/* ================================
   CSS Custom Properties & Reset
   ================================ */

:root {
    /* Colors - Light Mode */
    --color-bg: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-bg-tertiary: #e9ecef;
    --color-text: #1a1a1a;
    --color-text-secondary: #6c757d;
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-accent: #f97316;
    --color-accent-light: #fb923c;
    --color-border: #e5e7eb;
    --color-card-bg: #ffffff;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;

    /* Effects */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0a0a0a;
        --color-bg-secondary: #1a1a1a;
        --color-bg-tertiary: #2a2a2a;
        --color-text: #f5f5f5;
        --color-text-secondary: #a0a0a0;
        --color-primary: #3b82f6;
        --color-primary-dark: #2563eb;
        --color-accent: #fb923c;
        --color-accent-light: #fdba74;
        --color-border: #333333;
        --color-card-bg: #151515;
        --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
        --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
    }
}

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

html {
    scroll-behavior: smooth;
}

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

/* ================================
   Typography
   ================================ */

h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 700;
    letter-spacing: -0.02em;
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-xl); }

a {
    color: inherit;
    text-decoration: none;
}

/* ================================
   Layout
   ================================ */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

section {
    padding: var(--spacing-3xl) 0;
}

/* ================================
   Header
   ================================ */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.8);
    z-index: 1000;
    padding: var(--spacing-md) 0;
}

@media (prefers-color-scheme: dark) {
    .header {
        background-color: rgba(10, 10, 10, 0.8);
    }
}

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

.logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

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

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

.nav .cta-link {
    color: var(--color-primary);
    font-weight: 600;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

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

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

.hero {
    padding-top: calc(var(--spacing-3xl) + 80px);
    padding-bottom: var(--spacing-3xl);
    background:
        radial-gradient(circle at 20% 50%, rgba(37, 99, 235, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(249, 115, 22, 0.1) 0%, transparent 50%);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.hero-title {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--spacing-lg);
    line-height: 1.1;
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.hero-badges {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1rem;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
}

/* ================================
   Problem Section
   ================================ */

.problem {
    background-color: var(--color-bg-secondary);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
}

.section-header h2 {
    margin-bottom: var(--spacing-md);
}

.section-header p {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.problem-card {
    background-color: var(--color-card-bg);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.problem-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.problem-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.problem-card h3 {
    margin-bottom: var(--spacing-sm);
}

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

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    padding: var(--spacing-xl);
    background-color: var(--color-card-bg);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

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

.feature-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    margin-bottom: var(--spacing-sm);
}

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

/* ================================
   Highlight Section (CarPlay)
   ================================ */

.highlight {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
}

.highlight-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.highlight-label {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
}

.highlight-text h2 {
    margin-bottom: var(--spacing-md);
    color: white;
}

.highlight-text p {
    font-size: var(--font-size-lg);
    line-height: 1.7;
    opacity: 0.9;
    margin-bottom: var(--spacing-md);
}

.highlight-note {
    font-size: var(--font-size-base);
    opacity: 0.8;
    font-style: italic;
}

/* Mockup Placeholder */
.mockup-placeholder {
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    backdrop-filter: blur(10px);
}

.mockup-screen {
    background-color: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    aspect-ratio: 16 / 9;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.mockup-gauge {
    flex: 1;
    background: linear-gradient(135deg, rgba(249, 115, 22, 0.3), rgba(249, 115, 22, 0.1));
    border-radius: var(--radius-md);
}

.mockup-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.mockup-metric {
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    height: 60px;
}

/* ================================
   Waitlist Section
   ================================ */

.waitlist {
    background-color: var(--color-bg-secondary);
}

.waitlist-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.waitlist-content h2 {
    margin-bottom: var(--spacing-md);
}

.waitlist-content > p {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

.waitlist-form {
    margin-bottom: var(--spacing-md);
}

.form-group {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.form-group input {
    flex: 1;
    padding: 0.875rem 1.25rem;
    font-size: var(--font-size-base);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-sans);
    transition: all var(--transition-base);
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

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

.footer {
    background-color: var(--color-bg-tertiary);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand p {
    color: var(--color-text-secondary);
    margin-top: var(--spacing-sm);
}

.footer-links {
    display: flex;
    gap: var(--spacing-2xl);
}

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

.footer-column a {
    display: block;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-base);
}

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

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-bottom p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

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

@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2.25rem;
        --font-size-3xl: 1.75rem;
        --spacing-3xl: 3rem;
    }

    .nav {
        gap: var(--spacing-md);
    }

    .hero-title {
        font-size: var(--font-size-4xl);
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

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

    .highlight-content {
        grid-template-columns: 1fr;
    }

    .mockup-placeholder {
        order: -1;
    }

    .form-group {
        flex-direction: column;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .footer-links {
        gap: var(--spacing-xl);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .nav a:not(.cta-link) {
        display: none;
    }
}