:root{font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;color:#272b32;background:#f7f4ee;font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button{cursor:pointer}button:disabled{opacity:.45;cursor:default}.layout{display:flex;min-height:100vh}.sidebar{width:260px;position:sticky;top:0;height:100vh;padding:30px 18px;background:#fff;border-right:1px solid #eee8e1;display:flex;flex-direction:column;gap:12px}.brand{display:flex;gap:12px;align-items:center;padding:10px 12px 32px;font-weight:800;font-size:19px}.seal{background:#b63e36;color:white;border-radius:13px;padding:10px;font-size:26px}.nav{border:0;background:transparent;text-align:left;padding:15px 17px;border-radius:13px;color:#555b63}.nav.active{background:#f9e8e4;color:#a92f28;font-weight:750}.spacer{flex:1}.content{max-width:1120px;width:100%;padding:44px 42px 90px;margin:auto}.topline{color:#a44d43;font-size:12px;font-weight:800;letter-spacing:.15em;text-transform:uppercase}h1{font-size:clamp(30px,4vw,48px);margin:10px 0 10px;letter-spacing:-.045em}h2{font-size:25px;margin:0 0 18px;letter-spacing:-.03em}h3{margin:0 0 10px}p{line-height:1.6;color:#697079}.lead{font-size:17px;max-width:680px}.hero{background:linear-gradient(110deg,#b83e36,#8e2c28);color:#fff;padding:32px;border-radius:22px;margin:28px 0;display:flex;justify-content:space-between;gap:20px;align-items:center}.hero p{color:#ffe7e2}.hero h2{margin-bottom:5px}.btn{border:0;border-radius:12px;padding:13px 19px;background:#b63e36;color:white;font-weight:750}.btn.secondary{background:#fff;color:#a7352e}.btn.ghost{background:#f5e9e5;color:#a7352e}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}.card{background:white;border:1px solid #eee8e1;border-radius:18px;padding:23px;box-shadow:0 5px 18px #33220e05}.card.clickable{cursor:pointer}.card.clickable:hover{border-color:#cfaca3}.card .emoji{font-size:28px}.muted{font-size:13px;color:#8b8d90}.badge{display:inline-block;background:#fff0db;color:#8b5d18;padding:6px 10px;border-radius:20px;font-size:12px;font-weight:700}.row{display:flex;align-items:center;justify-content:space-between;gap:14px}.stats{display:flex;gap:12px;flex-wrap:wrap}.stat{background:white;padding:16px 22px;border-radius:14px;border:1px solid #eee8e1}.stat b{display:block;font-size:25px}.toolbar{display:flex;gap:9px;flex-wrap:wrap;margin:20px 0}.pill{border:1px solid #e5d9d2;background:white;border-radius:30px;padding:10px 15px}.pill.selected{background:#b63e36;color:white;border-color:#b63e36}.exercise{max-width:690px;margin:24px auto}.question{font-size:25px;font-weight:800;margin:16px 0}.hanzi{font-size:clamp(54px,10vw,95px);font-weight:500;text-align:center;margin:22px 0 0}.pinyin{text-align:center;font-size:20px;color:#9b5b51}.options{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:22px 0}.option{padding:18px;border:2px solid #ece7e0;border-radius:13px;background:#fff;text-align:left}.option.chosen{border-color:#b63e36;background:#fff1ef}.feedback{padding:16px;border-radius:12px;background:#e7f5e9;color:#215e38;margin:16px 0}.feedback.bad{background:#fff0e7;color:#8b3c20}.input{width:100%;padding:15px;border:2px solid #e8e0d8;border-radius:12px;background:white}.progress{height:8px;border-radius:8px;background:#eadfda;overflow:hidden}.progress>div{height:100%;background:#b63e36}.lessonlist{display:grid;gap:12px}.lesson{display:flex;justify-content:space-between;gap:12px;align-items:center;background:#fff;padding:18px;border-radius:14px;border:1px solid #ece4de}.small{font-size:13px}.notice{border-left:4px solid #b63e36;padding:12px 16px;background:#fff5ee;border-radius:6px;margin:20px 0;color:#6b4b3e}.bottomnav{display:none}.word{font-size:30px;color:#2d3035}.toggle{padding:8px 12px;border:1px solid #e8d8d1;border-radius:9px;background:white}.dark{background:#17191e;color:#f4f1eb}.dark .sidebar,.dark .card,.dark .stat,.dark .lesson,.dark .option,.dark .input,.dark .pill,.dark .toggle{background:#23262d;color:#f2f0eb;border-color:#393b40}.dark .nav{color:#ddd}.dark .nav.active{background:#4a2b2c;color:#ffb2a9}.dark p{color:#b9bdc4}.dark .notice{background:#302b2b;color:#e4c5b9}.dark .option.chosen{background:#4a2b2c}@media(max-width:850px){.sidebar{display:none}.bottomnav{position:fixed;display:flex;bottom:0;left:0;right:0;background:#fff;border-top:1px solid #eee;z-index:5;justify-content:space-around;padding:8px 0 max(8px,env(safe-area-inset-bottom))}.bottomnav button{border:0;background:transparent;color:#666;padding:8px 3px;font-size:11px;display:grid;gap:3px;justify-items:center}.bottomnav button span{font-size:21px}.bottomnav button.active{color:#b63e36;font-weight:800}.content{padding:30px 20px 115px}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero{align-items:flex-start;flex-direction:column}.dark .bottomnav{background:#23262d;border-color:#393b40}}@media(max-width:500px){.grid,.options{grid-template-columns:1fr}.content{padding:25px 16px 110px}.hero{padding:25px}.card{padding:18px}h1{font-size:34px}}

