@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;500;600;700&display=swap');
:root{--paper:#F3F4F1;--ink:#202522;--muted:#7B837D;--green:#294F4A;--mint:#E6EFEC;--gold:#987A40;--white:#FFFFFF;--line:#e1e5e0;--shadow:0 12px 40px rgba(35,52,45,.07);font-family:'Noto Sans TC','PingFang TC','Microsoft JhengHei',sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}html{min-width:320px;min-height:100%;background:var(--paper)}body{margin:0;min-width:320px;min-height:100vh;background:var(--paper)}button,input,select{font:inherit}button{color:inherit;cursor:pointer}.app-shell{min-height:100vh;max-width:1120px;margin:auto;padding:0 34px 96px}.topbar{height:82px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;color:var(--ink)}.brand-mark{width:38px;height:38px;display:grid;place-items:center;border-radius:12px;background:var(--green);color:white;font:italic 24px Georgia,serif}.brand b,.brand small{display:block}.brand b{font-size:15px;letter-spacing:.08em}.brand small{font:12px Georgia,serif;color:var(--muted);margin-top:3px}.offline-indicator{font-size:12px;color:var(--muted)}.offline-indicator i{display:inline-block;background:#688d6a;width:7px;height:7px;border-radius:50%;margin-right:5px}.main-content{max-width:850px;margin:0 auto;padding:40px 0 70px}.hero{background:var(--green);border-radius:22px;color:white;padding:38px 42px 34px;box-shadow:var(--shadow);position:relative;overflow:hidden}.hero:after{content:'A';position:absolute;right:42px;top:12px;font:italic 180px Georgia,serif;color:rgba(255,255,255,.045)}.eyebrow{font-size:10px;font-weight:600;letter-spacing:.18em;color:var(--gold);text-transform:uppercase}.hero .eyebrow{color:#c8d8d3}.hero h1,.section-head h1,.section-head h2{font-size:30px;line-height:1.3;font-weight:500;margin:10px 0 8px;letter-spacing:.03em}.hero>p{margin:0;color:#d5dfdb;font-size:14px}.hero-stats{display:flex;gap:52px;margin:31px 0 28px}.hero-stats div{display:grid;gap:3px}.hero-stats strong{font:31px Georgia,serif}.hero-stats span{color:#d5dfdb;font-size:11px}.primary,.secondary,.danger-outline,.file-button{border:0;border-radius:10px;padding:12px 19px;min-height:45px;font-size:14px;font-weight:600}.primary{background:#fff;color:var(--green);position:relative;z-index:1}.primary:hover{background:#edf3f0}.secondary{background:var(--mint);color:var(--green);border:1px solid #d5e2dc}.secondary:hover{background:#dceae5}.section-head{display:flex;align-items:end;justify-content:space-between;margin:40px 0 20px}.section-head h1,.section-head h2{font-size:24px;margin-bottom:0}.text-button{border:0;background:transparent;color:var(--green);font-size:13px;padding:8px 0}.overview-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.overview-grid article,.stats-grid article,.progress-card,.settings-card{background:var(--white);border:1px solid var(--line);border-radius:15px;padding:20px}.overview-grid article span,.overview-grid article b,.overview-grid article small{display:block}.overview-grid article span,.overview-grid article small{color:var(--muted);font-size:12px}.overview-grid article b{font:22px Georgia,serif;margin:10px 0 7px}.note,.subtle{color:var(--muted);font-size:12px;line-height:1.7}.note{margin:18px 2px}.bottom-nav{position:fixed;z-index:5;bottom:0;left:0;right:0;height:74px;padding:5px max(20px,calc((100vw - 640px)/2)) env(safe-area-inset-bottom);background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border-top:1px solid var(--line);display:flex;justify-content:space-between}.bottom-nav button{border:0;background:transparent;color:var(--muted);display:flex;flex:1;max-width:150px;align-items:center;justify-content:center;gap:5px;flex-direction:column;font-size:10px}.bottom-nav button.selected{color:var(--green);font-weight:600}.nav-icon{height:23px;font-size:21px;line-height:22px}.add-icon{width:26px;height:26px;border-radius:50%;background:var(--green);color:white;font-size:22px;line-height:26px}.study-top{display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:12px;margin-bottom:18px}.flashcard{position:relative;background:white;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);padding:40px