/* ==========================================================================
   Heilebär — shared design system
   One stylesheet for the whole site. Section order:
   1. Tokens  2. Reset  3. Type  4. Layout helpers  5. Header/Nav
   6. Buttons  7. Hero  8. Sections & content patterns  9. Product components
   10. Forms  11. Footer  12. Utilities  13. Responsive
   ========================================================================== */

/* ---------- 1. Tokens ---------- */
:root {
  /* Neutral shell */
  --ink: #1C1E24;
  --ink-soft: #4A4E5A;
  --muted: #6B7080;
  --paper: #FBFAF7;
  --paper-alt: #F4F1EA;
  --white: #FFFFFF;
  --line: #E6E2D8;

  /* Calcium line — blue */
  --blue-deep: #0E5A9E;
  --blue-mid: #1C97D4;
  --blue-pale: #E3F1FA;
  --blue-ink: #0B3A63;

  /* Lutein line — orange */
  --orange-deep: #DE5A2C;
  --orange-mid: #EE8C4E;
  --orange-pale: #FBEAD6;
  --orange-ink: #7A2E12;

  /* Semantic */
  --focus-ring: #0E5A9E;
  --success: #1E7A4C;
  --error: #B3261E;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 18px;

  --container: 1220px;
  --container-narrow: 820px;

  --shadow-sm: 0 1px 2px rgba(28,30,36,0.06), 0 1px 1px rgba(28,30,36,0.04);
  --shadow-md: 0 8px 24px rgba(28,30,36,0.08);

  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Helvetica Neue", "Microsoft YaHei", "Hiragino Sans GB", Arial, sans-serif;
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; overflow-x: hidden; }
body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden; /* belt-and-braces: the off-canvas mobile nav panel is
    position:fixed + translateX(100%), which some browsers still count
    toward document scrollWidth even though it is never visible. */
}
img { max-width: 100%; display: block; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { padding: 0; margin: 0; list-style: none; }
h1, h2, h3, h4, p, figure { margin: 0; }
button { font: inherit; background: none; border: 0; cursor: pointer; color: inherit; }
input, textarea, select { font: inherit; }

:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
  border-radius: 2px;
}

.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: 1rem; top: 1rem;
  transform: translateY(-8rem);
  background: var(--ink); color: var(--white);
  padding: .6rem 1rem; border-radius: var(--radius-sm);
  transition: transform .15s ease; z-index: 200;
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 3. Type ---------- */
h1, .h1 { font-size: clamp(2rem, 1.5rem + 2.2vw, 3.4rem); font-weight: 800; line-height: 1.12; letter-spacing: -0.01em; }
h2, .h2 { font-size: clamp(1.5rem, 1.25rem + 1.1vw, 2.25rem); font-weight: 800; line-height: 1.2; letter-spacing: -0.01em; }
h3, .h3 { font-size: clamp(1.15rem, 1.05rem + 0.4vw, 1.4rem); font-weight: 700; line-height: 1.35; }
.lead { font-size: clamp(1.05rem, 1rem + 0.3vw, 1.25rem); color: var(--ink-soft); line-height: 1.65; }
.eyebrow {
  display: inline-flex; align-items: center; gap: .5em;
  font-size: .8rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase;
  color: var(--blue-deep);
}
[lang="zh-Hans"] .eyebrow, html[lang="zh-Hans"] .eyebrow { letter-spacing: .04em; }
.accent-orange .eyebrow { color: var(--orange-deep); }
small, .small { font-size: .875rem; }
.muted { color: var(--muted); }

/* ---------- 4. Layout helpers ---------- */
.wrap { max-width: var(--container); margin: 0 auto; padding: 0 1.5rem; }
.wrap--narrow { max-width: var(--container-narrow); }
.section { padding: 4.5rem 0; }
.section--tight { padding: 3rem 0; }
.section--tint { background: var(--paper-alt); }
.section--ink { background: var(--ink); color: var(--white); }
.section__head { max-width: 720px; margin-bottom: 2.5rem; }
.section__head + .section__head { margin-top: 0; }
.stack { display: flex; flex-direction: column; gap: 1rem; }
.grid-2 { display: grid; grid-template-columns: 1fr; gap: 2.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }

/* Editorial image+text split */
.split { display: grid; grid-template-columns: 1fr; gap: 2.5rem; align-items: center; }
.split__media img { border-radius: var(--radius-lg); }
.split--reverse .split__media { order: -1; }

/* ---------- 5. Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(251,250,247,0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header__row { display: flex; align-items: center; justify-content: space-between; height: 72px; }