/* v0.2 handwriting trainer */
.writing-card{max-width:750px;margin:20px auto}.writing-surface{width:min(100%,430px);aspect-ratio:1;margin:18px auto;position:relative;border:2px solid #e2d7d0;border-radius:14px;overflow:hidden;background:#fffdf8;touch-action:none}.writing-surface canvas{position:absolute;inset:0;width:100%;height:100%;z-index:3;touch-action:none}.writing-guide{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-family:"Noto Sans CJK SC","PingFang SC","Microsoft YaHei",sans-serif;font-size:clamp(140px,40vw,295px);color:#777;pointer-events:none;z-index:2;line-height:1}.writing-grid{position:absolute;inset:0;pointer-events:none;z-index:1;background:linear-gradient(to right,transparent calc(50% - .5px),#e8dcd3 50%,transparent calc(50% + .5px)),linear-gradient(to bottom,transparent calc(50% - .5px),#e8dcd3 50%,transparent calc(50% + .5px));border:1px dashed #eadfd6}.study-character{font-family:"PingFang SC","Microsoft YaHei",sans-serif;text-align:center;font-size:clamp(150px,38vw,260px);padding:15px}.dark .writing-surface{background:#26282c;border-color:#4d4643}.dark .writing-guide{color:#d2c6bd}.dark .writing-grid{opacity:.25}#guideOpacity{vertical-align:middle;max-width:130px}@media(max-width:850px){.bottomnav{overflow-x:auto}.bottomnav button{min-width:54px;flex:1}}

/* Alpha 2: handwriting selector */
.writing-choices{display:grid;grid-template-columns:repeat(auto-fill,minmax(98px,1fr));gap:10px;margin:16px 0 22px}.writing-choice{display:flex;flex-direction:column;align-items:center;gap:3px;border:2px solid #e9ddd6;background:#fff;border-radius:14px;padding:12px 5px;color:#32343a;min-height:100px}.writing-choice.active{border-color:#b63e36;background:#fff1ed}.writing-glyph{font-family:"PingFang SC","Microsoft YaHei",sans-serif;font-size:37px}.writing-choice small{font-size:11px;color:#74777b}.dark .writing-choice{background:#23262d;color:#eee;border-color:#4d4643}.dark .writing-choice.active{border-color:#e59a8b;background:#422e2e}#writingLesson{margin-top:10px}

