/* ========================================
   LearnTAV Modern Design System
   A clean, professional CSS framework
   ======================================== */

/* CSS Variables */
:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #3b82f6;

    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    --color-gray-950: #030712;

    --color-white: #ffffff;
    --color-black: #000000;

    /* Accent Colors */
    --color-blue: #2563eb;
    --color-green: #10b981;
    --color-purple: #8b5cf6;
    --color-orange: #f59e0b;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    --transition-slow: 300ms ease;

    /* Container */
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

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

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-gray-700);
    background-color: var(--color-white);
}

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

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul, ol {
    list-style: none;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ========================================
   Navigation
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-gray-200);
    transition: var(--transition-normal);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-sm);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-gray-900);
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-600);
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-gray-900);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-gray-700);
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background: transparent;
    color: var(--color-gray-700);
    border: 1px solid var(--color-gray-300);
}

.btn-outline:hover {
    background: var(--color-gray-50);
    border-color: var(--color-gray-400);
}

.btn-ghost {
    background: transparent;
    color: var(--color-gray-600);
}

.btn-ghost:hover {
    background: var(--color-gray-100);
    color: var(--color-gray-900);
}

.btn-white {
    background: var(--color-white);
    color: var(--color-gray-900);
}

.btn-white:hover {
    background: var(--color-gray-100);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-base);
}

.btn svg {
    width: 18px;
    height: 18px;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    padding: calc(72px + var(--space-20)) 0 var(--space-20);
    min-height: 90vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hero-gradient {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 1400px;
    height: 600px;
    background: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(37, 99, 235, 0.15), transparent);
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(to right, var(--color-gray-200) 1px, transparent 1px),
        linear-gradient(to bottom, var(--color-gray-200) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: linear-gradient(to bottom, white, transparent);
    -webkit-mask-image: linear-gradient(to bottom, white, transparent);
    opacity: 0.5;
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--color-gray-100);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-700);
    margin-bottom: var(--space-6);
    animation: fadeInUp 0.6s ease forwards;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-green);
    border-radius: var(--radius-full);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, var(--font-size-6xl));
    font-weight: 700;
    line-height: 1.1;
    color: var(--color-gray-900);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-6);
    animation: fadeInUp 0.6s ease 0.1s forwards;
    opacity: 0;
}

.hero-title-gradient {
    display: block;
    background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--color-gray-600);
    max-width: 600px;
    margin: 0 auto var(--space-8);
    animation: fadeInUp 0.6s ease 0.2s forwards;
    opacity: 0;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    margin-bottom: var(--space-12);
    animation: fadeInUp 0.6s ease 0.3s forwards;
    opacity: 0;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-10);
    animation: fadeInUp 0.6s ease 0.4s forwards;
    opacity: 0;
}

.stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-gray-900);
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   Trusted Section
   ======================================== */
.trusted {
    padding: var(--space-12) 0;
    border-bottom: 1px solid var(--color-gray-200);
}

.trusted-label {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
    margin-bottom: var(--space-6);
}

.trusted-logos {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-10);
    flex-wrap: wrap;
}

.trusted-logo {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-gray-400);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ========================================
   Section Styles
   ======================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.section-tag {
    display: inline-block;
    padding: var(--space-1) var(--space-3);
    background: var(--color-primary);
    background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
    color: var(--color-white);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-4);
}

.section-title {
    font-size: clamp(1.875rem, 4vw, var(--font-size-4xl));
    font-weight: 700;
    color: var(--color-gray-900);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-4);
}

.section-description {
    font-size: var(--font-size-lg);
    color: var(--color-gray-600);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   Page Header (Inner Pages)
   ======================================== */
.page-header {
    padding: calc(72px + var(--space-16)) 0 var(--space-16);
    background: var(--color-gray-50);
    border-bottom: 1px solid var(--color-gray-200);
}

.page-header-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.page-title {
    font-size: clamp(2rem, 5vw, var(--font-size-5xl));
    font-weight: 700;
    color: var(--color-gray-900);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-4);
}

.page-description {
    font-size: var(--font-size-lg);
    color: var(--color-gray-600);
}

/* Programs section (used on inner pages) */
.programs {
    padding: var(--space-20) 0;
}

/* Active nav link */
.nav-link-active {
    color: var(--color-gray-900);
}

/* ========================================
   Services Section
   ======================================== */
.services {
    padding: var(--space-24) 0;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
}

