:root[data-theme=dark]{--bg-primary:#0f172a;--bg-secondary:#1e293ba6;--bg-tertiary:#33415580;--border-color:#ffffff14;--border-hover:#c084fc4d;--text-primary:#f8fafc;--text-secondary:#94a3b8;--text-tertiary:#64748b;--glass-bg:linear-gradient(135deg, #1e293bb3 0%, #0f172acc 100%);--glass-border:#ffffff0f;--shadow-sm:0 4px 12px #0006;--shadow-md:0 12px 40px #00000080;--shadow-lg:0 24px 60px #0009;--glow-color:#c084fc40;--card-glow-color:#93c5fd26;--bg-mesh:radial-gradient(circle at 10% 20%, #c084fc1a 0%, transparent 40%), radial-gradient(circle at 90% 80%, #93c5fd14 0%, transparent 40%), linear-gradient(#ffffff02 1px, transparent 1px), linear-gradient(90deg, #ffffff02 1px, transparent 1px)}:root[data-theme=light]{--bg-primary:#fffcf9;--bg-secondary:#ffffffd9;--bg-tertiary:#fff5f6cc;--border-color:#fda4af26;--border-hover:#c084fc4d;--text-primary:#334155;--text-secondary:#64748b;--text-tertiary:#94a3b8;--glass-bg:linear-gradient(135deg, #ffffffd9 0%, #fffcf9e6 100%);--glass-border:#fda4af26;--shadow-sm:0 4px 12px #c084fc0a;--shadow-md:0 12px 36px #c084fc14;--shadow-lg:0 24px 60px #c084fc1f;--glow-color:#fda4af26;--card-glow-color:#c084fc1a;--bg-mesh:radial-gradient(circle at 10% 20%, #fda4af0d 0%, transparent 45%), radial-gradient(circle at 90% 80%, #c084fc0a 0%, transparent 45%), linear-gradient(#fda4af04 1px, transparent 1px), linear-gradient(90deg, #c084fc04 1px, transparent 1px)}:root{--accent-purple:#c084fc;--accent-purple-hover:#a855f7;--accent-blue:#93c5fd;--accent-blue-hover:#60a5fa;--accent-indigo:#818cf8;--accent-coral:#fda4af;--accent-rose:#f43f5e;--accent-green:#6ee7b7;--accent-yellow:#fde047;--font-display:Arial, Helvetica, sans-serif;--font-body:Arial, Helvetica, sans-serif;--transition-fast:.12s ease;--transition-normal:.3s cubic-bezier(.16, 1, .3, 1);--transition-slow:.5s cubic-bezier(.16, 1, .3, 1);--radius-sm:8px;--radius-md:12px;--radius-lg:18px;--radius-xl:26px;--sidebar-width:270px;--sidebar-collapsed-width:84px;--topbar-height:74px}*{box-sizing:border-box;margin:0;padding:0;font-family:Arial,Helvetica,sans-serif}body{background-color:var(--bg-primary);background-image:var(--bg-mesh);color:var(--text-primary);font-family:var(--font-body);min-height:100vh;transition:background-color var(--transition-slow), color var(--transition-normal);-webkit-font-smoothing:antialiased;background-size:100% 100%,100% 100%,50px 50px,50px 50px;overflow-x:hidden}h1,h2,h3,h4,h5,h6{font-family:var(--font-display);letter-spacing:-.025em;font-weight:700;line-height:1.2}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:10px}::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}.app-container{min-height:100vh;display:flex;position:relative}.sidebar{width:var(--sidebar-width);background:var(--glass-bg);-webkit-backdrop-filter:blur(30px);border-right:1px solid var(--glass-border);z-index:100;height:100vh;transition:width var(--transition-slow), transform var(--transition-slow);flex-direction:column;display:flex;position:fixed;top:0;left:0}.sidebar.collapsed{width:var(--sidebar-collapsed-width)}.sidebar-brand{height:var(--topbar-height);border-bottom:1px solid var(--glass-border);align-items:center;gap:14px;padding:0 24px;display:flex}.brand-logo-img{object-fit:contain;width:auto;height:38px;transition:all var(--transition-normal);border-radius:4px}.sidebar.collapsed .brand-logo-img{height:32px}.brand-logo-container{background:linear-gradient(135deg, var(--accent-purple), var(--accent-blue));color:#fff;width:38px;height:38px;font-family:var(--font-display);box-shadow:0 0 20px var(--glow-color);border-radius:10px;justify-content:center;align-items:center;font-size:1.35rem;font-weight:700;display:flex}.brand-text{font-family:var(--font-display);background:linear-gradient(135deg, var(--text-primary) 30%, var(--text-secondary) 100%);-webkit-text-fill-color:transparent;white-space:nowrap;letter-spacing:-.5px;transition:opacity var(--transition-fast);-webkit-background-clip:text;font-size:1.3rem;font-weight:700}.sidebar.collapsed .brand-text{opacity:0;pointer-events:none;width:0}.sidebar-menu{flex-direction:column;flex-grow:1;gap:6px;padding:20px 