/* ==========================================================================
   WikiExplore - "Knowledge Blueprint"
   Cobalt Swiss editorial system. Display serif (Newsreader) + UI sans
   (Public Sans) + system mono for index labels. Two themes via tokens.
   ========================================================================== */

:root {
    --bg: #F5F7FB;
    --surface: #FFFFFF;
    --surface-2: #EDF1F8;
    --surface-3: #E1E8F3;
    --ink: #0B1526;
    --ink-2: #46536E;
    --muted: #6C7892;
    --line: #DEE5F0;
    --line-strong: #C7D2E4;
    --cobalt: #2456E6;
    --cobalt-deep: #173FBC;
    --cobalt-tint: #E9F0FF;
    --cobalt-tint-2: #D7E4FF;
    --violet: #6D28D9;
    --violet-tint: #F0EAFC;
    --gold: #B45309;
    --gold-fill: #D97706;
    --glass: rgba(255, 255, 255, 0.86);
    --danger: #DC2626;

    --r-sm: 8px;
    --r-md: 12px;
    --r-lg: 16px;
    --r-full: 999px;

    --s1: 0 1px 2px rgba(11, 21, 38, 0.05), 0 1px 3px rgba(11, 21, 38, 0.04);
    --s2: 0 2px 6px -2px rgba(11, 21, 38, 0.07), 0 10px 24px -12px rgba(11, 21, 38, 0.12);
    --s3: 0 24px 60px -24px rgba(11, 21, 38, 0.3);

    --font-display: "Newsreader", "Iowan Old Style", Georgia, serif;
    --font-body: "Public Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
    --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", "Segoe UI Mono", Consolas, monospace;

    --ease: cubic-bezier(0.22, 1, 0.36, 1);
    --fast: 140ms;
    --med: 220ms;
    --slow: 380ms;
    --header-h: 64px;
}

html.dark-theme {
    --bg: #0A0F1C;
    --surface: #101828;
    --surface-2: #161F34;
    --surface-3: #1E2A45;
    --ink: #E8EEF9;
    --ink-2: #A9B8D0;
    --muted: #7E8DA8;
    --line: #223049;
    --line-strong: #32415F;
    --cobalt: #6C9AFF;
    --cobalt-deep: #8DB4FF;
    --cobalt-tint: #17284C;
    --cobalt-tint-2: #1E3460;
    --violet: #A78BFA;
    --violet-tint: #251A47;
    --gold: #F2B90C;
    --gold-fill: #F2B90C;
    --glass: rgba(16, 24, 40, 0.8);
    --danger: #F87171;

    --s1: 0 1px 2px rgba(0, 0, 0, 0.3);
    --s2: 0 2px 8px -2px rgba(0, 0, 0, 0.4), 0 14px 34px -14px rgba(0, 0, 0, 0.5);
    --s3: 0 24px 70px -22px rgba(0, 0, 0, 0.65);
}

/* Theme icons: show the right glyph per theme */
#theme-icon .icon-sun { display: none; }
html.dark-theme #theme-icon .icon-moon { display: none; }
html.dark-theme #theme-icon .icon-sun { display: block; }

/* --------------------------------------------------------------------------
   Reset & base
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--ink);
    background-color: var(--bg);
    -webkit-font-smoothing: antialiased;
    transition: background-color var(--med) var(--ease), color var(--med) var(--ease);
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--cobalt); text-decoration: none; }
svg { display: block; }

.container { width: min(1200px, 92%); margin-inline: auto; }

::selection { background: var(--cobalt-tint-2); }

/* Visible keyboard focus everywhere */
a:focus-visible, button:focus-visible, select:focus-visible, input:focus-visible,
[tabindex]:focus-visible {
    outline: 2px solid var(--cobalt);
    outline-offset: 2px;
    border-radius: 4px;
}
.search-input-wrapper:focus-within, .hero-search-box:focus-within {
    outline: 2px solid var(--cobalt);
    outline-offset: 2px;
}

.skip-link {
    position: fixed;
    top: -100px;
    left: 16px;
    z-index: 9999;
    background: var(--ink);
    color: var(--bg);
    padding: 8px 14px;
    border-radius: var(--r-sm);
    font-weight: 600;
    transition: top var(--fast) var(--ease);
}
.skip-link:focus { top: 12px; }

/* --------------------------------------------------------------------------
   Buttons & shared UI atoms
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 18px;
    font: 600 15px var(--font-body);
    border-radius: 10px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background-color var(--fast) var(--ease), border-color var(--fast) var(--ease),
        color var(--fast) var(--ease), transform var(--fast) var(--ease), box-shadow var(--med) var(--ease);
}
.btn svg { width: 15px; height: 15px; }
.btn:active { transform: translateY(0) scale(0.98); }

.btn-primary { background: var(--cobalt); color: #fff; box-shadow: 0 6px 16px -8px var(--cobalt); }
.btn-primary:hover { background: var(--cobalt-deep); }
html.dark-theme .btn-primary { color: #fff; }

.btn-outline {
    background: transparent;
    color: var(--cobalt-deep);
    border-color: var(--line-strong);
    font-weight: 600;
}
.btn-outline:hover { border-color: var(--cobalt); background: var(--cobalt-tint); }
html.dark-theme .btn-outline { color: var(--cobalt); }

.btn-sm { padding: 8px 14px; font-size: 13.5px; border-radius: 8px; }

.text-btn {
    background: none;
    border: none;
    color: var(--muted);
    font: 600 13px var(--font-body);
    cursor: pointer;
    padding: 4px 6px;
    border-radius: 6px;
    transition: color var(--fast) var(--ease);
}
.text-btn:hover { color: var(--cobalt); }

.category-tag {
    display: inline-block;
    padding: 4px 9px;
    background: var(--cobalt-tint);
    color: var(--cobalt-deep);
    font: 700 10.5px var(--font-mono);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    border-radius: var(--r-full);
}

/* Section framing */
.eyebrow {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    font: 600 11px var(--font-mono);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--muted);
}
.eyebrow::before { content: ""; width: 18px; height: 2px; background: var(--cobalt); border-radius: 2px; }