.service-card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    transition: all var(--transition-normal);
}

.service-card:hover {
    border-color: var(--color-gray-300);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.service-card-featured {
    background: linear-gradient(135deg, var(--color-gray-900), var(--color-gray-800));
    border-color: var(--color-gray-800);
}

.service-card-featured:hover {
    border-color: var(--color-gray-700);
}

.service-card-featured .service-tag,
.service-card-featured .service-title,
.service-card-featured .service-description,
.service-card-featured .service-features li,
.service-card-featured .service-link {
    color: var(--color-white);
}

.service-card-featured .service-tag {
    color: var(--color-gray-400);
}

.service-card-featured .service-description,
.service-card-featured .service-features li {
    color: var(--color-gray-300);
}

.service-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
}

.service-icon-blue {
    background: rgba(37, 99, 235, 0.1);
    color: var(--color-blue);
}

.service-icon-green {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-green);
}

.service-icon-purple {
    background: rgba(139, 92, 246, 0.1);
    color: var(--color-purple);
}

.service-icon-orange {
    background: rgba(245, 158, 11, 0.1);
    color: var(--color-orange);
}

.service-card-featured .service-icon-blue {
    background: rgba(37, 99, 235, 0.2);
    color: var(--color-primary-light);
}

.service-tag {
    display: block;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray-500);
    margin-bottom: var(--space-2);
}

.service-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--space-3);
}

.service-description {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    margin-bottom: var(--space-4);
}

.service-features {
    margin-bottom: var(--space-6);
}

.service-features li {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    padding: var(--space-1) 0;
}

.service-features li::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--color-primary);
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.service-card-featured .service-features li::before {
    background: var(--color-primary-light);
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-primary);
    transition: gap var(--transition-fast);
}

.service-link:hover {
    gap: var(--space-3);
}

.service-card-featured .service-link {
    color: var(--color-primary-light);
}

/* ========================================
   Features Section
   ======================================== */
.features {
    padding: var(--space-24) 0;
    background: var(--color-gray-50);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-8);
}

.feature {
    text-align: center;
}

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-xl);
    margin: 0 auto var(--space-4);
    color: var(--color-primary);
}

.feature-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--space-2);
}

.feature-description {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

/* ========================================
   Testimonials Section
   ======================================== */
.testimonials {
    padding: var(--space-24) 0;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.testimonial {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    transition: all var(--transition-normal);
}

.testimonial:hover {
    border-color: var(--color-gray-300);
    box-shadow: var(--shadow-md);
}

.testimonial-content {
    margin-bottom: var(--space-6);
}

.testimonial-quote {
    font-size: var(--font-size-base);
    color: var(--color-gray-700);
    line-height: 1.7;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.author-avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
    color: var(--color-white);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-full);
}

.author-info {
    display: flex;
    flex-direction: column;
}

.author-name {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-gray-900);
}

.author-title {
    font-size: var(--font-size-xs);
    color: var(--color-gray-500);
}

.testimonial-metric {
    display: inline-block;
    padding: var(--space-1) var(--space-3);
    background: var(--color-gray-100);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-gray-700);
}

/* ========================================
   CTA Section
   ======================================== */
.cta {
    padding: var(--space-24) 0;
    background: linear-gradient(135deg, var(--color-gray-900), var(--color-gray-800));
}

.cta-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta-title {
    font-size: clamp(1.5rem, 3vw, var(--font-size-3xl));
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-4);
}

.cta-description {
    font-size: var(--font-size-lg);
    color: var(--color-gray-400);
    margin-bottom: var(--space-8);
}

.cta-actions {
    margin-bottom: var(--space-6);
}

.cta-email {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

.cta-email a {
    color: var(--color-gray-300);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.cta-email a:hover {
    color: var(--color-white);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: var(--space-16) 0 var(--space-8);
    background: var(--color-gray-950);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-16);
    margin-bottom: var(--space-12);
}

.footer-logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-white);
}

.footer-tagline {
    font-size: var(--font-size-sm);
    color: var(--color-gray-400);
    margin-top: var(--space-4);
    max-width: 280px;
}

.footer-motto {
    font-size: var(--font-size-sm);
    font-style: italic;
    color: var(--color-gray-500);
    margin-top: var(--space-2);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.footer-column h4 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--space-4);
}

