/* ==========================================================================
   MeritSlip — NUST Aggregate Calculator
   Design tokens: Ink Navy / Paper / Merit Gold — "official mark-sheet" motif
   ========================================================================== */

:root{
  --ink-900:#0B1D33;
  --ink-800:#0F2540;
  --ink-700:#1B3A5C;
  --ink-500:#3E5C7E;
  --paper:#F6F6F2;
  --paper-raised:#FFFFFF;
  --line:#DADFDA;
  --gold:#E1972E;
  --gold-dark:#B9740F;
  --good:#2E8B57;
  --good-bg:#E8F5EC;
  --bad:#C4432E;
  --bad-bg:#FBEAE6;

  --font-display: Georgia, "Iowan Old Style", "Sitka Text", "Noto Serif", "Times New Roman", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", "Segoe UI Mono", Consolas, monospace;

  --radius: 10px;
  --shadow-card: 0 1px 2px rgba(11,29,51,.06), 0 8px 24px -12px rgba(11,29,51,.18);
  --max: 1120px;
}

*, *::before, *::after{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *, *::before, *::after{ animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; }
}

body{
  margin:0;
  background:
    linear-gradient(var(--paper), var(--paper)),
    repeating-linear-gradient(0deg, rgba(15,37,64,.045) 0 1px, transparent 1px 28px),
    repeating-linear-gradient(90deg, rgba(15,37,64,.045) 0 1px, transparent 1px 28px);
  color: var(--ink-800);
  font-family: var(--font-body);
  font-size:17px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}

img{ max-width:100%; display:block; }
a{ color: var(--ink-700); }
a:focus-visible, button:focus-visible, input:focus-visible, [tabindex]:focus-visible{
  outline: 3px solid var(--gold);
  outline-offset: 2px;
}

.wrap{ max-width:var(--max); margin:0 auto; padding:0 24px; }

.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;
}

.skip-link{
  position:absolute; left:-999px; top:auto;
  background:var(--ink-900); color:#fff; padding:12px 18px; z-index:200; border-radius:0 0 8px 0;
}
.skip-link:focus{ left:0; top:0; }

h1,h2,h3{ font-family:var(--font-display); color:var(--ink-900); font-weight:700; letter-spacing:-0.01em; margin:0 0 .5em; }
h1{ font-size:clamp(2.1rem, 4vw, 3.1rem); line-height:1.08; }
h2{ font-size:clamp(1.6rem, 2.6vw, 2.2rem); line-height:1.15; }
h3{ font-size:1.15rem; }
p{ margin:0 0 1em; }

.eyebrow{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--gold-dark);
  font-weight:600;
  margin:0 0 .9em;
}

/* ---------- Header ---------- */
.site-header{
  position:sticky; top:0; z-index:100;
  background:rgba(246,246,242,.88);
  backdrop-filter: saturate(160%) blur(8px);
  border-bottom:1px solid var(--line);
}
.header-inner{ display:flex; align-items:center; justify-content:space-between; height:64px; }
.brand{
  display:flex; align-items:center; gap:8px;
  font-family:var(--font-display); font-weight:700; font-size:1.15rem;
  color:var(--ink-900); text-decoration:none;
}
.brand-mark{ color:var(--gold-dark); }
.main-nav{ display:flex; gap:28px; }
.main-nav a{ font-size:.94rem; text-decoration:none; color:var(--ink-700); font-weight:500; }
.main-nav a:hover{ color:var(--gold-dark); }
@media (max-width:760px){ .main-nav{ display:none; } }

/* ---------- Hero ---------- */
.hero{ padding:56px 0 24px; }
.breadcrumb ol{ list-style:none; display:flex; gap:6px; margin:0 0 20px; padding:0; font-size:.82rem; color:var(--ink-500); font-family:var(--font-mono); }
.breadcrumb li + li::before{ content:"/"; margin-right:6px; color:var(--line); }
.breadcrumb a{ text-decoration:none; color:var(--ink-500); }
.breadcrumb a:hover{ color:var(--gold-dark); }
.breadcrumb [aria-current]{ color:var(--ink-800); }

.hero-sub{ max-width:62ch; font-size:1.14rem; color:var(--ink-700); }
.tldr{
  max-width:66ch;
  background:var(--paper-raised);
  border:1px solid var(--line);
  border-left:4px solid var(--gold);
  border-radius:6px;
  padding:14px 18px;
  font-size:.96rem;
  color:var(--ink-800);
}

