/* ============================================
   CLS ĐGNL – Design System 2026
   Hệ thống Đánh Giá Năng Lực
   Modern · Aurora · Glass · Animated
   ============================================ */

/* ===== Google Fonts Import ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&display=swap');

/* ===== CSS Variables ===== */
:root {
    /* Colors – Light Vibrant Theme */
    --bg-primary: #f4f6fb;
    --bg-secondary: #ffffff;
    --bg-tertiary: #eef1f8;
    --bg-card: rgba(255, 255, 255, 0.72);
    --bg-card-solid: #ffffff;
    --bg-input: rgba(241, 245, 252, 0.9);

    --border-color: rgba(99, 102, 241, 0.12);
    --border-focus: rgba(99, 102, 241, 0.5);
    --border-hover: rgba(99, 102, 241, 0.3);

    --text-primary: #0f172a;
    --text-secondary: #3e4c63;
    --text-muted: #64748b;
    --text-dim: #94a3b8;

    --accent-primary: #6366f1;
    --accent-primary-hover: #4f46e5;
    --accent-secondary: #8b5cf6;
    --accent-tertiary: #0891b2;
    --accent-success: #059669;
    --accent-warning: #d97706;
    --accent-danger: #dc2626;
    --accent-info: #2563eb;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1, #a855f7);
    --gradient-secondary: linear-gradient(135deg, #06b6d4, #3b82f6);
    --gradient-success: linear-gradient(135deg, #10b981, #059669);
    --gradient-warning: linear-gradient(135deg, #f59e0b, #d97706);
    --gradient-danger: linear-gradient(135deg, #ef4444, #dc2626);
    --gradient-hero: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(168, 85, 247, 0.05), rgba(6, 182, 212, 0.04));
    --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.8), rgba(255,255,255,0.45));
    --gradient-aurora: linear-gradient(135deg, #667eea 0%, #764ba2 25%, #f093fb 50%, #4facfe 75%, #00f2fe 100%);

    /* Shadows – Colored soft */
    --shadow-sm: 0 2px 12px rgba(99, 102, 241, 0.06);
    --shadow-md: 0 4px 24px rgba(99, 102, 241, 0.08);
    --shadow-lg: 0 12px 40px rgba(99, 102, 241, 0.1);
    --shadow-glow: 0 0 50px rgba(99, 102, 241, 0.08);
    --shadow-glow-strong: 0 0 80px rgba(99, 102, 241, 0.14);
    --shadow-card: 0 4px 24px rgba(99, 102, 241, 0.06), 0 1px 3px rgba(0,0,0,0.04);
    --shadow-card-hover: 0 12px 40px rgba(99, 102, 241, 0.12), 0 4px 12px rgba(0,0,0,0.04);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;

    /* Radius – Rounder for 2026 */
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 50px;

    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Layout */
    --max-width: 1200px;
    --sidebar-width: 260px;
    --header-height: 68px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-primary-hover);
}

img {
    max-width: 100%;
    display: block;
}

/* ===== Animated Aurora Background ===== */
.bg-pattern {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background:
        radial-gradient(ellipse 80% 60% at 10% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 60%),
        radial-gradient(ellipse 60% 80% at 80% 80%, rgba(168, 85, 247, 0.07) 0%, transparent 55%),
        radial-gradient(ellipse 70% 50% at 50% 10%, rgba(6, 182, 212, 0.05) 0%, transparent 60%),
        radial-gradient(ellipse 50% 70% at 90% 30%, rgba(236, 72, 153, 0.04) 0%, transparent 55%);
    pointer-events: none;
    z-index: 0;
    animation: auroraShift 20s ease-in-out infinite alternate;
}

@keyframes auroraShift {
    0% { filter: hue-rotate(0deg); opacity: 1; }
    50% { filter: hue-rotate(15deg); opacity: 0.9; }
    100% { filter: hue-rotate(-10deg); opacity: 1; }
}

.bg-grid {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image:
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: 0;
    mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 20%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 20%, transparent 80%);
}

/* ===== Floating Decorative Orbs ===== */
.orb {
    position: fixed;
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
    filter: blur(60px);
    opacity: 0.35;
}

