/* ============================================================
   Chunshui 春水 — design system
   Light, watery, clinical-fresh. White + ice blue, cobalt drop.
   EN: Hanken Grotesk · CN: system serif/sans · Specs: IBM Plex Mono
   ============================================================ */

:root {
  --ink: #1a1c1f;
  --ink-soft: #3a4048;
  --grey: #6b7480;
  --drop: #2160e8;
  --drop-deep: #143ea8;
  --ice: #eaf3fb;
  --mist: #f7fafd;
  --line: #e2eaf1;
  --paper: #ffffff;

  --smooth: #a9cdf0;
  --double: #2160e8;
  --aloe: #7ec89a;

  --font-en: "Hanken Grotesk", "Helvetica Neue", Arial, sans-serif;
  --font-logo: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-cn-serif: "Songti SC", "Noto Serif CJK SC", "SimSun", serif;
  --font-cn: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "SF Mono", Menlo, monospace;

  --maxw: 1080px;
  --radius: 16px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  font-family: var(--font-en);
  font-size: 16.5px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}
html[lang="zh-CN"] body { font-family: var(--font-cn); }

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

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

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

/* ---------- Typography ---------- */

h1, h2, h3 {
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.18;
}
html[lang="zh-CN"] h1, html[lang="zh-CN"] h2 {
  font-family: var(--font-cn-serif);
  letter-spacing: 0.02em;
}

.lede { font-size: 17.5px; color: var(--grey); max-width: 58ch; }

.eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--drop);
  display: block;
  margin-bottom: 16px;
}

/* vertical bracketed CN label — the signature, borrowed from the bottle */
.v-label {
  writing-mode: vertical-rl;
  font-family: var(--font-cn-serif);
  font-size: 15px;
  letter-spacing: 0.34em;
  color: var(--ink-soft);
  user-select: none;
}

.mono { font-family: var(--font-mono); }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: inherit;
  font-weight: 600;
  font-size: 15px;
  line-height: 1;
  padding: 15px 28px;
  border-radius: 999px;
  border: 1.5px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}
.btn-blue { background: var(--drop); color: #fff; }
.btn-blue:hover { background: var(--drop-deep); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink); }
.btn-sm { padding: 10px 19px; font-size: 13.5px; }

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 30px;
  height: 70px;
}

.logo { display: flex; align-items: center; gap: 11px; text-decoration: none; flex: none; }
.logo-cn {
  font-family: var(--font-logo);
  font-weight: 900;
  font-size: 25px;
  line-height: 1;
  color: var(--ink);
  letter-spacing: 0.06em;
}
.logo svg { width: 13px; height: 18px; }

.main-nav { display: flex; gap: 26px; }
.main-nav a {
  text-decoration: none;
  font-size: 14.5px;
  font-weight: 550;
  color: var(--ink-soft);
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
}
.main-nav a:hover { color: var(--drop); }
.main-nav a[aria-current="page"] { color: var(--drop); border-bottom-color: var(--drop); }

.header-right { margin-left: auto; display: flex; align-items: center; gap: 14px; }

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
}
.lang-switch button {
  font-family: inherit;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 7px 13px;
  border: none;
  background: transparent;
  color: var(--grey);
  cursor: pointer;
}
.lang-switch button.active { background: var(--ink); color: #fff; }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span {
  display: block;
  width: 21px; height: 2px;
  background: var(--ink);
  margin: 5px 0;
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* ---------- Hero ---------- */

.hero {
  background: linear-gradient(180deg, var(--mist) 0%, var(--paper) 90%);
  overflow: hidden;
}
.hero .wrap {
  display: grid;
  grid-template-columns: auto 1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding-top: 72px;
  padding-bottom: 84px;
}

/* big vertical logotype, echoing the master logo lockup */
.hero-mark {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-family: var(--font-logo);
  font-weight: 900;
  font-size: 78px;
  line-height: 0.98;
  color: var(--ink);
  user-select: none;
}
.hero-mark svg { width: 44px; height: 60px; margin: 2px 0; }

