/* ── Theme tokens ───────────────────────────────────────────── */
:root, [data-theme="dark"] {
    --bg-page:       #2d3436;
    --bg-card:       #3d4345;
    --bg-item:       #474e50;
    --bg-answer:     #404849;
    --border:        #4a5253;
    --border-input:  #576061;
    --text-primary:  #e8e8e8;
    --text-secondary:#b0b0b0;
    --text-muted:    #888888;
    --accent:        #e17055;
    --accent-hover:  #c9604a;
    --cat-active-bg: #e17055;
    --cat-active-fg: #fff;
    --kbd-bg:        #1e2426;
    --kbd-border:    #576061;
}
[data-theme="light"] {
    --bg-page:       #f8fafc;
    --bg-card:       #ffffff;
    --bg-item:       #f8fafc;
    --bg-answer:     #f1f5f9;
    --border:        #e2e8f0;
    --border-input:  #cbd5e1;
    --text-primary:  #0f172a;
    --text-secondary:#475569;
    --text-muted:    #94a3b8;
    --accent:        #e17055;
    --accent-hover:  #c9604a;
    --cat-active-bg: #e17055;
    --cat-active-fg: #fff;
    --kbd-bg:        #f1f5f9;
    --kbd-border:    #cbd5e1;
}
[data-theme="ocean"] {
    --bg-page: #0d1b2a; --bg-card: #1e3448; --bg-item: #243d52; --bg-answer: #1b2a3b;
    --border: #2a4a60; --border-input: #3a6080;
    --text-primary: #e0f0ff; --text-secondary: #90b8d8; --text-muted: #5a84a0;
    --accent: #14b8a6; --accent-hover: #0d9488;
    --cat-active-bg: #14b8a6; --cat-active-fg: #fff;
    --kbd-bg: #0d1b2a; --kbd-border: #3a6080;
}
[data-theme="forest"] {
    --bg-page: #0f1e12; --bg-card: #1e2e20; --bg-item: #263829; --bg-answer: #172419;
    --border: #2a3e2d; --border-input: #3a5040;
    --text-primary: #e0f5e2; --text-secondary: #8db899; --text-muted: #5a7d62;
    --accent: #10b981; --accent-hover: #059669;
    --cat-active-bg: #10b981; --cat-active-fg: #fff;
    --kbd-bg: #0f1e12; --kbd-border: #3a5040;
}
[data-theme="midnight"] {
    --bg-page: #110d1e; --bg-card: #221c3a; --bg-item: #2c2448; --bg-answer: #1a1530;
    --border: #302860; --border-input: #453d70;
    --text-primary: #ede8ff; --text-secondary: #a89ec8; --text-muted: #6b6290;
    --accent: #8b5cf6; --accent-hover: #7c3aed;
    --cat-active-bg: #8b5cf6; --cat-active-fg: #fff;
    --kbd-bg: #110d1e; --kbd-border: #453d70;
}
[data-theme="rose"] {
    --bg-page: #fff5f5; --bg-card: #ffffff; --bg-item: #fef2f2; --bg-answer: #fde8e8;
    --border: #fde8e8; --border-input: #fbc8c8;
    --text-primary: #1f0a0a; --text-secondary: #7f3838; --text-muted: #b87070;
    --accent: #e11d48; --accent-hover: #be123c;
    --cat-active-bg: #e11d48; --cat-active-fg: #fff;
    --kbd-bg: #fff5f5; --kbd-border: #fbc8c8;
}

/* ── Base ────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
img { max-width: 100%; }
body {
    background: var(--bg-page);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    min-height: 100vh;
}

/* ── Theme toggle ────────────────────────────────────────────── */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-primary);
    z-index: 100;
}
.theme-toggle:hover { opacity: 0.8; }

/* ── Layout ──────────────────────────────────────────────────── */
.faq-container {
    max-width: 860px;
    margin: 0 auto;
    padding: 48px 20px 80px;
}

/* ── Header ──────────────────────────────────────────────────── */
.faq-header {
    text-align: center;
    margin-bottom: 40px;
}
.brand-logo { margin-bottom: 10px; }
.brand-logo img { max-width: 120px; display: none; }
html[data-theme="dark"]  .brand-logo .white-logo { display: inline-block; }
html[data-theme="light"] .brand-logo .black-logo { display: inline-block; }

