/* =========================================================================
   Shuren International School — shared styles
   Original design system. Warm academic palette + editorial typography.
   ========================================================================= */

:root {
  /* Palette — warm academic */
  --ink: oklch(0.18 0.02 250);
  --ink-2: oklch(0.32 0.02 250);
  --ink-3: oklch(0.50 0.015 250);
  --paper: oklch(0.985 0.005 85);
  --paper-2: oklch(0.96 0.012 80);
  --paper-3: oklch(0.92 0.015 80);
  --line: oklch(0.86 0.013 80);
  --line-2: oklch(0.78 0.015 80);

  --brand: oklch(0.32 0.07 245);          /* deep ink-navy */
  --brand-2: oklch(0.46 0.10 245);
  --accent: oklch(0.58 0.13 38);          /* terracotta */
  --accent-2: oklch(0.66 0.12 38);
  --gold: oklch(0.72 0.10 80);
  --ok: oklch(0.55 0.12 150);
  --warn: oklch(0.62 0.15 50);

  /* Type */
  --font-display: "Newsreader", "Spectral", Georgia, serif;
  --font-body: "DM Sans", "Helvetica Neue", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  /* Layout */
  --max: 1240px;
  --pad: clamp(20px, 3vw, 40px);
  --radius: 4px;
  --radius-lg: 8px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.1;
  margin: 0 0 0.4em;
  text-wrap: balance;
}
h1 { font-size: clamp(36px, 5vw, 64px); letter-spacing: -0.025em; }
h2 { font-size: clamp(28px, 3.4vw, 44px); letter-spacing: -0.02em; }
h3 { font-size: clamp(20px, 2vw, 26px); }
h4 { font-size: 18px; font-weight: 600; font-family: var(--font-body); letter-spacing: 0; }
p { margin: 0 0 1em; text-wrap: pretty; }
a { color: var(--brand); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color .15s, color .15s; }
a:hover { border-bottom-color: currentColor; }
hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }

img { max-width: 100%; display: block; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--pad); }
.wrap-narrow { max-width: 820px; margin: 0 auto; padding: 0 var(--pad); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 500;
}

.muted { color: var(--ink-3); }
.small { font-size: 14px; }

/* ============================== HEADER ================================== */
.site-header {
  position: sticky;
  top: 0;
  background: color-mix(in oklab, var(--paper) 92%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
  z-index: 100;
}
.site-header-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 14px var(--pad);
  max-width: var(--max);
  margin: 0 auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  border: none;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.01em;
}
.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  background: var(--brand);
  color: var(--paper);
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: 18px;
  border-radius: 50%;
}
.brand-name small {
  display: block;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-top: 2px;
}
nav.primary {
  display: flex;
  gap: 28px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}
nav.primary a {
  color: var(--ink-2);
  font-size: 14px;
  font-weight: 500;
  border: none;
  position: relative;
  padding: 4px 0;
}
nav.primary a:hover, nav.primary a.active {
  color: var(--brand);
}
nav.primary a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--accent);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Hamburger (mobile) */
.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px 10px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-2);
}

@media (max-width: 880px) {
  .site-header-inner { grid-template-columns: auto auto; }
  nav.primary {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 8px var(--pad) 20px;
    gap: 0;
  }
  nav.primary.open { display: flex; }
  nav.primary a { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .menu-toggle { display: inline-flex; }
}

/* ============================== BUTTONS ================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background .15s, color .15s, border-color .15s, transform .1s;
  letter-spacing: 0.01em;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); border-bottom-color: transparent; }
.btn:active { transform: translateY(0); }

.btn-primary { background: var(--brand); color: var(--paper); }
.btn-primary:hover { background: var(--brand-2); color: var(--paper); }
.btn-accent { background: var(--accent); color: var(--paper); }
.btn-accent:hover { background: var(--accent-2); color: var(--paper); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line-2); }
.btn-ghost:hover { background: var(--paper-2); color: var(--ink); }
.btn-link { background: none; padding: 0; color: var(--brand); border: none; }
.btn-link:hover { color: var(--accent); }
.btn-sm { padding: 8px 14px; font-size: 13px; }
.btn-lg { padding: 16px 28px; font-size: 15px; }

