/* static/css/main.css */

/* =========================================
 * 0. VARIABLES
 * ========================================= */
:root {
    /* Colors */
    --bg-primary:           #0f172a;
    --bg-secondary:         #1e293b;
    --bg-tertiary:          #334155;
    --text-primary:         #f1f5f9;
    --text-secondary:       #cbd5e1;
    --text-muted:           #94a3b8;
    --text-nav:             #e2e8f0;
    --accent:               #60a5fa;
    --accent-hover:         #3b82f6;
    --border:               #334155;
    --danger:               #f87171;
    --success:              #4ade80;
    --warning:              #fbbf24;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;

    /* Spacing & Layout */
    --radius:                   8px;
    --shadow:                   0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --header-height:            4.5rem;
    --header-height-mobile:     4.25rem;
    --container-max:            886px;
    --container-wide-max:       1024px;
    --sticky-offset:            var(--header-height);

    /* Font Sizes */
    --fs-h1: clamp(2rem, 5vw, 2.5rem);
    --fs-h2: clamp(1.5rem, 4vw, 2rem);
}

/* =========================================
 * 1. RESET & BASE
 * ========================================= */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-padding-top: var(--sticky-offset);
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    min-height: 100vh;
    letter-spacing: 0.05em;
}

/* =========================================
 * 2. UTILITIES
 * ========================================= */
.container      { max-width: var(--container-max);      margin: 0 auto; padding: 0 1.5rem; }
.container-wide { max-width: var(--container-wide-max); margin: 0 auto; padding: 0 1.5rem; }

.skip-link { position: absolute; left: -9999px; z-index: 9999; }
.skip-link:focus {
    left: 0; top: 0;
    background: var(--accent); color: white;
    padding: 0.5rem 1rem; border-radius: var(--radius);
}

/* =========================================
 * 3. TYPOGRAPHY & LINKS
 * ========================================= */
a {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
    transition: color 0.2s ease, text-decoration-color 0.2s ease;
}
a:hover {
    color: var(--accent-hover);
    text-decoration-thickness: 2px;
    text-decoration-color: var(--accent-hover);
}
a:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 2px;
}

em { color: var(--accent); }

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
    color: var(--text-primary);
}
h1 { font-size: var(--fs-h1); letter-spacing: 0.02em; }
h2 { font-size: var(--fs-h2); letter-spacing: 0.01em; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

li::marker { color: var(--accent); }

p { margin-bottom: 1rem; color: var(--text-secondary); }

strong { color: #93c5fd; }

/* Inline code */
p code, li code, blockquote code {
/*    background: var(--bg-primary);*/
    color: var(--accent);
    padding: 0.15em 0.4em;
/*    border-radius: 4px;*/
    font-family: var(--font-mono);
    font-size: 0.85em;
/*    border: 1px solid #475569; */
    vertical-align: middle;
}

/* Code blocks */
pre {
    background: var(--bg-primary);
    padding: 1rem;
    border-radius: var(--radius);
    overflow-x: auto;
    margin-bottom: 1rem;
    border: 1px solid var(--border);
}
pre code {
    background: transparent;
    color: #93c5fd;
    font-family: var(--font-mono);
    font-size: 0.85em;
    vertical-align: middle;
}

/* =========================================
 * 4. LAYOUT — HEADER & NAV
 * ========================================= */
header {
    background: var(--bg-secondary);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 99;
    min-height: var(--header-height);
    transition: min-height 0.3s ease;
    border-bottom: 1px solid var(--border);
}

.header-center { display: flex; justify-content: center; }

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1.5rem;
    max-width: var(--container-wide-max);
    margin: 0 auto;
}

.nav-brand {
    display: flex; align-items: center; gap: 0.75rem;
    text-decoration: none; color: inherit;
    font-weight: bold; font-size: 1.25rem;
}
.nav-brand img { max-width: 40px; height: auto; display: block; }

.nav-links {
    display: flex; gap: 2rem;
    list-style: none; align-items: center;
}
.nav-links a {
    color: var(--text-nav); font-size: 0.9375rem; text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease;
}
.nav-links a:hover,
.nav-links a.active { color: var(--accent); border-bottom-color: var(--accent); }
.nav-links a.active { font-weight: 600; }

/* =========================================
 * 5. LAYOUT — BREADCRUMB
 * ========================================= */
.breadcrumb-wrapper {
    position: sticky;
    top: var(--header-height);
    z-index: 98;
    background-color: var(--bg-primary);
    width: 100%;
}

