/* ── Hero ─────────────────────────────────────────── */

.landing-hero {
    padding: 5rem 2rem 3.5rem;
    text-align: center;
}

.landing-hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--text);
    line-height: 1.15;
    margin-bottom: 1.125rem;
}

.landing-hero h1 em {
    font-style: normal;
    color: var(--accent);
}

.landing-hero p {
    font-size: 1.05rem;
    color: var(--text-muted);
    line-height: 1.75;
    max-width: 36rem;
    margin: 0 auto;
}

/* ── List section ─────────────────────────────────── */

.landing-list-section {
    max-width: 44rem;
    margin: 0 auto 5rem;
    padding: 0 1.5rem;
}

.section-label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 0.875rem;
    padding-left: 0.25rem;
}

/* ── Keyword list ─────────────────────────────────── */

#fullListKeywords {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

#fullListKeywords .keyword {
    display: flex;
    flex-direction: column;
    cursor: pointer;
    border-bottom: 1px solid var(--border);
    transition: background var(--transition);
}

#fullListKeywords .keyword:last-of-type {
    border-bottom: none;
}

#fullListKeywords .keyword:hover {
    background: var(--surface-hover);
}

.keyword-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.875rem 1.25rem;
    gap: 0.75rem;
}

.keyword-header a {
    font-size: 0.9625rem;
    font-weight: 500;
    color: var(--text);
    text-decoration: none;
    flex: 1;
    transition: color var(--transition);
}

#fullListKeywords .keyword:hover .keyword-header a {
    color: var(--accent);
}

.expand-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.75rem;   /* 44px — WCAG 2.5.5 */
    height: 2.75rem;
    flex-shrink: 0;
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    color: var(--text-dim);
    transition: color var(--transition);
    border-radius: var(--radius-sm);
}

.expand-btn svg {
    transition: transform 0.25s ease;
    pointer-events: none;
}

/* Hover on a closed row: rotate arrow down to hint expansion */
#fullListKeywords .keyword:not(.is-open):hover > .keyword-header .expand-btn,
.expand-btn:hover {
    color: var(--accent);
}

#fullListKeywords .keyword:not(.is-open):hover > .keyword-header .expand-btn svg {
    transform: rotate(90deg);
}

/* Open state: arrow stays pointing down */
#fullListKeywords .keyword.is-open > .keyword-header .expand-btn svg {
    transform: rotate(90deg);
}

/* Open + hover: keep arrow down */
#fullListKeywords .keyword.is-open:hover > .keyword-header .expand-btn {
    color: var(--accent);
}

/* ── Nested children ──────────────────────────────── */

.keyword > ul {
    border-top: 1px solid var(--border);
    background: var(--surface-2);
}

.keyword > ul .keyword {
    padding-left: 1.5rem;
    background: transparent;
    border-bottom: 1px solid var(--border);
}

.keyword > ul .keyword:last-of-type {
    border-bottom: none;
}

.keyword > ul .keyword:hover {
    background: var(--surface-hover);
}

path {
    pointer-events: none;
}