:root {
  --bg:#070a13; --bg-elev:#0d1220; --bg-card:#111a2d; --bg-card-hi:#17243c;
  --line:#263b5e; --line-soft:#1a2a45;
  --ink:#eef7ff; --ink-mid:#9bb0ca; --ink-dim:#617590; --ink-faint:#3a4b66;
  --accent:#73f0d0; --accent-dim:#2d827e; --accent-soft:rgba(115,240,208,.12);
  --good:#82f7b1; --bad:#ff6f91; --info:#83b7ff; --warn:#ffbe63;
  --root:#b79aff; --syn:#73f0d0; --ant:#ff6f91;
  --syn-dim:rgba(115,240,208,.4); --ant-dim:rgba(255,111,145,.4); --root-dim:rgba(183,154,255,.4);
  --root-bg:rgba(180,140,255,.08); --root-border:rgba(180,140,255,.3);
  --syn-bg:rgba(110,211,168,.08); --syn-border:rgba(110,211,168,.3);
  --ant-bg:rgba(232,119,119,.08); --ant-border:rgba(232,119,119,.3);
  --shadow:0 18px 60px rgba(0,0,0,.5), 0 0 38px rgba(61,231,214,.06);
  --r-sm:8px; --r-md:12px; --r-lg:18px; --r-xl:24px;
  --tap:44px;
  --font:'Outfit','Noto Sans SC',-apple-system,BlinkMacSystemFont,sans-serif;
  --font-serif:'DM Serif Display','Noto Serif SC',Georgia,serif;
  --font-mono:'JetBrains Mono','SF Mono',Menlo,monospace;
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html,body{height:100%;overflow:hidden;overscroll-behavior:none}
body{font-family:var(--font);background:radial-gradient(circle at 50% -10%,#142b43 0,var(--bg) 44%),var(--bg);color:var(--ink);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased;user-select:none;padding-top:env(safe-area-inset-top);padding-bottom:env(safe-area-inset-bottom)}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,textarea{font-family:inherit;-webkit-user-select:text;user-select:text}
::-webkit-scrollbar{display:none}
::selection{background:var(--accent-soft);color:var(--accent)}
body::before{content:"";position:fixed;inset:0;pointer-events:none;opacity:.25;background-image:linear-gradient(rgba(115,240,208,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(115,240,208,.025) 1px,transparent 1px);background-size:32px 32px;mask-image:linear-gradient(to bottom,#000,transparent 80%)}
#app{display:grid;grid-template-rows:1fr auto;height:100dvh;max-width:480px;margin:0 auto;position:relative;background:linear-gradient(180deg,rgba(8,13,24,.72),transparent 42%)}
#view{overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;scroll-behavior:smooth;padding-bottom:100px}
.tabbar{display:grid;grid-template-columns:repeat(5,1fr);background:rgba(9,14,26,.94);border-top:1px solid rgba(115,240,208,.18);padding:6px 0 calc(6px + env(safe-area-inset-bottom));z-index:10;box-shadow:0 -10px 32px rgba(0,0,0,.28);backdrop-filter:blur(18px)}
.tab{display:flex;flex-direction:column;align-items:center;gap:2px;padding:8px 4px;color:var(--ink-dim);font-size:10px;font-weight:500;min-height:52px;transition:color .2s,transform .2s}
.tab svg{width:20px;height:20px}
.tab.active{color:var(--accent);text-shadow:0 0 16px rgba(115,240,208,.7)}
.tab.active svg{filter:drop-shadow(0 0 7px rgba(115,240,208,.75))}
.tab .badge{position:absolute;top:6px;margin-left:18px;background:var(--bad);color:#fff;font-size:9px;font-weight:700;border-radius:999px;padding:1px 5px;min-width:14px;text-align:center;box-shadow:0 0 12px rgba(255,111,145,.5)}

.top{position:sticky;top:0;z-index:5;background:linear-gradient(180deg,var(--bg) 60%,transparent);padding:14px 20px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.top h1{font-family:var(--font-serif);font-size:22px;font-weight:400;color:var(--ink);letter-spacing:-.03em;text-shadow:0 0 22px rgba(115,240,208,.16)}
.top .sub{font-size:11px;color:var(--accent);letter-spacing:.06em;text-transform:uppercase;margin-top:2px;opacity:.72}
.top-right{display:flex;gap:6px;align-items:center}
.icon-btn{width:36px;height:36px;border-radius:50%;background:var(--bg-card);display:inline-flex;align-items:center;justify-content:center;color:var(--ink-mid);border:1px solid var(--line-soft);transition:all .15s;box-shadow:inset 0 0 0 1px rgba(115,240,208,.03),0 0 0 rgba(115,240,208,0)}
.icon-btn:hover,.icon-btn:active{background:var(--bg-card-hi);color:var(--ink);border-color:var(--accent);box-shadow:0 0 18px rgba(115,240,208,.2)}
.icon-btn svg{width:18px;height:18px}
.speak-btn{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;border:1px solid var(--line);background:var(--bg-card);color:var(--accent);vertical-align:middle;margin-left:8px;flex-shrink:0;transition:background .15s,transform .1s;position:relative}
.speak-btn:hover,.speak-btn:active{background:var(--bg-card-hi);transform:scale(1.05)}
.speak-btn svg{width:18px;height:18px}
.speak-btn::before,.speak-btn::after{content:"";position:absolute;inset:-5px;border:1px solid rgba(115,240,208,.45);border-radius:50%;opacity:0;pointer-events:none}
.speak-btn.speaking::before{animation:ripple 1.5s ease-out infinite}
.speak-btn.speaking::after{animation:ripple 1.5s .5s ease-out infinite}
.speak-btn.speaking{box-shadow:0 0 0 5px rgba(115,240,208,.1),0 0 24px rgba(115,240,208,.55)}
.word-with-speak{display:flex;align-items:center;justify-content:center;gap:4px;flex-wrap:wrap}
@keyframes ripple { 0% { transform: scale(.75); opacity: .8; } 100% { transform: scale(1.9); opacity: 0; } }

.streak{display:inline-flex;align-items:center;gap:4px;background:var(--bg-card);border:1px solid var(--line-soft);border-radius:999px;padding:6px 10px;font-size:12px;font-weight:600;color:var(--accent);font-family:var(--font-mono);box-shadow:0 0 18px rgba(255,179,92,.1)}
.streak svg{width:14px;height:14px}

