/* ---------- Design tokens ---------- */
:root {
    --fad-bg: #f5f6fa;
    --fad-surface: #ffffff;
    --fad-surface-alt: #eef1f7;
    --fad-border: #e1e5ee;
    --fad-text: #1a2138;
    --fad-text-muted: #5b6478;
    --fad-primary: #24408f;
    --fad-primary-dark: #16295c;
    --fad-primary-soft: #e8edfb;
    --fad-accent: #0d9c98;
    --fad-get: #2563eb;
    --fad-get-soft: #e5edff;
    --fad-post: #158f5c;
    --fad-post-soft: #e2f6ec;
    --fad-put: #a6690c;
    --fad-put-soft: #fbeed9;
    --fad-delete: #c13b3b;
    --fad-delete-soft: #fbe6e6;
    --fad-code-bg: #101726;
    --fad-code-text: #e6eaf2;
    --fad-shadow: 0 1px 2px rgba(20, 27, 48, 0.06), 0 6px 20px rgba(20, 27, 48, 0.06);
    --fad-font-display: "Poppins", "Segoe UI", Arial, sans-serif;
    --fad-font-body: "Open Sans", "Segoe UI", Arial, sans-serif;
    --fad-font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
    :root {
        --fad-bg: #0d1117;
        --fad-surface: #161b22;
        --fad-surface-alt: #1b222c;
        --fad-border: #2a323d;
        --fad-text: #e7eaf2;
        --fad-text-muted: #9aa4b8;
        --fad-primary: #7c9ceb;
        --fad-primary-dark: #a9c0f5;
        --fad-primary-soft: #1d2a49;
        --fad-accent: #3fd0cb;
        --fad-get: #6fa1ff;
        --fad-get-soft: #16233f;
        --fad-post: #4fd39a;
        --fad-post-soft: #122a20;
        --fad-put: #e5ab4f;
        --fad-put-soft: #2c2313;
        --fad-delete: #f0857f;
        --fad-delete-soft: #2f1717;
        --fad-code-bg: #05070c;
        --fad-code-text: #d8e0ee;
        --fad-shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.35);
    }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    margin: 0;
    background: var(--fad-bg);
    color: var(--fad-text);
    font-family: var(--fad-font-body);
    font-size: 15px;
    line-height: 1.6;
}

h1, h2, h3, h4 { font-family: var(--fad-font-display); font-weight: 600; color: var(--fad-text); text-wrap: balance; }

.fad-skip-link {
    position: absolute; left: -999px; top: 0; background: var(--fad-primary); color: #fff;
    padding: 0.5rem 1rem; z-index: 200;
}
.fad-skip-link:focus { left: 0; }

/* ---------- Top bar ---------- */

.fad-topbar {
    position: sticky; top: 0; z-index: 100;
    display: flex; align-items: center; gap: 1rem;
    background: var(--fad-surface); border-bottom: 1px solid var(--fad-border);
    padding: 0.65rem 1.25rem; box-shadow: var(--fad-shadow);
}

.fad-nav-toggle {
    display: none; flex-direction: column; justify-content: center; gap: 4px;
    width: 34px; height: 34px; background: none; border: 1px solid var(--fad-border);
    border-radius: 8px; cursor: pointer; flex: none;
}
.fad-nav-toggle span { width: 16px; height: 2px; background: var(--fad-text); margin: 0 auto; }

.fad-brand { display: flex; align-items: center; gap: 0.5rem; font-family: var(--fad-font-display); font-size: 1.05rem; white-space: nowrap; }
.fad-brand-logo { width: 26px; height: 26px; color: var(--fad-primary); flex: none; }
.fad-brand-mark { font-weight: 700; color: var(--fad-primary); }
.fad-brand-rest { font-weight: 500; color: var(--fad-text-muted); }