/* Alpha 4: word-based handwriting */
.writing-word-header{text-align:center;padding:16px 8px;border-radius:16px;background:rgba(128,128,128,.07);margin:12px 0 16px;line-height:1.65}.writing-full-word{font-size:clamp(42px,9vw,74px);line-height:1.3;font-weight:600}.writing-word-header strong{font-size:19px}.writing-multi{display:flex;gap:12px;overflow-x:auto;padding:10px 0 18px;scroll-snap-type:x proximity}.writing-mini{flex:0 0 clamp(126px,36vw,180px);scroll-snap-align:start;text-align:center}.writing-mini.current{outline:2px solid #b48d57;border-radius:14px;padding:4px}.writing-surface.mini{width:100%;height:auto;aspect-ratio:1/1;margin:6px 0}.writing-surface.mini canvas{width:100%;height:100%;touch-action:none;position:relative;z-index:3}.writing-surface.mini .writing-guide{font-size:clamp(72px,18vw,118px)}

/* Alpha 5: mobile-safe writing controls and practice selection */
.writing-word-header{position:relative;padding:18px 58px 18px 12px}.writing-favorite{position:absolute;right:12px;top:12px;display:grid;place-items:center;width:44px;height:44px;border:1px solid #decfc5;background:#fff;border-radius:13px;color:#b63e36;font-size:28px;line-height:1;z-index:1}.writing-card>.row{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:12px;align-items:stretch;margin:18px 0}.writing-card>.row .btn{width:100%;min-width:0;white-space:normal;overflow-wrap:anywhere;padding:14px 8px}.writing-card .toolbar .toggle{white-space:normal}.practice-select{margin:20px 0}.practice-select .input{margin-top:12px}.dark .writing-favorite{background:#23262d;color:#ffb2a9;border-color:#54413c}@media(max-width:500px){.writing-card{padding:14px}.writing-word-header{padding-right:56px}.writing-card .toolbar{gap:8px}.writing-card .toolbar .toggle{font-size:14px;padding:10px}.writing-card>.row .btn{font-size:14px}}

/* v0.4 beta 1 dashboard */
body{background:#faf8f5}.sidebar{background:#fffdfa}
.v4-date{color:#8c898a;font-size:14px;text-transform:capitalize;margin-bottom:18px}
.v4-heading{display:flex;justify-content:space-between;align-items:center;gap:15px}
.v4-heading h1{font-size:clamp(30px,4vw,44px);line-height:1.15}
.v4-hanzi{color:#ad534a}.v4-stamp{border:2px solid #b15b52;border-radius:14px;color:#b15b52;padding:12px 18px;font-size:34px}
.v4-hero{margin:24px 0;display:flex;align-items:center;justify-content:space-between;gap:20px;background:linear-gradient(115deg,#b4574d,#964039);border-radius:24px;color:#fff;padding:30px 36px;overflow:hidden}
.v4-hero h2{font-size:clamp(25px,4vw,34px);margin:10px 0}.v4-hero p{color:#ffebe5;max-width:480px;margin:0 0 22px}
.v4-eyebrow{font-size:12px;letter-spacing:.15em;font-weight:800;color:#ffe2db}
.v4-hero-symbol{font-size:140px;line-height:1;opacity:.16;transform:rotate(-12deg)}
.v4-lightbtn{background:#fff;color:#943b36}
.v4-metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:20px 0 32px}
.v4-metric{background:#fff;border:1px solid #eee7e1;border-radius:18px;padding:19px;min-width:0}
.v4-metric span{display:block;font-size:12px;color:#858187;margin-bottom:10px}.v4-metric strong{font-size:29px}
.v4-sectiontitle{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin:26px 0 14px}.v4-sectiontitle h2{margin:0}
.v4-tasks{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.v4-task{border:1px solid #eee7e1;border-radius:18px;background:#fff;display:flex;align-items:center;gap:14px;text-align:left;padding:20px;min-width:0;color:inherit}
.v4-task-icon{background:#faf1ed;border-radius:13px;font-size:25px;width:52px;height:52px;display:grid;place-items:center;flex-shrink:0}
.v4-task-text{display:grid;gap:5px;min-width:0}.v4-task-text b{font-size:16px}.v4-task-text small{font-size:12px;line-height:1.5;color:#878087}
.v4-arrow{margin-left:auto;color:#b1534b;font-size:23px}.v4-note{margin:22px 0 10px;border:1px solid #eadfd7;background:#f6eee8;border-radius:18px;padding:22px}.v4-note p{margin:8px 0 14px}
.dark .v4-task,.dark .v4-metric{background:#24262c;color:#f1eeea;border-color:#3b3c40}.dark .v4-note{background:#302b2b;border-color:#55433e}.dark .v4-task-icon{background:#41302f}
@media(max-width:700px){.v4-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.v4-tasks{grid-template-columns:1fr}.v4-hero{padding:24px}.v4-hero-symbol{font-size:75px}.v4-stamp{display:none}}
@media(max-width:390px){.v4-hero-symbol{display:none}.v4-metric{padding:15px}.v4-task{padding:16px}}

