:root{--bg:#f7f8fc;--ink:#182230;--muted:#738091;--line:#e7eaf0;--blue:#2d6cdf;--blue-soft:#eaf1ff;--green:#188a62;--orange:#db7b2d;--card:#fff;--danger:#c74d55;--success-soft:#e8f7f0;--warning-soft:#fff3e5;--danger-soft:#fff0f1;--neutral-1:#fbfcfe;--neutral-2:#f1f4f8;--neutral-3:#dfe5ee;--neutral-6:#6d798a;--blue-mid:#5d8ee8;--blue-deep:#1f55b4;--green-deep:#116b4b;--orange-deep:#b8631e;--danger-deep:#9f363e;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:20px;--radius-2xl:24px;--shadow-card:0 6px 18px rgba(40,53,77,.06);--shadow-float:0 12px 28px rgba(40,53,77,.12);--shadow-layer:0 20px 52px rgba(24,34,48,.18);--shadow:var(--shadow-card);--fs-xs:11px;--fs-sm:12px;--fs-md:13px;--fs-body:15px;--fs-lg:17px;--fs-xl:20px;--fs-2xl:24px;--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:20px;--space-6:24px}
.auth-screen{min-height:100vh;min-height:100dvh;padding:calc(76px + env(safe-area-inset-top)) 24px calc(32px + env(safe-area-inset-bottom));background:#f7f8fc;color:var(--ink);display:grid;align-content:center;gap:28px;position:relative}.auth-screen[hidden]{display:none!important}.auth-overlay{position:fixed;inset:0;z-index:40;overflow:auto}.auth-back-button{position:absolute;left:16px;top:calc(14px + env(safe-area-inset-top));display:inline-flex;align-items:center;gap:4px;min-width:76px;min-height:44px;padding:8px 10px;color:var(--ink);font-size:30px;line-height:1;border-radius:12px}.auth-back-button span{font-size:13px;color:var(--muted);line-height:1}.auth-back-button:active{background:#e9edf4}.auth-brand h1{font-size:32px;margin:12px 0 8px}.auth-brand p{color:var(--muted);line-height:1.7}.auth-form{background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px;display:grid;gap:16px;box-shadow:0 10px 30px rgba(31,43,61,.06)}.auth-form label{display:grid;gap:8px;font-size:13px;color:var(--muted)}.auth-form input,.auth-form select{width:100%;padding:13px 14px;border:1px solid var(--line);border-radius:10px;font:inherit;color:var(--ink);background:#fff}.auth-status{min-height:18px;color:#b44747;font-size:13px}.auth-register-link,.auth-close-link{font-size:12px;color:var(--blue);font-weight:700;text-align:right;min-height:36px;padding:8px}.auth-close-link{color:var(--muted);font-weight:500}
.auth-prompt[hidden]{display:none!important}.auth-prompt{position:fixed;inset:0;z-index:35;background:rgba(15,22,35,.42);display:grid;place-items:center;padding:24px}.auth-prompt-card{width:min(100%,390px);background:#fff;border-radius:18px;padding:24px;box-shadow:0 18px 50px rgba(15,22,35,.2)}.auth-prompt-card h2{margin:8px 0;font-size:23px}.auth-prompt-card p{color:var(--muted);font-size:13px;line-height:1.65;margin:0}.auth-prompt-actions{display:flex;gap:10px;margin-top:20px}.auth-prompt-cancel{display:block;width:100%;margin-top:14px;color:var(--muted);font-size:12px}
.guest-hint{position:absolute;right:60px;top:18px;color:#9aa4b2;font-size:10px;white-space:nowrap;padding:8px 4px}.guest-hint:active{color:var(--blue)}
*{box-sizing:border-box} body{margin:0;background:#edf0f5;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}button{font:inherit;color:inherit;border:0;background:none;cursor:pointer}.app-shell{width:100%;max-width:520px;min-height:100vh;margin:0 auto;background:var(--bg);position:relative;padding-bottom:84px}.topbar{display:flex;justify-content:space-between;align-items:flex-start;padding:22px 20px 12px;position:sticky;top:0;background:rgba(247,248,252,.92);backdrop-filter:blur(12px);z-index:5}.eyebrow{font-size:11px;letter-spacing:.08em;color:var(--muted);font-weight:700}.topbar h1{font-size:24px;line-height:1.25;margin:6px 0 0;letter-spacing:-.02em}.icon-button{width:40px;height:40px;border:1px solid var(--line);border-radius:14px;background:#fff;position:relative;font-size:22px;box-shadow:var(--shadow)}.icon-button i{position:absolute;right:8px;top:7px;width:7px;height:7px;background:#ef6c58;border-radius:50%}.main-content{padding:8px 16px 20px}.hero-card{background:linear-gradient(135deg,#1d4fa7,#397de3);color:#fff;border-radius:22px;padding:20px;box-shadow:0 12px 26px rgba(45,108,223,.22);position:relative;overflow:hidden}.hero-card:after{content:"";position:absolute;width:170px;height:170px;border:1px solid rgba(255,255,255,.16);border-radius:50%;right:-65px;top:-55px}.hero-card h2{font-size:20px;margin:8px 0 6px;position:relative;z-index:1}.hero-card p{font-size:13px;line-height:1.6;margin:0;color:#dfeaff;position:relative;z-index:1}.hero-meta{display:flex;gap:8px;margin-top:17px;position:relative;z-index:1}.pill{padding:6px 10px;border-radius:999px;background:rgba(255,255,255,.17);font-size:11px}.section-head{display:flex;justify-content:space-between;align-items:center;margin:25px 2px 11px}.section-head h2{font-size:17px;margin:0}.text-button{font-size:12px;color:var(--blue);font-weight:700}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.stat-card,.card{background:var(--card);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow)}.stat-card{padding:13px 10px}.stat-card strong{display:block;font-size:22px}.stat-card