/* Jet, Set, Go — base design system (tokens + components), copied from the App UX guide (styles.css). App-specific rules live in css/app.css. */
@font-face { font-family: "Plus Jakarta Sans"; font-style: normal; font-weight: 400 800; font-display: swap; src: url("../fonts/plus-jakarta-sans-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+20B9, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
/* ---------- tokens: light ---------- */
:root {
  color-scheme: light;
  --bg: #eceefb;
  --bg-2: #f7f5ff;
  --blob-1: rgba(167, 139, 250, 0.55);
  --blob-2: rgba(103, 232, 249, 0.45);
  --blob-3: rgba(249, 168, 212, 0.45);
  --blob-4: rgba(147, 197, 253, 0.55);
  --glass: linear-gradient(150deg, rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0.58));
  --glass-solid: rgba(250, 250, 255, 0.94);
  --card-bg: linear-gradient(150deg, rgba(255, 255, 255, 0.82), rgba(255, 255, 255, 0.62));
  --bar-bg: rgba(250, 250, 255, 0.84);
  --sheet-bg: rgba(248, 248, 255, 0.92);
  --table-solid: #f6f6fd;
  --glass-border: rgba(255, 255, 255, 0.85);
  --glass-hi: rgba(255, 255, 255, 0.9);
  --shadow: 0 24px 48px -28px rgba(49, 46, 129, 0.35), 0 2px 6px rgba(49, 46, 129, 0.05);
  --shadow-sm: 0 14px 30px -22px rgba(49, 46, 129, 0.5), 0 1px 3px rgba(49, 46, 129, 0.05);
  --surface: #f3f3fb;
  --ink: #15142b;
  --ink-2: #45435f;
  --ink-3: #5b5977;
  --hairline: rgba(21, 20, 43, 0.09);
  --grid: rgba(21, 20, 43, 0.08);
  --axis: rgba(21, 20, 43, 0.22);
  --field-bg: rgba(255, 255, 255, 0.6);
  --chip-bg: rgba(255, 255, 255, 0.7);
  --track: rgba(21, 20, 43, 0.1);
  --seg-active: #ffffff;
  --focus: rgba(124, 58, 237, 0.28);
  --notice-bg: rgba(250, 178, 25, 0.14);
  --notice-border: rgba(250, 178, 25, 0.35);
  --info-bg: rgba(124, 58, 237, 0.08);
  --accent-1: #6d28d9;
  --accent-2: #0891b2;
  --accent-grad: linear-gradient(135deg, #8b5cf6 0%, #3b82f6 55%, #06b6d4 100%);
  --btn-grad: linear-gradient(135deg, #7c3aed 0%, #2563eb 100%);
  --hero-ink: linear-gradient(180deg, #15142b 35%, #5b3fd6 100%);
  --good: #0ca30c;
  --ok-ink: #03694c;
  --ok-bg: rgba(5, 150, 105, 0.12);
  --warn-ink: #8a5a00;
  --warn-bg: rgba(245, 158, 11, 0.16);
  --danger: #b91c1c;

  /* Data colours. --rank1..5 (1st..5th choice, stacked bars) and the
     tighten/loosen diverging pair are validated palettes — re-checked
     against these surfaces with the dataviz validator, both themes pass.
     Marks use them directly; text beside them uses the *-ink steps,
     which clear 4.5:1 (the mark colours are only 3:1 graphics-safe). */
  --rank1: #2a78d6;
  --rank2: #008300;
  --rank3: #e87ba4;
  --rank4: #eda100;
  --rank5: #1baf7a;
  --move-tighten: #2a78d6;
  --move-loosen: #e34948;
  --tighten-ink: #1d5fb3;
  --loosen-ink: #b42318;

  /* Exam identity (which exam a rank belongs to), text-safe. */
  --kcet-ink: #8a5a00;
  --comedk-ink: #047857;

  --topbar-h: 65px;
  --sidebar-w: 254px;
  --sidebar-w-collapsed: 76px;
  --sticky-top: calc(var(--topbar-h) + env(safe-area-inset-top));
}

/* ---------- tokens: dark (system preference, unless the viewer picked light) ---------- */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0b0a1a;
    --bg-2: #171433;
    --blob-1: rgba(124, 58, 237, 0.3);
    --blob-2: rgba(6, 182, 212, 0.18);
    --blob-3: rgba(236, 72, 153, 0.18);
    --blob-4: rgba(79, 70, 229, 0.28);
    --glass: linear-gradient(150deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
    --glass-solid: rgba(28, 27, 51, 0.94);
    --card-bg: linear-gradient(150deg, rgba(255, 255, 255, 0.065), rgba(255, 255, 255, 0.03));
    --bar-bg: rgba(22, 20, 44, 0.84);
    --sheet-bg: rgba(24, 22, 46, 0.92);
    --table-solid: #221f3f;
    --glass-border: rgba(255, 255, 255, 0.13);
    --glass-hi: rgba(255, 255, 255, 0.14);
    --shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.7), 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-sm: 0 16px 32px -22px rgba(0, 0, 0, 0.8), 0 1px 4px rgba(0, 0, 0, 0.2);
    --surface: #1c1b33;
    --ink: #f4f3ff;
    --ink-2: #c6c4e2;
    --ink-3: #b8b6d6;
    --hairline: rgba(255, 255, 255, 0.1);
    --grid: rgba(255, 255, 255, 0.08);
    --axis: rgba(255, 255, 255, 0.24);
    --field-bg: rgba(255, 255, 255, 0.05);
    --chip-bg: rgba(255, 255, 255, 0.06);
    --track: rgba(255, 255, 255, 0.12);
    --seg-active: rgba(255, 255, 255, 0.14);
    --focus: rgba(167, 139, 250, 0.35);
    --notice-bg: rgba(250, 178, 25, 0.12);
    --notice-border: rgba(250, 178, 25, 0.3);
    --info-bg: rgba(167, 139, 250, 0.1);
    --accent-1: #b4a0fb;
    --accent-2: #22d3ee;
    --hero-ink: linear-gradient(180deg, #ffffff 30%, #c4b5fd 100%);
    --ok-ink: #6ee7b7;
    --ok-bg: rgba(52, 211, 153, 0.13);
    --warn-ink: #fcd34d;
    --warn-bg: rgba(251, 191, 36, 0.14);
    --danger: #f87171;
    --rank1: #3987e5;
    --rank2: #008300;
    --rank3: #d55181;
    --rank4: #c98500;
    --rank5: #199e70;
    --move-tighten: #3987e5;
    --move-loosen: #e66767;
    --tighten-ink: #7cb3f5;
    --loosen-ink: #f59494;
    --kcet-ink: #f2b544;
    --comedk-ink: #34d399;
  }
}

