/* ========================================
   GenZSocial - Premium Dating App Website
   Ultra-clean Gen-Z Aesthetic
   ======================================== */

/* CSS Variables - Premium Black & Gold Theme */
:root {
    --primary-gold: #D4AF37;
    --primary-gold-dark: #B8941F;
    --primary-gold-light: #E5C76B;
    --accent-gold: #F0D878;
    --bg-black: #0A0A0A;
    --bg-dark: #111111;
    --bg-charcoal: #1A1A1A;
    --bg-card: #141414;
    --text-primary: #FFFFFF;
    --text-secondary: #B0B0B0;
    --text-muted: #666666;
    --border-light: #2A2A2A;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* 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: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-black);
}

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

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

/* ========================================
   HEADER & NAVIGATION
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    transition: box-shadow var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.logo img {
    height: 36px;
    width: auto;
}

.nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 10px 16px;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--primary-gold);
    background-color: var(--bg-charcoal);
}

.nav-link.active {
    color: var(--primary-gold);
    background-color: rgba(212, 175, 55, 0.1);
}

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

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--primary-gold);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* ========================================
   HERO SECTION
   ======================================== */
.hero {
    padding: 140px 24px 100px;
    text-align: center;
    background: linear-gradient(180deg, var(--bg-black) 0%, var(--bg-dark) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 20%, rgba(212, 175, 55, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(240, 216, 120, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.hero-container {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(212, 175, 55, 0.1);
    border: 1px solid rgba(212, 175, 55, 0.3);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-gold);
    margin-bottom: 32px;
    animation: fadeInDown 0.6s ease;
}

.hero-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--primary-gold);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

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

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    color: var(--text-primary);
    margin-bottom: 24px;
    letter-spacing: -0.02em;
    animation: fadeInUp 0.6s ease 0.1s both;
}

.hero-title span {
    background: linear-gradient(135deg, var(--primary-gold) 0%, var(--primary-gold-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2.5vw, 1.375rem);
    line-height: 1.7;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-cta {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    animation: fadeInUp 0.6s ease 0.3s both;
}

.app-store-btn img {
    height: 56px;
    width: auto;
    transition: transform var(--transition-fast);
}

.app-store-btn:hover img {
    transform: scale(1.03);
}

.hero-trust {
    display: flex;
    align-items: center;
    gap: 24px;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.hero-trust-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.hero-trust-item::before {
    content: '✓';
    color: var(--primary-gold);
    font-weight: 700;
}

/* ========================================
   BUTTONS
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-gold) 0%, var(--primary-gold-dark) 100%);
    color: var(--bg-black);
    box-shadow: 0 4px 14px rgba(212, 175, 55, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(212, 175, 55, 0.5);
}

.btn-secondary {
    background: var(--bg-charcoal);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
}

.btn-secondary:hover {
    background: var(--bg-dark);
    border-color: var(--primary-gold);
    color: var(--primary-gold);
}

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

.btn-outline:hover {
    background: var(--primary-gold);
    color: var(--bg-black);
}

/* ========================================
   SECTIONS
   ======================================== */
.section {
    padding: 100px 24px;
}

.section-alt {
    background-color: var(--bg-dark);
}

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

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 64px;
}

.section-label {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(212, 175, 55, 0.1);
    color: var(--primary-gold);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 800;
    line-height: 1.2;
    color: var(--text-primary);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   PHILOSOPHY SECTION
   ======================================== */
.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.philosophy-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: all var(--transition-base);
}

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

.philosophy-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-gold) 0%, var(--primary-gold-dark) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 24px;
    color: var(--bg-black);
}

.philosophy-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.philosophy-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   FEATURES SECTION
   ======================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 24px;
}

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

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-gold) 0%, var(--accent-gold) 100%);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

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

.feature-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-gold);
}

.feature-card.expanded {
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-gold);
}

.feature-header {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: rgba(212, 175, 55, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.feature-title-group {
    flex: 1;
}

.feature-title-group h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.feature-title-group p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
}

.feature-expand-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-charcoal);
    border-radius: 50%;
    font-size: 1rem;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.feature-card:hover .feature-expand-icon {
    background: var(--primary-gold);
    color: var(--bg-black);
}

.feature-card.expanded .feature-expand-icon {
    transform: rotate(180deg);
    background: var(--primary-gold);
    color: var(--bg-black);
}

.feature-details {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-slow);
}

.feature-card.expanded .feature-details {
    max-height: 500px;
    padding-top: 24px;
}

.feature-details ul {
    list-style: none;
}

.feature-details li {
    padding: 8px 0;
    padding-left: 28px;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

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

/* ========================================
   HOW IT WORKS - STEPS
   ======================================== */
.steps-container {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: relative;
}

.steps-container::before {
    content: '';
    position: absolute;
    left: 28px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary-gold) 0%, var(--accent-gold) 100%);
}