/* v0.4 beta 2: daily checklist */
.v4-daily-progress{height:10px;background:#f0e5df;border-radius:99px;overflow:hidden;margin:0 0 12px}.v4-daily-progress>div{height:100%;background:#ac564b;border-radius:99px;transition:width .2s}.v4-hint{font-size:13px;line-height:1.5}.v4-task{padding:0;overflow:hidden;display:flex}.v4-task-open{display:flex;align-items:center;gap:14px;text-align:left;flex:1;min-width:0;border:0;background:transparent;color:inherit;padding:20px;cursor:pointer}.v4-check{margin:0 16px 0 0;border:2px solid #c7aca5;background:#fff;color:#a64f46;border-radius:50%;width:40px;height:40px;flex-shrink:0;font-size:24px;display:grid;place-items:center;cursor:pointer}.v4-task-done{border-color:#bd8b80;background:#fffaf8}.v4-task-done .v4-check{background:#a64f46;color:#fff;border-color:#a64f46}.dark .v4-check{background:#2a2a30;color:#e9b9ad}.dark .v4-task-done{background:#322b2b}@media(max-width:390px){.v4-task-open{padding:14px;gap:10px}.v4-check{margin-right:10px;width:36px;height:36px}}

/* beta 3: handwriting first, picker after */
.writing-picker-heading{margin:32px 0 12px}
.writing-picker-heading h2{margin-bottom:6px}
.writing-picker-heading p{margin:0}
.writing-card{scroll-margin-top:16px}
#writingChoices{padding-bottom:18px}

