/* ═══════════════════ DOCS HUB ═══════════════════ */
.docs-hub {
    max-width: 1200px;
    margin: 0 auto;
    padding: 6rem 2rem 4rem;
}
.docs-hub .docs-hero {
    text-align: center;
    margin-bottom: 3rem;
    border-bottom: none;
    padding-bottom: 0;
}
.docs-hub .docs-hero p {
    max-width: 600px;
    margin: 0 auto;
}
.docs-hub-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1.25rem;
    justify-content: center;
}
.docs-hub-card {
    flex: 0 1 calc(33.333% - 0.84rem);
    min-width: 280px;
    display: block;
    padding: 1.8rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}
.docs-hub-card:hover {
    background: var(--bg-elevated);
    transform: translateY(-3px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}
.docs-hub-card.cyan:hover    { border-color: var(--accent-cyan); }
.docs-hub-card.magenta:hover { border-color: var(--accent-magenta); }
.docs-hub-card.green:hover   { border-color: var(--accent-green); }
.docs-hub-card.orange:hover  { border-color: var(--accent-orange); }
.docs-hub-card.blue:hover    { border-color: var(--accent-blue); }
.docs-hub-card .feature-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    margin-bottom: 1rem;
}
.docs-hub-card .feature-title {
    font-family: var(--font-body);
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}
.docs-hub-card .feature-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* inactive cards */
.docs-hub-card.inactive {
    opacity: 0.4;
    pointer-events: none;
    filter: grayscale(0.5);
}
.docs-hub-card .coming-soon {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-top: 0.75rem;
}

/* ═══════════════════ DOCS INTERACTIVE LAYOUT (3-col) ═══════════════════ */
.docs-interactive {
    display: grid;
    grid-template-columns: 220px 1fr 420px;
    max-width: 1600px;
    margin: 0 auto;
    padding: 5.5rem 2rem 4rem;
    gap: 2rem;
    min-height: 100vh;
}

/* ═══════════════════ SIDEBAR ═══════════════════ */
.docs-sidebar {
    position: sticky;
    top: 80px;
    align-self: start;
    padding-top: 1rem;
}
.docs-sidebar-title {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 1rem;
}
.docs-sidebar ul {
    list-style: none;
}
.docs-sidebar li {
    margin-bottom: 0.15rem;
}
.docs-sidebar a {
    display: block;
    padding: 0.4rem 0.75rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.15s;
    border-left: 2px solid transparent;
}
.docs-sidebar a:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.03);
}
.docs-sidebar a.active {
    color: var(--accent-cyan);
    border-left-color: var(--accent-cyan);
    background: rgba(77, 216, 232, 0.05);
}

/* ═══════════════════ DOCS CONTENT ═══════════════════ */
.docs-content {
    min-width: 0;
    padding-bottom: 4rem;
}
.docs-hero {
    margin-bottom: 2rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--border);
}
.docs-hero h1 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 2.8rem);
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 0.75rem;
}
.docs-hero p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 600px;
}

.docs-section {
    padding: 0;
    margin-bottom: 2.5rem;
    scroll-margin-top: 80px;
}
.docs-section h2 {
    font-family: var(--font-display);
    font-size: 1.7rem;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}
.docs-section h3 {
    font-family: var(--font-body);
    font-size: 1.05rem;
    font-weight: 600;
    margin: 1.5rem 0 0.5rem;
    color: var(--text-primary);
}
.docs-section p {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.75;
    margin-bottom: 1rem;
    max-width: 720px;
}
.docs-section ul,
.docs-section ol {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.75;
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    max-width: 720px;
}
.docs-section li {
    margin-bottom: 0.35rem;
}
.docs-section code {
    font-family: var(--font-mono);
    font-size: 0.82em;
    background: rgba(255, 255, 255, 0.06);
    padding: 0.15em 0.4em;
    border-radius: 4px;
    color: var(--accent-cyan);
}

.docs-section .code-block {
    margin: 1.25rem 0;
    max-width: 720px;
}

/* ═══════════════════ DOCS TABLE ═══════════════════ */
.docs-table {
    width: 100%;
    max-width: 720px;
    border-collapse: collapse;
    margin: 1.25rem 0;
    font-size: 0.85rem;
}
.docs-table th {
    text-align: left;
    padding: 0.6rem 1rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    border-bottom: 1px solid var(--border);
    background: var(--bg-surface);
}
.docs-table td {
    padding: 0.6rem 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
}
.docs-table td:first-child {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--accent-cyan);
}

/* ═══════════════════ TIP / NOTE ═══════════════════ */
.tip {
    padding: 1rem 1.25rem;
    border-radius: 8px;
    border-left: 3px solid var(--accent-green);
    background: rgba(93, 232, 160, 0.04);
    margin: 1.25rem 0;
    max-width: 720px;
}
.tip-label {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--accent-green);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.4rem;
}
.tip p {
    margin-bottom: 0;
    font-size: 0.85rem;
}

