:root{--bg-base:#f8fafc;--bg-surface:#fff;--bg-surface-glass:#ffffffeb;--bg-subtle:#f1f5f9;--bg-hover:#e2e8f0;--text-main:#0f172a;--text-muted:#475569;--text-light:#94a3b8;--text-inverse:#fff;--primary:#2563eb;--primary-hover:#1d4ed8;--primary-light:#eff6ff;--primary-dark:#1e40af;--accent-ink:#0f172a;--accent-ink-hover:#1e293b;--accent-gold:#d97706;--accent-gold-bg:#fef3c7;--accent-gold-border:#fde68a;--success:#10b981;--success-light:#ecfdf5;--success-dark:#059669;--danger:#ef4444;--danger-hover:#dc2626;--danger-light:#fef2f2;--danger-dark:#b91c1c;--warning:#f59e0b;--warning-light:#fffbeb;--warning-dark:#b45309;--border-color:#e2e8f0;--border-subtle:#f1f5f9;--border-focus:#2563eb;--radius-xs:6px;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:20px;--radius-full:9999px;--shadow-xs:0 1px 2px 0 #0f172a0a;--shadow-sm:0 1px 3px 0 #0f172a0f, 0 1px 2px -1px #0f172a0a;--shadow-md:0 4px 14px -2px #0f172a12, 0 2px 6px -2px #0f172a08;--shadow-lg:0 12px 28px -6px #0f172a14, 0 4px 10px -2px #0f172a08;--shadow-xl:0 20px 38px -8px #0f172a1a;--nav-scrolled-shadow:0 4px 20px #0f172a0d;--transition-fast:all .15s cubic-bezier(.16, 1, .3, 1);--transition-smooth:all .25s cubic-bezier(.16, 1, .3, 1);--font-family:"Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-serif:var(--font-family);--font-mono:"JetBrains Mono", monospace}[data-theme=dark]{--bg-base:#0b0f19;--bg-surface:#111827;--bg-surface-glass:#111827e0;--bg-subtle:#1e293b;--bg-hover:#334155;--text-main:#f8fafc;--text-muted:#94a3b8;--text-light:#64748b;--text-inverse:#0f172a;--primary:#38bdf8;--primary-hover:#0ea5e9;--primary-light:#38bdf824;--primary-dark:#0284c7;--accent-ink:#f8fafc;--accent-ink-hover:#e2e8f0;--border-color:#1e293b;--border-subtle:#172033;--border-focus:#38bdf8;--shadow-xs:0 1px 2px 0 #0006;--shadow-sm:0 1px 3px 0 #00000080, 0 1px 2px -1px #0000004d;--shadow-md:0 4px 14px -2px #0009, 0 2px 6px -2px #0006;--shadow-lg:0 12px 28px -6px #000000b3, 0 4px 10px -2px #0006;--shadow-xl:0 20px 38px -8px #000c;--nav-scrolled-shadow:0 4px 20px #0009}.tnum{font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-family);color:var(--text-main);background-color:var(--bg-base);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100vh;line-height:1.6}a{color:inherit;transition:var(--transition-fast);text-decoration:none}button,input,textarea,select{font-family:inherit;font-size:inherit;color:inherit}.container{max-width:1240px;margin:0 auto;padding:32px 24px 80px}.nav{z-index:1000;background:var(--bg-surface-glass);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--border-color);transition:box-shadow .2s,background .2s;position:sticky;top:0}.nav.scrolled{box-shadow:var(--nav-scrolled-shadow);background:var(--bg-surface-glass)}.nav-inner{justify-content:space-between;align-items:center;gap:24px;max-width:1240px;margin:0 auto;padding:14px 24px;display:flex}.logo{letter-spacing:-.6px;color:var(--text-main);align-items:center;gap:10px;font-size:20px;font-weight:800;text-decoration:none;display:flex}.logo-icon{background:var(--primary);color:#fff;border-radius:9px;justify-content:center;align-items:center;width:32px;height:32px;transition:transform .2s;display:flex}.logo:hover .logo-icon{transform:scale(1.05)}.nav-links{align-items:center;gap:18px;display:flex}.nav-links a:not(.btn){color:var(--text-muted);border-radius:var(--radius-sm);transition:var(--transition-fast);padding:7px 12px;font-size:13.5px;font-weight:600}.nav-links