.logo {
    font-size: 1.6rem;
    font-weight: 800;
    background: linear-gradient(135deg, #e17055, #fab1a0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 12px;
}
.faq-header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
}
.faq-subtitle {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 20px;
}
.faq-nav-links {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}
.faq-nav-links a {
    color: var(--accent);
    text-decoration: none;
    font-size: 14px;
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-card);
    transition: background .15s;
}
.faq-nav-links a:hover { background: var(--bg-item); }

/* ── Search ──────────────────────────────────────────────────── */
.faq-search-wrap { margin-bottom: 28px; }
.faq-search {
    position: relative;
    display: flex;
    align-items: center;
}
.faq-search > .bi-search {
    position: absolute;
    left: 14px;
    color: var(--text-muted);
    pointer-events: none;
}
.faq-search input {
    width: 100%;
    padding: 12px 44px 12px 40px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 15px;
    outline: none;
    transition: border-color .15s;
}
.faq-search input:focus { border-color: var(--accent); }
.faq-search input::placeholder { color: var(--text-muted); }
.faq-search-clear {
    position: absolute;
    right: 10px;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px 6px;
    border-radius: 6px;
    line-height: 1;
}
.faq-search-clear:hover { color: var(--text-primary); }
.faq-search-count {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 8px 0 0 4px;
}

/* ── Category nav ────────────────────────────────────────────── */
.faq-category-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 32px;
}
.cat-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text-secondary);
    padding: 5px 14px;
    font-size: 13px;
    cursor: pointer;
    transition: all .15s;
    white-space: nowrap;
}
.cat-btn:hover { border-color: var(--accent); color: var(--accent); }
.cat-btn.active {
    background: var(--cat-active-bg);
    border-color: var(--cat-active-bg);
    color: var(--cat-active-fg);
    font-weight: 600;
}

/* ── No results ──────────────────────────────────────────────── */
.faq-no-results {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}
.faq-no-results p { margin: 12px 0 0; }

/* ── Section ─────────────────────────────────────────────────── */
.faq-section { margin-bottom: 36px; }
.faq-section-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ── FAQ item / accordion ────────────────────────────────────── */
.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    margin-bottom: 8px;
    overflow: hidden;
}
.faq-question {
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    padding: 16px 20px;
    font-size: 14.5px;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    line-height: 1.4;
    transition: background .15s;
}
.faq-question:hover { background: var(--bg-item); }
.faq-item.open .faq-question { background: var(--bg-item); color: var(--accent); }

.faq-chevron {
    flex-shrink: 0;
    font-size: 13px;
    color: var(--text-muted);
    transition: transform .25s ease;
}
.faq-item.open .faq-chevron { transform: rotate(180deg); color: var(--accent); }

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height .3s ease, padding .3s ease;
    padding: 0 20px;
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-secondary);
    background: var(--bg-answer);
    border-top: 0px solid var(--border);
}
.faq-item.open .faq-answer {
    max-height: 600px;
    padding: 16px 20px;
    border-top-width: 1px;
}

.faq-answer code {
    background: var(--bg-page);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 1px 6px;
    font-size: 13px;
    color: var(--accent);
}
.faq-answer ul, .faq-answer ol {
    padding-left: 20px;
    margin: 6px 0;
}
.faq-answer li { margin-bottom: 4px; }

kbd {
    background: var(--kbd-bg);
    border: 1px solid var(--kbd-border);
    border-radius: 4px;
    padding: 2px 7px;
    font-size: 12px;
    font-family: monospace;
    color: var(--text-primary);
}

.faq-answer .table {
    border-color: var(--border);
    font-size: 13px;
}
.faq-answer .table th,
.faq-answer .table td {
    border-color: var(--border);
    padding: 6px 10px;
    color: inherit;
}

/* ── Footer ──────────────────────────────────────────────────── */
.faq-footer {
    text-align: center;
    margin-top: 56px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 14px;
}
.faq-footer .btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    margin-top: 16px;
}
.faq-footer .btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 600px) {
    .faq-container { padding: 32px 14px 60px; }
    .faq-header h1 { font-size: 1.5rem; }
    .faq-question { font-size: 14px; padding: 14px 16px; }
    .faq-answer { font-size: 13px; }
}