:root{--font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;--bg: #f1f3f6;--bg-secondary: #e8ebf0;--bg-tertiary: #dce0e7;--text-primary: #1d1d1f;--text-secondary: #6e6e73;--text-tertiary: #aeaeb2;--accent: #007AFF;--accent-hover: #0062cc;--accent-light: rgba(0,122,255,.08);--red: #FF3B30;--red-hover: #d63029;--red-light: rgba(255,59,48,.08);--green: #34C759;--orange: #FF9500;--separator: rgba(60,60,67,.14);--shadow-sm: 0 1px 2px rgba(18,24,40,.05), 0 5px 16px rgba(18,24,40,.035);--shadow-md: 0 12px 34px rgba(18,24,40,.1), 0 2px 7px rgba(18,24,40,.05);--shadow-lg: 0 28px 80px rgba(12,18,32,.2), 0 6px 18px rgba(12,18,32,.08);--glass: rgba(248,250,253,.62);--glass-strong: rgba(249,251,254,.8);--glass-border: rgba(255,255,255,.82);--glass-highlight: inset 0 1px 0 rgba(255,255,255,.92);--glass-edge: rgba(255,255,255,.86);--glass-lowlight: rgba(80,96,128,.1);--glass-specular: linear-gradient(180deg, rgba(255,255,255,.34), rgba(255,255,255,.08) 34%, transparent 58%);--radius-sm: 12px;--radius-md: 16px;--radius-lg: 24px;--radius-full: 9999px;--ease-out: cubic-bezier(.23, 1, .32, 1);--ease-in-out: cubic-bezier(.77, 0, .175, 1);--transition-fast: .16s var(--ease-out);--transition-spring: .28s var(--ease-out);--max-width: 960px;--surface: rgba(255,255,255,.82);--surface-raised: rgba(255,255,255,.9);--surface-hover: rgba(255,255,255,.97);--surface-tint: rgba(239,244,251,.84);--surface-border: rgba(84,96,118,.12);--surface-shadow: 0 1px 2px rgba(18,24,40,.055), 0 7px 22px rgba(18,24,40,.05)}@media(prefers-color-scheme:dark){:root{--bg: #0c0d0f;--bg-secondary: #1b1c20;--bg-tertiary: #2b2c31;--surface: rgba(30,31,35,.94);--surface-raised: rgba(35,36,41,.9);--surface-hover: rgba(44,45,51,.96);--surface-tint: rgba(44,47,55,.88);--surface-border: rgba(255,255,255,.1);--surface-shadow: 0 1px 2px rgba(0,0,0,.28), 0 8px 24px rgba(0,0,0,.22);--glass: rgba(34,35,40,.66);--glass-strong: rgba(34,35,40,.82);--glass-border: rgba(255,255,255,.13);--glass-highlight: inset 0 1px 0 rgba(255,255,255,.1);--glass-edge: rgba(255,255,255,.18);--glass-lowlight: rgba(0,0,0,.34);--glass-specular: linear-gradient(180deg, rgba(255,255,255,.12), rgba(255,255,255,.03) 34%, transparent 60%);--text-primary: #f5f5f7;--text-secondary: #98989d;--text-tertiary: #636366;--separator: rgba(84,84,88,.4);--shadow-sm: 0 1px 3px rgba(0,0,0,.3);--shadow-md: 0 4px 16px rgba(0,0,0,.4);--shadow-lg: 0 12px 40px rgba(0,0,0,.5)}body{background:linear-gradient(180deg,rgba(255,255,255,.035),transparent 240px),var(--bg)}}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-family:var(--font);font-optical-sizing:auto;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-tap-highlight-color:transparent;background:var(--bg);color:var(--text-primary)}body{min-height:100vh;background:linear-gradient(180deg,rgba(255,255,255,.3),transparent 240px),var(--bg)}button,input,select,textarea{font-family:inherit;font-size:inherit;color:inherit}button,select{cursor:pointer}button{background:none;border:none}button,[role=button]{touch-action:manipulation}a{color:var(--accent);text-decoration:none}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:none;box-shadow:0 0 0 4px #007aff4d;border-radius:var(--radius-sm)}.loading-screen,.fatal-state{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;gap:20px;padding:40px 20px;color:var(--text-secondary);text-align:center}.loading-mark{display:grid;width:52px;height:52px;place-items:center;border-radius:var(--radius-md);background:var(--accent);color:#fff;font-size:15px;font-weight:700;box-shadow:0 8px 24px #007aff40}.fatal-state h1{font-size:22px;font-weight:600;color:var(--text-primary);margin-top:8px}.fatal-state p{font-size:15px;max-width:360px;margin:0}.fatal-state button{min-height:42px;padding:0 22px;border-radius:var(--radius-full);background:var(--accent);color:#fff;font-size:15px;font-weight:500;transition:background var(--transition-fast)}.fatal-state button:hover{background:var(--accent-hover)}@keyframes shimmer{0%{background-position:-400px 0}to{background-position:400px 0}}.skeleton{background:linear-gradient(90deg,var(--bg-secondary) 25%,var(--bg-tertiary) 50%,var(--bg-secondary) 75%);background-size:800px 100%;animation:shimmer 1.6s infinite;border-radius:var(--radius-sm)}.nav-bar{position:sticky;top:0;z-index:50;display:flex;align-items:center;justify-content:space-between;height:62px;padding:0 max(24px,env(safe-area-inset-left));background:var(--glass);backdrop-filter:saturate(180%) blur(18px);-webkit-backdrop-filter:saturate(180%) blur(18px);border-bottom:1px solid rgba(60,60,67,.12);box-shadow:var(--glass-highlight),inset 0 -1px 0 var(--glass-lowlight),0 8px 24px #1218280a}.nav-bar:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;z-index:0;pointer-events:none;background:var(--glass-specular)}.nav-bar>*{position:relative;z-index:1}@media(prefers-color-scheme:dark){.nav-bar{background:var(--glass);border-bottom-color:#ffffff14}}.nav-brand{display:flex;align-items:center;gap:10px}.nav-brand-strong{font-size:15px;font-weight:600;color:var(--text-primary)}.nav-brand-dot{width:8px;height:8px;border-radius:50%;background:var(--accent)}.nav-actions{display:flex;align-items:center;gap:4px}.nav-version{font-size:11px;font-weight:500;color:var(--accent);background:var(--accent-light);padding:2px 7px;border-radius:4px;letter-spacing:0;margin-left:2px}.nav-topic-dates{font-size:12px;color:var(--text-tertiary);font-weight:500;white-space:nowrap}.nav-btn{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:var(--radius-full);color:var(--text-secondary);transition:transform .12s var(--ease-out),background .16s ease,color .16s ease,box-shadow .16s ease}.nav-btn:hover{background:#ffffff9e;color:var(--accent);box-shadow:var(--glass-highlight)}.nav-btn:active{transform:scale(.94)}.nav-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.nav-btn.pro{color:var(--accent)}.announcement-nav-button{position:relative}.announcement-unread-dot{position:absolute;top:5px;right:5px;width:8px;height:8px;border:2px solid var(--bg);border-radius:50%;background:var(--red);box-sizing:content-box}.nav-breadcrumb{display:flex;align-items:center;gap:6px;font-size:14px;color:var(--text-secondary)}.nav-breadcrumb strong{color:var(--text-primary);font-weight:600}.nav-breadcrumb .sep{color:var(--text-tertiary)}.workspace-chrome{display:flex;align-items:center;justify-content:space-between;gap:18px;width:100%;max-width:var(--max-width);margin:14px auto 4px;padding:0 20px}.section-tabs{display:flex;gap:4px;width:fit-content;padding:4px;margin:0;overflow-x:auto;border:1px solid var(--glass-border);border-radius:var(--radius-full);background:var(--glass);backdrop-filter:saturate(170%) blur(18px);-webkit-backdrop-filter:saturate(170%) blur(18px);box-shadow:var(--glass-highlight),inset 0 -1px 0 var(--glass-lowlight),0 8px 24px #1218280f}.section-tab{display:flex;align-items:center;gap:8px;min-height:40px;padding:0 