/* ─────────────────────────────────────────────────────────────────────────
   Shared index-page shell
   Loaded by series.html and tool_matrix.html (before their own stylesheet).

   Both pages are the same shape: a hero card that introduces the page, a
   sticky toolbar that filters it, and a grid of cards below. Before this file
   each page had its own copy of that shape under a different prefix, and the
   copies had drifted — different sticky offsets, different z-indexes, one
   intro capped at a readable measure and one not. Anything that belongs to
   *both* pages lives here under `.page-*`; anything genuinely specific to one
   of them stays in series.css / tools.css.
   ───────────────────────────────────────────────────────────────────────── */

:root {
    /* Height of the sticky site header (1.25rem padding x2 + 1.75rem title
       line + 1px border). Every sticky element below the header offsets by
       this, so there is one number to change if the header ever resizes. */
    --sticky-top: 76px;
}

/* ── Hero ─────────────────────────────────────────────────────────────── */
.page-hero {
    background: linear-gradient(135deg, rgba(0, 255, 157, 0.07), rgba(0, 0, 0, 0));
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem 2.5rem;
    margin-bottom: 1.5rem;
}
.page-kicker {
    color: var(--accent);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}
.page-hero h1 {
    font-size: 2.6rem;
    font-weight: 800;
    letter-spacing: -1px;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}
.page-subtitle {
    color: var(--accent);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}
.page-intro {
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.75;
    /* Full width of the hero card, by preference — the intro reads as part of
       the box rather than as a column inset within it. */
    margin-bottom: 1.35rem;
}
.page-intro strong { color: var(--text-primary); }

/* ── Progress + standing facts ────────────────────────────────────────── */
.page-stats { max-width: 640px; margin-bottom: 1.35rem; }
.page-stats-head {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}
.page-stat-count { flex: 0 0 auto; white-space: nowrap; }
.page-stat-count strong { color: var(--accent); font-size: 1rem; }
.page-stat-pct { flex: 0 0 auto; color: var(--accent); font-weight: 700; }
.page-bar {
    flex: 1 1 auto;
    height: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 6px;
    overflow: hidden;
}
.page-bar-fill {
    display: block;
    height: 100%;
    background: linear-gradient(90deg, var(--accent-dim), var(--accent));
}
.page-meta-line {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem 1.1rem;
    margin: 0.7rem 0 0;
    font-size: 0.82rem;
    color: var(--text-muted);
}
.page-meta-line i { color: var(--accent); opacity: 0.8; margin-right: 0.3rem; }
.page-meta-line .is-emphasis { color: var(--text-primary); font-weight: 600; }

/* Small status dot used in meta lines (tools study status, and anything else
   that needs a colour key rather than an icon). */
.page-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 0.35rem;
    vertical-align: baseline;
}

/* ── Call-to-action row ───────────────────────────────────────────────── */
.page-cta { display: flex; flex-wrap: wrap; align-items: stretch; gap: 0.5rem; }
.page-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.9rem;
    border-radius: 7px;
    border: 1px solid rgba(0, 255, 157, 0.3);
    background: rgba(0, 255, 157, 0.07);
    color: var(--accent);
    font-size: 0.82rem;
    font-weight: 600;
    line-height: 1.35;
    text-decoration: none;
    transition: background 0.2s, border-color 0.2s, transform 0.2s;
}
.page-btn:hover {
    background: rgba(0, 255, 157, 0.18);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
}
.page-btn-primary { background: var(--accent); border-color: var(--accent); color: #0d1117; }
.page-btn-primary:hover { background: var(--accent-dim); border-color: var(--accent-dim); color: #0d1117; }
/* Two-line variant: a label over the thing it leads to. Its height sets the height of
   the whole row (the row stretches), so its line-heights are deliberately tight. */
.page-btn-stacked {
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
    padding: 0.25rem 0.9rem;
    max-width: 22rem;
}
.page-btn-label {
    font-size: 0.58rem;
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    opacity: 0.75;
}
.page-btn-sub {
    font-size: 0.8rem;
    font-weight: 600;
    line-height: 1.3;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
}
/* Visibly secondary to the primary action, without disappearing. */
.page-btn-quiet {
    background: transparent;
    border-color: var(--border);
    color: var(--text-muted);
    font-weight: 500;
}
.page-btn-quiet:hover { background: rgba(255, 255, 255, 0.04); color: var(--text-primary); }
.page-btn-icon { padding: 0.4rem 0.7rem; }