span{font-size:11px;color:var(--muted);display:block;margin-top:4px}.stat-card em{font-style:normal;font-size:10px;color:var(--green);display:block;margin-top:8px}.lesson-card{padding:16px;margin-bottom:10px}.lesson-top{display:flex;justify-content:space-between;gap:10px}.lesson-top strong{font-size:15px}.lesson-top span{color:var(--muted);font-size:11px;white-space:nowrap}.lesson-card p{font-size:13px;line-height:1.55;margin:10px 0;color:#566271}.tag-row{display:flex;flex-wrap:wrap;gap:7px}.tag{background:#f1f4f8;color:#657182;padding:5px 8px;border-radius:8px;font-size:11px}.tag.blue{background:var(--blue-soft);color:var(--blue)}.progress-wrap{margin-top:12px}.progress-line{height:7px;background:#edf0f4;border-radius:99px;overflow:hidden}.progress-line span{display:block;height:100%;background:#47b78b;border-radius:99px}.progress-label{display:flex;justify-content:space-between;color:var(--muted);font-size:11px;margin-top:6px}.review-card{padding:17px;border-left:4px solid var(--orange)}.review-card h3{font-size:15px;margin:0 0 7px}.review-card p{margin:0;color:#697687;font-size:12px;line-height:1.5}.review-actions{display:flex;gap:8px;margin-top:13px}.primary-button,.secondary-button{flex:1;border-radius:12px;padding:11px 12px;font-weight:700;font-size:13px}.primary-button{background:var(--blue);color:#fff}.secondary-button{background:#f0f3f7;color:#4f5d6e}.grade-card{padding:17px}.grade-row{display:flex;justify-content:space-between;align-items:flex-end}.grade-row strong{font-size:29px}.grade-row span{font-size:12px;color:var(--green)}.chart{height:118px;display:flex;align-items:flex-end;gap:12px;padding:16px 4px 0}.bar{flex:1;background:#dbe7ff;border-radius:7px 7px 2px 2px;position:relative;min-height:28px}.bar.active{background:var(--blue)}.bar em{position:absolute;top:-18px;left:50%;transform:translateX(-50%);font-style:normal;font-size:10px;color:var(--muted)}.bar small{position:absolute;bottom:-18px;left:50%;transform:translateX(-50%);font-size:10px;color:var(--muted)}.locked-card{padding:18px;position:relative;overflow:hidden}.locked-card h3{margin:0 0 7px;font-size:15px}.locked-card p{margin:0 0 14px;color:var(--muted);font-size:12px;line-height:1.5}.blur-row{display:flex;gap:8px;filter:blur(4px);opacity:.6;margin-bottom:15px}.blur-row span{height:34px;background:#d9e1ee;border-radius:8px;flex:1}.bottom-nav{position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:100%;max-width:520px;height:76px;background:rgba(255,255,255,.96);border-top:1px solid var(--line);display:flex;justify-content:space-around;align-items:center;padding-bottom:env(safe-area-inset-bottom);z-index:10}.nav-item{display:flex;flex-direction:column;align-items:center;gap:5px;color:#9aa4b2;min-width:56px}.nav-item span{font-size:20px;line-height:1}.nav-item small{font-size:10px}.nav-item.active{color:var(--blue);font-weight:700}.list-card{padding:3px 16px}.list-row{display:flex;justify-content:space-between;align-items:center;padding:16px 0;border-bottom:1px solid var(--line)}.list-row:last-child{border-bottom:0}.list-row strong{font-size:14px}.list-row p{margin:4px 0 0;color:var(--muted);font-size:11px}.arrow{color:#a2adba;font-size:18px}.membership-hero{background:#fff5e6;border:1px solid #f5d7a8;border-radius:18px;padding:20px}.membership-hero h2{margin:0 0 8px;font-size:21px}.membership-hero p{margin:0;color:#856335;font-size:13px;line-height:1.6}.sheet-backdrop{position:fixed;inset:0;background:rgba(15,22,35,.4);opacity:0;pointer-events:none;transition:.25s;z-index:20}.bottom-sheet{position:fixed;left:50%;bottom:0;transform:translate(-50%,100%);width:100%;max-width:520px;background:#fff;border-radius:24px 24px 0 0;padding:26px 20px calc(22px + env(safe-area-inset-bottom));z-index:21;transition:.28s;box-shadow:0 -10px 30px rgba(20,31,52,.15)}.sheet-backdrop.open{opacity:1;pointer-events:auto}.bottom-sheet.open{transform:translate(-50%,0)}.sheet-close{position:absolute;right:18px;top:14px;font-size:26px;color:#8792a2}.bottom-sheet h2{font-size:23px;margin:8px 30px 7px 0}.sheet-lead{color:var(--muted);font-size:13px;line-height:1.6;margin:0 0 18px}.plan-list{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:14px}.plan{border:1px solid var(--line);border-radius:13px;padding:12px 8px;text-align:left;display:flex;flex-direction:column;gap:5px}.plan.selected{border:2px solid var(--blue);padding:11px 7px;background:var(--blue-soft)}.plan strong{font-size:13px}.plan span{font-size:13px;font-weight:700}.plan em{font-size:10px;color:var(--muted);font-style:normal}.fine-print{font-size:10px;color:#9aa4b2;text-align:center;margin:12px 0 0}@media(min-width:700px){.app-shell{box-shadow:0 0 30px rgba(28,42,62,.08)}}
.capture-nav{position:relative;color:#fff!important;margin-top:-22px}.capture-nav span{width:52px;height:52px;border-radius:18px;background:var(--blue);display:grid;place-items:center;font-size:31px;line-height:1;box-shadow:0 8px 18px rgba(45,108,223,.32);border:4px solid var(--bg)}.capture-nav small{color:var(--blue);font-weight:700;margin-top:1px}