clamp(20px,6vw,60px);min-height:390px}.card-type{font-size:10px;letter-spacing:.17em;color:var(--gold);font-weight:600}.sound{position:absolute;right:26px;top:25px;border:0;background:var(--mint);color:var(--green);border-radius:50%;width:42px;height:42px;font-size:17px}.prompt-en{font:clamp(36px,7vw,54px) Georgia,'Noto Serif',serif;color:var(--green);margin:60px 0 8px;overflow-wrap:anywhere}.pronunciation{font:15px Georgia,serif;color:var(--muted);margin-bottom:26px}.reveal{margin-top:20px}.meanings{margin:20px 0;line-height:1.85}.sense{border-top:1px solid #edf0ed;padding:13px 0}.sense:first-child{border-top:0}.sense ul{padding-left:25px;margin:6px 0}.sense li{padding:2px 0}.english{font-family:Georgia,'Noto Serif',serif}.meta,.source{font-size:12px;color:var(--muted)}.meta{margin:7px 0}.answer-area{max-width:430px;margin:28px 0 0}.prompt-zh{font-size:20px;line-height:1.8;margin:48px 0 22px}.answer-area input{width:100%;border:1px solid #cbd5cf;border-radius:10px;background:#fcfdfc;padding:14px 16px;font:22px Georgia,serif;outline-color:var(--green)}.answer-area .secondary{margin-top:12px}.answer{font-size:28px;color:var(--green);margin:20px 0}.extra{border-top:1px solid var(--line);padding-top:12px;margin-top:18px;font-size:13px;line-height:1.75}.extra h3{font-size:12px;color:var(--gold);font-weight:600;margin:0 0 8px}.extra small{color:var(--muted)}.chip{border:1px solid var(--line);background:#fafbf9;border-radius:16px;padding:5px 10px;font-size:12px;color:var(--green)}.rating-label{text-align:center;color:var(--muted);font-size:12px;margin:22px 0 11px}.rating-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.rating-grid button{background:white;border:1px solid var(--line);border-radius:12px;min-height:65px}.rating-grid button:hover{border-color:var(--green);background:var(--mint)}.rating-grid b,.rating-grid small{display:block}.rating-grid b{font-size:14px}.rating-grid small{font-size:10px;color:var(--muted);margin-top:3px}.keyboard-hint{text-align:center;color:#909891;font-size:11px;margin:17px 0}.session-progress{height:4px;background:#e2e8e3;border-radius:3px;margin-top:24px;overflow:hidden}.session-progress div{height:100%;background:var(--gold);transition:width .3s}.phase-card,.empty-state{text-align:center;background:white;border:1px solid var(--line);border-radius:20px;padding:55px 24px;box-shadow:var(--shadow)}.phase-card h1,.empty-state h2{font-weight:500}.phase-card p,.empty-state p{color:var(--muted);line-height:1.8}.phase-card strong{display:block;color:var(--green);margin:20px}.checkmark{font-size:46px;color:var(--green)}.search-box{height:50px;background:white;border:1px solid var(--line);border-radius:12px;display:flex;align-items:center;padding:0 14px;gap:10px}.search-box>span{font-size:24px;color:var(--muted)}.search-box input{border:0;outline:0;flex:1;min-width:0;background:transparent;font-size:13px}.search-box button{border:0;background:transparent;color:var(--muted);font-size:22px}.count{font-size:12px;color:var(--muted)}.library-list{margin-top:14px}.word-row{position:relative;background:white;border:1px solid var(--line);border-radius:14px;margin-bottom:10px;padding:18px 55px 17px 20px}.row-title{display:flex;align-items:center;gap:10px}.row-title .english{font-size:21px;color:var(--green);overflow-wrap:anywhere}.type-pill{border-radius:12px;padding:3px 8px;background:var(--mint);color:var(--green);font-size:10px}.row-pron{font:12px Georgia,serif;color:var(--muted);margin:3px 0 7px}.row-meaning{font-size:13px;line-height:1.7}.row-meaning .sense{padding:6px 0}.row-meaning .sense ul{margin:1px 0}.small-sound{right:14px;top:15px;width:34px;height:34px;font-size:14px}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.stats-grid article span,.stats-grid article b{display:block}.stats-grid article span{font-size:12px;color:var(--muted)}.stats-grid article b{font:27px Georgia,serif;color:var(--green);margin-top:12px}.progress-card{margin-top:14px}.progress-card h2,.settings-card h2{font-size:16px;font-weight:500;margin:0 0 15px}.progress-card h2:not(:first-child){margin-top:25px}.progress-card p{font-size:12px;color:var(--muted)}.bar{height:8px;border-radius:6px;background:#e8ece8;overflow:hidden}.bar i{display:block;height:100%;background:var(--green);border-radius:6px}.bar.gold i{background:var(--gold)}.settings-card{margin-bottom:14px}.settings-card>label:not(.toggle){display:flex;align-items:center;justify-content:space-between;gap:15px;padding:10px 