:root {
    --primary-purple: #667eea;
    --secondary-purple: #764ba2;
    --gradient-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    --text-dark: #333;
    --text-body: #555;
    --text-secondary: #666;
    --text-muted: #999;

    --bg-white: #ffffff;
    --bg-light-accent: #f8f9ff;
    --bg-neutral: #f0f0f0;
    --success-green: #6aaa64;

    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;

    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;

    --max-width-content: 800px;
    --max-width-wide: 1200px;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-body);
    background-color: var(--bg-white);
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-dark);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: 48px;
    font-weight: 700;
}

h2 {
    font-size: 32px;
}

h3 {
    font-size: 24px;
}

p {
    margin-bottom: 15px;
}

a {
    color: var(--primary-purple);
    text-decoration: none;
    transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
    opacity: 0.8;
}

ul, ol {
    padding-left: 30px;
    margin-bottom: 15px;
}

li {
    margin-bottom: 8px;
}

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

header {
    background: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    max-width: var(--max-width-wide);
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-purple);
}

.logo img {
    height: 40px;
    width: auto;
}

nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    padding: 0;
    margin: 0;
}

nav a {
    color: var(--text-dark);
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--border-radius-sm);
    transition: background-color 0.2s ease, color 0.2s ease;
}

nav a:hover {
    background-color: var(--bg-light-accent);
    color: var(--primary-purple);
    opacity: 1;
}

nav a.active {
    color: var(--primary-purple);
}

.container {
    max-width: var(--max-width-content);
    margin: 0 auto;
    padding: var(--spacing-md);
}

.container-wide {
    max-width: var(--max-width-wide);
    margin: 0 auto;
    padding: var(--spacing-md);
}

.hero {
    background: var(--gradient-bg);
    color: white;
    text-align: center;
    padding: var(--spacing-lg) var(--spacing-md);
    min-height: 300px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.hero h1 {
    color: white;
    margin-bottom: var(--spacing-sm);
    font-size: 56px;
}

.hero p {
    font-size: 20px;
    opacity: 0.95;
    max-width: 600px;
}

.section {
    padding: var(--spacing-lg) var(--spacing-md);
}

.section-title {
    text-align: center;
    color: var(--primary-purple);
    margin-bottom: var(--spacing-md);
}

.card {
    background: var(--bg-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.app-card {
    text-align: center;
}

.app-icon {
    width: 120px;
    height: 120px;
    border-radius: 24px;
    margin: 0 auto var(--spacing-sm);
    box-shadow: var(--shadow-md);
}

.app-card h3 {
    color: var(--primary-purple);
    font-size: 28px;
    margin-bottom: 15px;
}

.app-card p {
    color: var(--text-body);
    margin-bottom: var(--spacing-sm);
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    font-size: 16px;
}

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

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-white);
    color: var(--primary-purple);
    border: 2px solid var(--primary-purple);
}

.btn-secondary:hover {
    background: var(--bg-light-accent);
}

.btn-group {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-sm);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0;
}

.feature-card {
    background: var(--bg-neutral);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-sm);
}

.feature-card strong {
    display: block;
    color: var(--primary-purple);
    margin-bottom: 8px;
    font-size: 18px;
}

.highlight-box {
    background: var(--bg-light-accent);
    border-left: 4px solid var(--primary-purple);
    padding: var(--spacing-sm);
    margin: var(--spacing-sm) 0;
    border-radius: var(--border-radius-sm);
}

.highlight-box strong {
    color: var(--primary-purple);
    font-size: 18px;
}

footer {
    background: var(--gradient-bg);
    color: white;
    text-align: center;
    padding: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

footer a {
    color: white;
    text-decoration: underline;
}

footer a:hover {
    opacity: 0.8;
}

.footer-content {
    max-width: var(--max-width-wide);
    margin: 0 auto;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
}

.contact-section {
    background: var(--bg-light-accent);
    padding: var(--spacing-md) var(--spacing-md);
    text-align: center;
    border-radius: var(--border-radius-lg);
    margin: var(--spacing-md) 0;
}

.contact-section h2 {
    color: var(--primary-purple);
}

@media (max-width: 768px) {
    h1 {
        font-size: 32px;
    }

    h2 {
        font-size: 24px;
    }

    h3 {
        font-size: 20px;
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero p {
        font-size: 18px;
    }

    .header-content {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    nav ul {
        gap: var(--spacing-sm);
        font-size: 14px;
    }

    .section {
        padding: var(--spacing-sm) var(--spacing-sm);
    }

    .card-grid {
        grid-template-columns: 1fr;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

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

    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .container, .container-wide {
        padding: var(--spacing-sm);
    }

    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }

    nav a {
        padding: 6px 12px;
        font-size: 13px;
    }
}