/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
    /* Colors - Dark theme inspired by Apple */
    --color-bg: #000000;
    --color-bg-secondary: #111111;
    --color-bg-tertiary: #1a1a1a;
    --color-text: #f5f5f7;
    --color-text-secondary: #a1a1a6;
    --color-text-tertiary: #6e6e73;
    --color-primary: #2997ff;
    --color-primary-hover: #0077ed;
    --color-border: #2d2d2d;
    --color-success: #30d158;
    
    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 96px;
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Courier New', monospace;
    
    /* Layout */
    --max-width: 1200px;
    --nav-height: 60px;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 20px;
}

/* Light mode override */
@media (prefers-color-scheme: light) {
    :root {
        --color-bg: #ffffff;
        --color-bg-secondary: #f5f5f7;
        --color-bg-tertiary: #e8e8ed;
        --color-text: #1d1d1f;
        --color-text-secondary: #6e6e73;
        --color-text-tertiary: #86868b;
        --color-border: #d2d2d7;
    }
}

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

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

body {
    font-family: var(--font-sans);
    font-size: 17px;
    line-height: 1.5;
    color: var(--color-text);
    background: var(--color-bg);
}

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

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

a:hover {
    text-decoration: underline;
}

/* ========================================
   Layout
   ======================================== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

section {
    padding: var(--space-4xl) 0;
}

section h2 {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-3xl);
    letter-spacing: -0.02em;
}

/* ========================================
   Navigation
   ======================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
}

@media (prefers-color-scheme: light) {
    .nav {
        background: rgba(255, 255, 255, 0.8);
    }
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    font-size: 18px;
    color: var(--color-text);
    text-decoration: none;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-links a {
    color: var(--color-text-secondary);
    font-size: 14px;
    text-decoration: none;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--color-text);
    text-decoration: none;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    position: relative;
}

.nav-toggle span::before,
.nav-toggle span::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: inherit;
    left: 0;
}

.nav-toggle span::before { top: -8px; }
.nav-toggle span::after { top: 8px; }

/* Mobile nav */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-links {
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-bg);
        padding: var(--space-lg);
        gap: var(--space-md);
        border-bottom: 1px solid var(--color-border);
        display: none;
    }
    
    .nav-links.active {
        display: flex;
    }
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    border-radius: 980px;
    font-size: 17px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
}

.btn:hover {
    text-decoration: none;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background: var(--color-primary-hover);
}

.btn-secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text);
}

.btn-secondary:hover {
    background: var(--color-border);
}

.btn-small {
    padding: 8px 16px;
    font-size: 14px;
}

.btn-large {
    padding: 18px 36px;
    font-size: 18px;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    padding-top: calc(var(--nav-height) + var(--space-4xl));
    padding-bottom: var(--space-4xl);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

@media (max-width: 900px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

.hero h1 {
    font-size: clamp(40px, 7vw, 72px);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-lg);
}

.hero-subtitle {
    font-size: 21px;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
    max-width: 540px;
}

@media (max-width: 900px) {
    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }
}

.hero-buttons {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

@media (max-width: 900px) {
    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }
}

.hero-meta {
    font-size: 13px;
    color: var(--color-text-tertiary);
}

.hero-image {
    display: flex;
    justify-content: center;
}

.screenshot {
    border-radius: var(--border-radius-lg);
    box-shadow: 
        0 0 0 1px rgba(255,255,255,0.1),
        0 20px 50px rgba(0,0,0,0.5);
    max-width: 100%;
}

/* ========================================
   Features Section
   ======================================== */
.features {
    background: var(--color-bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
}

.feature {
    text-align: center;
    padding: var(--space-xl);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: var(--space-md);
}

.feature h3 {
    font-size: 21px;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

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

/* ========================================
   Showcase Section
   ======================================== */
.showcase {
    background: var(--color-bg);
}

.showcase-image {
    max-width: 900px;
    margin: 0 auto;
}

.showcase-image img {
    border-radius: var(--border-radius-lg);
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.video-wrapper {
    max-width: 900px;
    margin: 0 auto;
    aspect-ratio: 16/9;
}

.video-wrapper iframe {
    width: 100%;
    height: 100%;
    border: none;
    border-radius: var(--border-radius);
}

/* ========================================
   Pricing Section
   ======================================== */
.pricing {
    background: var(--color-bg-secondary);
}

.pricing-card {
    max-width: 400px;
    margin: 0 auto;
    background: var(--color-bg);
    border-radius: var(--border-radius-lg);
    padding: var(--space-2xl);
    text-align: center;
    border: 1px solid var(--color-border);
}

.pricing-header {
    margin-bottom: var(--space-xl);
}

.pricing-name {
    display: block;
    font-size: 24px;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.pricing-price .price {
    font-size: 64px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.pricing-price .period {
    display: block;
    color: var(--color-text-secondary);
    font-size: 15px;
}

.pricing-features {
    list-style: none;
    text-align: left;
    margin-bottom: var(--space-xl);
}

.pricing-features li {
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-note {
    margin-top: var(--space-md);
    font-size: 13px;
    color: var(--color-text-tertiary);
}

/* ========================================
   FAQ Section
   ======================================== */
.faq {
    background: var(--color-bg);
}

.faq-grid {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--color-border);
}

.faq-item summary {
    padding: var(--space-lg) 0;
    cursor: pointer;
    font-weight: 500;
    font-size: 17px;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-item summary::after {
    content: '+';
    font-size: 24px;
    color: var(--color-text-secondary);
}

.faq-item[open] summary::after {
    content: '−';
}

.faq-item p {
    padding: 0 0 var(--space-lg);
    color: var(--color-text-secondary);
}

/* ========================================
   CTA Section
   ======================================== */
.cta {
    background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg) 100%);
    text-align: center;
}

.cta h2 {
    margin-bottom: var(--space-md);
}

.cta p {
    color: var(--color-text-secondary);
    font-size: 21px;
    margin-bottom: var(--space-xl);
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--color-bg);
    padding: var(--space-3xl) 0 var(--space-xl);
    border-top: 1px solid var(--color-border);
}

.footer-container {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-3xl);
}

@media (max-width: 700px) {
    .footer-container {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

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

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

@media (max-width: 500px) {
    .footer-links {
        grid-template-columns: 1fr;
    }
}

.footer-column h4 {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
}

.footer-column a {
    display: block;
    color: var(--color-text);
    font-size: 14px;
    padding: var(--space-xs) 0;
}

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

.footer-bottom {
    margin-top: var(--space-2xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: var(--color-text-tertiary);
}