.section{padding:0 20px 24px}
.section-title{font-size:11px;font-weight:600;color:var(--ink-dim);letter-spacing:.12em;text-transform:uppercase;margin:24px 0 12px;display:flex;align-items:center;gap:8px}
.section-title::after{content:"";flex:1;height:1px;background:var(--line-soft)}
.card{background:var(--bg-card);border:1px solid var(--line-soft);border-radius:var(--r-lg);padding:16px;box-shadow:inset 0 0 22px rgba(115,240,208,.018)}
.card+.card{margin-top:10px}

.hero-card{background:linear-gradient(135deg,rgba(16,31,51,.96),rgba(19,29,55,.96));border:1px solid rgba(115,240,208,.24);border-radius:var(--r-xl);padding:22px 20px;position:relative;overflow:hidden;box-shadow:var(--shadow)}
.hero-card::before{content:"";position:absolute;top:-40px;right:-40px;width:160px;height:160px;background:radial-gradient(circle,var(--accent-soft) 0,transparent 70%);pointer-events:none}
.hero-card::after{content:"";position:absolute;inset:auto -30% -65% 20%;height:150px;background:radial-gradient(ellipse,rgba(115,240,208,.14),transparent 66%);pointer-events:none}
.hero-label{font-size:11px;color:var(--ink-dim);letter-spacing:.1em;text-transform:uppercase;margin-bottom:6px}
.hero-num{font-family:var(--font-serif);font-size:48px;line-height:1;color:var(--accent);margin-bottom:4px;text-shadow:0 0 26px rgba(115,240,208,.28)}
.hero-num .unit{font-family:var(--font);font-size:14px;color:var(--ink-mid);margin-left:6px}
.hero-desc{font-size:13px;color:var(--ink-mid);line-height:1.5;margin-top:6px;max-width:80%}
.hero-cta{display:inline-flex;align-items:center;gap:6px;margin-top:16px;background:var(--accent);color:var(--bg);font-weight:600;font-size:14px;padding:10px 18px;border-radius:999px;transition:transform .15s;box-shadow:0 0 22px rgba(115,240,208,.22);position:relative;overflow:hidden;border:none;cursor:pointer}
.hero-cta:hover{transform:translateY(-1px)}
.hero-cta::after{content:"";position:absolute;inset:0;background:linear-gradient(110deg,transparent 25%,rgba(255,255,255,.28),transparent 75%);transform:translateX(-120%);animation:shine 3.8s infinite}
.hero-cta svg{width:14px;height:14px}
@keyframes shine { 0%, 65% { transform: translateX(-120%); } 90%, 100% { transform: translateX(120%); } }

/* 卷切换导航 */
.vol-nav{display:flex;align-items:center;justify-content:space-between;gap:10px;background:var(--bg-card);border:1px solid var(--line-soft);border-radius:var(--r-lg);padding:12px 14px;box-shadow:inset 0 0 22px rgba(115,240,208,.018)}
.vol-nav .icon-btn{flex:0 0 auto}
.vol-nav-mid{flex:1;text-align:center;min-width:0}
.vol-nav-title{font-family:var(--font-mono);font-size:14px;font-weight:600;color:var(--ink);display:flex;align-items:center;justify-content:center;gap:6px}
.vol-nav-range{font-size:11px;color:var(--ink-dim);font-weight:400}
.vol-nav-cov{font-size:11px;color:var(--accent);margin-top:3px}
.vol-btn{flex:0 0 auto;width:36px;height:36px;border-radius:10px;border:1px solid var(--line-soft);background:var(--bg-card);color:var(--ink);font-size:15px;cursor:pointer;transition:all .15s}
.vol-btn:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}
.vol-btn:disabled{opacity:.35;cursor:default}
.vol-info{flex:1;text-align:center}
.vol-title{font-family:var(--font-mono);font-size:14px;font-weight:600;color:var(--ink)}
.vol-cov{font-size:11px;color:var(--accent);margin-top:3px}
/* 自动切换提示卡片 */
.auto-card{margin-top:12px;background:linear-gradient(135deg,rgba(255,179,92,.10),rgba(115,240,208,.08));border:1px solid rgba(255,179,92,.35);border-radius:var(--r-lg);padding:14px 16px}
.auto-card .auto-title{font-size:14px;font-weight:600;color:var(--warn);font-family:var(--font-serif)}
.auto-card .auto-desc{font-size:12px;color:var(--ink-mid);margin:6px 0 12px;line-height:1.5;font-family:'Noto Sans SC'}
.auto-card .auto-btns{display:flex;gap:8px}
.auto-card .auto-btns button{flex:1;border-radius:999px;padding:9px 12px;font-size:13px;font-weight:600;cursor:pointer;border:none;transition:transform .15s}
.auto-card .auto-go{background:var(--accent);color:var(--bg)}
.auto-card .auto-later{background:transparent;color:var(--ink-mid);border:1px solid var(--line-soft)!important}
.auto-card .auto-btns button:hover{transform:translateY(-1px)}
[data-theme="reading"] .vol-nav,[data-theme="reading"] .auto-card{background:#fffdf8;border-color:#e5dcc8}
[data-theme="reading"] .auto-card{background:linear-gradient(135deg,#fdf3df,#eefaf4);border-color:#e0c48a}

.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.stat{background:var(--bg-card);border:1px solid var(--line-soft);border-radius:var(--r-md);padding:12px;text-align:center;box-shadow:inset 0 0 22px rgba(115,240,208,.018)}
.stat .v{font-family:var(--font-mono);font-size:20px;font-weight:600;color:var(--ink)}
.stat .l{font-size:10px;color:var(--ink-dim);text-transform:uppercase;letter-spacing:.08em;margin-top:2px}
.stat.accent .v{color:var(--accent)}
.stat.bad .v{color:var(--bad)}
.stat.warn .v{color:var(--warn)}