a:not(.btn):hover{color:var(--text-main);background:var(--bg-subtle)}.nav-links a:not(.btn).active{color:var(--text-main);background:var(--bg-subtle);font-weight:700}.cart-nav-link{align-items:center;gap:6px;display:inline-flex;position:relative}.cart-count-badge{background:var(--primary);color:#fff;border-radius:var(--radius-full);text-align:center;min-width:18px;padding:2px 7px;font-size:11px;font-weight:800;line-height:1.2;box-shadow:0 2px 6px #2563eb40}[data-theme=dark] .cart-count-badge{color:#0b0f19;background:#38bdf8;box-shadow:0 2px 8px #38bdf859}.user-nav-profile{background:var(--bg-subtle);border:1px solid var(--border-color);border-radius:var(--radius-full);align-items:center;gap:8px;padding:4px 10px 4px 6px;font-size:12.5px;font-weight:600;display:inline-flex}.user-avatar-initial{background:var(--primary);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:26px;height:26px;font-size:11.5px;font-weight:800;display:flex}[data-theme=dark] 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#e11d4833;color:#fff!important}.btn.danger:hover{background:var(--danger-hover);transform:translateY(-2px);box-shadow:0 6px 16px #e11d484d}.btn.success{background:var(--success);box-shadow:0 2px 6px #10b98133;color:#fff!important}.btn.success:hover{background:var(--success-dark);transform:translateY(-2px);box-shadow:0 6px 16px #10b9814d}.btn-glow{background:var(--primary);box-shadow:0 4px 14px #2563eb40;color:#fff!important}.btn-glow:hover{background:var(--primary-hover);transform:translateY(-2px);box-shadow:0 8px 22px #2563eb59}.nav-btn-register{background:var(--primary)!important;color:#fff!important;border-radius:var(--radius-full)!important;padding:8px 18px!important;box-shadow:0 2px 8px #2563eb33!important}.nav-btn-register:hover{transform:translateY(-1px);background:var(--primary-hover)!important}.nav-btn-login,.nav-btn-logout{background:var(--bg-surface)!important;color:var(--text-main)!important;border:1px solid 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0}}.skeleton{border-radius:var(--radius-sm);background:linear-gradient(90deg,#f0f4f8 25%,#e8edf3 50%,#f0f4f8 75%) 0 0/700px 100%;animation:1.6s ease-in-out infinite shimmer}.skeleton-card{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow-xs);overflow:hidden}.skeleton-thumb{width:100%;height:180px}.skeleton-body{gap:12px;padding:22px;display:grid}.skeleton-line{border-radius:var(--radius-xs);height:14px}.skeleton-line.short{width:40%}.skeleton-line.medium{width:70%}.skeleton-line.full{width:100%}.skeleton-line.tall{height:20px}.skeleton-circle{border-radius:50%;width:36px;height:36px}.toast{border-radius:var(--radius-md);max-width:380px;box-shadow:var(--shadow-lg);pointer-events:all;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);align-items:center;gap:12px;padding:14px 20px;font-size:14px;font-weight:600;animation:.35s cubic-bezier(.16,1,.3,1) toastSlideIn;display:flex}.toast.exiting{animation:.25s ease-in forwards toastSlideOut}@keyframes toastSlideIn{0%{opacity:0;transform:translate(40px)scale(.95)}to{opacity:1;transform:translate(0)scale(1)}}@keyframes toastSlideOut{0%{opacity:1;transform:translate(0)}to{opacity:0;transform:translate(40px)}}.grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px;display:grid}.card{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow-xs);transition:var(--transition-smooth);padding:24px;position:relative;overflow:hidden}.card:hover{box-shadow:var(--shadow-sm);border-color:#cbd5e1}.course-card{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-lg);flex-direction:column;height:100%;transition:transform .25s,box-shadow .25s,border-color .25s;display:flex;position:relative;overflow:hidden;box-shadow:0 2px 6px #141c1a08}.course-card:hover{box-shadow:var(--shadow-lg);border-color:var(--primary);transform:translateY(-4px)}.course-thumbnail-box{background:var(--bg-subtle);width:100%;height:184px;position:relative;overflow:hidden}.course-thumbnail-box img{object-fit:cover;width:100%;height:100%;transition:transform .5s cubic-bezier(.16,1,.3,1)}.course-card:hover .course-thumbnail-box img{transform:scale(1.05)}.course-thumbnail-overlay-badge{z-index:2;position:absolute;top:12px;left:12px}.course-enrolled-badge{z-index:2;color:#fff;border-radius:var(--radius-full);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#2563ebeb;border:1px solid #ffffff40;align-items:center;gap:4px;padding:4px 10px;font-size:10.5px;font-weight:700;display:flex;position:absolute;top:12px;right:12px}.course-quick-actions{opacity:0;z-index:5;align-items:center;gap:6px;transition:all .25s cubic-bezier(.16,1,.3,1);display:flex;position:absolute;bottom:10px;right:10px;transform:translateY(6px)}.course-card:hover .course-quick-actions{opacity:1;transform:translateY(0)}.quick-action-pill{-webkit-backdrop-filter:blur(12px);border-radius:var(--radius-full);cursor:pointer;background:#0f172ac7;border:1px solid #fff3;align-items:center;gap:4px;padding:5px 11px;font-size:11.5px;font-weight:600;text-decoration:none;transition:all .2s;display:inline-flex;box-shadow:0 4px 14px #0000004d;color:#fff!important}.quick-action-pill:hover{background:var(--primary);border-color:#fff6;transform:translateY(-1px);color:#fff!important}.quick-action-pill.bookmark-btn{border-radius:50%;padding:6px}.quick-action-pill.bookmark-btn.active{background:#f59e0b;border-color:#f59e0b;color:#fff!important}.course-content-body{flex-direction:column;flex:1;padding:22px;display:flex}.course-title-link{font-family:var(--font-family);color:var(--text-main);transition:var(--transition-fast);-webkit-line-clamp:2;-webkit-box-orient:vertical;margin-bottom:8px;font-size:1.15rem;font-weight:700;line-height:1.35;display:-webkit-box;overflow:hidden}.course-title-link:hover{color:var(--primary)}.course-desc-snippet{color:var(--text-muted);-webkit-line-clamp:2;-webkit-box-orient:vertical;flex-grow:1;margin-bottom:18px;font-size:13.5px;line-height:1.6;display:-webkit-box;overflow:hidden}.course-meta-row{border-bottom:1px solid var(--border-color);color:var(--text-muted);justify-content:space-between;align-items:center;margin-bottom:14px;padding-bottom:14px;font-size:13px;display:flex}.instructor-pill{align-items:center;gap:8px;display:flex}.instructor-avatar-circle{background:var(--primary);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:26px;height:26px;font-size:11px;font-weight:800;display:flex}.course-footer-row{justify-content:space-between;align-items:center;margin-top:auto;display:flex}.price-tag{color:var(--primary);letter-spacing:-.3px;font-size:17.5px;font-weight:800}.price-tag.free{color:var(--success);background:var(--success-light);border-radius:var(--radius-xs);padding:4px 10px;font-size:13.5px;font-weight:800}.badge{background:var(--primary-light);color:var(--primary);border-radius:var(--radius-full);letter-spacing:.2px;align-items:center;gap:5px;padding:4px 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