.fad-token-bar {
    margin-left: auto; display: flex; align-items: center; gap: 0.5rem;
    background: var(--fad-surface-alt); border: 1px solid var(--fad-border);
    border-radius: 10px; padding: 0.35rem 0.5rem 0.35rem 0.75rem;
    flex: 1 1 480px; max-width: 620px; min-width: 0;
}
.fad-token-label { font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; color: var(--fad-text-muted); flex: none; }
.fad-token-input {
    flex: 1 1 auto; min-width: 0; border: none; background: transparent; color: var(--fad-text);
    font-family: var(--fad-font-mono); font-size: 0.82rem; padding: 0.3rem 0.25rem; outline: none;
}
.fad-token-btn {
    flex: none; border: 1px solid var(--fad-border); background: var(--fad-surface); color: var(--fad-text-muted);
    border-radius: 7px; padding: 0.3rem 0.6rem; font-size: 0.78rem; cursor: pointer;
}
.fad-token-btn:hover { color: var(--fad-delete); border-color: var(--fad-delete); }
.fad-token-status {
    flex: none; font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.03em;
    color: var(--fad-text-muted); padding: 0.15rem 0.55rem; border-radius: 999px; background: var(--fad-surface);
}
.fad-token-status-ready { color: var(--fad-post); background: var(--fad-post-soft); }

/* ---------- Shell layout ---------- */

.fad-shell { display: flex; align-items: flex-start; }

.fad-sidebar {
    position: sticky; top: 61px; align-self: flex-start;
    width: 280px; flex: none; height: calc(100vh - 61px);
    background: var(--fad-surface); border-right: 1px solid var(--fad-border);
    overflow-y: auto;
}
.fad-sidebar-scroll { padding: 1.25rem 0.75rem 3rem; }

/* Subject groups over folding sections (1 Oct 2026). */
.fad-nav-section {
    font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em;
    color: var(--fad-text-muted); padding: 1.1rem 0.6rem 0.4rem;
}
.fad-nav-section:first-child { padding-top: 0.2rem; }
.fad-nav-group { margin-bottom: 0.15rem; }
.fad-nav-heading {
    display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; cursor: pointer;
    font-family: var(--fad-font-display); font-weight: 600; font-size: 0.9rem; color: var(--fad-text);
    padding: 0.42rem 0.6rem; border-radius: 8px; list-style: none;
}
.fad-nav-heading::-webkit-details-marker { display: none; }
.fad-nav-heading::before {
    content: ''; width: 0.4rem; height: 0.4rem; flex: 0 0 auto; margin-right: 0.15rem;
    border-right: 2px solid var(--fad-text-muted); border-bottom: 2px solid var(--fad-text-muted);
    transform: rotate(-45deg); transition: transform 0.15s ease;
}
.fad-nav-group[open] > .fad-nav-heading::before { transform: rotate(45deg); }
.fad-nav-heading:hover { background: var(--fad-surface-alt); }
.fad-nav-group[open] > .fad-nav-heading { color: var(--fad-primary); }
.fad-nav-heading:focus-visible { outline: 2px solid var(--fad-primary); outline-offset: 1px; }
.fad-nav-count {
    margin-left: auto; font-size: 0.72rem; font-weight: 600; color: var(--fad-text-muted);
    background: var(--fad-surface-alt); border-radius: 999px; padding: 0.05rem 0.5rem;
}
.fad-nav-group .fad-nav-list { padding: 0.15rem 0 0.5rem 0.9rem; }
.fad-nav-list { list-style: none; margin: 0; padding: 0; }
.fad-nav-link {
    display: flex; align-items: center; gap: 0.5rem; text-decoration: none; color: var(--fad-text-muted);
    font-size: 0.86rem; padding: 0.4rem 0.6rem; border-radius: 8px;
}
.fad-nav-link:hover { background: var(--fad-surface-alt); color: var(--fad-text); }
.fad-nav-link-active { background: var(--fad-primary-soft); color: var(--fad-primary); font-weight: 600; }

.fad-main { flex: 1 1 auto; min-width: 0; padding: 2rem 2.5rem 6rem; max-width: 980px; }

/* ---------- Hero ---------- */

.fad-hero { margin-bottom: 2.5rem; }
.fad-hero h1 { font-size: 1.9rem; margin: 0 0 0.6rem; }
.fad-hero > p { color: var(--fad-text-muted); max-width: 62ch; margin: 0 0 1rem; }
.fad-hero-steps { margin: 0; padding-left: 1.2rem; max-width: 62ch; color: var(--fad-text); }
.fad-hero-steps li { margin-bottom: 0.35rem; }