/* ---------- tokens: dark (explicit toggle) ---------- */
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b0a1a;
  --bg-2: #171433;
  --blob-1: rgba(124, 58, 237, 0.3);
  --blob-2: rgba(6, 182, 212, 0.18);
  --blob-3: rgba(236, 72, 153, 0.18);
  --blob-4: rgba(79, 70, 229, 0.28);
  --glass: linear-gradient(150deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  --glass-solid: rgba(28, 27, 51, 0.94);
  --card-bg: linear-gradient(150deg, rgba(255, 255, 255, 0.065), rgba(255, 255, 255, 0.03));
  --bar-bg: rgba(22, 20, 44, 0.84);
  --sheet-bg: rgba(24, 22, 46, 0.92);
  --table-solid: #221f3f;
  --glass-border: rgba(255, 255, 255, 0.13);
  --glass-hi: rgba(255, 255, 255, 0.14);
  --shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.7), 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-sm: 0 16px 32px -22px rgba(0, 0, 0, 0.8), 0 1px 4px rgba(0, 0, 0, 0.2);
  --surface: #1c1b33;
  --ink: #f4f3ff;
  --ink-2: #c6c4e2;
  --ink-3: #b8b6d6;
  --hairline: rgba(255, 255, 255, 0.1);
  --grid: rgba(255, 255, 255, 0.08);
  --axis: rgba(255, 255, 255, 0.24);
  --field-bg: rgba(255, 255, 255, 0.05);
  --chip-bg: rgba(255, 255, 255, 0.06);
  --track: rgba(255, 255, 255, 0.12);
  --seg-active: rgba(255, 255, 255, 0.14);
  --focus: rgba(167, 139, 250, 0.35);
  --notice-bg: rgba(250, 178, 25, 0.12);
  --notice-border: rgba(250, 178, 25, 0.3);
  --info-bg: rgba(167, 139, 250, 0.1);
  --accent-1: #b4a0fb;
  --accent-2: #22d3ee;
  --hero-ink: linear-gradient(180deg, #ffffff 30%, #c4b5fd 100%);
  --ok-ink: #6ee7b7;
  --ok-bg: rgba(52, 211, 153, 0.13);
  --warn-ink: #fcd34d;
  --warn-bg: rgba(251, 191, 36, 0.14);
  --danger: #f87171;
  --rank1: #3987e5;
  --rank2: #008300;
  --rank3: #d55181;
  --rank4: #c98500;
  --rank5: #199e70;
  --move-tighten: #3987e5;
  --move-loosen: #e66767;
  --tighten-ink: #7cb3f5;
  --loosen-ink: #f59494;
  --kcet-ink: #f2b544;
  --comedk-ink: #34d399;
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--sticky-top) + 12px);
}
html.modal-open { overflow: hidden; }
body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  font-family: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
  /* long file names in source notes must wrap, not push the page sideways */
  overflow-wrap: break-word;
}
h1, h2, h3, p { margin: 0; }
button, input, select { font: inherit; color: inherit; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--accent-1); outline-offset: 2px; }
/* `hidden` must win over class-level display: flex/grid */
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* inline SVG sprite (js/icons.js): <svg class="i"><use href="#i-name"/></svg> */
.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.i {
  width: 1em;
  height: 1em;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  vertical-align: -0.125em;
}

/* ---------- moving backdrop ---------- */
.backdrop {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background: radial-gradient(120% 70% at 50% -10%, var(--bg-2), var(--bg) 65%);
}
.blob {
  position: absolute;
  width: 75vmax;
  height: 75vmax;
  border-radius: 50%;
  background: radial-gradient(closest-side, var(--c), transparent 72%);
  will-change: transform;
  animation: drift 28s ease-in-out infinite alternate;
}
.b1 { --c: var(--blob-1); top: -30vmax; left: -25vmax; }
.b2 { --c: var(--blob-2); top: 5vh; right: -35vmax; animation-duration: 34s; animation-delay: -9s; }
.b3 { --c: var(--blob-3); bottom: -35vmax; left: -15vmax; animation-duration: 38s; animation-delay: -15s; }
.b4 { --c: var(--blob-4); bottom: -25vmax; right: -25vmax; animation-duration: 31s; animation-delay: -4s; }
@keyframes drift {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(7vmax, 5vmax, 0) scale(1.08); }
  100% { transform: translate3d(-5vmax, 9vmax, 0) scale(0.94); }
}
.grain {
  position: absolute;
  inset: 0;
  opacity: 0.06;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- glass ----------
   Cards are translucent gradients WITHOUT backdrop blur: a blurred copy of
   the page behind a card costs GPU memory for its full height (the ranking
   and results tables run to tens of thousands of pixels), which stalled
   phones. Real blur is kept for the small fixed surfaces only: top bar,
   tab bar, desktop sidebar and the pop-up sheet. */
.glass {
  position: relative;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow), inset 0 1px 0 var(--glass-hi);
}
.card { border-radius: 24px; padding: 20px; }
.card-head { margin-bottom: 14px; }
.card-head h2, .card-title { display: flex; align-items: center; gap: 10px; font-size: 17px; font-weight: 800; letter-spacing: -0.015em; line-height: 1.3; }
.card-sub { margin-top: 4px; font-size: 13px; color: var(--ink-3); line-height: 1.5; }
.card-sub strong, .card-sub b { color: var(--ink-2); }
.card-icon { display: inline-grid; place-items: center; flex: none; width: 34px; height: 34px; border-radius: 11px; background: var(--chip-bg); border: 1px solid var(--hairline); color: var(--accent-1); }
.card-icon .i { width: 17px; height: 17px; }