18px;border-radius:var(--radius-full);font-size:14px;font-weight:600;color:var(--text-secondary);background:transparent;position:relative;isolation:isolate;transition:transform .12s var(--ease-out),color .16s ease;white-space:nowrap}.section-tab:hover{background:#ffffff85;color:var(--text-primary)}.section-tab.active:hover{background:transparent}.section-tab:active{transform:scale(.97)}.section-tab.active{background:transparent;color:var(--text-primary);box-shadow:none}.section-tab-selection{position:absolute;top:0;right:0;bottom:0;left:0;z-index:-1;border-radius:inherit;border:1px solid var(--glass-edge);background:var(--surface);box-shadow:0 1px 5px #12182824,var(--glass-highlight),inset 0 -1px 0 var(--glass-lowlight)}.section-tab-content{position:relative;z-index:1;display:flex;align-items:center;gap:8px}.section-tab .count{min-width:22px;height:22px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-full);font-size:12px;font-weight:600;background:#fff3;padding:0 4px}.section-tab.active .count{background:#00000026}.main-content{max-width:var(--max-width);margin:0 auto;padding:0 20px 60px;background:transparent}.page-header{padding:32px 0 24px;text-align:center}.page-header .eyebrow{font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:0;color:var(--accent);margin-bottom:8px}.page-header h1{font-size:36px;font-weight:700;letter-spacing:0;line-height:1.12;color:var(--text-primary)}.page-header p{margin-top:8px;font-size:17px;color:var(--text-secondary);line-height:1.45}.page-header .topic-count{display:inline-flex;align-items:center;gap:6px;margin-top:14px;padding:6px 16px;border-radius:var(--radius-full);background:var(--bg-secondary);font-size:14px;font-weight:600;color:var(--text-secondary)}.landing-page{display:flex;flex-direction:column;align-items:center;padding:80px 20px;text-align:center;max-width:680px;margin:0 auto}.landing-hero{margin-bottom:48px}.landing-emoji{display:inline-flex;align-items:center;justify-content:center;width:72px;height:72px;margin-bottom:24px;border-radius:18px;font-size:36px;background:linear-gradient(135deg,var(--accent-light),rgba(0,122,255,.15));box-shadow:0 2px 12px #007aff1f}.landing-hero h1{font-size:40px;font-weight:720;letter-spacing:0;line-height:1.1;margin-bottom:12px;background:linear-gradient(135deg,var(--text-primary) 0%,var(--text-secondary) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.landing-hero p{font-size:17px;color:var(--text-secondary);max-width:400px;line-height:1.55}.landing-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;max-width:600px;width:100%;margin-bottom:40px}.landing-step{display:flex;flex-direction:column;align-items:center;gap:8px;padding:20px 12px;border-radius:var(--radius-md);background:var(--bg-secondary);border:none;transition:transform .3s cubic-bezier(.23,1,.32,1),box-shadow .3s cubic-bezier(.23,1,.32,1)}.landing-step:hover{transform:translateY(-2px);box-shadow:0 8px 24px #1218281a;transition:transform .18s var(--ease-out),box-shadow .18s var(--ease-out)}.landing-step span{font-size:32px}.landing-step strong{font-size:14px;font-weight:650;color:var(--text-primary)}.landing-step small{font-size:12px;color:var(--text-tertiary);line-height:1.4}.landing-actions{display:flex;flex-direction:column;align-items:center;gap:12px}@media(max-width:540px){.landing-page{padding:48px 16px 64px}.landing-steps{grid-template-columns:repeat(2,1fr)}.landing-hero h1{font-size:30px}}.welcome-card{border-radius:24px;padding:32px 28px;max-width:420px;text-align:center}.welcome-emoji{font-size:48px;margin-bottom:12px;line-height:1}.welcome-title{font-size:22px;font-weight:700;margin-bottom:6px;color:var(--text-primary)}.welcome-sub{font-size:14px;color:var(--text-secondary);margin-bottom:20px;line-height:1.5}.welcome-stats-row{display:flex;gap:12px;justify-content:center;margin-bottom:4px}.welcome-stat{background:var(--bg-secondary);border-radius:10px;padding:12px 16px;min-width:80px}.welcome-stat-num{font-size:22px;font-weight:700;color:var(--accent)}.welcome-stat-label{font-size:11px;color:var(--text-tertiary);margin-top:2px}.onboarding-steps{text-align:left;margin:8px 0}.onboarding-step{display:flex;align-items:flex-start;gap:12px;padding:12px 0;border-bottom:1px solid var(--separator)}.onboarding-step:last-child{border-bottom:none}.onboarding-step-emoji{width:40px;height:40px;flex-shrink:0;display:flex;align-items:center;justify-content:center;background:var(--bg-secondary);border-radius:10px;font-size:22px}.onboarding-step-text{display:flex;flex-direction:column;gap:2px}.onboarding-step-text strong{font-size:14px;color:var(--text-primary)}.onboarding-step-text span{font-size:12px;color:var(--text-tertiary);line-height:1.45}.streak-widget{position:static;z-index:1;display:flex;align-items:center;gap:7px;min-width:0;min-height:48px;padding:8px 13px;background:var(--glass);backdrop-filter:saturate(170%) blur(18px);-webkit-backdrop-filter:saturate(170%) blur(18px);border:1px solid var(--glass-border);border-radius:var(--radius-full);box-shadow:var(--glass-highlight),inset 0 -1px 0 var(--glass-lowlight),0 6px 18px #1218280b;text-align:left;cursor:default;-webkit-user-select:none;user-select:none}.streak-widget-flame{font-size:21px;line-height:1;margin:0}.streak-widget-num{font-size:20px;font-weight:760;color:var(--accent);line-height:1;font-variant-numeric:tabular-nums}.streak-widget-label{font-size:10px;color:var(--text-tertiary);margin:0 2px 0 0;white-space:nowrap}.streak-widget-divider{width:1px;height:24px;background:var(--separator);margin:0 4px}.streak-widget-sub{min-width:0;font-size:10px;color:var(--text-secondary);line-height:1.35;white-space:nowrap}@media(max-width:640px){.streak-widget{min-width:0;width:100%;margin:0;padding:9px 12px;border-radius:14px;box-shadow:var(--glass-highlight),inset 0 -1px 0 var(--glass-lowlight);text-align:left}.streak-widget-flame{margin:0;font-size:20px}.streak-widget-num{font-size:20px}.streak-widget-label{margin:0 2px 0 0;font-size:10px;white-space:nowrap}.streak-widget-divider{width:1px;height:26px;margin:0 4px}.streak-widget-sub{flex:1;min-width:0;font-size:10px;line-height:1.35}}.topic-grid{display:grid;gap:10px;padding:0 0 20px;width:100%;background:transparent}.topic-card-motion-wrapper{width:100%;min-width:0}.topic-card{display:flex;align-items:center;gap:14px;width:100%;padding:16px 20px;border-radius:var(--radius-md);background:var(--surface-raised);border:1px solid var(--surface-border);box-shadow:var(--glass-highlight),inset 0 -1px 0 var(--glass-lowlight),var(--surface-shadow);cursor:pointer;transform-origin:center;transition:transform .12s var(--ease-out),box-shadow .18s var(--ease-out),border-color .18s ease,background .18s ease,opacity .15s ease;position:relative;overflow:hidden;text-align:left}.topic-card:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;z-index:0;pointer-events:none;background:linear-gradient(180deg,rgba(255,255,255,.3),rgba(255,255,255,.06) 45%,transparent 