:root {
  --navy:#FFF6EE; --navy-2:#E8D5CA; --sky:#D64B3C; --violet:#8C6B9C; --teal:#4D9B8A;
  --gold:#D5A84B; --coral:#E0735E; --paper:#171313; --paper-2:#211817; --white:#FFFFFF;
  --ink:#FFF7F2; --muted:#C5ABA3; --line:#49302C; --soft:#2B1E1C; --good:#55B88C; --bad:#F06C78;
  --surface:#241A19; --surface-2:#1B1514; --shadow:0 18px 50px rgba(0,0,0,.34);
  --radius:16px; --radius-sm:10px; --sidebar:288px; --max:1440px;
  font-family:'Bricolage Grotesque',ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  color-scheme:dark;
}
:root[data-theme="dark"]{color-scheme:dark}
:root[data-theme="light"]{--paper:#FBF6F2;--paper-2:#FFFFFF;--ink:#2B1B19;--muted:#6F5751;--line:#E8DAD4;--soft:#F8ECE7;--surface:#FFFFFF;--surface-2:#FCF7F4;--navy:#351C18;--navy-2:#71443C;--shadow:0 16px 46px rgba(84,37,29,.10);color-scheme:light}
*{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;background:var(--paper);color:var(--ink);min-width:0} body::before{content:"";position:fixed;inset:0;z-index:0;background:radial-gradient(90% 60% at 50% -10%,rgba(214,75,60,.12),transparent 55%),radial-gradient(60% 40% at 0% 50%,rgba(213,168,75,.06),transparent 55%),radial-gradient(70% 50% at 100% 80%,rgba(117,88,166,.06),transparent 55%);pointer-events:none} button,input,select,textarea{font:inherit} button,a{-webkit-tap-highlight-color:transparent} img,svg{max-width:100%} [lang="zh-Hans"],.hanzi{font-family:"Microsoft YaHei","PingFang SC","Noto Sans CJK SC",SimSun,sans-serif}
a{color:inherit}.skip-link{position:fixed;left:14px;top:-70px;z-index:1000;background:var(--surface);padding:12px 16px;border-radius:10px;box-shadow:var(--shadow)}.skip-link:focus{top:14px}
:focus-visible{outline:3px solid #79cabe;outline-offset:3px}.boot{min-height:100svh;display:grid;place-content:center;text-align:center;gap:16px;color:var(--muted)}
.brand-mark{display:grid;place-items:center;width:42px;height:42px;padding:4px;border-radius:12px;background:linear-gradient(145deg,#D64B3C,#9E3028);box-shadow:0 8px 22px rgba(198,67,53,.28);position:relative;overflow:hidden}.brand-mark::after{content:"";position:absolute;inset:8px;border:1px solid rgba(246,216,168,.72)}.brand-mark span{position:relative;z-index:1;display:grid;place-items:center;width:30px;height:30px;font:800 23px/1 "Microsoft YaHei",sans-serif;color:white}.boot .brand-mark{margin:auto;width:54px;height:54px}.boot .brand-mark span{font-size:30px}
.shell{position:relative;z-index:1;max-width:var(--max);margin:auto;min-height:100svh;display:grid;grid-template-columns:var(--sidebar) minmax(0,1fr)}
.sidebar{position:sticky;top:0;height:100svh;padding:24px 18px;border-right:1px solid var(--line);background:color-mix(in srgb,var(--paper-2) 96%,transparent);overflow:auto;z-index:20}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;padding:2px 6px 20px}.brand-copy{display:grid;gap:2px}.brand-copy b{font-size:15px;line-height:1.1}.brand-copy small{font-size:11px;color:var(--muted);letter-spacing:.04em}
.level-picker{display:grid;gap:5px;margin:0 4px 20px;padding:12px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}.level-picker label{font-size:10px;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);font-weight:800}.level-picker strong{font-size:14px}.level-picker small{font-size:11px;color:var(--muted)}.level-picker select,.select,.input{width:100%;min-height:44px;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:11px;padding:9px 11px}
