px solid #dbe7e1;border-radius:24px;background:var(--paper);box-shadow:var(--shadow);animation:rise .55s ease both}.card-head{display:flex;align-items:center;justify-content:space-between}.tag{padding:7px 11px;border-radius:20px;color:#52736b;background:var(--mint);font-size:11px}.word-index{color:#9aaba4;font:12px 'DM Mono'}.word-main{display:flex;align-items:center;gap:15px;margin-top:43px}.word{font:600 clamp(54px,8vw,80px) 'Fraunces';letter-spacing:-.05em;line-height:1}.sound{width:40px;height:40px;border:1px solid #c1d3ca;border-radius:50%;color:var(--coral);background:#fff;font-size:21px}.sound:active{transform:scale(.93)}.phonetic{margin-top:11px;color:#55717a;font:17px 'DM Mono'}.phonetic span{margin-left:8px;color:#a0afaa;font:11px 'Noto Sans SC'}.meaning{margin-top:21px;font-size:19px;font-weight:700}.divider{height:1px;margin:28px 0 24px;background:var(--line)}.section-kicker{margin-bottom:9px}.section-kicker span{margin-left:7px;color:#afbbb6;font-family:'Noto Sans SC';letter-spacing:0}.example p{margin:0;font:21px/1.5 'Fraunces'}.example mark{color:var(--deep);background:linear-gradient(transparent 59%,var(--mint) 59%)}.example-cn{margin-top:8px!important;color:#70827e;font:14px/1.6 'Noto Sans SC'!important}.memory-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px;margin-top:28px}.memory-grid p{margin:0;color:#42636a;font-size:14px;line-height:1.6}.memory-note{display:flex;gap:12px;margin-top:23px;padding:13px 15px;border-radius:12px;background:#eef8f1}.memory-note>span{color:#df8b45;font-size:18px}.memory-note b{font-size:12px}.memory-note p{margin:4px 0 0;color:#58716e;font-size:13px;line-height:1.5}.rating{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-top:26px;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:12px}.rating-actions{display:flex;gap:9px}.rating button{padding:9px 13px;border:1px solid #d4dfda;border-radius:20px;background:#fff;font-size:12px;transition:transform .2s ease}.rating button:hover{transform:translateY(-2px)}.rating .again{color:#ca604e}.rating .know{border-color:var(--deep);color:#fff;background:var(--deep)}
.side-rail{display:flex;flex-direction:column;gap:16px}.visual-card,.synonym-card{overflow:hidden;border:1px solid #d6e2dc;border-radius:18px;background:rgba(255,253,248,.82)}.visual-art{display:grid;place-items:center;height:190px;font-size:90px;background:radial-gradient(circle at 70% 20%,#e1f6e9,#a5d9ca 58%,#82b9bc)}.visual-caption{padding:14px 16px 16px}.visual-caption span{display:block;color:#79918b;font:10px 'DM Mono';letter-spacing:.15em}.visual-caption b{display:block;margin-top:5px;font-size:14px}.synonym-card{padding:19px}.chips{display:flex;flex-wrap:wrap;gap:7px}.chips span{padding:7px 9px;border:1px solid #c2d7cd;border-radius:7px;color:#3e625f;background:#f8fbf8;font:12px 'DM Mono'}
.bottom-row{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:25px}.ghost-btn,.next-btn{border:0;font-size:13px}.ghost-btn{color:#70827d;background:none}.next-btn{padding:13px 20px;border-radius:10px;color:#fff;background:var(--coral);box-shadow:0 8px 20px #ff735e44}.source-note{color:#80918c;text-align:center;font-size:11px;line-height:1.7}.source-note span{color:#a6b2ae}.empty{padding:100px 20px;text-align:center}.empty>div{color:var(--coral);font-size:42px}.empty h2{margin:14px 0 8px;font:600 34px 'Fraunces'}.empty p{margin-bottom:24px;color:var(--muted)}
.modal{position:fixed;inset:0;z-index:10;display:none;align-items:center;justify-content:center;padding:20px;background:#102b3a66}.modal.open{display:flex}.modal-panel{width:min(500px,100%);padding:28px;border-radius:22px;background:var(--paper);box-shadow:0 30px 80px #102b3a44}.modal-top{display:flex;justify-content:space-between}.modal-top h2{margin:7px 0 20px;font:600 32px 'Fraunces'}.modal-top button{border:0;background:none;font-size:28px}.history-list{max-height:390px;overflow:auto}.history-day{padding:14px 0;border-top:1px solid var(--line)}.history-day strong{font:13px 'DM Mono'}.history-day p{margin:7px 0 0;color:#5d726e;font-size:13px}.clear-btn{margin-top:18px;padding:9px 13px;border:1px solid #e0b5ad;border-radius:8px;color:#c96757;background:none}
