@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&family=Inter:wght@400;500;600&family=Manrope:wght@400;500;600&display=swap');

:root {
    --font-serif: "Iowan Old Style", "Iowan Old Style BT", "Palatino", Georgia, serif;
    --font-sans: "Inter", "Manrope", -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, monospace;

    --color-text: #1a1d24;
    --color-text-soft: #4a5264;
    --color-muted: #8a94a6;
    --color-link: #1a1d24;

    --color-bg: #FBFAF7;
    --color-surface: #F4F1EB;
    --color-card: #FFFFFF;
    --color-border: #e8e2d6;
    --color-border-soft: #eee9de;

    /* Accent palette — aligned with paper's blue/slate theme */
    --accent-blue:    #2C5F8D;
    --accent-blue-soft: #DCE7F1;
    --accent-red:     #B8423A;
    --accent-red-soft:  #F2D9D6;
    --accent-green:   #4A7C59;
    --accent-green-soft: #DCE8DD;
    --accent-purple:  #6B4C8A;
    --accent-purple-soft: #E4DAEB;
    --accent-amber:   #B38438;
    --accent-amber-soft:  #F5E7C8;

    --width-content: 780px;
    --width-wide: 1200px;
    --radius: 10px;
    --radius-lg: 14px;
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 1px 2px rgba(18, 24, 38, 0.04);
    --shadow-md: 0 4px 14px rgba(18, 24, 38, 0.06);
    --shadow-lg: 0 10px 30px rgba(18, 24, 38, 0.08);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-serif);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.65;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* -------- Header / Nav -------- */
header.site-header {
    padding: 28px 60px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: var(--width-wide);
    margin: 0 auto;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--color-text);
}

.logo-mark {
    height: 32px;
    width: auto;
    display: inline-block;
    object-fit: contain;
}

.logo-text {
    font-family: var(--font-serif);
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.3px;
    color: var(--accent-blue);
}

header.site-header nav a {
    margin-left: 32px;
    text-decoration: none;
    color: #9aa3b2;
    font-family: var(--font-sans);
    font-size: 13.5px;
    font-weight: 500;
    letter-spacing: 0.04em;
    position: relative;
    transition: color 0.2s;
}

header.site-header nav a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -5px;
    width: 0;
    height: 1.5px;
    background: var(--color-text);
    transition: width 0.25s var(--ease);
}

header.site-header nav a.active,
header.site-header nav a:hover {
    color: var(--color-text);
}
header.site-header nav a.active::after,
header.site-header nav a:hover::after {
    width: 100%;
}

/* -------- Containers -------- */
.container {
    max-width: var(--width-content);
    margin: 20px auto 100px;
    padding: 0 24px;
}

.container-wide {
    max-width: var(--width-wide);
    margin: 20px auto 100px;
    padding: 0 24px;
}

/* -------- Hero -------- */
.hero {
    text-align: center;
    margin: 40px 0 46px;
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: 35px;
    line-height: 1.2;
    font-weight: 600;
    margin: 0 0 10px;
    color: var(--color-text);
    letter-spacing: -0.4px;
}
.hero h1 .ours {
    font-style: italic;
    color: var(--accent-blue);
}

.hero .subtitle {
    color: var(--color-text-soft);
    font-style: italic;
    font-size: 18px;
    margin: 0 auto 24px;
    max-width: 640px;
    line-height: 1.5;
}

.authors {
    font-family: var(--font-sans);
    font-size: 15px;
    color: var(--color-text-soft);
    margin: 0 auto 6px;
    max-width: 680px;
    line-height: 1.65;
}
.authors a { color: var(--color-text-soft); text-decoration: none; }
.authors a:hover { color: var(--accent-blue); }
.authors sup { font-size: 10px; vertical-align: super; color: var(--color-muted); }

.affiliations {
    font-family: var(--font-sans);
    font-size: 12.5px;
    color: var(--color-muted);
    margin: 0 auto 26px;
}

.resource-links {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
    margin: 0 0 10px;
}

.resource-link {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 7px 16px;
    text-decoration: none;
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-soft);
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    transition: all 0.2s var(--ease);
    letter-spacing: 0.01em;
}
.resource-link:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    background: #fff;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}
.resource-link svg { flex-shrink: 0; opacity: 0.75; }