.breadcrumb {
    max-width: var(--container-wide-max);
    margin: 0 auto;
    padding: 0.5rem 1.5rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}
.breadcrumb a { color: var(--text-muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); text-decoration: underline; }
.breadcrumb span[aria-current="page"] { color: var(--text-primary); font-weight: 500; }
.breadcrumb-separator { margin: 0 0.25rem; color: var(--accent); }

/* =========================================
 * 6. COMPONENTS — CARD
 * ========================================= */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin: 1.2rem auto;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }

.card-title { font-size: 1.25rem; color: var(--text-secondary); margin-bottom: 0.5rem; }
.card-title a { color: var(--text-secondary); text-decoration: none; }
.card-title a:hover { color: var(--accent); }

.card-meta { font-size: 0.875rem; color: var(--text-muted); margin-bottom: 1rem; }

/* =========================================
 * 7. COMPONENTS — CONTENT AREA
 * ========================================= */
.content { line-height: 1.7; color: var(--text-secondary); }
.content h1,
.content h2,
.content h3 { margin-top: 2rem; margin-bottom: 1rem; color: var(--text-primary); }
.content p   { margin-bottom: 1.25rem; }
.content ul,
.content ol  { margin-bottom: 1rem; padding-left: 1.5rem; }
.content li  { margin-bottom: 0.5rem; }
.content blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 1rem; margin: 1rem 0;
    color: var(--text-muted); font-style: italic;
}

/* =========================================
 * 8. COMPONENTS — BUTTONS & ACTIONS
 * ========================================= */
.actions { display: flex; gap: 1rem; flex-wrap: wrap; margin: 2rem auto; }

.btn {
    display: inline-block;
    padding: 0.625rem 1.25rem;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius);
    font-weight: 500;
    transition: all 0.2s ease;
    cursor: pointer;
    border: 1px solid transparent;
}
.btn:hover { color: var(--accent); border-color: var(--accent); }

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

/* =========================================
 * 9. COMPONENTS — PROJECT SPECIFICS
 * ========================================= */
.project-meta { color: var(--text-muted); font-size: 0.875rem; margin-bottom: 1.5rem; }
.project-meta strong { color: var(--text-secondary); }

.project-featured-image {
    width: 100%; height: auto;
    border-radius: var(--radius);
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    display: block;
}

.project-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 1.5rem 0 2rem; }

.tag-badge {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid var(--border);
}
.tag-badge:hover { background-color: var(--accent); color: white; border-color: var(--accent); }

/* Write-ups list on project detail page */
.project-pages-section h2 { margin-bottom: 1rem; font-size: 1.5rem; }
.project-pages-list {
    list-style: none; padding: 0; margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
}
.project-pages-list li {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.project-pages-list li:hover {
    transform: translateY(-2px); box-shadow: var(--shadow); border-color: var(--accent);
}
.project-pages-list a {
    color: var(--text-primary); text-decoration: none;
    font-weight: 500; display: block;
}
.project-pages-list a:hover { color: var(--accent); }

/* Prev/next page navigation */
.page-navigation {
    display: flex; justify-content: space-between; align-items: center;
    margin-top: 3rem; padding-top: 2rem;
    border-top: 1px solid var(--border); gap: 1rem;
}
.page-nav-btn {
    display: inline-flex; align-items: center; gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    background-color: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    border-radius: var(--radius);
    text-decoration: none; font-weight: 500;
    transition: all 0.2s ease;
}
.page-nav-btn:hover {
    background-color: var(--bg-tertiary); color: var(--text-primary);
    border-color: var(--accent); transform: translateY(-1px);
}
.page-nav-btn.disabled { opacity: 0.5; pointer-events: none; cursor: not-allowed; }

/* =========================================
 * 10. COMPONENTS — HOMEPAGE
 * ========================================= */
.homepage-pages h2 { margin-bottom: 1.5rem; }

.homepage-intro .content table {
    margin-left: auto;
    margin-right: 1px;
}

/* =========================================
 * 11. TABLES
 * ========================================= */
.content table {
    width: auto; min-width: 300px;
    margin: 1rem 0 1.5rem;
    border-collapse: separate; border-spacing: 0;
    font-size: 0.95rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}
.content th,
.content td {
    padding: 0.75rem 1rem; text-align: left;
    border-bottom: 1px solid var(--border);
    border-right: 1px solid var(--border);
    overflow-wrap: break-word;
}
.content th {
    background-color: var(--bg-tertiary); color: var(--text-primary);
    font-weight: 600; text-transform: uppercase;
    font-size: 0.85rem; letter-spacing: 0.05em;
    border-bottom: 2px solid var(--border);
}
.content tr:last-child td  { border-bottom: none; }
.content th:last-child,
.content td:last-child     { border-right: none; }
.content tr:hover          { background-color: rgba(96, 165, 250, 0.05); }

