/*
 * layout.css
 * Page-level structural layout: containers, sections, navbar, hero, footer, responsive grid.
 */

/* ==========================================================================
   Container & Section
   ========================================================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-wide {
    max-width: 1400px;
}

.section {
    padding: var(--spacing-4xl) 0;
    position: relative;
}

.dark-band {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

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

/* ==========================================================================
   Background Effects
   ========================================================================== */
.background-grid {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100vh;
    background-size: 50px 50px;
    background-image:
        linear-gradient(to right,  rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255,255,255,0.03) 1px, transparent 1px);
    mask-image: linear-gradient(to bottom, black 40%, transparent 100%);
    -webkit-mask-image: linear-gradient(to bottom, black 40%, transparent 100%);
    z-index: -2;
    pointer-events: none;
}

/* ==========================================================================
   Navbar
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    transition: background 0.3s ease, backdrop-filter 0.3s ease;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

/* Applied via JS classList.toggle — keeps presentation in CSS, not inline styles */
.navbar.scrolled {
    background: rgba(10, 10, 12, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.logo-icon {
    color: var(--accent-blue);
    width: 24px;
    height: 24px;
    display: inline-block;
    flex-shrink: 0;
}

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

.nav-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.nav-link:hover { color: var(--color-text-primary); }

.nav-link-active {
    color: var(--color-text-primary) !important;
    font-weight: 600;
}

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

.github-stars {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: var(--radius-pill);
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.github-stars:hover { background: rgba(255,255,255,0.1); }

.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    width: 24px; height: 24px;
    position: relative;
}

.mobile-menu-btn span {
    display: block;
    width: 100%; height: 2px;
    background: var(--color-text-primary);
    position: absolute;
    left: 0;
    transition: 0.3s;
}

.mobile-menu-btn span:nth-child(1) { top: 4px; }
.mobile-menu-btn span:nth-child(2) { top: 11px; }
.mobile-menu-btn span:nth-child(3) { top: 18px; }

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 100px;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: center;
}

.hero-title    { margin-bottom: var(--spacing-md); }
.hero-subtitle { margin-bottom: var(--spacing-xl); max-width: 90%; }

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

.hero-tech-stack {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: var(--spacing-lg);
}

.hero-tech-stack p { margin-bottom: var(--spacing-md); }

.tech-logos { display: flex; flex-wrap: wrap; gap: var(--spacing-sm); }

.tech-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
}

/* ==========================================================================
   Grid Utilities
   ========================================================================== */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-2xl);
}

@media (max-width: 900px) {
    .grid-2 {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

@media (max-width: 768px) {
    .grid-3 {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

/* ==========================================================================
   Open Source Section
   ========================================================================== */
.open-source-container { max-width: 900px; margin: 0 auto; }

.github-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-2xl);
    margin: var(--spacing-3xl) 0;
}

.stat-card {
    text-align: center;
    padding: var(--spacing-xl) !important;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
    border-color: rgba(59, 130, 246, 0.35);
}

.stat-icon-wrapper {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-pill);
    background: rgba(139, 92, 246, 0.1);
    color: var(--accent-purple);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    transition: background 0.3s, color 0.3s, transform 0.3s;
}

.stat-card:hover .stat-icon-wrapper {
    background: var(--gradient-primary);
    color: #fff;
    transform: scale(1.1);
}

.stat-svg {
    width: 20px;
    height: 20px;
    stroke-width: 2.2;
}

.stat-heading { margin-bottom: var(--spacing-sm); }

[data-theme="light"] .stat-icon-wrapper {
    background: rgba(139, 92, 246, 0.08);
}

.open-source-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    background: var(--color-primary);
    padding: var(--spacing-4xl) 0 var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-3xl);
}

.footer-links h4 { margin-bottom: var(--spacing-lg); }

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

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

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 992px) {
    .hero-container { grid-template-columns: 1fr; }
    .hero-content   { text-align: center; }
    .hero-subtitle  { margin: 0 auto var(--spacing-xl); }
    .hero-actions   { justify-content: center; }
    .tech-logos     { justify-content: center; }
    .grid-3         { grid-template-columns: 1fr; }
    .footer-grid    { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-links, .nav-actions .btn { display: none; }
    .mobile-menu-btn              { display: block; }

    .github-stats  { grid-template-columns: 1fr; gap: var(--spacing-lg); }
    .stat-divider  { width: 100%; height: 1px; }
    .footer-grid   { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Vertical Timeline Component
   ========================================================================== */
.timeline-section {
    position: relative;
    overflow: hidden;
    border-top: 1px solid var(--color-border);
}

.timeline-container {
    position: relative;
    max-width: 900px;
    margin: var(--spacing-3xl) auto 0;
    padding-left: 60px;
}

.timeline-progress-line {
    position: absolute;
    left: 19px;
    top: 24px;
    bottom: 24px;
    width: 2px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
    overflow: hidden;
}

.timeline-progress-fill {
    width: 100%;
    height: 0%;
    background: linear-gradient(to bottom, var(--accent-blue), var(--accent-purple), var(--accent-red));
    border-radius: inherit;
    transition: height 0.1s ease-out;
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-4xl);
}

.timeline-bullet-wrapper {
    position: absolute;
    left: -60px;
    top: 20px;
    width: 40px;
    display: flex;
    justify-content: center;
}

.timeline-bullet {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 2px solid rgba(255, 255, 255, 0.15);
    z-index: 5;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.timeline-item.active .timeline-bullet {
    border-color: var(--accent-purple);
    background: var(--accent-purple);
    box-shadow: 0 0 12px var(--accent-purple);
    transform: scale(1.2);
}

.timeline-content {
    padding: var(--spacing-xl);
    transform: translateY(30px);
    opacity: 0;
    transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.timeline-item.visible .timeline-content {
    transform: translateY(0);
    opacity: 1;
}

.timeline-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.timeline-date {
    font-size: 14px;
    font-weight: 400;
    color: var(--color-text-secondary);
    margin-left: 8px;
}

.timeline-media {
    margin-top: var(--spacing-lg);
    border-radius: var(--radius-md);
    overflow: hidden;
    max-width: 480px;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.timeline-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.timeline-content:hover .timeline-img {
    transform: scale(1.04);
}

@media (max-width: 768px) {
    .timeline-container {
        padding-left: 40px;
    }
    .timeline-progress-line {
        left: 9px;
    }
    .timeline-bullet-wrapper {
        left: -40px;
        width: 30px;
    }
}

/* ==========================================================================
   Light Mode Layout Overrides
   ========================================================================== */

[data-theme="light"] .navbar {
    border-bottom-color: rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .navbar.scrolled {
    background: rgba(240, 242, 247, 0.88);
}

[data-theme="light"] .hero-tech-stack {
    border-top-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .stat-divider {
    background: rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .timeline-progress-line {
    background: rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .timeline-bullet {
    background: var(--color-surface);
    border-color: rgba(0, 0, 0, 0.2);
}

[data-theme="light"] .timeline-media {
    border-color: rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .timeline-section {
    border-top-color: var(--color-border);
}

[data-theme="light"] .dark-band {
    background-color: var(--color-surface);
    border-top-color: var(--color-border);
    border-bottom-color: var(--color-border);
}