14px;list-style:none;display:flex;overflow-y:auto}.sidebar-item{color:var(--text-secondary);border-radius:var(--radius-md);cursor:pointer;text-align:left;width:100%;transition:all var(--transition-normal);background:0 0;border:1px solid #0000;align-items:center;gap:16px;padding:12px 16px;font-size:.95rem;font-weight:500;display:flex;position:relative}.sidebar-item:hover{color:var(--text-primary);background:#ffffff05;border-color:#ffffff08}.sidebar-item.active{color:var(--text-primary);background:linear-gradient(135deg,#7c3aed26 0%,#06b6d414 100%);border:1px solid #7c3aed40;font-weight:600;box-shadow:0 4px 15px #0003}.sidebar-item.active:before{content:"";background:linear-gradient(to bottom, var(--accent-purple), var(--accent-blue));border-radius:0 4px 4px 0;width:4px;height:50%;position:absolute;top:25%;left:0}.sidebar-icon{transition:transform var(--transition-normal);flex-shrink:0}.sidebar-item:hover .sidebar-icon{transform:translateY(-1px)scale(1.05)}.sidebar-label{white-space:nowrap;transition:opacity var(--transition-fast)}.sidebar.collapsed .sidebar-label{opacity:0;pointer-events:none;width:0}.sidebar-footer{border-top:1px solid var(--glass-border);padding:16px}.user-profile-small{border-radius:var(--radius-md);border:1px solid var(--border-color);background:#ffffff04;align-items:center;gap:12px;padding:10px;display:flex}.avatar-small{background:linear-gradient(135deg, var(--accent-coral), var(--accent-rose));color:#fff;border-radius:50%;justify-content:center;align-items:center;width:34px;height:34px;font-size:.9rem;font-weight:700;display:flex}.user-name-small{color:var(--text-primary);white-space:nowrap;text-overflow:ellipsis;font-size:.85rem;font-weight:600;overflow:hidden}.sidebar.collapsed .user-profile-small{background:0 0;border-color:#0000;justify-content:center;padding:0}.sidebar.collapsed .user-profile-small .user-name-small{display:none}.main-content{margin-left:var(--sidebar-width);min-height:100vh;transition:margin-left var(--transition-slow);flex-direction:column;flex-grow:1;display:flex}.main-content.collapsed{margin-left:var(--sidebar-collapsed-width)}.topbar{height:var(--topbar-height);background:var(--glass-bg);-webkit-backdrop-filter:blur(28px)saturate(180%);border-bottom:1px solid var(--border-color);z-index:99;box-shadow:var(--shadow-sm);justify-content:space-between;align-items:center;padding:0 40px;display:flex;position:sticky;top:0}.topbar-left{align-items:center;gap:20px;display:flex}.toggle-sidebar-btn{border:1px solid var(--border-color);color:var(--text-secondary);cursor:pointer;width:36px;height:36px;transition:all var(--transition-fast);background:0 0;border-radius:8px;justify-content:center;align-items:center;display:flex}.toggle-sidebar-btn:hover{color:var(--text-primary);background:var(--bg-tertiary);border-color:var(--text-tertiary)}.page-title{letter-spacing:-.5px;font-size:1.45rem;font-weight:700}.topbar-right{align-items:center;gap:16px;display:flex}.xp-pill,.streak-pill{border-radius:var(--radius-xl);box-shadow:var(--shadow-sm);transition:transform var(--transition-normal);border:1px solid;align-items:center;gap:8px;padding:6px 16px;font-size:.85rem;font-weight:700;display:flex}.xp-pill:hover,.streak-pill:hover{transform:translateY(-2px)}.xp-pill{color:#fbbf24;background:linear-gradient(135deg,#f59e0b1f,#fbbf2414);border-color:#f59e0b40}.streak-pill{color:#f43f5e;background:linear-gradient(135deg,#f43f5e1f,#fb718514);border-color:#f43f5e40}.theme-toggle-btn{border:1px solid var(--border-color);color:var(--text-secondary);cursor:pointer;width:36px;height:36px;transition:all var(--transition-fast);background:0 0;border-radius:8px;justify-content:center;align-items:center;display:flex}.theme-toggle-btn:hover{color:var(--text-primary);background:var(--bg-tertiary)}.page-container{flex-direction:column;flex-grow:1;padding:40px;display:flex}.glass-panel{background:var(--glass-bg);-webkit-backdrop-filter:blur(26px)saturate(180%);border:1px solid var(--glass-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:30px;position:relative;overflow:hidden}.glass-panel:after{content:"";pointer-events:none;background:linear-gradient(90deg,#0000,#ffffff1a,#0000);height:1px;position:absolute;top:0;left:0;right:0}.glass-card{border:1px