/* -------- Body typography -------- */
h2.section-heading {
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent-blue);
    margin: 70px 0 18px;
    padding-bottom: 0;
    position: relative;
    display: inline-block;
}
h2.section-heading::before {
    content: '';
    display: inline-block;
    width: 22px;
    height: 1.5px;
    background: var(--accent-blue);
    vertical-align: middle;
    margin-right: 12px;
    opacity: 0.6;
}

h3.group-heading {
    font-family: var(--font-serif);
    font-size: 26px;
    font-weight: 600;
    color: var(--color-text);
    margin: 20px 0 6px;
    letter-spacing: -0.3px;
}
h3.group-heading + .group-kicker {
    font-family: var(--font-sans);
    font-size: 13.5px;
    color: var(--color-muted);
    margin: 0 0 22px;
    letter-spacing: 0.02em;
}

p {
    font-size: 17px;
    margin: 0 0 20px;
    color: var(--color-text);
}

a {
    color: var(--accent-blue);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    text-decoration-color: rgba(44, 95, 141, 0.35);
    transition: text-decoration-color 0.2s;
}
a:hover { text-decoration-color: var(--accent-blue); }

strong { font-weight: 600; color: var(--color-text); }
em { font-style: italic; }

/* -------- Figures -------- */
.figure-block {
    margin: 28px 0 36px;
    text-align: center;
}
.figure-block img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    mix-blend-mode: multiply;
}
.figure-block figcaption {
    margin-top: 12px;
    font-family: var(--font-sans);
    font-size: 13px;
    color: var(--color-muted);
    line-height: 1.6;
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
}
.figure-block figcaption strong { color: var(--color-text-soft); }

.figure-block.figure-table img {
    max-width: min(100%, 640px);
    mix-blend-mode: normal;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border-soft);
    background: #fff;
}

.case-study-note {
    font-family: var(--font-sans);
    font-size: 13.5px;
    color: var(--color-text-soft);
    background: var(--color-surface);
    border-left: 3px solid var(--accent-amber);
    padding: 12px 16px;
    border-radius: 0 8px 8px 0;
    margin: 0 0 22px;
    line-height: 1.6;
}
.case-study-note strong { color: var(--accent-amber); }

/* -------- Result tables (hand-coded, paper-style) -------- */
.result-table-wrap {
    margin: 18px 0 10px;
    background: #fff;
    border: 1px solid var(--color-border-soft);
    border-radius: var(--radius);
    padding: 14px 18px 16px;
    overflow-x: auto;
}
.result-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-sans);
    font-variant-numeric: tabular-nums lining-nums;
    font-size: 14.5px;
    color: var(--color-text);
    min-width: 440px;
}
.result-table thead th {
    font-weight: 600;
    text-align: center;
    padding: 10px 14px;
    color: var(--color-text);
    border-top: 2px solid var(--color-text);
    border-bottom: 1px solid var(--color-text);
    letter-spacing: 0.01em;
    font-size: 13.5px;
}
.result-table thead th:first-child { text-align: left; }
.result-table tbody td {
    padding: 9px 14px;
    text-align: center;
    border-bottom: 1px solid var(--color-border-soft);
    color: var(--color-text-soft);
}
.result-table tbody td:first-child {
    text-align: left;
    color: var(--color-text);
    font-weight: 500;
}
.result-table tbody tr:last-child td { border-bottom: 2px solid var(--color-text); }
.result-table tbody tr.best td { color: var(--color-text); }
.result-table tbody tr.best td.num { font-weight: 700; color: var(--accent-blue); }
.accent-green .result-table tbody tr.best td.num { color: var(--accent-green); }
.accent-red   .result-table tbody tr.best td.num { color: var(--accent-red); }
.accent-purple .result-table tbody tr.best td.num { color: var(--accent-purple); }
.accent-amber .result-table tbody tr.best td.num { color: var(--accent-amber); }
.result-table td.num { font-variant-numeric: tabular-nums; }
.result-table tbody tr.indent td:first-child { padding-left: 28px; position: relative; }
.result-table tbody tr.indent td:first-child::before {
    content: '+';
    color: var(--color-muted);
    position: absolute;
    left: 14px;
    font-weight: 600;
}
.result-table-caption {
    font-family: var(--font-sans);
    font-size: 13px;
    color: var(--color-muted);
    line-height: 1.55;
    margin: 10px 2px 0;
    text-align: left;
}
.result-table-caption strong { color: var(--color-text-soft); }

/* -------- Property cards -------- */
.property-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin: 10px 0 10px;
}

.card {
    background: var(--color-card);
    border: 1px solid var(--color-border-soft);
    border-left: 3px solid var(--accent-blue);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color 0.2s var(--ease), box-shadow 0.25s var(--ease), transform 0.25s var(--ease);
}
.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}
.card.open {
    box-shadow: var(--shadow-md);
}