.nav{display:grid;gap:5px}.nav-group{font-size:10px;text-transform:uppercase;letter-spacing:.14em;color:var(--muted);font-weight:800;padding:18px 12px 7px}.nav a{display:flex;align-items:center;gap:11px;min-height:46px;padding:10px 12px;border:1px solid transparent;border-radius:12px;color:var(--muted);text-decoration:none;font-weight:700;font-size:14px}.nav a:hover{color:var(--ink);background:var(--surface);border-color:var(--line)}.nav a[aria-current="page"]{color:var(--ink);background:var(--surface);border-color:var(--line);box-shadow:inset 3px 0 0 var(--level-color,var(--sky))}.nav-icon{width:22px;text-align:center;font-size:17px}
.sidebar-foot{margin:22px 4px 0;padding:14px;border:1px solid var(--line);border-radius:14px;background:var(--surface-2)}.sidebar-foot small{display:block;color:var(--muted);margin-bottom:5px}.sidebar-foot b{font-size:20px}.mini-progress{height:6px;background:var(--line);border-radius:99px;overflow:hidden;margin-top:10px}.mini-progress span{display:block;height:100%;background:var(--level-color,var(--sky));border-radius:inherit}
.content-wrap{min-width:0}.mobile-top{display:none}.main{width:min(100%,1120px);padding:34px clamp(24px,4vw,58px) 100px;margin:auto}.page-head{display:flex;align-items:flex-start;justify-content:space-between;gap:24px;margin-bottom:28px}.eyebrow{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--level-color,var(--sky));font-weight:850;margin:0 0 8px}.page-head h1,.hero h1{font-size:clamp(30px,4vw,48px);letter-spacing:-.04em;line-height:1.02;margin:0;color:var(--navy)}.page-head p{max-width:68ch;margin:10px 0 0;color:var(--muted);line-height:1.6}.top-actions{display:flex;gap:8px;flex:none}.icon-button,.button{border:1px solid var(--line);border-radius:11px;background:var(--surface);color:var(--ink);min-height:44px;padding:10px 14px;cursor:pointer;font-weight:750;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px}.icon-button{width:44px;padding:0}.button:hover,.icon-button:hover{border-color:var(--level-color,var(--sky));transform:translateY(-1px)}.button.primary{background:var(--level-color,var(--sky));border-color:transparent;color:white;box-shadow:0 8px 24px color-mix(in srgb,var(--level-color,var(--sky)) 30%,transparent)}.button.ghost{background:transparent}.button.danger{color:var(--bad)}.button.small{min-height:36px;padding:7px 10px;font-size:13px}.button[disabled]{opacity:.45;cursor:not-allowed;transform:none}
.hero{position:relative;overflow:hidden;padding:clamp(26px,5vw,48px);border:1px solid color-mix(in srgb,var(--level-color,var(--sky)) 28%,var(--line));border-radius:24px;background:linear-gradient(140deg,color-mix(in srgb,var(--level-color,var(--sky)) 10%,var(--surface)),var(--surface) 62%);box-shadow:var(--shadow);margin-bottom:24px}.hero::after{content:"";position:absolute;right:-55px;top:-70px;width:240px;height:240px;border-radius:50%;background:color-mix(in srgb,var(--level-color,var(--sky)) 10%,transparent)}.hero>*{position:relative;z-index:1}.hero p{max-width:65ch;color:var(--muted);line-height:1.65;font-size:16px}.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}
.grid{display:grid;gap:16px}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.grid.four{grid-template-columns:repeat(4,minmax(0,1fr))}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:0 8px 28px rgba(0,0,0,.12);min-width:0}.card h2,.card h3{margin:0 0 9px;color:var(--navy);letter-spacing:-.02em}.card p{color:var(--muted);line-height:1.55;margin:0}.card-link{text-decoration:none;transition:.18s ease}.card-link:hover{border-color:var(--level-color,var(--sky));transform:translateY(-2px);box-shadow:var(--shadow)}
.metric{display:grid;gap:6px}.metric-label{color:var(--muted);font-size:12px;font-weight:700}.metric-value{font-size:clamp(24px,4vw,34px);font-weight:850;color:var(--navy);letter-spacing:-.04em}.metric-note{font-size:12px;color:var(--muted)}