/* ── Disclosure ("what every post contains" / "why this matrix exists") ── */
.page-disclosure {
    margin-top: 1.5rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.02);
}
.page-disclosure > summary {
    cursor: pointer;
    padding: 0.6rem 1rem;
    color: var(--accent);
    font-size: 0.9rem;
    font-weight: 600;
    list-style: none;
    user-select: none;
}
.page-disclosure > summary::-webkit-details-marker { display: none; }
.page-disclosure > summary::before { content: "\25b8 "; }
.page-disclosure[open] > summary::before { content: "\25be "; }
.page-disclosure > summary:hover { color: var(--text-primary); }
.page-disclosure-body {
    padding: 0.25rem 1.25rem 1rem;
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.6;
}
.page-disclosure-body p { margin: 0 0 0.6rem; }
.page-disclosure-body p:last-child { margin-bottom: 0; }
.page-disclosure-body ol { margin: 0.75rem 0 0.75rem 1.25rem; }
.page-disclosure-body li { margin-bottom: 0.45rem; }
.page-disclosure-body strong { color: var(--text-primary); }
.page-disclosure-note { font-style: italic; margin-top: 0.75rem; }

/* ── Sticky toolbar ───────────────────────────────────────────────────── */
.page-toolbar {
    position: sticky;
    top: var(--sticky-top);
    z-index: 20;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.85rem 1rem;
    margin-bottom: 1.25rem;
}
.page-toolbar-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.6rem;
}
.page-toolbar-row + .page-toolbar-row { margin-top: 0.6rem; }
.page-toolbar input[type="search"],
.page-toolbar select {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.45rem 0.7rem;
    font-size: 0.85rem;
}
.page-toolbar input[type="search"] { flex: 1 1 16rem; min-width: 0; }
.page-toolbar input[type="search"]:focus,
.page-toolbar select:focus { outline: 1px solid var(--accent); border-color: var(--accent); }
.page-count { color: var(--text-muted); font-size: 0.85rem; white-space: nowrap; margin-left: auto; }
.page-count strong { color: var(--accent); }
.page-reset {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-muted);
    border-radius: 6px;
    padding: 0.4rem 0.8rem;
    font-size: 0.82rem;
    cursor: pointer;
    text-decoration: none;
}
.page-reset:hover { color: var(--text-primary); border-color: var(--accent); }

/* Toggle button (compact / focus): same footprint as .page-reset. */
.page-toggle-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    background: none;
    border: 1px solid var(--border);
    color: var(--text-muted);
    border-radius: 6px;
    padding: 0.4rem 0.7rem;
    font-size: 0.82rem;
    cursor: pointer;
}
.page-toggle-btn:hover { color: var(--text-primary); border-color: var(--accent); }
.page-toggle-btn[aria-pressed="true"] {
    color: var(--accent);
    border-color: rgba(0, 255, 157, 0.45);
    background: rgba(0, 255, 157, 0.08);
}

/* ── Pill navigation (jump to a series / filter by stage) ─────────────── */
.page-pills { display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem; }
.page-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: var(--bg-primary);
    color: var(--text-muted);
    font-size: 0.78rem;
    text-decoration: none;
    transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.page-pill:hover { color: var(--accent); border-color: rgba(0, 255, 157, 0.45); }
.page-pill.active {
    color: #0d1117;
    background: var(--accent);
    border-color: var(--accent);
    font-weight: 700;
}

/* ── Responsive ───────────────────────────────────────────────────────── */
@media (max-width: 700px) {
    .page-hero { padding: 1.5rem; }
    .page-hero h1 { font-size: 2rem; }
    /* The bar has nowhere to shrink to beside the count, so stack it. */
    .page-stats-head { flex-wrap: wrap; }
    .page-bar { order: 3; flex-basis: 100%; }
    .page-stat-pct { margin-left: auto; }
    .page-cta .page-btn { flex: 1 1 auto; justify-content: center; }
    .page-btn-stacked { max-width: 100%; align-items: flex-start; }
    .page-toolbar { position: static; }
    .page-count { margin-left: 0; }
}