/* ---------- Calculator card ---------- */
.calc-section{ padding:12px 0 48px; }
.calc-card{
  background:var(--paper-raised);
  border:1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  overflow:hidden;
}
.calc-tabs{ display:flex; background:var(--ink-900); }
.tab{
  flex:1; padding:16px 20px; border:0; background:transparent; color:rgba(255,255,255,.55);
  font-family:var(--font-body); font-weight:600; font-size:.98rem; cursor:pointer;
  border-bottom:3px solid transparent;
}
.tab.active{ color:#fff; border-bottom-color:var(--gold); background:rgba(255,255,255,.04); }
.tab:hover:not(.active){ color:rgba(255,255,255,.85); }

.calc-body{ padding:28px 28px 8px; }
.calc-panel[hidden]{ display:none; }

.field-grid{ display:grid; grid-template-columns:repeat(3, 1fr); gap:20px; }
@media (max-width:860px){ .field-grid{ grid-template-columns:1fr; } }

.field-group{ border:1px dashed var(--line); border-radius:8px; padding:16px; margin:0; }
.field-group legend{ font-family:var(--font-mono); font-size:.74rem; text-transform:uppercase; letter-spacing:.06em; color:var(--ink-500); padding:0 6px; font-weight:600; }
.field-row{ margin-top:10px; }
.field-row label{ display:block; font-size:.86rem; font-weight:600; color:var(--ink-800); margin-bottom:6px; }
.field-row input{
  width:100%; padding:11px 12px; border:1px solid var(--line); border-radius:6px;
  font-family:var(--font-mono); font-size:1rem; font-variant-numeric:tabular-nums;
  background:var(--paper); color:var(--ink-900);
}
.field-row input:focus{ border-color:var(--ink-700); background:#fff; }
.hint{ margin:10px 0 0; font-size:.82rem; color:var(--ink-500); }

.calc-actions{ display:flex; gap:12px; padding:22px 0 20px; }
.btn-primary, .btn-ghost{
  font-family:var(--font-body); font-weight:600; font-size:.98rem; border-radius:7px; padding:13px 26px;
  cursor:pointer; border:1px solid transparent;
}
.btn-primary{ background:var(--ink-900); color:#fff; }
.btn-primary:hover{ background:var(--ink-700); }
.btn-ghost{ background:transparent; color:var(--ink-700); border-color:var(--line); }
.btn-ghost:hover{ border-color:var(--ink-500); }

/* ---------- Result "merit slip" — signature element ---------- */
.result-slip{
  margin:0 28px 28px; position:relative;
  background:var(--ink-900);
  color:#fff;
  border-radius:8px;
  padding:26px 30px 22px;
  border-top:3px dashed rgba(255,255,255,.25);
}
.slip-notch{
  position:absolute; top:-11px; width:22px; height:22px; border-radius:50%;
  background:var(--paper);
  box-shadow:0 0 0 1px var(--line);
}
.slip-notch-left{ left:-11px; }
.slip-notch-right{ right:-11px; }

.slip-head{ display:flex; align-items:center; justify-content:space-between; margin-bottom:6px; }
.slip-label{ font-family:var(--font-mono); font-size:.78rem; text-transform:uppercase; letter-spacing:.1em; color:rgba(255,255,255,.6); }
.slip-status{
  font-family:var(--font-mono); font-size:.76rem; font-weight:700; letter-spacing:.06em; text-transform:uppercase;
  padding:4px 10px; border-radius:20px;
}
.slip-status.eligible{ background:var(--good-bg); color:var(--good); }
.slip-status.ineligible{ background:var(--bad-bg); color:var(--bad); }

.slip-number{ font-family:var(--font-mono); font-variant-numeric:tabular-nums; font-weight:700; font-size:clamp(2.4rem,6vw,3.6rem); line-height:1; margin:6px 0 20px; }
.slip-percent{ font-size:.5em; color:rgba(255,255,255,.6); margin-left:4px; }