.section-header { margin-bottom: 30px; }
.section-title {
    margin: 0;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(26px, 2.4vw, 34px);
    line-height: 1.15;
    letter-spacing: -0.015em;
    color: var(--ink);
}
.section-desc { margin: 6px 0 0; color: var(--muted); font-size: 15px; }

section[id] { scroll-margin-top: calc(var(--header-h) + 24px); }

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--glass);
    -webkit-backdrop-filter: saturate(1.4) blur(12px);
    backdrop-filter: saturate(1.4) blur(12px);
    border-bottom: 1px solid var(--line);
}
.header-container {
    display: flex;
    align-items: center;
    gap: 22px;
    max-width: 1280px;
    margin-inline: auto;
    padding: 0 24px;
    height: var(--header-h);
}
.logo { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); }
.logo:hover { color: var(--ink); }
.logo-icon { display: inline-flex; color: var(--cobalt); flex: none; }
.header-container .logo-icon svg { width: 27px; height: 27px; }
.logo-text { display: flex; flex-direction: column; line-height: 1.15; }
.logo-title { font-family: var(--font-display); font-weight: 700; font-size: 19px; letter-spacing: -0.02em; }
.logo-tagline { font: 500 10.5px var(--font-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }

.header-search { flex: 1; max-width: 430px; margin-left: auto; position: relative; }
.search-input-wrapper {
    display: flex;
    align-items: center;
    gap: 4px;
    background: var(--surface-2);
    border: 1px solid transparent;
    border-radius: var(--r-full);
    padding: 0 6px 0 14px;
    height: 42px;
    transition: background-color var(--fast) var(--ease), border-color var(--fast) var(--ease), box-shadow var(--med) var(--ease);
}
.search-input-wrapper:focus-within { background: var(--surface); border-color: var(--cobalt); box-shadow: 0 0 0 4px var(--cobalt-tint); }
.search-prefix { width: 16px; height: 16px; color: var(--muted); flex: none; }
.search-input-wrapper input {
    flex: 1;
    min-width: 0;
    background: transparent;
    border: none;
    color: var(--ink);
    font: 400 14px var(--font-body);
    outline: none;
    padding: 0;
}
.search-btn {
    width: 30px;
    height: 30px;
    display: grid;
    place-items: center;
    border: none;
    border-radius: var(--r-full);
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    transition: color var(--fast) var(--ease), background-color var(--fast) var(--ease);
}
.search-btn:hover { color: var(--surface); background: var(--cobalt); }
.search-btn svg { width: 15px; height: 15px; }

/* Dropdown */
.search-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    display: none;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    box-shadow: var(--s2);
    padding: 6px;
    z-index: 1001;
}
.search-dropdown.show { display: block; animation: dropdown-in var(--fast) var(--ease); }
@keyframes dropdown-in { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }
.search-result-item { border-radius: 8px; cursor: pointer; transition: background-color var(--fast) var(--ease); }
.search-result-item:hover { background: var(--surface-2); }
.search-dropdown .search-result-item { padding: 9px 12px; }
.result-title { font-weight: 600; font-size: 14px; color: var(--ink); }
.result-snippet { font-size: 12.5px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* Nav links */
.main-nav { display: flex; align-items: center; }
.nav-links { display: flex; align-items: center; list-style: none; gap: 4px; margin: 0; padding: 0; }
.nav-link {
    position: relative;
    display: inline-block;
    padding: 8px 11px;
    font-weight: 600;
    font-size: 14px;
    color: var(--ink-2);
    border-radius: 8px;
    transition: color var(--fast) var(--ease);
}
.nav-link::after {
    content: "";
    position: absolute;
    left: 11px;
    right: 11px;
    bottom: 3px;
    height: 2px;
    border-radius: 2px;
    background: var(--cobalt);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--med) var(--ease);
}
.nav-link:hover { color: var(--cobalt); text-decoration: none; }
.nav-link.active { color: var(--ink); }
.nav-link.active::after { transform: scaleX(1); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

/* Header actions */
.header-actions { display: flex; align-items: center; gap: 8px; }
.theme-toggle-btn {
    width: 40px;
    height: 40px;
    display: grid;
    place-items: center;
    background: var(--surface-2);
    border: 1px solid transparent;
    border-radius: var(--r-full);
    color: var(--ink-2);
    cursor: pointer;
    transition: color var(--fast) var(--ease), background-color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}
.theme-toggle-btn:hover { color: var(--cobalt); border-color: var(--line-strong); }
#theme-icon svg { width: 17px; height: 17px; }
.theme-toggle-btn.spin #theme-icon { animation: theme-spin 0.3s var(--ease); }
@keyframes theme-spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

.mobile-menu-btn { display: none; }

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero-section {
    position: relative;
    overflow: hidden;
    padding: clamp(72px, 10vh, 118px) 20px clamp(56px, 8vh, 88px);
    text-align: center;
    border-bottom: 1px solid var(--line);
    background:
        radial-gradient(900px 420px at 50% -160px, var(--cobalt-tint-2), transparent 65%),
        linear-gradient(180deg, var(--surface) 0%, var(--bg) 100%);
}
html.dark-theme .hero-section {
    background:
        radial-gradient(900px 420px at 50% -160px, rgba(108, 154, 255, 0.16), transparent 65%),
        linear-gradient(180deg, #0C1220 0%, var(--bg) 100%);
}
/* faint blueprint grid */
.hero-section::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: radial-gradient(var(--line) 1px, transparent 1px);
    background-size: 26px 26px;
    opacity: 0.45;
    -webkit-mask-image: radial-gradient(720px 380px at 50% 0%, black, transparent 78%);
    mask-image: radial-gradient(720px 380px at 50% 0%, black, transparent 78%);
    pointer-events: none;
}
.hero-content { position: relative; max-width: 840px; margin-inline: auto; }

.badge-hero {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 13px;
    background: var(--surface);
    border: 1px solid var(--line);
    color: var(--cobalt-deep);
    font: 700 11px var(--font-mono);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    border-radius: var(--r-full);
    box-shadow: var(--s1);
}
html.dark-theme .badge-hero { color: var(--cobalt); }

.hero-title {
    margin: 20px auto 14px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(40px, 6vw, 68px);
    line-height: 1.04;
    letter-spacing: -0.025em;
    color: var(--ink);
    max-width: 16ch;
}
.hero-em {
    font-style: italic;
    font-weight: 500;
    color: var(--cobalt);
}
.hero-subtitle {
    margin: 0 auto 34px;
    max-width: 560px;
    color: var(--ink-2);
    font-size: 17px;
    line-height: 1.6;
}

