/* ===================================
   GATEAGENT - MODERN LIGHT THEME
   Off-white background with orange accents
   =================================== */

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

:root {
    /* Light Theme Colors */
    --color-bg-primary: #fafafa;
    --color-bg-secondary: #ffffff;
    --color-bg-card: #ffffff;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #525252;
    --color-text-tertiary: #737373;
    --color-border: #e5e5e5;
    --color-border-hover: #d4d4d4;

    /* Orange Accent - warm and tasteful */
    --color-accent: #f97316;
    --color-accent-hover: #ea580c;
    --color-accent-light: #fff7ed;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.75rem;
    --font-size-3xl: 2.5rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;

    /* Transitions */
    --transition-base: 0.2s ease;
    --transition-slow: 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

/* ===================================
   NAVIGATION
   =================================== */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(250, 250, 250, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo-link {
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

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

/* ===================================
   BUTTONS
   =================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
}

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

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

.btn-secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-border-hover);
}

.btn-large {
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-base);
}

/* ===================================
   HERO SECTION
   =================================== */

.hero {
    padding: 10rem 0 5rem;
    background: var(--color-bg-primary);
}

.hero-content {
    max-width: 700px;
}

.hero-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.03em;
    color: var(--color-text-primary);
}

.gradient-text {
    color: var(--color-text-primary);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-tertiary);
    font-weight: 400;
    margin-bottom: var(--spacing-xl);
    line-height: 1.5;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-2xl);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* ===================================
   FEATURES SECTION
   =================================== */

.timeline {
    padding: var(--spacing-3xl) 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.section-header {
    margin-bottom: var(--spacing-3xl);
}

.section-label {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
    position: relative;
    padding-bottom: var(--spacing-xs);
}

.section-label::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent), transparent);
    border-radius: 2px;
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    max-width: 500px;
}

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

.timeline-card {
    padding: var(--spacing-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-slow);
}

.timeline-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 4px 20px rgba(249, 115, 22, 0.08);
}

.timeline-heading {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.timeline-description {
    color: var(--color-text-secondary);
    line-height: 1.6;
    font-size: var(--font-size-base);
}

/* ===================================
   SANDBOX SECTION
   =================================== */

.sandbox {
    padding: var(--spacing-3xl) 0;
    background: var(--color-bg-primary);
}

.sandbox-content {
    max-width: 700px;
    margin: 0 auto;
}

.sandbox-card {
    padding: var(--spacing-2xl);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-slow);
    text-align: center;
}

.sandbox-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 4px 20px rgba(249, 115, 22, 0.08);
}

.sandbox-heading {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.sandbox-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-xl);
}

/* ===================================
   CONTACT SECTION
   =================================== */

.contact {
    padding: var(--spacing-3xl) 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

.contact-content {
    text-align: center;
    max-width: 500px;
    margin: 0 auto;
}

.contact-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

.contact-text {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

.contact-link {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-base);
}

.contact-link:hover {
    color: var(--color-accent-hover);
}

/* ===================================
   FOOTER
   =================================== */

.footer {
    padding: var(--spacing-2xl) 0;
    background: var(--color-bg-primary);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-logo {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.footer-tagline {
    color: var(--color-text-tertiary);
    font-size: var(--font-size-sm);
}

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

.footer-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-base);
}

.footer-link:hover {
    color: var(--color-accent);
}

.footer-bottom {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.footer-copyright {
    color: var(--color-text-tertiary);
    font-size: var(--font-size-xs);
}

/* ===================================
   MARKDOWN PAGE STYLES
   =================================== */

.markdown-page {
    background: var(--color-bg-primary);
}

.markdown-content {
    max-width: 700px;
    margin: 0 auto;
    padding: 8rem var(--spacing-xl) var(--spacing-3xl);
}

.markdown-content h1 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-primary);
}

.markdown-content h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.markdown-content h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.markdown-content p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.markdown-content ul,
.markdown-content ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
    color: var(--color-text-secondary);
}

.markdown-content li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
}

.markdown-content a {
    color: var(--color-accent);
    text-decoration: none;
}

.markdown-content a:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */

@media (max-width: 768px) {
    .hero {
        padding: 7rem 0 3rem;
    }

    .hero-title {
        font-size: var(--font-size-2xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-lg);
    }

    .hero-description {
        font-size: var(--font-size-base);
    }

    .hero-actions {
        flex-direction: column;
    }

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

    .nav-actions {
        gap: var(--spacing-sm);
    }

    .btn {
        padding: 0.5rem 0.875rem;
        font-size: var(--font-size-xs);
    }

    .footer-content {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-lg);
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .section-title {
        font-size: var(--font-size-xl);
    }

    .sandbox-card {
        padding: var(--spacing-xl);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .hero-title {
        font-size: var(--font-size-xl);
    }

    .timeline-card {
        padding: var(--spacing-lg);
    }
}