72%)}.topic-card>*{position:relative;z-index:1}.topic-card:active{transform:scale(.988)}.topic-card .status-badge{padding:3px 10px;border-radius:var(--radius-full);font-size:11px;font-weight:600;white-space:nowrap;background:var(--bg-secondary);color:var(--text-secondary)}.topic-card .status-badge.new{background:var(--accent-light);color:var(--accent)}.topic-card .status-badge.required{background:var(--red-light);color:var(--red)}.topic-card .topic-icon{width:48px;height:48px;flex-shrink:0;display:flex;align-items:center;justify-content:center;border-radius:12px;font-size:26px;background:var(--surface-tint);box-shadow:inset 0 1px #ffffffb8,inset 0 -1px #50608014}.topic-card .topic-info{flex:1;min-width:0;text-align:left}.topic-card .topic-info h2{font-size:17px;font-weight:600;line-height:1.25}.topic-card .topic-info .meta{font-size:13px;color:var(--text-tertiary);margin-top:2px}.topic-card-accessory{display:flex;align-items:center;gap:8px;flex:0 0 auto}.topic-card-chevron{color:var(--text-tertiary);transition:transform .18s var(--ease-out),color .16s ease}@media(hover:hover)and (pointer:fine){.topic-card:hover{box-shadow:var(--glass-highlight),inset 0 -1px 0 var(--glass-lowlight),0 14px 34px #1218281a;border-color:#007aff4d;background:var(--surface-hover)}.topic-card:hover .topic-card-chevron{transform:translate(2px);color:var(--accent)}}.topic-card .topic-category{font-size:12px;color:var(--text-tertiary);font-weight:500}.topic-card .start-btn{padding:8px 18px;border-radius:var(--radius-full);background:var(--accent);color:#fff;font-size:14px;font-weight:500;opacity:0;transform:translate(-6px);transition:box-shadow .35s cubic-bezier(.23,1,.32,1),border-color .35s cubic-bezier(.23,1,.32,1),background .15s ease,color .15s ease,opacity .15s ease;white-space:nowrap}.topic-card:hover .start-btn{opacity:1;transform:translate(0)}.filter-bar{display:flex;gap:8px;padding:0 0 20px;flex-wrap:wrap;align-items:center}.filter-bar input[type=text]{flex:1;min-width:200px;height:40px;padding:0 16px;border-radius:var(--radius-full);border:1px solid var(--glass-border);background:var(--glass);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);box-shadow:var(--glass-highlight);font-size:14px;transition:border-color var(--transition-fast),background var(--transition-fast),box-shadow var(--transition-fast)}.filter-bar input[type=text]:focus{border-color:#007aff8a;background:var(--glass-strong);box-shadow:0 0 0 4px var(--accent-light),var(--glass-highlight);outline:0}.filter-bar input[type=text]::placeholder{color:var(--text-tertiary)}.filter-chips{display:flex;gap:6px;flex-wrap:wrap}.filter-chip{min-height:38px;padding:0 15px;border-radius:var(--radius-full);font-size:13px;font-weight:500;white-space:nowrap;background:#ffffff85;color:var(--text-secondary);transition:transform .12s var(--ease-out),box-shadow .16s ease,border-color .16s ease,background .16s ease,color .16s ease;border:1px solid var(--glass-border)}.filter-chip:hover{background:#fffc;color:var(--text-primary)}.filter-chip.active{background:var(--accent);border-color:#007affb3;color:#fff;box-shadow:0 5px 14px #007aff38,inset 0 1px #ffffff4d}.filter-chip:active{transform:scale(.97)}.filter-chip .count{font-size:11px;opacity:.7;margin-left:3px}.shared-content-hidden{visibility:hidden}.topic-transition-layer{position:fixed;top:0;right:0;bottom:0;left:0;z-index:180;pointer-events:none;overflow:hidden}.topic-transition-surface,.topic-transition-piece{position:absolute;left:0;top:0;transform-origin:top left;will-change:transform,width,height}.topic-transition-surface{border:1px solid var(--glass-border);border-radius:var(--radius-md);background:var(--glass-strong);backdrop-filter:saturate(170%) blur(18px);-webkit-backdrop-filter:saturate(170%) blur(18px);box-shadow:var(--glass-highlight),var(--shadow-md)}.topic-transition-piece{z-index:1;white-space:nowrap}.topic-transition-icon{display:grid;place-items:center;overflow:hidden;box-shadow:inset 0 1px #ffffffa3,0 2px 12px #007aff14}.topic-transition-title,.topic-transition-meta,.topic-transition-status{display:flex;align-items:center}.topic-transition-title{line-height:1.2}.topic-transition-meta{line-height:1.25}.topic-transition-status{justify-content:center;line-height:1}.practice-view{max-width:var(--max-width);margin:0 auto;padding:0 20px 60px}.back-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 0;font-size:15px;color:var(--accent);font-weight:500;transition:opacity var(--transition-fast)}.back-btn:hover{opacity:.7}.practice-shared-header{display:flex;align-items:center;gap:16px;min-height:90px;padding:16px 20px;margin-bottom:8px;border-radius:var(--radius-md);background:var(--glass-strong);box-shadow:var(--glass-highlight),var(--shadow-sm);border:1px solid var(--glass-border);backdrop-filter:saturate(170%) blur(18px);-webkit-backdrop-filter:saturate(170%) blur(18px)}.practice-shared-header h1{font-size:24px;font-weight:700;letter-spacing:0;line-height:1.2;color:var(--text-primary);margin:0}.practice-shared-icon{width:56px;height:56px;flex-shrink:0;display:flex;align-items:center;justify-content:center;border-radius:14px;font-size:28px;background:linear-gradient(135deg,var(--bg-secondary),var(--accent-light));box-shadow:0 2px 12px #007aff1a}.practice-shared-copy{flex:1;min-width:0}.practice-shared-details{display:flex;align-items:center;gap:8px;min-width:0;margin-top:6px}.practice-shared-meta{min-width:0;overflow:hidden;color:var(--text-tertiary);font-size:13px;line-height:1.25;white-space:nowrap;text-overflow:ellipsis}.practice-shared-details .part-badge{padding:4px 12px;border-radius:var(--radius-full);font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:0;background:var(--accent-light);color:var(--accent)}.practice-shared-details .shared-status-badge.old{background:var(--bg-secondary);color:var(--text-secondary)}.practice-shared-details .shared-status-badge.required{background:var(--red-light);color:var(--red)}.practice-header{padding:14px 0 24px}.practice-view>.practice-header,.practice-view>.practice-card,.practice-view>.answer-section{transition:opacity .18s var(--ease-out),transform .24s var(--ease-out),filter .18s var(--ease-out)}.practice-view.shared-transition-pending>.practice-header,.practice-view.shared-transition-pending>.practice-card,.practice-view.shared-transition-pending>.answer-section{opacity:0;transform:translateY(7px);filter:blur(2px)}.practice-header h1{font-size:30px;font-weight:700;letter-spacing:0}.question-nav{display:flex;align-items:center;gap:10px;margin-top:16px;min-width:0}.question-nav-title{color:var(--text-tertiary);font-size:11px;font-weight:650;white-space:nowrap}.question-jump-list{display:flex;align-items:center;gap:6px;min-width:0;overflow-x:auto;padding:3px;scrollbar-width:none}.question-jump-list::-webkit-scrollbar{display:none}.q-jump{display:grid;place-items:center;width:29px;height:29px;flex:0 0 29px;border:1px solid var(--separator);border-radius:8px;background:var(--bg-secondary);color:var(--text-secondary);font-size:12px;font-weight:650;transition:box-shadow .35s cubic-bezier(.23,1,.32,1),border-color .35s cubic-bezier(.23,1,.32,1),background .15s ease,color .15s ease,opacity .15s ease}.q-jump:hover{border-color:var(--accent);color:var(--accent)}.q-jump.complete{border-color:#34c75959;color:#20863d;background:#34c75914}.q-jump.active{border-color:var(--accent);background:var(--accent);color:#fff;box-shadow:0 4px 12px #007aff33}.question-nav .q-label{margin-left:auto;color:var(--text-tertiary);font-size:12px;font-variant-numeric:tabular-nums;white-space:nowrap}.practice-card{padding:28px;border-radius:var(--radius-lg);background:var(--bg-secondary);border:1px solid var(--separator);margin-bottom:20px}.practice-card .examiner-label{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:0;color:var(--text-tertiary);margin-bottom:12px}.practice-card h2{font-size:22px;font-weight:600;line-height:1.35;color:var(--text-primary)}.cue-points{margin-top:16px}.cue-points span{font-size:12px;font-weight:600;color:var(--text-tertiary);text-transform:uppercase}.cue-points ul{margin-top:6px;padding-left:20px}.cue-points li{font-size:15px;color:var(--text-secondary);line-height:1.6}.speak-btn{transition:transform .16s cubic-bezier(.23,1,.32,1);display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:var(--radius-full);color:var(--text-secondary);background:var(--bg-secondary);transition:box-shadow .35s cubic-bezier(.23,1,.32,1),border-color .35s cubic-bezier(.23,1,.32,1),background .15s ease,color .15s ease,opacity .15s ease;flex-shrink:0;margin-top:2px}.speak-btn:active{transform:scale(.93)}.speak-btn:hover{background:var(--accent-light);color:var(--accent)}.speak-btn:active{transform:scale(.92)}.speak-btn.active{background:var(--accent);color:#fff;box-shadow:0 5px 16px #007aff38}.time-guidance{display:flex;align-items:center;gap:6px;margin-top:18px;font-size:13px;color:var(--text-tertiary)}.answer-section{margin-bottom:20px}.answer-section .section-label{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:0;color:var(--text-tertiary);margin-bottom:14px}.recorder{margin-bottom:16px}.mic-btn{display:flex;flex-direction:column;align-items:center;gap:10px;padding:24px;border-radius:20px;background:var(--bg-secondary);border:2px dashed var(--separator);cursor:pointer;transition:transform .12s var(--ease-out),border-color .16s ease,background .16s ease,box-shadow .16s ease;width:100%}.mic-btn:hover{border-color:var(--accent);background:var(--accent-light)}.mic-btn-icon{width:52px;height:52px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 16px #007aff40}.mic-btn span{font-size:14px;font-weight:500;color:var(--text-secondary)}.rec-bar{display:flex;align-items:center;gap:14px;padding:12px 16px;border-radius:14px;background:#1c1c1e;color:#fff}.rec-wave-canvas{width:100%;height:40px;flex:1;border-radius:4px}.rec-info{display:flex;align-items:center;gap:7px;flex-shrink:0}.rec-dot{width:8px;height:8px;border-radius:50%;background:#ff453a;animation:rec-breathe 2s ease-in-out infinite}@keyframes rec-breathe{0%,to{opacity:1;transform:scale(1)}50%{opacity:.25;transform:scale(.75)}}.rec-time{font-size:15px;font-weight:600;font-variant-numeric:tabular-nums;min-width:40px}.rec-stop{width:34px;height:34px;border-radius:50%;background:#ff453a;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0}.rec-stop:hover{transform:scale(1.03)}.rec-stop:active{transform:scale(.95)}.rec-trans{display:flex;align-items:center;gap:10px;padding:12px 16px;border-radius:12px;background:var(--bg-secondary);color:var(--text-secondary);font-size:14px;font-weight:500}.rec-retry{display:grid;grid-template-columns:1fr 1fr;gap:8px;padding:8px;border:1px solid var(--separator);border-radius:12px;background:var(--bg-secondary)}.rec-retry button{min-height:42px;padding:0 14px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;gap:7px;font-size:14px;font-weight:600;transition:transform .14s var(--ease-out),background .16s ease,color .16s ease}.rec-retry button:active{transform:scale(.97)}.rec-retry-primary{background:var(--accent);color:#fff}.rec-retry-primary:hover{background:var(--accent-hover)}.rec-retry-secondary{background:var(--bg);color:var(--text-primary)}.rec-retry-secondary:hover{background:var(--fill-secondary)}.inline-error{display:flex;align-items:center;gap:6px;margin-top:8px;font-size:13px;color:var(--red)}.or-divider{display:flex;align-items:center;gap:12px;margin-bottom:14px;color:var(--text-tertiary);font-size:13px}.or-divider:before,.or-divider:after{content:"";flex:1;height:1px;background:var(--separator)}.answer-textarea{width:100%;min-height:120px;padding:16px;border-radius:var(--radius-md);border:1px solid var(--separator);background:var(--bg);font-size:15px;line-height:1.55;resize:vertical;transition:border var(--transition-fast)}.answer-textarea:focus{border-color:var(--accent)}.answer-textarea::placeholder{color:var(--text-tertiary)}.answer-metrics{display:flex;gap:16px;margin-top:10px;font-size:13px;color:var(--text-tertiary);flex-wrap:wrap}.submit-btn{width:100%;height:50px;border-radius:var(--radius-full);background:var(--accent);color:#fff;font-size:16px;font-weight:600;display:flex;align-items:center;justify-content:center;gap:8px;transition:box-shadow .35s cubic-bezier(.23,1,.32,1),border-color .35s cubic-bezier(.23,1,.32,1),background .15s ease,color .15s ease,opacity .15s ease;margin-top:16px}.submit-btn:hover{background:var(--accent-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.submit-btn:active{transform:scale(.98)}.submit-btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.daily-limit-hint{display:flex;align-items:center;gap:6px;padding:10px 16px;border-radius:var(--radius-sm);font-size:13px;font-weight:500;background:var(--bg-secondary);color:var(--text-secondary);margin-top:12px}.daily-limit-hint.low{background:#ff95001a;color:var(--orange)}.daily-limit-hint.exhausted{background:#ff3b3014;color:var(--red)}.evaluation-card{margin-bottom:24px;overflow:hidden;border:1px solid var(--separator);border-radius:var(--radius-lg);background:var(--bg);box-shadow:0 16px 44px #00000012,0 1px 3px #0000000a}.evaluation-card .eval-header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:25px 28px 20px}.evaluation-card .eval-eyebrow{margin-bottom:5px;color:var(--text-tertiary);font-size:10px;font-weight:750;text-transform:uppercase;letter-spacing:0}.evaluation-card .eval-title{font-size:22px;font-weight:720;letter-spacing:0}.eval-status{display:inline-flex;align-items:center;gap:5px;min-height:28px;padding:0 10px;border-radius:var(--radius-full);color:#20863d;background:#34c7591a;font-size:12px;font-weight:650;white-space:nowrap}.eval-summary{display:flex;align-items:center;gap:24px;min-height:152px;padding:24px 28px;border-top:1px solid var(--separator);border-bottom:1px solid var(--separator);background:var(--bg-secondary)}.eval-score-ring{display:grid;place-items:center;width:108px;height:108px;flex:0 