/* ==========================================================================
   Top bar (phones & tablets)
   ========================================================================== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  height: calc(var(--topbar-h) + env(safe-area-inset-top));
  padding: calc(10px + env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) 10px max(16px, env(safe-area-inset-left));
  border-bottom: 1px solid transparent;
  transition: background 0.3s, border-color 0.3s;
}
.topbar.scrolled {
  background: var(--bar-bg);
  border-bottom-color: var(--glass-border);
  -webkit-backdrop-filter: blur(20px) saturate(170%);
  backdrop-filter: blur(20px) saturate(170%);
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; min-height: 44px; text-decoration: none; }
.brand-mark { width: 36px; height: 36px; flex: none; border-radius: 11px; box-shadow: 0 6px 18px -6px rgba(99, 102, 241, 0.6); }
.brand-text { display: flex; flex-direction: column; min-width: 0; line-height: 1.15; white-space: nowrap; }
.brand-text strong { font-size: 15px; font-weight: 800; letter-spacing: -0.01em; }
.brand-text span { font-size: 12px; color: var(--ink-2); font-weight: 600; overflow: hidden; text-overflow: ellipsis; }

.icon-btn {
  width: 42px;
  height: 42px;
  flex: none;
  display: grid;
  place-items: center;
  padding: 0;
  border-radius: 14px;
  border: 1px solid var(--glass-border);
  background: var(--glass);
  cursor: pointer;
  transition: transform 0.2s;
}
.icon-btn:active { transform: scale(0.94); }
.icon-btn .i { width: 20px; height: 20px; }
.i-moon { display: none; }
:root[data-effective="light"] .i-sun { display: none; }
:root[data-effective="light"] .i-moon { display: block; }

/* ==========================================================================
   App shell: sidebar (desktop) + content
   ========================================================================== */
.app-shell { display: block; }
.app-content { min-width: 0; }
.sidebar { display: none; }

/* ==========================================================================
   Bottom tab bar (phones & tablets)
   ========================================================================== */
.tabbar {
  background: var(--bar-bg);
  -webkit-backdrop-filter: blur(20px) saturate(170%);
  backdrop-filter: blur(20px) saturate(170%);
  position: fixed;
  left: 50%;
  bottom: calc(12px + env(safe-area-inset-bottom));
  z-index: 30;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 4px;
  width: min(480px, calc(100% - 24px));
  padding: 6px;
  border-radius: 24px;
  transform: translateX(-50%);
}
.tabbar:empty { display: none; }
.tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  min-width: 0;
  min-height: 52px;
  padding: 8px 4px 7px;
  border-radius: 18px;
  color: var(--ink-3);
  font-size: 11.5px;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  touch-action: manipulation;
  transition: background 0.2s, color 0.2s, transform 0.15s;
}
.tab span { max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tab .i { width: 22px; height: 22px; }
.tab:hover { color: var(--ink); }
.tab:active { transform: scale(0.96); }
.tab[aria-current="page"] { background: var(--seg-active); color: var(--ink); box-shadow: 0 2px 10px -3px rgba(15, 12, 40, 0.3); }
.tab[aria-current="page"] .i { color: var(--accent-1); }
@media (max-width: 359px) { .tab { padding-inline: 2px; font-size: 10.5px; letter-spacing: -0.01em; } }

/* ==========================================================================
   Layout + page intro
   ========================================================================== */
.layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 6px max(16px, env(safe-area-inset-right)) calc(112px + env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
}
.stack { display: grid; grid-template-columns: minmax(0, 1fr); gap: 16px; min-width: 0; }
.stack > * { min-width: 0; }

.intro { padding: 10px 2px 20px; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: 100%;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--chip-bg);
  border: 1px solid var(--glass-border);
  color: var(--ink-2);
}
.pulse { position: relative; width: 8px; height: 8px; flex: none; border-radius: 50%; background: var(--good); }
.pulse::after { content: ""; position: absolute; inset: 0; border-radius: 50%; background: var(--good); opacity: 0.5; animation: pulse 2.4s infinite; }
@keyframes pulse { 70%, 100% { transform: scale(3); opacity: 0; } }
h1 {
  margin-top: 14px;
  font-size: clamp(28px, 7.6vw, 44px);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -0.035em;
  background: var(--hero-ink);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  padding-bottom: 0.06em;
  overflow-wrap: anywhere;
}
.lede { margin-top: 10px; font-size: 15px; color: var(--ink-2); max-width: 44em; }
.intro-controls { display: grid; gap: 12px; margin-top: 18px; justify-items: start; }
.intro-controls:empty { display: none; }

/* Home-page hero art: a short wide banner above the heading on phones,
   beside the heading from 760px (the <picture> swaps in the taller art). */
.hero-art { display: block; margin: -4px -8px 8px; }
.hero-art img { display: block; width: 100%; height: auto; }
@media (min-width: 760px) {
  /* text block centred against the art: flexible rows above and below */
  .intro.has-hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(260px, 42%); grid-template-rows: 1fr repeat(4, auto) 1fr; column-gap: 32px; }
  .intro.has-hero > * { grid-column: 1; }
  .intro.has-hero > .eyebrow { grid-row: 2; justify-self: start; }
  .intro.has-hero > h1 { grid-row: 3; }
  .intro.has-hero > .lede { grid-row: 4; }
  .intro.has-hero > .intro-controls { grid-row: 5; }
  .intro.has-hero > .hero-art { grid-column: 2; grid-row: 1 / -1; align-self: center; margin: 0; }
}
@media (min-width: 1000px) {
  .intro.has-hero { grid-template-columns: minmax(0, 1fr) minmax(300px, 400px); }
}