.orb-1 {
    width: 350px; height: 350px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(168, 85, 247, 0.15));
    top: 5%; left: 5%;
    animation: orbFloat1 18s ease-in-out infinite;
}

.orb-2 {
    width: 280px; height: 280px;
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.18), rgba(59, 130, 246, 0.12));
    top: 60%; right: 5%;
    animation: orbFloat2 22s ease-in-out infinite;
}

.orb-3 {
    width: 200px; height: 200px;
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.15), rgba(245, 158, 11, 0.1));
    bottom: 15%; left: 30%;
    animation: orbFloat3 16s ease-in-out infinite;
}

@keyframes orbFloat1 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(40px, -30px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

@keyframes orbFloat2 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(-30px, 25px) scale(0.95); }
    66% { transform: translate(25px, -35px) scale(1.05); }
}

@keyframes orbFloat3 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -20px) scale(1.08); }
}

/* ===== Layout ===== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-xl);
    position: relative;
    z-index: 1;
}

.page-wrapper {
    position: relative;
    z-index: 1;
}

/* ===== Header / Navbar – Frosted Glass ===== */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid rgba(99, 102, 241, 0.08);
    z-index: 1000;
    display: flex;
    align-items: center;
    box-shadow: 0 1px 12px rgba(99, 102, 241, 0.04);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
    font-size: 1.3rem;
    color: var(--text-primary);
}

.navbar-brand .logo-icon {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

.navbar-brand span {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
}

.navbar-nav a {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.navbar-nav a:hover {
    color: var(--text-primary);
    background: rgba(99, 102, 241, 0.06);
}

.navbar-nav a.active {
    color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.08);
    font-weight: 600;
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* ===== Buttons – 2026 Style ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 26px;
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: 14px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    line-height: 1.4;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    top: 0; left: -100%; right: 0; bottom: 0;
    width: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.btn:hover::after {
    left: 100%;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 18px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.35);
}

.btn-secondary {
    background: rgba(99, 102, 241, 0.08);
    color: var(--accent-primary);
    border: 1px solid rgba(99, 102, 241, 0.15);
}

.btn-secondary:hover {
    background: rgba(99, 102, 241, 0.14);
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    color: var(--accent-primary);
    border-color: var(--border-hover);
    background: rgba(99, 102, 241, 0.04);
    transform: translateY(-1px);
}

.btn-success {
    background: var(--gradient-success);
    color: white;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.25);
}

.btn-warning {
    background: var(--gradient-warning);
    color: white;
}

.btn-danger {
    background: var(--gradient-danger);
    color: white;
}

.btn-lg {
    padding: 14px 34px;
    font-size: 16px;
    border-radius: var(--radius-lg);
}

.btn-sm {
    padding: 7px 16px;
    font-size: 13px;
    border-radius: var(--radius-sm);
}

.btn-icon {
    width: 42px;
    height: 42px;
    padding: 0;
    border-radius: var(--radius-md);
}

/* ===== Cards – Animated Glass ===== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    backdrop-filter: blur(20px) saturate(160%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-card);
    position: relative;
}

.card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
}

.card-glass {
    background: var(--gradient-glass);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border: 1px solid rgba(99, 102, 241, 0.1);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.card-body {
    color: var(--text-secondary);
}

/* ===== Stat Cards – Animated Border ===== */
.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    backdrop-filter: blur(20px) saturate(160%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    transition: all var(--transition-bounce);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.stat-card:hover::before {
    transform: scaleX(1);
}

.stat-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-card-hover);
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: var(--space-md);
}

.stat-value {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.2;
    margin-bottom: 4px;
    letter-spacing: -0.5px;
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

.stat-change {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    margin-top: 8px;
}

.stat-change.positive {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-success);
}

.stat-change.negative {
    background: rgba(239, 68, 68, 0.1);
    color: var(--accent-danger);
}

/* ===== Form Elements ===== */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-input {
    width: 100%;
    padding: 12px 18px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 14px;
    transition: all var(--transition-fast);
    outline: none;
}

.form-input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.08);
    background: #fff;
}

.form-input::placeholder {
    color: var(--text-dim);
}

select.form-input {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
}

/* ===== Tags / Badges ===== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
}