/* ---------- Category / cards ---------- */

.fad-category { margin-bottom: 2.5rem; padding-top: 0.5rem; scroll-margin-top: 70px; }
.fad-category-group {
    font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em;
    color: var(--fad-primary); margin-bottom: 0.2rem;
}
.fad-category-title {
    font-size: 1.35rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--fad-border); margin-bottom: 0.5rem;
}
.fad-category-intro { color: var(--fad-text-muted); max-width: 70ch; margin: 0 0 1.25rem; }

.fad-card {
    background: var(--fad-surface); border: 1px solid var(--fad-border); border-radius: 14px;
    padding: 1.4rem 1.5rem; margin-bottom: 1.5rem; box-shadow: var(--fad-shadow); scroll-margin-top: 80px;
}

.fad-card-header { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem; margin-bottom: 0.4rem; }
.fad-card-title-row { display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; }
.fad-card-path { font-family: var(--fad-font-mono); font-size: 0.88rem; color: var(--fad-text-muted); }
.fad-card-title { font-size: 1.15rem; margin: 0; width: 100%; order: 3; }
.fad-card-desc { color: var(--fad-text); max-width: 72ch; margin: 0.2rem 0 1rem; }

.fad-method {
    font-family: var(--fad-font-mono); font-weight: 700; font-size: 0.72rem; letter-spacing: 0.02em;
    padding: 0.2rem 0.55rem; border-radius: 6px; text-transform: uppercase;
}
.fad-method-sm { font-size: 0.64rem; padding: 0.12rem 0.4rem; margin-right: 0.4rem; }
.fad-method-get { color: var(--fad-get); background: var(--fad-get-soft); }
.fad-method-post { color: var(--fad-post); background: var(--fad-post-soft); }
.fad-method-put { color: var(--fad-put); background: var(--fad-put-soft); }
.fad-method-delete { color: var(--fad-delete); background: var(--fad-delete-soft); }

.fad-badge {
    font-size: 0.72rem; font-weight: 600; padding: 0.18rem 0.6rem; border-radius: 999px; order: 4;
}
.fad-badge-auth { background: var(--fad-primary-soft); color: var(--fad-primary); }
.fad-badge-public { background: var(--fad-post-soft); color: var(--fad-post); }

/* ---------- Tables ---------- */

.fad-table-wrap { margin: 0.75rem 0 1.1rem; }
.fad-table-title { font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--fad-text-muted); margin: 0 0 0.5rem; }
.fad-table { width: 100%; border-collapse: collapse; font-size: 0.87rem; }
.fad-table th {
    text-align: left; font-family: var(--fad-font-display); font-weight: 600; font-size: 0.76rem;
    text-transform: uppercase; letter-spacing: 0.03em; color: var(--fad-text-muted);
    border-bottom: 1px solid var(--fad-border); padding: 0.4rem 0.6rem;
}
.fad-table td { padding: 0.45rem 0.6rem; border-bottom: 1px solid var(--fad-border); vertical-align: top; }
.fad-table tr:last-child td { border-bottom: none; }
.fad-code-inline { font-family: var(--fad-font-mono); font-size: 0.85rem; color: var(--fad-primary); white-space: nowrap; }
.fad-field-type { font-family: var(--fad-font-mono); font-size: 0.8rem; color: var(--fad-text-muted); }
.fad-field-required { font-weight: 700; color: var(--fad-delete); font-size: 0.78rem; }
.fad-field-optional { color: var(--fad-text-muted); font-size: 0.78rem; }