.slip-table{ width:100%; border-collapse:collapse; font-size:.9rem; margin-bottom:8px; }
.slip-table th, .slip-table td{ text-align:left; padding:8px 4px; border-bottom:1px solid rgba(255,255,255,.12); font-family:var(--font-mono); font-variant-numeric:tabular-nums; }
.slip-table thead th{ color:rgba(255,255,255,.55); font-weight:600; text-transform:uppercase; font-size:.7rem; letter-spacing:.06em; border-bottom:1px solid rgba(255,255,255,.25); }
.slip-note{ font-size:.82rem; color:rgba(255,255,255,.65); margin:10px 0 0; }

.disclaimer{ font-size:.82rem; color:var(--ink-500); max-width:78ch; margin-top:18px; }

/* ---------- Generic sections ---------- */
.section{ padding:56px 0; border-top:1px solid var(--line); }
.section.alt{ background:rgba(15,37,64,.028); }
.section > .wrap > p:not(.eyebrow):not(.table-note):not(.callout){ max-width:70ch; }

.formula-block{
  background:var(--paper-raised); border:1px solid var(--line); border-radius:8px;
  padding:16px 20px; margin:0 0 14px; max-width:78ch;
}
.formula-eyebrow{ font-family:var(--font-mono); font-size:.72rem; text-transform:uppercase; letter-spacing:.08em; color:var(--gold-dark); margin:0 0 6px; font-weight:700; }
.formula-text{ font-family:var(--font-mono); font-size:1.02rem; color:var(--ink-900); margin:0; }

.table-wrap{ overflow-x:auto; margin:20px 0; }
.data-table{ border-collapse:collapse; width:100%; min-width:480px; background:var(--paper-raised); }
.data-table caption{ text-align:left; font-size:.8rem; color:var(--ink-500); margin-bottom:8px; font-family:var(--font-mono); }
.data-table th, .data-table td{ border:1px solid var(--line); padding:11px 14px; text-align:left; font-size:.94rem; }
.data-table thead th{ background:var(--ink-900); color:#fff; font-weight:600; }
.data-table tbody th{ font-weight:600; background:rgba(15,37,64,.03); }
.data-table td{ font-family:var(--font-mono); font-variant-numeric:tabular-nums; }
.table-note{ font-size:.86rem; color:var(--ink-500); max-width:78ch; }

.example-grid{ display:grid; grid-template-columns:1fr 1fr; gap:24px; margin-top:24px; }
@media (max-width:760px){ .example-grid{ grid-template-columns:1fr; } }
.example-card{ background:var(--paper-raised); border:1px solid var(--line); border-radius:8px; padding:22px; }
.example-list{ margin:0 0 14px; padding-left:1.1em; font-size:.94rem; }
.example-list li{ margin-bottom:6px; }
.example-total{ font-family:var(--font-mono); font-weight:700; font-size:1.05rem; color:var(--ink-900); margin:0; padding-top:10px; border-top:1px dashed var(--line); }
.callout{
  margin-top:24px; max-width:78ch; background:rgba(225,151,46,.1); border-left:4px solid var(--gold);
  padding:14px 18px; border-radius:6px; font-size:.95rem;
}

.steps{ list-style:none; margin:0; padding:0; counter-reset:step; max-width:78ch; }
.steps li{ counter-increment:step; position:relative; padding-left:52px; margin-bottom:26px; }
.steps li::before{
  content: counter(step);
  position:absolute; left:0; top:-2px;
  width:36px; height:36px; border-radius:50%;
  background:var(--ink-900); color:#fff;
  font-family:var(--font-mono); font-weight:700; font-size:.95rem;
  display:flex; align-items:center; justify-content:center;
}
.steps h3{ margin-bottom:.25em; }
.steps p{ color:var(--ink-700); margin:0; }

/* ---------- FAQ / accordion ---------- */
.accordion{ max-width:82ch; }
.accordion-item{ border-bottom:1px solid var(--line); }
.accordion-trigger{
  width:100%; text-align:left; background:none; border:0; padding:18px 4px;
  font-family:var(--font-display); font-size:1.05rem; font-weight:700; color:var(--ink-900);
  display:flex; justify-content:space-between; align-items:center; gap:16px; cursor:pointer;
}
.accordion-trigger::after{
  content:"+"; font-family:var(--font-mono); font-weight:400; font-size:1.3rem; color:var(--gold-dark); flex-shrink:0;
}
.accordion-trigger[aria-expanded="true"]::after{ content:"–"; }
.accordion-panel{ padding:0 4px 18px; color:var(--ink-700); }
.accordion-panel p{ margin:0; max-width:74ch; }