.capture-steps{display:flex;align-items:center;gap:6px;margin:4px 0 16px;color:#9aa4b2;font-size:10px}.capture-steps span{white-space:nowrap}.capture-steps span.current{color:var(--blue);font-weight:700}.capture-steps i{height:1px;background:#dce3ed;flex:1}.future-tools{display:flex;flex-wrap:wrap;align-items:center;gap:7px;margin:2px 0 15px}.future-tools span{padding:6px 8px;border-radius:8px;background:#f0f3f7;color:#8c98a7;font-size:10px}.future-tools small{width:100%;color:#a0aab6;font-size:10px}
.camera-icon{position:relative;width:25px!important;height:18px!important;border:2px solid #fff;border-radius:5px;background:transparent!important;box-shadow:none!important}.camera-icon:before{content:"";position:absolute;left:7px;top:3px;width:7px;height:7px;border:2px solid #fff;border-radius:50%}.camera-icon:after{content:"";position:absolute;left:4px;top:-5px;width:8px;height:5px;border:2px solid #fff;border-bottom:0;border-radius:3px 3px 0 0}
.assistant-fab{position:fixed;right:max(14px,calc((100vw - 520px)/2 + 14px));bottom:104px;width:52px;height:52px;border-radius:18px;background:#182f63;color:#fff;z-index:12;box-shadow:0 8px 20px rgba(24,47,99,.28);display:flex;flex-direction:column;align-items:center;justify-content:center}.assistant-fab span{font-size:24px;line-height:22px}.assistant-fab small{font-size:9px}.assistant-panel{position:fixed;right:max(12px,calc((100vw - 520px)/2 + 12px));bottom:96px;width:min(360px,calc(100vw - 24px));height:min(570px,calc(100vh - 128px));background:#fff;border:1px solid var(--line);border-radius:22px;z-index:30;box-shadow:0 16px 42px rgba(26,39,63,.2);display:flex;flex-direction:column;transform:translateY(16px) scale(.96);opacity:0;pointer-events:none;transition:.22s}.assistant-panel.open{transform:translateY(0) scale(1);opacity:1;pointer-events:auto}.assistant-head{display:flex;align-items:center;gap:10px;padding:15px;border-bottom:1px solid var(--line)}.assistant-avatar{width:34px;height:34px;border-radius:12px;background:#e7eeff;color:var(--blue);display:grid;place-items:center;font-size:20px}.assistant-head strong{display:block;font-size:14px}.assistant-head small{display:block;color:var(--muted);font-size:10px}.assistant-head button{margin-left:auto;font-size:24px;color:#8b97a7}.assistant-messages{flex:1;overflow:auto;padding:15px;background:#fbfcfe}.assistant-bubble{max-width:88%;background:#eef3ff;color:#33455f;border-radius:14px 14px 14px 4px;padding:11px 12px;font-size:13px;line-height:1.55;margin-bottom:12px}.assistant-bubble.user{margin-left:auto;background:var(--blue);color:#fff;border-radius:14px 14px 4px 14px}.assistant-suggestions{display:flex;flex-wrap:wrap;gap:7px}.assistant-suggestions button{border:1px solid #d5e0f8;color:var(--blue);background:#fff;border-radius:999px;padding:7px 10px;font-size:11px}.assistant-input{display:flex;gap:8px;padding:11px;border-top:1px solid var(--line)}.assistant-input input{flex:1;border:1px solid var(--line);border-radius:11px;padding:10px 11px;font:inherit;font-size:13px;min-width:0}.assistant-input button{width:38px;border-radius:11px;background:var(--blue);color:#fff;font-size:20px}.assistant-note{text-align:center;color:#a0aab6;font-size:9px;margin:0 0 10px}
.review-page-head{display:flex;justify-content:space-between;align-items:center;margin:4px 2px 14px}.review-intro{background:#eaf1ff;border-radius:18px;padding:18px;margin-bottom:16px}.review-intro h2{font-size:21px;margin:7px 0}.review-intro p{margin:0;color:#596b84;font-size:12px;line-height:1.6}.review-question{display:flex;gap:12px;padding:16px;margin-bottom:12px}.question-number{width:30px;height:30px;border-radius:10px;background:#eaf1ff;color:var(--blue);display:grid;place-items:center;font-weight:800;flex:none}.question-body{flex:1;min-width:0}.question-meta{display:flex;gap:6px;flex-wrap:wrap}.question-meta span{font-size:10px;background:#f1f4f8;color:#6b7888;border-radius:7px;padding:4px 7px}.question-body h3{font-size:15px;line-height:1.55;margin:11px 0 8px}.question-reason{font-size:11px;color:#8a94a2;line-height:1.5;margin:0 0 12px}.question-body label{font-size:11px;color:#637083;font-weight:700}.attempt-answer{display:block;width:100%;min-height:72px;margin-top:6px;border:1px solid var(--line);border-radius:10px;padding:10px;font:inherit;font-size:13px;resize:vertical}.result-choice{display:flex;gap:8px;margin:12px 0}.result-choice button{flex:1;border:1px solid var(--line);border-radius:10px;padding:9px 5px;font-size:11px;background:#fff;color:#697789}.result-choice button.selected{border-color:var(--blue);color:var(--blue);background:var(--blue-soft);font-weight:700}.attempt-status{font-size:11px;margin:8px 0 0}.attempt-status.success{color:var(--green)}.attempt-status.error{color:#d45d4c}.review-question.completed{border-color:#8ed4b7;background:#fbfffd}.empty-state{padding:28px 18px;text-align:center}.empty-state h3{margin:0 0 7px}.empty-state p{margin:0;color:var(--muted);font-size:12px}