/* v0.4 Beta 4: compact mobile-first dictionary and practice */
.dict-tools{display:grid;grid-template-columns:minmax(0,2fr) minmax(130px,1fr);gap:10px;margin:16px 0 8px}.dict-count{margin:8px 0 14px;font-size:13px}.dict-list{background:var(--card,#fff);border:1px solid #ebe6e0;border-radius:18px;overflow:hidden}.dict-row{display:flex;align-items:center;border-bottom:1px solid #f0ece8;min-height:69px;background:#fff}.dict-row:last-child{border-bottom:0}.dict-main{flex:1;min-width:0;display:flex;align-items:center;gap:14px;text-align:left;padding:10px 12px;border:0;background:transparent;color:#302e35}.dict-hanzi{font-size:28px;min-width:54px;max-width:105px;line-height:1.3;overflow-wrap:anywhere}.dict-copy{display:grid;gap:3px;min-width:0}.dict-copy b{font-size:14px;color:#a44f46}.dict-copy small{font-size:13px;line-height:1.35;white-space:normal;color:#5d5860}.dict-chevron{color:#bbb;margin-left:auto;font-size:24px}.dict-icon{border:0;background:transparent;color:#9c4c46;font-size:20px;min-width:39px;min-height:45px;cursor:pointer}.dict-icon.is-fav{color:#b95b44}.dict-overlay{position:fixed;inset:0;background:#15131b88;z-index:100;display:grid;place-items:end center;padding:15px}.dict-detail{position:relative;width:min(100%,500px);border-radius:24px;background:#fff;color:#302e35;text-align:center;padding:32px 20px 28px;box-shadow:0 20px 60px #0003}.dict-close{position:absolute;right:18px;top:14px;border:0;background:transparent;font-size:22px}.dict-detail-hanzi{font-size:76px;line-height:1.5}.practice-compact{display:grid;gap:9px;max-width:600px;margin:18px 0 22px}.practice-compact label{font-weight:700}.practice-tiles{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.practice-tile{display:flex;align-items:center;gap:13px;padding:18px;background:#fff;border:1px solid #eee7e1;border-radius:16px;text-align:left;color:#302e35}.practice-tile-emoji{font-size:25px}.practice-tile span:nth-child(2){display:grid;gap:4px}.practice-tile small{color:#817b80;font-size:12px}.practice-tile .v4-arrow{margin-left:auto}.writing-quick-nav{display:flex;align-items:center;justify-content:space-between;gap:6px;margin-bottom:10px}.writing-quick-nav .toggle{padding:9px 11px;font-size:13px}.exercise.card{max-width:700px;margin:15px auto;padding:20px}.exercise .hanzi{margin:12px auto}.exercise .options{gap:10px}.dark .dict-row,.dark .dict-list,.dark .practice-tile{background:#24262c;color:#f0eae6;border-color:#454047}.dark .dict-main,.dark .practice-tile{color:#f0eae6}.dark .dict-copy small{color:#c2b8b9}
@media(max-width:700px){.dict-tools{grid-template-columns:1fr}.practice-tiles{grid-template-columns:1fr}.dict-row{min-height:62px}.dict-hanzi{font-size:25px;min-width:48px}.dict-main{gap:9px}.dict-icon{min-width:36px}.exercise.card{padding:16px}.writing-quick-nav .toggle{font-size:12px;padding:8px}}

/* v0.4 Beta 5 — handwriting controls and memory test */
.writing-card .writing-word-header{margin-top:8px;margin-bottom:10px;padding-top:10px;padding-bottom:10px}.writing-card .writing-full-word{font-size:clamp(40px,8vw,60px)}
.writing-layout-controls{display:grid!important;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px!important;margin:8px 0!important}.writing-mode-controls{display:flex!important;gap:7px!important;flex-wrap:wrap;margin:8px 0!important}
.writing-layout-controls .pill,.writing-mode-controls .pill{font-size:13px!important;padding:9px 11px!important;border-radius:13px!important;min-height:40px;white-space:normal;text-align:center;flex:1}
.writing-card .pill.selected{background:#f8e8e4!important;color:#9e4239!important;border-color:#c58c82!important;box-shadow:none!important}.writing-speak{display:block;margin:6px auto 4px!important;padding:7px 12px!important;font-size:13px!important}
.writing-bottom-nav{display:flex;justify-content:space-between;align-items:center;gap:8px;margin:15px 0 5px}.writing-bottom-nav .toggle{font-size:13px;padding:10px 8px;min-width:0}
.memory-exercise{max-width:650px;margin:14px auto;padding:16px}.memory-prompt{text-align:center;font-size:clamp(26px,7vw,39px);font-weight:700;margin:12px 0}.memory-switch{display:flex;justify-content:center;gap:8px}.memory-switch .pill{font-size:13px;padding:8px 12px}.memory-instruction{text-align:center;font-size:13px;margin:10px 0 0}.memory-surface{width:min(100%,350px);margin:12px auto;aspect-ratio:1}.memory-tools{display:flex;justify-content:center;gap:10px;margin:8px 0 12px}.memory-tools .toggle{font-size:13px;padding:9px 12px}.memory-answer{text-align:center;background:#f8f3ef;border-radius:15px;padding:10px;margin:12px 0}.memory-hanzi{font-size:48px;font-weight:600;line-height:1.3}.memory-grade{display:grid;grid-template-columns:1fr 1fr;gap:10px}.memory-grade .btn,.memory-reveal{width:100%;min-width:0}.dark .memory-answer{background:#383137}.dark .writing-card .pill.selected{background:#51352f!important;color:#f3b1a7!important}
@media(max-width:500px){.writing-card{padding:12px}.writing-mode-controls .pill{padding:8px 6px!important;font-size:12px!important}.writing-word-header{line-height:1.4}.writing-card .writing-surface:not(.mini){margin-top:9px}.memory-exercise{padding:12px}}