/* ==========================================================================
   Segmented control (links or buttons) — exam choice, view toggle, toggles
   ========================================================================== */
.seg {
  display: inline-flex;
  max-width: 100%;
  padding: 3px;
  border-radius: 14px;
  border: 1px solid var(--glass-border);
  background: var(--glass);
}
.seg > a, .seg > button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 40px;
  padding: 0 14px;
  border: 0;
  border-radius: 11px;
  background: none;
  color: var(--ink-3);
  font-size: 13.5px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.seg > a:hover, .seg > button:hover { color: var(--ink); }
.seg > a[aria-current="page"],
.seg > button[aria-pressed="true"] { background: var(--seg-active); color: var(--ink); box-shadow: 0 2px 8px -2px rgba(15, 12, 40, 0.25); }
.seg .i { width: 18px; height: 18px; }
/* exam choice only on phones/tablets — desktop has it in the sidebar */
.exam-seg { width: 100%; max-width: 420px; }
.exam-seg:empty { display: none; }
.exam-seg > a { flex: 1 1 0; min-width: 0; }

/* in-card segmented control (field surface, no blur) */
.seg.seg-field { background: var(--field-bg); border-color: var(--hairline); }

/* ==========================================================================
   Round switch (tabs with status badge)
   ========================================================================== */
.round-switch { display: flex; flex-wrap: wrap; gap: 8px; }
.round-switch:empty { display: none; }
.round-tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 0 12px 0 14px;
  border-radius: 999px;
  border: 1px solid var(--hairline);
  background: var(--chip-bg);
  color: var(--ink-2);
  font-size: 13.5px;
  font-weight: 700;
  white-space: nowrap;
  cursor: pointer;
  touch-action: manipulation;
  transition: background 0.2s, color 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.round-tab:hover { color: var(--ink); border-color: var(--accent-1); }
.round-tab.active {
  background: var(--seg-active);
  color: var(--ink);
  border-color: var(--accent-1);
  box-shadow: 0 0 0 3px var(--focus), 0 4px 12px -6px rgba(79, 70, 229, 0.6);
}
.round-badge {
  font-size: 10.5px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--chip-bg);
  color: var(--ink-3);
}
.round-badge.official { background: var(--ok-bg); color: var(--ok-ink); }
.round-badge.mock { background: var(--info-bg); color: var(--accent-1); }
.round-badge.provisional { background: var(--warn-bg); color: var(--warn-ink); }
.round-badge.pending { background: transparent; color: var(--ink-3); box-shadow: inset 0 0 0 1px var(--hairline); }

/* pill toggles (JoSAA institute type) */
.exam-switch { display: flex; flex-wrap: wrap; gap: 8px; }
.exam-switch:empty { display: none; }
.exam-tab {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 40px;
  padding: 0 15px 0 12px;
  border-radius: 999px;
  border: 1px solid var(--hairline);
  background: var(--chip-bg);
  color: var(--ink-2);
  font-size: 13.5px;
  font-weight: 700;
  white-space: nowrap;
  cursor: pointer;
  touch-action: manipulation;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.15s;
}
.exam-tab .i { width: 17px; height: 17px; }
.exam-tab:hover { color: var(--ink); border-color: var(--accent-1); }
.exam-tab:active { transform: scale(0.96); }
.exam-tab.active { color: #fff; background: var(--btn-grad); border-color: transparent; box-shadow: 0 8px 20px -10px rgba(79, 70, 229, 0.8); }

/* ==========================================================================
   Buttons & chips
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 14px;
  border: 1px solid transparent;
  font-size: 14.5px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  touch-action: manipulation;
  transition: transform 0.15s, box-shadow 0.2s, filter 0.2s;
}
.btn:active { transform: scale(0.97); }
.btn .i { width: 18px; height: 18px; }
.btn-primary { color: #fff; background: var(--btn-grad); box-shadow: 0 10px 24px -10px rgba(79, 70, 229, 0.8); }
.btn-primary:hover { filter: brightness(1.07); }
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 44px;
  padding: 0 16px;
  border-radius: 14px;
  border: 1px solid var(--hairline);
  background: var(--chip-bg);
  color: var(--ink-2);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
  transition: border-color 0.2s, color 0.2s, transform 0.15s;
}
.btn-ghost:hover { border-color: var(--accent-1); color: var(--ink); }
.btn-ghost:active { transform: scale(0.97); }

.chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 44px;
  padding: 0 16px 0 14px;
  border-radius: 999px;
  border: 1px solid var(--hairline);
  background: var(--chip-bg);
  color: var(--ink-2);
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
  cursor: pointer;
  touch-action: manipulation;
  transition: background 0.2s, color 0.2s, border-color 0.2s, box-shadow 0.2s, transform 0.15s;
}
.chip .i { width: 17px; height: 17px; }
.chip:hover:not([disabled]) { border-color: var(--accent-1); color: var(--ink); }
.chip:active:not([disabled]) { transform: scale(0.96); }
.chip[disabled] { opacity: 0.45; cursor: not-allowed; }
.toggle-chip.active,
.toggle-chip[aria-pressed="true"] { color: #fff; background: var(--btn-grad); border-color: transparent; box-shadow: 0 8px 20px -10px rgba(79, 70, 229, 0.8); }
/* touch screens keep :hover after a tap — don't let it grey out a pressed chip */
.chip.toggle-chip.active:hover,
.chip.toggle-chip[aria-pressed="true"]:hover { color: #fff; border-color: transparent; }

.link-btn { border: 0; background: none; padding: 4px 0; font-size: 13px; font-weight: 700; color: var(--accent-1); cursor: pointer; }

/* ==========================================================================
   Form controls — every field ≥ 16px so iOS never zooms on focus
   ========================================================================== */
.field { display: grid; gap: 6px; min-width: 0; }
.field > label, .field-label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-3);
}

select, .sort-select {
  width: 100%;
  min-width: 0;
  height: 48px;
  padding: 0 40px 0 14px;
  border-radius: 14px;
  border: 1px solid var(--hairline);
  background-color: var(--field-bg);
  background-image: linear-gradient(45deg, transparent 50%, currentColor 50%), linear-gradient(135deg, currentColor 50%, transparent 50%);
  background-position: right 20px center, right 15px center;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  color: var(--ink);
  font-size: 16px;
  font-weight: 600;
  text-overflow: ellipsis;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s;
}
select:hover { border-color: var(--accent-1); }
select:focus { outline: none; border-color: var(--accent-1); box-shadow: 0 0 0 4px var(--focus); }
select:disabled { opacity: 0.5; cursor: not-allowed; }
select option { background: var(--surface); color: var(--ink); }