.brand-mark { display: inline-flex; align-items: center; gap: .55rem; color: var(--ink); }
.brand-mark__icon { color: var(--blue-deep); display: inline-flex; line-height: 0; }
.brand-mark__word { font-size: 1.35rem; font-weight: 800; letter-spacing: -0.01em; }
.brand-mark--footer { color: var(--white); margin-bottom: .75rem; }
.brand-mark--footer .brand-mark__icon { color: var(--white); }

.nav-toggle { display: flex; flex-direction: column; gap: 5px; padding: .5rem; z-index: 110; }
.nav-toggle__bar { width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .2s ease, opacity .2s ease; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.primary-nav {
  position: fixed; inset: 72px 0 0 0; background: var(--paper);
  display: flex; flex-direction: column; justify-content: space-between;
  padding: 1.5rem; transform: translateX(100%); transition: transform .25s ease;
  overflow-y: auto;
}
.primary-nav.is-open { transform: translateX(0); }
.primary-nav ul { display: flex; flex-direction: column; gap: .25rem; }
.primary-nav a { display: block; padding: .9rem .25rem; font-weight: 600; font-size: 1.1rem; border-bottom: 1px solid var(--line); }
.primary-nav a.is-active { color: var(--blue-deep); }
.lang-switch {
  align-self: flex-start; margin-top: 1.25rem;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: .5rem .9rem; font-weight: 700; font-size: .85rem;
}

/* ---------- 6. Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  padding: .85rem 1.5rem; border-radius: var(--radius-sm);
  font-weight: 700; font-size: .95rem; line-height: 1.2;
  border: 1px solid transparent; transition: background .15s ease, color .15s ease, border-color .15s ease, transform .1s ease;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--blue-deep); color: var(--white); }
.btn--primary:hover { background: var(--blue-ink); }
.accent-orange .btn--primary { background: var(--orange-deep); }
.accent-orange .btn--primary:hover { background: var(--orange-ink); }
.btn--ghost { border-color: var(--line); color: var(--ink); background: transparent; }
.btn--ghost:hover { border-color: var(--ink); }
.btn--on-dark { border-color: rgba(255,255,255,0.35); color: var(--white); }
.btn--on-dark:hover { border-color: var(--white); background: rgba(255,255,255,0.08); }
.btn--sm { padding: .6rem 1rem; font-size: .85rem; }
.btn--block { width: 100%; }

/* ---------- 7. Hero ---------- */
.hero { padding: 3rem 0 4rem; }
.hero__grid { display: grid; grid-template-columns: 1fr; gap: 2.5rem; align-items: center; }
.hero__title { margin: .75rem 0 1.1rem; }
.hero__actions { display: flex; flex-wrap: wrap; gap: .9rem; margin-top: 1.75rem; }
.hero__visual { position: relative; }
.hero__visual-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
}
.hero__visual-grid img { border-radius: var(--radius-lg); background: var(--white); box-shadow: var(--shadow-sm); padding: 1rem; }
.hero__visual-grid > :nth-child(2) { margin-top: 2rem; }
.hero__visual-grid > :nth-child(3) { margin-top: -1rem; }

/* ---------- 8. Content patterns ---------- */
.credibility-strip {
  display: grid; grid-template-columns: repeat(2,1fr); gap: 1.75rem 1.5rem;
  padding: 2rem 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.credibility-strip__item { display: flex; flex-direction: column; gap: .3rem; }
.credibility-strip__item .num { font-size: 1.6rem; font-weight: 800; color: var(--blue-deep); }
.credibility-strip__item .label { font-size: .9rem; color: var(--muted); }

.numbered-list { counter-reset: item; display: flex; flex-direction: column; }
.numbered-list__item {
  counter-increment: item; display: grid; grid-template-columns: 44px 1fr;
  gap: 1.1rem; padding: 1.6rem 0; border-top: 1px solid var(--line);
}
.numbered-list__item:last-child { border-bottom: 1px solid var(--line); }
.numbered-list__item::before {
  content: counter(item, decimal-leading-zero);
  font-weight: 800; font-size: 1rem; color: var(--blue-deep);
}
.accent-orange .numbered-list__item::before { color: var(--orange-deep); }

.badge {
  display: inline-flex; align-items: center; padding: .3rem .7rem;
  border-radius: 999px; font-size: .78rem; font-weight: 600;
  background: var(--blue-pale); color: var(--blue-ink); border: 1px solid rgba(14,90,158,0.15);
}
.badge--warn { background: #FBEAE6; color: #7A2415; border-color: rgba(179,38,30,0.18); }
.badge-row { display: flex; flex-wrap: wrap; gap: .5rem; }