.hero-search-box {
    display: flex;
    align-items: center;
    gap: 8px;
    max-width: 640px;
    margin-inline: auto;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: var(--s2);
    padding: 6px 6px 6px 18px;
    transition: border-color var(--fast) var(--ease), box-shadow var(--med) var(--ease);
}
.hero-search-box:focus-within { border-color: var(--cobalt); box-shadow: var(--s2), 0 0 0 4px var(--cobalt-tint); }
.hero-search-icon { width: 18px; height: 18px; color: var(--muted); flex: none; }
.hero-search-box input {
    flex: 1;
    min-width: 0;
    border: none;
    background: transparent;
    outline: none;
    color: var(--ink);
    font: 400 16px var(--font-body);
    padding: 12px 0;
}
.hero-search-box .btn { flex: none; }

.hero-stats {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    max-width: 640px;
    margin: 30px auto 0;
    padding: 0;
    border-block: 1px solid var(--line);
}
.hero-stats li { padding: 16px 6px 14px; }
.hero-stats li + li { border-left: 1px solid var(--line); }
.hero-stats strong {
    display: block;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 26px;
    line-height: 1;
    letter-spacing: -0.02em;
    color: var(--ink);
}
.hero-stats span {
    display: block;
    margin-top: 5px;
    font: 600 10px var(--font-mono);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
}

/* --------------------------------------------------------------------------
   Featured section
   -------------------------------------------------------------------------- */
.featured-section, .popular-section, .categories-section, .explore-section { padding: 56px 0 24px; }
.article-section { padding-top: 24px; }

.featured-card {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--line);
    border-top: 3px solid var(--cobalt);
    border-radius: var(--r-lg);
    box-shadow: var(--s1);
    padding: 30px 30px 30px 34px;
    overflow: hidden;
}
.featured-card::after {
    content: "";
    position: absolute;
    right: -90px;
    top: -90px;
    width: 240px;
    height: 240px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--cobalt-tint-2), transparent 68%);
    pointer-events: none;
}
.featured-badge {
    position: absolute;
    top: 18px;
    right: 22px;
    background: var(--violet-tint);
    color: var(--violet);
    font: 700 10px var(--font-mono);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 5px 11px;
    border-radius: var(--r-full);
}
.featured-body {
    display: grid;
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: center;
}
.featured-topline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px 16px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--line);
    margin-bottom: 16px;
}
.featured-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0;
    font: 600 11px var(--font-mono);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--muted);
}
.featured-meta span + span { border-left: 1px solid var(--line-strong); padding-left: 12px; margin-left: 12px; }
.featured-title {
    margin: 0 0 10px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(26px, 3vw, 34px);
    line-height: 1.12;
    letter-spacing: -0.015em;
    color: var(--ink);
}
.featured-text { margin: 0 0 22px; color: var(--ink-2); font-size: 15.5px; line-height: 1.72; }
.featured-info .btn { margin-top: 4px; }

.featured-preview-box .fact-box {
    background: var(--surface-2);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    padding: 22px 22px 18px;
}
.fact-box h4 {
    margin: 0 0 6px;
    font: 700 11px var(--font-mono);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--muted);
}
.fact-box ul { list-style: none; margin: 12px 0 0; padding: 0; }
.fact-box li {
    padding: 9px 0 9px 16px;
    border-top: 1px dashed var(--line-strong);
    font-size: 13.5px;
    color: var(--ink-2);
    line-height: 1.5;
}
.fact-box li:first-child { border-top: none; }
.fact-box li strong { color: var(--ink); font-weight: 600; }

/* --------------------------------------------------------------------------
   Popular topics
   -------------------------------------------------------------------------- */
.popular-cards-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 16px;
}
.popular-card {
    display: flex;
    flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    padding: 22px;
    cursor: pointer;
    box-shadow: var(--s1);
    transition: transform var(--med) var(--ease), box-shadow var(--med) var(--ease), border-color var(--med) var(--ease);
}

.popular-icon {
    width: 46px;
    height: 46px;
    display: grid;
    place-items: center;
    background: var(--cobalt-tint);
    color: var(--cobalt-deep);
    border-radius: 12px;
    margin-bottom: 16px;
    transition: transform var(--med) var(--ease);
}

.popular-icon svg { width: 23px; height: 23px; }
.popular-card h4 { margin: 0 0 6px; font-family: var(--font-display); font-weight: 600; font-size: 19px; color: var(--ink); letter-spacing: -0.01em; }
.popular-card p { margin: 0 0 16px; color: var(--muted); font-size: 13.5px; line-height: 1.55; flex: 1; }
.card-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-weight: 600;
    font-size: 13.5px;
    color: var(--cobalt);
}

.card-link svg { width: 13px; height: 13px; transition: transform var(--fast) var(--ease); }

/* --------------------------------------------------------------------------
   Recently viewed
   -------------------------------------------------------------------------- */
.recent-section { padding: 34px 0 26px; }
.section-header-compact { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.recent-heading {
    display: flex;
    align-items: center;
    gap: 9px;
    margin: 0;
    font-size: 15px;
    font-weight: 600;
    color: var(--ink-2);
}
.recent-heading svg { width: 16px; height: 16px; color: var(--cobalt); }
.recent-chips-container { display: flex; flex-wrap: wrap; gap: 8px; }
.recent-chip {
    padding: 7px 15px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-full);
    font-size: 13.5px;
    color: var(--ink-2);
    cursor: pointer;
    transition: border-color var(--fast) var(--ease), color var(--fast) var(--ease), background-color var(--fast) var(--ease);
}
.recent-chip:hover { border-color: var(--cobalt); color: var(--cobalt-deep); background: var(--cobalt-tint); }
.recent-empty { font-size: 13.5px; color: var(--muted); }

/* --------------------------------------------------------------------------
   Categories
   -------------------------------------------------------------------------- */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(178px, 1fr));
    gap: 14px;
}
.category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    padding: 26px 16px 20px;
    box-shadow: var(--s1);
    transition: transform var(--med) var(--ease), box-shadow var(--med) var(--ease), border-color var(--med) var(--ease);
}

.category-icon {
    width: 52px;
    height: 52px;
    display: grid;
    place-items: center;
    background: var(--cobalt-tint);
    color: var(--cobalt-deep);
    border-radius: 14px;
    margin-bottom: 14px;
    transition: transform var(--med) var(--ease);
}

