/* ============================================
   INTVL Website — Dark Theme
   Matches iOS app design system
   ============================================ */

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

:root {
    --bg-primary: #000000;
    --bg-elevated: #1C1C1E;
    --bg-secondary: #2C2C2E;
    --bg-tertiary: #3A3A3C;
    --text-primary: #F5F5F7;
    --text-secondary: #A1A1A6;
    --text-tertiary: #636366;
    --accent: #32D74B;
    --accent-hover: #2BBF42;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-pill: 999px;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

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

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
}

.nav-brand img {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
}

.nav-brand span {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 2px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

.nav-hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 8px;
}

.nav-hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

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

.nav-hamburger.open span:nth-child(2) {
    opacity: 0;
}

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

/* Mobile nav */
@media (max-width: 768px) {
    .nav-hamburger {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(0, 0, 0, 0.95);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        gap: 0;
        padding: 8px 0;
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all 0.3s ease;
        border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links a {
        display: block;
        padding: 14px 24px;
        font-size: 17px;
    }
}

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

/* --- Hero Section --- */
.hero {
    padding-top: 140px;
    padding-bottom: 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(50, 215, 75, 0.12) 0%, transparent 70%);
    pointer-events: none;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(50, 215, 75, 0.1);
    border: 1px solid rgba(50, 215, 75, 0.25);
    border-radius: var(--radius-pill);
    color: var(--accent);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin-bottom: 24px;
}

.hero h1 {
    font-size: clamp(40px, 8vw, 72px);
    font-weight: 800;
    line-height: 1.05;
    margin-bottom: 20px;
    letter-spacing: -1.5px;
}

.hero h1 .accent {
    color: var(--accent);
}

.hero-subtitle {
    font-size: clamp(16px, 2.5vw, 20px);
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto 40px;
    line-height: 1.5;
}

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

.app-store-badge {
    height: 54px;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.app-store-badge:hover {
    transform: scale(1.05);
    opacity: 0.9;
}

.hero-image {
    position: relative;
    max-width: 300px;
    margin: 0 auto;
}

.hero-image img {
    border-radius: 32px;
    box-shadow: 0 40px 80px rgba(0, 0, 0, 0.6), 0 0 120px rgba(50, 215, 75, 0.08);
}

/* --- Section Styles --- */
.section {
    padding: 100px 0;
}

.section-label {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(28px, 5vw, 44px);
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-subtitle {
    font-size: 17px;
    color: var(--text-secondary);
    max-width: 560px;
    line-height: 1.5;
}

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

.section-header .section-subtitle {
    margin: 0 auto;
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.feature-card {
    background: var(--bg-elevated);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-xl);
    padding: 36px 28px;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(50, 215, 75, 0.2);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: rgba(50, 215, 75, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 22px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.5;
}

@media (max-width: 768px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* --- Screenshots Section --- */
.screenshots {
    background: var(--bg-elevated);
    overflow: hidden;
}

.screenshots-scroll {
    display: flex;
    gap: 24px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding: 0 24px 24px;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.screenshots-scroll::-webkit-scrollbar {
    display: none;
}

.screenshot-item {
    flex: 0 0 auto;
    scroll-snap-align: center;
    width: 240px;
}

.screenshot-item img {
    width: 100%;
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    transition: transform 0.3s ease;
}

.screenshot-item:hover img {
    transform: scale(1.03);
}

@media (min-width: 769px) {
    .screenshots-scroll {
        justify-content: center;
        overflow-x: visible;
        flex-wrap: wrap;
        padding: 0;
    }

    .screenshot-item {
        width: 200px;
    }
}

/* --- Download CTA Section --- */
.cta-section {
    text-align: center;
    padding: 120px 0;
    position: relative;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 400px;
    background: radial-gradient(ellipse, rgba(50, 215, 75, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.cta-section h2 {
    font-size: clamp(32px, 6vw, 52px);
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -1px;
}

.cta-section p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

/* --- Footer --- */
.footer {
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding: 48px 0;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
    text-decoration: none;
}

.footer-brand img {
    width: 28px;
    height: 28px;
    border-radius: 6px;
}

.footer-brand span {
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 1.5px;
}

.footer-links {
    display: flex;
    gap: 24px;
    list-style: none;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-tertiary);
    font-size: 14px;
    transition: color 0.2s ease;
}

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

.footer-copy {
    width: 100%;
    text-align: center;
    padding-top: 32px;
    margin-top: 8px;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    color: var(--text-tertiary);
    font-size: 13px;
}

/* --- Legal Pages --- */
.legal-page {
    padding-top: 104px;
    padding-bottom: 80px;
}

.legal-content {
    max-width: 720px;
    margin: 0 auto;
}

.legal-content h1 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 8px;
}

.legal-content .legal-date {
    color: var(--text-tertiary);
    font-size: 14px;
    margin-bottom: 48px;
}

.legal-content h2 {
    font-size: 22px;
    font-weight: 600;
    margin-top: 48px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.legal-content h3 {
    font-size: 18px;
    font-weight: 600;
    margin-top: 32px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.legal-content p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 16px;
}

.legal-content ul,
.legal-content ol {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 16px;
    padding-left: 24px;
}

.legal-content li {
    margin-bottom: 8px;
}

.legal-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.legal-content a {
    color: var(--accent);
}

.legal-content .contact-block {
    background: var(--bg-elevated);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-md);
    padding: 24px;
    margin: 24px 0;
}

.legal-content .contact-block p {
    margin-bottom: 4px;
}

/* --- Animations --- */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Utilities --- */
.text-center { text-align: center; }

@media (max-width: 768px) {
    .section {
        padding: 64px 0;
    }

    .hero {
        padding-top: 110px;
        padding-bottom: 60px;
    }

    .cta-section {
        padding: 80px 0;
    }

    .footer-inner {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }
}