solid var(--border-color);border-radius:var(--radius-md);transition:all var(--transition-normal);box-shadow:var(--shadow-sm);background:#ffffff04;padding:22px}.glass-card:hover{border-color:var(--border-hover);box-shadow:0 16px 36px var(--card-glow-color), var(--shadow-md);background:#ffffff08;transform:translateY(-5px)}.text-gradient{background:linear-gradient(135deg,#c084fc 0%,#06b6d4 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text}.badge{text-transform:uppercase;letter-spacing:.5px;border-radius:6px;align-items:center;gap:6px;padding:6px 12px;font-size:.72rem;font-weight:700;display:inline-flex}.badge-purple{color:#c084fc;background:#7c3aed1f;border:1px solid #7c3aed40}.badge-blue{color:#22d3ee;background:#06b6d41f;border:1px solid #06b6d440}.badge-green{color:#34d399;background:#10b9811f;border:1px solid #10b98140}.btn{border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-normal);font-size:.9rem;font-weight:700;font-family:var(--font-display);border:1px solid #0000;justify-content:center;align-items:center;gap:8px;padding:12px 24px;display:inline-flex}.btn-primary{background:linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-indigo) 100%);color:#fff;box-shadow:0 4px 18px var(--glow-color);position:relative;overflow:hidden}.btn-primary:after{content:"";pointer-events:none;background:linear-gradient(90deg,#0000,#ffffff1a,#0000);width:200%;height:100%;transition:left .75s;position:absolute;top:0;left:-50%;transform:skew(-25deg)}.btn-primary:hover:after{left:125%}.btn-primary:hover{background:linear-gradient(135deg, var(--accent-purple-hover) 0%, var(--accent-indigo) 100%);transform:translateY(-2px);box-shadow:0 6px 24px #7c3aed80}.btn-primary:active{transform:translateY(1px)}.btn-secondary{color:var(--text-primary);border:1px solid var(--border-color);background:#ffffff05}.btn-secondary:hover{border-color:var(--border-hover);background:#ffffff0d;transform:translateY(-1px)}.btn-icon{border-radius:50%;width:44px;height:44px;padding:0}.progress-container{background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:6px;width:100%;height:8px;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--accent-purple), var(--accent-blue));height:100%;transition:width var(--transition-slow);border-radius:6px}@keyframes fadeInUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}.fade-in-up{animation:.4s cubic-bezier(.16,1,.3,1) forwards fadeInUp}@keyframes float{0%{transform:translateY(0)rotate(0)}50%{transform:translateY(-6px)rotate(1deg)}to{transform:translateY(0)rotate(0)}}.float-anim{animation:4s ease-in-out infinite float}.dashboard-grid{grid-template-columns:2fr 1fr;gap:28px;margin-top:28px;display:grid}@media (width<=992px){.dashboard-grid{grid-template-columns:1fr}}.welcome-banner{border-radius:var(--radius-lg);color:#fff;box-shadow:0 10px 30px #7c3aed33, var(--shadow-md);background:linear-gradient(135deg,#4f46e5 0%,#7c3aed 50%,#06b6d4 100%);border:none;justify-content:space-between;align-items:center;padding:38px 42px;display:flex;position:relative;overflow:hidden}.welcome-banner:before{content:"";pointer-events:none;background:radial-gradient(circle,#fff3 0%,#0000 70%);width:250px;height:250px;position:absolute;top:-80px;right:-80px}.welcome-korean{font-family:var(--font-display);color:#c7d2fe;text-transform:uppercase;letter-spacing:.5px;margin-bottom:8px;font-size:1.15rem;font-weight:700}.welcome-title{letter-spacing:-.5px;color:#fff;margin-bottom:8px;font-size:2rem;font-weight:700;line-height:1.3}.welcome-banner p{color:#ffffffe0;font-size:.95rem;line-height:1.5}.welcome-banner .btn{color:#4f46e5;background:#fff;border:1px solid #fff;box-shadow:0 4px 15px #0000001a}.welcome-banner .btn:hover{color:#7c3aed;background:#f8fafc;transform:translateY(-2px);box-shadow:0 6px 20px #00000026}.stats-row{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;margin-top:28px;display:grid}.stat-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);transition:all var(--transition-normal);align-items:center;gap:18px;padding:22px;display:flex}.stat-card:hover{border-color:var(--border-hover);box-shadow:var(--shadow-md), 