/* ============================================
   SpeedyAI Website - Layout Styles
   Header, Footer, Grid, Responsive
   ============================================ */

/* --- Header / Navigation --- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: background-color var(--transition-slow), box-shadow var(--transition);
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.header-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.header-logo:hover {
    color: var(--text-primary);
}

.header-logo img {
    height: 60px;
    width: auto;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.header-nav a {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    transition: color var(--transition), background-color var(--transition);
}

.header-nav a:hover,
.header-nav a.active {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

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

/* Theme Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

.theme-toggle:hover {
    color: var(--text-primary);
    border-color: var(--brand-primary);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
}

[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: 36px;
    height: 36px;
    padding: 8px;
    border: none;
    background: none;
    cursor: pointer;
}

.mobile-menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* Mobile Navigation */
.mobile-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    padding: var(--space-xl);
    z-index: 999;
    overflow-y: auto;
}

.mobile-nav.active {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.mobile-nav a {
    display: block;
    padding: var(--space-md);
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition);
}

.mobile-nav a:hover,
.mobile-nav a.active {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

/* --- Main Content --- */
.site-main {
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

/* --- Hero Section --- */
.hero {
    padding: var(--space-4xl) 0;
    text-align: center;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.hero-content {
    max-width: 720px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-md);
    background: var(--brand-primary-light);
    color: var(--brand-primary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-xl);
}

.hero h1 {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    margin-bottom: var(--space-lg);
    letter-spacing: -0.02em;
}

.hero h1 .text-gradient {
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

/* --- Sections --- */
.section {
    padding: var(--space-4xl) 0;
}

.section--alt {
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto var(--space-3xl);
}

.section-header h2 {
    margin-bottom: var(--space-md);
}

.section-header p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
}

/* --- Grid Layouts --- */
.grid {
    display: grid;
    gap: var(--space-xl);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* --- Feature Detail Layout --- */
.feature-detail {
    padding: var(--space-3xl) 0;
}

.feature-detail-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto var(--space-3xl);
}

.feature-detail-header .feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--brand-primary-light);
    color: var(--brand-primary);
    border-radius: var(--radius-lg);
    margin: 0 auto var(--space-lg);
}

.feature-detail-header .feature-icon svg {
    width: 28px;
    height: 28px;
}

.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--border-light);
}

.feature-list li:last-child {
    border-bottom: none;
}

.feature-list .check-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    color: var(--brand-primary);
    margin-top: 2px;
}

/* --- Footer --- */
.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.footer-brand p {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-top: var(--space-md);
    max-width: 280px;
}

.footer-col h4 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: var(--space-md);
}

.footer-col ul {
    list-style: none;
    padding: 0;
}

.footer-col li {
    margin-bottom: var(--space-sm);
}

.footer-col a {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    transition: color var(--transition);
}

.footer-col a:hover {
    color: var(--brand-primary);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border-color);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.footer-bottom a {
    color: var(--text-muted);
}

.footer-bottom a:hover {
    color: var(--brand-primary);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-xl); }
}

@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2.25rem;
        --font-size-4xl: 1.875rem;
        --font-size-3xl: 1.5rem;
    }

    .header-nav { display: none; }
    .mobile-menu-toggle { display: flex; }

    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }

    .hero { padding: var(--space-3xl) 0; }
    .section { padding: var(--space-3xl) 0; }

    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }
}

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

    .hero h1 {
        font-size: var(--font-size-3xl);
    }
}