@keyframes rise{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}@media(max-width:800px){.topbar{height:72px;padding:0 18px}.streak{display:none}.shell{width:calc(100% - 28px);padding:33px 0}.intro-row{display:block}.progress-wrap{width:100%;margin-top:25px}.study-layout{grid-template-columns:1fr}.side-rail{display:grid;grid-template-columns:1fr 1fr}.word-card{padding:24px 21px}.word-main{margin-top:35px}.memory-grid{gap:16px}.rating{display:block}.rating-actions{justify-content:space-between;margin-top:12px}.bottom-row{gap:10px}.source-note{display:none}}
.memory-grid{grid-template-columns:1fr;gap:18px}.memory-row{padding-bottom:15px;border-bottom:1px solid #e5eee9}.antonym-title{margin-top:21px;padding-top:17px;border-top:1px solid var(--line)}
.meaning-reveal{display:flex;align-items:center;gap:14px;margin-top:21px}.meaning-reveal .meaning{margin-top:0;min-height:29px}.meaning.is-hidden{color:transparent;text-shadow:0 0 8px rgba(22,49,59,.5);user-select:none}.meaning-toggle{padding:7px 11px;border:1px solid #c6d8cf;border-radius:16px;color:#4f746c;background:#f4fbf6;font-size:11px;white-space:nowrap}.meaning-toggle:hover{border-color:var(--coral);color:var(--coral)}
.nav-btn{padding:9px 11px!important;color:#55716f;background:#f7fbf8!important}.nav-btn:disabled{opacity:.4;cursor:not-allowed}
html{min-height:100%;background:var(--mist)}body{min-height:100svh;overflow-x:hidden;-webkit-text-size-adjust:100%;overscroll-behavior-y:none}.rating button,.next-btn,.ghost-btn,.history-btn,.sound,.meaning-toggle{-webkit-tap-highlight-color:transparent;touch-action:manipulation}
@media (max-width:600px){.topbar{padding-top:env(safe-area-inset-top);height:calc(70px + env(safe-area-inset-top));align-items:flex-end;padding-bottom:13px}.brand strong{font-size:18px}.brand small{font-size:9px}.shell{width:calc(100% - 24px);padding:26px 0 calc(22px + env(safe-area-inset-bottom))}.intro-row{margin-bottom:22px}.intro-row h1{font-size:31px}.study-layout{gap:14px}.word-card{padding:21px 17px 18px;border-radius:20px}.word-main{margin-top:31px}.word{font-size:clamp(50px,15vw,70px)}.sound{width:42px;height:42px}.phonetic{font-size:15px}.meaning-reveal{align-items:flex-start;gap:10px;flex-wrap:wrap}.meaning-reveal .meaning{font-size:17px;flex:1 1 100%}.meaning-toggle{font-size:11px}.example p{font-size:19px}.memory-grid{gap:14px}.memory-row{padding-bottom:12px}.memory-grid p{font-size:13px}.memory-note{margin-top:17px;padding:11px 12px}.rating{margin-top:19px;padding-top:16px}.rating-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px}.rating-actions .know{grid-column:span 2}.rating-actions .nav-btn{font-size:11px}.side-rail{gap:12px}.visual-art{height:145px;font-size:70px}.visual-caption{padding:11px 12px}.visual-caption b{font-size:12px}.synonym-card{padding:14px}.chips span{font-size:11px;padding:6px 7px}.bottom-row{margin-top:16px}.ghost-btn,.next-btn{padding:11px 13px;font-size:12px}.modal-panel{padding:22px 18px;border-radius:18px}}

/* Account and authentication layer — an editorial "memory passport". */
.account-actions{display:flex;align-items:center;gap:12px}.sync-badge{display:inline-flex;align-items:center;gap:7px;color:#6f837d;font:10px 'DM Mono';letter-spacing:.04em}.sync-badge i{width:7px;height:7px;border-radius:50%;background:#a8b6b1;box-shadow:0 0 0 4px #a8b6b122}.sync-badge.is-syncing i{background:#df9b43;animation:pulse 1s infinite}.sync-badge.is-synced i{background:#42a47c}.sync-badge.is-error i{background:#d75b4d}.user-pill{display:none;align-items:center;gap:8px;padding:5px 10px 5px 5px;border:1px solid #cbd9d3;border-radius:999px;color:var(--ink);background:#fffdf8}.user-pill.is-visible{display:flex}.user-pill>span{display:grid;place-items:center;width:26px;height:26px;border-radius:50%;color:#fff;background:var(--deep);font:600 12px 'Fraunces'}.user-pill b{max-width:160px;overflow:hidden;text-overflow:ellipsis;font-size:11px;font-weight:500}.logout-btn{display:none;padding:7px 9px;border:0;color:#82918d;background:transparent;font-size:11px}.logout-btn.is-visible{display:block}
