/* MCA Notes Hub — VitePress-style theme.
 *
 * Same design language as shuhaibnc.github.io (VitePress default theme):
 * Inter, VitePress colour tokens, 64px top nav, pill brand buttons,
 * 12px feature cards, soft backgrounds. "Default" is the VitePress
 * default look: light, or dark when the OS prefers dark. The other
 * themes (AMOLED, Midnight, Forest, Catppuccin Mocha, Paper) come from
 * the same picker as the main site and share its storage key, so a
 * theme picked on either site follows the visitor to the other.
 * Dark "AMOLED" keeps the pure-black dark the hub had before.
 */

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('../fonts/inter-roman-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('../fonts/inter-roman-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  /* VitePress default (light) */
  --bg: #ffffff;
  --bg-soft: #f6f6f7;
  --card: #f6f6f7;
  --ink: #3c3c43;
  --muted: #67676c;
  --heading: #3c3c43;
  --line: #e2e2e3;
  --blue: #3451b2;
  --blue-d: #3a5ccc;
  --blue-soft: rgba(52, 81, 178, 0.14);
  --amber: #b45309;
  --green: #047857;
  --purple: #6d28d9;
  --red: #b91c1c;
  --header-bg: rgba(255, 255, 255, 0.96);
  --hover-bg: #f6f6f7;
  --search-bg: #f6f6f7;
  --tab-bg: #f6f6f7;
  --res-bg: #ffffff;
  --res-hover: #f6f6f7;
  --res-border: #e2e2e3;
  --about-bg: #ffffff;
  --radius: 12px;
  --btn-radius: 20px;
  color-scheme: light;
}

/* Default theme follows the OS, like VitePress. */
@media (prefers-color-scheme: dark) {
  :root[data-site-theme='default'] {
    --bg: #1b1b1f;
    --bg-soft: #202127;
    --card: #202127;
    --ink: #fffff5;
    --muted: #a0a0ab;
    --heading: #fffff5;
    --line: #2e2e32;
    --blue: #a8b1ff;
    --blue-d: #b9bfff;
    --blue-soft: rgba(168, 177, 255, 0.16);
    --amber: #f59e0b;
    --green: #4ade80;
    --purple: #c4b5fd;
    --red: #f87171;
    --header-bg: rgba(27, 27, 31, 0.96);
    --hover-bg: #202127;
    --search-bg: #202127;
    --tab-bg: #202127;
    --res-bg: #1b1b1f;
    --res-hover: #202127;
    --res-border: #2e2e32;
    --about-bg: #1b1b1f;
    color-scheme: dark;
  }
}

/* AMOLED — pure black (the hub's previous dark look, kept as-is). */
:root[data-site-theme='amoled'] {
  --bg: #000000;
  --bg-soft: #0d0d0d;
  --card: #0d0d0d;
  --ink: #f2f2f2;
  --muted: #a3a3a3;
  --heading: #f2f2f2;
  --line: #262626;
  --blue: #64b5f6;
  --blue-d: #42a5f5;
  --blue-soft: rgba(100, 181, 246, 0.14);
  --amber: #e8a13c;
  --green: #3ddc97;
  --purple: #b39dff;
  --red: #ff7b7b;
  --header-bg: rgba(0, 0, 0, 0.94);
  --hover-bg: #161616;
  --search-bg: #0d0d0d;
  --tab-bg: #0d0d0d;
  --res-bg: #0a0a0a;
  --res-hover: #171717;
  --res-border: #2b2b2b;
  --about-bg: #050505;
  color-scheme: dark;
}

/* Midnight — deep navy. */
:root[data-site-theme='midnight'] {
  --bg: #0a1128;
  --bg-soft: #0e1734;
  --card: #0e1734;
  --ink: #e6ebf5;
  --muted: #aab6d3;
  --heading: #e6ebf5;
  --line: #1e2a52;
  --blue: #7cb3ff;
  --blue-d: #5b9dff;
  --blue-soft: rgba(124, 179, 255, 0.14);
  --amber: #fbbf24;
  --green: #4ade80;
  --purple: #c4b5fd;
  --red: #f87171;
  --header-bg: rgba(10, 17, 40, 0.94);
  --hover-bg: #111c3d;
  --search-bg: #0d1530;
  --tab-bg: #0d1530;
  --res-bg: #0a1128;
  --res-hover: #111c3d;
  --res-border: #2a3a68;
  --about-bg: #0d1530;
  color-scheme: dark;
}

