:root {
    /* Light Theme (Default) */
    --bg-color: #F6F2ED;
    --card-bg: #FFFFFF;
    --text-primary: #2D2D2D;
    --text-secondary: #636366;
    --accent-color: #FFCC4D;
    --accent-deep: #D4AF37;
    --border-color: rgba(0, 0, 0, 0.05);
    --shadow-color: rgba(0, 0, 0, 0.06);
    --font-main: 'SF Pro Text', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --border-radius: 16px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #121212;
        --card-bg: #1C1C1E;
        --text-primary: #F5F5F5;
        --text-secondary: #8E8E93;
        --border-color: rgba(255, 255, 255, 0.1);
        --shadow-color: rgba(0, 0, 0, 0.2);
    }
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
header {
    padding: 48px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 14px;
    font-weight: 700;
    font-size: 1.4rem;
    letter-spacing: -0.02em;
}

.logo img {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    box-shadow: 0 4px 12px var(--shadow-color);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 80px 0 120px;
}

.app-icon-large {
    width: 160px;
    height: 160px;
    margin-bottom: 48px;
    border-radius: 36px;
    box-shadow: 0 20px 40px var(--shadow-color);
}

h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.04em;
}

.subtitle {
    font-size: 1.4rem;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto 48px;
    font-weight: 400;
}

/* Buttons */
.cta-button {
    display: inline-block;
    padding: 16px 32px;
    background-color: var(--text-primary);
    color: var(--bg-color);
    text-decoration: none;
    border-radius: 14px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.cta-button:hover {
    transform: scale(1.02);
    opacity: 0.9;
}

.cta-button.secondary {
    background-color: transparent;
    border: 1.5px solid var(--text-primary);
    color: var(--text-primary);
    margin-top: 16px;
}

/* Features */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    padding-bottom: 120px;
}

.feature-card {
    background-color: var(--card-bg);
    padding: 40px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 24px var(--shadow-color);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
}

.feature-card .icon-box {
    width: 48px;
    height: 48px;
    background-color: var(--accent-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: #000;
    font-weight: bold;
}

.feature-card h3 {
    margin-bottom: 12px;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

/* Footer */
footer {
    padding: 80px 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
}

.footer-links {
    margin-bottom: 32px;
    display: flex;
    justify-content: center;
    gap: 40px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

.copyright {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Utilities */
.accent-text {
    color: var(--accent-deep);
}

/* Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    .subtitle {
        font-size: 1.1rem;
    }

    .hero {
        padding: 40px 0 80px;
    }
}