/* =========================================================
   Course Creator Skills – Shared Design System
   Matches the org-manager docs design language exactly.
   ========================================================= */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* =========================================================
   1. CSS VARIABLES
   ========================================================= */
:root {
    --bg-primary:       #ffffff;
    --bg-secondary:     #f8fafc;
    --bg-tertiary:      #f1f5f9;
    --text-primary:     #0f172a;
    --text-secondary:   #475569;
    --text-muted:       #94a3b8;
    --border-color:     #e2e8f0;
    --accent-primary:   #3b82f6;
    --accent-secondary: #8b5cf6;
    --accent-success:   #10b981;
    --accent-warning:   #f59e0b;
    --accent-danger:    #ef4444;
    --code-bg:          #1e293b;
    --sidebar-width:    260px;

    /* Stage badge palette */
    --stage-1: #3b82f6;
    --stage-2: #8b5cf6;
    --stage-3: #10b981;
    --stage-4: #f59e0b;
    --stage-5: #ef4444;
    --stage-6: #06b6d4;
    --stage-7: #84cc16;
    --stage-triad: #ec4899;
    --stage-orch: #f97316;
}

[data-theme="dark"] {
    --bg-primary:       #0f172a;
    --bg-secondary:     #1e293b;
    --bg-tertiary:      #334155;
    --text-primary:     #f8fafc;
    --text-secondary:   #cbd5e1;
    --text-muted:       #64748b;
    --border-color:     #334155;
    --code-bg:          #0f172a;
}

/* =========================================================
   2. RESET & BODY
   ========================================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

/* =========================================================
   3. HEADER – fixed 60px
   ========================================================= */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 24px;
    z-index: 100;
    gap: 12px;
}

.header h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-primary);
    white-space: nowrap;
}

.header-actions {
    margin-left: auto;
    display: flex;
    gap: 12px;
    align-items: center;
}

.theme-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 12px;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 14px;
    font-family: 'Inter', sans-serif;
    transition: background 0.2s, border-color 0.2s;
}

.theme-toggle:hover {
    background: var(--border-color);
}

/* =========================================================
   4. SIDEBAR – fixed 260px
   ========================================================= */
.sidebar {
    position: fixed;
    top: 60px;
    left: 0;
    width: var(--sidebar-width);
    height: calc(100vh - 60px);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: 20px 0;
    overflow-y: auto;
    z-index: 90;
}

.nav-section-label {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 16px 24px 6px;
}

.nav-item {
    display: block;
    padding: 10px 24px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
    border-right: 3px solid transparent;
}

.nav-item:hover {
    color: var(--accent-primary);
    background: var(--bg-tertiary);
}

.nav-item.sub {
    padding-left: 40px;
    font-size: 13px;
    font-weight: 400;
}

.nav-item.active {
    color: var(--accent-primary);
    border-right-color: var(--accent-primary);
    background: var(--bg-tertiary);
}

/* =========================================================
   5. MAIN CONTENT
   ========================================================= */
.main {
    margin-left: var(--sidebar-width);
    margin-top: 60px;
    padding: 40px;
    max-width: 1000px;
}

/* =========================================================
   6. TYPOGRAPHY
   ========================================================= */
h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 40px 0 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent-primary);
    color: var(--text-primary);
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 30px 0 15px;
    color: var(--text-primary);
}

h4 {
    font-size: 1rem;
    font-weight: 600;
    margin: 20px 0 10px;
    color: var(--text-primary);
}

p {
    margin: 10px 0;
    color: var(--text-secondary);
}

a {
    color: var(--accent-primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

ul, ol {
    margin: 10px 0 10px 24px;
    color: var(--text-secondary);
}

li {
    margin: 4px 0;
}

/* =========================================================
   7. CARD COMPONENT
   ========================================================= */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    margin: 20px 0;
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.card-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* =========================================================
   8. TABLES
   ========================================================= */
.table-wrapper {
    overflow-x: auto;
    margin: 20px 0;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

thead th {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-weight: 600;
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

tbody td {
    padding: 11px 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    vertical-align: middle;
}

tbody tr:last-child td {
    border-bottom: none;
}

tbody tr:nth-child(even) {
    background: var(--bg-secondary);
}

tbody tr:hover {
    background: var(--bg-tertiary);
}

/* =========================================================
   9. CODE BLOCKS
   ========================================================= */
pre {
    position: relative;
    background: var(--code-bg);
    border-radius: 8px;
    padding: 20px 20px 20px 20px;
    overflow-x: auto;
    margin: 16px 0;
}

pre code {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 13px;
    line-height: 1.65;
    color: #e2e8f0;
}

code {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 13px;
}

:not(pre) > code {
    background: var(--bg-tertiary);
    color: var(--accent-primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 12.5px;
}