/* search field: icon + input (+ native clear) */
.search-box {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  height: 48px;
  padding: 0 12px 0 14px;
  border-radius: 16px;
  border: 1px solid var(--hairline);
  background: var(--field-bg);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.search-box:focus-within { border-color: var(--accent-1); box-shadow: 0 0 0 4px var(--focus); }
.search-box > .i { width: 19px; height: 19px; color: var(--ink-3); }
.search-box input {
  flex: 1;
  min-width: 0;
  height: 100%;
  padding: 0;
  border: 0;
  outline: none;
  background: none;
  color: var(--ink);
  font-size: 16px;
  font-weight: 500;
}
.search-box input::placeholder { color: var(--ink-3); opacity: 0.85; }

/* large number field (rank inputs) */
.num-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  height: 60px;
  padding: 0 16px;
  border-radius: 18px;
  background: var(--field-bg);
  border: 1px solid var(--hairline);
  transition: border-color 0.2s, box-shadow 0.2s;
  cursor: text;
}
.num-wrap:focus-within { border-color: var(--accent-1); box-shadow: 0 0 0 4px var(--focus); }
.num-prefix { font-size: 22px; font-weight: 800; color: var(--ink-3); }
.num-wrap input {
  flex: 1;
  min-width: 0;
  padding: 0;
  border: 0;
  outline: none;
  background: none;
  color: var(--ink);
  height: 100%;
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.num-wrap input::placeholder { color: var(--ink-3); opacity: 0.5; font-weight: 700; }
.num-wrap input::-webkit-inner-spin-button,
.num-wrap input::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
.num-wrap input[type="number"] { -moz-appearance: textfield; appearance: textfield; }
.field-hint { margin-top: 6px; font-size: 12.5px; color: var(--ink-3); }

/* ==========================================================================
   Filters, stats bar, view toggle
   ========================================================================== */
.filters-panel { display: grid; gap: 12px; }
.search-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 10px; align-items: center; }
.search-row .search-box { grid-column: 1 / -1; }
.stats-bar { font-size: 13px; color: var(--ink-2); line-height: 1.5; }
.stats-bar:empty { display: none; }
.stats-bar strong { color: var(--ink); font-weight: 800; }

.view-toggle.seg { flex: none; }
.view-toggle.seg > button { min-width: 44px; padding: 0 12px; }

@media (min-width: 640px) {
  .search-row { grid-template-columns: minmax(0, 1fr) minmax(170px, 230px) auto; }
  .search-row .search-box { grid-column: auto; }
}

/* ==========================================================================
   Stat tiles
   ========================================================================== */
.stats-strip { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.stats-strip:empty { display: none; }
.stat-tile {
  min-width: 0;
  padding: 14px 16px;
  border-radius: 20px;
  border: 1px solid var(--glass-border);
  background: var(--card-bg);
  box-shadow: var(--shadow-sm), inset 0 1px 0 var(--glass-hi);
}
.stat-value { font-size: clamp(20px, 6.2vw, 24px); font-weight: 800; letter-spacing: -0.03em; line-height: 1.15; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.stat-label { margin-top: 2px; font-size: 12.5px; font-weight: 600; color: var(--ink-3); }
.stat-sub { margin-top: 2px; font-size: 12px; color: var(--ink-3); }
.stat-tile.accent .stat-value { background: var(--hero-ink); -webkit-background-clip: text; background-clip: text; color: transparent; }
@media (max-width: 359px) { .stat-tile { padding: 12px 13px; } }
@media (min-width: 720px) { .stats-strip { grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; } }

/* ==========================================================================
   Result cards (repeated — translucent gradient, never blurred)
   ========================================================================== */
.card-list { display: grid; grid-template-columns: minmax(0, 1fr); gap: 10px; }
@media (min-width: 860px) { .card-list { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; } }
@media (min-width: 1400px) { .card-list { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

.rcard {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  padding: 14px 14px 14px 16px;
  border-radius: 20px;
  border: 1px solid var(--glass-border);
  background: var(--card-bg);
  box-shadow: var(--shadow-sm), inset 0 1px 0 var(--glass-hi);
  transition: transform 0.18s, border-color 0.2s, opacity 0.2s;
}
.rcard.clickable { cursor: pointer; touch-action: manipulation; }
/* long result lists: off-screen cards/rows skip layout and paint */
.card-list > .rcard { content-visibility: auto; contain-intrinsic-size: auto 128px; }
.data-table tbody tr { content-visibility: auto; contain-intrinsic-size: auto 72px; }
.rcard.clickable:hover { border-color: var(--accent-1); }
.rcard.clickable:active { transform: scale(0.985); }
.rcard.eligible { border-color: var(--ok-ink); box-shadow: var(--shadow-sm), inset 0 0 0 1px var(--ok-ink); }
.rcard.not-eligible { opacity: 0.45; }
.rcard-left { flex: 1; min-width: 0; display: grid; gap: 4px; }
.rcard-top { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 8px; }
.rcard-college { font-size: 14.5px; font-weight: 700; line-height: 1.3; letter-spacing: -0.005em; overflow-wrap: anywhere; }
.rcard-branch { font-size: 12.5px; color: var(--ink-2); line-height: 1.4; overflow-wrap: anywhere; }
.code-chip {
  display: inline-flex;
  align-items: center;
  font-size: 11.5px;
  font-weight: 800;
  letter-spacing: 0.02em;
  padding: 2px 8px;
  border-radius: 8px;
  color: var(--accent-1);
  background: var(--info-bg);
  font-variant-numeric: tabular-nums;
}
.group-tag { font-size: 11.5px; font-weight: 700; color: var(--ink-3); }