/* Accent color variants */
.card.accent-blue    { border-left-color: var(--accent-blue); }
.card.accent-blue   .card-tag { color: var(--accent-blue);   background: var(--accent-blue-soft); }
.card.accent-green   { border-left-color: var(--accent-green); }
.card.accent-green  .card-tag { color: var(--accent-green);  background: var(--accent-green-soft); }
.card.accent-red     { border-left-color: var(--accent-red); }
.card.accent-red    .card-tag { color: var(--accent-red);    background: var(--accent-red-soft); }
.card.accent-purple  { border-left-color: var(--accent-purple); }
.card.accent-purple .card-tag { color: var(--accent-purple); background: var(--accent-purple-soft); }
.card.accent-amber   { border-left-color: var(--accent-amber); }
.card.accent-amber  .card-tag { color: var(--accent-amber);  background: var(--accent-amber-soft); }

.card-header {
    width: 100%;
    text-align: left;
    background: none;
    border: 0;
    padding: 18px 22px;
    display: flex;
    align-items: center;
    gap: 14px;
    cursor: pointer;
    font: inherit;
    color: inherit;
    transition: background 0.15s var(--ease);
}
.card-header:hover { background: #fdfcfa; }
.card-header:focus-visible { outline: 2px solid var(--accent-blue); outline-offset: -2px; }

.card-tag {
    font-family: var(--font-sans);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 4px 10px;
    border-radius: 999px;
    flex-shrink: 0;
    white-space: nowrap;
}

.card-title {
    font-family: var(--font-serif);
    font-size: 17.5px;
    font-weight: 600;
    line-height: 1.4;
    flex: 1;
    color: var(--color-text);
}

.card-chev {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    color: var(--color-muted);
    transition: transform 0.3s var(--ease), color 0.2s;
}
.card.open .card-chev {
    transform: rotate(180deg);
    color: var(--color-text);
}

.card-body-wrap {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.35s var(--ease);
}
.card.open .card-body-wrap {
    grid-template-rows: 1fr;
}
.card-body-inner { overflow: hidden; }

.card-body {
    padding: 0 22px 22px;
    border-top: 1px solid var(--color-border-soft);
    padding-top: 18px;
    margin-top: -1px;
}
.card-body p {
    font-size: 16px;
    color: var(--color-text-soft);
    margin: 0 0 16px;
    line-height: 1.7;
}
.card-body .figure-block { margin: 10px 0 0; }
.card-body .figure-block img { border-radius: 6px; }
.card-body .figure-block figcaption { font-size: 12.5px; }

/* Stat strip */
.stats {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0;
    margin: 10px 0 40px;
    border: 1px solid var(--color-border-soft);
    border-radius: var(--radius);
    background: var(--color-card);
    overflow: hidden;
}
.stat {
    padding: 18px 14px;
    text-align: center;
    border-right: 1px solid var(--color-border-soft);
}
.stat:last-child { border-right: 0; }
.stat .num {
    font-family: var(--font-serif);
    font-size: 26px;
    font-weight: 600;
    color: var(--accent-blue);
    letter-spacing: -0.5px;
    display: block;
    line-height: 1.15;
}
.stat .label {
    font-family: var(--font-sans);
    font-size: 11.5px;
    color: var(--color-muted);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-top: 4px;
    display: block;
}

@media (max-width: 640px) {
    .stats { grid-template-columns: repeat(2, 1fr); }
    .stat { border-right: 1px solid var(--color-border-soft); }
    .stat:nth-child(2n) { border-right: 0; }
    .stat:nth-child(1),
    .stat:nth-child(2),
    .stat:nth-child(3),
    .stat:nth-child(4) { border-bottom: 1px solid var(--color-border-soft); }
    .stat:last-child { grid-column: 1 / -1; border-right: 0; }
}

/* -------- Citation block -------- */
.citation-block {
    position: relative;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 18px 22px;
    margin: 14px 0 0;
    font-family: var(--font-mono);
    font-size: 12.5px;
    line-height: 1.65;
    color: var(--color-text-soft);
    overflow-x: auto;
}
.citation-block pre { margin: 0; white-space: pre-wrap; word-break: break-word; }
.copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 5px 8px;
    cursor: pointer;
    color: var(--color-muted);
    transition: all 0.15s;
    display: inline-flex;
    align-items: center;
}
.copy-btn:hover { color: var(--accent-blue); border-color: var(--accent-blue); }