/* v0.5 alpha 1: book library, review, contained handwriting selection */
.writing-multi{padding:12px 5px 18px;gap:12px;scroll-padding-inline:5px}
.writing-mini{box-sizing:border-box;border:2px solid transparent;border-radius:16px;padding:5px;min-width:0}
.writing-mini.current{outline:none!important;border-color:#b48d57!important;border-radius:16px;padding:5px!important;background:rgba(180,141,87,.045)}
.writing-mini .writing-surface.mini{box-sizing:border-box;max-width:100%}
.book-list{display:grid;gap:16px;margin:20px 0}.book-card{width:100%;display:flex;align-items:center;gap:20px;text-align:left;background:#fff;border:1px solid #e9dfd8;border-radius:20px;padding:20px;color:#292b31;cursor:pointer}.book-cover{flex:0 0 104px;height:142px;display:flex;align-items:center;justify-content:center;gap:2px;background:#b54b40;color:white;border-radius:9px 15px 15px 9px;box-shadow:inset 7px 0 #ffffff22,3px 4px 12px #0002;font-size:45px;font-weight:700}.book-cover span{font-size:27px}.book-info{display:grid;gap:10px}.book-info b{font-size:20px;line-height:1.3}.book-info span,.book-info small{color:#74747b;line-height:1.45}.book-info strong{color:#ae493d;font-size:14px}.book-back{margin:12px 0}.review-banner{display:flex;justify-content:space-between;align-items:center;gap:12px;border:1px solid #e8dcd5;border-radius:16px;background:#fff;padding:16px;margin:16px 0}.review-banner p{margin:7px 0 0}.review-banner .btn{flex-shrink:0}.review-banner .btn:disabled{opacity:.45}.dark .book-card,.dark .review-banner{background:#24262c;border-color:#4d4643;color:#f0eae6}.dark .book-info span,.dark .book-info small{color:#bcb5b8}
@media(max-width:500px){.book-card{gap:14px;padding:13px}.book-cover{flex-basis:82px;height:115px;font-size:35px}.book-info b{font-size:16px}.book-info{gap:6px}.review-banner{align-items:flex-start;flex-direction:column}.writing-multi{padding-left:5px;padding-right:5px}}

/* v0.5 Alpha 2: practice stability and mobile spacing */
.practice-pinyin-setting{display:grid;gap:12px;margin:18px 0;padding:16px;border:1px solid #e9dfd8;border-radius:16px;background:#fff}
.practice-pinyin-setting label{display:flex;align-items:center;gap:9px;line-height:1.4;font-size:14px}
.practice-pinyin-setting input{accent-color:#b63e36;width:18px;height:18px;flex-shrink:0}
.exercise .input#answer{display:block;margin:22px 0 18px;min-height:54px}
.exercise>.row{margin-top:12px;gap:14px;align-items:stretch;flex-wrap:wrap}
.exercise>.row .btn{flex:1;min-width:0;padding:14px 12px}
.exercise .options{margin:24px 0 20px}
.dark .practice-pinyin-setting{background:#23262d;border-color:#393b40}
@media(max-width:500px){.exercise .input#answer{margin-bottom:22px}.exercise>.row{gap:12px}.exercise>.row .btn{font-size:15px}}