.category-icon svg { width: 26px; height: 26px; }
.category-name { margin: 0 0 3px; font-family: var(--font-display); font-weight: 600; font-size: 18px; color: var(--ink); }
.category-count {
    font: 600 10.5px var(--font-mono);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
}
.category-card .btn { width: 100%; margin-top: auto; }
.category-card .category-filter-btn { margin-top: 16px; }

/* --------------------------------------------------------------------------
   Explore controls
   -------------------------------------------------------------------------- */
.filter-controls-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 24px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    box-shadow: var(--s1);
    padding: 10px 14px;
}
.category-pills { display: flex; flex-wrap: wrap; gap: 6px; }
.pill {
    padding: 8px 14px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--r-full);
    font: 600 13px var(--font-body);
    color: var(--ink-2);
    cursor: pointer;
    transition: background-color var(--fast) var(--ease), color var(--fast) var(--ease);
}
.pill:hover { background: var(--surface-2); color: var(--ink); }
.pill.active { background: var(--cobalt); color: #fff; }
.sort-wrapper { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); }
.sort-select {
    padding: 7px 10px;
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: var(--r-sm);
    color: var(--ink);
    font: 500 13px var(--font-body);
    cursor: pointer;
}

/* --------------------------------------------------------------------------
   Article grid cards
   -------------------------------------------------------------------------- */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(258px, 1fr));
    gap: 18px;
}
.article-card {
    display: flex;
    flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    overflow: hidden;
    box-shadow: var(--s1);
    transition: transform var(--med) var(--ease), box-shadow var(--med) var(--ease), border-color var(--med) var(--ease);
    animation: card-rise 0.3s cubic-bezier(0.22, 1, 0.36, 1) backwards;
}

@keyframes card-rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

.card-topline { display: flex; align-items: center; justify-content: space-between; padding: 16px 16px 0; }
.card-icon-tile {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    background: var(--cobalt-tint);
    color: var(--cobalt-deep);
    border-radius: 11px;
}
.card-icon-tile svg { width: 22px; height: 22px; }
.bookmark-btn {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    background: transparent;
    border: 1px solid var(--line);
    border-radius: var(--r-full);
    color: var(--muted);
    cursor: pointer;
    transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease), background-color var(--fast) var(--ease), transform var(--fast) var(--ease);
}
.bookmark-btn:hover { color: var(--gold-fill); border-color: var(--gold-fill); }
.bookmark-btn svg { width: 16px; height: 16px; }
.bookmark-btn.active { color: var(--gold); border-color: var(--gold); background: color-mix(in srgb, var(--gold) 10%, transparent); }
.bookmark-btn.active svg { fill: currentColor; }
.bookmark-btn:active { transform: scale(0.92); }

.card-content { padding: 12px 18px 18px; display: flex; flex-direction: column; flex: 1; }
.card-content .category-tag { align-self: flex-start; }
.card-title {
    margin: 8px 0 7px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 20px;
    line-height: 1.2;
    letter-spacing: -0.01em;
    color: var(--ink);
}
.card-snippet { margin: 0; color: var(--muted); font-size: 13.5px; line-height: 1.6; flex: 1; }
.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-top: 1px solid var(--line);
}
.card-readtime { font: 600 10.5px var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.read-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--cobalt-tint);
    color: var(--cobalt-deep);
    border: none;
    border-radius: 8px;
    padding: 7px 12px;
    font: 600 13px var(--font-body);
    cursor: pointer;
    transition: background-color var(--fast) var(--ease), color var(--fast) var(--ease), transform var(--fast) var(--ease);
}
.read-link:hover { background: var(--cobalt); color: #fff; }
.read-link svg { width: 13px; height: 13px; transition: transform var(--fast) var(--ease); }

/* --------------------------------------------------------------------------
   Article reader
   -------------------------------------------------------------------------- */
.article-section { padding-bottom: 60px; }
.article-container {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 312px;
    gap: clamp(28px, 4vw, 52px);
    align-items: start;
}
.article-main { max-width: 780px; }

.article-kicker { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.article-category-badge {
    display: inline-block;
    padding: 4px 10px;
    background: var(--cobalt-tint);
    color: var(--cobalt-deep);
    font: 700 10.5px var(--font-mono);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border-radius: var(--r-full);
}
.article-readtime { font: 600 11px var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }

.article-main-title {
    margin: 0;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(34px, 4.6vw, 52px);
    line-height: 1.06;
    letter-spacing: -0.02em;
    color: var(--ink);
}
.article-subtitle { margin: 10px 0 0; color: var(--muted); font-size: 14.5px; }
.article-divider { border: 0; border-top: 1px solid var(--line); margin: 22px 0 26px; }

.article-lead {
    font-family: var(--font-display);
    font-size: 19.5px;
    line-height: 1.75;
    color: var(--ink-2);
    margin-bottom: 26px;
}
.article-lead p { margin: 0 0 12px; }
.article-lead strong { color: var(--ink); font-weight: 600; }

/* TOC */
.toc-container {
    display: inline-block;
    min-width: 260px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-left: 3px solid var(--cobalt);
    border-radius: var(--r-md);
    box-shadow: var(--s1);
    padding: 16px 20px 14px;
    margin: 4px 0 30px;
}
.toc-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.toc-title {
    font: 700 11.5px var(--font-mono);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--muted);
}
.toc-toggle-btn {
    background: none;
    border: none;
    color: var(--cobalt);
    font: 700 11.5px var(--font-mono);
    cursor: pointer;
    padding: 2px 4px;
    border-radius: 4px;
}
.toc-list {
    list-style: none;
    margin: 0;
    padding: 0;
    counter-reset: toc;
}
.toc-list li { counter-increment: toc; margin: 0; }
.toc-list a {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 6px 6px 6px 0;
    font-size: 14.5px;
    color: var(--ink-2);
    border-radius: 6px;
    transition: color var(--fast) var(--ease), background-color var(--fast) var(--ease);
}
.toc-list a::before {
    content: counter(toc) ".";
    font: 600 11.5px var(--font-mono);
    color: var(--cobalt);
    min-width: 18px;
    text-align: right;
}
.toc-list a:hover { color: var(--cobalt); text-decoration: none; }
.toc-list a.active { color: var(--cobalt-deep); font-weight: 600; }
html.dark-theme .toc-list a.active { color: var(--cobalt); }

