/* ============================================
   CSS Reset & Base Styles
   ============================================ */

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

:root {
    --color-bg: #000000;
    --color-bg-secondary: #0a0a0a;
    --color-bg-card: #1a1a1a;
    --color-text-primary: #ffffff;
    --color-text-secondary: #a0a0a0;
    --color-text-muted: #666666;
    --color-accent: #3b82f6;
    --color-accent-hover: #2563eb;
    --color-border: #2a2a2a;
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    --max-width: 1200px;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

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

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

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

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.container-narrow {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ============================================
   Header & Navigation
   ============================================ */

.header {
    background-color: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    transition: var(--transition);
}

.logo:hover {
    opacity: 0.8;
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text-primary);
}

.nav {
    display: flex;
    gap: 32px;
}

.nav a {
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: 16px;
    transition: var(--transition);
}

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

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

.hero {
    padding: 120px 0 80px;
    text-align: center;
    background: radial-gradient(ellipse at center, rgba(59, 130, 246, 0.1) 0%, transparent 70%);
}

.hero-title {
    font-size: 72px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #ffffff 0%, #a0a0a0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 28px;
    color: var(--color-text-secondary);
    margin-bottom: 40px;
    font-weight: 400;
}

.hero-meta {
    margin-top: 24px;
    color: var(--color-text-muted);
    font-size: 16px;
}

.hero-meta strong {
    color: var(--color-text-secondary);
}

/* ============================================
   Buttons
   ============================================ */

.btn-primary {
    display: inline-block;
    background-color: var(--color-text-primary);
    color: var(--color-bg);
    padding: 16px 40px;
    font-size: 18px;
    font-weight: 600;
    border-radius: 50px;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(255, 255, 255, 0.2);
}

/* ============================================
   App Showcase Section
   ============================================ */

.app-showcase-section {
    padding: 80px 0;
    background-color: var(--color-bg-secondary);
}

.showcase-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

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

.showcase-image {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    margin-bottom: 24px;
    transition: var(--transition);
}

.showcase-image:hover {
    transform: translateY(-8px);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
}

.showcase-image img {
    width: 100%;
    height: auto;
    display: block;
}

.showcase-content h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--color-text-primary);
}

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

/* ============================================
   Key Feature Section
   ============================================ */

.key-feature {
    padding: 100px 0;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, transparent 100%);
}

.key-feature-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.key-badge {
    display: inline-block;
    padding: 8px 20px;
    background-color: rgba(59, 130, 246, 0.2);
    color: var(--color-accent);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 24px;
}

.key-feature-content h2 {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 24px;
    line-height: 1.2;
}

.key-description {
    font-size: 20px;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

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

.features {
    padding: 100px 0;
}

.section-title {
    font-size: 48px;
    font-weight: 800;
    text-align: center;
    margin-bottom: 16px;
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 20px;
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

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

.feature-card:hover {
    border-color: var(--color-text-muted);
    transform: translateY(-4px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--color-text-primary);
}

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

.feature-label {
    display: inline-block;
    padding: 4px 12px;
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--color-accent);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ============================================
   Secondary Highlight Section
   ============================================ */

.secondary-highlight {
    padding: 100px 0;
    background-color: var(--color-bg-secondary);
}

.secondary-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.secondary-image img {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.5));
}

.secondary-text h2 {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 24px;
    line-height: 1.2;
}

.secondary-text p {
    font-size: 18px;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
    line-height: 1.8;
}

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

.secondary-features li {
    font-size: 18px;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
    padding-left: 8px;
}

/* ============================================
   Pro Version Section
   ============================================ */

.pro-section {
    padding: 100px 0;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(147, 51, 234, 0.1) 100%);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.pro-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.pro-badge {
    display: inline-block;
    padding: 8px 20px;
    background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    color: white;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 24px;
}

.pro-content h2 {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.2;
    background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.pro-description {
    font-size: 24px;
    color: var(--color-text-secondary);
    margin-bottom: 60px;
}

.pro-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 60px;
    text-align: left;
}

.pro-feature {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 24px;
    transition: var(--transition);
}

.pro-feature:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.2);
}

.pro-check {
    width: 32px;
    height: 32px;
    min-width: 32px;
    background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
}

.pro-feature h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--color-text-primary);
}

.pro-feature p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.pro-cta {
    text-align: center;
    margin-top: 40px;
}

.pro-note {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
}

.pro-note strong {
    color: var(--color-text-primary);
}

.pro-cta .btn-primary {
    margin-top: 24px;
}

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

.footer {
    border-top: 1px solid var(--color-border);
    padding: 40px 0;
    margin-top: 100px;
}