0 108px;border-radius:50%;transform:rotate(-90deg)}.eval-score-core{display:flex;flex-direction:column;align-items:center;justify-content:center;width:88px;height:88px;border-radius:50%;background:var(--bg);transform:rotate(90deg);box-shadow:inset 0 0 0 1px var(--separator)}.eval-score-core strong{color:var(--text-primary);font-size:31px;line-height:1;font-weight:730;font-variant-numeric:tabular-nums}.eval-score-core span{margin-top:5px;color:var(--text-tertiary);font-size:10px;font-weight:700;text-transform:uppercase}.eval-summary-copy{min-width:0}.eval-summary-copy>span{color:var(--accent);font-size:11px;font-weight:700}.eval-summary-copy h2{margin-top:5px;font-size:24px;line-height:1.2;font-weight:720;letter-spacing:0}.eval-summary-copy p{max-width:360px;margin-top:7px;color:var(--text-secondary);font-size:13px;line-height:1.5}.eval-report-body{padding:8px 28px 30px;overflow-x:auto}.eval-report-body h2,.eval-report-body h3{color:var(--text-primary);font-weight:680;letter-spacing:0}.eval-report-body h2{margin:26px 0 10px;padding-top:22px;border-top:1px solid var(--separator);font-size:18px;line-height:1.35}.eval-report-body>h2:first-child{padding-top:0;border-top:0}.eval-report-body h3{margin:22px 0 9px;font-size:16px;line-height:1.4}.eval-report-body p,.eval-report-body li,.sample-content p,.sample-content li{color:var(--text-secondary);font-size:15px;line-height:1.72}.eval-report-body p{margin:0 0 11px}.eval-report-body ul,.eval-report-body ol{margin:8px 0 14px;padding-left:22px}.eval-report-body li{margin-bottom:6px;padding-left:2px}.eval-report-body strong,.sample-content strong{color:var(--text-primary);font-weight:650}.eval-report-body blockquote{margin:14px 0;padding:12px 16px;border-left:3px solid var(--accent);background:var(--accent-light);color:var(--text-secondary)}.eval-report-body table{width:100%;min-width:560px;margin:14px 0 20px;border-collapse:separate;border-spacing:0;font-size:13px}.eval-report-body th,.eval-report-body td{padding:10px 12px;border-right:1px solid var(--separator);border-bottom:1px solid var(--separator);text-align:left;vertical-align:top;line-height:1.5}.eval-report-body th{background:var(--bg-secondary);color:var(--text-primary);font-weight:650}.eval-report-body th:first-child,.eval-report-body td:first-child{border-left:1px solid var(--separator)}.eval-report-body tr:first-child th{border-top:1px solid var(--separator)}.eval-sample-section{padding:25px 28px 28px;border-top:1px solid var(--separator);background:#007aff09}.sample-header{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:17px}.sample-eyebrow{margin-bottom:5px;color:var(--accent);font-size:10px;font-weight:750;letter-spacing:0}.sample-title{font-size:18px;line-height:1.3;font-weight:680}.sample-header p{margin-top:4px;color:var(--text-tertiary);font-size:12px}.sample-content{color:var(--text-secondary)}.sample-content p{margin:0;color:var(--text-primary);font-size:15px;line-height:1.75}.eval-translation-section{padding:18px 0 0;margin-top:16px;border-top:1px solid var(--separator)}.translation-header{display:flex;align-items:center;gap:10px;margin-bottom:12px}.translation-eyebrow{color:var(--accent);font-size:10px;font-weight:750;letter-spacing:0}.translation-content{color:var(--text-secondary)}.translation-content p{margin:0;color:var(--text-primary);font-size:14px;line-height:1.8}.eval-actions{display:flex;gap:10px;padding:20px 28px 24px;border-top:1px solid var(--separator)}.eval-actions button{flex:1}@media(prefers-color-scheme:dark){.evaluation-card{box-shadow:0 16px 44px #00000061}.eval-status{color:#62d77d}}.announcement-modal-panel{max-width:620px;padding:0;overflow:hidden}.announcement-modal-header{position:relative;display:flex;align-items:center;gap:12px;padding:24px 26px 20px;border-bottom:1px solid var(--separator);background:var(--bg-secondary)}.announcement-icon{display:grid;place-items:center;width:40px;height:40px;flex:0 0 40px;border-radius:11px;background:var(--accent);color:#fff;box-shadow:0 7px 18px #007aff33}.announcement-modal-header span{color:var(--text-tertiary);font-size:10px;font-weight:750;letter-spacing:0}.announcement-modal-header h2{margin-top:2px;font-size:21px;font-weight:720}.announcement-close{position:static;margin-left:auto;flex:0 0 32px}.announcement-list{max-height:min(70vh,640px);overflow-y:auto}.announcement-entry{padding:28px 30px 32px}.announcement-entry+.announcement-entry{border-top:1px solid var(--separator)}.announcement-meta{display:flex;align-items:center;gap:9px;margin-bottom:10px}.announcement-meta time{color:var(--text-tertiary);font-size:12px}.announcement-meta span{padding:2px 7px;border-radius:var(--radius-full);background:var(--red-light);color:var(--red);font-size:10px;font-weight:700}.announcement-entry>h3{font-size:24px;line-height:1.25;font-weight:720;letter-spacing:0}.announcement-lead{margin-top:12px;color:var(--text-secondary);font-size:15px;line-height:1.7}.announcement-section{padding-top:20px;margin-top:20px;border-top:1px solid var(--separator)}.announcement-section h4{margin-bottom:8px;color:var(--text-primary);font-size:15px;font-weight:680}.announcement-section p,.announcement-section li{color:var(--text-secondary);font-size:14px;line-height:1.7}.announcement-section p+p{margin-top:8px}.announcement-section ol{padding-left:21px}.announcement-section li+li{margin-top:7px}.announcement-feedback-button{width:100%;margin-top:24px;border-radius:12px}.feedback-modal-panel{position:relative;max-width:500px;padding:29px 30px 30px}.feedback-heading{display:flex;align-items:flex-start;gap:13px;padding-right:40px;margin-bottom:24px}.feedback-icon{display:grid;place-items:center;width:42px;height:42px;flex:0 0 42px;border-radius:11px;color:#fff;background:var(--accent);box-shadow:0 7px 18px #007aff33}.feedback-heading span{color:var(--accent);font-size:10px;font-weight:750;letter-spacing:0}.feedback-heading h2{margin-top:4px;font-size:23px;line-height:1.25;font-weight:720}.feedback-heading p{margin-top:5px;color:var(--text-secondary);font-size:13px}.feedback-form{display:flex;flex-direction:column;gap:15px}.feedback-form label{display:block}.feedback-form label>span{display:block;margin:0 0 7px 2px;color:var(--text-secondary);font-size:12px;font-weight:650}.feedback-form label em{color:var(--text-tertiary);font-style:normal;font-weight:500}.feedback-form select,.feedback-form input,.feedback-form textarea{width:100%;border:1px solid var(--separator);border-radius:12px;background:var(--bg-secondary);color:var(--text-primary);font-size:14px;transition:border-color var(--transition-fast),background var(--transition-fast),box-shadow var(--transition-fast)}.feedback-form select,.feedback-form input{height:48px;padding:0 13px}.feedback-form textarea{min-height:132px;padding:13px;line-height:1.55;resize:vertical}.feedback-form select:focus,.feedback-form input:focus,.feedback-form textarea:focus{border-color:#007affb8;background:var(--bg);box-shadow:0 