/* Forest — deep green. */
:root[data-site-theme='forest'] {
  --bg: #0a1a12;
  --bg-soft: #0e241a;
  --card: #0e241a;
  --ink: #e6f2ea;
  --muted: #a9c4b2;
  --heading: #e6f2ea;
  --line: #1e3d2c;
  --blue: #4ade80;
  --blue-d: #22c55e;
  --blue-soft: rgba(74, 222, 128, 0.14);
  --amber: #fbbf24;
  --green: #4ade80;
  --purple: #c4b5fd;
  --red: #f87171;
  --header-bg: rgba(10, 26, 18, 0.94);
  --hover-bg: #12291d;
  --search-bg: #0d2118;
  --tab-bg: #0d2118;
  --res-bg: #0a1a12;
  --res-hover: #12291d;
  --res-border: #2a5240;
  --about-bg: #0d2118;
  color-scheme: dark;
}

/* Catppuccin Mocha — warm dark, mauve accent. */
:root[data-site-theme='mocha'] {
  --bg: #1e1e2e;
  --bg-soft: #181825;
  --card: #181825;
  --ink: #cdd6f4;
  --muted: #a6adc8;
  --heading: #cdd6f4;
  --line: #313244;
  --blue: #cba6f7;
  --blue-d: #b48cf5;
  --blue-soft: rgba(203, 166, 247, 0.14);
  --amber: #f9e2af;
  --green: #a6e3a1;
  --purple: #cba6f7;
  --red: #f38ba8;
  --header-bg: rgba(30, 30, 46, 0.94);
  --hover-bg: #11111b;
  --search-bg: #181825;
  --tab-bg: #181825;
  --res-bg: #1e1e2e;
  --res-hover: #11111b;
  --res-border: #45475a;
  --about-bg: #181825;
  color-scheme: dark;
}

/* Paper — warm light. */
:root[data-site-theme='paper'] {
  --bg: #faf7f0;
  --bg-soft: #f3eee3;
  --card: #f3eee3;
  --ink: #2b2620;
  --muted: #7d7462;
  --heading: #2b2620;
  --line: #ddd5c2;
  --blue: #b45309;
  --blue-d: #92400e;
  --blue-soft: rgba(180, 83, 9, 0.14);
  --amber: #b45309;
  --green: #15803d;
  --purple: #6d28d9;
  --red: #b91c1c;
  --header-bg: rgba(250, 247, 240, 0.94);
  --hover-bg: #f3eee3;
  --search-bg: #fffdf7;
  --tab-bg: #fffdf7;
  --res-bg: #faf7f0;
  --res-hover: #f3eee3;
  --res-border: #cfc5ac;
  --about-bg: #fffdf7;
  color-scheme: light;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 24px;
  font-size: 16px;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: var(--blue); text-decoration: none; }
.wrap { max-width: 1152px; margin: 0 auto; padding: 0 24px; }

/* header — VitePress top nav */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--header-bg);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; height: 64px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 16px; color: var(--heading); letter-spacing: -0.01em; }
.brand-mark {
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--blue); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 16px;
}
.brand small { display: block; font-size: 11px; font-weight: 500; color: var(--muted); letter-spacing: 0.08em; text-transform: uppercase; }
.nav { margin-left: auto; display: flex; gap: 4px; }
.nav a { padding: 6px 12px; border-radius: 8px; color: var(--muted); font-weight: 500; font-size: 14px; }
.nav a:hover { background: var(--hover-bg); color: var(--heading); }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--blue); color: #fff; font-weight: 600; font-size: 14px;
  padding: 0 20px; line-height: 38px; border-radius: var(--btn-radius);
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
  transition: background-color 0.25s;
}
.btn:hover { background: var(--blue-d); }