/* Chapters */
.article-chapter {
    margin: 0 0 40px;
    font-family: var(--font-display);
}
.article-chapter h2 {
    margin: 0 0 16px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 27px;
    letter-spacing: -0.01em;
    line-height: 1.2;
    color: var(--ink);
    padding-bottom: 8px;
    border-bottom: 1px solid var(--line);
}
/* Sources & References chapter */
.wiki-refs {
    margin: 6px 0 0;
    padding-left: 1.5em;
}
.wiki-refs > li {
    font-size: 14.5px;
    line-height: 1.65;
    color: var(--ink-2);
    margin-bottom: 10px;
}
.wiki-refs > li::marker {
    color: var(--muted);
    font-size: 0.88em;
}
.ref-jump {
    color: var(--cobalt);
    text-decoration: none;
    font-size: 0.78em;
    vertical-align: super;
    font-weight: 600;
    padding: 0 1px;
}
.ref-jump:hover { text-decoration: underline; text-underline-offset: 2px; }
.ref-ext {
    color: var(--cobalt);
    text-decoration: none;
    font-size: 0.9em;
    opacity: 0.65;
    margin-left: 2px;
}
.ref-ext:hover { opacity: 1; }
.refs-note {
    font-size: 13.5px;
    color: var(--muted);
    margin-top: 12px;
}
.refs-note a { color: var(--cobalt); text-decoration: underline; text-underline-offset: 2px; }

.article-chapter p, .article-chapter li {
    font-size: 17px;
    line-height: 1.8;
    color: var(--ink-2);
}
.article-chapter p { margin: 0 0 16px; }
.article-chapter strong { color: var(--ink); font-weight: 600; }
.article-chapter ul, .article-chapter ol { margin: 0 0 18px; padding-left: 24px; }
.article-chapter ul li { margin-bottom: 8px; }
.references-list li { font-size: 14.5px; line-height: 1.7; color: var(--muted); margin-bottom: 10px; }
.references-list em { color: var(--ink-2); }

/* Infobox sidebar */
.article-sidebar {
    position: sticky;
    top: calc(var(--header-h) + 20px);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    box-shadow: var(--s1);
    overflow: hidden;
}
.infobox-header { text-align: center; padding: 20px 18px 14px; }
.infobox-header h3 { margin: 0; font-family: var(--font-display); font-weight: 600; font-size: 21px; color: var(--ink); line-height: 1.2; }
.infobox-subtitle {
    display: block;
    margin-top: 4px;
    font: 600 10.5px var(--font-mono);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
}
.infobox-image-placeholder {
    display: grid;
    place-items: center;
    height: 150px;
    margin: 0 18px 6px;
    background:
        radial-gradient(circle at 50% 40%, var(--cobalt-tint-2), transparent 70%),
        var(--surface-2);
    border: 1px solid var(--line);
    border-radius: var(--r-sm);
    color: var(--cobalt-deep);
}
.infobox-icon svg { width: 58px; height: 58px; }
.infobox-table { width: 100%; border-collapse: collapse; }
.infobox-table th, .infobox-table td {
    text-align: left;
    vertical-align: top;
    padding: 11px 16px;
    border-top: 1px solid var(--line);
    font-size: 13px;
}
.infobox-table tr:first-child th, .infobox-table tr:first-child td { border-top: none; }
.infobox-table th { width: 38%; font: 600 10.5px var(--font-mono); letter-spacing: 0.07em; text-transform: uppercase; color: var(--muted); padding-top: 13px; }
.infobox-table td { color: var(--ink-2); line-height: 1.55; }

/* --------------------------------------------------------------------------
   About
   -------------------------------------------------------------------------- */
.about-section { padding: 34px 0 90px; }
.about-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-lg);
    box-shadow: var(--s1);
    padding: clamp(28px, 5vw, 52px);
}
.about-title {
    margin: 0 0 14px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(28px, 3.4vw, 38px);
    letter-spacing: -0.015em;
    color: var(--ink);
}
.about-lead { margin: 0 0 12px; font-size: 16.5px; line-height: 1.75; color: var(--ink-2); }
.about-content > p { margin: 0 0 10px; color: var(--ink-2); font-size: 15px; line-height: 1.7; }
.about-content > p:last-of-type { margin-bottom: 0; }
.about-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 14px;
    margin-top: 30px;
    padding-top: 26px;
    border-top: 1px solid var(--line);
}
.feature-item {
    background: var(--surface-2);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    padding: 20px;
}
.feature-icon {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    background: var(--cobalt-tint);
    color: var(--cobalt-deep);
    border-radius: 11px;
    margin-bottom: 13px;
}
.feature-icon svg { width: 21px; height: 21px; }
.feature-item h4 { margin: 0 0 6px; font-size: 15.5px; font-weight: 700; color: var(--ink); }
.feature-item p { margin: 0; font-size: 13.5px; line-height: 1.6; color: var(--muted); }

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
    border-top: 1px solid var(--line);
    background: var(--surface);
    padding-top: 54px;
}
.footer-container {
    display: grid;
    grid-template-columns: 1.9fr 1fr 1fr 1.3fr;
    gap: clamp(24px, 4vw, 48px);
    padding-bottom: 44px;
}
.footer-logo { display: flex; align-items: center; gap: 9px; margin-bottom: 12px; }
.footer-logo .logo-icon { color: var(--cobalt); }
.footer-logo .logo-icon svg { width: 23px; height: 23px; }
.footer-title { font-family: var(--font-display); font-weight: 700; font-size: 21px; letter-spacing: -0.02em; color: var(--ink); }
.footer-desc { margin: 0 0 16px; max-width: 300px; font-size: 13.5px; line-height: 1.65; color: var(--muted); }
.challenge-notice {
    display: inline-block;
    padding: 6px 12px;
    background: var(--cobalt-tint);
    color: var(--cobalt-deep);
    border-radius: var(--r-full);
    font: 700 10.5px var(--font-mono);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}
html.dark-theme .challenge-notice { color: var(--cobalt); }
.footer-col h4 {
    margin: 4px 0 16px;
    font: 700 11px var(--font-mono);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--muted);
}
.footer-links { list-style: none; margin: 0; padding: 0; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { font-size: 14px; color: var(--ink-2); transition: color var(--fast) var(--ease); }
.footer-links a:hover { color: var(--cobalt); }
.footer-text-sm { margin: 0 0 10px; font-size: 13.5px; line-height: 1.6; color: var(--muted); }
.footer-bottom {
    border-top: 1px solid var(--line);
    background: var(--surface-2);
    padding: 18px 0;
    font-size: 12.5px;
    color: var(--muted);
}
.footer-bottom-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.footer-bottom p { margin: 0; }
.footer-subtext { color: var(--muted); }

