/* SRTN Landing Page - Light Theme */

/* ========================================
   CSS Variables
   ======================================== */
:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #6366f1;
    --secondary: #0ea5e9;
    --accent: #8b5cf6;

    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-card: #ffffff;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --text-light: #94a3b8;

    --border-color: #e2e8f0;
    --border-light: #f1f5f9;

    --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);

    --gradient-primary: linear-gradient(135deg, #4f46e5, #8b5cf6);
    --gradient-secondary: linear-gradient(135deg, #0ea5e9, #06b6d4);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ========================================
   Base Styles
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
}

ul {
    list-style: none;
}

/* ========================================
   Navigation
   ======================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

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

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
}

.nav-brand .brand-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

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

.nav-mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

.btn-white {
    background: white;
    color: var(--primary);
    border: none;
}

.btn-white:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-lg {
    padding: 16px 32px;
    font-size: 1.05rem;
}

.btn-primary-full,
.btn-outline-full {
    width: 100%;
    padding: 14px;
}

/* ========================================
   Mobile Menu
   ======================================== */
.mobile-menu {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: white;
    border-bottom: 1px solid var(--border-color);
    padding: 24px;
    flex-direction: column;
    gap: 16px;
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

.mobile-menu.active {
    display: flex;
}

.mobile-link {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    padding: 12px 0;
    border-bottom: 1px solid var(--border-light);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    padding: 160px 24px 100px;
    background: var(--bg-secondary);
    overflow: hidden;
}

.hero-bg-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 40% 80%, rgba(14, 165, 233, 0.06) 0%, transparent 40%);
    z-index: 0;
}

.hero-container {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 16px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.badge-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--gradient-primary);
    border-radius: 50%;
    color: white;
    font-size: 0.75rem;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.15;
    color: var(--text-primary);
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

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

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.7;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    padding: 32px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    max-width: 800px;
    margin: 0 auto;
}

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

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-top: 4px;
}

.stat-divider {
    width: 1px;
    height: 50px;
    background: var(--border-color);
}

/* ========================================
   Trust Badges
   ======================================== */
.trust-badges {
    padding: 40px 24px;
    background: white;
    border-bottom: 1px solid var(--border-color);
}

.trust-container {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

.trust-container > p {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 24px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.trust-logos {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.trust-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 1rem;
}

.trust-logo i {
    font-size: 1.5rem;
    color: var(--primary);
}

/* ========================================
   Section Styles
   ======================================== */
.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 24px;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    padding: 6px 14px;
    background: var(--bg-tertiary);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.section-title {
    font-size: 2.75rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   Features Grid
   ======================================== */
.features {
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.feature-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.4rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
}

.feature-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.feature-tags span {
    padding: 4px 10px;
    background: var(--bg-tertiary);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
}

/* ========================================
   14 Layers Section
   ======================================== */
.layers-section {
    background: white;
}

.layers-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
}

.layer-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 18px;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.layer-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.layer-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.layer-card:hover::before {
    opacity: 1;
}

.layer-number {
    position: absolute;
    top: 12px;
    right: 12px;
    font-size: 0.75rem;
    font-weight: 800;
    color: var(--text-light);
}

.layer-icon {
    width: 48px;
    height: 48px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    color: var(--primary);
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

.layer-card:hover .layer-icon {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.layer-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.layer-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ========================================
   How It Works
   ======================================== */
.how-it-works {
    background: var(--bg-secondary);
}

.steps-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 800px;
    margin: 0 auto;
}

.step-item {
    display: flex;
    align-items: flex-start;
    gap: 24px;
    padding: 24px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 100%;
    transition: all 0.3s ease;
}

.step-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.step-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.4rem;
    font-weight: 700;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step-content h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.step-content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.step-content code {
    background: var(--bg-tertiary);
    padding: 4px 8px;
    border-radius: 4px;
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 0.85rem;
    color: var(--primary);
}

.step-connector {
    width: 2px;
    height: 32px;
    background: linear-gradient(to bottom, var(--primary-light), var(--accent));
    margin-left: 27px;
}

/* ========================================
   Dashboard Preview
   ======================================== */
.dashboard-preview {
    background: white;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

.dashboard-feature {
    padding: 28px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
}

.dashboard-feature:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.dash-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    margin-bottom: 16px;
}

.dashboard-feature h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.dashboard-feature p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.dashboard-cta {
    text-align: center;
}

/* ========================================
   Pricing Section
   ======================================== */
.pricing {
    background: var(--bg-secondary);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    align-items: start;
}

.pricing-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 32px;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.pricing-card.popular {
    border-color: var(--primary);
    transform: scale(1.05);
    box-shadow: var(--shadow-xl);
}

.pricing-card.popular:hover {
    transform: scale(1.05) translateY(-4px);
}

.popular-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    color: white;
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
}

.pricing-header h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
    margin-bottom: 8px;
}

.currency {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.amount {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1;
}

.period {
    font-size: 1rem;
    color: var(--text-muted);
}

.pricing-header p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.pricing-features {
    text-align: left;
    margin-bottom: 32px;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    font-size: 0.95rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-light);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-features i {
    width: 20px;
    text-align: center;
}

.pricing-features i.fa-check {
    color: #10b981;
}

.pricing-features i.fa-times {
    color: var(--text-light);
}

.pricing-features i.fa-times.disabled {
    opacity: 0.4;
}

/* ========================================
   CTA Section
   ======================================== */
.cta {
    background: var(--gradient-primary);
    padding: 80px 24px;
}

.cta-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 800;
    color: white;
    margin-bottom: 16px;
}

.cta-content p {
    font-size: 1.15rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 32px;
}

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

.cta-note {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 60px 24px 24px;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-main {
    display: flex;
    justify-content: space-between;
    gap: 60px;
    margin-bottom: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 800;
    color: white;
    margin-bottom: 16px;
}

.footer-logo .brand-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.footer-brand p {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

.footer-links {
    display: flex;
    gap: 80px;
}

.footer-column h4 {
    font-size: 0.9rem;
    font-weight: 700;
    color: white;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-column a {
    display: block;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
    padding: 6px 0;
    transition: color 0.2s ease;
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-bottom p {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-social {
    display: flex;
    gap: 16px;
}

.footer-social a {
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all 0.2s ease;
}

.footer-social a:hover {
    background: var(--primary);
    transform: translateY(-2px);
}

/* ========================================
   Animations
   ======================================== */
.animate-in {
    animation: fadeInUp 0.6s ease forwards;
}

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

.feature-card,
.layer-card,
.step-item,
.dashboard-feature,
.pricing-card {
    opacity: 0;
}

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

    .layers-grid {
        grid-template-columns: repeat(4, 1fr);
    }

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

    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }

    .pricing-card.popular {
        transform: none;
    }

    .pricing-card.popular:hover {
        transform: translateY(-4px);
    }

    .footer-main {
        flex-direction: column;
        gap: 40px;
    }

    .footer-links {
        flex-wrap: wrap;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-mobile-toggle {
        display: block;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }

    .stat-divider {
        width: 50px;
        height: 1px;
    }

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

    .layers-grid {
        grid-template-columns: repeat(3, 1fr);
    }

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

    .step-item {
        flex-direction: column;
        text-align: center;
    }

    .step-connector {
        display: none;
    }

    .section-title {
        font-size: 2rem;
    }

    .cta-content h2 {
        font-size: 2rem;
    }

    .footer-links {
        flex-direction: column;
        gap: 32px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 140px 16px 80px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

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

    .trust-logos {
        gap: 24px;
    }

    .trust-logo {
        flex-direction: column;
        gap: 8px;
    }
}