/* ============================================
   3S VPN - Cyber-Luxe Security Theme
   ============================================ */

:root {
    /* Core Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;

    /* Accent Colors */
    --cyan: #00f0ff;
    --purple: #8b5cf6;
    --cyan-glow: rgba(0, 240, 255, 0.15);
    --purple-glow: rgba(139, 92, 246, 0.15);

    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--cyan) 0%, var(--purple) 100%);
    --gradient-bg: radial-gradient(ellipse at top, var(--bg-secondary) 0%, var(--bg-primary) 70%);

    /* Spacing */
    --nav-height: 80px;
    --section-padding: clamp(80px, 10vw, 140px);
    --container-max: 1280px;

    /* Typography */
    --font-primary: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Effects */
    --border-subtle: 1px solid rgba(255, 255, 255, 0.08);
    --shadow-glow: 0 0 60px rgba(0, 240, 255, 0.1);
}

/* ============================================
   Reset & Base
   ============================================ */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

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

/* ============================================
   Animated Background Grid
   ============================================ */

.cyber-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.03;
    background-image:
        linear-gradient(var(--cyan) 1px, transparent 1px),
        linear-gradient(90deg, var(--cyan) 1px, transparent 1px);
    background-size: 60px 60px;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(60px, 60px); }
}

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

.nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    z-index: 1000;
    transition: all 0.4s ease;
}

.nav.scrolled {
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: var(--border-subtle);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 40px;
    height: 40px;
}

.logo-icon svg {
    width: 100%;
    height: 100%;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

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

.nav-links {
    display: flex;
    gap: 40px;
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

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

.nav-links a:hover::after {
    width: 100%;
}

.nav-cta {
    padding: 12px 24px;
    background: var(--gradient-primary);
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--bg-primary);
    box-shadow: 0 4px 20px rgba(0, 240, 255, 0.3);
    transition: all 0.3s ease;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(0, 240, 255, 0.4);
}

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

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    padding: var(--nav-height) 0 60px;
    overflow: hidden;
}

.hero-bg-effects {
    position: absolute;
    top: 50%;
    left: 30%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    pointer-events: none;
}

.shield-pulse {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 400px;
    height: 400px;
    border: 2px solid var(--cyan);
    border-radius: 50%;
    opacity: 0;
    animation: shieldPulse 4s ease-out infinite;
}

.shield-pulse.delay-1 {
    animation-delay: 1.3s;
}

.shield-pulse.delay-2 {
    animation-delay: 2.6s;
}

@keyframes shieldPulse {
    0% {
        opacity: 0.5;
        transform: translate(-50%, -50%) scale(0.8);
    }
    100% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(2);
    }
}

.hero-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: fadeInUp 0.8s ease-out;
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 16px;
    background: rgba(0, 240, 255, 0.1);
    border: 1px solid rgba(0, 240, 255, 0.2);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--cyan);
    margin-bottom: 24px;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--cyan);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero-title {
    font-size: clamp(2.8rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

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

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin-bottom: 40px;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    align-items: center;
    gap: 40px;
    flex-wrap: wrap;
}

.app-store-btn {
    display: inline-block;
    transition: transform 0.3s ease;
}

.app-store-btn:hover {
    transform: scale(1.05);
}

.app-store-badge {
    height: 60px;
    width: auto;
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 24px;
}

.stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
}

/* Hero Visual */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.phone-mockup {
    position: relative;
    max-width: 380px;
}

.phone-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, var(--cyan-glow) 0%, transparent 70%);
    filter: blur(40px);
    animation: glowPulse 4s ease-in-out infinite;
}

@keyframes glowPulse {
    0%, 100% { opacity: 0.6; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 1; transform: translate(-50%, -50%) scale(1.1); }
}

.phone-image {
    position: relative;
    z-index: 1;
    filter: drop-shadow(0 20px 60px rgba(0, 0, 0, 0.5));
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--text-muted);
    font-size: 0.85rem;
    animation: fadeIn 1s ease-out 1s backwards;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* ============================================
   Section Styles
   ============================================ */

.section-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

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

.section-tag {
    display: inline-block;
    padding: 8px 20px;
    background: rgba(139, 92, 246, 0.1);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--purple);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 20px;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

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

.features {
    padding: var(--section-padding) 0;
    position: relative;
    background: var(--gradient-bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.feature-card {
    padding: 36px;
    background: rgba(255, 255, 255, 0.02);
    border: var(--border-subtle);
    border-radius: 20px;
    transition: all 0.4s ease;
    opacity: 0;
    transform: translateY(30px);
}

.feature-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.feature-card:nth-child(1) { transition-delay: 0.1s; }
.feature-card:nth-child(2) { transition-delay: 0.2s; }
.feature-card:nth-child(3) { transition-delay: 0.3s; }
.feature-card:nth-child(4) { transition-delay: 0.4s; }

