/* ============================================
   Tri-Sea — Static Website Styles
   ============================================ */

:root {
    --primary: #0078CC;
    --primary-dark: #005FA3;
    --primary-light: #3399E0;
    --accent: #00B4D8;
    --gradient: linear-gradient(135deg, #0078CC 0%, #00B4D8 50%, #48CAE4 100%);
    --gradient-text: linear-gradient(135deg, #0078CC, #00B4D8, #48CAE4);
    --bg: #FAFBFE;
    --bg-card: #FFFFFF;
    --bg-dark: #0A1628;
    --bg-dark-card: #111D33;
    --text: #1A2332;
    --text-secondary: #5A6B80;
    --text-muted: #8A9AB0;
    --border: #E2E8F0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
    --shadow-glow: 0 0 40px rgba(0,120,204,0.15);
    --radius: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   Navigation
   ============================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(250, 251, 254, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 10px 0;
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--text);
}

.brand-icon { font-size: 1.5rem; }

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

.nav-links a {
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition);
}

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

.nav-cta {
    background: var(--primary) !important;
    color: white !important;
    padding: 8px 20px !important;
    border-radius: 100px;
    font-weight: 600 !important;
    transition: all var(--transition) !important;
}

.nav-cta:hover {
    background: var(--primary-dark) !important;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: rgba(250, 251, 254, 0.98);
    backdrop-filter: blur(20px);
    padding: 24px;
    flex-direction: column;
    gap: 16px;
    z-index: 999;
    border-bottom: 1px solid var(--border);
}

.mobile-menu a {
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 8px 0;
}

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

/* ============================================
   Hero
   ============================================ */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 120px 24px 80px;
    background: linear-gradient(180deg, #F0F6FF 0%, var(--bg) 100%);
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.wave {
    position: absolute;
    bottom: -2px;
    left: -5%;
    width: 110%;
    height: 200px;
    background: var(--bg);
    border-radius: 100% 100% 0 0;
}

.wave-1 {
    opacity: 0.3;
    animation: wave 8s ease-in-out infinite;
}

.wave-2 {
    opacity: 0.2;
    animation: wave 6s ease-in-out infinite reverse;
    bottom: -10px;
}

.wave-3 {
    opacity: 0.15;
    animation: wave 10s ease-in-out infinite;
    bottom: -20px;
}

@keyframes wave {
    0%, 100% { transform: translateX(0) scaleY(1); }
    50% { transform: translateX(-2%) scaleY(1.15); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary);
    color: white;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 100px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 24px;
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

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

.hero-subtitle {
    font-size: 1.15rem;
    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;
    margin-bottom: 60px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: inherit;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    border-radius: 100px;
    transition: all var(--transition);
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 16px rgba(0,120,204,0.3);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(0,120,204,0.4);
}

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

.btn-ghost:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 14px 32px;
    font-size: 1rem;
}

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

.stat { text-align: center; }

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* ============================================
   Section Common
   ============================================ */

section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    padding: 4px 14px;
    background: var(--primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 100px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   Features
   ============================================ */

.features {
    background: var(--bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.feature-card {
    position: relative;
    padding: 32px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    transition: all var(--transition);
    overflow: hidden;
}

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

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

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

.feature-card-large {
    grid-column: span 3;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 20px;
    background: linear-gradient(135deg, #F0F6FF, #E8F4FD);
    border: 1px solid rgba(0,120,204,0.15);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.feature-card-large .feature-icon {
    font-size: 2.5rem;
    margin-bottom: 0;
}

.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.feature-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--primary);
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
    border-radius: 100px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.feature-card-large .feature-tag {
    align-self: start;
}

/* ============================================
   Science
   ============================================ */

.science {
    background: var(--bg-dark);
    color: white;
}

.science .section-tag {
    background: rgba(0,180,216,0.2);
    color: var(--accent);
}

.science .section-header p {
    color: rgba(255,255,255,0.6);
}

.science-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.science-card {
    padding: 32px;
    background: var(--bg-dark-card);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255,255,255,0.08);
    transition: all var(--transition);
}

.science-card:hover {
    transform: translateY(-4px);
    border-color: rgba(0,180,216,0.3);
    box-shadow: 0 8px 32px rgba(0,180,216,0.1);
}