0 8px 24px #7c3aed0d;transform:translateY(-3px)}.stat-icon{border-radius:12px;justify-content:center;align-items:center;width:52px;height:52px;display:flex;box-shadow:inset 0 0 10px #ffffff05}.stat-val{font-family:var(--font-display);letter-spacing:-.5px;font-size:1.6rem;font-weight:700}.stat-lbl{color:var(--text-secondary);font-size:.82rem;font-weight:500}.streak-calendar-grid{grid-template-columns:repeat(7,1fr);gap:10px;margin-top:16px;display:grid}.streak-day{aspect-ratio:1;background:var(--bg-tertiary);border:1px solid var(--border-color);transition:all var(--transition-normal);border-radius:10px;flex-direction:column;justify-content:center;align-items:center;font-size:.8rem;font-weight:700;display:flex}.streak-day.completed{color:#ff758f;background:linear-gradient(135deg,#f43f5e33 0%,#fb71851a 100%);border-color:#f43f5e66;box-shadow:0 0 12px #f43f5e26}.streak-day.today{border-color:var(--accent-blue);transform:scale(1.05);box-shadow:0 0 12px #06b6d440}.course-selector{flex-wrap:wrap;gap:12px;margin-top:28px;display:flex}.course-tab-btn{background:var(--bg-secondary);border:1px solid var(--border-color);color:var(--text-secondary);border-radius:var(--radius-md);cursor:pointer;font-weight:700;font-family:var(--font-display);transition:all var(--transition-normal);padding:12px 24px;font-size:.95rem}.course-tab-btn:hover{color:var(--text-primary);border-color:var(--text-tertiary)}.course-tab-btn.active{background:var(--accent-purple);border-color:var(--accent-purple);color:#fff;box-shadow:0 6px 20px var(--glow-color);transform:translateY(-1px)}.lessons-list{grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:24px;margin-top:28px;display:grid}.lesson-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-normal);flex-direction:column;gap:14px;padding:24px;display:flex;position:relative;overflow:hidden}.lesson-card:hover{border-color:var(--accent-purple);box-shadow:0 14px 30px var(--glow-color);transform:translateY(-6px)}.lesson-card.completed{border-left:5px solid var(--accent-green)}.lesson-meta{color:var(--text-secondary);font-size:.8rem;font-weight:600}.lesson-detail-view{grid-template-columns:2.2fr 1fr;gap:28px;margin-top:28px;display:grid}@media (width<=992px){.lesson-detail-view{grid-template-columns:1fr}}.video-sim-container{aspect-ratio:16/9;border-radius:var(--radius-md);border:1px solid var(--border-color);width:100%;box-shadow:var(--shadow-lg);background:#020205;position:relative;overflow:hidden}.video-sim-overlay{color:#fff;background:radial-gradient(circle,#0000001a 0%,#0009 100%);flex-direction:column;justify-content:center;align-items:center;gap:18px;display:flex;position:absolute;inset:0}.video-sim-playbtn{background:linear-gradient(135deg, var(--accent-purple), var(--accent-indigo));color:#fff;cursor:pointer;width:70px;height:70px;transition:all var(--transition-normal);border:none;border-radius:50%;justify-content:center;align-items:center;display:flex;box-shadow:0 0 25px #7c3aedb3}.video-sim-playbtn:hover{transform:scale(1.15);box-shadow:0 0 35px #7c3aede6}.tabs-header{border-bottom:2px solid var(--border-color);gap:8px;margin-top:28px;display:flex}.tab-btn{color:var(--text-secondary);cursor:pointer;font-weight:700;font-family:var(--font-display);transition:color var(--transition-fast);background:0 0;border:none;padding:14px 24px;position:relative}.tab-btn:hover,.tab-btn.active{color:var(--text-primary)}.tab-btn.active:after{content:"";background:linear-gradient(90deg, var(--accent-purple), var(--accent-blue));border-radius:3px;height:3px;position:absolute;bottom:-2px;left:0;right:0}.vocab-table,.grammar-table{border-collapse:separate;border-spacing:0 8px;width:100%;margin-top:12px}.vocab-table th,.grammar-table th{text-align:left;font-family:var(--font-display);color:var(--text-secondary);text-transform:uppercase;letter-spacing:1px;border:none;padding:16px;font-size:.85rem;font-weight:700}.vocab-row{border:1px solid var(--border-color);transition:all var(--transition-fast);background:#ffffff03}.vocab-row td{border-top:1px solid var(--border-color);border-bottom:1px solid var(--border-color);padding:16px}.vocab-row td:first-child{border-left:1px