.section-title{display:flex;justify-content:space-between;align-items:end;gap:16px;margin:34px 0 14px}.section-title h2{margin:0;color:var(--navy);font-size:22px;letter-spacing:-.025em}.section-title p{margin:4px 0 0;color:var(--muted);font-size:13px}.section-title a{font-size:13px;color:var(--level-color,var(--sky));font-weight:800;text-decoration:none}
.module-card{display:grid;gap:14px}.module-top{display:flex;justify-content:space-between;gap:12px}.module-number{width:36px;height:36px;border-radius:11px;display:grid;place-items:center;background:var(--soft);color:var(--level-color,var(--sky));font-weight:850}.module-progress{font-size:12px;color:var(--muted)}.lesson-mini{display:grid;gap:7px}.lesson-mini a{display:flex;align-items:center;gap:8px;color:var(--muted);text-decoration:none;font-size:13px}.lesson-mini a:hover{color:var(--ink)}.lesson-dot{width:8px;height:8px;border:1px solid var(--line);border-radius:50%;flex:none}.lesson-dot.done{background:var(--good);border-color:var(--good)}
.filters{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-bottom:18px}.search{grid-column:span 2}.lesson-list{display:grid;gap:10px}.lesson-row{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:14px;padding:15px 16px;border:1px solid var(--line);border-radius:14px;background:var(--surface);text-decoration:none}.lesson-row:hover{border-color:var(--level-color,var(--sky))}.lesson-index{width:36px;height:36px;border-radius:10px;display:grid;place-items:center;background:var(--soft);font-weight:850;color:var(--level-color,var(--sky))}.lesson-copy b{display:block}.lesson-copy small{color:var(--muted)}.lesson-meta{text-align:right;color:var(--muted);font-size:12px}.pill{display:inline-flex;align-items:center;gap:5px;border:1px solid var(--line);border-radius:999px;padding:5px 9px;font-size:11px;color:var(--muted);background:var(--surface)}.pill.good{color:var(--good);border-color:color-mix(in srgb,var(--good) 35%,var(--line))}.pill.bad{color:var(--bad)}
.breadcrumb{display:flex;gap:7px;align-items:center;color:var(--muted);font-size:13px;margin-bottom:20px}.breadcrumb a{text-decoration:none}.lesson-article{display:grid;gap:18px}.learning-box{border-left:4px solid var(--level-color,var(--sky));padding:18px 20px;background:var(--surface);border-radius:0 14px 14px 0}.learning-box h2{margin:0 0 7px;font-size:18px}.learning-box p{margin:0;color:var(--muted);line-height:1.6}.example{padding:15px;border:1px solid var(--line);background:var(--surface-2);border-radius:12px}.example b{display:block;margin-bottom:4px}.example small{color:var(--muted)}.word-chips{display:flex;gap:7px;flex-wrap:wrap}.word-chip{border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:7px 10px;font-size:13px}
.quiz{display:grid;gap:12px}.question{padding:18px;border:1px solid var(--line);background:var(--surface);border-radius:15px}.question legend{font-weight:780;line-height:1.45;padding:0 4px;color:var(--ink)}.question-number{color:var(--level-color,var(--sky));font-size:11px;text-transform:uppercase;letter-spacing:.08em;display:block;margin-bottom:7px}.options{display:grid;gap:8px;margin-top:13px}.option{display:flex;align-items:flex-start;gap:10px;padding:11px 12px;border:1px solid var(--line);border-radius:10px;cursor:pointer}.option:hover{border-color:var(--level-color,var(--sky));background:var(--soft)}.option input{margin-top:3px;accent-color:var(--level-color,var(--sky))}.feedback{margin-top:12px;padding:11px 12px;border-radius:10px;line-height:1.5;font-size:13px}.feedback.good{background:color-mix(in srgb,var(--good) 12%,var(--surface));color:var(--good)}.feedback.bad{background:color-mix(in srgb,var(--bad) 10%,var(--surface));color:var(--bad)}