/* ---------- Nav dropdown ---------- */
.has-dropdown{ position:relative; }
.dropdown-panel{
  display:none; position:absolute; top:100%; left:50%; transform:translateX(-50%);
  background:var(--paper-raised); border:1px solid var(--line); border-radius:8px;
  box-shadow:var(--shadow-card); padding:18px; margin-top:10px; z-index:150;
  grid-template-columns:repeat(4, 180px); gap:18px;
}
.has-dropdown:hover .dropdown-panel,
.has-dropdown:focus-within .dropdown-panel{ display:grid; }
.dropdown-group h4{ font-family:var(--font-mono); font-size:.68rem; text-transform:uppercase; letter-spacing:.08em; color:var(--gold-dark); margin:0 0 8px; }
.dropdown-group ul{ list-style:none; margin:0; padding:0; }
.dropdown-group li{ margin-bottom:6px; }
.dropdown-group a{ font-size:.86rem; text-decoration:none; color:var(--ink-700); }
.dropdown-group a:hover{ color:var(--gold-dark); }

/* ---------- Subpage hero (no calculator) ---------- */
.page-hero{ padding:44px 0 8px; }
.page-hero .hero-sub{ font-size:1.05rem; }

/* ---------- Related guides ---------- */
.related-grid{ display:grid; grid-template-columns:repeat(3, 1fr); gap:16px; margin-top:20px; }
@media (max-width:820px){ .related-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width:560px){ .related-grid{ grid-template-columns:1fr; } }
.related-card{
  display:block; background:var(--paper-raised); border:1px solid var(--line); border-radius:8px;
  padding:16px 18px; text-decoration:none; color:var(--ink-800);
}
.related-card:hover{ border-color:var(--gold); }
.related-card .rc-cat{ font-family:var(--font-mono); font-size:.68rem; text-transform:uppercase; letter-spacing:.07em; color:var(--gold-dark); display:block; margin-bottom:6px; }
.related-card .rc-title{ font-weight:700; font-size:.98rem; color:var(--ink-900); }

.mini-cta{
  display:inline-block; margin-top:10px; background:var(--ink-900); color:#fff; text-decoration:none;
  padding:12px 22px; border-radius:7px; font-weight:600; font-size:.92rem;
}
.mini-cta:hover{ background:var(--ink-700); }

.entity-list{ display:flex; flex-wrap:wrap; gap:8px; margin:16px 0; padding:0; list-style:none; }
.entity-list li{
  font-family:var(--font-mono); font-size:.78rem; background:rgba(15,37,64,.05);
  border:1px solid var(--line); padding:6px 12px; border-radius:20px; color:var(--ink-700);
}

/* ---------- Footer sitemap ---------- */
.footer-sitemap{ border-top:1px solid rgba(255,255,255,.12); margin-top:28px; padding-top:28px; display:grid; grid-template-columns:repeat(5, 1fr); gap:20px; }
@media (max-width:900px){ .footer-sitemap{ grid-template-columns:repeat(2, 1fr); } }
.footer-sitemap h4{ font-family:var(--font-mono); font-size:.68rem; text-transform:uppercase; letter-spacing:.08em; color:rgba(255,255,255,.45); margin:0 0 10px; }
.footer-sitemap ul{ list-style:none; margin:0; padding:0; }
.footer-sitemap li{ margin-bottom:7px; }
.footer-sitemap a{ font-size:.84rem; color:rgba(255,255,255,.72); text-decoration:none; }
.footer-sitemap a:hover{ color:var(--gold); }

/* ---------- Footer ---------- */
.site-footer{ border-top:1px solid var(--line); padding:36px 0; background:var(--ink-900); color:rgba(255,255,255,.7); }
.footer-inner{ display:flex; justify-content:space-between; gap:24px; flex-wrap:wrap; }
.brand-foot{ font-family:var(--font-display); font-weight:700; color:#fff; font-size:1.1rem; margin:0 0 6px; }
.foot-note{ font-size:.84rem; max-width:52ch; margin:0; }
.foot-nav{ display:flex; gap:20px; align-self:center; }
.foot-nav a{ color:rgba(255,255,255,.75); text-decoration:none; font-size:.9rem; }
.foot-nav a:hover{ color:var(--gold); }