/* ═══════════════════ STICKY VIEWER PANEL ═══════════════════ */
.docs-viewer-panel {
    position: sticky;
    top: 80px;
    align-self: start;
    height: calc(100vh - 100px);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--bg-card);
    overflow: hidden;
}
.docs-viewer-canvas {
    flex: 1;
    min-height: 300px;
    position: relative;
}
.docs-viewer-canvas canvas {
    width: 100%;
    height: 100%;
    display: block;
}
.docs-viewer-repl {
    border-top: 1px solid var(--border);
    background: var(--bg-surface);
    display: flex;
    flex-direction: column;
}
.docs-viewer-repl .repl-header {
    display: none;
}
.docs-viewer-repl .repl-output {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem 0.75rem 0;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-secondary);
}
.docs-viewer-repl .repl-input-row {
    display: flex;
    align-items: center;
    padding: 0 0.75rem;
    height: 36px;
    flex-shrink: 0;
}
.docs-viewer-repl .repl-prompt {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-dim);
    white-space: nowrap;
    margin-right: 0.5rem;
    user-select: none;
}
.docs-viewer-repl .repl-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    outline: none;
    padding: 0;
    height: 100%;
}
.docs-viewer-repl .repl-input::placeholder {
    color: var(--text-dim);
}

/* ═══════════════════ CLICKABLE INLINE COMMANDS ═══════════════════ */
.cmd-run {
    display: inline-flex;
    align-items: center;
    gap: 0.3em;
    font-family: var(--font-mono);
    font-size: 0.82em;
    background: rgba(77, 216, 232, 0.08);
    border: 1px solid rgba(77, 216, 232, 0.25);
    color: var(--accent-cyan);
    padding: 0.15em 0.5em;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.15s;
}
.cmd-run::after {
    content: "▶";
    font-size: 0.65em;
    opacity: 0.6;
}
.cmd-run:hover {
    background: rgba(77, 216, 232, 0.15);
    border-color: rgba(77, 216, 232, 0.5);
    box-shadow: 0 0 8px rgba(77, 216, 232, 0.15);
}
.cmd-run.toggled {
    background: rgba(77, 216, 232, 0.18);
    border-color: rgba(77, 216, 232, 0.5);
}
.cmd-run.toggled::after {
    content: "⏸";
}
.cmd-run.flash {
    background: rgba(77, 216, 232, 0.3);
    border-color: var(--accent-cyan);
    box-shadow: 0 0 12px rgba(77, 216, 232, 0.3);
}

/* ═══════════════════ EXTERNAL LINKS ═══════════════════ */
.docs-section a.ext-link {
    color: var(--accent-cyan);
    text-decoration: underline;
    text-underline-offset: 2px;
}
.docs-section a.ext-link::after {
    content: " ↗";
    font-size: 0.8em;
}
.docs-section a.ext-link:hover {
    color: #7ae4f0;
}

/* ═══════════════════ PDB HIGHLIGHT ═══════════════════ */
.pdb-highlight {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    line-height: 1.6;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem 1.25rem;
    overflow-x: auto;
    margin: 1.25rem 0;
    max-width: 720px;
}
.pdb-highlight .pdb-record  { color: var(--accent-magenta); }
.pdb-highlight .pdb-serial  { color: var(--text-dim); }
.pdb-highlight .pdb-name    { color: var(--accent-cyan); }
.pdb-highlight .pdb-resname { color: var(--accent-green); }
.pdb-highlight .pdb-chain   { color: var(--accent-orange); }
.pdb-highlight .pdb-resseq  { color: var(--text-secondary); }
.pdb-highlight .pdb-coord   { color: var(--text-primary); }
.pdb-highlight .pdb-bfactor { color: var(--text-dim); }

/* ═══════════════════ SPA DOC PAGES ═══════════════════ */
.doc-page {
    display: none;
}
.doc-page:first-child {
    display: block;
}
.doc-page-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}
.doc-page-nav button {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.85rem;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s;
    min-width: 160px;
}
.doc-page-nav button:hover {
    color: var(--text-primary);
    border-color: var(--accent-cyan);
    background: rgba(77, 216, 232, 0.05);
}
.doc-page-nav button[data-nav="prev"] {
    text-align: left;
}
.doc-page-nav button[data-nav="next"] {
    text-align: right;
}
.page-counter {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-dim);
    letter-spacing: 0.05em;
}

/* inactive sidebar links */
.docs-sidebar a.inactive {
    color: var(--text-dim);
    pointer-events: none;
}

/* ═══════════════════ NOTE BLOCK ═══════════════════ */
.docs-note {
    margin: 1.5rem 0;
    padding: 1rem 1.25rem;
    border-left: 3px solid var(--accent-cyan);
    border-radius: 0 8px 8px 0;
    background: rgba(77, 216, 232, 0.06);
}
.docs-note-title {
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-cyan);
    margin-bottom: 0.4rem;
}
.docs-note p {
    margin: 0;
}

/* ═══════════════════ RESPONSIVE ═══════════════════ */
@media (max-width: 1200px) {
    .docs-interactive {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    .docs-interactive .docs-sidebar {
        display: none;
    }
    .docs-viewer-panel {
        position: static;
        height: 500px;
        order: -1;
    }
}
@media (max-width: 900px) {
    .docs-sidebar {
        position: static;
        border-bottom: 1px solid var(--border);
        padding-bottom: 1.5rem;
    }
    .docs-viewer-panel {
        height: 400px;
    }
    .docs-hub-card {
        flex: 0 1 100%;
    }
}