.badge-primary {
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-primary);
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-success);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--accent-warning);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--accent-danger);
}

.badge-info {
    background: rgba(6, 182, 212, 0.1);
    color: var(--accent-tertiary);
}

.badge-premium {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.12), rgba(236, 72, 153, 0.08));
    color: var(--accent-warning);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

/* ===== Data Table ===== */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table thead th {
    background: rgba(99, 102, 241, 0.05);
    color: var(--text-muted);
    font-weight: 600;
    font-size: 13px;
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table tbody td {
    padding: 14px 16px;
    border-bottom: 1px solid rgba(99, 102, 241, 0.05);
    font-size: 14px;
    color: var(--text-secondary);
}

.data-table tbody tr {
    transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
    background: rgba(99, 102, 241, 0.03);
}

/* ===== Progress Bar ===== */
.progress-bar {
    width: 100%;
    height: 8px;
    background: rgba(99, 102, 241, 0.08);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: progressShimmer 2s ease-in-out infinite;
}

@keyframes progressShimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.progress-fill.success { background: var(--gradient-success); }
.progress-fill.warning { background: var(--gradient-warning); }
.progress-fill.danger { background: var(--gradient-danger); }

/* ===== Sidebar Layout ===== */
.app-layout {
    display: flex;
    min-height: 100vh;
    padding-top: var(--header-height);
}

.sidebar {
    width: var(--sidebar-width);
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-right: 1px solid var(--border-color);
    padding: var(--space-lg) var(--space-md);
    overflow-y: auto;
    z-index: 100;
}

.sidebar-nav {
    list-style: none;
}

.sidebar-nav li {
    margin-bottom: 4px;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border-radius: var(--radius-md);
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.sidebar-nav a:hover {
    background: rgba(99, 102, 241, 0.06);
    color: var(--text-primary);
}

.sidebar-nav a.active {
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-primary);
    font-weight: 600;
    box-shadow: inset 3px 0 0 var(--accent-primary);
}

.sidebar-nav a .nav-icon {
    width: 20px;
    text-align: center;
    font-size: 16px;
}

.sidebar-section-title {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    padding: 16px 14px 8px;
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: var(--space-xl);
    min-height: calc(100vh - var(--header-height));
}

/* ===== Hero Section – 2026 ===== */
.hero {
    position: relative;
    padding: clamp(80px, 12vw, 130px) 0 clamp(60px, 8vw, 90px);
    overflow: hidden;
    text-align: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background:
        radial-gradient(ellipse 90% 80% at 30% 30%, rgba(99, 102, 241, 0.1) 0%, transparent 60%),
        radial-gradient(ellipse 70% 70% at 70% 70%, rgba(168, 85, 247, 0.07) 0%, transparent 55%);
    pointer-events: none;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 22px;
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.15);
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: 28px;
    backdrop-filter: blur(10px);
}

.hero h1 {
    font-size: clamp(2.2rem, 5vw, 3.8rem);
    font-weight: 900;
    line-height: 1.12;
    margin-bottom: 22px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    letter-spacing: -0.5px;
}

.hero h1 .gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero .subtitle {
    font-size: clamp(1rem, 1.5vw, 1.18rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 48px;
    justify-content: center;
    margin-top: 72px;
    flex-wrap: wrap;
}

.hero-stat {
    text-align: center;
}

.hero-stat .value {
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.hero-stat .label {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ===== Section ===== */
.section {
    padding: clamp(48px, 8vw, 88px) 0;
}

.section-header {
    text-align: center;
    margin-bottom: 52px;
}

.section-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 18px;
    background: rgba(99, 102, 241, 0.08);
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: 18px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.section-title {
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    font-weight: 800;
    margin-bottom: 14px;
    letter-spacing: -0.3px;
}

.section-desc {
    font-size: clamp(0.95rem, 1.3vw, 1.08rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Feature Grid – Animated Cards ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    backdrop-filter: blur(20px) saturate(160%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.feature-card::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-card-hover);
}

.feature-card:hover::after {
    transform: scaleX(1);
}

.feature-icon {
    width: 54px;
    height: 54px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    margin-bottom: var(--space-md);
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== Grid Utilities ===== */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* ===== Tabs ===== */
.tabs {
    display: flex;
    gap: 4px;
    background: rgba(99, 102, 241, 0.04);
    padding: 5px;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
}