.cart-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  font-family: var(--font-body);
}
.cart-btn:hover { background: var(--paper-2); color: var(--brand); border-color: var(--ink-3); }
.cart-count {
  background: var(--accent);
  color: var(--paper);
  font-size: 11px;
  font-weight: 600;
  padding: 1px 7px;
  border-radius: 999px;
  min-width: 18px;
  text-align: center;
}
.cart-count[data-count="0"] { display: none; }

/* ============================== HERO / SECTIONS ========================== */
.hero {
  padding: clamp(48px, 8vw, 96px) 0 clamp(48px, 7vw, 88px);
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(28px, 5vw, 80px);
  align-items: center;
}
@media (max-width: 880px) { .hero-grid { grid-template-columns: 1fr; } }

.section {
  padding: clamp(56px, 8vw, 96px) 0;
}
.section-tight { padding: clamp(36px, 5vw, 60px) 0; }
.section-alt { background: var(--paper-2); }
.section-dark { background: var(--ink); color: var(--paper); }
.section-dark h1, .section-dark h2, .section-dark h3 { color: var(--paper); }
.section-dark a { color: var(--gold); }

.section-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: end;
  margin-bottom: clamp(32px, 5vw, 56px);
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}
@media (max-width: 880px) {
  .section-header { grid-template-columns: 1fr; gap: 16px; }
}

/* ============================== IMAGE PLACEHOLDERS ====================== */
.ph {
  background:
    repeating-linear-gradient(
      45deg,
      transparent 0 18px,
      color-mix(in oklab, var(--ink) 5%, transparent) 18px 19px
    ),
    var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 24px;
  min-height: 200px;
  aspect-ratio: 4/3;
}
.ph small {
  display: block;
  font-family: var(--font-body);
  font-size: 10px;
  letter-spacing: 0;
  text-transform: none;
  margin-top: 4px;
  color: var(--ink-3);
  opacity: 0.7;
}
.ph-portrait { aspect-ratio: 3/4; }
.ph-wide { aspect-ratio: 21/9; }
.ph-square { aspect-ratio: 1/1; }
.ph-tall { aspect-ratio: 2/3; }
.ph-hero { min-height: 480px; aspect-ratio: auto; }

/* ============================== CARDS ==================================== */
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}
.card-soft {
  background: var(--paper-2);
  border-radius: var(--radius-lg);
  padding: 28px;
}

/* ============================== FORMS ==================================== */
.field { display: grid; gap: 6px; margin-bottom: 16px; }
.field label {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.field input,
.field select,
.field textarea {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--ink);
  padding: 12px 14px;
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  background: var(--paper);
  width: 100%;
  transition: border-color .15s, box-shadow .15s;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--brand) 18%, transparent);
}
.field.error input,
.field.error select,
.field.error textarea {
  border-color: var(--accent);
  background: color-mix(in oklab, var(--accent) 4%, var(--paper));
}
.field-error {
  color: var(--accent);
  font-size: 12px;
  margin-top: 4px;
  display: none;
}
.field.error .field-error { display: block; }
.field textarea { min-height: 120px; resize: vertical; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 600px) { .field-row { grid-template-columns: 1fr; } }

.checkbox {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--ink-2);
}
.checkbox input { margin-top: 3px; }

/* ============================== FOOTER =================================== */
.site-footer {
  background: var(--ink);
  color: color-mix(in oklab, var(--paper) 70%, var(--ink));
  padding: 64px 0 32px;
  font-size: 14px;
}
.site-footer a { color: color-mix(in oklab, var(--paper) 80%, var(--ink)); border: none; }
.site-footer a:hover { color: var(--paper); }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1.4fr;
  gap: 40px;
}
@media (max-width: 880px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; }
}
.footer-col h5 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: color-mix(in oklab, var(--paper) 60%, var(--ink));
  font-weight: 500;
  margin-bottom: 16px;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.footer-brand {
  font-family: var(--font-display);
  font-size: 24px;
  color: var(--paper);
  margin-bottom: 12px;
  display: block;
}
.footer-legal {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid color-mix(in oklab, var(--paper) 12%, var(--ink));
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 12px;
  color: color-mix(in oklab, var(--paper) 50%, var(--ink));
}

/* ============================== UTILITY ================================== */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 880px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

