:root {
    --google-blue: #1a73e8;
    --google-red: #ea4335;
    --google-yellow: #fbbc04;
    --google-green: #34a853;
    --google-bg: #ffffff;
    --google-text: #202124;
    --google-text-dim: #5f6368;
    --google-border: #dadce0;
    --google-surface: #f8f9fa;
    --google-shadow: 0 1px 2px 0 rgba(60,64,67,.30), 0 1px 3px 1px rgba(60,64,67,.15);
    --google-shadow-hover: 0 1px 3px 0 rgba(60,64,67,.30), 0 4px 8px 3px rgba(60,64,67,.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Google Sans', 'Roboto', Arial, sans-serif;
}

body {
    background-color: var(--google-bg);
    color: var(--google-text);
    line-height: 1.5;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.g-header {
    height: 64px;
    background: white;
    border-bottom: 1px solid var(--google-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
}

.header-flex {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.g-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    font-size: 22px;
    font-weight: 500;
    color: var(--google-text-dim);
}

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

.nav-links {
    display: flex;
    gap: 24px;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--google-text-dim);
    font-size: 14px;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 4px;
    transition: background 0.2s;
}

.nav-links a:hover {
    background: var(--google-surface);
    color: var(--google-text);
}

/* Hero Section */
.hero {
    padding: 100px 0 80px;
    text-align: center;
}

.hero-h1 {
    font-size: 56px;
    font-weight: 400;
    letter-spacing: -0.5px;
    line-height: 1.2;
    margin-bottom: 24px;
    color: var(--google-text);
}

.hero-p {
    font-size: 20px;
    color: var(--google-text-dim);
    max-width: 800px;
    margin: 0 auto 40px;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 12px 24px;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: box-shadow 0.2s, background 0.2s;
}

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

.btn-primary:hover {
    background-color: #1967d2;
    box-shadow: 0 1px 3px 1px rgba(66,133,244,.15), 0 1px 2px 0 rgba(66,133,244,.30);
}

.btn-outline {
    background-color: white;
    color: var(--google-blue);
    border: 1px solid var(--google-border);
}

.btn-outline:hover {
    background-color: var(--google-surface);
}

/* Features Section */
.features {
    padding: 80px 0;
    background-color: white;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature-card {
    padding: 32px;
    border-radius: 8px;
    transition: background 0.3s;
}

.feature-card:hover {
    background: var(--google-surface);
}

.feature-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 24px;
}

.feature-h3 {
    font-size: 24px;
    font-weight: 400;
    margin-bottom: 16px;
}

.feature-p {
    color: var(--google-text-dim);
    font-size: 16px;
}

/* Info Banner */
.info-banner {
    padding: 80px 0;
    background-color: var(--google-surface);
    text-align: center;
}

.info-h2 {
    font-size: 36px;
    font-weight: 400;
    margin-bottom: 40px;
}

/* Download Section */
.dl-section {
    padding: 80px 0;
}

.dl-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.dl-card {
    background: white;
    border: 1px solid var(--google-border);
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    transition: box-shadow 0.3s;
}

.dl-card:hover {
    box-shadow: var(--google-shadow-hover);
}

.dl-h3 {
    font-size: 20px;
    font-weight: 500;
    margin-bottom: 16px;
}

/* Footer */
.g-footer {
    background: var(--google-surface);
    padding: 40px 0;
    border-top: 1px solid var(--google-border);
    color: var(--google-text-dim);
    font-size: 14px;
}

.footer-links {
    display: flex;
    gap: 24px;
    margin-bottom: 24px;
}

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

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

@media (max-width: 900px) {
    .hero-h1 { font-size: 40px; }
    .dl-grid { grid-template-columns: 1fr; }
}