/* ============================================================
   CGPA to Percentage Calculator — Premium Light UI
   Accent: teal-green (hue 175). Shared by pSEO subpages
   (VTU, Mumbai, Anna, DU, SGPA, 10-point, etc.) — class names
   are PRESERVED, only restyled. The CSS var aliases below keep
   the subpages' inline var(--heading/--primary/--border/--accent)
   references resolving to the light palette.
   ============================================================ */

:root {
  --ink: oklch(24% .02 175);
  --muted: oklch(52% .03 175);
  --paper: oklch(97% .01 175);
  --surface: oklch(100% .002 175);
  --line: oklch(90% .02 175);
  --accent: oklch(56% .13 175);
  --accent-dark: oklch(44% .1 175);
  --accent-soft: oklch(94% .04 175);
  --danger: oklch(58% .16 25);
  --radius: 16px;
  --shadow: 0 18px 44px oklch(24% .04 175 / .10);

  /* Compatibility aliases consumed by pSEO subpage inline styles */
  --bg: var(--paper);
  --surface-2: var(--surface);
  --text: var(--ink);
  --border: var(--line);
  --heading: var(--ink);
  --primary: var(--accent-dark);

  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  font-synthesis: none;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--paper);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
a { color: inherit; }
code { font-family: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace; }

/* Header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(16px, 5vw, 48px);
  background: color-mix(in oklch, var(--surface) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 100;
}
.logo { font-size: 1.2rem; font-weight: 800; letter-spacing: -.03em; color: var(--ink); text-decoration: none; }
.logo span { color: var(--accent); }
.header-badges { display: flex; gap: 8px; }
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: .74rem; font-weight: 700; padding: 6px 13px; border-radius: 999px;
}
.official-badge {
  color: var(--accent-dark);
  background: var(--accent-soft);
  border: 1px solid color-mix(in oklch, var(--accent) 30%, var(--line));
}
/* Layout container */
.app-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 clamp(16px, 5vw, 40px) 80px;
}

/* Hero */
.hero { padding: 64px 0 40px; max-width: 720px; }
.eyebrow, .section-kicker {
  display: block;
  text-transform: uppercase;
  letter-spacing: .11em;
  font-size: 11px;
  font-weight: 800;
  color: var(--accent-dark);
}
.page-title {
  font-size: clamp(38px, 6vw, 68px);
  line-height: 1.02;
  letter-spacing: -.055em;
  margin: 14px 0 18px;
  text-wrap: balance;
}
.page-sub {
  max-width: 620px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.6;
}
.hero-note {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-top: 22px;
  color: var(--muted);
  font-size: 13px;
}
.status-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 5px var(--accent-soft);
}

/* Calculator card */
.calc-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(20px, 4vw, 32px);
  box-shadow: var(--shadow);
}

/* Inputs */
.input-group { position: relative; }
.input-group label {
  display: block;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--muted);
  font-weight: 800;
  margin-bottom: 8px;
}
.input-group input[type="text"],
.input-group input[type="number"],
.input-group select {
  width: 100%;
  min-height: 48px;
  padding: 0 14px;
  font-size: 16px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--paper);
  color: var(--ink);
  transition: border-color .18s, box-shadow .18s;
}
.input-group select { cursor: pointer; -webkit-appearance: none; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23576' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 14px center; padding-right: 40px;
}
.input-group input:focus,
.input-group select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}
.input-group input:disabled,
.input-group select:disabled {
  background: color-mix(in oklch, var(--paper) 60%, var(--line));
  color: var(--muted);
  cursor: not-allowed;
  opacity: .8;
}

/* Search wrapper + icon */
.search-wrapper { position: relative; }
.search-icon {
  position: absolute;
  left: 14px; top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
}
.search-wrapper input { padding-left: 44px !important; }