.notification-panel{position:fixed;top:72px;right:max(12px,calc((100vw - 520px)/2 + 12px));width:min(360px,calc(100vw - 24px));max-height:62vh;overflow:auto;background:#fff;border:1px solid var(--line);border-radius:18px;z-index:28;box-shadow:0 14px 34px rgba(26,39,63,.18);opacity:0;transform:translateY(-8px);pointer-events:none;transition:.2s}.notification-panel.open{opacity:1;transform:translateY(0);pointer-events:auto}.notification-panel header{display:flex;justify-content:space-between;align-items:center;padding:15px;border-bottom:1px solid var(--line)}.notification-panel header strong{font-size:16px}.notification-panel header button{font-size:11px;color:var(--blue);font-weight:700}.notification-item{display:flex;gap:10px;padding:14px 15px;border-bottom:1px solid #f0f2f5}.notification-item.unread{background:#f7faff}.notification-type{width:30px;height:30px;border-radius:10px;background:#eaf1ff;color:var(--blue);display:grid;place-items:center;font-size:13px;flex:none}.notification-item strong{display:block;font-size:13px}.notification-item p{font-size:12px;line-height:1.5;color:var(--muted);margin:4px 0}.notification-item time{font-size:10px;color:#a1abb7}.notification-empty{padding:30px 15px;text-align:center;color:var(--muted);font-size:12px}
.camera-stage{height:260px;margin:0 -20px 14px;background:#182230;position:relative;overflow:hidden}.camera-guide{position:absolute;inset:72px 34px 54px;border:1px solid rgba(255,255,255,.7);border-radius:10px}.camera-guide:before,.camera-guide:after,.camera-guide span:before,.camera-guide span:after{content:"";position:absolute;width:26px;height:26px;border-color:#fff;border-style:solid}.camera-guide:before{left:-2px;top:-2px;border-width:3px 0 0 3px}.camera-guide:after{right:-2px;top:-2px;border-width:3px 3px 0 0}.camera-guide span:before{left:-2px;bottom:-2px;border-width:0 0 3px 3px}.camera-guide span:after{right:-2px;bottom:-2px;border-width:0 3px 3px 0}.camera-back{display:none}.shutter-button{position:absolute;left:50%;bottom:14px;transform:translateX(-50%);width:66px;height:66px;border:4px solid #fff;border-radius:50%;display:grid;place-items:center;z-index:2}.shutter-button span{width:52px;height:52px;background:#fff;border-radius:50%;display:block}.album-button{position:absolute;right:16px;bottom:16px;width:52px;height:52px;border-radius:16px;background:rgba(255,255,255,.92);color:#182230;display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:24px;z-index:2}.album-button small{font-size:9px;margin-top:-2px}.capture-sheet{padding-top:70px}.capture-sheet .sheet-close{z-index:4}.camera-stage+.capture-steps{margin-top:0}

/* AI assistant: spacious mobile bottom sheet with comfortable reading and touch targets. */
.assistant-fab{width:56px;height:56px;right:max(16px,calc((100vw - 520px)/2 + 16px));bottom:calc(94px + env(safe-area-inset-bottom));border-radius:20px;background:#173b72;box-shadow:0 10px 24px rgba(23,59,114,.28)}
.assistant-fab span{font-size:26px;line-height:24px}.assistant-fab small{font-size:10px;margin-top:2px}
.assistant-panel{right:max(8px,calc((100vw - 520px)/2 + 8px));bottom:calc(78px + env(safe-area-inset-bottom));width:min(430px,calc(100vw - 16px));height:min(680px,calc(100dvh - 104px));border:0;border-radius:28px;box-shadow:0 20px 55px rgba(20,35,62,.24);background:#fff;overflow:hidden}
.assistant-head{padding:18px 20px 16px;gap:12px;background:#fff;border-bottom:1px solid #edf0f5}.assistant-avatar{width:42px;height:42px;border-radius:15px;background:#e8f0ff;color:#245db7;font-size:23px}.assistant-head strong{font-size:16px;letter-spacing:0}.assistant-head small{font-size:11px;margin-top:4px}.assistant-head button{width:40px;height:40px;border-radius:12px;font-size:28px;line-height:1}.assistant-head button:active{background:#f0f3f7}
.assistant-messages{padding:20px 18px 22px;background:#f8fafd}.assistant-bubble{max-width:91%;border-radius:18px 18px 18px 6px;padding:14px 15px;font-size:14px;line-height:1.7;margin-bottom:16px;box-shadow:0 2px 8px rgba(42,63,96,.04)}.assistant-bubble.user{border-radius:18px 18px 6px 18px;background:#2d6cdf;padding:13px 15px}
.assistant-suggestions{gap:9px;margin-top:4px}.assistant-suggestions button{border:1px solid #d8e4f7;border-radius:13px;padding:10px 13px;font-size:12px;background:#fff;color:#245db7;min-height:40px;box-shadow:0 2px 5px rgba(45,108,223,.05)}.assistant-suggestions button:active{background:#eaf1ff}
.assistant-input{gap:10px;padding:13px 16px calc(13px + env(safe-area-inset-bottom));background:#fff;border-top:1px solid #edf0f5}.assistant-input input{height:46px;border:1px solid #dce3ed;border-radius:15px;padding:11px 14px;font-size:14px;background:#fbfcfe}.assistant-input input:focus{outline:2px solid #d7e5ff;border-color:#7ca5ed}.assistant-input button{width:46px;height:46px;border-radius:15px;background:#2d6cdf;font-size:21px;box-shadow:0 5px 12px rgba(45,108,223,.2)}.assistant-note{font-size:10px;margin:0;padding:0 16px 10px;background:#fff;color:#9aa5b4}
@media(max-width:380px){.assistant-panel{right:0;width:100%;height:min(680px,calc(100dvh - 82px));bottom:calc(76px + env(safe-area-inset-bottom));border-radius:26px 26px 0 0}.assistant-messages{padding-left:15px;padding-right:15px}.assistant-head{padding-left:17px;padding-right:17px}}