.mission-list{display:grid;gap:10px}
.mission-row{display:flex;align-items:center;gap:12px;background:var(--bg-card);border:1px solid var(--line-soft);border-radius:var(--r-md);padding:12px 14px;box-shadow:inset 0 0 22px rgba(115,240,208,.018);transition:all .15s;cursor:pointer}
.mission-row:hover,.mission-row:active{border-color:rgba(115,240,208,.3);background:var(--bg-card-hi);transform:translateY(-1px);box-shadow:0 0 20px rgba(115,240,208,.1)}
.mission-icon{width:36px;height:36px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;font-size:18px}
.mission-icon.new{background:var(--accent-soft);color:var(--accent)}
.mission-icon.review{background:rgba(122,178,255,.14);color:var(--info)}
.mission-icon.risk{background:rgba(255,190,99,.14);color:var(--warn)}
.mission-icon.conf{background:rgba(255,111,145,.14);color:var(--bad)}
.mission-icon.root{background:var(--root-bg);color:var(--root)}
.mission-body{flex:1;min-width:0}
.mission-title{font-size:14px;font-weight:600;color:var(--ink);margin-bottom:2px}
.mission-desc{font-size:11px;color:var(--ink-dim);line-height:1.4}
.mission-meta{font-family:var(--font-mono);font-size:11px;color:var(--ink-mid);text-align:right;flex-shrink:0}
.mission-meta .num{font-size:16px;font-weight:700;color:var(--ink)}
.mission-meta .time{font-size:10px;color:var(--ink-dim);margin-top:2px}

.quick-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.quick{background:var(--bg-card);border:1px solid var(--line-soft);border-radius:var(--r-md);padding:14px;display:flex;flex-direction:column;gap:8px;transition:all .15s;min-height:96px;box-shadow:inset 0 0 22px rgba(115,240,208,.018);text-align:left}
.quick:hover,.quick:active{border-color:rgba(115,240,208,.3);background:var(--bg-card-hi);transform:translateY(-2px);box-shadow:0 0 20px rgba(115,240,208,.1)}
.quick-icon{width:32px;height:32px;border-radius:8px;background:var(--accent-soft);color:var(--accent);display:inline-flex;align-items:center;justify-content:center}
.quick-icon svg{width:16px;height:16px}
.quick-title{font-size:13px;font-weight:600;color:var(--ink)}
.quick-sub{font-size:11px;color:var(--ink-dim);margin-top:auto;font-family:var(--font-mono)}

/* Memory Strength bar */
.mem-bar{display:flex;align-items:center;gap:8px;padding:6px 0}
.mem-bar .lbl{font-size:12px;color:var(--ink-mid);width:120px;flex-shrink:0}
.mem-bar .track{flex:1;height:6px;background:var(--line-soft);border-radius:3px;overflow:hidden}
.mem-bar .fill{height:100%;border-radius:3px;transition:width .4s ease}
.mem-bar .val{font-family:var(--font-mono);font-size:12px;color:var(--ink);width:40px;text-align:right;flex-shrink:0}
.fill-lo{background:linear-gradient(90deg,#ff6f91,#ffbe63)}
.fill-md{background:linear-gradient(90deg,#ffbe63,#73f0d0)}
.fill-hi{background:linear-gradient(90deg,#73f0d0,#82f7b1)}

/* Cards / Flashcard */
.study-wrap{padding:0 20px 24px}
.flashcard{background:linear-gradient(145deg,#111d33 0%,#0c1528 100%);border:1px solid rgba(115,240,208,.3);border-radius:var(--r-xl);padding:24px 20px;position:relative;box-shadow:var(--shadow),inset 0 0 44px rgba(115,240,208,.025);overflow:hidden;transition:transform .35s,box-shadow .35s,border-color .35s;min-height:280px}
.flashcard::before{content:"";position:absolute;width:260px;height:260px;right:-110px;top:-120px;border-radius:50%;background:radial-gradient(circle,rgba(183,154,255,.18),transparent 68%);pointer-events:none}
.flashcard::after{content:"";position:absolute;left:12%;right:12%;bottom:0;height:1px;background:linear-gradient(90deg,transparent,var(--accent),transparent);opacity:.45}
.flashcard:hover{border-color:rgba(115,240,208,.55)}
.flashcard .word{font-family:var(--font-serif);font-size:42px;line-height:1.05;color:var(--ink);margin-bottom:8px;text-align:center;text-shadow:0 0 25px rgba(238,247,255,.12)}
.flashcard .pos,.back-word .pos{display:inline-block;font-size:10px;font-weight:600;color:var(--ink-dim);background:var(--bg-elev);border:1px solid var(--line);border-radius:4px;padding:3px 8px;font-family:var(--font-mono);text-transform:uppercase;letter-spacing:.08em;vertical-align:middle;margin-left:10px}
.flashcard .ipa{text-align:center;color:var(--accent);font-family:var(--font-mono);font-size:13px;margin-bottom:18px;opacity:.82}
.flashcard .dim-tag{display:inline-block;font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--info);background:rgba(122,178,255,.12);padding:3px 8px;border-radius:4px;font-weight:700;margin-bottom:14px}
.flashcard .def{font-size:15px;line-height:1.55;color:var(--ink);text-align:center;margin-bottom:8px}
.flashcard .def-cn{font-size:14px;color:var(--ink-mid);text-align:center;margin-bottom:24px;font-family:'Noto Sans SC'}
.flip-hint{text-align:center;font-size:11px;color:var(--ink-dim);margin-top:14px;letter-spacing:.06em}
.flip-hint kbd{display:inline-block;font-family:var(--font-mono);font-size:10px;background:var(--bg-elev);border:1px solid var(--line);border-radius:4px;padding:1px 5px;margin:0 2px}

/* Flashcard back */
.flash-back{padding:24px 20px}
.back-word-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;border-bottom:1px solid var(--line);padding-bottom:10px;margin-bottom:14px}
.back-word{font-family:var(--font-serif);font-size:30px;line-height:1.1;color:var(--ink);text-shadow:0 0 20px rgba(115,240,208,.14)}
.back-ipa{color:var(--accent);font-family:var(--font-mono);font-size:12px}
.back-def{color:var(--ink);font-size:14px;line-height:1.55}
.back-def-cn{color:var(--ink-mid);font-size:14px;line-height:1.55;margin-top:4px;margin-bottom:14px;font-family:'Noto Sans SC',sans-serif}
.row{display:grid;grid-template-columns:80px 1fr;gap:10px;font-size:13px;align-items:start;margin-bottom:8px}
.row .l{color:var(--ink-dim);font-size:10px;text-transform:uppercase;letter-spacing:.08em;font-weight:600;padding-top:3px}
.row .v{color:var(--ink)}
.row .v .chip{display:inline-block;background:var(--bg-elev);border:1px solid var(--line);border-radius:4px;padding:2px 6px;margin:0 4px 4px 0;font-size:12px;font-family:var(--font-mono)}
.row .v .chip.syn{background:var(--syn-bg);border-color:var(--syn-border);color:var(--syn)}
.row .v .chip.ant{background:var(--ant-bg);border-color:var(--ant-border);color:var(--ant)}
.row .v .chip.root{background:var(--root-bg);border-color:var(--root-border);color:var(--root)}
.example{background:var(--bg-elev);border-left:2px solid var(--accent);border-radius:0 var(--r-sm) var(--r-sm) 0;padding:10px 12px;font-size:13px;line-height:1.5;color:var(--ink-mid);font-style:italic;margin-top:6px}
.example.cn{border-left-color:var(--ink-dim);font-style:normal;color:var(--ink-dim);font-size:12px;margin-top:4px;font-family:'Noto Sans SC',sans-serif}
.mnemonic{background:var(--accent-soft);border:1px dashed var(--accent-dim);border-radius:var(--r-md);padding:10px 12px;font-size:12px;color:var(--accent);line-height:1.5;margin-top:10px}
.mnemonic .lbl{font-size:9px;letter-spacing:.1em;color:var(--accent-dim);text-transform:uppercase;font-weight:700;margin-bottom:2px}