/* theme picker (same picker as the main site, plain JS version) */
.theme-picker { position: relative; display: flex; align-items: center; flex: none; }
.theme-picker-btn {
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border: none; border-radius: 8px;
  background: transparent; color: var(--muted); cursor: pointer;
}
.theme-picker-btn:hover { color: var(--heading); background: var(--hover-bg); }
.theme-picker-btn svg { width: 20px; height: 20px; }
.theme-panel {
  position: absolute; top: calc(100% + 10px); right: 0;
  width: 304px; max-width: calc(100vw - 32px);
  max-height: calc(100vh - 80px); overflow-y: auto;
  padding: 16px; border: 1px solid var(--line); border-radius: 16px;
  background: var(--bg); box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
  z-index: 100; text-align: left;
}
.theme-panel[hidden] { display: none; }
.theme-panel-title {
  margin: 14px 0 8px; font-size: 12px; font-weight: 600;
  letter-spacing: 0.04em; text-transform: uppercase; color: var(--muted);
}
.theme-panel-title:first-child { margin-top: 0; }
.theme-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.theme-card {
  position: relative; display: flex; flex-direction: column; align-items: flex-start; gap: 2px;
  padding: 8px; border: 1px solid var(--line); border-radius: 10px;
  background: var(--bg-soft); color: var(--heading); cursor: pointer; text-align: left;
  font-family: inherit;
}
.theme-card.active { border-color: var(--blue); box-shadow: 0 0 0 1px var(--blue); }
.theme-swatch { position: relative; width: 100%; height: 28px; border-radius: 6px; border: 1px solid var(--line); }
.theme-swatch-dot {
  position: absolute; left: 6px; top: 50%; width: 10px; height: 10px;
  border-radius: 50%; background: var(--sw-accent, var(--blue)); transform: translateY(-50%);
}
.theme-name { font-size: 12px; font-weight: 600; line-height: 1.3; }
.theme-desc { font-size: 11px; line-height: 1.3; color: var(--muted); }
.theme-default-badge {
  position: absolute; top: 6px; right: 6px; padding: 1px 6px; border-radius: 999px;
  background: var(--blue-soft); color: var(--blue); font-size: 10px; font-weight: 700;
}
.accent-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.accent-swatch {
  width: 28px; height: 28px; padding: 0; border: 2px solid transparent; border-radius: 50%;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  color: var(--muted); background: var(--bg-soft); font-size: 13px;
}
.accent-swatch.active { border-color: var(--heading); box-shadow: 0 0 0 2px var(--bg), 0 0 0 3px var(--blue); }
.accent-custom {
  position: relative; width: 28px; height: 28px; border-radius: 50%;
  border: 1px dashed var(--line); display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--muted); font-size: 16px; overflow: hidden;
}
.accent-custom input { position: absolute; inset: -8px; opacity: 0; cursor: pointer; }
.seg-row { display: flex; gap: 6px; }
.seg-row button {
  flex: 1; padding: 7px 4px; border: 1px solid var(--line); border-radius: 8px;
  background: var(--bg-soft); color: var(--muted); font-size: 13px; cursor: pointer; font-family: inherit;
}
.seg-row button.active { border-color: var(--blue); background: var(--blue-soft); color: var(--blue); font-weight: 600; }
.theme-reset {
  width: 100%; margin-top: 16px; padding: 9px; border: 1px solid var(--line); border-radius: 9px;
  background: transparent; color: var(--heading); font-size: 13px; font-weight: 600; cursor: pointer; font-family: inherit;
}
.theme-reset:hover { border-color: var(--blue); }
.theme-note { margin: 10px 0 0; font-size: 12px; line-height: 1.5; color: var(--muted); }

/* hero — VitePress home hero */
.hero { background: var(--bg); color: var(--ink); padding: 64px 0 48px; position: relative; overflow: hidden; }
.hero h1 {
  font-size: clamp(32px, 5vw, 56px); line-height: 1.1; letter-spacing: -0.02em;
  font-weight: 700; margin-bottom: 16px; color: var(--heading);
}
.hero h1 span {
  background: linear-gradient(120deg, var(--blue) 20%, #8b7cff 80%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p { max-width: 640px; color: var(--muted); font-size: 18px; line-height: 28px; margin-bottom: 28px; }
@media (min-width: 640px) { .hero p { font-size: 20px; line-height: 30px; } }
@media (min-width: 960px) { .hero p { font-size: 24px; line-height: 36px; } }
.searchbar {
  display: flex; max-width: 620px; background: var(--search-bg);
  border: 1px solid var(--line); border-radius: var(--radius); padding: 6px;
}
.searchbar input {
  flex: 1; border: 0; outline: 0; font-size: 16px; padding: 12px 16px;
  border-radius: 10px; color: var(--ink); background: transparent; font-family: inherit;
}
.searchbar input::placeholder { color: var(--muted); }
.stats { display: flex; gap: 36px; margin-top: 34px; flex-wrap: wrap; }
.stat b { display: block; font-size: 30px; letter-spacing: -0.5px; color: var(--heading); }
.stat span { color: var(--muted); font-size: 13px; font-weight: 600; letter-spacing: 0.4px; text-transform: uppercase; }