/* Global polish pass: shared rhythm, controls, cards, and mobile touch states. */
body{font-size:var(--fs-body);line-height:1.6;color:var(--ink)}
.topbar{padding:20px 20px 14px;border-bottom:1px solid rgba(231,234,240,.72);transition:background .2s ease,box-shadow .2s ease}.topbar.scrolled{background:rgba(247,248,252,.98);box-shadow:0 5px 18px rgba(40,53,77,.08)}
.topbar h1{font-size:var(--fs-2xl);font-weight:800;letter-spacing:0;line-height:1.35}
.eyebrow{font-size:var(--fs-xs);letter-spacing:.08em}
.icon-button{width:44px;height:44px;border-radius:var(--radius-md);box-shadow:var(--shadow-card);transition:transform .16s,background .16s}
.icon-button:active{transform:scale(.97);background:var(--neutral-2)}
.main-content{padding:12px 16px 24px}
.section-head{margin:28px 2px 12px;min-height:24px}
.section-head h2{font-size:var(--fs-lg);font-weight:800;line-height:1.35;letter-spacing:0}
.text-button{font-size:var(--fs-sm);line-height:1.4;min-height:32px;padding:7px 2px}
.text-button:active{opacity:.68}
.hero-card,.membership-hero{border-radius:var(--radius-2xl);padding:var(--space-6);box-shadow:var(--shadow-float)}
.hero-card h2{font-size:var(--fs-xl);line-height:1.4}
.hero-card p,.membership-hero p{font-size:var(--fs-md);line-height:1.7}
.stats-grid{gap:var(--space-2)}
.stat-card,.card{border-radius:var(--radius-lg);box-shadow:var(--shadow-card);transition:transform .16s,box-shadow .16s,border-color .16s}
.stat-card:hover,.card:hover{box-shadow:var(--shadow-float);border-color:#dce4f0}
.stat-card:active,.lesson-card:active,.list-card:active,.review-card:active{transform:scale(.995)}
.stat-card{padding:var(--space-4) var(--space-3)}
.stat-card strong{font-size:var(--fs-2xl);line-height:1.2}
.stat-card span,.stat-card em{font-size:var(--fs-xs);line-height:1.4}
.lesson-card{padding:var(--space-5);margin-bottom:var(--space-3)}
.lesson-top strong{font-size:var(--fs-body);line-height:1.4}
.lesson-card p{font-size:var(--fs-md);line-height:1.7;margin:var(--space-3) 0}
.list-card{padding:3px var(--space-5)}
.list-row{padding:var(--space-4) 0;border-bottom-color:rgba(231,234,240,.72);min-height:68px}
.list-row strong{font-size:var(--fs-body);line-height:1.4}
.list-row p{font-size:var(--fs-xs);line-height:1.55}
.review-card{padding:var(--space-5);border-left-width:4px}
.review-card h3,.locked-card h3{font-size:var(--fs-body);line-height:1.45}
.review-card p,.locked-card p{font-size:var(--fs-md);line-height:1.7}
.grade-card{padding:var(--space-5)}
.grade-row strong{font-size:30px;line-height:1.1}
.grade-row span{font-size:var(--fs-sm)}
.empty-state{padding:32px 20px}
.empty-state p{font-size:var(--fs-md);line-height:1.7}
.primary-button,.secondary-button{min-height:44px;border-radius:var(--radius-md);padding:11px 16px;font-size:var(--fs-md);line-height:1.3;transition:transform .16s,filter .16s,box-shadow .16s}
.primary-button{background:var(--blue);box-shadow:0 5px 12px rgba(45,108,223,.16)}
.primary-button:hover{filter:brightness(1.04);box-shadow:0 7px 16px rgba(45,108,223,.22)}
.primary-button:active,.secondary-button:active{transform:scale(.97);filter:brightness(.94)}
.secondary-button{background:var(--neutral-2);color:var(--neutral-6)}
.danger-button{background:var(--danger);color:#fff;min-height:44px;border-radius:var(--radius-md);padding:11px 16px;font-size:var(--fs-md);font-weight:700}
.ghost-button{min-height:44px;border-radius:var(--radius-md);padding:11px 16px;color:var(--blue);font-size:var(--fs-md);font-weight:700}
.text-button{color:var(--blue);background:transparent;border-radius:var(--radius-md)}
.text-button:focus-visible,.ghost-button:focus-visible{outline:2px solid var(--blue-mid);outline-offset:2px}
input,textarea,select{min-height:44px;border:1px solid var(--line);border-radius:var(--radius-md);padding:10px 12px;font-size:var(--fs-body);line-height:1.45;background:#fff;color:var(--ink);transition:border-color .16s,box-shadow .16s,background .16s}
textarea{min-height:96px;resize:vertical}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--blue-mid);box-shadow:0 0 0 4px rgba(45,108,223,.12);background:#fff}
label{font-size:var(--fs-sm);line-height:1.45;color:var(--muted)}
.tag{border-radius:var(--radius-sm);font-size:var(--fs-xs);line-height:1.3}
.bottom-nav{height:80px;box-shadow:0 -5px 18px rgba(40,53,77,.06)}
.nav-item{min-width:60px;min-height:52px;justify-content:center;gap:6px}
.nav-item small{font-size:var(--fs-xs)}
.sheet-close,.assistant-head button{min-width:44px;min-height:44px;display:grid;place-items:center;border-radius:var(--radius-md)}
.sheet-close:active,.assistant-head button:active{background:var(--neutral-2)}
.notification-panel{box-shadow:var(--shadow-layer);border-radius:var(--radius-xl)}
.bottom-sheet{box-shadow:var(--shadow-layer);border-radius:var(--radius-2xl) var(--radius-2xl) 0 0}