.word-card.is-complete> :not(.complete-state){display:none}.complete-state[hidden]{display:none}.word-card.is-complete .complete-state{display:block}
.auth-gate{position:fixed;inset:0;z-index:50;display:grid;place-items:center;padding:24px;background:radial-gradient(circle at 8% 5%,#fffaf0 0,transparent 34%),linear-gradient(135deg,#dcebe4 0%,#edf3ed 55%,#d7e5df 100%);transition:opacity .35s ease,visibility .35s ease}.auth-gate::before{content:"";position:absolute;inset:0;opacity:.12;background-image:linear-gradient(#153f4d 1px,transparent 1px),linear-gradient(90deg,#153f4d 1px,transparent 1px);background-size:42px 42px;mask-image:linear-gradient(135deg,#000,transparent 70%)}.auth-gate.is-hidden{visibility:hidden;opacity:0;pointer-events:none}.auth-card{position:relative;display:grid;grid-template-columns:minmax(300px,.84fr) minmax(390px,1.16fr);width:min(920px,100%);min-height:610px;overflow:hidden;border:1px solid #bfd0c8;border-radius:28px;background:var(--paper);box-shadow:0 35px 100px #173e4933;animation:auth-arrive .7s cubic-bezier(.2,.8,.2,1) both}.auth-story{position:relative;display:flex;flex-direction:column;justify-content:space-between;overflow:hidden;padding:36px;color:#f9f6ea;background:var(--deep)}.auth-story::before{content:"";position:absolute;width:330px;height:330px;right:-180px;top:92px;border:1px solid #d7f1e344;border-radius:50%;box-shadow:0 0 0 52px #d7f1e30b,0 0 0 105px #d7f1e30b}.auth-story::after{content:"";position:absolute;left:0;bottom:0;width:6px;height:44%;background:var(--coral)}.auth-brand{position:relative;z-index:1;display:flex;align-items:center;gap:12px}.auth-brand>span{display:grid;place-items:center;width:38px;height:38px;border:1px solid #d7f1e366;border-radius:50%;color:var(--mint);font:700 21px 'Fraunces'}.auth-brand b{display:block;font:600 19px 'Fraunces'}.auth-brand small{display:block;margin-top:3px;color:#c0d8cf;font:9px 'DM Mono';letter-spacing:.14em}.auth-constellation{position:relative;width:210px;height:190px;margin:auto}.auth-constellation i{position:absolute;width:7px;height:7px;border:1px solid var(--mint);border-radius:50%;background:#153f4d;box-shadow:0 0 18px #d7f1e3}.auth-constellation i:nth-child(1){left:5px;top:58px}.auth-constellation i:nth-child(2){left:68px;top:13px}.auth-constellation i:nth-child(3){right:22px;top:70px}.auth-constellation i:nth-child(4){left:50px;bottom:28px}.auth-constellation i:nth-child(5){right:4px;bottom:5px}.auth-constellation:before,.auth-constellation:after{content:"";position:absolute;height:1px;background:#d7f1e344;transform-origin:left}.auth-constellation:before{left:10px;top:62px;width:170px;transform:rotate(4deg)}.auth-constellation:after{left:57px;bottom:32px;width:145px;transform:rotate(-21deg)}.auth-constellation strong{position:absolute;left:43px;top:57px;font:600 61px 'Fraunces';letter-spacing:-.06em}.auth-constellation span{position:absolute;left:111px;top:119px;color:#b8d0c8;font:9px/1.5 'DM Mono';letter-spacing:.14em}.auth-copy{position:relative;z-index:1}.auth-copy p{margin:0 0 15px;font:500 30px/1.35 'Fraunces'}.auth-copy small{display:block;color:#bfd1cb;font-size:12px;line-height:1.8}.auth-workspace{align-self:center;padding:48px clamp(36px,6vw,72px)}.auth-workspace h1{margin:12px 0 8px;font:600 clamp(30px,4vw,42px) 'Fraunces';letter-spacing:-.04em}.auth-subtitle{margin:0 0 28px;color:#70817c;font-size:13px}.auth-tabs{display:grid;grid-template-columns:1fr 1fr;margin-bottom:24px;border-bottom:1px solid var(--line)}.auth-tabs button{position:relative;padding:11px;border:0;color:#8a9994;background:none;font-size:13px}.auth-tabs button.active{color:var(--ink);font-weight:700}.auth-tabs button.active::after{content:"";position:absolute;left:18%;right:18%;bottom:-1px;height:2px;background:var(--coral)}.auth-form{display:grid;gap:15px}.auth-form.is-hidden{display:none}.auth-form