solid var(--border-color);border-top-left-radius:var(--radius-sm);border-bottom-left-radius:var(--radius-sm)}.vocab-row td:last-child{border-right:1px solid var(--border-color);border-top-right-radius:var(--radius-sm);border-bottom-right-radius:var(--radius-sm)}.vocab-row:hover{background:#ffffff06}.vocab-kr{color:var(--accent-blue);font-size:1.25rem;font-weight:700;font-family:var(--font-display)}.speaker-btn{border:1px solid var(--border-color);color:var(--text-secondary);cursor:pointer;width:32px;height:32px;transition:all var(--transition-fast);background:#ffffff05;border-radius:50%;justify-content:center;align-items:center;display:inline-flex}.speaker-btn:hover{color:#fff;background:var(--accent-purple);border-color:var(--accent-purple);box-shadow:0 0 10px var(--glow-color);transform:scale(1.1)}.quiz-panel{flex-direction:column;gap:24px;display:flex}.quiz-question{color:var(--text-primary);font-size:1.15rem;font-weight:700;line-height:1.4}.quiz-options-list{flex-direction:column;gap:12px;display:flex}.quiz-option{border:1px solid var(--border-color);border-radius:var(--radius-md);text-align:left;cursor:pointer;color:var(--text-secondary);transition:all var(--transition-normal);background:#ffffff04;padding:16px 24px;font-size:.95rem;font-weight:500}.quiz-option:hover{border-color:var(--text-tertiary);color:var(--text-primary);background:#ffffff09;transform:translate(4px)}.quiz-option.selected{border-color:var(--accent-purple);color:#fff;background:#7c3aed14;box-shadow:0 4px 15px #7c3aed26}.quiz-option.correct{border-color:var(--accent-green);color:#34d399;background:#10b9811a;font-weight:600}.quiz-option.incorrect{border-color:var(--accent-rose);color:#f43f5e;background:#f43f5e1a;font-weight:600}.flashcards-layout{flex-direction:column;align-items:center;gap:28px;max-width:520px;margin:30px auto;display:flex}.flashcard-deck-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:24px;width:100%;display:grid}.deck-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);text-align:center;cursor:pointer;transition:all var(--transition-normal);box-shadow:var(--shadow-sm);padding:30px 24px}.deck-card:hover{border-color:var(--accent-purple);box-shadow:0 20px 40px var(--glow-color);transform:translateY(-8px)}.flashcard-wrapper{perspective:1500px;aspect-ratio:1.5;width:100%}.flashcard-inner{text-align:center;width:100%;height:100%;transform-style:preserve-3d;cursor:pointer;transition:transform .8s cubic-bezier(.175,.885,.32,1.275);position:relative}.flashcard-front,.flashcard-back{backface-visibility:hidden;border-radius:var(--radius-lg);width:100%;height:100%;box-shadow:var(--shadow-lg), 0 30px 60px #0006;border:1px solid #ffffff14;flex-direction:column;justify-content:center;align-items:center;padding:40px;display:flex;position:absolute}.flashcard-front{background:linear-gradient(135deg,#16182e 0%,#0d0e1b 100%);border-top-color:#06b6d44d}.flashcard-back{background:linear-gradient(135deg,#1b1d36 0%,#101124 100%);border-top-color:#7c3aed4d;transform:rotateY(180deg)}.flashcard-kr{font-family:var(--font-display);color:#fff;letter-spacing:-1px;font-size:3.4rem;font-weight:700}.flashcard-roman{color:var(--accent-blue);margin-top:8px;font-size:1.3rem;font-weight:600}.flashcard-meaning{color:var(--accent-coral);letter-spacing:-.5px;font-size:2.1rem;font-weight:700}.flashcard-ex-kr{color:var(--text-primary);font-size:1.05rem;font-weight:500;line-height:1.4}.flashcard-ex-vi{color:var(--text-secondary);margin-top:4px;font-size:.9rem}.test-layout{flex-direction:column;gap:28px;display:flex}.test-grid{grid-template-columns:1.1fr 1fr;gap:28px;display:grid}@media (width<=992px){.test-grid{grid-template-columns:1fr}}.test-left-pane,.test-right-pane{flex-direction:column;gap:24px;max-height:72vh;padding:6px;display:flex;overflow-y:auto}.test-header-bar{background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-md);box-shadow:var(--shadow-md);justify-content:space-between;align-items:center;padding:20px 30px;display:flex}.timer-pill{color:#f43f5e;font-family:var(--font-display);background:#f43f5e1a;border:1px solid #f43f5e33;border-radius:20px;align-items:center;gap:10px;padding:6px 