.feature-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(0, 240, 255, 0.3);
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(0, 240, 255, 0.1);
}

.feature-card.featured {
    grid-column: span 2;
    background: linear-gradient(135deg, rgba(0, 240, 255, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
    border-color: rgba(0, 240, 255, 0.2);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 24px;
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.feature-desc {
    color: var(--text-secondary);
    line-height: 1.7;
}

.feature-tag {
    display: inline-block;
    margin-top: 20px;
    padding: 6px 14px;
    background: rgba(0, 240, 255, 0.1);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--cyan);
    font-family: var(--font-mono);
}

/* ============================================
   Preview Section
   ============================================ */

.preview {
    padding: var(--section-padding) 0;
    position: relative;
    overflow: hidden;
}

.preview-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.preview-wrapper.visible {
    opacity: 1;
    transform: translateY(0);
}

.preview-content .section-tag {
    background: rgba(0, 240, 255, 0.1);
    border-color: rgba(0, 240, 255, 0.2);
    color: var(--cyan);
}

.preview-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin: 24px 0 32px;
    line-height: 1.8;
}

.preview-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.preview-features li {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 1.05rem;
}

.check-icon {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 240, 255, 0.1);
    border-radius: 50%;
    color: var(--cyan);
    flex-shrink: 0;
}

.check-icon svg {
    width: 14px;
    height: 14px;
}

/* Preview Visual */
.preview-visual {
    display: flex;
    justify-content: center;
}

.preview-phone {
    position: relative;
    max-width: 320px;
}

.preview-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 250px;
    height: 250px;
    background: radial-gradient(circle, var(--purple-glow) 0%, transparent 70%);
    filter: blur(50px);
}

.preview-image {
    position: relative;
    z-index: 1;
    border-radius: 24px;
    filter: drop-shadow(0 30px 60px rgba(0, 0, 0, 0.4));
}

/* ============================================
   Download CTA Section
   ============================================ */

.download-cta {
    padding: var(--section-padding) 0;
    position: relative;
    overflow: hidden;
}

.cta-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.cta-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
}

.cta-orb.orb-1 {
    width: 500px;
    height: 500px;
    background: var(--cyan-glow);
    top: -200px;
    right: -100px;
}

.cta-orb.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--purple-glow);
    bottom: -150px;
    left: -100px;
}

.cta-content {
    text-align: center;
    position: relative;
    z-index: 1;
    max-width: 700px;
    margin: 0 auto;
    padding: 80px 40px;
    background: rgba(255, 255, 255, 0.02);
    border: var(--border-subtle);
    border-radius: 32px;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.cta-content.visible {
    opacity: 1;
    transform: translateY(0);
}

.cta-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 20px;
}

.cta-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 40px;
    line-height: 1.7;
}

.cta-button {
    display: inline-block;
    transition: transform 0.3s ease;
}

.cta-button:hover {
    transform: scale(1.05);
}

.cta-badge {
    height: 70px;
    width: auto;
}

.cta-trust {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 40px;
    padding-top: 40px;
    border-top: var(--border-subtle);
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.trust-item svg {
    width: 20px;
    height: 20px;
    color: var(--cyan);
}

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

.footer {
    padding: 60px 0 30px;
    background: var(--bg-secondary);
    border-top: var(--border-subtle);
}

.footer-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
}

.footer-tagline {
    color: var(--text-muted);
    margin-top: 16px;
    font-size: 0.95rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-col h4 {
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.footer-col a {
    display: block;
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 12px;
    transition: color 0.3s ease;
}

.footer-col a:hover {
    color: var(--cyan);
}

.footer-bottom {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 30px 24px 0;
    margin-top: 40px;
    border-top: var(--border-subtle);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

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

@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 60px;
    }

    .hero-content {
        max-width: 600px;
        margin: 0 auto;
    }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-cta {
        justify-content: center;
    }

    .feature-card.featured {
        grid-column: span 1;
    }

    .preview-wrapper {
        grid-template-columns: 1fr;
        gap: 60px;
        text-align: center;
    }

    .preview-content {
        order: 2;
    }

    .preview-visual {
        order: 1;
    }

    .preview-features {
        align-items: center;
    }

    .footer-container {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

@media (max-width: 768px) {
    :root {
        --nav-height: 70px;
    }

    .nav-links {
        display: none;
    }

    .hero-cta {
        flex-direction: column;
        gap: 30px;
    }

    .hero-stats {
        width: 100%;
        justify-content: center;
    }

    .phone-mockup {
        max-width: 280px;
    }

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

    .cta-trust {
        flex-direction: column;
        gap: 20px;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .scroll-indicator {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.2rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .feature-card {
        padding: 28px;
    }

    .cta-content {
        padding: 50px 24px;
    }

    .app-store-badge,
    .cta-badge {
        height: 50px;
    }
}