.stat-block { text-align: left; }
.stat-block .value { font-size: 2.2rem; font-weight: 800; color: var(--blue-deep); line-height: 1; }
.accent-orange .stat-block .value { color: var(--orange-deep); }
.stat-block .label { margin-top: .5rem; color: var(--muted); font-size: .95rem; }

.callout {
  border-left: 3px solid var(--blue-deep); background: var(--blue-pale);
  padding: 1.25rem 1.5rem; border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: .95rem; color: var(--blue-ink);
}
.accent-orange .callout { border-color: var(--orange-deep); background: var(--orange-pale); color: var(--orange-ink); }

.disclaimer-box {
  border: 1px solid var(--line); border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem; font-size: .875rem; color: var(--muted); background: var(--white);
}

/* ---------- 9. Product components ---------- */
.product-grid { display: grid; grid-template-columns: 1fr; gap: 1.5rem; }
.product-card {
  display: flex; flex-direction: column; background: var(--white);
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  overflow: hidden; transition: box-shadow .15s ease, transform .15s ease;
}
.product-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.product-card__media { background: var(--blue-pale); padding: 2rem 2rem 1rem; }
.product-card--orange .product-card__media { background: var(--orange-pale); }
.product-card__body { padding: 1.5rem; display: flex; flex-direction: column; gap: .6rem; flex: 1; }
.product-card__age { font-size: .8rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; color: var(--blue-deep); }
.product-card--orange .product-card__age { color: var(--orange-deep); }
.product-card__name { font-size: 1.15rem; font-weight: 800; }
.product-card__tagline { color: var(--ink-soft); font-size: .95rem; flex: 1; }
.product-card__cta { margin-top: .5rem; }

.factor-groups { display: flex; flex-direction: column; gap: 1.75rem; }
.factor-group { border: 1px solid var(--line); border-radius: var(--radius-md); overflow: hidden; background: var(--white); }
.factor-group__label {
  padding: .9rem 1.25rem; font-weight: 800; font-size: 1rem;
  background: var(--blue-pale); color: var(--blue-ink);
}
.accent-orange .factor-group__label { background: var(--orange-pale); color: var(--orange-ink); }
.factor-table { width: 100%; border-collapse: collapse; }
.factor-table td { padding: .7rem 1.25rem; border-top: 1px solid var(--line); font-size: .95rem; }
.factor-table tr:first-child td { border-top: 0; }
.factor-table td:last-child { text-align: right; font-weight: 700; white-space: nowrap; color: var(--ink); }
.factor-group__note { padding: .75rem 1.25rem 1rem; font-size: .82rem; color: var(--muted); border-top: 1px solid var(--line); }

.product-hero { display: grid; grid-template-columns: 1fr; gap: 2.5rem; align-items: center; padding: 2.5rem 0; }
.product-hero__media { background: var(--blue-pale); border-radius: var(--radius-lg); padding: 2.5rem; display: flex; gap: 1.5rem; align-items: flex-end; justify-content: center; }
.accent-orange .product-hero__media { background: var(--orange-pale); }
.product-hero__media img:first-child { max-width: 62%; }
.product-hero__media img:last-child { max-width: 32%; }
.meta-row { display: flex; flex-wrap: wrap; gap: 1.5rem; margin: 1.25rem 0; }
.meta-row__item .k { font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.meta-row__item .v { font-weight: 700; }

.product-switch { display: flex; flex-wrap: wrap; gap: .6rem; margin-bottom: 2rem; }
.product-switch a {
  padding: .6rem 1rem; border: 1px solid var(--line); border-radius: 999px; font-size: .88rem; font-weight: 600;
}
.product-switch a.is-active { background: var(--ink); color: var(--white); border-color: var(--ink); }

/* ---------- 10. Forms ---------- */
.form { display: flex; flex-direction: column; gap: 1.25rem; max-width: 640px; }
.field { display: flex; flex-direction: column; gap: .4rem; }
.field label { font-weight: 700; font-size: .92rem; }
.field .req { color: var(--error); }
.field input, .field textarea, .field select {
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: .8rem .9rem; background: var(--white); color: var(--ink); width: 100%;
}
.field textarea { min-height: 140px; resize: vertical; }
.field input:invalid[data-touched="true"] { border-color: var(--error); }
.field__error { color: var(--error); font-size: .85rem; display: none; }
.field.has-error .field__error { display: block; }
.field.has-error input, .field.has-error textarea { border-color: var(--error); }
.field__hint { font-size: .82rem; color: var(--muted); }
.hp-field { position: absolute; left: -9999px; top: -9999px; }
.form-message { padding: 1rem 1.2rem; border-radius: var(--radius-md); font-size: .95rem; display: none; }
.form-message.is-visible { display: block; }
.form-message--success { background: #E7F5EC; color: var(--success); border: 1px solid rgba(30,122,76,.25); }
.form-message--error { background: #FBEAE8; color: var(--error); border: 1px solid rgba(179,38,30,.25); }