/* -------- Footer -------- */
footer.site-footer {
    max-width: var(--width-wide);
    margin: 60px auto 40px;
    padding: 30px 60px 0;
    border-top: 1px solid var(--color-border-soft);
    font-family: var(--font-sans);
    font-size: 12.5px;
    color: var(--color-muted);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}
footer.site-footer a { color: var(--color-muted); text-decoration: none; }
footer.site-footer a:hover { color: var(--accent-blue); }

/* -------- Examples page -------- */
.container-explorer {
    max-width: 1180px;
}

.explorer-layout {
    display: grid;
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
}

.explorer-main { min-width: 0; }

.toc-sidebar {
    position: sticky;
    top: 24px;
    align-self: start;
    max-height: calc(100vh - 48px);
    overflow-y: auto;
    padding: 4px 18px 4px 0;
    border-right: 1px solid var(--color-border-soft);
    font-family: var(--font-sans);
}

.toc-title {
    font-size: 11.5px;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--color-muted);
    margin: 0 0 14px;
}

.toc-group { margin-bottom: 18px; }
.toc-group:last-child { margin-bottom: 0; }

.toc-group-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-soft);
    margin: 0 0 6px;
}

.toc-link {
    display: block;
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.5;
    padding: 4px 0;
    color: var(--color-text-soft);
    text-decoration: none;
    border: 0;
    word-break: break-all;
    transition: color 0.15s var(--ease);
}
.toc-link:hover { color: var(--accent-blue); }
.toc-link.active {
    color: var(--accent-blue);
    font-weight: 500;
}

@media (max-width: 900px) {
    .explorer-layout {
        display: block;
    }
    .toc-sidebar {
        position: static;
        max-height: none;
        border-right: 0;
        border-bottom: 1px solid var(--color-border-soft);
        padding: 0 0 16px;
        margin-bottom: 20px;
    }
}

.explorer-controls {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin: 26px 0 20px;
}
.chip {
    font-family: var(--font-sans);
    font-size: 12.5px;
    font-weight: 500;
    padding: 6px 14px;
    border-radius: 999px;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    color: var(--color-text-soft);
    cursor: pointer;
    transition: all 0.18s var(--ease);
}
.chip:hover { border-color: var(--accent-blue); color: var(--accent-blue); }
.chip.active {
    background: var(--accent-blue);
    color: #fff;
    border-color: var(--accent-blue);
}

.example-card {
    background: var(--color-card);
    border: 1px solid var(--color-border-soft);
    border-radius: var(--radius-lg);
    padding: 24px 26px;
    margin-bottom: 22px;
    box-shadow: var(--shadow-sm);
}
.example-meta {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    font-family: var(--font-sans);
    font-size: 12px;
    color: var(--color-muted);
    margin-bottom: 16px;
    padding-bottom: 14px;
    border-bottom: 1px dashed var(--color-border);
    letter-spacing: 0.03em;
}
.example-meta span strong {
    color: var(--color-text-soft);
    font-weight: 600;
}
.example-meta .pill {
    background: var(--accent-blue-soft);
    color: var(--accent-blue);
    padding: 2px 10px;
    border-radius: 999px;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.turn {
    margin: 14px 0;
    display: grid;
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 14px;
    align-items: start;
}
.turn > div { min-width: 0; }
.turn-label {
    font-family: var(--font-sans);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-muted);
    padding-top: 10px;
}
.turn.user .turn-label { color: var(--accent-blue); }
.turn.assistant .turn-label { color: var(--accent-green); }

.bubble {
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 15.5px;
    line-height: 1.6;
    min-width: 0;
    max-width: 100%;
    overflow-wrap: anywhere;
    word-break: break-word;
}
.bubble img { max-width: 100%; height: auto; }
.bubble a { word-break: break-all; }
.turn.user .bubble {
    background: var(--accent-blue-soft);
    color: var(--color-text);
    border: 1px solid rgba(44, 95, 141, 0.15);
}
.turn.assistant .bubble {
    background: #f5f2ec;
    color: var(--color-text);
    border: 1px solid var(--color-border-soft);
}

.thought {
    margin-top: 8px;
    padding: 10px 14px 10px 14px;
    border-left: 2px dashed;
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 14.5px;
    color: var(--color-text-soft);
    line-height: 1.55;
    background: rgba(255,255,255,0.4);
}
.thought.reason { border-color: var(--accent-purple); }
.thought.reaction { border-color: var(--accent-amber); }
.thought-label {
    font-family: var(--font-sans);
    font-style: normal;
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-right: 8px;
    padding: 2px 8px;
    border-radius: 4px;
    vertical-align: 2px;
}
.thought.reason .thought-label { color: var(--accent-purple); background: var(--accent-purple-soft); }
.thought.reaction .thought-label { color: var(--accent-amber); background: var(--accent-amber-soft); }