.footer-column a {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-gray-400);
    padding: var(--space-1) 0;
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--color-white);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-gray-800);
}

.footer-bottom p {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

.footer-legal {
    display: flex;
    gap: var(--space-6);
}

.footer-legal a {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
    transition: color var(--transition-fast);
}

.footer-legal a:hover {
    color: var(--color-white);
}

/* ========================================
   Mobile Menu
   ======================================== */
.mobile-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-white);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.mobile-menu.active {
    opacity: 1;
    visibility: visible;
}

.mobile-menu-content {
    display: flex;
    flex-direction: column;
    padding: var(--space-6);
}

.mobile-link {
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--color-gray-700);
    padding: var(--space-4) 0;
    border-bottom: 1px solid var(--color-gray-200);
}

.mobile-cta {
    margin-top: var(--space-6);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-10);
    }
}

@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
    }

    .nav-menu {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .btn-ghost {
        display: none;
    }

    .hero {
        min-height: auto;
        padding: calc(72px + var(--space-12)) 0 var(--space-12);
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--space-6);
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }

    .testimonials-grid {
        grid-template-columns: 1fr;
    }

    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .trusted-logos {
        gap: var(--space-6);
    }

    .footer-links {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Scroll Animations
   ======================================== */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered animations */
.services-grid .service-card:nth-child(1) { transition-delay: 0s; }
.services-grid .service-card:nth-child(2) { transition-delay: 0.1s; }
.services-grid .service-card:nth-child(3) { transition-delay: 0.2s; }
.services-grid .service-card:nth-child(4) { transition-delay: 0.3s; }

.features-grid .feature:nth-child(1) { transition-delay: 0s; }
.features-grid .feature:nth-child(2) { transition-delay: 0.1s; }
.features-grid .feature:nth-child(3) { transition-delay: 0.2s; }
.features-grid .feature:nth-child(4) { transition-delay: 0.3s; }

.testimonials-grid .testimonial:nth-child(1) { transition-delay: 0s; }
.testimonials-grid .testimonial:nth-child(2) { transition-delay: 0.1s; }
.testimonials-grid .testimonial:nth-child(3) { transition-delay: 0.2s; }

/* ========================================
   Theme Toggle
   ======================================== */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-gray-100);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--color-gray-600);
}

.theme-toggle:hover {
    background: var(--color-gray-200);
    color: var(--color-gray-900);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

.theme-toggle .sun-icon {
    display: none;
}

.theme-toggle .moon-icon {
    display: block;
}

/* ========================================
   Dark Mode
   ======================================== */
[data-theme="dark"] {
    --color-gray-50: #1a1a2e;
    --color-gray-100: #16213e;
    --color-gray-200: #1f2937;
    --color-gray-300: #374151;
    --color-gray-400: #6b7280;
    --color-gray-500: #9ca3af;
    --color-gray-600: #d1d5db;
    --color-gray-700: #e5e7eb;
    --color-gray-800: #f3f4f6;
    --color-gray-900: #f9fafb;
    --color-gray-950: #ffffff;

    --color-white: #0f0f23;
    --color-black: #ffffff;
}

[data-theme="dark"] body {
    background-color: #0f0f23;
    color: var(--color-gray-700);
}

[data-theme="dark"] .header {
    background: rgba(15, 15, 35, 0.9);
    border-bottom-color: var(--color-gray-200);
}

[data-theme="dark"] .header.scrolled {
    background: rgba(15, 15, 35, 0.98);
}

[data-theme="dark"] .logo-text {
    color: var(--color-gray-900);
}

[data-theme="dark"] .nav-link {
    color: var(--color-gray-500);
}

[data-theme="dark"] .nav-link:hover,
[data-theme="dark"] .nav-link-active {
    color: var(--color-gray-900);
}

[data-theme="dark"] .nav-toggle span {
    background: var(--color-gray-700);
}

[data-theme="dark"] .btn-primary {
    background: var(--color-primary);
    color: #fff;
}

[data-theme="dark"] .btn-ghost {
    color: var(--color-gray-500);
}

[data-theme="dark"] .btn-ghost:hover {
    background: var(--color-gray-100);
    color: var(--color-gray-900);
}