0 0 4px var(--accent-light);outline:0}.feedback-form textarea::placeholder,.feedback-form input::placeholder{color:var(--text-tertiary)}.feedback-form label small{display:block;margin:5px 2px 0;color:var(--text-tertiary);font-size:11px;text-align:right}.feedback-submit{width:100%;height:50px;border-radius:12px}.feedback-submit:disabled{opacity:.58;cursor:not-allowed}.feedback-success{padding:18px 8px 4px;text-align:center}.feedback-success>div{display:grid;place-items:center;width:52px;height:52px;margin:0 auto 14px;border-radius:50%;background:#34c7591f;color:var(--green)}.feedback-success h3{font-size:21px;font-weight:700}.feedback-success p{max-width:340px;margin:8px auto 20px;color:var(--text-secondary);font-size:14px;line-height:1.6}.feedback-success button{width:100%;border-radius:12px}.feedback-status-modal-panel{max-width:580px;padding:0;overflow:hidden}.feedback-status-header{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;padding:24px 26px 20px;border-bottom:1px solid var(--separator);background:var(--bg-secondary)}.feedback-status-header span{color:var(--accent);font-size:10px;font-weight:750;letter-spacing:0}.feedback-status-header h2{margin-top:4px;font-size:22px;font-weight:720}.feedback-status-header p{margin-top:5px;color:var(--text-secondary);font-size:13px}.feedback-status-list{display:grid;gap:10px;max-height:min(68vh,620px);padding:18px;overflow-y:auto;background:var(--bg-secondary)}.feedback-status-item{padding:17px 18px;border:1px solid var(--separator);border-radius:12px;background:var(--bg)}.feedback-status-meta{display:flex;align-items:center;justify-content:space-between;gap:12px}.feedback-status-meta span{color:var(--text-primary);font-size:12px;font-weight:650}.feedback-status-meta time{color:var(--text-tertiary);font-size:11px}.feedback-status-item>p{margin:10px 0 13px;color:var(--text-secondary);font-size:14px;line-height:1.55;white-space:pre-wrap}.feedback-status-badge{display:inline-flex;align-items:center;gap:6px;color:var(--text-tertiary);font-size:12px;font-weight:650}.feedback-status-badge>span{width:7px;height:7px;border-radius:50%;background:currentColor}.feedback-status-badge.queued{color:var(--accent)}.feedback-status-badge.in_progress{color:var(--orange)}.feedback-status-badge.fixed{color:var(--green)}.feedback-status-loading,.feedback-status-empty,.feedback-status-error{min-height:240px;padding:36px 24px;text-align:center}.feedback-status-loading{display:flex;align-items:center;justify-content:center;gap:9px;color:var(--text-secondary);font-size:14px}.feedback-status-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--text-tertiary)}.feedback-status-empty h3{margin-top:12px;color:var(--text-primary);font-size:17px}.feedback-status-empty p{max-width:320px;margin-top:6px;font-size:13px;line-height:1.55}.feedback-status-error{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:9px;color:var(--red);font-size:13px}.feedback-status-error button{display:inline-flex;align-items:center;gap:5px;color:var(--accent);font-weight:600}.primary-button{height:46px;padding:0 24px;border-radius:var(--radius-full);background:var(--accent);color:#fff;font-size:15px;font-weight:500;display:inline-flex;align-items:center;justify-content:center;gap:6px;box-shadow:inset 0 1px #ffffff47,0 7px 18px #007aff2e;transition:transform .12s var(--ease-out),box-shadow .16s ease,background .16s ease,opacity .16s ease}.primary-button:hover{background:var(--accent-hover)}.primary-button:active{transform:scale(.96);transition:transform .12s cubic-bezier(.23,1,.32,1)}.primary-button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.secondary-button{height:46px;padding:0 24px;border-radius:var(--radius-full);background:var(--glass-strong);color:var(--text-primary);font-size:15px;font-weight:500;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);display:inline-flex;align-items:center;justify-content:center;gap:6px;transition:transform .12s var(--ease-out),box-shadow .16s ease,background .16s ease,opacity .16s ease;border:1px solid var(--glass-border);box-shadow:var(--glass-highlight)}.secondary-button:hover{background:var(--bg-tertiary)}.secondary-button:active{transform:scale(.96);transition:transform .12s cubic-bezier(.23,1,.32,1)}.secondary-button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;display:flex;align-items:center;justify-content:center;background:#0c101847;backdrop-filter:saturate(130%) blur(18px);-webkit-backdrop-filter:saturate(130%) blur(18px);padding:20px}.modal-panel{position:relative;isolation:isolate;width:100%;max-width:420px;max-height:85vh;overflow-y:auto;overscroll-behavior:contain;padding:28px;border-radius:var(--radius-lg);border:1px solid var(--glass-border);background:var(--glass-strong);backdrop-filter:saturate(180%) blur(18px);-webkit-backdrop-filter:saturate(180%) blur(18px);box-shadow:var(--glass-highlight),inset 0 -1px 0 var(--glass-lowlight),var(--shadow-lg)}.origin-modal-panel{will-change:transform,opacity}.origin-modal-panel.is-sheet-dragging{-webkit-user-select:none;user-select:none;box-shadow:var(--glass-highlight),inset 0 -1px 0 var(--glass-lowlight),0 34px 90px #0c12203d}.sheet-drag-handle{display:none}.origin-modal-panel:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;z-index:0;pointer-events:none;border-radius:inherit;background:var(--glass-specular);box-shadow:inset 0 1px 0 var(--glass-edge),inset 0 -1px 0 var(--glass-lowlight)}.origin-modal-content{position:relative;z-index:1;min-width:0}.modal-panel.announcement-modal-panel,.modal-panel.feedback-status-modal-panel,.modal-panel.history-modal-panel{overflow:hidden}.modal-header{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:22px}.modal-title{display:flex;align-items:center;gap:12px}.modal-title h2{font-size:20px;font-weight:700}.modal-title p{font-size:14px;color:var(--text-secondary);margin-top:2px}.auth-backdrop{background:#1212147a}.auth-modal-panel{position:relative;max-width:448px;max-height:min(760px,calc(100vh - 32px));padding:28px 30px 30px;overflow-x:hidden;border:1px solid rgba(255,255,255,.62);box-shadow:0 24px 80px #00000038,0 2px 8px #00000014}.auth-close{position:absolute;top:18px;right:18px;z-index:1;display:grid;place-items:center;width:32px;height:32px;border-radius:50%;color:var(--text-secondary);background:var(--bg-secondary);transition:color var(--transition-fast),background var(--transition-fast),transform var(--transition-fast)}.auth-close:hover{color:var(--text-primary);background:var(--bg-tertiary)}.auth-close:active{transform:scale(.94)}.auth-brand{display:flex;align-items:center;gap:11px;padding-right:48px}.auth-brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:10px;background:var(--accent);color:#fff;font-size:12px;font-weight:750;box-shadow:0 7px 18px #007aff38}.auth-brand strong,.auth-brand span{display:block;letter-spacing:0}.auth-brand strong{font-size:14px;line-height:1.2}.auth-brand