/* big closing-rank figure on the right of a card */
.rank-pill {
  flex: none;
  min-width: 72px;
  padding: 10px 12px;
  border-radius: 14px;
  background: var(--chip-bg);
  border: 1px solid var(--hairline);
  color: var(--exam-ink, var(--ink));
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.02em;
  text-align: center;
  font-variant-numeric: tabular-nums;
}
:root[data-exam="kcet"] { --exam-ink: var(--kcet-ink); }
:root[data-exam="comedk"] { --exam-ink: var(--comedk-ink); }

/* round-over-round history trail (direction carried by colour AND the
   value going up/down, so colour is never the only cue) */
.cutoff-history { display: flex; flex-wrap: wrap; align-items: center; gap: 2px 4px; margin-top: 2px; font-size: 12px; font-variant-numeric: tabular-nums; color: var(--ink-3); }
.history-point.current { color: var(--ink); font-weight: 800; }
.history-arrow { font-weight: 800; }
.history-arrow.tighten { color: var(--tighten-ink); }
.history-arrow.loosen { color: var(--loosen-ink); }
.history-arrow.flat { color: var(--ink-3); }

/* ==========================================================================
   Engineering tracker (index.html): rank checker + results table
   ========================================================================== */
.rank-check-controls { display: grid; gap: 12px; }
.rank-check-actions { display: flex; gap: 10px; }
.rank-check-actions .chip { flex: 1; }
@media (min-width: 640px) {
  .rank-check-controls { grid-template-columns: minmax(0, 360px) auto; align-items: center; justify-content: start; }
  .rank-check-actions .chip { flex: none; }
}
.table-card { padding: 6px 16px; }
.t-code {
  display: inline-flex;
  margin-right: 8px;
  padding: 1px 7px;
  border-radius: 7px;
  font-size: 11.5px;
  font-weight: 800;
  color: var(--accent-1);
  background: var(--info-bg);
  vertical-align: 1px;
}
.results-table .t-college { font-weight: 700; line-height: 1.35; overflow-wrap: anywhere; }
.results-table .t-branch { grid-column: 1; font-size: 12.5px; color: var(--ink-2); overflow-wrap: anywhere; }
.results-table .t-rank { grid-column: 2; grid-row: 1 / span 2; align-self: center; font-size: 17px; font-weight: 800; color: var(--exam-ink, var(--ink)); }
.results-table tr.not-eligible { opacity: 0.45; }
.results-table tr.eligible .t-rank { color: var(--ok-ink); }
.results-table tr.eligible td:first-child { box-shadow: inset 3px 0 0 var(--ok-ink); padding-left: 10px; }
@container (min-width: 640px) {
  .results-table .t-branch { font-size: 13px; }
  .results-table .t-rank { font-size: 15px; }
}

/* ==========================================================================
   Data tables — mobile first: each row is a compact card; a wide
   container gets a real table whose header sticks below the top bar.
   Page CSS places cells into each table's card grid.
   ========================================================================== */
.table-wrap { container-type: inline-size; min-width: 0; }
.data-table { width: 100%; border-collapse: collapse; font-size: 13.5px; font-variant-numeric: tabular-nums; }
.data-table, .data-table tbody { display: block; }
.data-table thead { display: none; }
.data-table tr {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 14px;
  align-items: start;
  padding: 13px 4px;
  border-top: 1px solid var(--hairline);
}
.data-table tbody tr:first-child { border-top: 0; }
.data-table td { display: block; min-width: 0; padding: 0; }
.data-table tr.clickable { cursor: pointer; }
.data-table tr.clickable:hover td { color: var(--ink); }
/* a cell that labels itself in card mode */
.data-table .lbl::before, .data-table [data-l]::before {
  content: attr(data-l);
  display: block;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
  white-space: nowrap;
}
.data-table .empty-row { grid-column: 1 / -1; padding: 18px 0; text-align: center; color: var(--ink-3); font-style: italic; }

@container (min-width: 640px) {
  .data-table { display: table; }
  .data-table thead { display: table-header-group; }
  .data-table tbody { display: table-row-group; }
  .data-table tr { display: table-row; padding: 0; border: 0; }
  .data-table th, .data-table td {
    display: table-cell;
    padding: 10px 12px;
    text-align: left;
    vertical-align: top;
    border-bottom: 1px solid var(--hairline);
  }
  .data-table tbody tr:last-child td { border-bottom: 0; }
  .data-table thead th {
    position: sticky;
    top: var(--sticky-top);
    z-index: 2;
    font-size: 12px;
    font-weight: 700;
    color: var(--ink-2);
    background: var(--table-solid);
    white-space: nowrap;
  }
  .data-table thead th:first-child { border-top-left-radius: 14px; }
  .data-table thead th:last-child { border-top-right-radius: 14px; }
  .data-table .num, .data-table th.num { text-align: right; white-space: nowrap; }
  .data-table [data-l]::before, .data-table .lbl::before { content: none; }
  .data-table tr.clickable:hover td { background: color-mix(in srgb, var(--accent-1) 7%, transparent); }
  .data-table .empty-row { display: table-cell; }
}

/* ==========================================================================
   Notes, disclaimers, empty states
   ========================================================================== */
.notice {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 10px;
  padding: 13px 15px;
  border-radius: 16px;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--ink-2);
  background: var(--info-bg);
  border: 1px solid var(--hairline);
}
.notice > .i { width: 20px; height: 20px; margin-top: 1px; color: var(--accent-1); }
.notice > p, .card-sub { min-width: 0; overflow-wrap: anywhere; }
.notice b, .notice strong, .notice em { color: var(--ink); font-style: normal; font-weight: 700; }
.notice a { color: var(--accent-1); font-weight: 700; }
.notice.warn { background: var(--notice-bg); border-color: var(--notice-border); }
.notice.warn > .i { color: var(--warn-ink); }

.list-more { display: flex; width: 100%; margin-top: 12px; }
.list-more[hidden] { display: none; }