/* ---------- Try it panel ---------- */

.fad-tryit { background: var(--fad-surface-alt); border: 1px solid var(--fad-border); border-radius: 12px; padding: 1.1rem 1.2rem; margin: 1rem 0; }
.fad-tryit-form { display: flex; flex-wrap: wrap; gap: 0.9rem; }
.fad-form-group { display: flex; flex-direction: column; gap: 0.3rem; min-width: 160px; }
.fad-form-group-wide { flex: 1 1 100%; min-width: 100%; }
.fad-form-label { font-size: 0.78rem; font-weight: 600; color: var(--fad-text-muted); display: flex; flex-direction: column; gap: 0.3rem; }
.fad-form-input, .fad-form-textarea {
    font-family: var(--fad-font-mono); font-size: 0.85rem; padding: 0.5rem 0.6rem; border-radius: 8px;
    border: 1px solid var(--fad-border); background: var(--fad-surface); color: var(--fad-text); resize: vertical;
}
.fad-form-input:focus, .fad-form-textarea:focus { outline: 2px solid var(--fad-accent); outline-offset: 1px; }

.fad-tryit-actions { display: flex; gap: 0.6rem; margin-top: 0.9rem; }
.fad-btn {
    font-family: var(--fad-font-display); font-weight: 600; font-size: 0.85rem; border-radius: 8px;
    padding: 0.5rem 1rem; border: 1px solid transparent; cursor: pointer;
}
.fad-btn-primary { background: var(--fad-primary); color: #fff; }
.fad-btn-primary:hover { background: var(--fad-primary-dark); }
.fad-btn-primary:disabled { opacity: 0.6; cursor: default; }
.fad-btn-ghost { background: transparent; border-color: var(--fad-border); color: var(--fad-text-muted); }
.fad-btn-ghost:hover { color: var(--fad-text); border-color: var(--fad-text-muted); }

.fad-result { margin-top: 1rem; }
.fad-result-hidden { display: none; }
.fad-result-meta { display: flex; align-items: center; gap: 0.7rem; margin-bottom: 0.5rem; }
.fad-result-status { font-family: var(--fad-font-mono); font-weight: 700; font-size: 0.8rem; padding: 0.2rem 0.6rem; border-radius: 6px; }
.fad-result-status-ok { background: var(--fad-post-soft); color: var(--fad-post); }
.fad-result-status-warn { background: var(--fad-put-soft); color: var(--fad-put); }
.fad-result-status-error { background: var(--fad-delete-soft); color: var(--fad-delete); }
.fad-result-time { font-family: var(--fad-font-mono); font-size: 0.78rem; color: var(--fad-text-muted); }

/* ---------- Code blocks / samples ---------- */

.fad-sample { margin-top: 0.5rem; }
.fad-sample-note { font-size: 0.85rem; color: var(--fad-text-muted); margin: 0 0 0.5rem; }
.fad-code-block {
    font-family: var(--fad-font-mono); font-size: 0.82rem; line-height: 1.55;
    background: var(--fad-code-bg); color: var(--fad-code-text);
    border-radius: 10px; padding: 1rem 1.1rem; margin: 0; overflow-x: auto; white-space: pre;
}

/* ---------- Back to top ---------- */

.fad-backtotop {
    position: fixed; bottom: 1.5rem; right: 1.5rem; width: 42px; height: 42px; border-radius: 50%;
    background: var(--fad-primary); color: #fff; display: flex; align-items: center; justify-content: center;
    font-size: 1.1rem; cursor: pointer; opacity: 0; pointer-events: none; transition: opacity 0.2s ease;
    box-shadow: var(--fad-shadow); z-index: 90;
}
.fad-backtotop-visible { opacity: 1; pointer-events: auto; }

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
    .fad-nav-toggle { display: flex; }
    .fad-token-bar { order: 3; flex: 1 1 100%; max-width: none; margin-left: 0; }
    .fad-topbar { flex-wrap: wrap; }

    .fad-sidebar {
        position: fixed; top: 0; left: 0; height: 100vh; z-index: 150; width: 280px;
        transform: translateX(-100%); transition: transform 0.2s ease; box-shadow: var(--fad-shadow);
    }
    .fad-sidebar-open { transform: translateX(0); }

    .fad-main { padding: 1.5rem 1.1rem 5rem; max-width: 100%; }
    .fad-hero h1 { font-size: 1.5rem; }
}

@media (max-width: 560px) {
    .fad-token-label { display: none; }
    .fad-tryit-form { flex-direction: column; }
    .fad-form-group { min-width: 100%; }
    .fad-card { padding: 1.1rem; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .fad-sidebar, .fad-backtotop { transition: none; }
}