label>span{display:block;margin:0 0 7px;color:#546b67;font-size:11px;font-weight:700}.auth-form input{width:100%;height:45px;padding:0 13px;border:1px solid #cbdad3;border-radius:10px;outline:none;color:var(--ink);background:#fbfdf9;font:13px 'DM Mono';transition:border .2s,box-shadow .2s}.auth-form input:focus{border-color:#6c9d8d;box-shadow:0 0 0 4px #6c9d8d18}.code-row{display:grid;grid-template-columns:1fr auto;gap:8px}.code-row button{padding:0 13px;border:1px solid #c4d7ce;border-radius:10px;color:#42675f;background:#edf6f0;font-size:11px;white-space:nowrap}.code-row button:disabled{opacity:.55;cursor:not-allowed}.auth-submit{height:47px;margin-top:3px;border:0;border-radius:11px;color:#fff;background:var(--deep);box-shadow:0 10px 25px #153f4d2c;font-size:13px;font-weight:700}.auth-submit span{margin-left:7px;color:var(--mint)}.auth-submit:disabled{opacity:.62;cursor:wait}.auth-status{display:none;margin-top:14px;padding:10px 12px;border-radius:9px;color:#396457;background:#e7f5ec;font-size:12px;line-height:1.6}.auth-status.is-visible{display:block}.auth-status.is-error{color:#9f4439;background:#fceae6}.auth-footnote{margin:17px 0 0;color:#96a49f;text-align:center;font-size:10px}.toast{position:fixed;left:50%;bottom:28px;z-index:70;max-width:min(420px,calc(100% - 28px));padding:11px 17px;border-radius:999px;color:#fff;background:#173d49;box-shadow:0 10px 30px #173d4944;font-size:12px;opacity:0;pointer-events:none;transform:translate(-50%,14px);transition:.25s}.toast.is-visible{opacity:1;transform:translate(-50%,0)}.toast.is-error{background:#a4473b}body.auth-locked .shell,body.auth-locked .topbar{filter:blur(5px);pointer-events:none;user-select:none}
@keyframes auth-arrive{from{opacity:0;transform:translateY(18px) scale(.985)}to{opacity:1;transform:none}}@keyframes pulse{50%{box-shadow:0 0 0 7px #df9b4300}}
@media(max-width:900px){.sync-badge span{display:none}.user-pill b{display:none}.account-actions{gap:6px}.history-btn{padding:7px}.auth-card{grid-template-columns:270px 1fr}.auth-workspace{padding:40px 34px}}
@media(max-width:680px){.auth-gate{padding:12px;align-items:start;overflow:auto}.auth-card{display:block;width:100%;max-width:100%;min-width:0;min-height:0;margin:12px 0;border-radius:21px}.auth-story,.auth-workspace,.auth-form,.auth-tabs{min-width:0}.auth-story{min-height:160px;padding:23px}.auth-brand{margin-bottom:34px}.auth-constellation{position:absolute;right:-22px;top:-8px;transform:scale(.65)}.auth-copy p{margin-bottom:5px;font-size:24px}.auth-copy small{max-width:75%;font-size:10px;line-height:1.55}.auth-workspace{padding:29px 22px 25px}.auth-workspace h1{font-size:30px}.auth-subtitle{margin-bottom:20px}.code-row{grid-template-columns:minmax(0,1fr) auto;min-width:0}.code-row input{min-width:0}.account-actions .logout-btn{display:none!important}.user-pill{padding-right:5px}.history-btn{font-size:0}.history-btn span{font-size:16px}.topbar{gap:8px}.brand{min-width:0}.auth-footnote{font-size:9px}}

.local-code-card{position:relative;display:flex;align-items:center;gap:11px;padding:12px 12px 11px;border:1px solid #e6c28f;border-radius:11px;background:#fff8e9}.local-code-card[hidden]{display:none}.local-code-card>div{min-width:0}.local-code-card small{display:block;color:#aa7840;font:9px 'DM Mono';letter-spacing:.04em}.local-code-card strong{display:block;margin-top:3px;color:#8d5721;font:600 23px 'DM Mono';letter-spacing:.14em}.local-code-card button{margin-left:auto;padding:7px 9px;border:1px solid #e1ba7f;border-radius:8px;color:#956125;background:#fffdf7;font-size:10px;white-space:nowrap}.local-code-card p{position:absolute;left:12px;right:12px;bottom:-17px;margin:0;color:#a18159;font-size:9px;line-height:1.3}
 .offline-study-btn{width:100%;margin-top:14px;padding:11px 16px;border:1px solid #cbd9d3;border-radius:8px;background:#f5faf7;color:#285b4d;font:600 12px 'DM Mono';cursor:pointer}.offline-study-btn span{float:right}.offline-note{margin:8px 0 0;color:#82918d;font-size:10px;line-height:1.5;text-align:center}