.code-copy {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    color: #94a3b8;
    font-size: 12px;
    padding: 4px 10px;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    transition: background 0.2s, color 0.2s;
}

.code-copy:hover {
    background: rgba(255, 255, 255, 0.2);
    color: #f8fafc;
}

.code-copy.copied {
    color: #10b981;
    border-color: #10b981;
}

/* =========================================================
   10. HERO / QUICK-START GRADIENT BANNER
   ========================================================= */
.hero {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border-radius: 12px;
    padding: 40px 36px;
    margin: 0 0 40px;
}

.hero h1 {
    font-size: 2rem;
    font-weight: 700;
    color: white;
    margin-bottom: 12px;
}

.hero p {
    color: rgba(255, 255, 255, 0.88);
    font-size: 1.05rem;
    margin: 0;
    max-width: 680px;
}

.hero h2 {
    color: white;
    border-bottom-color: rgba(255, 255, 255, 0.3);
    margin-top: 0;
}

.hero pre {
    background: rgba(0, 0, 0, 0.3);
}

/* =========================================================
   11. BREADCRUMBS
   ========================================================= */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 28px;
}

.breadcrumb a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

.breadcrumb a:hover {
    color: var(--accent-primary);
}

.breadcrumb .sep {
    color: var(--text-muted);
    font-size: 11px;
    margin: 0 2px;
}

.breadcrumb .current {
    color: var(--text-secondary);
    font-weight: 500;
}

/* =========================================================
   12. FOOTER
   ========================================================= */
.footer {
    margin-top: 60px;
    padding: 30px;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 14px;
}

/* =========================================================
   13. PAGE NAVIGATION (prev/next)
   ========================================================= */
.page-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 60px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    gap: 16px;
}

.page-nav-link {
    display: flex;
    flex-direction: column;
    gap: 4px;
    text-decoration: none;
    padding: 16px 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    transition: border-color 0.2s, transform 0.2s;
    min-width: 180px;
}

.page-nav-link:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    text-decoration: none;
}

.page-nav-link.next {
    text-align: right;
    margin-left: auto;
}

.page-nav-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
}

.page-nav-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-primary);
}

/* =========================================================
   14. ARCHITECTURE DIAGRAM
   ========================================================= */
.diagram-container {
    margin: 24px 0;
    padding: 28px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow-x: auto;
}

.diagram-flow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    min-width: 560px;
}

.diagram-box {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 22px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
    white-space: nowrap;
    min-width: 220px;
    text-align: center;
}

.diagram-box.source {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border: none;
}

.diagram-box.orchestrator {
    background: var(--bg-tertiary);
    border: 2px solid var(--accent-primary);
    color: var(--text-primary);
}

.diagram-box.output {
    background: linear-gradient(135deg, var(--accent-success), #059669);
    color: white;
    border: none;
}

.diagram-arrow {
    width: 2px;
    height: 24px;
    background: var(--border-color);
    position: relative;
    margin: 0 auto;
}

.diagram-arrow::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 8px solid var(--border-color);
}

.diagram-stages {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 20px 24px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    width: 100%;
    max-width: 560px;
}

.diagram-stage-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.diagram-stage-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    font-size: 11px;
    font-weight: 700;
    flex-shrink: 0;
    color: white;
}

.diagram-stage-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    flex: 1;
}

.diagram-stage-skills {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.diagram-skill-chip {
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 4px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
}

/* =========================================================
   15. PIPELINE STAGE CARDS
   ========================================================= */
.stage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
    margin: 20px 0;
}

.stage-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
    overflow: hidden;
}

.stage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
}

.stage-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

.stage-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.stage-number-circle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 14px;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
}

.stage-card-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

.stage-card-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Per-stage accent colors */
.stage-1 .stage-number-circle, .stage-1.stage-card::before { background: var(--stage-1); }
.stage-2 .stage-number-circle, .stage-2.stage-card::before { background: var(--stage-2); }
.stage-3 .stage-number-circle, .stage-3.stage-card::before { background: var(--stage-3); }
.stage-4 .stage-number-circle, .stage-4.stage-card::before { background: var(--stage-4); }
.stage-5 .stage-number-circle, .stage-5.stage-card::before { background: var(--stage-5); }
.stage-6 .stage-number-circle, .stage-6.stage-card::before { background: var(--stage-6); }
.stage-7 .stage-number-circle, .stage-7.stage-card::before { background: var(--stage-7); }
.stage-triad .stage-number-circle, .stage-triad.stage-card::before { background: var(--stage-triad); }
.stage-orch .stage-number-circle, .stage-orch.stage-card::before { background: var(--stage-orch); }