.science-number {
    font-size: 2.5rem;
    font-weight: 900;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
    line-height: 1;
}

.science-card h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.science-card p {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.6);
    line-height: 1.7;
}

/* ============================================
   Platforms
   ============================================ */

.platforms {
    background: var(--bg);
}

.platform-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

.platform-card {
    padding: 40px;
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    transition: all var(--transition);
}

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

.platform-icon {
    color: var(--primary);
    margin-bottom: 20px;
}

.platform-card h3 {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.platform-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.7;
}

.platform-features {
    list-style: none;
}

.platform-features li {
    padding: 6px 0;
    padding-left: 24px;
    position: relative;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.platform-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
}

.sync-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px 28px;
    background: linear-gradient(135deg, #F0F6FF, #E8F4FD);
    border: 1px solid rgba(0,120,204,0.15);
    border-radius: 100px;
    max-width: 600px;
    margin: 0 auto;
    color: var(--primary-dark);
    font-size: 0.9rem;
    font-weight: 500;
}

/* ============================================
   Download
   ============================================ */

.download {
    background: linear-gradient(180deg, var(--bg) 0%, #F0F6FF 100%);
    text-align: center;
}

.download-content h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: 16px;
}

.download-content > p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto 40px;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 60px;
}

.app-store-btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 14px 28px;
    background: var(--text);
    color: white;
    border-radius: var(--radius);
    text-decoration: none;
    transition: all var(--transition);
    position: relative;
}

.app-store-btn .small {
    display: block;
    font-size: 0.7rem;
    opacity: 0.8;
}

.app-store-btn .large {
    display: block;
    font-size: 1.15rem;
    font-weight: 700;
}

.coming-soon {
    cursor: default;
    opacity: 0.85;
}

.coming-soon-badge {
    position: absolute;
    top: -10px;
    right: -10px;
    background: var(--accent);
    color: white;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 100px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Pricing */

.pricing-preview {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.pricing-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    width: 280px;
    text-align: left;
    transition: all var(--transition);
    position: relative;
}

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

.pricing-card-premium {
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
}

.popular-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient);
    color: white;
    padding: 4px 16px;
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.pricing-card h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.pricing-card .price {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--primary);
    margin-bottom: 20px;
}

.pricing-card .price span {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-muted);
}

.pricing-card ul {
    list-style: none;
}

.pricing-card li {
    padding: 6px 0;
    padding-left: 24px;
    position: relative;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.pricing-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
}

/* ============================================
   Support Form
   ============================================ */

.support {
    background: var(--bg);
}

.support-form {
    max-width: 640px;
    margin: 0 auto;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 0.95rem;
    color: var(--text);
    background: var(--bg-card);
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0,120,204,0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.support-form .btn {
    width: 100%;
    justify-content: center;
    font-size: 1rem;
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background: var(--bg-dark);
    color: white;
    padding: 60px 0 32px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-brand .brand-icon { font-size: 2rem; }
.footer-brand .brand-text {
    font-size: 1.25rem;
    font-weight: 800;
}

.footer-brand p {
    color: rgba(255,255,255,0.5);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links h4 {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: rgba(255,255,255,0.4);
    margin-bottom: 4px;
}

.footer-links a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition);
}

.footer-links a:hover { color: var(--accent); }

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.35);
}

/* ============================================
   Animations
   ============================================ */

.animate-fade-up {
    opacity: 0;
    transform: translateY(24px);
    animation: fadeUp 0.7s ease forwards;
}

.delay-1 { animation-delay: 0.15s; }
.delay-2 { animation-delay: 0.3s; }
.delay-3 { animation-delay: 0.45s; }
.delay-4 { animation-delay: 0.6s; }

@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 900px) {
    .nav-links { display: none; }
    .nav-toggle { display: flex; }

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

    .feature-card-large {
        grid-column: span 1;
        grid-template-columns: 1fr;
    }

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

    .platform-cards {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }

    .hero-stats {
        gap: 24px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .pricing-preview {
        flex-direction: column;
        align-items: center;
    }

    .sync-badge {
        flex-direction: column;
        text-align: center;
        border-radius: var(--radius-lg);
    }
}

@media (max-width: 600px) {
    .hero {
        padding: 100px 16px 60px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 16px;
    }

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

    .pricing-card {
        width: 100%;
    }
}