:root{--ios-blue: hsl(197 71% 73%);--ios-blue-light: hsl(197 71% 92%);--aero-blue: hsl(197 71% 73%);--aero-blue-strong: hsl(192 70% 45%);--aero-blue-soft: hsl(194 78% 94%);--aero-bg: #f3fbff;--glass-card: rgba(255, 255, 255, .82);--glass-card-strong: rgba(255, 255, 255, .94);--pronunciation-green: #0f766e;--ios-red: #FF3B30;--ios-green: #34C759;--ios-orange: #FF9500;--ios-bg: #F3F8FC;--ios-card: #FFFFFF;--ios-separator: #C6C6C8;--ios-separator-light: #E5E5EA;--ios-primary: #000000;--ios-secondary: #3C3C43;--ios-tertiary: #8E8E93;--ios-quaternary: #AEAEB2;--ios-nav-blur: rgba(255, 255, 255, .85);--ios-corner-lg: 20px;--ios-corner-md: 16px;--ios-corner-sm: 12px;--ios-shadow: 0 10px 28px rgba(66, 119, 153, .1);--soft-border: rgba(119, 181, 213, .2);color:var(--ios-primary);font-family:-apple-system,SF Pro Display,SF Pro Text,Helvetica Neue,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}body{margin:0;min-width:320px;min-height:100vh;background:linear-gradient(180deg,#dbf4fff2,#f6fbfff5 42%,#f6f8fc)}button,input{font:inherit}button{border:0;cursor:pointer}button:active{opacity:.7}button:focus-visible,input:focus-visible{outline:2px solid var(--ios-blue);outline-offset:2px}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--ios-quaternary);border-radius:4px}.app-shell{width:min(1180px,100%);margin:0 auto;padding:0 18px max(36px,env(safe-area-inset-bottom));min-height:100vh;background:linear-gradient(180deg,#e7f8ffbd,#fafcfff5 34%,#f6f8fcfa);box-shadow:0 24px 80px #25597e1f}.page-top,.speech-bar,.reader-toolbar,.section-heading{display:flex;align-items:center;justify-content:space-between;gap:14px}.app-header{display:flex;align-items:center;justify-content:space-between;padding:max(8px,env(safe-area-inset-top)) 20px 10px;background:#f8fdffc2;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:.5px solid var(--soft-border);position:sticky;top:0;z-index:10}.app-shell:not(.route-home) .app-header{display:none}.route-home .app-header{position:relative;align-items:center;min-height:228px;padding:max(30px,calc(env(safe-area-inset-top) + 20px)) 24px 30px;overflow:hidden;background:linear-gradient(90deg,#fffffffc,#ffffffe0,#ffffff47 48%,#fff0),linear-gradient(180deg,#ffffff5c,#e5f8ff1a 48%,#b0e4f400),url(/images/hong-kong-skyline-banner.png);background-position:left center,left center,right 46%;background-repeat:no-repeat;background-size:100% 100%,100% 100%,auto 112%;border-bottom:0}.route-home .app-header:before{content:"";position:absolute;left:0;right:0;bottom:0;height:64px;pointer-events:none;background:linear-gradient(180deg,#fff0,#abe1f32e 68%,#5ebede29)}.route-home .app-header:after{content:none}.app-header>*{position:relative;z-index:1}.app-header h1{color:#10205a;font-size:34px;font-weight:800;letter-spacing:-.41px;margin:0;line-height:1.1}.app-header>div:first-child{min-width:0}.app-header>div:last-child{flex-shrink:0}.eyebrow{display:block;margin:0;color:#263769;font-size:13px;font-weight:600;letter-spacing:-.08px}h1,h2,h3,p{margin-top:0}h1{font-size:28px;font-weight:700;letter-spacing:.36px;line-height:1.15;margin-bottom:0}h2{margin-bottom:6px;font-size:20px;font-weight:650;letter-spacing:.38px}h3{font-size:17px;font-weight:600;letter-spacing:-.41px;margin-bottom:6px}.speech-chip{font-family:-apple-system,SF Pro Text,Helvetica Neue,sans-serif;display:inline-flex;align-items:center;gap:7px;min-height:34px;padding:6px 14px;border-radius:20px;background:var(--ios-card);box-shadow:var(--ios-shadow);color:var(--ios-secondary);font-size:15px;font-weight:500;white-space:nowrap}.speech-chip.playing{background:var(--ios-blue-light);color:var(--aero-blue-strong)}.speech-chip.paused{background:#fff3e0;color:var(--ios-orange)}.home-panel{display:grid;align-content:start;min-height:min(600px,calc(100vh - 160px));margin-top:0;padding:20px 20px 24px;position:relative;z-index:2}.module-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px}.module-tile{--tile-accent: var(--ios-blue);display:flex;flex-direction:column;align-items:flex-start;gap:12px;min-height:144px;padding:18px 16px 16px;background:linear-gradient(145deg,#fffffffa,#ffffffbd);color:var(--ios-primary);cursor:pointer;border:1px solid rgba(255,255,255,.88);border-radius:14px;box-shadow:0 16px 34px #46789821;text-align:left;transition:border-color .14s ease,box-shadow .14s ease,transform .14s ease;width:100%}.module-tile:nth-child(1){--tile-accent: #2f8cff}.module-tile:nth-child(2){--tile-accent: #37d681}.module-tile:nth-child(3){--tile-accent: #ffb02e}.module-tile:nth-child(4){--tile-accent: #9b78ff}.module-tile:nth-child(5){--tile-accent: #27c7d7}.module-tile:nth-child(6){--tile-accent: #ff7c55}.module-tile:nth-child(7){--tile-accent: #4aa2ff}.module-tile:nth-child(8){--tile-accent: #ff7aa8}.module-tile:nth-child(9){--tile-accent: #9a74ff}.module-tile:nth-child(10){--tile-accent: #20c8c7}.module-tile:hover{border-color:color-mix(in srgb,var(--tile-accent),white 35%);box-shadow:0 20px 42px color-mix(in srgb,var(--tile-accent),transparent 78%)}.module-tile:active{transform:translateY(1px)}.module-tile svg:first-child{width:42px;height:42px;padding:8px;border-radius:13px;color:var(--tile-accent);background:linear-gradient(145deg,color-mix(in srgb,var(--tile-accent),white 72%),#ffffffbd);box-shadow:inset 0 1px 1px #ffffffeb,0 8px 16px color-mix(in srgb,var(--tile-accent),transparent 76%)}.module-copy{display:flex;flex-direction:column;gap:7px;min-width:0;margin-top:auto}.module-copy strong{font-size:19px;font-weight:800;letter-spacing:0;line-height:1.15}.module-copy small{color:#66727c;font-size:13px;font-weight:600;letter-spacing:0;line-height:1.3}.page-top{display:flex;align-items:center;gap:12px;margin-bottom:0;padding:max(16px,env(safe-area-inset-top)) 20px 12px;background:#f7fcffd1;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:.5px solid var(--soft-border);position:sticky;top:0;z-index:10}.page-title-chip{display:inline-flex;align-items:center;justify-content:flex-start;width:fit-content;max-width:min(240px,42vw);margin-left:auto;margin-right:16px;padding:7px 15px 8px;border:1px solid rgba(255,255,255,.88);border-radius:999px;background:linear-gradient(180deg,#fffffff5,#effaffc7);box-shadow:0 10px 24px #4678981f,inset 0 1px 1px #ffffffe6;color:#264457}.page-top h2{font-size:17px;font-weight:700;letter-spacing:0;margin:0;text-align:left;line-height:1.15;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.back-button{display:inline-flex;align-items:center;gap:2px;justify-self:start;min-height:36px;padding:0 4px;background:transparent;color:var(--aero-blue-strong);font-size:17px;font-weight:500;letter-spacing:-.41px;flex-shrink:0}.back-button svg{width:20px;height:20px;stroke-width:2.5}.speech-bar{margin-bottom:0;padding:10px 20px 8px;background:#f7fcffd1;border-bottom:.5px solid var(--soft-border)}.speech-controls-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:8px}.speed-selector{display:inline-flex;padding:2px;background:#d7e5efbd;border-radius:999px;box-shadow:inset 0 1px 2px #527a961f}.speed-selector button{display:inline-flex;align-items:center;justify-content:center;min-height:28px;min-width:40px;padding:0 6px;border-radius:999px;background:transparent;color:var(--ios-secondary);font-size:12px;font-weight:500;cursor:pointer;transition:all .1s ease}.speed-selector button.selected{background:linear-gradient(180deg,#40bfd4,#20aabd);color:#fff;box-shadow:0 8px 18px #1fa9be40,inset 0 1px 1px #ffffff59}.edit-bar{display:flex;align-items:center;justify-content:flex-end;gap:8px;padding:8px 20px;background:#f7fcffd1;border-bottom:.5px solid var(--soft-border)}.edit-bar span{margin-right:auto;color:var(--ios-secondary);font-size:13px;font-weight:700}.segmented-control{display:inline-flex;padding:2px;background:#d7e5efbd;border-radius:999px;box-shadow:inset 0 1px 2px #527a961f}.segmented-control button{display:inline-flex;align-items:center;justify-content:center;gap:4px;min-height:30px;padding:0 12px;border-radius:999px;background:transparent;color:var(--ios-secondary);font-size:13px;font-weight:500;letter-spacing:-.08px;cursor:pointer;transition:all .1s ease}.segmented-control button.selected{background:linear-gradient(180deg,#40bfd4,#20aabd);color:#fff;box-shadow:0 8px 18px #1fa9be40,inset 0 1px 1px #ffffff59}.workspace{min-width:0;background:transparent;overflow:visible}.two-column{display:grid;grid-template-columns:minmax(180px,240px) minmax(0,1fr)}.lesson-list-sidebar{display:none}.lesson-drawer{display:none;padding:10px 20px;background:#f7fcffd1;position:relative}.lesson-drawer-trigger{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;min-height:44px;padding:0 16px;background:var(--glass-card-strong);border:1px solid rgba(255,255,255,.92);border-radius:12px;color:var(--ios-primary);text-align:left;cursor:pointer;box-shadow:0 8px 22px #4678981a}.lesson-drawer-trigger span{display:flex;flex-direction:column;gap:1px;min-width:0}.lesson-drawer-trigger small{color:var(--ios-tertiary);font-size:12px;font-weight:500;letter-spacing:-.08px}.lesson-drawer-trigger strong{overflow:hidden;font-size:17px;font-weight:500;letter-spacing:-.41px;line-height:1.3;text-overflow:ellipsis;white-space:nowrap}.lesson-drawer-trigger svg{flex:0 0 auto;color:var(--aero-blue-strong);transition:transform .16s ease}.lesson-drawer.open .lesson-drawer-trigger svg{transform:rotate(180deg)}.lesson-drawer-panel{margin-top:8px;padding:4px;background:transparent;border:0;border-radius:var(--ios-corner-sm);box-shadow:none;max-height:60vh;overflow:auto}.lesson-drawer-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}.lesson-drawer-item{display:grid;grid-template-columns:30px minmax(0,1fr);align-items:center;gap:8px;min-height:52px;padding:8px 12px;background:#ffffffb8;color:var(--ios-primary);text-align:left;border:.5px solid rgba(255,255,255,.88);border-radius:var(--ios-corner-sm);width:100%;cursor:pointer;transition:background .12s ease,border-color .12s ease}.lesson-drawer-item.selected{border-color:var(--aero-blue-strong);background:linear-gradient(145deg,#cdf6fde0,#e1faffc7);box-shadow:inset 0 0 0 .5px var(--aero-blue-strong)}.lesson-drawer-item:disabled{opacity:.45}.lesson-drawer-item .lesson-number{flex-shrink:0}.lesson-drawer-item strong{overflow:hidden;font-size:14px;font-weight:500;letter-spacing:-.08px;line-height:1.25;text-overflow:ellipsis;white-space:nowrap}.lesson-drawer-item em{grid-column:2;color:var(--ios-tertiary);font-size:12px;font-style:normal;font-weight:400;letter-spacing:-.08px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.lesson-list{max-height:calc(100vh - 160px);overflow:auto;padding:12px 16px;border-right:.5px solid var(--ios-separator-light)}.lesson-group+.lesson-group{margin-top:0}.lesson-group h2{padding:12px 16px 4px;margin:0;color:var(--ios-tertiary);font-size:13px;font-weight:500;letter-spacing:-.08px;text-transform:uppercase}.lesson-row{display:flex;align-items:center;gap:10px;width:100%;min-height:44px;padding:8px 