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

.footer p {
    color: var(--color-text-muted);
    font-size: 14px;
}

.footer-nav {
    display: flex;
    gap: 24px;
}

.footer-nav a {
    color: var(--color-text-muted);
    font-size: 14px;
    transition: var(--transition);
}

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

/* ============================================
   Content Pages (Privacy & Contact)
   ============================================ */

.content-page {
    padding: 80px 0;
}

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

.privacy-icon,
.contact-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.page-header h1 {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 16px;
}

.page-intro {
    font-size: 20px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.content-section {
    margin-bottom: 48px;
}

.content-section h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--color-text-primary);
}

.content-section h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--color-text-primary);
}

.content-section p {
    font-size: 18px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.content-list {
    list-style: none;
    margin: 20px 0;
}

.content-list li {
    font-size: 18px;
    color: var(--color-text-secondary);
    padding: 12px 0 12px 32px;
    position: relative;
}

.content-list li:before {
    content: "•";
    position: absolute;
    left: 12px;
    color: var(--color-accent);
    font-size: 24px;
}

.content-list li strong {
    color: var(--color-text-primary);
}

.privacy-summary {
    background-color: var(--color-bg-card);
    border: 2px solid var(--color-accent);
    border-radius: var(--border-radius);
    padding: 40px;
    margin-top: 60px;
    text-align: center;
}

.privacy-summary h3 {
    font-size: 28px;
    margin-bottom: 16px;
}

.privacy-summary p {
    font-size: 18px;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
}

.privacy-summary p:last-child {
    margin-bottom: 0;
}

/* ============================================
   Contact Methods
   ============================================ */

.contact-methods-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 60px;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.contact-method {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 40px 30px;
    transition: var(--transition);
}

.contact-method:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.method-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.method-content h4 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-text-primary);
}

.method-content p {
    font-size: 16px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.method-content a {
    color: var(--color-accent);
    text-decoration: none;
    transition: var(--transition);
}

.method-content a:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

/* ============================================
   FAQ Section
   ============================================ */

.faq-section {
    margin-top: 80px;
    padding-top: 80px;
    border-top: 1px solid var(--color-border);
}

.faq-section h2 {
    font-size: 42px;
    font-weight: 800;
    text-align: center;
    margin-bottom: 48px;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.faq-item {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 32px;
}

.faq-item h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--color-text-primary);
}

.faq-item p {
    font-size: 16px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

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

@media (max-width: 1024px) {
    .secondary-content {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .contact-methods-row {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 48px;
    }

    .hero-subtitle {
        font-size: 20px;
    }

    .key-feature-content h2 {
        font-size: 38px;
    }

    .section-title {
        font-size: 36px;
    }

    .secondary-text h2 {
        font-size: 32px;
    }

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

    .showcase-grid {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .pro-content h2 {
        font-size: 38px;
    }

    .pro-description {
        font-size: 18px;
    }

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

    .nav {
        gap: 20px;
    }

    .footer .container {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

    .page-header h1 {
        font-size: 38px;
    }

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

@media (max-width: 480px) {
    .hero {
        padding: 80px 0 60px;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .logo-text {
        display: none;
    }

    .nav {
        gap: 16px;
    }

    .nav a {
        font-size: 14px;
    }

    .btn-primary {
        padding: 14px 32px;
        font-size: 16px;
    }

    .slide-caption {
        padding: 30px 20px 20px;
    }

    .slide-caption h3 {
        font-size: 20px;
    }

    .slide-caption p {
        font-size: 14px;
    }

    .key-feature-content h2 {
        font-size: 32px;
    }

    .key-description {
        font-size: 18px;
    }

    .section-title {
        font-size: 28px;
    }

    .section-subtitle {
        font-size: 16px;
    }

    .feature-card {
        padding: 24px;
    }

    .pro-content h2 {
        font-size: 32px;
    }

    .pro-description {
        font-size: 16px;
    }

    .pro-feature {
        padding: 20px;
    }

    .pro-note {
        font-size: 14px;
    }

    .contact-method {
        padding: 30px 20px;
    }
}

/* ============================================
   Animations & Transitions
   ============================================ */

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

.feature-card,
.faq-item,
.contact-method {
    animation: slideUp 0.6s ease-out;
}

/* ============================================
   Utility Classes
   ============================================ */

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

.mt-4 {
    margin-top: 32px;
}

.mb-4 {
    margin-bottom: 32px;
}

.hidden {
    display: none;
}