/* ===== Reset & base ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --color-bg: #F6F7F9;
  --color-surface: #FFFFFF;
  --color-ink: #12141C;
  --color-slate: #4B5566;
  --color-signal: #2B59E0;
  --color-signal-dark: #1E44B8;
  --color-flag: #C4271F;
  --color-border: #E1E4EA;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Public Sans', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --max-width: 1180px;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-ink);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
html { scroll-behavior: smooth; }

:focus-visible { outline: 2px solid var(--color-signal); outline-offset: 3px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  border-radius: 3px;
  transition: background 0.15s ease, color 0.15s ease;
}
.btn-primary { background: var(--color-signal); color: #fff; }
.btn-primary:hover { background: var(--color-signal-dark); }
.btn-primary:disabled { background: var(--color-border); color: var(--color-slate); cursor: not-allowed; }
.btn-outline { border: 1.5px solid var(--color-ink); color: var(--color-ink); }
.btn-outline:hover { background: var(--color-ink); color: #fff; }

/* ===== Header ===== */
.site-header { position: sticky; top: 0; z-index: 50; background: var(--color-surface); border-bottom: 1px solid var(--color-border); }

.ruo-bar {
  background: var(--color-flag);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-align: center;
  padding: 6px 12px;
}

.header-inner { max-width: var(--max-width); margin: 0 auto; padding: 16px 24px; display: flex; align-items: center; justify-content: space-between; }

.logo { display: flex; align-items: center; }
.logo-img { height: 52px; width: auto; display: block; }

.main-nav { display: flex; gap: 24px; }
.main-nav a { font-size: 0.88rem; font-weight: 500; color: var(--color-slate); }
.main-nav a:hover { color: var(--color-ink); }

.cart-toggle { position: relative; display: flex; align-items: center; justify-content: center; width: 38px; height: 38px; color: var(--color-ink); }
.cart-count {
  position: absolute; top: -2px; right: -2px; min-width: 18px; height: 18px; padding: 0 4px;
  border-radius: 50%; background: var(--color-signal); color: #fff;
  font-family: var(--font-mono); font-size: 0.65rem; display: flex; align-items: center; justify-content: center;
}

/* ===== Hero ===== */
.hero { position: relative; padding: 88px 24px 0; text-align: center; overflow: hidden; }
.hero-content { max-width: 620px; margin: 0 auto; position: relative; z-index: 1; }

.hero-eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-flag);
  border: 1px solid var(--color-flag);
  padding: 4px 10px;
  border-radius: 2px;
  margin-bottom: 22px;
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.1rem, 5.5vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin-bottom: 18px;
}

.hero p { font-size: 1.02rem; color: var(--color-slate); max-width: 460px; margin: 0 auto 30px; }

.trace { width: 100%; height: auto; display: block; margin-top: 32px; }
.trace-baseline { stroke: var(--color-border); stroke-width: 1; }
.trace-line { fill: none; stroke: var(--color-signal); stroke-width: 1.5; }

/* ===== Products ===== */
.products { max-width: var(--max-width); margin: 0 auto; padding: 64px 24px 96px; }

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-signal);
  margin-bottom: 10px;
}

.products h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  margin-bottom: 36px;
}

.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 24px; }

.product-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: 4px; padding: 22px; display: flex; flex-direction: column; gap: 10px; transition: box-shadow 0.2s ease, transform 0.2s ease; }
.product-card:hover { transform: translateY(-3px); box-shadow: 0 10px 22px rgba(18, 20, 28, 0.06); }

.product-info h3 { font-family: var(--font-body); font-weight: 600; font-size: 1.02rem; }

.product-sequence {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-slate);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  padding: 8px 10px;
  word-break: break-word;
  line-height: 1.4;
}

.product-spec { font-family: var(--font-mono); font-size: 0.74rem; color: var(--color-slate); }

.product-footer { margin-top: auto; padding-top: 8px; display: flex; align-items: center; justify-content: space-between; }
.product-price { font-family: var(--font-mono); font-weight: 600; font-size: 1.05rem; }

.btn-add {
  font-family: var(--font-body); font-weight: 600; font-size: 0.8rem;
  padding: 8px 14px; border: 1.5px solid var(--color-ink); border-radius: 3px;
  transition: background 0.15s ease, color 0.15s ease;
}
.btn-add:hover { background: var(--color-ink); color: #fff; }

/* ===== CoA ===== */
.coa { max-width: var(--max-width); margin: 0 auto; padding: 0 24px 96px; }
.coa h2 { font-family: var(--font-display); font-weight: 700; font-size: clamp(1.6rem, 3.5vw, 2.2rem); margin-bottom: 28px; }

.coa-list { display: flex; flex-direction: column; border-top: 1px solid var(--color-border); }
.coa-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 4px; border-bottom: 1px solid var(--color-border);
}
.coa-name { font-weight: 600; font-size: 0.95rem; }

.btn-coa {
  background: var(--color-signal); color: #fff;
  padding: 8px 18px; font-size: 0.82rem; font-weight: 600; border-radius: 3px;
}
.btn-coa:hover { background: var(--color-signal-dark); }

/* ===== FAQ ===== */
.faq { max-width: var(--max-width); margin: 0 auto; padding: 0 24px 96px; }
.faq h2 { font-family: var(--font-display); font-weight: 700; font-size: clamp(1.6rem, 3.5vw, 2.2rem); margin-bottom: 28px; }