/* Autocomplete list */
.autocomplete-list {
  list-style: none;
  margin-top: 6px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 16px 34px oklch(24% .04 175 / .14);
  overflow: hidden;
  position: absolute;
  left: 0; right: 0;
  z-index: 40;
  max-height: 320px;
  overflow-y: auto;
}
.autocomplete-list li {
  padding: 12px 16px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 1px solid var(--line);
  transition: background .12s, color .12s;
}
.autocomplete-list li:last-child { border-bottom: 0; }
.autocomplete-list li:hover {
  background: var(--accent-soft);
  color: var(--accent-dark);
}
.autocomplete-list li.is-active {
  background: var(--accent-soft);
  color: var(--accent-dark);
}
.autocomplete-list li.no-match {
  color: var(--danger);
  cursor: default;
  pointer-events: none;
}

/* Inline validation message */
.input-error {
  margin-top: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--danger);
}
.input-error[hidden] { display: none; }

/* Selected university chip */
.selected-uni {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 48px;
  padding: 0 14px;
  border: 1px solid color-mix(in oklch, var(--accent) 30%, var(--line));
  border-radius: 11px;
  background: var(--accent-soft);
  font-weight: 700;
  color: var(--accent-dark);
}
.text-btn {
  border: 0;
  background: none;
  color: var(--accent-dark);
  font-weight: 700;
  font-size: 13px;
  text-decoration: underline;
  text-underline-offset: 3px;
  min-height: 44px;
  padding: 0 4px;
}
.text-btn:hover { color: var(--ink); }

/* Grid + spacing helpers (shared vocabulary) */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 20px; }
.w-100 { width: 100%; }
.text-center { text-align: center; }
.text-sm { font-size: 14px; }
.text-xs { font-size: 12px; }
.muted { color: var(--muted); }
/* Result box */
.result-box {
  display: grid;
  grid-template-columns: 1fr minmax(0, 300px);
  gap: 24px;
  align-items: center;
  margin-top: 24px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(180deg, var(--accent-soft), color-mix(in oklch, var(--accent-soft) 40%, var(--surface)));
}
.result-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .08em;
  font-weight: 800;
  color: var(--accent-dark);
}
.result-value {
  font-size: clamp(44px, 8vw, 64px);
  line-height: 1;
  letter-spacing: -.05em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  margin: 6px 0 4px;
}

/* Formula proof panel */
.formula-proof { margin-top: 14px; }
.proof-title {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  font-weight: 800;
  color: var(--accent-dark);
  margin-bottom: 8px;
}
.formula-proof code {
  display: inline-block;
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--ink);
  font-size: 13px;
  padding: 6px 10px;
  border-radius: 8px;
}
.proof-note { margin-top: 8px; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--surface);
  color: var(--ink);
  font-weight: 700;
  font-size: 15px;
  transition: transform .18s cubic-bezier(.16, 1, .3, 1), background .18s, border-color .18s, box-shadow .18s;
}
.btn:hover { transform: translateY(-2px); border-color: var(--accent); }
.primary-btn {
  background: var(--accent);
  border-color: var(--accent);
  color: oklch(99% .01 175);
  box-shadow: 0 10px 24px color-mix(in oklch, var(--accent) 35%, transparent);
}
.primary-btn:hover { background: var(--accent-dark); border-color: var(--accent-dark); }
.btn:disabled {
  opacity: .5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
  background: color-mix(in oklch, var(--paper) 55%, var(--line));
  border-color: var(--line);
  color: var(--muted);
}
/* Copy success state */
.btn.is-copied {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-dark);
}
.btn.is-copied:hover { transform: none; }

/* SEO content sections */
.seo-content { max-width: 760px; margin: 64px auto 0; }
.seo-content h2 {
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1.08;
  letter-spacing: -.045em;
  margin: 10px 0 16px;
  text-wrap: balance;
}
.seo-content h3 {
  font-size: 21px;
  letter-spacing: -.02em;
  margin: 30px 0 10px;
}
.seo-content h4 { font-size: 16px; letter-spacing: -.01em; margin-bottom: 8px; }
.seo-content p { color: var(--muted); line-height: 1.75; margin-bottom: 14px; }
.seo-content ul { margin: 4px 0 14px; padding-left: 22px; color: var(--muted); line-height: 1.7; }
.seo-content li { margin-bottom: 10px; }
.seo-content strong { color: var(--ink); font-weight: 700; }
.seo-content em { color: var(--accent-dark); font-style: normal; font-weight: 600; }
.seo-content code {
  background: var(--accent-soft);
  color: var(--accent-dark);
  padding: 2px 7px;
  border-radius: 6px;
  font-size: .9em;
}