.hero-card{background:linear-gradient(135deg,#17458f 0%,#2d6cdf 62%,#4b8ff0 100%);isolation:isolate}.hero-card:before{content:"";position:absolute;width:180px;height:180px;border:1px solid rgba(255,255,255,.18);border-radius:50%;right:-42px;top:-78px;box-shadow:0 0 0 18px rgba(255,255,255,.04),0 0 0 38px rgba(255,255,255,.025);z-index:-1}.hero-card:after{width:110px;height:110px;right:42px;top:24px;border-color:rgba(255,255,255,.1);box-shadow:0 0 34px rgba(143,193,255,.26)}.hero-card h2{font-size:22px;font-weight:850;text-shadow:0 2px 10px rgba(13,42,91,.22)}.hero-card .pill{background:rgba(255,255,255,.2);border:1px solid rgba(255,255,255,.18)}
.stats-grid .stat-card{position:relative;overflow:hidden}.stats-grid .stat-card:before{content:"";position:absolute;right:12px;top:12px;width:28px;height:28px;border-radius:10px;background:var(--blue-soft);opacity:.9}.stats-grid .stat-card:nth-child(1):after{content:"▤"}.stats-grid .stat-card:nth-child(2):after{content:"✓"}.stats-grid .stat-card:nth-child(3):after{content:"↗"}.stats-grid .stat-card:after{position:absolute;right:18px;top:15px;color:var(--blue);font-size:15px;font-weight:800;line-height:1}.stats-grid .stat-card:nth-child(2) em{color:var(--orange)}.stats-grid .stat-card:nth-child(3) em{color:var(--green)}
.review-card{position:relative;overflow:hidden;background:linear-gradient(135deg,#fffaf3,#fff);border-left-color:var(--orange)}.review-card:after{content:"";position:absolute;right:18px;top:18px;width:58px;height:58px;border:6px solid #f8e4ce;border-top-color:var(--orange);border-right-color:var(--orange);border-radius:50%;transform:rotate(30deg)}.review-card .review-actions{position:relative;z-index:1;margin-right:64px}.review-card .primary-button{box-shadow:0 7px 14px rgba(45,108,223,.2)}
.grade-card{background:linear-gradient(180deg,#fff,#fbfdff)}.chart{gap:16px;padding:26px 10px 0;height:150px}.bar{border-radius:9px 9px 3px 3px;background:#dbe7ff;box-shadow:inset 0 1px 0 rgba(255,255,255,.8);transition:height .25s ease,background .2s}.bar.active{background:linear-gradient(180deg,#4c89ed,#2d6cdf);box-shadow:0 7px 13px rgba(45,108,223,.2)}.bar em{font-size:var(--fs-sm);font-weight:800;color:var(--ink);top:-22px}.bar small{font-size:var(--fs-xs);bottom:-22px}.grade-row>div:first-child{position:relative}.grade-row>div:first-child:after{content:"↗";display:inline-grid;place-items:center;margin-left:8px;width:22px;height:22px;border-radius:50%;background:var(--success-soft);color:var(--green);font-size:13px;font-weight:800;vertical-align:5px}.grade-row span{color:var(--green);font-weight:700}
.lesson-card{position:relative;padding-left:20px;cursor:pointer}.lesson-card:before{content:"";position:absolute;left:0;top:16px;bottom:16px;width:4px;border-radius:0 4px 4px 0;background:var(--blue)}.lesson-card:nth-of-type(odd):before{background:var(--green)}.lesson-card:after{content:"›";position:absolute;right:16px;bottom:16px;color:#a1adbc;font-size:22px}.lesson-card .text-button{padding-right:26px}.lesson-top span{padding:4px 7px;border-radius:7px;background:var(--neutral-2)}
.review-question{position:relative;padding-top:48px}.review-question:before{content:"复习题目";position:absolute;left:16px;top:16px;color:var(--blue);font-size:var(--fs-sm);font-weight:800}.review-question .question-number{position:absolute;right:16px;top:14px;width:auto;height:auto;padding:5px 9px;border-radius:var(--radius-sm);font-size:var(--fs-xs);background:var(--blue-soft)}.result-choice{gap:10px}.result-choice button{min-height:46px;font-size:var(--fs-md);font-weight:700;border-radius:var(--radius-md)}.result-choice button.selected{box-shadow:0 0 0 3px rgba(45,108,223,.12);border-width:2px}.attempt-status.success{padding:10px 12px;border-radius:var(--radius-md);background:var(--success-soft);font-weight:700}.attempt-status.error{padding:10px 12px;border-radius:var(--radius-md);background:var(--danger-soft);font-weight:700}
.plan-list{gap:10px}.plan{position:relative;min-height:108px;border-radius:var(--radius-lg);padding:14px 10px}.plan span{font-size:17px;font-weight:850}.plan em{font-size:var(--fs-xs)}.plan:nth-child(2):before{content:"推荐";position:absolute;right:7px;top:-9px;padding:3px 7px;border-radius:6px;background:var(--orange);color:#fff;font-size:10px;font-weight:800}.plan.selected{box-shadow:0 0 0 3px rgba(45,108,223,.12),0 8px 18px rgba(45,108,223,.1);transform:translateY(-2px)}.plan.selected:after{content:"✓";position:absolute;right:9px;bottom:9px;color:var(--blue);font-weight:900}.membership-hero{background:linear-gradient(135deg,#fff7eb,#fff);border-color:#f4dec0}
.auth-brand:before{content:"✦";display:grid;place-items:center;width:52px;height:52px;margin-bottom:14px;border-radius:17px;background:linear-gradient(135deg,var(--blue),#73a8ff);color:#fff;font-size:25px;box-shadow:0 10px 22px rgba(45,108,223,.2)}.auth-brand h1{font-size:30px;font-weight:850}.auth-form input:focus,.auth-form select:focus{transform:translateY(-1px)}.auth-form{gap:18px}.auth-form .primary-button{margin-top:4px}
.list-card .list-row{position:relative;padding-left:34px}.list-card .list-row:before{content:"";position:absolute;left:0;top:20px;width:24px;height:24px;border-radius:8px;background:var(--blue-soft)}.list-card .list-row:after{content:"›";position:absolute;right:0;color:#a1adbc;font-size:20px}.list-card .list-row .tag{margin-right:18px}.list-card .list-row p{padding-right:18px}
