@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Sans+SC:wght@300;400;500;700&family=Outfit:wght@300;400;500;600;700&display=swap";@import "https://fonts.googleapis.com/css2?family=ZCOOL+XiaoWei&display=swap";:root{--primary:#0072f5;--primary-light:#4ca0ff;--primary-dark:#0053b3;--accent:#ab30e8;--bg-main:#f9fafb;--bg-gradient:linear-gradient(135deg, #f9fafb 0%, #f0f2f5 100%);--surface:#fff;--surface-glass:#ffffffbf;--sidebar-bg:#eaedf0;--text-main:#171d26;--text-muted:#394556;--text-light:#fff;--border:#00000014;--border-glass:#ffffff80;--shadow-sm:0 4px 6px -1px #0000000d, 0 2px 4px -1px #00000008;--shadow-md:0 10px 15px -3px #0000000f, 0 4px 6px -2px #00000008;--shadow-lg:0 20px 25px -5px #00000014, 0 10px 10px -5px #00000005;--shadow-glass:0 8px 32px 0 #1f268712;--radius-sm:8px;--radius-md:16px;--radius-lg:24px;--radius-pill:9999px;--sidebar-width:280px;--transition-fast:.15s cubic-bezier(.4, 0, .2, 1);--transition-normal:.3s 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1.5rem;display:flex;position:fixed;top:0;bottom:0;left:0}.bottom-nav-container{border-radius:var(--radius-pill);z-index:100;gap:.5rem;padding:.5rem;display:flex;position:fixed;bottom:1.5rem;left:50%;transform:translate(-50%)}.flex{display:flex}.flex-col{flex-direction:column;display:flex}.items-center{align-items:center}.justify-between{justify-content:space-between}.gap-2{gap:.5rem}.gap-3{gap:.75rem}.gap-4{gap:1rem}.gap-6{gap:1.5rem}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:.4s ease-out forwards fadeIn}.audio-player-wrapper{border-radius:var(--radius-pill);z-index:100;align-items:center;gap:1.5rem;width:600px;max-width:90%;padding:.75rem 1.5rem;display:flex;position:fixed;bottom:2rem;left:50%;transform:translate(-50%)}@media (width<=768px){.sidebar{display:none!important}.main-content{padding:1.5rem 1.5rem 120px;margin-left:0!important}.bottom-nav-container{display:flex!important}}@media 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0;line-height:1.5}.mmah-py{color:#444;font-size:11px;font-weight:600}.mmah-dots-wrap{margin-top:8px}.mmah-dot{color:#666;margin-right:1px;font-size:8px}.mmah-stroke-num{color:#444;margin-left:4px;font-size:11px;font-weight:600}.mmah-memory{color:#155724;background:#f0faf0;border:1px solid #92cf92;border-radius:10px;margin-top:10px;padding:10px 14px}.mmah-memory-title{color:#2b6a2b;letter-spacing:.05em;text-align:left;margin-bottom:6px;font-size:11px;font-weight:700}.mmah-memory-text{color:#111;text-align:left;font-size:13px;line-height:1.7}.mmah-tip-comp{color:#333;font-size:12px}.mmah-memory-source{color:#555;text-align:right;margin-top:6px;font-size:11px}.tone1{color:#dc143c}.tone2{color:orange}.tone3{color:#32cd32}.tone4{color:#1e90ff}.tone5{color:gray}html.dark .card{background:var(--surface)!important;color:var(--text-main)!important;border-color:var(--border)!important}html.dark .dropdown-btn{background-color:var(--surface)!important;color:var(--text-main)!important;border-color:var(--border)!important}html.dark .dropdown-menu-list{background-color:var(--surface)!important;border-color:var(--border)!important;box-shadow:0 8px 32px #0006!important}html.dark .dropdown-option{color:var(--text-main)!important}html.dark .dropdown-option:hover{background-color:#ffffff0d!important}html.dark .series-btn-unselected,html.dark .hsk-btn-unselected{background-color:var(--surface)!important;color:var(--text-main)!important;border-color:var(--border)!important}html.dark .lesson-grid-container{background-color:var(--bg-main)!important;border-color:var(--border)!important}.dropdown-btn{border:1px solid var(--border);background:var(--surface);color:var(--text-main);min-width:280px;transition:all var(--transition-fast);border-radius:8px;justify-content:space-between;align-items:center;gap:.5rem;padding:.7rem 1.2rem;font-size:.9rem;font-weight:600;display:flex}.dropdown-menu-list{background:var(--surface);border:1px solid var(--border);z-index:100;border-radius:8px;min-width:280px;position:absolute;top:calc(100% + 4px);left:0;overflow:hidden;box-shadow:0 8px 24px #0000001a}.dropdown-option{cursor:pointer;color:var(--text-main);transition:background var(--transition-fast);background:0 0;padding:.7rem 1.2rem;font-weight:500}.dropdown-option:hover{background:#00000005}.dropdown-option.selected{font-weight:700;color:var(--primary)!important;background:#1890ff26!important}.series-btn-selected{border:1px solid var(--primary);color:var(--primary);background:#1890ff26;border-radius:8px;padding:.6rem 1rem;font-size:.9rem;font-weight:700}.series-btn-unselected{border:1px solid var(--border);background:var(--surface);color:var(--text-main);border-radius:8px;padding:.6rem 1rem;font-size:.9rem;font-weight:700}.hsk-btn-selected{border:1px solid var(--primary);background:var(--primary);color:#fff;border-radius:50%;width:52px;height:52px;font-size:.8rem;font-weight:700}.hsk-btn-unselected{border:1px solid var(--border);background:var(--surface);width:52px;height:52px;color:var(--text-main);border-radius:50%;font-size:.8rem;font-weight:700}.lesson-grid-container{background:var(--bg-main);border:1px solid var(--border);border-radius:8px;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:.4rem;max-height:240px;padding:.75rem;display:grid;overflow-y:auto}