/* Confidence buttons */
.confidence{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-top:16px;position:sticky;bottom:0;background:linear-gradient(180deg,transparent 0%,var(--bg) 30%);padding:14px 0 4px;z-index:4}
.conf-btn{display:flex;flex-direction:column;align-items:center;gap:3px;background:var(--bg-card);border:1px solid var(--line);border-radius:var(--r-md);padding:8px 4px;color:var(--ink-mid);font-size:10px;min-height:60px;transition:all .15s;cursor:pointer}
.conf-btn:hover,.conf-btn:active{background:var(--bg-card-hi);color:var(--ink);transform:scale(.97)}
.conf-btn .emoji{font-size:22px}
.conf-btn.c1{border-color:rgba(255,111,145,.3);color:var(--bad)}.conf-btn.c1:hover{background:rgba(255,111,145,.1)}
.conf-btn.c2{border-color:rgba(255,190,99,.3);color:var(--warn)}.conf-btn.c2:hover{background:rgba(255,190,99,.1)}
.conf-btn.c3{border-color:rgba(122,178,255,.3);color:var(--info)}.conf-btn.c3:hover{background:rgba(122,178,255,.1)}
.conf-btn.c4{border-color:rgba(130,247,177,.3);color:var(--good)}.conf-btn.c4:hover{background:rgba(130,247,177,.1)}

.study-actions{display:flex;gap:6px;margin-top:14px;position:sticky;bottom:0;background:linear-gradient(180deg,transparent 0%,var(--bg) 30%);padding:14px 0 4px;z-index:4}
.btn{height:var(--tap);border-radius:var(--r-md);font-size:13px;font-weight:600;display:inline-flex;align-items:center;justify-content:center;gap:6px;transition:all .15s;padding:0 12px;cursor:pointer}
.btn svg{width:14px;height:14px}
.btn.ghost{background:var(--bg-card);border:1px solid var(--line);color:var(--ink-mid)}
.btn.ghost:hover,.btn.ghost:active{background:var(--bg-card-hi);color:var(--ink)}
.btn.again{background:rgba(232,119,119,.12);color:var(--bad);border:1px solid rgba(232,119,119,.3)}
.btn.hard{background:rgba(255,190,99,.12);color:var(--warn);border:1px solid rgba(255,190,99,.3)}
.btn.good{background:rgba(130,247,177,.12);color:var(--good);border:1px solid rgba(130,247,177,.3)}
.btn.accent{background:var(--accent);color:var(--bg);border:1px solid var(--accent);box-shadow:0 0 22px rgba(115,240,208,.22)}
.btn:active{transform:scale(.96)}
.btn:disabled{opacity:.4;pointer-events:none}

/* Drill */
.quiz-wrap{padding:0 20px 24px}
.quiz-progress{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px;font-family:var(--font-mono);font-size:12px;color:var(--ink-dim)}
.progress-bar{height:3px;background:var(--line-soft);border-radius:2px;overflow:hidden;margin-bottom:18px}
.progress-bar .fill{height:100%;background:linear-gradient(90deg,var(--accent),#f5d59a);border-radius:2px;transition:width .3s;box-shadow:0 0 10px rgba(115,240,208,.7)}
.quiz-type{display:inline-block;font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);background:var(--accent-soft);padding:3px 8px;border-radius:4px;font-weight:700;margin-bottom:12px}
.quiz-type.l1{color:var(--info);background:rgba(122,178,255,.12)}
.quiz-type.l2{color:var(--accent);background:var(--accent-soft)}
.quiz-type.l3{color:var(--warn);background:rgba(255,190,99,.12)}
.quiz-type.l4{color:var(--bad);background:rgba(255,111,145,.12)}
.quiz-prompt{background:var(--bg-card);border:1px solid var(--line);border-radius:var(--r-lg);padding:18px;font-size:15px;line-height:1.7;color:var(--ink);margin-bottom:14px;font-family:Georgia,var(--font-serif)}
.quiz-hint{font-size:12px;color:var(--ink-dim);margin-bottom:14px;line-height:1.5;font-family:'Noto Sans SC',sans-serif}
.options{display:grid;gap:8px}
.opt{display:flex;align-items:center;gap:12px;background:var(--bg-card);border:1px solid var(--line);border-radius:var(--r-md);padding:12px 14px;text-align:left;width:100%;font-size:14px;color:var(--ink);transition:all .15s;min-height:50px;cursor:pointer;box-shadow:inset 0 0 22px rgba(115,240,208,.018)}
.opt:hover,.opt:active{background:var(--bg-card-hi);border-color:rgba(115,240,208,.3);transform:translateY(-1px);box-shadow:0 0 20px rgba(115,240,208,.1)}
.opt .letter{width:24px;height:24px;border-radius:50%;background:var(--bg-elev);border:1px solid var(--line);display:inline-flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-size:11px;color:var(--ink-dim);flex-shrink:0}
.opt.sel{border-color:var(--accent);background:var(--accent-soft)}
.opt.sel .letter{background:var(--accent);color:var(--bg);border-color:var(--accent)}
.opt.correct{border-color:var(--good);background:rgba(130,247,177,.1)}
.opt.correct .letter{background:var(--good);color:var(--bg);border-color:var(--good)}
.opt.wrong{border-color:var(--bad);background:rgba(255,111,145,.1)}
.opt.wrong .letter{background:var(--bad);color:#fff;border-color:var(--bad)}
.opt.disabled{pointer-events:none;opacity:.5}
.opt.disabled.correct,.opt.disabled.wrong,.opt.disabled.sel{opacity:1}
.feedback{margin-top:14px;padding:12px 14px;border-radius:var(--r-md);font-size:13px;line-height:1.55;display:none;font-family:'Noto Sans SC',sans-serif}
.feedback.show{display:block;animation:popIn .3s ease-out}
.feedback.good{background:rgba(130,247,177,.1);color:var(--good);border:1px solid rgba(130,247,177,.3)}
.feedback.bad{background:rgba(255,111,145,.1);color:var(--bad);border:1px solid rgba(255,111,145,.3)}
.feedback .why{margin-top:6px;color:var(--ink-mid);font-size:12px}
.feedback .ans{font-family:var(--font-mono);font-weight:600}
.quiz-actions{margin-top:16px;display:flex;gap:8px}
.quiz-actions .btn{flex:1}
@keyframes popIn { from { opacity: 0; transform: translateY(8px) scale(.98); } to { opacity: 1; transform: none; } }

