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

:root {
    --color-primary: #0066cc;
    --color-primary-dark: #0052a3;
    --color-text: #1a1a1a;
    --color-text-light: #666;
    --color-bg: #ffffff;
    --color-bg-alt: #f8f9fa;
    --color-border: #e5e5e5;
    --color-added: #e6ffed;
    --color-removed: #ffeef0;
    --color-modified: #fff5b1;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --max-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
}

/* Typography */
h1, h2, h3 {
    line-height: 1.2;
    font-weight: 600;
}

h1 { font-size: 3rem; }
h2 { font-size: 2rem; margin-bottom: var(--spacing-md); }
h3 { font-size: 1.25rem; margin-bottom: var(--spacing-xs); }

@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
}

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

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
}

nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1rem var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-icon-img {
    width: 32px;
    height: 32px;
    border-radius: 6px;
}

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

.nav-links a {
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
}

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

/* Hero Section */
.hero {
    padding: calc(80px + var(--spacing-xl)) var(--spacing-md) var(--spacing-xl);
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

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

.hero-content h1 {
    margin-bottom: var(--spacing-md);
}

.highlight {
    color: var(--color-primary);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.hero-cta {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    align-items: flex-start;
}

@media (max-width: 900px) {
    .hero-cta {
        align-items: center;
    }
}

.hero-note {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

/* App Preview */
.app-preview {
    background: #1e1e1e;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.preview-header {
    background: #2d2d2d;
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.window-controls {
    display: flex;
    gap: 6px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27ca40; }

.preview-title {
    color: #888;
    font-size: 0.875rem;
    margin-left: auto;
    margin-right: auto;
}

.preview-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: #333;
}

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

@media (max-width: 600px) {
    .preview-content.three-columns {
        grid-template-columns: 1fr;
    }
}

.preview-column {
    background: #1e1e1e;
    padding: 1rem;
}

.preview-filename {
    color: #888;
    font-size: 0.75rem;
    margin-bottom: 0.5rem;
    font-family: monospace;
}

.preview-line {
    font-family: monospace;
    font-size: 0.8rem;
    color: #ccc;
    padding: 0.25rem 0.5rem;
    margin: 2px 0;
    border-radius: 3px;
}

.preview-line.added { background: rgba(46, 160, 67, 0.3); }
.preview-line.removed { background: rgba(248, 81, 73, 0.3); }
.preview-line.modified { background: rgba(255, 213, 79, 0.3); }

/* Pain Point Section */
.pain-point {
    background: var(--color-bg-alt);
    padding: var(--spacing-xl) var(--spacing-md);
    text-align: center;
}

.pain-point h2 {
    max-width: 700px;
    margin: 0 auto var(--spacing-sm);
}

.pain-point p {
    max-width: 600px;
    margin: 0 auto;
    color: var(--color-text-light);
}

/* Features Section */
.features {
    padding: var(--spacing-xl) var(--spacing-md);
    max-width: var(--max-width);
    margin: 0 auto;
    text-align: center;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.feature {
    padding: var(--spacing-md);
    border-radius: 12px;
    background: var(--color-bg-alt);
    text-align: left;
}

.feature.featured {
    background: linear-gradient(135deg, #e8f4fd 0%, #f0f7ff 100%);
    border: 2px solid var(--color-primary);
    position: relative;
}

.feature.featured::before {
    content: "Key Feature";
    position: absolute;
    top: -10px;
    left: 16px;
    background: var(--color-primary);
    color: white;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.feature p {
    color: var(--color-text-light);
}

/* Audience Section */
.audience {
    background: var(--color-bg-alt);
    padding: var(--spacing-xl) var(--spacing-md);
    text-align: center;
}

.audience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    max-width: var(--max-width);
    margin: var(--spacing-lg) auto 0;
}

.audience-item {
    padding: var(--spacing-md);
}

.audience-item strong {
    display: block;
    margin-bottom: var(--spacing-xs);
}

.audience-item p {
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* Pricing Section */
.pricing {
    padding: var(--spacing-xl) var(--spacing-md);
    text-align: center;
}

.pricing-card {
    max-width: 400px;
    margin: var(--spacing-lg) auto 0;
    padding: var(--spacing-lg);
    background: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: 16px;
}

.price {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 0.25rem;
    margin-bottom: var(--spacing-xs);
}

.currency {
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 0.5rem;
}

.amount {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1;
}

.price-note {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

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

.pricing-features li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--color-border);
}

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

/* Download Section */
.download {
    background: var(--color-bg-alt);
    padding: var(--spacing-xl) var(--spacing-md);
    text-align: center;
}

.download-options {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0 var(--spacing-md);
    flex-wrap: wrap;
}

.download-option {
    text-decoration: none;
}

.download-option.appstore img {
    height: 60px;
}

.download-divider {
    color: var(--color-text-light);
}

.download-option.direct {
    display: flex;
    flex-direction: column;
    padding: 1rem 2rem;
    background: var(--color-text);
    color: white;
    border-radius: 12px;
    transition: transform 0.2s ease;
}

.download-option.direct:hover {
    transform: translateY(-2px);
}

.direct-label {
    font-weight: 600;
    font-size: 1.125rem;
}

.direct-note {
    font-size: 0.875rem;
    opacity: 0.8;
}

.download-note {
    color: var(--color-text-light);
    font-size: 0.875rem;
}

/* Footer */
footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) var(--spacing-md);
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    text-align: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
}

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

.footer-links a {
    color: var(--color-text-light);
    text-decoration: none;
}

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

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

/* Utility: Mobile Menu (can extend later) */
@media (max-width: 600px) {
    .nav-links a:not(.btn) {
        display: none;
    }
}

/* Legal Pages */
.legal-page {
    padding: calc(80px + var(--spacing-lg)) var(--spacing-md) var(--spacing-xl);
}

.legal-content {
    max-width: 800px;
    margin: 0 auto;
}

.legal-content h1 {
    margin-bottom: var(--spacing-xs);
}

.legal-content .last-updated {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.legal-content section {
    margin-bottom: var(--spacing-lg);
}

.legal-content h2 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.legal-content p {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.legal-content ul {
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.legal-content li {
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.legal-content a {
    color: var(--color-primary);
}