/* --------------------------------------------------------------------------
   Search modal
   -------------------------------------------------------------------------- */
.search-modal {
    position: fixed;
    inset: 0;
    display: none;
    place-items: center;
    background: rgba(7, 11, 22, 0.55);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
    z-index: 2000;
    padding: 20px;
}
.search-modal.show { display: grid; }
.search-modal-content {
    width: min(620px, 100%);
    max-height: min(78vh, 640px);
    overflow-y: auto;
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: 18px;
    box-shadow: var(--s3);
    animation: modal-pop 0.24s var(--ease);
}
@keyframes modal-pop { from { opacity: 0; transform: translateY(-8px) scale(0.985); } to { opacity: 1; transform: none; } }
.search-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 18px 22px;
    border-bottom: 1px solid var(--line);
}
.search-modal-header h3 { margin: 0; font-size: 15.5px; font-weight: 600; color: var(--ink); }
.search-modal-header h3 span { color: var(--cobalt-deep); font-style: italic; }
html.dark-theme .search-modal-header h3 span { color: var(--cobalt); }
.close-modal-btn {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border: none;
    border-radius: var(--r-full);
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    transition: color var(--fast) var(--ease), background-color var(--fast) var(--ease);
}
.close-modal-btn:hover { background: var(--surface-2); color: var(--ink); }
.close-modal-btn svg { width: 15px; height: 15px; }
.modal-results-list { padding: 8px; }
.modal-results-list .search-result-item { padding: 14px 16px; border-radius: 10px; }
.modal-results-list .result-title { font-size: 15.5px; }
.modal-results-list .result-snippet { font-size: 13px; }
.modal-results-list > p { padding: 26px 18px; text-align: center; color: var(--muted); font-size: 14.5px; margin: 0; }

/* --------------------------------------------------------------------------
   Input placeholders
   -------------------------------------------------------------------------- */
::placeholder { color: var(--muted); opacity: 1; }
.search-input-wrapper input:focus-visible, .hero-search-box input:focus-visible { outline: none; }
.search-input-wrapper:focus-within, .hero-search-box:focus-within { outline: none; }

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
    .article-container { grid-template-columns: minmax(0, 1fr); }
    .article-main { max-width: 100%; }
    .article-sidebar { position: static; width: 100%; }
    .footer-container { grid-template-columns: 1fr 1fr; }
    .featured-body { grid-template-columns: 1fr; }
    .hero-stats { max-width: 560px; }
}

@media (max-width: 880px) {
    .header-container { gap: 14px; padding: 0 16px; }
    .header-search { display: none; }
    .header-actions { margin-left: auto; }
    .main-nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        display: none;
        background: var(--surface);
        border-bottom: 1px solid var(--line);
        box-shadow: var(--s2);
        padding: 12px 16px 16px;
    }
    .main-nav.show { display: block; }
    .nav-links { flex-direction: column; align-items: stretch; gap: 2px; }
    .nav-link { display: block; width: 100%; padding: 12px 10px; font-size: 16px; }
    .nav-link::after { display: none; }
    .mobile-menu-btn {
        display: inline-flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 5px;
        width: 40px;
        height: 40px;
        background: transparent;
        border: 1px solid var(--line);
        border-radius: var(--r-full);
        color: var(--ink-2);
        cursor: pointer;
        transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
    }
    .mobile-menu-btn:hover { color: var(--cobalt); border-color: var(--cobalt); }
    .mobile-menu-btn span { display: block; width: 17px; height: 2px; border-radius: 2px; background: currentColor; }
}

@media (max-width: 640px) {
    .container { width: 94%; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); }
    .hero-stats li + li { border-left: none; }
    .hero-stats li:nth-child(even) { border-left: 1px solid var(--line); }
    .hero-stats li:nth-child(n + 3) { border-top: 1px solid var(--line); }
    .featured-card { padding: 22px; }
    .featured-badge { position: static; align-self: flex-start; margin-bottom: 14px; }
    .featured-info { display: flex; flex-direction: column; align-items: flex-start; }
    .featured-topline { align-items: flex-start; }
    .categories-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-container { grid-template-columns: 1fr; }
    .about-card { padding: 26px 22px; }
    .footer-bottom-inner { justify-content: center; text-align: center; }
    .toc-container { width: 100%; }
}

/* --------------------------------------------------------------------------
   Small phones (375px): the catalog minimum. Tighten type + chrome so the
   editorial grid survives the narrowest supported viewport.
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
    .hero-title { font-size: clamp(34px, 11vw, 42px); }
    .hero-search-box { padding: 5px 5px 5px 13px; }
    .hero-stats strong { font-size: 22px; }
    .hero-stats li { padding: 13px 4px 12px; }
    .category-card { padding: 22px 12px 16px; }
    .article-card { padding: 20px 16px; }
    .section-title { font-size: clamp(24px, 7vw, 30px); }
    .featured-card { padding: 20px 16px; }
    .recent-chip { padding: 6px 12px; font-size: 12.5px; }
}

/* --------------------------------------------------------------------------
   Reduced motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        animation-delay: 0ms !important;
        transition-duration: 0.01ms !important;
    }
    html { scroll-behavior: auto; }
}

/* Dark-theme contrast: ink text on light cobalt surfaces */
html.dark-theme .btn-primary,
html.dark-theme .pill.active { color: #0B1526; }
html.dark-theme .search-btn:hover,
html.dark-theme .read-link:hover { color: #0B1526; }


/* --------------------------------------------------------------------------
   Interaction & motion craft
   Hover motion is reserved for devices that can actually hover (lift, shadow
   and arrow-slide live here so coarse pointers never see a stuck hover).
   Press feedback responds on pointer-down and is declared after hover so a
   pressed element always shows its pressed state, never the hover lift.
   -------------------------------------------------------------------------- */
@media (hover: hover) and (pointer: fine) {
    .btn-primary:hover { transform: translateY(-1px); }