.audio-button{margin:10px 0 0;border:1px solid var(--line);background:var(--surface-2);color:var(--ink);border-radius:999px;min-height:38px;padding:7px 12px;cursor:pointer}.visual-cue{font-size:28px;margin-right:7px}.result-box{padding:24px;border-radius:18px;background:var(--soft);border:1px solid var(--line);margin-top:18px}.result-box h2{margin:0 0 8px}.score-big{font-size:42px;font-weight:900;color:var(--level-color,var(--sky));letter-spacing:-.04em}
.question-audio{display:block;width:min(100%,560px);margin:12px 0 5px}.audio-note{display:block;color:var(--muted);line-height:1.45}.writing-area{min-height:210px}.writing-task{display:grid;gap:12px}.score-label{display:grid;grid-template-columns:auto auto 1fr;align-items:center;gap:8px;color:var(--muted);font-size:12px}.score-label input{width:100%;accent-color:var(--level-color,var(--sky))}.sample p{white-space:pre-wrap}.sample.weak{border-color:color-mix(in srgb,var(--bad) 35%,var(--line))}.sample.strong{border-color:color-mix(in srgb,var(--good) 35%,var(--line))}
.flash-layout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:18px}.flashcard{min-height:360px;display:grid;align-content:center;text-align:center;padding:34px;border:1px solid color-mix(in srgb,var(--level-color,var(--sky)) 35%,var(--line));border-radius:24px;background:linear-gradient(145deg,var(--surface),color-mix(in srgb,var(--level-color,var(--sky)) 7%,var(--surface)));box-shadow:var(--shadow);cursor:pointer;user-select:none}.flashcard .side-label{font-size:11px;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);font-weight:850}.flashcard h2{font-size:clamp(30px,7vw,50px);line-height:1.12;letter-spacing:-.04em;margin:18px 0;color:var(--navy)}.flashcard p{color:var(--muted);line-height:1.6}.flash-actions{display:flex;justify-content:center;gap:8px;flex-wrap:wrap;margin-top:16px}.rating-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:14px}.rating{border:1px solid var(--line);border-radius:11px;background:var(--surface);min-height:52px;padding:7px;cursor:pointer;font-size:12px}.rating b{display:block;font-size:15px}.rating.again{color:var(--bad)}.rating.good{color:var(--good)}.rating.easy{color:var(--sky)}.flash-side{display:grid;gap:12px;align-content:start}.stat-list{display:grid;gap:10px}.stat-row{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:13px}.stat-row b{color:var(--ink)}
.progress-bar{height:9px;border-radius:99px;background:var(--line);overflow:hidden}.progress-bar span{display:block;height:100%;border-radius:inherit;background:var(--level-color,var(--sky))}.readiness{display:grid;gap:12px}.readiness-row{display:grid;grid-template-columns:140px minmax(0,1fr) 44px;align-items:center;gap:10px;font-size:13px}.readiness-row b{text-align:right}
.format-table{width:100%;border-collapse:collapse;min-width:650px}.table-scroll{overflow:auto;border:1px solid var(--line);border-radius:14px}.format-table th,.format-table td{text-align:left;padding:13px 14px;border-bottom:1px solid var(--line);vertical-align:top}.format-table th{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);background:var(--surface-2)}.format-table tr:last-child td{border-bottom:0}
.timer{position:sticky;top:14px;z-index:10;display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:999px;background:var(--surface);padding:9px 13px;box-shadow:var(--shadow);font-variant-numeric:tabular-nums}.timer.urgent{color:var(--bad);border-color:var(--bad)}
.note-area{width:100%;min-height:120px;resize:vertical;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:12px;padding:12px;line-height:1.5}.mistake{display:grid;gap:11px}.mistake-answer{font-size:13px;color:var(--muted)}.mistake-answer b{color:var(--ink)}
.achievement{display:flex;gap:13px;align-items:flex-start}.achievement-icon{width:42px;height:42px;display:grid;place-items:center;border-radius:12px;background:var(--soft);font-size:20px}.achievement.locked{opacity:.55}.heatmap{display:grid;grid-template-columns:repeat(14,1fr);gap:5px}.heat-day{aspect-ratio:1;border-radius:4px;background:var(--line)}.heat-day.active{background:var(--level-color,var(--sky))}