/* sections */
.section { padding: 64px 0; }
.section-head { max-width: 720px; margin-bottom: 30px; }
.eyebrow { color: var(--blue); font-weight: 700; font-size: 13px; letter-spacing: 2px; text-transform: uppercase; margin-bottom: 8px; }
.section-head h2 { font-size: clamp(26px, 3.4vw, 32px); letter-spacing: -0.02em; line-height: 1.25; margin-bottom: 8px; color: var(--heading); }
.section-head p { color: var(--muted); font-size: 16px; }
.tabs { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 28px; }
.tab {
  border: 1px solid var(--line); background: var(--tab-bg); color: var(--ink);
  font-weight: 600; font-size: 14px; padding: 8px 18px; border-radius: 999px; cursor: pointer; font-family: inherit;
}
.tab:hover { border-color: var(--blue); }
.tab.active { background: var(--blue-soft); border-color: var(--blue); color: var(--blue); }
.tab small { opacity: 0.65; font-weight: 600; }

/* subject cards — VitePress feature cards */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); gap: 16px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; transition: border-color 0.25s;
}
.card:hover { border-color: var(--blue); }
.card h3 { font-size: 16px; line-height: 24px; font-weight: 600; color: var(--heading); margin-bottom: 4px; letter-spacing: -0.01em; }
.card .count { font-size: 13px; color: var(--muted); font-weight: 500; margin-bottom: 14px; display: block; }
.res-list { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.res-list a {
  display: flex; align-items: center; gap: 10px; padding: 8px 12px; border-radius: 8px;
  background: var(--res-bg); border: 1px solid var(--line); font-size: 14px; font-weight: 500; color: var(--ink);
}
.res-list a:hover { border-color: var(--blue); background: var(--res-hover); }
.res-list a .t { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.badge {
  flex: none; font-size: 12px; font-weight: 600; letter-spacing: 0.02em;
  padding: 2px 8px; border-radius: 4px;
  background: color-mix(in srgb, var(--blue) 14%, transparent); color: var(--blue);
}
.badge.qp { background: color-mix(in srgb, var(--amber) 14%, transparent); color: var(--amber); }
.badge.sy { background: color-mix(in srgb, var(--green) 14%, transparent); color: var(--green); }
.badge.lb { background: color-mix(in srgb, var(--purple) 14%, transparent); color: var(--purple); }
.badge.vd { background: color-mix(in srgb, var(--red) 14%, transparent); color: var(--red); }
.no-results { display: none; text-align: center; padding: 40px; color: var(--muted); font-size: 16px; }

/* about */
.about { background: var(--about-bg); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.about-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 40px; }
.about-grid p { color: var(--muted); margin-bottom: 14px; font-size: 16px; }
.facts { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.facts li { background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 18px; font-size: 14.5px; }
.facts b { color: var(--heading); }

/* footer — VitePress doc footer */
footer { background: var(--bg); color: var(--muted); padding: 44px 0 30px; border-top: 1px solid var(--line); }
.foot-grid { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; margin-bottom: 26px; }
.foot-grid h4 { color: var(--heading); margin-bottom: 10px; font-size: 15px; }
.foot-grid p, .foot-grid a { font-size: 14px; color: var(--muted); }
.foot-grid a:hover { color: var(--blue); }
.copyright {
  border-top: 1px solid var(--line); padding-top: 20px; font-size: 13.5px;
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
}
.copyright b { color: var(--heading); }
.header-cta { margin-left: 12px; }

/* customisation: font size, density, corners */
html[data-font-size='small'] body { font-size: 15px; }
html[data-font-size='large'] body { font-size: 18px; }
html[data-font-size='small'] .hero h1 { font-size: clamp(28px, 4.5vw, 48px); }
html[data-font-size='large'] .hero h1 { font-size: clamp(38px, 5.5vw, 64px); }
html[data-font-size='small'] .card h3 { font-size: 15px; }
html[data-font-size='large'] .card h3 { font-size: 18px; }
html[data-density='compact'] .card { padding: 16px; }
html[data-density='compact'] .cards { gap: 12px; }
html[data-density='compact'] .section { padding: 46px 0; }
html[data-radius='sharp'] { --radius: 4px; --btn-radius: 4px; }
html[data-radius='rounded'] { --radius: 20px; --btn-radius: 24px; }

@media (max-width: 760px) {
  .nav { display: none; }
  .site-header .wrap { gap: 10px; height: 60px; padding: 0 16px; }
  .brand { font-size: 16px; gap: 10px; }
  .brand-mark { width: 32px; height: 32px; font-size: 15px; border-radius: 8px; }
  .brand small { font-size: 10px; letter-spacing: 1px; }
  .header-cta { margin-left: auto; padding: 0 14px; font-size: 13.5px; }
  .cards { grid-template-columns: repeat(auto-fill, minmax(min(330px, 100%), 1fr)); }
  .stats { gap: 22px; }
  .about-grid { grid-template-columns: 1fr; }
  .section { padding: 46px 0; }
  .hero { padding: 56px 0 48px; }
}