.ui-icon{width:24px;height:24px;display:block;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:none}.assistant-fab .ui-icon{width:25px;height:25px}.assistant-avatar .ui-icon{width:23px;height:23px}.sheet-close .ui-icon,.assistant-head button .ui-icon{width:22px;height:22px}.text-button .ui-icon{display:inline-block;vertical-align:-7px;margin-right:3px}.text-button{display:inline-flex;align-items:center;gap:3px}
.nav-item .ui-icon{width:24px;height:24px}.nav-item.active .ui-icon{stroke-width:2}.nav-item.active:after{content:"";width:4px;height:4px;border-radius:50%;background:var(--blue);position:absolute;bottom:1px}.nav-item{position:relative}
.page-enter{animation:page-enter 190ms ease-out both}.page-enter .card,.page-enter .stat-card,.page-enter .lesson-card,.page-enter .list-card,.page-enter .review-card{animation:card-rise 190ms ease-out both}.page-enter .card:nth-child(1),.page-enter .stat-card:nth-child(1){animation-delay:0ms}.page-enter .card:nth-child(2),.page-enter .stat-card:nth-child(2){animation-delay:30ms}.page-enter .card:nth-child(3),.page-enter .stat-card:nth-child(3){animation-delay:60ms}.page-enter .card:nth-child(4),.page-enter .stat-card:nth-child(4){animation-delay:90ms}.page-enter .card:nth-child(5){animation-delay:120ms}.page-enter .card:nth-child(6){animation-delay:150ms}
@keyframes page-enter{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes card-rise{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
.sheet-backdrop{transition:opacity 250ms cubic-bezier(.22,1,.36,1)}.bottom-sheet{transition:transform 250ms cubic-bezier(.22,1,.36,1),box-shadow 250ms ease}.bottom-sheet.open{box-shadow:var(--shadow-layer)}
.bottom-nav .nav-item:active,.assistant-fab:active,.icon-button:active,.sheet-close:active{transform:scale(.97)}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-duration:.01ms!important}.page-enter,.page-enter .card,.page-enter .stat-card,.page-enter .lesson-card,.page-enter .list-card,.page-enter .review-card{animation:none!important}}

/* Keep floating surfaces inside the mobile viewport and prevent stacked layers. */
.sheet-backdrop{z-index:60}
.bottom-sheet{z-index:61;left:0;right:0;width:min(520px,100%);margin:0 auto;padding-left:max(20px,env(safe-area-inset-left));padding-right:max(20px,env(safe-area-inset-right));padding-bottom:calc(22px + env(safe-area-inset-bottom))}
.notification-panel{z-index:70;right:max(12px,calc((100vw - 520px)/2 + 12px));width:min(360px,calc(100vw - 24px))}
.assistant-panel{z-index:71;right:max(8px,calc((100vw - 520px)/2 + 8px));width:min(430px,calc(100vw - 16px))}
.auth-prompt{z-index:80}.auth-overlay{z-index:90}
@media(max-width:520px){.app-shell,.topbar,.main-content,.bottom-nav{max-width:100vw}.bottom-sheet{border-radius:24px 24px 0 0}.notification-panel{right:12px}.assistant-panel{right:8px}}

/* Auth screens keep a reserved top action area instead of vertically centering
   long forms beneath the back control. */
.auth-screen{display:block;align-content:initial;padding-top:calc(88px + env(safe-area-inset-top));padding-bottom:calc(40px + env(safe-area-inset-bottom))}
.auth-screen .auth-brand{margin-bottom:24px}
.auth-screen .auth-form{margin:0 auto}
@media(max-width:380px){.auth-screen{padding-left:20px;padding-right:20px}.auth-screen .auth-brand,.auth-screen .auth-form{width:100%}}

/* Home workspace layout: compact feature tiles with calm color accents. */
.workspace-hero{position:relative;overflow:hidden;padding:20px;border-radius:var(--radius-2xl);color:#fff;background:linear-gradient(135deg,#183b72 0%,#2d6cdf 68%,#6f9fe9 100%);box-shadow:var(--shadow-float)}
.workspace-hero:after{content:"";position:absolute;width:170px;height:170px;right:-58px;top:-86px;border:1px solid rgba(255,255,255,.2);border-radius:50%;box-shadow:0 0 0 18px rgba(255,255,255,.05),0 0 0 38px rgba(255,255,255,.03)}
.workspace-hero-top{position:relative;z-index:1;display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.workspace-hero h2{margin:8px 0 6px;font-size:22px;line-height:1.35}.workspace-hero p{position:relative;z-index:1;margin:0;color:#deebff;font-size:13px;line-height:1.65}.hero-status{position:relative;z-index:1;display:inline-flex;align-items:center;gap:5px;white-space:nowrap;padding:6px 9px;border:1px solid rgba(255,255,255,.2);border-radius:999px;background:rgba(255,255,255,.14);font-size:10px}.hero-status i{width:6px;height:6px;border-radius:50%;background:#7de0b1}.workspace-progress{position:relative;z-index:1;margin-top:18px;padding:12px 13px;border:1px solid rgba(255,255,255,.16);border-radius:14px;background:rgba(10,31,68,.18);display:grid;grid-template-columns:auto 1fr;gap:2px 12px;align-items:end}.workspace-progress strong{font-size:26px;line-height:1}.workspace-progress>div:first-child span{display:block;font-size:10px;color:#cbdcff;margin-top:4px}.progress-track{height:8px;align-self:center;background:rgba(255,255,255,.2);border-radius:99px;overflow:hidden}.progress-track span{display:block;height:100%;border-radius:99px;background:#8bdcb5}.workspace-progress-meta{grid-column:1/-1;display:flex;justify-content:space-between;color:#cbdcff;font-size:10px}.workspace-progress-meta b{color:#fff}.home-section{margin-top:24px}.home-section-head{margin:0 2px 11px}.section-note{font-size:11px;color:var(--muted)}.