/* Library */
.filter-row{display:flex;gap:6px;overflow-x:auto;margin:0 -20px 12px;padding:0 20px 4px;scrollbar-width:none}
.chip-btn{flex-shrink:0;background:var(--bg-card);border:1px solid var(--line-soft);border-radius:999px;padding:6px 12px;font-size:12px;color:var(--ink-mid);white-space:nowrap;transition:all .15s;cursor:pointer}
.chip-btn.active{background:var(--accent);color:var(--bg);border-color:var(--accent)}
.word-row{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;background:var(--bg-card);border:1px solid var(--line-soft);border-radius:var(--r-md);margin-bottom:6px;transition:all .15s;cursor:pointer;min-height:56px;box-shadow:inset 0 0 22px rgba(115,240,208,.018)}
.word-row:hover,.word-row:active{border-color:rgba(115,240,208,.3);background:var(--bg-card-hi);transform:translateY(-1px);box-shadow:0 0 20px rgba(115,240,208,.1)}
.word-row .w{font-family:var(--font-serif);font-size:17px;color:var(--ink);line-height:1.1}
.word-row .m{font-size:11px;color:var(--ink-dim);font-family:'Noto Sans SC',sans-serif;margin-top:3px;max-width:220px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.word-row .right{display:flex;align-items:center;gap:8px;flex-shrink:0}
.mastery-dot{width:8px;height:8px;border-radius:50%;background:var(--line)}
.mastery-dot.l1{background:rgba(255,111,145,.6)}
.mastery-dot.l2{background:rgba(255,190,99,.6)}
.mastery-dot.l3{background:rgba(122,178,255,.7)}
.mastery-dot.l4{background:var(--good)}
.bookmark{color:var(--accent)}

/* Roots */
.root-card{background:var(--bg-card);border:1px solid var(--line-soft);border-radius:var(--r-lg);padding:18px;margin-bottom:10px;cursor:pointer;transition:all .15s;box-shadow:inset 0 0 22px rgba(115,240,208,.018)}
.root-card:hover,.root-card:active{border-color:rgba(180,140,255,.3);background:var(--bg-card-hi);transform:translateY(-1px);box-shadow:0 0 20px rgba(183,154,255,.1)}
.root-morph{font-family:var(--font-serif);font-size:24px;color:var(--root);margin-bottom:4px;text-shadow:0 0 18px rgba(183,154,255,.16)}
.root-mean{font-size:12px;color:var(--ink-mid);margin-bottom:8px}
.root-origin{font-size:10px;color:var(--accent);margin-bottom:12px;font-family:var(--font-mono)}
.root-derivs{display:flex;flex-wrap:wrap;gap:6px}
.root-derivs .chip{background:var(--root-bg);border:1px solid var(--root-border);color:var(--root);border-radius:6px;padding:4px 8px;font-size:12px;font-family:var(--font-mono)}

/* Memory Health */
.health-card{background:linear-gradient(135deg,rgba(16,31,51,.96),rgba(19,29,55,.96));border:1px solid rgba(115,240,208,.24);border-radius:var(--r-xl);padding:20px;margin-bottom:14px;box-shadow:var(--shadow)}
.health-title{font-family:var(--font-serif);font-size:18px;color:var(--accent);margin-bottom:12px}
.health-grid{display:grid;gap:8px}

/* Debt list */
.debt-row{display:flex;align-items:center;gap:10px;padding:10px 12px;background:var(--bg-card);border:1px solid var(--line-soft);border-radius:var(--r-md);margin-bottom:6px;cursor:pointer;transition:all .15s}
.debt-row:hover,.debt-row:active{border-color:rgba(255,111,145,.3);background:var(--bg-card-hi)}
.debt-row .w{font-family:var(--font-serif);font-size:16px;color:var(--ink);width:120px;flex-shrink:0}
.debt-row .reason{font-size:11px;color:var(--ink-dim);flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.debt-row .bar{width:80px;height:6px;background:var(--line-soft);border-radius:3px;overflow:hidden;flex-shrink:0}
.debt-row .bar .fill{height:100%;background:linear-gradient(90deg,#ffbe63,#ff6f91);border-radius:3px}
.debt-row .v{font-family:var(--font-mono);font-size:12px;color:var(--bad);font-weight:600;width:30px;text-align:right;flex-shrink:0}

/* Confusion pair */
.conf-pair{background:var(--bg-card);border:1px solid var(--ant-border);border-radius:var(--r-md);padding:14px;margin-bottom:10px}
.conf-pair .head{display:flex;align-items:center;gap:8px;margin-bottom:8px}
.conf-pair .vs{font-family:var(--font-serif);font-size:18px;color:var(--ink)}
.conf-pair .vs .arrow{color:var(--bad);margin:0 6px;font-size:12px}
.conf-pair .why{font-size:12px;color:var(--ink-mid);font-family:'Noto Sans SC',sans-serif;line-height:1.55}