18px;font-size:1.25rem;font-weight:700;display:flex}.test-question-box{border:1px solid var(--border-color);border-radius:var(--radius-md);background:#ffffff03;padding:26px}.audio-sim-player{background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:12px;align-items:center;gap:18px;padding:20px;display:flex}.audio-progress{background:#ffffff0d;border-radius:3px;flex-grow:1;height:6px;overflow:hidden}.audio-progress-fill{background:linear-gradient(90deg, var(--accent-purple), var(--accent-blue))}.question-nav-grid{grid-template-columns:repeat(auto-fill,minmax(42px,1fr));gap:10px;display:grid}.question-nav-btn{aspect-ratio:1;background:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-secondary);transition:all var(--transition-fast);border-radius:8px;font-size:.9rem;font-weight:700}.question-nav-btn.answered{color:#22d3ee;background:#06b6d41f;border-color:#06b6d44d}.question-nav-btn.active{background:var(--accent-purple);border-color:var(--accent-purple);color:#fff;box-shadow:0 0 12px var(--glow-color);transform:scale(1.08)}.ai-space-layout{height:calc(100vh - var(--topbar-height) - 130px);grid-template-columns:1fr 2.8fr;gap:28px;min-height:520px;display:grid}@media (width<=992px){.ai-space-layout{grid-template-columns:1fr;height:auto}}.tutor-bio-card{background:var(--glass-bg);flex-direction:column;justify-content:center;align-items:center;gap:18px;padding:30px;display:flex}.tutor-avatar{background:linear-gradient(135deg, var(--accent-purple), var(--accent-blue));border-radius:50%;justify-content:center;align-items:center;width:106px;height:106px;font-size:3.4rem;display:flex;box-shadow:0 0 25px #7c3aed66}.online-indicator{border:4px solid #0f1122;width:18px;height:18px}.chat-panel{flex-direction:column;height:100%;display:flex}.chat-messages{flex-grow:1;padding:24px}.chat-bubble{box-shadow:var(--shadow-sm);border-radius:16px;padding:14px 20px;font-size:.95rem}.chat-bubble-wrapper.tutor .chat-bubble{border:1px solid var(--border-color);background:#ffffff05;border-top-left-radius:2px}.chat-bubble-wrapper.student .chat-bubble{background:linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-indigo) 100%);border-top-right-radius:2px;box-shadow:0 4px 15px #7c3aed33}.grammar-feedback-box{color:#fbbf24;background:#f59e0b0f;border:1px solid #f59e0b33;border-radius:8px;padding:12px 16px}.suggestion-chips{border-top:1px solid var(--border-color);background:#0000001a;padding:14px 24px}.suggestion-chip{background:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-secondary);transition:all var(--transition-fast);border-radius:20px;padding:8px 16px;font-size:.85rem;font-weight:600}.suggestion-chip:hover{color:#fff;border-color:var(--text-tertiary);background:#ffffff0a;transform:translateY(-1px)}.chat-input-area{border-top:1px solid var(--border-color);background:#00000026;padding:20px 24px}.chat-input{background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--radius-md);transition:all var(--transition-fast);padding:14px 20px}.chat-input:focus{border-color:var(--accent-purple);background:#ffffff05;box-shadow:0 0 0 2px #7c3aed33}.profile-grid{grid-template-columns:1fr 1.8fr;gap:28px;margin-top:28px;display:grid}@media (width<=992px){.profile-grid{grid-template-columns:1fr}}.student-id-card{background:var(--glass-bg);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);padding:40px 30px;position:relative;overflow:hidden}.student-id-card:before{content:"KVN TOPIK CARD";color:#fff;font-family:var(--font-display);background:linear-gradient(90deg,#f43f5e,#fb7185);padding:4px 32px;font-size:.65rem;font-weight:700;position:absolute;top:18px;right:-32px;transform:rotate(45deg);box-shadow:0 2px 10px #f43f5e4d}.student-photo{border:4px solid var(--accent-blue);background:linear-gradient(135deg, var(--accent-coral) 0%, var(--accent-rose) 100%);border-radius:50%;width:130px;height:130px;margin-bottom:20px;font-size:4.5rem;box-shadow:0 8px 24px #06b6d44d}.badge-grid{grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:16px;display:grid}.badge-card-item{background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--radius-md);transition:all var(--transition-normal);padding:16px 