/* ---------- 11. Accordion (FAQ) ---------- */
.accordion { border-top: 1px solid var(--line); }
.accordion__item { border-bottom: 1px solid var(--line); }
.accordion__trigger {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 1.25rem .25rem; text-align: left; font-weight: 700; font-size: 1.02rem;
}
.accordion__icon { flex-shrink: 0; width: 20px; height: 20px; position: relative; }
.accordion__icon::before, .accordion__icon::after {
  content: ''; position: absolute; background: var(--ink); border-radius: 2px; top: 50%; left: 50%;
}
.accordion__icon::before { width: 14px; height: 2px; transform: translate(-50%,-50%); }
.accordion__icon::after { width: 2px; height: 14px; transform: translate(-50%,-50%); transition: transform .18s ease; }
.accordion__trigger[aria-expanded="true"] .accordion__icon::after { transform: translate(-50%,-50%) rotate(90deg); opacity: 0; }
.accordion__panel { max-height: 0; overflow: hidden; transition: max-height .22s ease; }
.accordion__panel-inner { padding: 0 .25rem 1.4rem; color: var(--ink-soft); font-size: .96rem; }

/* ---------- 12. Footer ---------- */
.site-footer { background: var(--ink); color: rgba(255,255,255,0.82); padding-top: 3.5rem; }
.site-footer__grid { display: grid; grid-template-columns: 1fr; gap: 2.5rem; padding-bottom: 2.5rem; }
.site-footer h2 { font-size: .85rem; text-transform: uppercase; letter-spacing: .05em; color: rgba(255,255,255,0.5); margin-bottom: 1rem; }
.site-footer__nav ul, .site-footer__contact ul { display: flex; flex-direction: column; gap: .65rem; }
.site-footer__nav a:hover, .site-footer__contact a:hover { color: var(--white); }
.site-footer__tagline { font-size: .92rem; max-width: 30ch; color: rgba(255,255,255,0.65); }
.footer-stores { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 1.25rem; }
.site-footer__legal { border-top: 1px solid rgba(255,255,255,0.14); padding: 1.75rem 0 2.25rem; }
.footer-disclaimer { font-size: .8rem; color: rgba(255,255,255,0.55); max-width: 90ch; margin-bottom: 1rem; }
.footer-copyright { font-size: .8rem; color: rgba(255,255,255,0.4); }

/* ---------- 13. Utilities ---------- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.visually-hide-mobile { display: none; }

/* ---------- 14. Responsive ---------- */
/* Tablet — 768px */
@media (min-width: 700px) {
  .grid-2 { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
  .product-grid { grid-template-columns: 1fr 1fr; }
  .credibility-strip { grid-template-columns: repeat(4, 1fr); }
  .hero__grid { grid-template-columns: 1.05fr .95fr; }
  .split { grid-template-columns: 1fr 1fr; }
  .split--reverse .split__media { order: 2; }
  .product-hero { grid-template-columns: .9fr 1.1fr; }
  .visually-hide-mobile { display: initial; }
}

/* Laptop / Desktop nav — 1000px */
@media (min-width: 1000px) {
  .nav-toggle { display: none; }
  .primary-nav {
    position: static; transform: none; padding: 0; background: transparent;
    flex-direction: row; align-items: center; gap: 2rem; inset: auto;
  }
  .primary-nav ul { flex-direction: row; gap: 1.75rem; }
  .primary-nav a { padding: .3rem 0; border-bottom: 2px solid transparent; font-size: .98rem; }
  .primary-nav a.is-active { border-bottom-color: var(--blue-deep); color: var(--blue-deep); }
  .lang-switch { margin-top: 0; }
  .product-grid { grid-template-columns: repeat(4, 1fr); }
}

/* Desktop — 1440px: roomier rhythm */
@media (min-width: 1300px) {
  .section { padding: 6rem 0; }
  .hero { padding: 4.5rem 0 6rem; }
}