/* Modal / Toast / Empty / Loading */
.modal-mask{position:fixed;inset:0;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;z-index:100;opacity:0;pointer-events:none;transition:opacity .2s;padding:20px}
.modal-mask.show{opacity:1;pointer-events:auto}
.modal{background:var(--bg-elev);border:1px solid var(--line);border-radius:var(--r-xl);padding:20px;max-width:380px;width:100%;max-height:80vh;overflow-y:auto;transform:scale(.95);transition:transform .2s}
.modal-mask.show .modal{transform:scale(1)}
.modal h2{font-family:var(--font-serif);font-size:20px;margin-bottom:10px}
.modal p{color:var(--ink-mid);font-size:13px;line-height:1.6}
.modal .btns{display:flex;gap:8px;margin-top:16px}
.modal .btns .btn{flex:1}
.toast{position:fixed;top:20px;left:50%;transform:translateX(-50%) translateY(-20px);background:var(--bg-card-hi);border:1px solid var(--line);color:var(--ink);padding:10px 18px;border-radius:999px;font-size:13px;font-weight:500;z-index:200;opacity:0;pointer-events:none;transition:all .25s;box-shadow:var(--shadow)}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.empty{text-align:center;padding:60px 20px;color:var(--ink-dim)}
.empty .ic{width:56px;height:56px;border-radius:50%;background:var(--bg-card);display:inline-flex;align-items:center;justify-content:center;color:var(--ink-faint);margin-bottom:14px}
.empty .ic svg{width:24px;height:24px}
.empty h3{font-family:var(--font-serif);font-size:18px;color:var(--ink-mid);margin-bottom:6px}
.empty p{font-size:13px;line-height:1.5}
.loading{display:flex;flex-direction:column;align-items:center;justify-content:center;height:60vh;color:var(--ink-dim);gap:16px}
.spinner{width:36px;height:36px;border:3px solid var(--line);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin { to { transform: rotate(360deg); } }
.hidden{display:none!important}
.divider{height:1px;background:var(--line-soft);margin:14px 0}
.mono{font-family:var(--font-mono)}
.badge-pill{display:inline-block;font-size:10px;letter-spacing:.08em;text-transform:uppercase;padding:2px 8px;border-radius:999px;font-weight:700}
.badge-new{background:rgba(115,240,208,.14);color:var(--accent)}
.badge-due{background:rgba(122,178,255,.14);color:var(--info)}
.badge-risk{background:rgba(255,190,99,.14);color:var(--warn)}
.badge-conf{background:rgba(255,111,145,.14);color:var(--bad)}

.theme-toggle{position:fixed;bottom:calc(78px + env(safe-area-inset-bottom));right:max(14px,calc((100vw - 480px)/2 + 14px));z-index:20;width:38px;height:38px;border:1px solid var(--line);border-radius:50%;display:inline-flex;align-items:center;justify-content:center;color:var(--accent);background:rgba(13,18,32,.88);box-shadow:0 6px 22px rgba(0,0,0,.2);backdrop-filter:blur(12px);transition:transform .18s}
.theme-toggle:hover{transform:translateY(-1px)}
.theme-toggle:active{transform:scale(.94)}
.theme-toggle svg{width:18px;height:18px}

/* Reading theme */
[data-theme="reading"]{
  --bg:#f4f0e8;--bg-elev:#fbfaf7;--bg-card:#fffdf8;--bg-card-hi:#f1ece2;
  --line:#d8d0c2;--line-soft:#e8e1d6;--ink:#263238;--ink-mid:#5f6b70;--ink-dim:#879093;--ink-faint:#b5bbb8;
  --accent:#147d79;--accent-dim:#6aa5a0;--accent-soft:rgba(20,125,121,.1);--good:#31875e;--bad:#c55362;--info:#4f7da6;--warn:#c98c3a;
  /* 同义/反义/词根:深色版本,在浅米背景上对比度 ≥ 5.5 */
  --syn:#196740;--ant:#9c2e3e;--root:#5e3d8e;
  --syn-dim:rgba(25,103,64,.5);--ant-dim:rgba(156,46,62,.5);--root-dim:rgba(94,61,142,.5);
  --syn-bg:rgba(25,103,64,.08);--syn-border:rgba(25,103,64,.32);
  --ant-bg:rgba(156,46,62,.08);--ant-border:rgba(156,46,62,.32);
  --root-bg:rgba(94,61,142,.08);--root-border:rgba(94,61,142,.32);
  --shadow:0 14px 40px rgba(83,72,55,.12);
}
[data-theme="reading"] body{background:linear-gradient(180deg,#e9e3d8 0%,var(--bg) 42%),var(--bg);color:var(--ink)}
[data-theme="reading"] body::before{opacity:.12}
[data-theme="reading"] #app{background:linear-gradient(180deg,rgba(255,253,248,.65),transparent 42%)}
[data-theme="reading"] .tabbar{background:rgba(251,250,247,.94);border-top-color:var(--line);box-shadow:0 -8px 28px rgba(83,72,55,.08)}
[data-theme="reading"] .hero-card,[data-theme="reading"] .flashcard,[data-theme="reading"] .health-card{background:linear-gradient(145deg,#fffdf8,#f8f3ea);border-color:var(--line)}
[data-theme="reading"] .top h1,[data-theme="reading"] .flashcard .word,[data-theme="reading"] .back-word,[data-theme="reading"] .root-morph{text-shadow:none}
[data-theme="reading"] .theme-toggle{background:rgba(255,253,248,.92);box-shadow:0 6px 22px rgba(83,72,55,.14)}

@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}}

/* ============ Core 2284 V3 · 组件层 ============ */
.section-title{font-size:13px;letter-spacing:.12em;color:var(--ink-faint);text-transform:uppercase;font-weight:600;margin:6px 4px 10px}
.card-title{font-size:14px;font-weight:700;color:var(--ink);margin-bottom:10px;display:flex;align-items:center;gap:6px}
.panel{margin-bottom:14px}
.health-hero{background:linear-gradient(135deg,var(--bg-card-hi),var(--bg-card));border:1px solid var(--line-soft);border-radius:var(--r-xl);padding:20px;text-align:center;margin-bottom:14px}
.hero-num{font-family:var(--font-serif);font-size:56px;line-height:1;font-weight:600;color:var(--ink);text-shadow:0 0 30px rgba(115,240,208,.35)}
.health-hero .unit{font-size:16px;color:var(--ink-faint);font-family:var(--font-mono);margin-left:4px}
.hero-desc{font-size:12px;color:var(--ink-faint);margin-top:8px}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:14px}
.stat{background:var(--bg-card);border:1px solid var(--line-soft);border-radius:var(--r-md);padding:12px 6px;text-align:center}
.stat-num{font-family:var(--font-mono);font-size:24px;font-weight:600;color:var(--accent)}
.stat-label{font-size:11px;color:var(--ink-faint);margin-top:2px}
.mission-list{display:flex;flex-direction:column;gap:8px;margin:4px 0 10px}
.mission-row{display:flex;align-items:center;gap:12px;background:var(--bg-card);border:1px solid var(--line-soft);border-radius:var(--r-md);padding:12px 14px;transition:all .15s}
.mission-row.rescue{border-color:color-mix(in srgb,var(--warn) 45%,transparent)}
.mission-row.learn{border-color:color-mix(in srgb,var(--accent) 30%,transparent)}
.mission-row.confuse{border-color:color-mix(in srgb,var(--info) 35%,transparent)}
.mission-meta{display:flex;flex-direction:column;min-width:56px}
.mission-meta .num{font-family:var(--font-mono);font-size:22px;font-weight:600;color:var(--ink)}
.mission-meta .time{font-size:11px;color:var(--ink-faint);text-transform:uppercase;letter-spacing:.08em}
.mission-desc{font-size:12px;color:var(--ink-dim)}
.time-budget{margin:2px 0 14px;text-align:center}
.time-budget-label{font-size:11px;color:var(--ink-faint);text-transform:uppercase;letter-spacing:.1em}
.time-budget-num{font-family:var(--font-serif);font-size:26px;color:var(--accent);text-shadow:0 0 18px rgba(115,240,208,.25)}
.time-budget-sub{font-size:12px;color:var(--ink-faint);margin-top:2px}

