:root{--primary-50: #eff6ff;--primary-100: #dbeafe;--primary-200: #bfdbfe;--primary-300: #93c5fd;--primary-400: #60a5fa;--primary-500: #3b82f6;--primary-600: #2563eb;--primary-700: #1d4ed8;--primary-800: #1e40af;--primary-900: #1e3a8a;--accent-speaking: #3b82f6;--accent-listening: #10b981;--accent-writing: #8b5cf6;--accent-thptqg: #f59e0b;--accent-toeic: #ec4899;--surface-bg: #f8fafc;--surface-card: #ffffff;--surface-subtle: #f1f5f9;--surface-border: #e2e8f0;--text-main: #0f172a;--text-muted: #64748b;--text-subtle: #94a3b8;--text-inverse: #ffffff;--status-success: #10b981;--status-warning: #f59e0b;--status-danger: #ef4444;--status-info: #0ea5e9;--font-sans: "Plus Jakarta Sans", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 24px;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .07), 0 2px 4px -2px rgba(0, 0, 0, .05);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .08), 0 4px 6px -4px rgba(0, 0, 0, .04);--shadow-glow: 0 0 25px -5px rgba(37, 99, 235, .2);--transition-fast: .15s ease;--transition-normal: .25s cubic-bezier(.4, 0, .2, 1)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--surface-bg);color:var(--text-main);line-height:1.6;-webkit-font-smoothing:antialiased;min-height:100vh;overflow-x:hidden}.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}.header{position:sticky;top:0;z-index:50;background:#ffffffd9;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--surface-border);padding:.875rem 0}.header-inner{display:flex;justify-content:space-between;align-items:center}.brand-logo{display:flex;align-items:center;gap:.75rem;text-decoration:none;font-weight:800;font-size:1.25rem;color:var(--primary-700)}.nav-links{display:flex;align-items:center;gap:1.25rem;list-style:none}.nav-link{text-decoration:none;color:var(--text-muted);font-weight:600;font-size:.95rem;padding:.5rem .75rem;border-radius:var(--radius-sm);transition:var(--transition-fast)}.nav-link:hover,.nav-link.active{color:var(--primary-600);background-color:var(--primary-50)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.625rem 1.25rem;font-size:.95rem;font-weight:600;border-radius:var(--radius-md);border:1px solid transparent;cursor:pointer;transition:var(--transition-fast);text-decoration:none}.btn-primary{background-color:var(--primary-600);color:var(--text-inverse)}.btn-primary:hover{background-color:var(--primary-700);box-shadow:var(--shadow-glow)}.btn-outline{background:transparent;border-color:var(--surface-border);color:var(--text-main)}.btn-outline:hover{border-color:var(--primary-400);background:var(--surface-subtle)}.btn-danger{background-color:var(--status-danger);color:var(--text-inverse)}.hero{padding:4.5rem 0 3.5rem;text-align:center;background:radial-gradient(circle at 50% 0%,#eff6ff,#f8fafc 70%)}.hero-badge{display:inline-flex;align-items:center;gap:.5rem;padding:.375rem 1rem;background:var(--primary-100);color:var(--primary-800);font-size:.85rem;font-weight:700;border-radius:var(--radius-full);margin-bottom:1.5rem}.hero-title{font-size:3rem;font-weight:800;line-height:1.2;letter-spacing:-.02em;margin-bottom:1.25rem;color:var(--text-main)}.hero-title span{color:var(--primary-600)}.hero-subtitle{font-size:1.2rem;color:var(--text-muted);max-width:650px;margin:0 auto 2rem}.grid-5{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1.5rem}.card{background:var(--surface-card);border:1px solid var(--surface-border);border-radius:var(--radius-lg);padding:1.5rem;box-shadow:var(--shadow-sm);transition:var(--transition-normal);display:flex;flex-direction:column}.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--primary-200)}.card-badge{align-self:flex-start;padding:.25rem .625rem;font-size:.75rem;font-weight:700;border-radius:var(--radius-full);text-transform:uppercase;margin-bottom:1rem}.card-title{font-size:1.25rem;font-weight:700;margin-bottom:.5rem}.card-desc{font-size:.9rem;color:var(--text-muted);flex-grow:1;margin-bottom:1.25rem}.form-group{margin-bottom:1.25rem}.form-label{display:block;font-size:.875rem;font-weight:600;margin-bottom:.375rem;color:var(--text-main)}.form-control{width:100%;padding:.625rem .875rem;font-size:.95rem;font-family:inherit;border:1px solid var(--surface-border);border-radius:var(--radius-md);background:var(--surface-card);transition:var(--transition-fast)}.form-control:focus{outline:none;border-color:var(--primary-500);box-shadow:0 0 0 3px var(--primary-100)}.state-container{text-align:center;padding:3rem 1.5rem;background:var(--surface-card);border:1px dashed var(--surface-border);border-radius:var(--radius-lg);margin:1.5rem 0}.state-icon{width:48px;height:48px;margin:0 auto 1rem;color:var(--text-muted)}.spinner{width:36px;height:36px;border:3px solid var(--primary-100);border-top-color:var(--primary-600);border-radius:50%;animation:spin .8s linear infinite;margin:0 auto 1rem}@keyframes spin{to{transform:rotate(360deg)}}.footer{margin-top:5rem;border-top:1px solid var(--surface-border);padding:2.5rem 0;background:var(--surface-card);font-size:.875rem;color:var(--text-muted);text-align:center}@media(max-width:768px){.hero-title{font-size:2.2rem}.nav-links{gap:.5rem}.grid-5{grid-template-columns:1fr}}