0;color:#46514a;font-size:13px}.settings-card select{min-width:110px;padding:8px;border:1px solid var(--line);border-radius:8px;background:#fff}.toggle{display:flex;justify-content:space-between;align-items:center;padding:10px 0;font-size:13px}.toggle input{accent-color:var(--green);width:18px;height:18px}.settings-card p{font-size:12px;color:var(--muted);line-height:1.7}.button-row{display:flex;gap:10px;flex-wrap:wrap}.file-button{display:inline-grid;place-items:center;background:var(--mint);color:var(--green);border:1px solid #d5e2dc;cursor:pointer}.file-button input{display:none}.danger-outline{border:1px solid #c88b84;background:white;color:#9f4d44}.import-result{font-size:13px;color:var(--green);margin-top:10px}.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}#toast{position:fixed;z-index:20;left:50%;bottom:92px;transform:translate(-50%,15px);opacity:0;pointer-events:none;background:#263b35;color:white;padding:11px 16px;border-radius:10px;font-size:12px;max-width:min(90vw,480px);text-align:center;transition:.2s}#toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:650px){.app-shell{padding:0 17px 95px}.topbar{height:68px}.main-content{padding:24px 0 40px}.hero{padding:29px 22px 25px;border-radius:17px}.hero:after{right:16px;font-size:125px}.hero h1,.section-head h1,.section-head h2{font-size:25px}.hero-stats{gap:0;justify-content:space-between;margin:24px 0}.hero-stats strong{font-size:25px}.hero-stats span{font-size:10px}.overview-grid{gap:9px}.overview-grid article{padding:15px}.overview-grid article b{font-size:19px}.section-head{margin:30px 0 16px}.flashcard{min-height:350px;padding:28px 21px}.prompt-en{margin-top:62px}.sound{right:18px;top:18px}.prompt-zh{font-size:18px;margin-top:42px}.rating-grid{gap:6px}.rating-grid button{min-height:60px}.keyboard-hint{display:none}.stats-grid{grid-template-columns:repeat(2,1fr);gap:8px}.stats-grid article{padding:15px}.stats-grid article b{font-size:24px}.bottom-nav{height:70px}.offline-indicator{font-size:10px}.word-row{padding-left:14px}.row-title .english{font-size:19px}}
@media(max-width:380px){.app-shell{padding-left:12px;padding-right:12px}.hero{padding:25px 17px}.hero-stats strong{font-size:22px}.hero-stats span{font-size:9px}.rating-grid b{font-size:12px}.rating-grid small{font-size:9px}.brand small{font-size:11px}}
@media(min-width:900px){.main-content{padding-top:48px}.hero{padding:42px 48px}.flashcard{min-height:430px}}

/* ===== 後續修正新增：向量圖示、對話框、行動裝置高度 ===== */
/* 圖示：原本使用 emoji／特殊字元，改為 inline SVG 並沿用原本的尺寸與顏色。 */
.nav-icon{display:flex;align-items:center;justify-content:center}
.nav-icon svg{width:21px;height:21px;display:block}
.add-icon svg{width:15px;height:15px}
.sound{display:grid;place-items:center}
.sound svg{width:19px;height:19px;display:block}
.small-sound svg{width:15px;height:15px;display:block}
.search-box .search-icon{display:grid;place-items:center;color:var(--muted)}
.search-box .search-icon svg{width:19px;height:19px;display:block}
.search-box button{display:grid;place-items:center}
.search-box button svg{width:18px;height:18px;display:block}
.checkmark{display:grid;place-items:center}
.checkmark svg{width:44px;height:44px;display:block}

/* 離線指示燈：文字與顏色反映真實狀態（線上／離線／Service Worker 已註冊）。 */
.offline-indicator[data-state="online"] i{background:#b9a06a}
.offline-indicator[data-state="offline"] i{background:var(--gold)}

/* App 內對話框（取代 window.prompt） */
dialog.modal{border:1px solid var(--line);border-radius:16px;background:var(--white);color:var(--ink);width:min(92vw,440px);max-height:88vh;overflow:auto;padding:24px 22px;box-shadow:0 26px 60px rgba(35,52,45,.24);margin:auto}
dialog.modal::backdrop{background:rgba(32,37,34,.44)}
dialog.modal h2{font-size:17px;font-weight:600;margin:0 0 8px}
dialog.modal p{font-size:12.5px;color:var(--muted);line-height:1.75;margin:0 0 10px}
dialog.modal label{display:block;font-size:12px;color:var(--muted);margin:12px 0 5px}
dialog.modal input{width:100%;border:1px solid #cbd5cf;border-radius:9px;background:#fcfdfc;padding:11px 13px;font-size:15px;outline-color:var(--green)}
dialog.modal .button-row{margin-top:18px}
dialog.modal .text-button{padding:12px 4px}

/* 行動裝置瀏覽器工具列會讓 100vh 過高，造成底部 nav 遮住內容。 */
@supports (min-height:100dvh){
  body,.app-shell{min-height:100dvh}
}