[data-theme="dark"] .btn-outline {
    border-color: var(--color-gray-300);
    color: var(--color-gray-700);
}

[data-theme="dark"] .btn-outline:hover {
    background: var(--color-gray-100);
    border-color: var(--color-gray-400);
}

[data-theme="dark"] .hero {
    background-color: #0f0f23;
}

[data-theme="dark"] .hero-badge {
    background: var(--color-gray-100);
    border-color: var(--color-gray-200);
    color: var(--color-gray-700);
}

[data-theme="dark"] .hero-title {
    color: var(--color-gray-900);
}

[data-theme="dark"] .hero-description {
    color: var(--color-gray-500);
}

[data-theme="dark"] .hero-grid {
    background-image:
        linear-gradient(to right, var(--color-gray-200) 1px, transparent 1px),
        linear-gradient(to bottom, var(--color-gray-200) 1px, transparent 1px);
    opacity: 0.3;
}

[data-theme="dark"] .stat-value {
    color: var(--color-gray-900);
}

[data-theme="dark"] .stat-label {
    color: var(--color-gray-500);
}

[data-theme="dark"] .trusted {
    border-bottom-color: var(--color-gray-200);
}

[data-theme="dark"] .section-title {
    color: var(--color-gray-900);
}

[data-theme="dark"] .section-description {
    color: var(--color-gray-500);
}

[data-theme="dark"] .page-header {
    background: var(--color-gray-100);
    border-bottom-color: var(--color-gray-200);
}

[data-theme="dark"] .page-title {
    color: var(--color-gray-900);
}

[data-theme="dark"] .page-description {
    color: var(--color-gray-500);
}

[data-theme="dark"] .service-card {
    background: var(--color-gray-100);
    border-color: var(--color-gray-200);
}

[data-theme="dark"] .service-card:hover {
    border-color: var(--color-gray-300);
}

[data-theme="dark"] .service-tag {
    color: var(--color-gray-500);
}

[data-theme="dark"] .service-title {
    color: var(--color-gray-900);
}

[data-theme="dark"] .service-description {
    color: var(--color-gray-500);
}

[data-theme="dark"] .service-features li {
    color: var(--color-gray-500);
}

[data-theme="dark"] .features {
    background: var(--color-gray-100);
}

[data-theme="dark"] .feature-icon {
    background: var(--color-gray-50);
    border-color: var(--color-gray-200);
}

[data-theme="dark"] .feature-title {
    color: var(--color-gray-900);
}

[data-theme="dark"] .feature-description {
    color: var(--color-gray-500);
}

[data-theme="dark"] .testimonial {
    background: var(--color-gray-100);
    border-color: var(--color-gray-200);
}

[data-theme="dark"] .testimonial:hover {
    border-color: var(--color-gray-300);
}

[data-theme="dark"] .testimonial-quote {
    color: var(--color-gray-700);
}

[data-theme="dark"] .author-name {
    color: var(--color-gray-900);
}

[data-theme="dark"] .author-title {
    color: var(--color-gray-500);
}

[data-theme="dark"] .testimonial-metric {
    background: var(--color-gray-200);
    color: var(--color-gray-700);
}

[data-theme="dark"] .mobile-menu {
    background: #0f0f23;
}

[data-theme="dark"] .mobile-link {
    color: var(--color-gray-700);
    border-bottom-color: var(--color-gray-200);
}

[data-theme="dark"] .theme-toggle {
    background: var(--color-gray-100);
    border-color: var(--color-gray-200);
    color: var(--color-gray-500);
}

[data-theme="dark"] .theme-toggle:hover {
    background: var(--color-gray-200);
    color: var(--color-gray-900);
}

[data-theme="dark"] .theme-toggle .sun-icon {
    display: block;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: none;
}

/* Legal pages dark mode */
[data-theme="dark"] .legal-content p,
[data-theme="dark"] .legal-content li {
    color: var(--color-gray-500);
}

[data-theme="dark"] .legal-updated {
    background: var(--color-gray-100);
}

[data-theme="dark"] .contact-box {
    background: var(--color-gray-100);
}

[data-theme="dark"] .cookie-table {
    background: var(--color-gray-100);
}

[data-theme="dark"] .cookie-table td {
    border-bottom-color: var(--color-gray-200);
}

[data-theme="dark"] .important-notice {
    background: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.3);
}