.category-tag {
    display: inline-block;
    font-family: var(--font-sans);
    font-style: normal;
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--color-text-soft);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: 1px 8px;
    border-radius: 4px;
    margin-left: 6px;
    vertical-align: 2px;
}

.example-summary {
    font-family: var(--font-sans);
    font-size: 13.5px;
    line-height: 1.55;
    color: var(--color-text-soft);
    background: var(--color-surface);
    border-left: 3px solid var(--accent-blue);
    padding: 10px 14px;
    border-radius: 4px;
    margin-bottom: 10px;
}
.example-summary strong { color: var(--color-text); }

.example-meta .muted { color: var(--color-muted); font-weight: 400; }

.bubble h3, .bubble h4, .bubble h5, .bubble h6 {
    margin: 10px 0 4px;
    font-family: var(--font-sans);
    font-weight: 600;
    line-height: 1.3;
}
.bubble h3 { font-size: 16px; }
.bubble h4 { font-size: 15px; }
.bubble h5 { font-size: 14.5px; }
.bubble h6 { font-size: 14px; }
.bubble p { margin: 6px 0; }
.bubble ul, .bubble ol { margin: 6px 0 6px 22px; padding: 0; }
.bubble li { margin: 2px 0; }
.bubble pre {
    background: rgba(0,0,0,0.04);
    padding: 10px 12px;
    border-radius: 6px;
    overflow-x: auto;
    font-size: 13px;
    margin: 8px 0;
    max-width: 100%;
}
.bubble pre code {
    background: transparent;
    padding: 0;
    white-space: pre;
    word-break: normal;
    overflow-wrap: normal;
}
.bubble code {
    font-family: var(--font-mono, ui-monospace, Menlo, monospace);
    font-size: 0.92em;
    background: rgba(0,0,0,0.05);
    padding: 1px 5px;
    border-radius: 3px;
    overflow-wrap: anywhere;
    word-break: break-word;
}
.bubble table {
    border-collapse: collapse;
    margin: 8px 0;
    font-size: 13.5px;
    display: block;
    overflow-x: auto;
    max-width: 100%;
}
.bubble th, .bubble td {
    border: 1px solid var(--color-border);
    padding: 6px 10px;
    text-align: left;
    vertical-align: top;
}
.bubble th { background: rgba(0,0,0,0.03); font-weight: 600; }

/* Collapsible long messages */
.bubble.collapsible {
    position: relative;
}
.bubble.collapsible.collapsed {
    max-height: 240px;
    overflow: hidden;
}
.bubble.collapsible.collapsed::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 80px;
    pointer-events: none;
    border-radius: 0 0 12px 12px;
}
.turn.assistant .bubble.collapsible.collapsed::after {
    background: linear-gradient(to bottom, rgba(245, 242, 236, 0) 0%, #f5f2ec 90%);
}
.turn.user .bubble.collapsible.collapsed::after {
    background: linear-gradient(to bottom, rgba(220, 231, 241, 0) 0%, var(--accent-blue-soft) 90%);
}
.read-more-toggle {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-top: 8px;
    padding: 4px 12px;
    font-family: var(--font-sans);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-text-soft);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.read-more-toggle:hover {
    color: var(--color-text);
    border-color: var(--color-text-soft);
}
.read-more-toggle:focus-visible {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}
.read-more-toggle .chev {
    width: 10px;
    height: 10px;
    transition: transform 0.2s ease;
}
.read-more-toggle[aria-expanded="true"] .chev {
    transform: rotate(180deg);
}

/* Explorer empty state */
.empty-note {
    margin: 24px 0;
    padding: 16px 20px;
    background: var(--color-surface);
    border: 1px dashed var(--color-border);
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: 13px;
    color: var(--color-text-soft);
}

/* -------- Responsive -------- */
@media (max-width: 720px) {
    header.site-header { padding: 22px 22px; }
    .hero h1 { font-size: 26px; }
    .card-header { padding: 14px 16px; gap: 10px; }
    .card-tag { font-size: 10px; padding: 3px 8px; }
    .card-title { font-size: 15.5px; }
    .card-body { padding: 0 16px 16px; padding-top: 14px; }
    footer.site-footer { padding: 28px 22px 0; }
    .turn { grid-template-columns: 1fr; gap: 6px; }
    .turn-label { padding-top: 0; }
}