span{margin-top:3px;color:var(--text-tertiary);font-size:11px;font-weight:550;text-transform:uppercase}.auth-heading{margin:28px 0 22px}.auth-kicker{display:inline-flex;align-items:center;gap:6px;margin-bottom:9px;color:var(--accent);font-size:12px;font-weight:650}.auth-heading h2{font-size:27px;line-height:1.15;font-weight:720;letter-spacing:0}.auth-heading p{margin-top:7px;color:var(--text-secondary);font-size:14px;line-height:1.45}.auth-mode-switch{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));min-height:42px;padding:3px;margin-bottom:22px;border-radius:11px;background:var(--bg-secondary)}.auth-mode-switch button{min-width:0;border-radius:8px;color:var(--text-secondary);font-size:14px;font-weight:600;transition:box-shadow .35s cubic-bezier(.23,1,.32,1),border-color .35s cubic-bezier(.23,1,.32,1),background .15s ease,color .15s ease,opacity .15s ease}.auth-mode-switch button.active{color:var(--text-primary);background:var(--bg);box-shadow:0 1px 4px #0000001a,0 1px 1px #0000000a}.auth-form{display:flex;flex-direction:column;gap:15px}.auth-field>span{display:block;margin:0 0 7px 2px;color:var(--text-secondary);font-size:12px;font-weight:650}.auth-input-shell{display:grid;grid-template-columns:22px minmax(0,1fr) auto;align-items:center;min-height:52px;padding:0 13px;border:1px solid var(--separator);border-radius:12px;background:var(--bg-secondary);color:var(--text-tertiary);transition:border-color var(--transition-fast),background var(--transition-fast),box-shadow var(--transition-fast)}.auth-input-shell:focus-within{border-color:#007affb8;background:var(--bg);box-shadow:0 0 0 4px var(--accent-light);color:var(--accent)}.auth-input-shell input{width:100%;min-width:0;height:50px;padding:0 8px;border:0;outline:0;background:transparent;font-size:15px}.auth-input-shell input::placeholder{color:var(--text-tertiary)}.auth-input-shell input:disabled{opacity:.6}.auth-password-toggle{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;color:var(--text-tertiary);transition:box-shadow .35s cubic-bezier(.23,1,.32,1),border-color .35s cubic-bezier(.23,1,.32,1),background .15s ease,color .15s ease,opacity .15s ease}.auth-password-toggle:hover{color:var(--text-primary);background:var(--bg-tertiary)}.auth-requirement{display:flex;align-items:center;gap:6px;margin-top:-4px;color:var(--text-tertiary);font-size:12px}.auth-message{display:flex;align-items:flex-start;gap:9px;padding:11px 12px;border-radius:10px;font-size:13px;line-height:1.4}.auth-message svg{flex:0 0 auto;margin-top:1px}.auth-message.error{color:var(--red);background:var(--red-light)}.auth-message.success{color:#20863d;background:#34c7591a}.auth-submit{width:100%;height:50px;margin-top:3px;border-radius:12px;font-weight:650}.auth-submit:hover{transform:translateY(-1px);box-shadow:0 8px 22px #007aff38}.auth-submit:active{transform:scale(.985)}.auth-submit:disabled{opacity:.58;cursor:not-allowed;transform:none;box-shadow:none}@media(prefers-color-scheme:dark){.topic-card:before{background:linear-gradient(180deg,rgba(255,255,255,.075),rgba(255,255,255,.02) 45%,transparent 72%)}.auth-modal-panel{border-color:#ffffff1f}.auth-mode-switch button.active{box-shadow:0 1px 5px #0000009e}.auth-message.success{color:#62d77d}.filter-chip{background:#ffffff14}.section-tab.active{background:transparent;color:var(--text-primary)}.section-tab-selection{background:#ffffff29;border-color:#ffffff24}.filter-chip.active{background:var(--accent);color:#fff}}.form-group{margin-bottom:18px}.form-group label{display:block;font-size:14px;font-weight:500;margin-bottom:6px;color:var(--text-primary)}.form-input{width:100%;height:46px;padding:0 16px;border-radius:var(--radius-sm);border:1px solid var(--separator);background:var(--bg);font-size:15px;transition:border var(--transition-fast)}.form-input:focus{border-color:var(--accent)}.form-input::placeholder{color:var(--text-tertiary)}.form-error{font-size:13px;color:var(--red);padding:8px 12px;border-radius:var(--radius-sm);background:var(--red-light);margin-bottom:12px;display:flex;align-items:center;gap:6px}.form-error.success{color:var(--green);background:#34c75914}.form-footer{margin-top:16px;text-align:center;font-size:14px;color:var(--text-secondary)}.form-footer button{color:var(--accent);font-weight:500}.form-footer button:hover{text-decoration:underline}.account-section{padding:0 0 12px}.account-section .plan-card{display:flex;align-items:center;justify-content:space-between;padding:16px;border-radius:var(--radius-md);background:var(--bg-secondary);margin-bottom:16px}.account-setting{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:15px 16px;margin-top:14px;border:1px solid var(--glass-border);border-radius:var(--radius-md);background:#ffffff61;box-shadow:var(--glass-highlight)}.account-setting strong,.account-setting span{display:block}.account-setting strong{font-size:14px}.account-setting span{margin-top:3px;color:var(--text-secondary);font-size:11px}.motion-preference{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));flex:0 0 auto;padding:3px;border-radius:var(--radius-full);background:var(--bg-secondary)}.motion-preference button{min-width:48px;min-height:32px;padding:0 10px;border-radius:var(--radius-full);color:var(--text-secondary);font-size:12px;font-weight:600;transition:transform .12s var(--ease-out),background .16s ease,color .16s ease,box-shadow .16s ease}.motion-preference button:active{transform:scale(.96)}.motion-preference button.active{color:var(--text-primary);background:var(--surface);box-shadow:0 1px 4px #12182821,var(--glass-highlight)}.plan-card .plan-badge{padding:4px 12px;border-radius:var(--radius-full);font-size:12px;font-weight:700;text-transform:uppercase;background:var(--accent-light);color:var(--accent)}.plan-card .plan-badge.pro{background:linear-gradient(135deg,#007aff,#5856d6);color:#fff}.history-modal-panel{max-width:720px}.history-list{display:grid;gap:10px;max-height:68vh;overflow-y:auto;padding-right:2px}.history-item{overflow:hidden;border-radius:var(--radius-md);background:var(--bg-secondary);border:1px solid var(--separator);cursor:pointer;interpolate-size:allow-keywords}.history-item summary{display:flex;align-items:center;gap:12px;min-height:58px;padding:12px 14px;list-style:none;font-size:14px;font-weight:550}.history-item summary::-webkit-details-marker{display:none}.history-item::details-content{block-size:0;overflow:hidden;opacity:0;transition:block-size .28s var(--ease-out),opacity .16s ease}.history-item[open]::details-content{block-size:auto;opacity:1}.history-chevron{flex:0 0 auto;color:var(--text-tertiary);transition:transform .22s var(--ease-out)}.history-item[open] .history-chevron{transform:rotate(180deg)}.history-question{min-width:0}.history-part{padding:2px 8px;border-radius:var(--radius-full);font-size:11px;font-weight:700;background:var(--accent-light);color:var(--accent)}.history-date{margin-left:auto;color:var(--text-tertiary);font-size:12px;font-weight:500;white-space:nowrap}.history-detail{border-top:1px