.tab {
    flex: 1;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    text-align: center;
    transition: all var(--transition-fast);
    border: none;
    background: none;
    font-family: var(--font-primary);
}

.tab:hover {
    color: var(--text-secondary);
    background: rgba(99, 102, 241, 0.04);
}

.tab.active {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 2px 10px rgba(99, 102, 241, 0.25);
}

/* ===== Exam Question ===== */
.question-nav {
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    gap: 6px;
}

.question-nav-item {
    width: 100%;
    aspect-ratio: 1;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
    background: none;
    font-family: var(--font-primary);
}

.question-nav-item:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
    background: rgba(99, 102, 241, 0.04);
}

.question-nav-item.answered {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.25);
    color: var(--accent-success);
}

.question-nav-item.flagged {
    background: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.25);
    color: var(--accent-warning);
}

.question-nav-item.current {
    background: var(--gradient-primary);
    border-color: var(--accent-primary);
    color: white;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.25);
}

.answer-option {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 16px 20px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: 12px;
}

.answer-option:hover {
    border-color: var(--border-hover);
    background: rgba(99, 102, 241, 0.03);
}

.answer-option.selected {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.06);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.08);
}

.answer-option .option-letter {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    border: 2px solid var(--border-color);
    color: var(--text-muted);
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.answer-option.selected .option-letter {
    background: var(--gradient-primary);
    border-color: var(--accent-primary);
    color: white;
}

.answer-option .option-text {
    font-size: 15px;
    color: var(--text-secondary);
    padding-top: 4px;
}

/* ===== Timer ===== */
.timer {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    background: rgba(239, 68, 68, 0.06);
    border: 1px solid rgba(239, 68, 68, 0.15);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--accent-danger);
}

/* ===== Footer – 2026 ===== */
.footer {
    background: linear-gradient(180deg, var(--bg-primary) 0%, rgba(99, 102, 241, 0.04) 100%);
    border-top: 1px solid var(--border-color);
    padding: 56px 0 28px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand h3 {
    font-size: 1.3rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
}

.footer-brand p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.7;
}

.footer-col h4 {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 18px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul a {
    font-size: 14px;
    color: var(--text-muted);
    transition: all var(--transition-fast);
}

.footer-col ul a:hover {
    color: var(--accent-primary);
    padding-left: 4px;
}

.footer-bottom {
    text-align: center;
    padding-top: 28px;
    border-top: 1px solid var(--border-color);
    font-size: 13px;
    color: var(--text-dim);
}

/* ===== Animations ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.animate-fadeInUp {
    animation: fadeInUp 0.7s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    opacity: 0;
}

.animate-fadeIn {
    animation: fadeIn 0.5s ease forwards;
}

.animate-delay-1 { animation-delay: 0.12s; }
.animate-delay-2 { animation-delay: 0.24s; }
.animate-delay-3 { animation-delay: 0.36s; }
.animate-delay-4 { animation-delay: 0.48s; }

/* ===== Scroll-Driven Reveal ===== */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Utilities ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-accent { color: var(--accent-primary); }
.text-success { color: var(--accent-success); }
.text-warning { color: var(--accent-warning); }
.text-danger { color: var(--accent-danger); }

.fw-500 { font-weight: 500; }
.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }
.fw-800 { font-weight: 800; }

.fs-sm { font-size: 13px; }
.fs-base { font-size: 14px; }
.fs-lg { font-size: 16px; }
.fs-xl { font-size: 20px; }
.fs-2xl { font-size: 24px; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }

.w-full { width: 100%; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .sidebar { display: none; }
    .main-content { margin-left: 0; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .container { padding: 0 16px; }
    .hero h1 { font-size: 2.2rem; }
    .hero-stats { gap: 24px; }
    .section-title { font-size: 1.6rem; }
    .features-grid { grid-template-columns: 1fr; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .navbar-nav { display: none; }
    .btn-lg { padding: 12px 24px; font-size: 14px; }
    .question-nav { grid-template-columns: repeat(5, 1fr); }
    .orb { display: none; }
}