/* Formula callout */
.formula-callout { margin: 6px 0 18px; }
.formula-callout code {
  display: inline-block;
  font-size: 18px;
  padding: 12px 20px;
  border-radius: 10px;
  background: var(--ink);
  color: oklch(97% .01 175);
  border: 0;
}

/* Disclaimer box */
.disclaimer-box {
  border: 1px solid color-mix(in oklch, var(--danger) 25%, var(--line));
  background: color-mix(in oklch, var(--danger) 6%, var(--surface));
  border-radius: 12px;
  padding: 20px 22px;
}
.disclaimer-box h4 { color: var(--ink); }
.disclaimer-box p { margin-bottom: 0; }
/* Tables */
.table-wrap { overflow-x: auto; margin: 18px 0 4px; border: 1px solid var(--line); border-radius: 12px; }
.cgpa-table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  background: var(--surface);
}
.cgpa-table th, .cgpa-table td {
  text-align: left;
  padding: 13px 16px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.cgpa-table thead th {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--muted);
  background: var(--paper);
}
.cgpa-table tbody tr:last-child td { border-bottom: 0; }
.cgpa-table tbody tr:hover td { background: var(--accent-soft); }
.cgpa-table td:first-child { font-weight: 700; color: var(--ink); }
.cgpa-table td:nth-child(2) { color: var(--accent-dark); font-weight: 600; }

/* Shared containers used by pSEO subpages */
.dt-container { max-width: 760px; margin-left: auto; margin-right: auto; }
.dt-mb-16 { margin-bottom: 16px; }

/* FAQ */
.faq-section { margin-top: 64px; }
.faq-heading {
  font-size: clamp(26px, 3.6vw, 38px);
  letter-spacing: -.045em;
  margin-bottom: 8px;
  text-wrap: balance;
}
.faq-list { margin-top: 8px; }
.faq-item {
  border-top: 1px solid var(--line);
  padding: 18px 0;
}
.faq-item:last-child { border-bottom: 1px solid var(--line); }
.faq-item summary {
  cursor: pointer;
  font-weight: 800;
  letter-spacing: -.01em;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  color: var(--accent-dark);
  font-size: 22px;
  font-weight: 400;
  line-height: 1;
  transition: transform .2s;
}
.faq-item[open] summary::after { content: '\2212'; }
.faq-item p { color: var(--muted); line-height: 1.7; font-size: 15px; margin: 12px 0 0; }

/* Related tools */
.related-section { margin-top: 64px; }
.related-heading {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: .09em;
  color: var(--muted);
  margin-bottom: 16px;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}
.related-card {
  display: flex;
  align-items: center;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  text-decoration: none;
  font-weight: 700;
  font-size: 14px;
  color: var(--ink);
  transition: transform .18s cubic-bezier(.16, 1, .3, 1), border-color .18s, color .18s;
}
.related-card:hover { transform: translateY(-2px); border-color: var(--accent); color: var(--accent-dark); }

/* Footer */
.site-footer {
  margin-top: 72px;
  padding: 28px clamp(16px, 5vw, 48px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}
.footer-links { display: flex; gap: 18px; justify-content: center; margin-top: 8px; }
.site-footer a { color: var(--accent-dark); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }

/* Focus */
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

/* Responsive — single column below 900px */
@media (max-width: 900px) {
  .result-box { grid-template-columns: 1fr; gap: 18px; }
}
@media (max-width: 640px) {
  .site-header { padding: 14px 16px; }
  .hero { padding: 44px 0 28px; }
  .grid-2 { grid-template-columns: 1fr; }
  .calc-card { padding: 18px; }
  /* Keep inputs at 16px to prevent iOS zoom */
  .input-group input,
  .input-group select { font-size: 16px; }
  .related-grid { grid-template-columns: 1fr; }
}

/* Reduced motion — MUST be last */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}