solid var(--separator);background:var(--bg);cursor:default;overflow-wrap:break-word}.history-answer{padding:18px 20px;border-bottom:1px solid var(--separator);background:var(--bg-secondary)}.history-answer span{color:var(--text-tertiary);font-size:10px;font-weight:750;letter-spacing:0}.history-answer p{margin-top:7px;color:var(--text-primary);font-size:14px;line-height:1.6}.history-feedback-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 20px 4px}.history-feedback-heading span,.history-feedback-heading strong{display:block}.history-feedback-heading span{margin-bottom:4px;color:var(--text-tertiary);font-size:10px;font-weight:750;letter-spacing:0}.history-feedback-heading strong{color:var(--text-primary);font-size:18px}.history-feedback-heading b{color:var(--accent);font-size:24px;font-variant-numeric:tabular-nums}.history-feedback-heading b small{display:block;margin-top:1px;color:var(--text-tertiary);font-size:9px;text-align:right;text-transform:uppercase}.history-report-body{padding:0 20px 22px}.history-sample{padding:20px;border-top:1px solid var(--separator);background:#007aff09}.announcement-list,.feedback-status-list,.history-list{scrollbar-width:thin;scrollbar-color:rgba(110,110,115,.42) transparent}.announcement-list::-webkit-scrollbar,.feedback-status-list::-webkit-scrollbar,.history-list::-webkit-scrollbar{width:4px}.announcement-list::-webkit-scrollbar-track,.feedback-status-list::-webkit-scrollbar-track,.history-list::-webkit-scrollbar-track{background:transparent}.announcement-list::-webkit-scrollbar-thumb,.feedback-status-list::-webkit-scrollbar-thumb,.history-list::-webkit-scrollbar-thumb{border-radius:var(--radius-full);background:#6e6e736b}.toast{position:fixed;bottom:28px;left:50%;z-index:200;display:flex;align-items:center;gap:8px;padding:12px 22px;border-radius:var(--radius-full);background:var(--text-primary);color:var(--bg);box-shadow:0 12px 40px #0000002e;font-size:14px;font-weight:500}.spin{animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}html[data-motion=reduced] *,html[data-motion=reduced] *:before,html[data-motion=reduced] *:after{animation-duration:.01ms!important;transition-duration:.01ms!important}@media(prefers-reduced-transparency:reduce){.nav-bar,.section-tabs,.streak-widget,.filter-bar input[type=text],.topic-transition-surface,.practice-shared-header,.modal-panel,.secondary-button{background:var(--surface);backdrop-filter:none;-webkit-backdrop-filter:none}}@media(prefers-contrast:more){.nav-bar,.section-tabs,.streak-widget,.topic-card,.filter-chip,.practice-shared-header,.modal-panel{border-color:currentColor}}@media(hover:none){.nav-btn:hover,.section-tab:hover{background:transparent;color:var(--text-secondary);box-shadow:none}.section-tab.active:hover{color:var(--text-primary)}.topic-card:hover{border-color:#3c3c431a;box-shadow:var(--glass-highlight),var(--shadow-sm)}.filter-chip:hover{color:var(--text-secondary);background:#ffffff85;box-shadow:none}.filter-chip.active:hover{color:#fff;background:var(--accent);box-shadow:0 5px 14px #007aff38,inset 0 1px #ffffff4d}.back-btn:hover{opacity:1}.rec-stop:hover,.submit-btn:hover,.auth-submit:hover{transform:none}.primary-button:hover{background:var(--accent)}.secondary-button:hover{background:var(--glass-strong)}.auth-close:hover{color:var(--text-secondary);background:var(--bg-secondary)}}@media(prefers-color-scheme:dark)and (hover:none){.filter-chip:hover{background:#ffffff14}.filter-chip.active:hover{background:var(--accent)}}@media(max-width:640px){.page-header h1{font-size:28px}.nav-bar{height:calc(58px + env(safe-area-inset-top));padding:env(safe-area-inset-top) max(14px,env(safe-area-inset-right)) 0 max(14px,env(safe-area-inset-left))}.nav-topic-dates,.nav-version{display:none}.workspace-chrome{flex-direction:column;gap:8px;margin:10px auto 4px;padding:0 14px}.workspace-chrome .section-tabs{width:100%;max-width:none;margin:0;padding:4px}.section-tab{flex:1;justify-content:center;min-height:38px;padding:0 12px}.main-content{padding:0 14px 40px}.topic-card{padding:14px 16px}.topic-card .start-btn{opacity:1;transform:none;font-size:13px;padding:6px 14px}.modal-backdrop{align-items:flex-end;padding:0;backdrop-filter:saturate(125%) blur(12px);-webkit-backdrop-filter:saturate(125%) blur(12px)}.modal-panel{max-width:none;max-height:min(92vh,760px);padding:30px 20px max(24px,env(safe-area-inset-bottom));border-bottom:0;border-radius:22px 22px 0 0}.sheet-drag-handle{position:absolute;top:0;left:50%;z-index:4;display:flex;align-items:center;justify-content:center;width:88px;height:28px;transform:translate(-50%);cursor:grab;touch-action:none}.sheet-drag-handle:active{cursor:grabbing}.sheet-drag-handle span{width:36px;height:5px;border-radius:var(--radius-full);background:#6e6e7352;box-shadow:inset 0 1px #ffffff61}.welcome-card{max-width:none}.auth-backdrop{align-items:flex-end;padding:0}.auth-modal-panel{max-width:none;max-height:min(92vh,760px);padding:30px 20px max(24px,env(safe-area-inset-bottom));border:0;border-radius:20px 20px 0 0}.auth-close{top:15px;right:15px}.auth-heading{margin:24px 0 19px}.auth-heading h2{font-size:25px}.announcement-backdrop{align-items:flex-end;padding:0}.announcement-modal-panel{max-width:none;max-height:92vh;border-radius:20px 20px 0 0}.announcement-modal-header{padding:19px 20px 16px}.announcement-list{max-height:calc(92vh - 77px)}.announcement-entry{padding:23px 20px max(28px,env(safe-area-inset-bottom))}.announcement-entry>h3{font-size:21px}.feedback-backdrop{align-items:flex-end;padding:0}.feedback-modal-panel{max-width:none;max-height:92vh;padding:30px 20px max(24px,env(safe-area-inset-bottom));border-radius:20px 20px 0 0}.feedback-heading h2{font-size:21px}.feedback-status-backdrop{align-items:flex-end;padding:0}.feedback-status-modal-panel{max-width:none;max-height:92vh;border-radius:20px 20px 0 0}.feedback-status-header{padding:20px}.feedback-status-list{max-height:calc(92vh - 96px);padding:12px}.evaluation-card{border-radius:16px}.evaluation-card .eval-header{padding:21px 20px 17px}.eval-summary{gap:18px;min-height:132px;padding:20px}.eval-score-ring{width:88px;height:88px;flex-basis:88px}.eval-score-core{width:72px;height:72px}.eval-score-core strong{font-size:25px}.eval-summary-copy h2{font-size:20px}.eval-report-body{padding:5px 20px 24px}.eval-report-body h2{font-size:17px}.eval-sample-section{padding:22px 20px 24px}.eval-actions{padding:18px 20px 22px}.history-modal-panel{max-height:92vh;padding:30px 14px 22px}.history-list{max-height:76vh}.history-item summary{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:start;column-gap:10px;row-gap:3px}.history-part{grid-column:1;grid-row:1 / span 2}.history-question{grid-column:2;grid-row:1}.history-date{grid-column:2;grid-row:2;width:auto;margin:0}.history-chevron{grid-column:3;grid-row:1 / span 2;align-self:center}.account-setting{align-items:stretch;flex-direction:column}.motion-preference{width:100%}}