.faq-list { display: flex; flex-direction: column; gap: 10px; max-width: 760px; }

.faq-item {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: 4px; padding: 4px 20px;
}

.faq-question {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 16px 0; font-weight: 600; font-size: 0.98rem; cursor: pointer;
  list-style: none;
}
.faq-question::-webkit-details-marker { display: none; }

.faq-icon { position: relative; width: 16px; height: 16px; flex-shrink: 0; }
.faq-icon::before, .faq-icon::after {
  content: ''; position: absolute; background: var(--color-ink);
  transition: transform 0.2s ease;
}
.faq-icon::before { top: 7px; left: 0; width: 16px; height: 2px; }
.faq-icon::after { top: 0; left: 7px; width: 2px; height: 16px; }
.faq-item[open] .faq-icon::after { transform: rotate(90deg); opacity: 0; }

.faq-answer { color: var(--color-slate); font-size: 0.9rem; padding-bottom: 18px; }

/* ===== Footer ===== */
.site-footer { padding: 56px 24px 32px; border-top: 1px solid var(--color-border); }
.footer-inner { max-width: var(--max-width); margin: 0 auto; }
.footer-brand { font-family: var(--font-display); font-weight: 700; font-size: 1.1rem; margin-bottom: 14px; }
.footer-disclaimer { font-size: 0.82rem; color: var(--color-slate); max-width: 640px; margin-bottom: 24px; }
.footer-links { display: flex; gap: 20px; flex-wrap: wrap; margin-bottom: 20px; }
.footer-links a { font-size: 0.82rem; color: var(--color-slate); }
.footer-links a:hover { color: var(--color-ink); }
.footer-copy { font-family: var(--font-mono); font-size: 0.7rem; color: var(--color-slate); }

/* ===== Cart drawer ===== */
.cart-overlay { position: fixed; inset: 0; background: rgba(18, 20, 28, 0.4); opacity: 0; pointer-events: none; transition: opacity 0.25s ease; z-index: 90; }
.cart-overlay.open { opacity: 1; pointer-events: auto; }

.cart-drawer {
  position: fixed; top: 0; right: 0; height: 100%; width: min(420px, 100vw);
  background: var(--color-surface); transform: translateX(100%); transition: transform 0.3s ease;
  z-index: 100; display: flex; flex-direction: column;
}
.cart-drawer.open { transform: translateX(0); }

.cart-header { display: flex; align-items: center; justify-content: space-between; padding: 20px 24px; border-bottom: 1px solid var(--color-border); }
.cart-header h3 { font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; }
.cart-close { font-size: 1.5rem; line-height: 1; color: var(--color-slate); width: 32px; height: 32px; }

.cart-items { flex: 1; overflow-y: auto; padding: 16px 24px; }
.cart-empty { color: var(--color-slate); font-size: 0.9rem; padding: 24px 0; }

.cart-item { padding: 14px 0; border-bottom: 1px solid var(--color-border); }
.cart-item h4 { font-size: 0.9rem; font-weight: 600; margin-bottom: 4px; }
.cart-item .cart-item-spec { font-family: var(--font-mono); font-size: 0.72rem; color: var(--color-slate); margin-bottom: 8px; display: block; }
.cart-item .cart-item-price { font-family: var(--font-mono); font-size: 0.85rem; }

.qty-control { display: flex; align-items: center; gap: 10px; margin-top: 8px; }
.qty-btn { width: 24px; height: 24px; border: 1px solid var(--color-border); font-family: var(--font-mono); display: flex; align-items: center; justify-content: center; }
.qty-control span { font-family: var(--font-mono); font-size: 0.85rem; }

.cart-footer { padding: 18px 24px 22px; border-top: 1px solid var(--color-border); }
.cart-subtotal-row { display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: 1rem; margin-bottom: 16px; }

.ruo-confirm { display: flex; align-items: flex-start; gap: 8px; font-size: 0.76rem; color: var(--color-slate); margin-bottom: 14px; cursor: pointer; }
.ruo-confirm input { margin-top: 2px; accent-color: var(--color-flag); flex-shrink: 0; }

.btn-checkout { width: 100%; }
.cart-note { font-size: 0.74rem; color: var(--color-slate); text-align: center; margin-top: 10px; }

/* ===== Age gate ===== */
.age-gate {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(18, 20, 28, 0.72);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
}
.age-gate[hidden] { display: none; }

.age-gate-box {
  background: var(--color-surface); border-radius: 6px; padding: 36px 32px;
  max-width: 420px; width: 100%; text-align: center;
  box-shadow: 0 20px 50px rgba(18, 20, 28, 0.3);
}
.age-gate-box h2 { font-family: var(--font-display); font-weight: 700; font-size: 1.4rem; margin-bottom: 14px; }
.age-gate-box p { color: var(--color-slate); font-size: 0.92rem; margin-bottom: 10px; }
.age-gate-question { color: var(--color-ink) !important; font-weight: 600; margin-top: 14px; margin-bottom: 22px !important; }
.age-gate-actions { display: flex; gap: 14px; justify-content: center; }
.age-gate-actions .btn { flex: 1; }

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .header-inner { padding: 12px 18px; }
  .main-nav { display: none; }
  .hero { padding: 56px 20px 0; }
  .products { padding: 48px 18px 72px; }
  .product-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .product-card { padding: 14px; }
  .cart-drawer { width: 100vw; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}