.step {
    display: flex;
    gap: 32px;
    padding: 32px 0;
    position: relative;
}

.step-number {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-gold) 0%, var(--primary-gold-dark) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--bg-black);
    flex-shrink: 0;
    box-shadow: 0 4px 14px rgba(212, 175, 55, 0.4);
    position: relative;
    z-index: 1;
}

.step-content {
    flex: 1;
    padding-top: 8px;
}

.step-content h3 {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.step-content p {
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 560px;
}

/* ========================================
   META PAGE
   ======================================== */
.meta-notice {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 48px;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
}

.meta-notice-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-light);
}

.meta-notice-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, #1877F2 0%, #4267B2 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
}

.meta-notice-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.meta-notice-header p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.meta-list {
    list-style: none;
    margin-bottom: 32px;
}

.meta-list li {
    padding: 16px 0;
    padding-left: 40px;
    position: relative;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-secondary);
}

.meta-list li:last-child {
    border-bottom: none;
}

.meta-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-gold);
    font-weight: 700;
    font-size: 1.25rem;
}

.meta-disclaimer {
    background: var(--bg-charcoal);
    border-radius: var(--radius-md);
    padding: 24px 32px;
    border-left: 4px solid var(--primary-gold);
}

.meta-disclaimer h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.meta-disclaimer ul {
    list-style: none;
}

.meta-disclaimer li {
    padding: 8px 0;
    padding-left: 28px;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.meta-disclaimer li::before {
    content: '✕';
    position: absolute;
    left: 0;
    color: #EF4444;
    font-weight: 700;
}

/* ========================================
   ABOUT PAGE
   ======================================== */
.about-hero {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 80px;
}

.about-hero h2 {
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 700;
    line-height: 1.4;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.about-hero p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.value-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--border-light);
    text-align: center;
    transition: all var(--transition-base);
}

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

.value-icon {
    width: 64px;
    height: 64px;
    background: rgba(212, 175, 55, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin: 0 auto 20px;
}

.value-card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.value-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* ========================================
   CONTACT PAGE
   ======================================== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    max-width: 800px;
    margin: 0 auto;
}

.contact-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    border: 1px solid var(--border-light);
    text-align: center;
    transition: all var(--transition-base);
}

.contact-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-gold);
}

.contact-icon {
    width: 72px;
    height: 72px;
    background: linear-gradient(135deg, var(--primary-gold) 0%, var(--primary-gold-dark) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 24px;
    color: var(--bg-black);
}

.contact-card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.contact-card p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.contact-card a {
    color: var(--primary-gold);
    font-weight: 600;
    transition: color var(--transition-fast);
}

.contact-card a:hover {
    color: var(--primary-gold-light);
}

.contact-location {
    text-align: center;
    margin-top: 64px;
    padding-top: 48px;
    border-top: 1px solid var(--border-light);
}

.contact-location h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.contact-location p {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* ========================================
   FOOTER
   ======================================== */
.footer {
    background: var(--bg-dark);
    border-top: 1px solid var(--border-light);
    padding: 64px 24px 32px;
}

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

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand {
    max-width: 280px;
}

.footer-brand img {
    height: 40px;
    margin-bottom: 16px;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.7;
}

.footer-column h4 {
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 32px;
    border-top: 1px solid var(--border-light);
}

.footer-copyright {
    color: var(--text-muted);
    font-size: 0.875rem;
}

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

.footer-social a {
    width: 40px;
    height: 40px;
    background: var(--bg-charcoal);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 1.125rem;
    transition: all var(--transition-fast);
    border: 1px solid var(--border-light);
}

.footer-social a:hover {
    background: var(--primary-gold);
    color: var(--bg-black);
    border-color: var(--primary-gold);
}

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

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

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

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

@media (max-width: 768px) {
    .header-container {
        height: 64px;
    }

    .nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--bg-black);
        flex-direction: column;
        padding: 16px 24px;
        border-bottom: 1px solid var(--border-light);
        box-shadow: var(--shadow-lg);
    }

    .nav.active {
        display: flex;
    }

    .nav-link {
        width: 100%;
        text-align: left;
        padding: 12px 16px;
    }

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

    .hero {
        padding: 120px 20px 80px;
    }

    .section {
        padding: 80px 20px;
    }

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

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

    .steps-container::before {
        left: 24px;
    }

    .step {
        gap: 20px;
    }

    .step-number {
        width: 48px;
        height: 48px;
        font-size: 1.25rem;
    }

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

    .footer-bottom {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }

    .meta-notice {
        padding: 32px 24px;
    }

    .hero-trust {
        flex-direction: column;
        gap: 12px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .btn {
        width: 100%;
    }
}

/* ========================================
   ACCESSIBILITY
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Focus styles */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--primary-gold);
    outline-offset: 2px;
}

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}