/* ---- 卡片会话 ---- */
.session-card{padding:20px;max-width:560px;margin:0 auto}
.task-chip{display:inline-block;font-size:11px;font-weight:600;letter-spacing:.08em;color:var(--accent);background:color-mix(in srgb,var(--accent) 10%,transparent);border:1px solid color-mix(in srgb,var(--accent) 30%,transparent);border-radius:999px;padding:4px 10px;margin-bottom:12px}
.session-progress{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.progress-track{flex:1;height:6px;border-radius:999px;background:var(--bg-elev);overflow:hidden}
.progress-fill{height:100%;background:linear-gradient(90deg,var(--accent),var(--info));border-radius:999px;transition:width .3s}
.progress-num{font-family:var(--font-mono);font-size:12px;color:var(--ink-faint)}
.q-word{font-family:var(--font-serif);font-size:38px;font-weight:600;color:var(--ink);line-height:1.2;display:inline-block}
.q-phonetic{font-family:var(--font-mono);color:var(--ink-dim);font-size:13px;margin:6px 0 4px}
.q-prompt{font-size:14px;color:var(--ink-mid);margin:16px 0 12px}
.q-context{font-family:var(--font-serif);font-size:19px;color:var(--ink);background:var(--bg-elev);border:1px solid var(--line-soft);border-radius:var(--r-md);padding:14px;margin:8px 0}
.q-excn{font-size:13px;color:var(--ink-dim);margin-bottom:10px}
.ans-translation{font-size:19px;color:var(--ink);margin:2px 0}
.ans-definition{font-size:14px;color:var(--ink-mid);margin-top:4px}
.opt-grid{display:flex;flex-direction:column;gap:10px}
.opt-btn{background:var(--bg-card);border:1px solid var(--line);border-radius:var(--r-md);padding:14px 16px;font-size:15px;color:var(--ink);cursor:pointer;text-align:left;transition:all .14s}
.opt-btn:hover,.opt-btn:active{border-color:var(--accent);background:var(--bg-card-hi)}
.opt-btn.ok{border-color:var(--good);color:var(--good)}
.opt-btn.bad{border-color:var(--warn);color:var(--warn)}
.soft-btn{background:var(--bg-elev);border:1px dashed var(--line);border-radius:var(--r-md);padding:12px;color:var(--accent);cursor:pointer;width:100%;margin:8px 0}
.self-row{display:flex;gap:10px;margin-top:14px}
.self-row .opt-btn{flex:1;text-align:center;font-weight:600}
.feedback{margin-top:14px;padding:12px;border-radius:var(--r-md);font-size:14px;font-weight:600;animation:fbIn .25s}
.feedback.ok{background:color-mix(in srgb,var(--good) 12%,transparent);color:var(--good);border:1px solid color-mix(in srgb,var(--good) 40%,transparent)}
.feedback.bad{background:color-mix(in srgb,var(--warn) 12%,transparent);color:var(--warn);border:1px solid color-mix(in srgb,var(--warn) 40%,transparent)}
@keyframes fbIn{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
.why-link{font-size:12px;color:var(--accent);cursor:pointer;margin-left:auto}
.session-done{text-align:center;padding:30px 20px}
.done-title{font-family:var(--font-serif);font-size:24px;color:var(--accent);margin-bottom:16px}
.done-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:14px}

/* ---- 混淆对 ---- */
.confuse-duo{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:10px}
.confuse-item{background:var(--bg-elev);border:1px solid var(--line-soft);border-radius:var(--r-md);padding:12px}
.confuse-item .q-word{font-size:24px}
.confuse-link{color:var(--info);font-size:14px;margin:0 4px}

/* ---- 六维条 ---- */
.dim-row{display:flex;align-items:center;gap:8px;margin:6px 0}
.dim-label{width:92px;font-size:12px;color:var(--ink-mid);flex-shrink:0}
.dim-track{flex:1;height:8px;border-radius:999px;background:var(--bg-elev);overflow:hidden}
.dim-fill{height:100%;border-radius:999px;background:linear-gradient(90deg,var(--accent-dim),var(--accent));min-width:2px}
.dim-fill.risk{background:linear-gradient(90deg,var(--warn),var(--bad))}
.dim-val{width:32px;text-align:right;font-family:var(--font-mono);font-size:12px;color:var(--ink-faint)}

/* ---- Drill ---- */
.drill-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.drill-card{background:var(--bg-card);border:1px solid var(--line-soft);border-radius:var(--r-md);padding:16px;text-align:left;cursor:pointer;transition:all .15s;color:inherit;width:100%}
.drill-card:hover,.drill-card:active{border-color:var(--accent);background:var(--bg-card-hi);transform:translateY(-1px)}
.drill-label{font-weight:700;font-size:16px;color:var(--ink)}
.drill-desc{font-size:12px;color:var(--ink-faint);margin-top:4px}