.flex { display: flex; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.gap-24 { gap: 24px; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }

.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-48 { margin-top: 48px; }

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink-2);
  font-weight: 500;
}
.pill-accent { background: color-mix(in oklab, var(--accent) 12%, var(--paper)); border-color: color-mix(in oklab, var(--accent) 30%, var(--line)); color: var(--accent); }
.pill-ok { background: color-mix(in oklab, var(--ok) 12%, var(--paper)); border-color: color-mix(in oklab, var(--ok) 30%, var(--line)); color: var(--ok); }

/* ============================== TOAST =================================== */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--ink);
  color: var(--paper);
  padding: 14px 18px;
  border-radius: var(--radius);
  font-size: 14px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.18);
  z-index: 200;
  display: flex;
  align-items: center;
  gap: 12px;
  transform: translateY(20px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s, transform .2s;
}
.toast.show { opacity: 1; transform: translateY(0); pointer-events: auto; }
.toast a { color: var(--gold); border: none; font-weight: 500; }

/* ============================== TABLES =================================== */
.table {
  width: 100%;
  border-collapse: collapse;
}
.table th, .table td {
  text-align: left;
  padding: 14px 12px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  vertical-align: middle;
}
.table th {
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* ============================== PROSE (legal pages) ===================== */
.prose { font-size: 16px; line-height: 1.7; color: var(--ink-2); }
.prose h2 { font-size: 28px; margin-top: 2em; margin-bottom: 0.5em; color: var(--ink); }
.prose h3 { font-size: 20px; margin-top: 1.6em; margin-bottom: 0.4em; color: var(--ink); }
.prose ul, .prose ol { padding-left: 22px; margin: 0 0 1em; }
.prose li { margin-bottom: 0.4em; }
.prose strong { color: var(--ink); font-weight: 600; }
.prose hr { margin: 32px 0; }
.prose .last-updated {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 32px;
}

/* ============================== PROGRAM TILE ============================ */
.program-tile {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 14px;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .15s, transform .2s;
  text-decoration: none;
  color: inherit;
}
.program-tile:hover { border-color: var(--ink-3); transform: translateY(-2px); }
.program-tile .ph { aspect-ratio: 4/3; border: none; border-radius: 0; border-bottom: 1px solid var(--line); }
.program-tile-body { padding: 0 22px 22px; }
.program-tile h3 { font-size: 20px; margin-bottom: 6px; }
.program-tile .meta {
  display: flex;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 8px;
  padding: 22px 22px 0;
}

/* ============================== PRODUCT CARD =========================== */
.product-card {
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: border-color .15s, transform .2s;
}
.product-card:hover { border-color: var(--ink-3); transform: translateY(-2px); }
.product-card .ph { aspect-ratio: 1/1; border: none; border-radius: 0; border-bottom: 1px solid var(--line); min-height: 0; }
.product-card-body { padding: 18px 20px 20px; display: grid; gap: 6px; }
.product-card h3 { font-size: 17px; line-height: 1.3; margin: 0; font-family: var(--font-body); font-weight: 600; }
.product-card .category { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); }
.product-card .price { font-family: var(--font-display); font-size: 22px; color: var(--ink); margin-top: 4px; }
.product-card .price small { font-family: var(--font-mono); font-size: 11px; color: var(--ink-3); margin-left: 4px; }

/* ============================== STATS / FACTS ========================== */
.fact {
  border-left: 2px solid var(--accent);
  padding: 4px 0 4px 18px;
}
.fact .num {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.fact .label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-top: 8px;
}

/* ============================== BREADCRUMBS ============================ */
.crumbs {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.crumbs a { color: var(--ink-3); border: none; }
.crumbs a:hover { color: var(--brand); }
.crumbs span { margin: 0 8px; }

/* ============================== PAGE HEADER ============================ */
.page-header {
  padding: clamp(48px, 6vw, 80px) 0 clamp(32px, 4vw, 56px);
  border-bottom: 1px solid var(--line);
}
.page-header .eyebrow { margin-bottom: 16px; }
.page-header p.lede {
  font-size: clamp(17px, 1.6vw, 20px);
  color: var(--ink-2);
  max-width: 680px;
  margin-top: 16px;
}