12px;background:transparent;color:var(--ios-primary);text-align:left;border:none;border-radius:var(--ios-corner-sm);cursor:pointer;transition:background .1s ease}.lesson-row.selected{background:var(--ios-blue-light)}.lesson-row:disabled{cursor:not-allowed;opacity:.45}.lesson-number{display:flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:9px;background:#e7f0f7e6;color:#789;font-size:13px;font-weight:700;letter-spacing:-.08px;flex-shrink:0}.lesson-row em{color:var(--ios-tertiary);font-size:13px;font-style:normal;font-weight:400;letter-spacing:-.08px;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.lesson-count{flex-shrink:0;min-width:24px;padding:2px 8px;border-radius:999px;background:var(--ios-separator-light);color:var(--ios-tertiary);font-size:13px;font-weight:500;letter-spacing:-.08px;text-align:center}.lesson-row.selected .lesson-count{background:var(--aero-blue-strong);color:#fff}.reader{min-width:0;min-height:600px;padding:24px 28px}.reader-toolbar{margin-bottom:14px;padding:18px 18px 16px;border:1px solid rgba(255,255,255,.88);border-radius:18px;background:linear-gradient(90deg,#fffffffc,#ffffffeb 39%,#ffffff52 62%,#fff0),linear-gradient(180deg,#ffffff47,#cdf2fc0a),url(/images/hong-kong-skyline-banner.png);background-position:left center,left center,right 46%;background-repeat:no-repeat;background-size:100% 100%,100% 100%,auto 112%;box-shadow:var(--ios-shadow);align-items:flex-start;overflow:hidden;position:relative}.reader-toolbar:after{content:none;position:absolute;right:-18px;bottom:-20px;width:148px;height:78px;background:linear-gradient(180deg,#fff0,#41b2cd29),linear-gradient(90deg,transparent 0 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h3{margin:0;font-size:13px;font-weight:500;text-transform:uppercase;color:var(--ios-tertiary)}.toolbar-actions{display:flex;flex-wrap:wrap;gap:6px}.card-actions,.review-controls{display:flex;flex-wrap:wrap;gap:8px}.primary-button,.secondary-button,.danger-button,.icon-button{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:34px;border-radius:var(--ios-corner-sm);cursor:pointer;font-weight:500;font-size:15px;letter-spacing:-.41px;font-family:-apple-system,SF Pro Text,Helvetica Neue,sans-serif;transition:opacity .1s ease}.primary-button{padding:0 14px;background:linear-gradient(180deg,#43b9d3,#1f9fb8);color:#fff;font-weight:700;box-shadow:0 10px 18px #1f9fb838,inset 0 1px 1px #ffffff59}.primary-button:disabled{opacity:.4;cursor:not-allowed}.secondary-button{padding:0 14px;background:#eff8fdeb;color:var(--aero-blue-strong)}.danger-button{padding:0 14px;background:var(--ios-red);color:#fff}.icon-button{width:34px;background:#eff8fdeb;color:var(--aero-blue-strong)}.note-html{min-width:0;width:100%;max-width:100%;overflow-x:auto;color:var(--ios-primary);font-size:16px;line-height:1.7;font-family:-apple-system,SF Pro Text,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;word-break:normal}.lesson-reader{max-width:720px;margin:0 auto}.note-html h1{margin-top:1.4rem;margin-bottom:.6rem;font-size:22px;font-weight:700;letter-spacing:.36px;line-height:1.25}.note-html h1:first-child{margin-top:0}.note-html p{margin-bottom:.85rem;max-width:100%;overflow-wrap:break-word;word-break:normal}.note-html p:last-child{margin-bottom:0}.note-html table{width:100%;table-layout:fixed;border-collapse:separate;border-spacing:0;border-radius:14px;border:1px solid var(--soft-border);background:#ffffffc2}.note-html td,.note-html th{padding:12px;border:0;border-right:1px solid var(--soft-border);border-bottom:1px solid 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