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.feature-tile{min-width:0;min-height:112px;padding:12px 7px 10px;border:1px solid var(--line);border-radius:16px;background:#fff;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;text-align:center;box-shadow:var(--shadow-card);transition:transform .16s,box-shadow .16s,border-color .16s}.feature-tile:active{transform:scale(.97)}.feature-tile:hover{box-shadow:var(--shadow-float);border-color:#d5dfef}.feature-icon{width:42px;height:42px;border-radius:14px;display:grid;place-items:center}.feature-icon .ui-icon{width:23px;height:23px}.feature-tile strong{font-size:12px;line-height:1.3}.feature-tile small{min-height:15px;color:var(--muted);font-size:10px;line-height:1.3}.feature-blue .feature-icon{color:#2d6cdf;background:#eaf1ff}.feature-orange .feature-icon{color:#d47a2b;background:#fff1e3}.feature-green .feature-icon{color:#188a62;background:#e8f7f0}.feature-purple .feature-icon{color:#7661c7;background:#f1edff}.home-review-card{position:relative;display:flex;align-items:center;gap:11px;padding:15px;border-left:4px solid var(--orange);background:linear-gradient(135deg,#fffaf3,#fff)}.home-review-icon{width:38px;height:38px;flex:none;display:grid;place-items:center;border-radius:12px;background:#fff0dd;color:var(--orange)}.home-review-icon .ui-icon{width:21px;height:21px}.home-review-copy{min-width:0;flex:1}.home-review-copy h3{margin:6px 0 3px;font-size:14px}.home-review-copy p{margin:0;color:var(--muted);font-size:11px;line-height:1.5}.orange-tag{background:#fff0dd;color:#bd6920}.home-review-button{flex:none;width:72px;min-height:40px;padding:8px 5px;font-size:11px}.home-member-strip{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:24px 0 6px;padding:14px 15px;border:1px solid #dce8fa;border-radius:16px;background:#f3f7ff}.home-member-strip strong{font-size:13px}.home-member-strip p{margin:3px 0 0;color:var(--muted);font-size:10px}.home-member-strip .ghost-button,.home-member-strip .primary-button{flex:none;min-height:38px;padding:8px 11px;font-size:11px}.hero-pills{position:relative;z-index:1;display:flex;gap:7px;margin-top:17px}.hero-pills span{padding:6px 9px;border-radius:999px;background:rgba(255,255,255,.15);font-size:10px}
@media(max-width:380px){.feature-grid{gap:6px}.feature-tile{min-height:108px;padding-left:4px;padding-right:4px}.feature-tile strong{font-size:11px}.feature-tile small{font-size:9px}.home-review-card{align-items:flex-start}.home-review-button{margin-top:1px}}
.add-child-button{width:100%;margin:4px 0 8px}.add-child-card{padding:18px;margin-top:12px}.add-child-card h3{margin:7px 0 14px;font-size:17px}.child-form{display:grid;gap:12px}.child-form label{display:grid;gap:6px}.inline-status{min-height:18px;margin:0;font-size:12px}.inline-status.success{color:var(--green)}.inline-status.error{color:var(--danger)}
.skeleton-stack{display:grid;gap:12px;padding-top:4px}.skeleton-block{position:relative;overflow:hidden;background:linear-gradient(105deg,#eef1f5 25%,#f8fafc 42%,#eef1f5 62%);background-size:240% 100%;animation:shimmer 1.25s ease-in-out infinite;border-radius:var(--radius-lg)}.skeleton-hero{height:168px;border-radius:var(--radius-2xl)}.skeleton-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.skeleton-stat{height:92px}.skeleton-card{height:108px}.empty-state{display:grid;justify-items:center;gap:4px;min-height:176px}.empty-state .empty-icon{width:48px;height:48px;border-radius:50%;display:grid;place-items:center;background:var(--blue-soft);color:var(--blue);margin-bottom:6px}.empty-state .state-icon{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round}.empty-state h3{font-size:var(--fs-body);margin:0}.empty-state p{max-width:270px;text-align:center;margin:0}.empty-action{margin-top:10px;min-width:132px}.error-state{display:grid;justify-items:center;text-align:center;padding:30px 20px;min-height:190px}.error-state .error-icon{width:44px;height:44px;border-radius:50%;display:grid;place-items:center;background:var(--danger-soft);color:var(--danger);font-weight:800;font-size:20px}.error-state h3{margin:2px 0 0;font-size:var(--fs-body)}.error-state p{max-width:270px;color:var(--muted);font-size:var(--fs-md);line-height:1.65;margin:0}.error-state .secondary-button{margin-top:8px;min-width:100px}.notification-loading{display:grid;gap:10px;padding:15px}.notification-loading span{height:56px;border-radius:var(--radius-md)}@keyframes shimmer{0%{background-position:100% 0}100%{background-position:-100% 0}}.button-loading{opacity:.72;pointer-events:none}.button-loading::after{content:"";display:inline-block;width:12px;height:12px;margin-left:8px;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;vertical-align:-2px;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}