/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-primary: #0ea5e9;
    --color-primary-dark: #0284c7;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-bg: #ffffff;
    --color-bg-light: #f8fafc;
    --color-bg-section: #f1f5f9;
    --color-border: #e2e8f0;
    --color-success: #10b981;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 8px;
    --radius-lg: 12px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

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

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

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

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

/* Buttons */
.btn-primary {
    background-color: var(--color-primary);
    color: white;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
    transition: background-color 0.2s, transform 0.1s;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-1px);
}

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

/* Hero Section */
.hero {
    padding: 5rem 0;
    text-align: center;
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-light) 100%);
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--color-text);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto 2.5rem;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.app-links {
    display: flex;
    gap: 1rem;
}

.app-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--color-text);
    font-weight: 500;
    transition: all 0.2s;
}

.app-link:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.app-link svg {
    width: 24px;
    height: 24px;
}

/* Section Styles */
section {
    padding: 5rem 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-light);
    text-align: center;
    margin-bottom: 3rem;
}

/* Features Section */
.features {
    background-color: var(--color-bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background-color: var(--color-bg);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid var(--color-border);
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

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

/* Download Section */
.download {
    background-color: var(--color-bg);
}

.download-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background-color: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--color-text);
    transition: all 0.2s;
}

.download-btn:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.download-btn.web-btn:hover {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.download-btn svg {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
}

.download-btn div {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.download-btn strong {
    font-size: 1.125rem;
    font-weight: 600;
    display: block;
    margin-bottom: 0.25rem;
}

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

.download-btn.web-btn:hover span {
    color: rgba(255, 255, 255, 0.9);
}

/* About Section */
.about {
    background-color: var(--color-bg-section);
}

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

.about-text {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.about-text:last-child {
    margin-bottom: 0;
}

/* Footer */
.footer {
    background-color: var(--color-text);
    color: rgba(255, 255, 255, 0.8);
    padding: 2rem 0;
    text-align: center;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .nav-links a:not(.btn-primary) {
        display: none;
    }

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

    .download-buttons {
        grid-template-columns: 1fr;
    }

    .app-links {
        flex-direction: column;
        width: 100%;
    }

    .app-link {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 3rem 0;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    section {
        padding: 3rem 0;
    }

    .container {
        padding: 0 16px;
    }
}