.no-results, .empty-state {
  display: grid;
  justify-items: center;
  gap: 6px;
  padding: 36px 20px;
  border-radius: 20px;
  text-align: center;
  font-size: 14px;
  color: var(--ink-2);
  border: 1px dashed var(--hairline);
}
.no-results-title { font-size: 16px; font-weight: 800; color: var(--ink); }
.no-results-hint { font-size: 13.5px; color: var(--ink-2); }
.empty-state-text { padding: 26px 12px; text-align: center; font-size: 14px; color: var(--ink-3); }

.source-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-left: 4px;
  padding: 2px 10px 2px 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  color: var(--ok-ink);
  background: var(--ok-bg);
  white-space: nowrap;
  vertical-align: 1px;
}
.source-badge .i { width: 13px; height: 13px; }

/* skeleton placeholders while a page's data renders */
.skeleton {
  display: block;
  min-height: 74px;
  border-radius: 20px;
  border: 1px solid var(--glass-border);
  background: linear-gradient(100deg, var(--chip-bg) 20%, var(--glass-hi) 50%, var(--chip-bg) 80%) 0 0 / 250% 100%;
  animation: shimmer 1.4s linear infinite;
}
.skeleton.sm { min-height: 64px; }
.skeleton.chart { min-height: 220px; }
@keyframes shimmer { to { background-position: -250% 0; } }

/* ==========================================================================
   Bottom sheet dialog (js/sheet.js) — sheet on phones, centred ≥ 640px
   ========================================================================== */
.sheet {
  width: 100%;
  max-width: 100%;
  max-height: 92dvh;
  margin: auto 0 0;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--ink);
  overflow: visible;
}
.sheet::backdrop {
  background: rgba(11, 10, 26, 0.5);
  animation: fade 0.25s ease both;
}
.sheet-inner {
  display: flex;
  flex-direction: column;
  max-height: 92dvh;
  padding-bottom: env(safe-area-inset-bottom);
  border-radius: 28px 28px 0 0;
  border: 1px solid var(--glass-border);
  border-bottom: 0;
  background: var(--sheet-bg);
  box-shadow: 0 -24px 60px -24px rgba(15, 12, 40, 0.5), inset 0 1px 0 var(--glass-hi);
  -webkit-backdrop-filter: blur(28px) saturate(170%);
  backdrop-filter: blur(28px) saturate(170%);
  animation: sheet-up 0.38s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}
.sheet.closing .sheet-inner { animation: sheet-down 0.2s ease-in both; }
.sheet.closing::backdrop { animation: fade-out 0.2s ease-in both; }
@keyframes sheet-up { from { transform: translateY(100%); } to { transform: none; } }
@keyframes sheet-down { from { transform: none; } to { transform: translateY(100%); } }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
@keyframes fade-out { from { opacity: 1; } to { opacity: 0; } }
.sheet-grab { width: 40px; height: 5px; margin: 10px auto 0; flex: none; border-radius: 3px; background: var(--track); }
.sheet-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; padding: 12px 20px 14px; }
.sheet-title { min-width: 0; }
.sheet-eyebrow { font-size: 11.5px; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent-1); }
.sheet-head h2:focus { outline: none; }
.sheet-head h2 { margin-top: 4px; font-size: 20px; font-weight: 800; line-height: 1.25; letter-spacing: -0.02em; overflow-wrap: anywhere; }
.sheet-body {
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  padding: 16px 20px 22px;
  border-top: 1px solid var(--hairline);
}

/* college detail (js/college-modal.js): KCET + ComedK sections */
.modal-exam-block + .modal-exam-block { margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--hairline); }
.modal-exam-head { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; margin-bottom: 8px; }
.modal-exam-badge { font-size: 12px; font-weight: 800; letter-spacing: 0.04em; padding: 3px 10px; border-radius: 999px; background: var(--chip-bg); border: 1px solid var(--hairline); }
.modal-exam-block.kcet .modal-exam-badge { color: var(--kcet-ink); }
.modal-exam-block.comedk .modal-exam-badge { color: var(--comedk-ink); }
.modal-exam-sub { font-size: 12.5px; color: var(--ink-3); }
.modal-branch-list { display: grid; }
.modal-branch-row { display: flex; align-items: baseline; justify-content: space-between; gap: 14px; padding: 10px 0; border-top: 1px solid var(--hairline); }
.modal-branch-row:first-child { border-top: 0; }
.modal-branch-name { min-width: 0; font-size: 13.5px; font-weight: 600; color: var(--ink-2); line-height: 1.35; overflow-wrap: anywhere; }
.modal-branch-rank { flex: none; font-size: 16px; font-weight: 800; letter-spacing: -0.01em; font-variant-numeric: tabular-nums; }
.modal-exam-block.kcet .modal-branch-rank { color: var(--kcet-ink); }
.modal-exam-block.comedk .modal-branch-rank { color: var(--comedk-ink); }
.modal-no-data { font-size: 13.5px; color: var(--ink-3); font-style: italic; }

/* ==========================================================================
   Footer
   ========================================================================== */
.footer { padding: 30px 4px 0; font-size: 12.5px; color: var(--ink-2); text-align: center; max-width: 52em; margin: 0 auto; }
.footer p + p { margin-top: 6px; }
.footer a { color: var(--ink-2); font-weight: 700; }
.nojs-note { margin: 16px; padding: 12px 14px; border-radius: 14px; background: var(--notice-bg); color: var(--ink); font-size: 14px; }

/* ==========================================================================
   Larger screens
   ========================================================================== */
@media (min-width: 560px) {
  .card { padding: 24px; }
  .stat-value { font-size: 26px; }
}
@media (min-width: 640px) {
  .sheet { width: min(600px, calc(100% - 48px)); margin: auto; }
  .sheet-inner { max-height: 84dvh; border-radius: 28px; border-bottom: 1px solid var(--glass-border); padding-bottom: 0; box-shadow: var(--shadow), inset 0 1px 0 var(--glass-hi); animation-name: pop; }
  .sheet.closing .sheet-inner { animation-name: pop-out; }
  .sheet-grab { display: none; }
  .sheet-head { padding: 22px 24px 14px; }
  .sheet-body { padding: 16px 24px 24px; }
}
@keyframes pop { from { opacity: 0; transform: translateY(12px) scale(0.97); } to { opacity: 1; transform: none; } }
@keyframes pop-out { from { opacity: 1; transform: none; } to { opacity: 0; transform: translateY(8px) scale(0.98); } }

