html,body,#root{height:100%;margin:0;padding:0;overflow:hidden}.app-container{display:flex;height:100vh;width:100vw}.layout-desktop{flex-direction:row;max-width:1140px;margin:0 auto;background:var(--bg-app)}.layout-desktop .sidebar{width:260px;flex-shrink:0;display:flex;flex-direction:column;justify-content:space-between}.layout-desktop .main-content{flex:1;margin:0;border-radius:0;overflow-y:auto;position:relative}@media(max-width:850px){.layout-mobile{flex-direction:column;height:100vh}.layout-mobile .main-content{flex:1;width:100%;overflow-y:auto;background:var(--bg-engine)}}:root{--royal-purple: #663399;--royal-purple-deep: #2D1F38;--royal-purple-light: #cb96ff;--fox-orange: #FF7A1E;--fox-orange-glow: #FF9F5E;--verdant-green: #43A047;--crimson-red: #D32F2F;--bg-desk-gray: #cfd8dc;--bg-app-deep: #1a0b2e;--bg-app-surface: #261440;--bg-purple: #4a306d;--bg-surface: #f8f9fa;--border-subtle: #eee;--act-reading: #ff8fa3;--act-listening: #ff5252;--act-grammar: #4ea8de;--act-skill: #ffb703;--bg-deep: #3c2150;--accent-purple: #8e008b;--bg-desktop: linear-gradient(180deg, var(--royal-purple) 0%, #1A1025 100%);--bg-app: #cfd8dc;--bg-card: #FFFFFF;--bg-engine: #f9f6ff;--bg-voyage: linear-gradient(180deg, #3B1E5C 0%, #1A1025 100%);--bg-brand-primary: var(--royal-purple);--bg-brand-secondary: var(--fox-orange);--glass-bg: rgba(255, 255, 255, .1);--glass-border: rgba(255, 255, 255, .15);--glass-text: var(--text-inverse);--bg-intro-card: #f8fafc;--text-main: #2D1F38;--text-muted: #757575;--text-on-brand: #FFFFFF;--text-inverse: #FFFFFF;--text-accent: var(--fox-orange);--chip-bg: #FFFFFF;--border-subtle: #E0E0E0;--border-3d: #D0D0D0;--radius-btn: 28px;--radius-card: 24px;--gutter: 24px;--dash-bg: #2e005d;--dash-surface: #5c008b;--dash-accent-purple: #8e008b;--dash-orange: #ff8300;--dash-orange-deep: #ff6200;--dash-text: #ffffff}@media(prefers-color-scheme:dark){:root{--bg-app: #0A0510;--bg-engine: #1A1A1A;--bg-card: #1A1A1A;--dash-bg: #6c37a1;--glass-bg: rgba(255, 255, 255, .05);--glass-border: rgba(255, 255, 255, .1);--glass-text: var(--text-main);--bg-intro-card: #f8fafc;--text-main: #F5F5F5;--text-muted: #A0A0A0;--text-inverse: #000000;--text-on-brand: #FFFFFF;--chip-bg: #1E1E1E;--border-subtle: #333333;--border-3d: #000000;--royal-purple: #9D71FD}}*,*:before,*:after{box-sizing:border-box}*{box-sizing:border-box}html,body{max-width:100%;overflow-x:hidden}body{font-family:Nunito,sans-serif;background:#e6e6fa;-webkit-font-smoothing:antialiased}.app-container{display:flex;flex-direction:column;height:100vh;width:100vw;overflow:hidden}.layout-body{display:flex;flex-direction:row;flex-grow:1;overflow:hidden;height:calc(100vh - 64px)}.global-header{width:100%;height:64px;background:var(--bg-purple);border-bottom:1px solid #e5e7eb;display:flex;align-items:center;justify-content:space-between;padding:0 1.5rem;flex-shrink:0;z-index:100}.top-header{height:64px;display:flex;align-items:center;justify-content:space-between;padding:0 2rem;background:#fff;border-bottom:1px solid #e5e7eb;position:sticky;top:0;z-index:10}.header-actions{display:flex;align-items:center;gap:1.25rem}.header-left .page-title{font-size:1.25rem;font-weight:700;color:#111827}.header-left .mobile-logo{font-size:1.1rem;font-weight:800;color:#4f46e5}.header-right{display:flex;align-items:center;gap:1rem}.sidebar{width:240px;background:var(--bg-engine);border-right:1px solid rgba(255,255,255,.05);display:flex;flex-direction:column;justify-content:space-between;padding:2rem 1rem;flex-shrink:0;height:100vh;position:sticky;top:0}.logo{font-size:1.2rem;font-weight:900;text-transform:uppercase;letter-spacing:2px;color:var(--text-muted);margin-bottom:30px;padding-left:12px}.logo-text{color:#ff7a1e;font-weight:800;font-size:1.4rem;letter-spacing:-.5px}.sidebar-top{display:flex;flex-direction:column;gap:8px}.sidebar-bottom{display:flex;flex-direction:column;gap:4px;border-top:1px solid rgba(255,255,255,.05);padding-top:20px}.main-content{position:relative;flex-grow:1;overflow-y:auto;background:#fff}.nav-item{display:flex;align-items:center;gap:12px;padding:12px 16px;border-radius:14px;border:none;background:transparent;color:var(--text-main);font-weight:600;font-size:.95rem;cursor:pointer;transition:all .2s ease;text-align:left;position:relative}.nav-item:hover{background:#b885fcf2;color:var(--bg-purple);transform:translate(4px)}.nav-item.active{background:#ff7a1e1a;color:#ff7a1e}.nav-item.active:before{content:"";position:absolute;left:0;top:12px;bottom:12px;width:4px;background:#ff7a1e;border-radius:0 4px 4px 0}.nav-item.active svg{color:#ff7a1e}.nav-item-sub{display:flex;align-items:center;gap:10px;padding:10px 16px;border-radius:12px;border:none;background:transparent;color:#fff6;font-size:.85rem;font-weight:500;cursor:pointer;transition:all .2s ease}.nav-item-sub:hover{color:#fff;background:#ffffff0d}.nav-item-sub svg{opacity:.7}.bottom-nav{height:60px;background:var(--bg-purple);border-top:1px solid #ddd;display:flex;justify-content:space-around;align-items:center}.footerButton{background:var(--bg-purple);border:0px solid var(--border-subtle);border-bottom:0px solid var(--border-3d);border-radius:18px;font-weight:800;cursor:pointer;transition:all .1s;color:var(--text-on-brand)}.btn-3d{background-color:var(--chip-bg);border:2px solid var(--border-subtle);border-bottom:4px solid var(--border-3d);border-radius:var(--radius-btn);font-weight:800;cursor:pointer;transition:all .1s}body:has(.lesson-engine-active) .sidebar,body:has(.lesson-engine-active) .bottom-nav{display:none}.lang-pill{display:flex;align-items:center;gap:.5rem;padding:.4rem .8rem;background:var(--bg-card);border-radius:999px;cursor:pointer;font-weight:600;font-size:.85rem;transition:background .2s;color:var(--text-main)}.lang-pill:hover{background:#e5e7eb}.profile-circle{width:36px;height:36px;border-radius:50%;background:#4f46e5;color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer}@media(max-width:768px){.sidebar{display:none}.layout-body{height:calc(100vh - 134px)}.main-content{padding:0rem}}