/* =========================================================
   16. BADGE / PILL STYLES
   ========================================================= */
.badge {
    display: inline-flex;
    align-items: center;
    font-size: 11px;
    font-weight: 600;
    padding: 3px 9px;
    border-radius: 20px;
    white-space: nowrap;
    vertical-align: middle;
}

.badge-blue   { background: rgba(59,  130, 246, 0.15); color: #3b82f6; }
.badge-purple { background: rgba(139,  92, 246, 0.15); color: #8b5cf6; }
.badge-green  { background: rgba( 16, 185, 129, 0.15); color: #10b981; }
.badge-yellow { background: rgba(245, 158,  11, 0.15); color: #b45309; }
.badge-red    { background: rgba(239,  68,  68, 0.15); color: #ef4444; }
.badge-cyan   { background: rgba(  6, 182, 212, 0.15); color: #06b6d4; }
.badge-lime   { background: rgba(132, 204,  22, 0.15); color: #65a30d; }
.badge-pink   { background: rgba(236,  72, 153, 0.15); color: #ec4899; }
.badge-orange { background: rgba(249, 115,  22, 0.15); color: #ea580c; }
.badge-gray   { background: var(--bg-tertiary); color: var(--text-secondary); }

/* Badge that matches stage colors */
.stage-badge-1 { background: rgba(59,  130, 246, 0.15); color: #3b82f6; }
.stage-badge-2 { background: rgba(139,  92, 246, 0.15); color: #8b5cf6; }
.stage-badge-3 { background: rgba( 16, 185, 129, 0.15); color: #10b981; }
.stage-badge-4 { background: rgba(245, 158,  11, 0.15); color: #b45309; }
.stage-badge-5 { background: rgba(239,  68,  68, 0.15); color: #ef4444; }
.stage-badge-6 { background: rgba(  6, 182, 212, 0.15); color: #06b6d4; }
.stage-badge-7 { background: rgba(132, 204,  22, 0.15); color: #65a30d; }
.stage-badge-T { background: rgba(236,  72, 153, 0.15); color: #ec4899; }
.stage-badge-O { background: rgba(249, 115,  22, 0.15); color: #ea580c; }

/* =========================================================
   17. ALERT / NOTE BOXES
   ========================================================= */
.note, .warning, .tip {
    padding: 14px 18px;
    border-radius: 8px;
    margin: 16px 0;
    font-size: 14px;
    color: var(--text-secondary);
    border-left: 4px solid;
    background: var(--bg-secondary);
    line-height: 1.6;
}

.note {
    border-left-color: var(--accent-primary);
    background: rgba(59, 130, 246, 0.06);
}

.warning {
    border-left-color: var(--accent-warning);
    background: rgba(245, 158, 11, 0.06);
}

.tip {
    border-left-color: var(--accent-success);
    background: rgba(16, 185, 129, 0.06);
}

.note strong, .warning strong, .tip strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: 4px;
}

/* =========================================================
   18. FEATURE GRID
   ========================================================= */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
    margin: 20px 0;
}

.feature-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 20px;
    transition: transform 0.2s, border-color 0.2s;
}

.feature-item:hover {
    transform: translateY(-2px);
    border-color: var(--accent-primary);
}

.feature-icon {
    font-size: 24px;
    margin-bottom: 10px;
    display: block;
}

.feature-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.feature-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* =========================================================
   19. TAG / PILL STYLES
   ========================================================= */
.tag {
    display: inline-flex;
    align-items: center;
    font-size: 12px;
    font-weight: 500;
    padding: 4px 10px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    margin: 2px;
    white-space: nowrap;
}

.tag-group {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: 12px 0;
}

/* =========================================================
   20. QUICK-LINK CARDS (4-up grid)
   ========================================================= */
.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin: 20px 0;
}

.link-card {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 22px 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    text-decoration: none;
    transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.link-card:hover {
    transform: translateY(-3px);
    border-color: var(--accent-primary);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.12);
    text-decoration: none;
}

.link-card-icon {
    font-size: 26px;
}

.link-card-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--accent-primary);
}

.link-card-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* =========================================================
   RESPONSIVE – hide sidebar on mobile
   ========================================================= */
@media (max-width: 900px) {
    .sidebar {
        display: none;
    }

    .main {
        margin-left: 0;
        padding: 24px;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .feature-grid,
    .stage-grid,
    .link-grid {
        grid-template-columns: 1fr;
    }

    .page-nav {
        flex-direction: column;
    }

    .page-nav-link {
        width: 100%;
        min-width: unset;
    }

    .page-nav-link.next {
        text-align: left;
        margin-left: 0;
    }

    .diagram-flow {
        min-width: 320px;
    }
}