/* ---- Roots ---- */
.search-bar{margin-bottom:12px}
.search-input{width:100%;background:var(--bg-card);border:1px solid var(--line-soft);border-radius:var(--r-md);padding:12px 14px;color:var(--ink);font-size:14px}
.search-input:focus{outline:none;border-color:var(--accent)}
.root-grid{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
.root-chip{display:inline-flex;flex-direction:column;gap:2px;background:var(--bg-card);border:1px solid var(--line-soft);border-radius:var(--r-md);padding:8px 12px;cursor:pointer;text-align:left}
.root-chip:hover{border-color:var(--root-border);background:var(--root-bg)}
.root-chip b{color:var(--root);font-family:var(--font-mono);font-size:14px}
.root-meaning{font-size:11px;color:var(--ink-faint)}
.root-origin{font-size:11px;color:var(--root-dim);margin-left:6px}
.root-detail-title{display:flex;align-items:baseline;gap:8px;margin-bottom:12px}
.chip-row{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}
.word-chip{display:inline-block;background:var(--bg-elev);border:1px solid var(--line-soft);border-radius:999px;padding:4px 10px;font-size:12px;color:var(--ink);cursor:pointer}
.word-chip:hover{border-color:var(--accent);color:var(--accent)}
.word-chip.off{opacity:.4;cursor:default}
.root-examples{font-size:12px;color:var(--ink-dim);line-height:1.8}
.root-ex:not(:last-child)::after{content:" · ";color:var(--ink-faint)}

/* ---- Stats ---- */
.coverage-bar{height:10px;border-radius:999px;background:var(--bg-elev);overflow:hidden;margin:6px 0}
.coverage-fill{height:100%;background:linear-gradient(90deg,var(--accent),var(--info));border-radius:999px}
.risk-row{display:flex;align-items:center;gap:8px;margin:7px 0}
.h-row{display:flex;align-items:center;gap:10px;padding:7px 0;border-bottom:1px solid var(--line-soft);font-size:13px}
.h-row.bad .h-result{color:var(--warn)}
.h-time{font-family:var(--font-mono);font-size:11px;color:var(--ink-faint);width:52px}
.h-task{font-size:12px;color:var(--ink-mid);flex:1}
.h-result{font-family:var(--font-mono);font-weight:600}
.empty-hint{padding:14px;color:var(--ink-faint);font-size:13px;text-align:center}

/* ---- 浮层 ---- */
.modal-wrap{position:fixed;inset:0;background:rgba(4,8,16,.7);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:60;padding:20px}
.modal-box{background:var(--bg-elev);border:1px solid var(--line);border-radius:var(--r-xl);padding:20px;max-width:420px;width:100%;max-height:80vh;overflow:auto;box-shadow:var(--shadow)}
.modal-box.wide{max-width:560px}
.modal-title{font-size:15px;font-weight:700;margin-bottom:12px;color:var(--ink)}
.why-body p{margin:8px 0;font-size:14px;color:var(--ink-mid)}
.why-body b{color:var(--ink)}
.word-detail .card-title{margin-top:12px}
.toast{position:fixed;left:50%;bottom:84px;transform:translateX(-50%) translateY(8px);background:var(--bg-card-hi);border:1px solid var(--line);color:var(--ink);font-size:14px;padding:12px 20px;border-radius:999px;box-shadow:var(--shadow);opacity:0;transition:all .25s;z-index:80;pointer-events:none;max-width:84vw;text-align:center}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---- 首次功能导引（Onboarding） ---- */
.onb-overlay{position:fixed;inset:0;background:rgba(4,8,16,.78);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:70;padding:20px;animation:viewIn .22s}
.onb-card{background:var(--bg-elev);border:1px solid var(--line);border-radius:var(--r-xl);padding:22px;max-width:420px;width:100%;max-height:84vh;overflow:auto;box-shadow:var(--shadow)}
.onb-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.onb-x{width:30px;height:30px;border-radius:50%;background:var(--bg-card);border:1px solid var(--line-soft);color:var(--ink-dim);font-size:13px;display:inline-flex;align-items:center;justify-content:center}
.onb-x:active{color:var(--accent)}
.onb-dots{display:flex;gap:6px;align-items:center}
.onb-dot{width:8px;height:8px;border-radius:999px;background:var(--line-soft);transition:all .2s}
.onb-dot.active{background:var(--accent);width:22px;box-shadow:0 0 10px rgba(115,240,208,.5)}
.onb-icon{font-size:34px;line-height:1;margin-bottom:8px;color:var(--accent)}
.onb-title{font-family:var(--font-serif);font-size:21px;font-weight:400;color:var(--ink);margin-bottom:6px}
.onb-intro{font-size:13px;color:var(--ink-mid);margin-bottom:12px;line-height:1.6}
.onb-body{display:flex;flex-direction:column;gap:8px;margin-bottom:14px}
.onb-line{display:flex;gap:8px;align-items:flex-start;font-size:13.5px;color:var(--ink-mid);line-height:1.55}
.onb-bullet{width:6px;height:6px;border-radius:999px;background:var(--accent-dim);margin-top:8px;flex:none}
.onb-stepnum{font-family:var(--font-mono);font-size:11px;color:var(--ink-faint);text-align:center;margin-bottom:10px;letter-spacing:.08em}
.onb-foot{display:flex;gap:10px}
.onb-foot .soft-btn{flex:1;margin:0}
.onb-foot .hero-cta{flex:2;margin:0}
.onb-skip{color:var(--ink-dim)!important;border-style:solid!important}

/* ---- 主题适配（reading） ---- */
[data-theme="reading"] .health-hero{background:linear-gradient(135deg,#fdf3df,#eefaf4);border-color:#e0c48a}
[data-theme="reading"] .q-context{background:#fffdf6;border-color:#e5dcc8}
[data-theme="reading"] .opt-btn:hover{border-color:#b8933f;background:#fdf3df}
[data-theme="reading"] .dim-fill{background:linear-gradient(90deg,#9a7b3a,#c49a4e)}
[data-theme="reading"] .root-chip:hover{border-color:#b8933f;background:#fdf3df}
[data-theme="reading"] .search-input{background:#fffdf8}
[data-theme="reading"] .modal-box{background:#fffdf8;border-color:#e5dcc8}
[data-theme="reading"] .progress-fill{background:linear-gradient(90deg,#9a7b3a,#3a8a6b)}
[data-theme="reading"] .onb-card{background:#fffdf8;border-color:#e5dcc8}

/* 窄屏适配 */
@media (max-width:420px){.stat-grid{grid-template-columns:repeat(2,1fr)}.drill-grid{grid-template-columns:1fr}.q-word{font-size:32px}}

/* ---- 视图切换 / 基础 ---- */
.view{display:none}
.view:not([hidden]){display:block;animation:viewIn .22s}
.view.active{display:block;animation:viewIn .22s}
@keyframes viewIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.tab-btn.active{color:var(--accent);border-color:var(--accent)}
.reveal-btn{display:block;width:100%;background:var(--accent);color:#04101a;font-weight:700;border:none;border-radius:var(--r-md);padding:14px;font-size:15px;cursor:pointer;margin-top:14px}
.reveal-btn:active{opacity:.85}