12px}.badge-card-item.unlocked{background:#f59e0b08;border-color:#f59e0b59;box-shadow:0 6px 20px #f59e0b14}.badge-medal-icon{font-size:2.5rem}.badge-title-item{font-size:.8rem;font-weight:700;font-family:var(--font-display)}.badge-desc-item{color:var(--text-tertiary);margin-top:4px;font-size:.68rem}.certificate-preview-box{color:#3e3223;border:8px double #b2946c;border-image:initial;background:radial-gradient(circle,#fffdf8 0%,#f6f3e5 100%);border-radius:4px;padding:50px 40px;box-shadow:0 30px 70px #000c}.cert-title{letter-spacing:3px;color:#806137;font-family:Arial,Helvetica,sans-serif;font-size:2.6rem;font-weight:700}.cert-korean-watermark{color:#b2946c0d;font-size:12rem;font-weight:700}.mobile-bottom-nav{display:none}@media (width<=768px){.sidebar{transform:translate(-100%)}.sidebar:not(.collapsed){width:var(--sidebar-width);transform:translate(0)}.main-content{margin-left:0!important}.topbar{padding:0 16px}.page-container{padding:16px 16px 90px}.mobile-bottom-nav{background:var(--glass-bg);-webkit-backdrop-filter:blur(20px);border-top:1px solid var(--glass-border);z-index:101;justify-content:space-around;align-items:center;height:70px;padding:0 12px;display:flex;position:fixed;bottom:0;left:0;right:0;box-shadow:0 -4px 15px #0000000d}.mobile-bottom-nav-item{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;flex-direction:column;flex:1;align-items:center;gap:4px;padding:8px 0;font-size:.75rem;font-weight:500;display:flex}.mobile-bottom-nav-item.active{color:var(--accent-purple);font-weight:700}}.matching-grid{grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px;margin-top:20px;display:grid}.matching-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);font-family:var(--font-display);color:var(--text-primary);text-align:center;cursor:pointer;min-height:100px;box-shadow:var(--shadow-sm);-webkit-user-select:none;user-select:none;justify-content:center;align-items:center;padding:24px 16px;font-weight:600;transition:all .2s;display:flex}.matching-card:hover:not(:disabled){border-color:var(--border-hover);background:#7c3aed0d;transform:translateY(-2px)}.matching-card.selected{border-color:var(--accent-purple);background:#7c3aed26;transform:scale(1.02);box-shadow:0 0 15px #7c3aed4d}.matching-card.matched{border-color:var(--accent-green);opacity:.6;background:#10b9811a;transform:scale(.95)}.matching-card.error{border-color:var(--accent-rose);background:#f43f5e26;animation:.4s ease-in-out shake}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-5px)}50%{transform:translate(5px)}75%{transform:translate(-5px)}}.chart-header-actions{align-items:center;gap:12px;margin-bottom:8px;display:flex}.goal-label{color:var(--text-secondary);font-size:.85rem;font-weight:500}.goal-btn-group{background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--radius-md);gap:2px;padding:3px;display:flex}.goal-btn{color:var(--text-secondary);border-radius:calc(var(--radius-md) - 3px);cursor:pointer;transition:all var(--transition-fast);background:0 0;border:none;padding:4px 10px;font-size:.8rem;font-weight:600}.goal-btn:hover{color:var(--text-primary);background:#ffffff0d}.goal-btn.active{background:var(--accent-purple);color:#fff;box-shadow:0 2px 8px #c084fc4d}.chart-bar-rect{cursor:pointer;transition:fill .3s,filter .3s,opacity .3s}.chart-bar-rect.hovered{filter:brightness(1.1)drop-shadow(0 2px 8px #c084fc66);opacity:.95}.chart-bar-rect.today{stroke:var(--accent-purple-hover);stroke-width:1.5px}.svg-tooltip-group{pointer-events:none;animation:.15s ease-out forwards fadeIn}@keyframes fadeIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.skill-progress-grid{grid-template-columns:repeat(3,1fr);gap:16px;margin-top:10px;display:grid}@media (width<=768px){.skill-progress-grid{grid-template-columns:1fr}}.skill-progress-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);text-align:center;transition:all var(--transition-normal);box-shadow:var(--shadow-sm);flex-direction:column;align-items:center;gap:12px;padding:16px;display:flex}.skill-progress-card:hover{border-color:var(--border-hover);box-shadow:var(--shadow-md);background:#ffffff05;transform:translateY(-4px)}.radial-progress-circle{transform:rotate(-90deg)}.circle-bg{stroke:var(--bg-tertiary);opacity:.4}.circle-progress{transition:stroke-dashoffset .8s cubic-bezier(.4,0,.2,1)}.goal-meter-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:all var(--transition-normal);align-items:center;gap:20px;margin-bottom:16px;padding:20px;display:flex}.goal-meter-card:hover{border-color:var(--border-hover);box-shadow:var(--shadow-md)}.goal-meter-info{flex:1}.goal-meter-title{align-items:center;gap:6px;margin-bottom:4px;font-size:1.05rem;font-weight:700;display:flex}.goal-meter-desc{color:var(--text-secondary);font-size:.85rem;line-height:1.4}.analytics-container{grid-template-columns:1.2fr 1fr;gap:24px;margin:24px 0;display:grid}@media (width<=1024px){.analytics-container{grid-template-columns:1fr}}.cloud-status-pill{border-radius:var(--radius-lg);transition:all var(--transition-fast);border:1px solid #0000;align-items:center;gap:6px;padding:6px 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scaleUp;position:relative}@keyframes scaleUp{0%{opacity:0;transform:scale(.95)translateY(10px)}to{opacity:1;transform:scale(1)translateY(0)}}.auth-modal-close{color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast);background:0 0;border:none;border-radius:50%;padding:4px;position:absolute;top:20px;right:20px}.auth-modal-close:hover{background:var(--bg-tertiary);color:var(--text-primary)}.auth-input-group{flex-direction:column;gap:8px;margin-bottom:16px;display:flex}.auth-input{background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--radius-md);width:100%;color:var(--text-primary);transition:all var(--transition-fast);padding:12px 16px;font-size:.9rem}.auth-input:focus{border-color:var(--accent-purple);outline:none;box-shadow:0 0 10px #c084fc26}.spin-anim{animation:1s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}@media (width<=500px){.page-title{display:none}.topbar{padding:0 12px}.topbar-left{margin-right:auto}.cloud-lbl{display:none}.cloud-status-pill{padding:6px 8px}.streak-pill,.xp-pill{padding:6px 10px}.streak-pill span,.xp-pill span{font-size:.8rem}.welcome-banner{text-align:center;flex-direction:column;gap:16px;padding:24px 20px}.welcome-banner p{font-size:.85rem}.welcome-korean{font-size:.8rem}.welcome-title{font-size:1.25rem}.welcome-banner .btn{justify-content:center;width:100%}.stats-row{grid-template-columns:repeat(2,1fr);gap:12px}.stat-card{padding:12px}.stat-icon{width:38px;height:38px}.stat-icon svg{width:18px;height:18px}.stat-val{font-size:1.1rem}.stat-lbl{font-size:.7rem}.goal-meter-card{text-align:center;flex-direction:column;gap:12px;padding:16px}.chart-header-actions{justify-content:space-between;width:100%}.goal-label{display:none}.goal-btn-group{justify-content:space-between;width:100%}.goal-btn{text-align:center;flex:1}.skill-progress-grid{gap:12px}.skill-progress-card{text-align:left;flex-direction:row;justify-content:flex-start;padding:12px}.streak-calendar-grid{gap:4px}.streak-day{padding:8px 4px}.glass-card{padding:12px!important}.analytics-container{margin:16px 0}.chart-wrapper{height:200px!important}}.sidebar-overlay{display:none}@media (width<=768px){.sidebar-overlay.active{z-index:99;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#0006;display:block;position:fixed;inset:0}}@media (width<=500px){.podium-container{gap:8px!important}.podium-item{max-width:32vw!important}.podium-name{white-space:nowrap;text-overflow:ellipsis;width:100%;padding:0 4px;overflow:hidden;font-size:.75rem!important}}.leaderboard-title{margin-bottom:8px;font-size:2.2rem}.leaderboard-desc{font-size:1rem}@media (width<=500px){.leaderboard-title{font-size:1.5rem}.leaderboard-desc{font-size:.85rem}}body{overscroll-behavior-y:none}*{-webkit-tap-highlight-color:transparent}.mobile-bottom-nav,.topbar,.toggle-sidebar-btn,.streak-pill,.xp-pill{-webkit-user-select:none;user-select:none}.page-container,.chat-messages,.sidebar-menu{-webkit-overflow-scrolling:touch}@media (width<=768px){.chat-panel{height:calc(100vh - 250px);margin-top:16px}button.action-btn{min-height:44px}.glass-card,.glass-panel{padding:16px!important}.modal-content{width:90%;max-height:85vh;margin:auto;overflow-y:auto}}