    .popular-card:hover,
    .category-card:hover,
    .article-card:hover {
        transform: translateY(-3px);
        box-shadow: var(--s2);
        border-color: var(--cobalt);
    }
    .popular-card:hover .popular-icon { transform: translateY(-2px) scale(1.05); }
    .category-card:hover .category-icon { transform: scale(1.06); }
    .bookmark-btn:hover { transform: scale(1.08); }

    .read-link:hover svg { transform: translateX(3px); }
    .popular-card:hover .card-link svg { transform: translateX(3px); }

    .nav-link:hover::after { transform: scaleX(1); }
}

/* Press: respond the instant the pointer goes down, and beat any hover lift */
.btn-primary:active,
.btn:active { transform: translateY(0) scale(0.985); }
.popular-card:active,
.category-card:active,
.article-card:active { transform: translateY(0) scale(0.985); }
.popular-card:active .popular-icon,
.category-card:active .category-icon { transform: scale(0.97); }
.pill:active,
.recent-chip:active { transform: scale(0.96); }
.bookmark-btn:active { transform: scale(0.92); }
.read-link:active { transform: scale(0.97); }
.theme-toggle-btn:active,
.mobile-menu-btn:active,
.close-modal-btn:active { transform: scale(0.92); }
.nav-link:active { color: var(--cobalt-deep); }
.search-result-item:active { background: var(--surface-2); }
.text-btn:active { color: var(--cobalt); }

/* Smooth press/release easing for atoms that gained transform feedback */
.pill,
.recent-chip,
.theme-toggle-btn,
.mobile-menu-btn,
.close-modal-btn,
.read-link {
    transition-property: background-color, color, border-color, transform;
    transition-duration: var(--fast);
    transition-timing-function: var(--ease);
}

/* ==========================================================================
   V2 features: reading progress, surprise, reader tools, related topics,
   reading dashboard, toast, preview tooltip, print view
   ========================================================================== */

/* Reading progress bar (fixed, fills under the header) */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0%;
    background: linear-gradient(90deg, var(--cobalt), var(--accent, #6D28D9));
    z-index: 3000;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--med) var(--ease);
}
.reading-progress.visible { opacity: 1; }

/* Surprise button: matches the theme-toggle atom */
.surprise-btn {
    width: 40px;
    height: 40px;
    display: grid;
    place-items: center;
    background: var(--surface-2);
    border: 1px solid transparent;
    border-radius: var(--r-full);
    color: var(--ink-2);
    cursor: pointer;
    transition: color var(--fast) var(--ease), background-color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}
.surprise-btn svg { width: 18px; height: 18px; }
.surprise-btn:hover { color: var(--cobalt); border-color: var(--line-strong); }
.surprise-btn:active { transform: scale(0.9); }

/* Reader toolbar (font size + share/copy/print) */
.article-tools {
    display: flex;
    align-items: center;
    gap: 4px;
    margin: 2px 0 0;
    flex-wrap: wrap;
}
.article-tools-group { display: inline-flex; align-items: center; gap: 2px; }
.article-tools-sep { width: 1px; height: 18px; background: var(--line); margin: 0 8px; }
.tool-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-height: 30px;
    padding: 4px 10px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 7px;
    color: var(--ink-2);
    font: 600 13px var(--font-body);
    cursor: pointer;
    transition: color var(--fast) var(--ease), background-color var(--fast) var(--ease), border-color var(--fast) var(--ease), transform var(--fast) var(--ease);
}
.tool-btn svg { width: 15px; height: 15px; }
.tool-btn:hover { color: var(--cobalt); background: var(--cobalt-tint); }
.tool-btn:active { transform: scale(0.94); }
#font-minus, #font-plus { min-width: 34px; font-size: 13px; }

/* Reader font-size scaling: JS toggles a scale class on .article-main */
.article-main.reader-scale-0 { --reader-scale: 0.92; }
.article-main.reader-scale-1 { --reader-scale: 1; }
.article-main.reader-scale-2 { --reader-scale: 1.09; }
.article-main.reader-scale-3 { --reader-scale: 1.18; }
.article-main .article-body-content,
.article-main .article-lead { font-size: calc(1em * var(--reader-scale, 1)); }

/* Related topics / continue exploring */
.related-box {
    margin-top: 48px;
    padding-top: 34px;
    border-top: 1px solid var(--line);
}
.related-head { display: flex; align-items: baseline; justify-content: space-between; gap: 14px; flex-wrap: wrap; }
.related-head .eyebrow { display: block; margin-bottom: 6px; }
.related-head h2 { margin: 0; font-family: var(--font-display); font-weight: 600; font-size: clamp(22px, 2.4vw, 28px); color: var(--ink); }
.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
    gap: 14px;
    margin-top: 18px;
}
.related-card {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 16px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    box-shadow: var(--s1);
    cursor: pointer;
    text-align: left;
    font: inherit;
    color: inherit;
    transition: transform var(--med) var(--ease), box-shadow var(--med) var(--ease), border-color var(--med) var(--ease);
}
.related-card:hover { border-color: var(--cobalt); box-shadow: var(--s2); transform: translateY(-2px); }
.related-card .rc-cat { font: 600 10px var(--font-mono); letter-spacing: 0.09em; text-transform: uppercase; color: var(--cobalt); }
.related-card h4 { margin: 0; font-family: var(--font-display); font-weight: 600; font-size: 16.5px; line-height: 1.25; color: var(--ink); }
.related-card p { margin: 0; font-size: 13px; line-height: 1.5; color: var(--muted); }
.related-card .rc-go { display: inline-flex; align-items: center; gap: 5px; margin-top: auto; padding-top: 6px; font: 600 13px var(--font-body); color: var(--cobalt); }
.related-card .rc-go svg { width: 13px; height: 13px; transition: transform var(--fast) var(--ease); }
.related-card:hover .rc-go svg { transform: translateX(3px); }
.related-card .rc-live {
    position: absolute;
    top: 12px;
    right: 12px;
    font: 600 9.5px var(--font-mono);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
    border: 1px solid var(--line);
    padding: 2px 7px;
    border-radius: 999px;
}

/* Inline cross-links inside article text */
.article-xlink {
    color: var(--cobalt);
    text-decoration: underline;
    text-decoration-color: color-mix(in srgb, var(--cobalt) 40%, transparent);
    text-underline-offset: 3px;
    cursor: pointer;
    font-weight: 500;
}
.article-xlink:hover { text-decoration-color: var(--cobalt); }