/* =========================================
 * 12. FOOTER
 * ========================================= */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 2rem 0;
    margin-top: 1rem;
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.footer-content {
    display: flex; flex-wrap: wrap;
    justify-content: space-between; align-items: center;
    gap: 1.5rem;
}

.copyright { color: var(--text-secondary); font-size: 0.875rem; text-align: right; line-height: 1.5; }
.copyright p { margin-bottom: 0; }
.copyright p:last-child { margin-top: 0.25rem; }

.license { font-size: 0.8rem; margin-top: 0.25rem; }
.license svg { width: 16px; height: 16px; fill: currentColor; vertical-align: middle; margin-right: 0.25rem; }
.copyright .license a { color: var(--text-primary); font-weight: 500; text-decoration: none; }
.copyright .license a:hover { color: var(--accent); }

.contact-info { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.contact-item { display: flex; align-items: center; gap: 0.5rem; }
.contact-item a {
    color: var(--text-secondary); text-decoration: none; font-weight: 500;
    font-size: 0.875rem; transition: color 0.2s ease, transform 0.2s ease;
    display: inline-flex; align-items: center;
}
.contact-item a:hover { color: var(--accent); transform: translateY(-1px); }
.contact-item svg {
    width: 16px; height: 16px; fill: currentColor;
    vertical-align: middle; margin-right: 0.25rem; display: inline-block;
}

.separator { position: relative; padding-left: 1rem; margin-left: 0.75rem; }
.separator::before {
    content: "";
    position: absolute; left: 0; top: 50%; transform: translateY(-50%);
    width: 1px; height: 1.2em; background-color: var(--border);
}

/* =========================================
 * 13. RESPONSIVE
 * ========================================= */
@media (max-width: 768px) {
    /* Header & nav */
    header          { padding: 0.75rem 0; min-height: var(--header-height-mobile); }
    .nav            { padding: 0 0.5rem; }
    .nav-brand      { font-size: 1.1rem; }
    .nav-links      { gap: 1rem; font-size: 0.85rem; }

    /* Breadcrumb */
    .breadcrumb-wrapper { top: var(--header-height-mobile); }
    .breadcrumb {
        padding: 0.25rem 0.5rem;
        font-size: 0.8rem;
        white-space: nowrap;
        overflow-x: auto;
    }

    /* Typography */
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }

    /* Layout */
    .container      { padding: 0 1rem; }
    .container-wide { padding: 0 1rem; }
    .page-grid      { grid-template-columns: 1fr; }

    /* Actions & buttons */
    .actions                    { flex-direction: column; gap: 0.75rem; }
    .actions .btn,
    .homepage-pages .btn        { width: auto; text-align: center; margin-bottom: 0.5rem; }
    .actions .btn:last-child,
    .homepage-pages .btn:last-child { margin-bottom: 0; }

    /* Pagination */
    .page-navigation    { flex-direction: column-reverse; align-items: stretch; }
    .page-nav-btn       { width: 100%; justify-content: center; }
    .project-pages-list { grid-template-columns: 1fr; }

    /* Tables */
    .content table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        border: 1px solid var(--border);
        width: 100%;
        min-width: 100%;
    }
    .content th,
    .content td {
        width: 1%;
        white-space: nowrap;
        border-right: 1px solid var(--border) !important;
    }
    .content th:last-child,
    .content td:last-child { border-right: 1px solid var(--border) !important; }

    /* Footer */
    .footer-content { flex-direction: column; text-align: center; gap: 1rem; }
    .contact-info   { flex-direction: column; gap: 0.75rem; }
    .separator      { display: none; }
    .contact-item   { flex-direction: row; justify-content: center; }
    .copyright      { text-align: center; }
}

@media (max-width: 360px) {
    .breadcrumb-separator { display: none; }
    .breadcrumb           { white-space: normal; }
}

@media (prefers-reduced-motion: reduce) {
    .card,
    .btn,
    .page-nav-btn,
    .contact-item a,
    .project-pages-list li,
    a { transition: none !important; }

    .card:hover,
    .page-nav-btn:hover,
    .project-pages-list li:hover { transform: none; }
}