/* Desktop: glass sidebar instead of top bar + tab bar */
@media (min-width: 1000px) {
  :root { --sticky-top: 0px; }
  .topbar, .tabbar, .exam-seg { display: none; }
  .app-shell { display: flex; align-items: flex-start; min-height: 100vh; min-height: 100dvh; }
  .app-content { flex: 1; min-width: 0; }
  .layout { padding-top: 22px; padding-bottom: 56px; }
  .intro { padding: 12px 0 26px; }

  .sidebar {
    -webkit-backdrop-filter: blur(22px) saturate(170%);
    backdrop-filter: blur(22px) saturate(170%);
    position: sticky;
    top: 0;
    z-index: 25;
    display: flex;
    flex-direction: column;
    flex: none;
    width: var(--sidebar-w);
    height: 100vh;
    height: 100dvh;
    border-width: 0 1px 0 0;
    border-radius: 0 26px 26px 0;
    overflow-y: auto;
    overflow-x: hidden;
    transition: width 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
  }
  .sidebar-top { display: flex; align-items: center; gap: 8px; padding: 18px 14px 14px 18px; }
  .sidebar-brand { display: flex; align-items: center; gap: 10px; flex: 1; min-width: 0; min-height: 44px; text-decoration: none; }
  .sidebar-brand-text { font-size: 16px; font-weight: 800; letter-spacing: -0.015em; white-space: nowrap; overflow: hidden; }
  .sidebar-collapse-btn {
    width: 40px;
    height: 40px;
    flex: none;
    display: grid;
    place-items: center;
    padding: 0;
    border-radius: 12px;
    border: 1px solid var(--hairline);
    background: var(--chip-bg);
    color: var(--ink-3);
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s;
  }
  .sidebar-collapse-btn:hover { color: var(--ink); border-color: var(--accent-1); }
  .sidebar-collapse-btn .i { width: 18px; height: 18px; transition: transform 0.25s; }

  .sidebar-nav { flex: 1; display: grid; align-content: start; gap: 2px; padding: 6px 12px; }
  .nav-group-btn, .nav-link-flat {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 44px;
    padding: 0 12px;
    border: 0;
    border-radius: 14px;
    background: none;
    color: var(--ink-2);
    font-size: 14.5px;
    font-weight: 700;
    text-align: left;
    text-decoration: none;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
  }
  .nav-group-btn:hover, .nav-link-flat:hover { background: var(--chip-bg); color: var(--ink); }
  .nav-icon { display: grid; place-items: center; width: 22px; flex: none; }
  .nav-icon .i { width: 20px; height: 20px; }
  .nav-label { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .nav-chevron { flex: none; display: grid; color: var(--ink-3); transition: transform 0.2s; }
  .nav-chevron .i { width: 16px; height: 16px; }
  .nav-group.open .nav-chevron { transform: rotate(90deg); }
  .nav-group-btn.active-group .nav-icon { color: var(--accent-1); }
  .nav-link-flat[aria-current="page"] { background: var(--seg-active); color: var(--ink); box-shadow: 0 2px 10px -4px rgba(15, 12, 40, 0.3); }
  .nav-link-flat[aria-current="page"] .nav-icon { color: var(--accent-1); }
  .nav-subitems { display: none; padding: 2px 0 6px 34px; }
  .nav-group.open .nav-subitems { display: grid; gap: 2px; }
  .nav-subitem {
    display: flex;
    align-items: center;
    min-height: 40px;
    padding: 0 12px;
    border-radius: 12px;
    color: var(--ink-3);
    font-size: 13.5px;
    font-weight: 700;
    text-decoration: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: background 0.2s, color 0.2s;
  }
  .nav-subitem:hover { background: var(--chip-bg); color: var(--ink); }
  .nav-subitem[aria-current="page"] { background: var(--seg-active); color: var(--ink); box-shadow: 0 2px 10px -4px rgba(15, 12, 40, 0.3); }

  .sidebar-bottom { display: grid; gap: 10px; padding: 12px 12px 18px; border-top: 1px solid var(--hairline); }
  .side-theme {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    min-height: 44px;
    padding: 0 12px;
    border-radius: 14px;
    border: 1px solid var(--hairline);
    background: var(--chip-bg);
    color: var(--ink-2);
    font-size: 14px;
    font-weight: 700;
    text-align: left;
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s;
  }
  .side-theme:hover { color: var(--ink); border-color: var(--accent-1); }
  .side-theme .i { width: 20px; height: 20px; }
  .sidebar-credit { font-size: 11.5px; color: var(--ink-3); text-align: center; }

  /* collapsed icon rail */
  .sidebar.collapsed { width: var(--sidebar-w-collapsed); }
  .sidebar.collapsed .sidebar-top { flex-direction: column; padding: 18px 10px 10px; }
  .sidebar.collapsed .sidebar-brand { flex: none; }
  .sidebar.collapsed .sidebar-collapse-btn .i { transform: rotate(180deg); }
  .sidebar.collapsed .sidebar-brand-text,
  .sidebar.collapsed .nav-label,
  .sidebar.collapsed .nav-chevron,
  .sidebar.collapsed .nav-subitems,
  .sidebar.collapsed .side-theme .nav-label,
  .sidebar.collapsed .sidebar-credit { display: none; }
  .sidebar.collapsed .sidebar-nav { padding: 6px 10px; }
  .sidebar.collapsed .nav-group-btn,
  .sidebar.collapsed .nav-link-flat,
  .sidebar.collapsed .side-theme { justify-content: center; padding: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
  .blob, .pulse, .skeleton { animation: none; }
}
@media (forced-colors: active) {
  .glass, .rcard, .stat-tile, .chip, .round-tab, .exam-tab { border: 1px solid CanvasText; }
}