/* Hover preview tooltip for cross-links + related cards */
.preview-tip {
    position: fixed;
    z-index: 4000;
    width: 260px;
    padding: 12px 14px;
    background: var(--surface);
    border: 1px solid var(--line-strong);
    border-radius: 10px;
    box-shadow: var(--s3);
    pointer-events: none;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity var(--fast) var(--ease), transform var(--fast) var(--ease);
}
.preview-tip.show { opacity: 1; transform: none; }
.preview-tip .pt-title { font: 600 14px var(--font-body); color: var(--ink); margin: 0 0 4px; }
.preview-tip .pt-desc { font-size: 12.5px; line-height: 1.45; color: var(--muted); margin: 0; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.preview-tip .pt-go { display: inline-flex; align-items: center; gap: 5px; margin-top: 8px; font: 600 12px var(--font-body); color: var(--cobalt); }
.preview-tip .pt-cat { font: 600 9.5px var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--cobalt); margin-top: 8px; display: block; }

/* Reading dashboard */
.reading-dashboard {
    margin-top: 22px;
    padding: 18px 20px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    box-shadow: var(--s1);
}
.rd-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.rd-head h3 { margin: 0; font-size: 14px; font-weight: 600; color: var(--ink-2); letter-spacing: 0.01em; }
.rd-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin: 0;
    padding: 14px 0;
    border-block: 1px solid var(--line);
}
.rd-cell { text-align: center; }
.rd-cell dt { font-family: var(--font-display); font-weight: 600; font-size: 26px; color: var(--cobalt); line-height: 1.1; }
.rd-cell dd { margin: 4px 0 0; font: 600 10.5px var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.rd-actions { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
.export-btn { border-color: var(--line); background: var(--surface-2); }

/* Toast */
.toast {
    position: fixed;
    bottom: 26px;
    left: 50%;
    transform: translate(-50%, 16px);
    background: var(--ink);
    color: var(--bg);
    padding: 11px 20px;
    border-radius: 999px;
    font: 600 13.5px var(--font-body);
    box-shadow: var(--s2);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--med) var(--ease), transform var(--med) var(--ease);
    z-index: 5000;
    max-width: min(92vw, 480px);
    text-align: center;
}
html.dark-theme .toast { background: var(--surface-3); color: var(--ink); border: 1px solid var(--line-strong); }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* Mobile tweaks */
@media (max-width: 480px) {
    .rd-stats { grid-template-columns: repeat(3, 1fr); gap: 6px; }
    .article-tools-sep { margin: 0 4px; }
    .related-box { margin-top: 34px; }
}

/* --------------------------------------------------------------------------
   Print view: only the open article prints
   -------------------------------------------------------------------------- */
@media print {
    body * { visibility: hidden !important; }
    #article, #article * { visibility: visible !important; }
    #article {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        margin: 0;
        padding: 0;
        box-shadow: none;
    }
    .article-sidebar, .article-tools, .toc-container, .related-box, .reading-progress { display: none !important; }
    .article-main { max-width: 100% !important; font-size: 11.5pt !important; }
}

/* --------------------------------------------------------------------------
   V2 live-wiki bits
   -------------------------------------------------------------------------- */
.wiki-divider {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 8px 6px 4px;
    font: 600 10px var(--font-mono);
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--muted);
}
.wiki-divider::after { content: ''; flex: 1; height: 1px; background: var(--line); }
.search-dropdown .wiki-divider { margin-top: 10px; padding-top: 8px; }
.infobox-thumb {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 10px;
    object-fit: cover;
    max-height: 150px;
}
.wiki-section-note { font-size: 13px; color: var(--muted); font-style: italic; }
.related-head .rc-out { text-decoration: none; border: 1px solid var(--line); }
#info-external-row a { color: var(--cobalt); }
.wiki-result { cursor: pointer; }


/* ==========================================================================
   15. V3 LIVE FEED  (on-this-day strip, news strip, live featured thumb)
   ========================================================================== */

/* Shared loading placeholder for live containers */
.featured-placeholder {
    color: var(--muted);
    font: 500 0.875rem/1.5 var(--font-body);
    letter-spacing: 0.01em;
    padding: 1.5rem 0;
    text-align: center;
}
.is-loading .featured-placeholder { padding: 2.5rem 0; }

/* Live featured thumbnail replaces the fact box */
.featured-thumb {
    width: 100%;
    height: 100%;
    min-height: 180px;
    object-fit: cover;
    border-radius: var(--r-md);
    display: block;
}

/* On this day: numbered editorial list */
.day-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.625rem;
}
.day-item {
    display: grid;
    grid-template-columns: 4.25rem 1fr auto;
    gap: 0.875rem;
    align-items: baseline;
    padding: 0.875rem 1rem;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    transition: border-color 140ms var(--ease);
}
.day-item:hover { border-color: var(--cobalt-tint); }
.day-year {
    font: 600 0.875rem/1.2 var(--font-mono);
    color: var(--cobalt);
    letter-spacing: 0.04em;
}
.day-text { font: 400 0.925rem/1.55 var(--font-body); color: var(--ink); }
.day-chips { display: inline-flex; gap: 0.375rem; flex-wrap: wrap; align-items: center; }

/* In the news */
.news-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.625rem;
}
.news-item {
    padding: 0.875rem 1rem;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    display: grid;
    gap: 0.5rem;
    transition: border-color 140ms var(--ease);
}
.news-item:hover { border-color: var(--cobalt-tint); }
.news-story { font: 400 0.925rem/1.55 var(--font-body); color: var(--ink); }
.news-story .recent-chip {
    display: inline-block;
    padding: 1px 8px;
    margin: 0 2px;
    font-size: 0.86em;
    line-height: 1.5;
    vertical-align: baseline;
    font-weight: 500;
}
.news-links {
    display: flex;
    gap: 0.875rem;
    flex-wrap: wrap;
    font-size: 0.85rem;
}
.news-links a {
    color: var(--cobalt);
    font-weight: 600;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 140ms var(--ease);
}
.news-links a:hover { border-bottom-color: currentColor; }

@media (max-width: 640px) {
    .day-item { grid-template-columns: 3.25rem 1fr; }
    .day-chips { grid-column: 2; }
}