.empty{text-align:center;padding:46px 22px;border:1px dashed var(--line);border-radius:18px;color:var(--muted);background:var(--surface)}.empty .empty-icon{font-size:34px;display:block;margin-bottom:10px}.notice{padding:14px 16px;border:1px solid color-mix(in srgb,var(--gold) 55%,var(--line));background:color-mix(in srgb,var(--gold) 10%,var(--surface));border-radius:13px;line-height:1.55;color:var(--muted)}.notice b{color:var(--ink)}
.toast{position:fixed;right:22px;bottom:22px;z-index:100;background:var(--surface);color:var(--ink);border:1px solid var(--line);padding:12px 16px;border-radius:11px;box-shadow:var(--shadow);max-width:min(360px,calc(100vw - 30px));animation:toast-in .2s ease}@keyframes toast-in{from{opacity:0;transform:translateY(8px)}}
.mobile-nav{display:none}.drawer-backdrop{display:none}.visually-hidden{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
@media(max-width:1050px){.grid.four{grid-template-columns:repeat(2,minmax(0,1fr))}.grid.three{grid-template-columns:repeat(2,minmax(0,1fr))}.flash-layout{grid-template-columns:1fr}.flash-side{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:820px){.shell{display:block}.sidebar{position:fixed;left:0;top:0;bottom:0;width:min(86vw,310px);height:100svh;transform:translateX(-105%);transition:transform .22s ease;box-shadow:var(--shadow);z-index:80}.sidebar.open{transform:none}.drawer-backdrop{display:block;position:fixed;inset:0;background:rgba(3,11,20,.55);z-index:70;border:0}.mobile-top{height:64px;display:flex;align-items:center;justify-content:space-between;padding:10px 16px;border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--surface) 92%,transparent);position:sticky;top:0;z-index:40;backdrop-filter:blur(12px)}.mobile-top .brand{padding:0}.mobile-top .brand-copy small{display:none}.main{padding:24px 16px 96px}.mobile-nav{position:fixed;left:0;right:0;bottom:0;z-index:50;display:grid;grid-template-columns:repeat(5,1fr);padding:7px max(8px,env(safe-area-inset-right)) calc(7px + env(safe-area-inset-bottom));border-top:1px solid var(--line);background:color-mix(in srgb,var(--surface) 94%,transparent);backdrop-filter:blur(14px)}.mobile-nav a{display:grid;place-items:center;gap:2px;min-height:48px;text-decoration:none;color:var(--muted);font-size:10px;font-weight:760}.mobile-nav a span{font-size:19px}.mobile-nav a[aria-current="page"]{color:var(--level-color,var(--sky))}.page-head{margin-bottom:20px}.top-actions{display:none}.filters{grid-template-columns:repeat(2,minmax(0,1fr))}.search{grid-column:span 2}}
@media(max-width:600px){.grid.two,.grid.three,.grid.four{grid-template-columns:1fr}.flash-side{grid-template-columns:1fr}.hero{padding:24px}.page-head h1,.hero h1{font-size:31px}.rating-grid{grid-template-columns:repeat(2,1fr)}.readiness-row{grid-template-columns:100px minmax(0,1fr) 38px}.lesson-row{grid-template-columns:auto minmax(0,1fr)}.lesson-meta{grid-column:2;text-align:left}.question{padding:15px}.card{padding:17px}.flashcard{min-height:320px;padding:24px}.flashcard h2{font-size:32px}}
.example b{font-size:18px}.example small{display:block}.pinyin{display:block;color:var(--gold);font-size:13px;margin:3px 0}.flashcard h2{font-family:"Microsoft YaHei","PingFang SC","Noto Sans CJK SC",ui-sans-serif,sans-serif}details{margin-top:10px;border:1px solid var(--line);border-radius:10px;padding:10px 12px;color:var(--muted)}summary{cursor:pointer;font-weight:750;color:var(--ink)}details p{white-space:pre-wrap;line-height:1.6}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}