.hero h1 {
  font-size: clamp(34px, 4.2vw, 52px);
  font-weight: 650;
  margin-bottom: 20px;
}
.hero h1 em { font-style: normal; color: var(--drop); }
.hero .lede { margin-bottom: 32px; }
.hero-ctas { display: flex; gap: 13px; flex-wrap: wrap; }

.hero-meta {
  display: flex;
  gap: 30px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
}
.hero-meta .num { font-size: 19px; font-weight: 600; display: block; color: var(--ink); }
.hero-meta .lab { font-size: 11px; letter-spacing: 0.09em; text-transform: uppercase; color: var(--grey); }

/* ---------- Image slots (drop-in) ---------- */

.ph {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 30% 10%, #ffffff 0%, var(--ice) 60%, #dcebf8 100%);
}
.ph img { width: 100%; height: 100%; object-fit: cover; }
.ph .ph-note { display: none; }
.ph.empty img { display: none; }
.ph.empty .ph-note {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  position: absolute;
  inset: 0;
  text-align: center;
  padding: 20px;
  color: var(--grey);
  font-size: 12.5px;
  font-family: var(--font-mono);
}
.ph.empty .ph-note svg { width: 30px; height: 42px; opacity: 0.5; }

.ph-tall { aspect-ratio: 3 / 3.6; }
.ph-wide { aspect-ratio: 16 / 9; }
.ph-square { aspect-ratio: 1 / 1; }

/* ---------- Sections ---------- */

section.band { padding: 84px 0; }
section.band-ice { background: var(--mist); }

.section-head { display: flex; align-items: flex-start; gap: 26px; margin-bottom: 44px; }
.section-head .v-label { flex: none; padding-top: 4px; }
.section-head h2 { font-size: clamp(26px, 3vw, 36px); }
.section-head .lede { margin-top: 10px; }

/* ---------- Product cards ---------- */

.prod-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.prod-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px 30px 30px;
  background: var(--paper);
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-decoration: none;
  transition: box-shadow 0.22s ease, transform 0.22s ease;
}
.prod-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 2px 4px rgba(26, 42, 74, 0.05), 0 20px 44px rgba(26, 42, 74, 0.1);
}
.prod-card .drop-glyph { width: 34px; height: 46px; }
.prod-card h3 { font-size: 21px; font-weight: 650; }
.prod-card .cn-name { font-family: var(--font-cn-serif); font-size: 14px; color: var(--grey); letter-spacing: 0.2em; }
.prod-card p { font-size: 14.5px; color: var(--grey); }
.prod-card .pc-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
}
.prod-card .pc-link { color: var(--drop); font-weight: 600; }

/* ---------- Product detail (products page) ---------- */

.variant {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
  align-items: center;
  padding: 72px 0;
  border-bottom: 1px solid var(--line);
}
.variant:last-of-type { border-bottom: none; }
.variant.flip .v-img { order: 2; }
.variant .drop-glyph { width: 40px; height: 54px; margin-bottom: 18px; }
.variant h2 { font-size: clamp(28px, 3vw, 38px); }
.variant .cn-name { font-family: var(--font-cn-serif); font-size: 16px; letter-spacing: 0.24em; color: var(--grey); display: block; margin: 6px 0 18px; }
.variant .desc { color: var(--ink-soft); margin-bottom: 26px; max-width: 52ch; }

.spec-table { width: 100%; border-collapse: collapse; font-size: 14px; max-width: 480px; }
.spec-table td { padding: 10px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
.spec-table td:first-child {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--grey);
  width: 40%;
  padding-right: 16px;
}

/* ---------- Feature / hygiene lists ---------- */

.feat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.feat {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 26px;
}
.feat h3 { font-size: 17px; font-weight: 650; margin-bottom: 8px; }
.feat p { font-size: 14px; color: var(--grey); }
.feat .feat-num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--drop);
  display: block;
  margin-bottom: 12px;
}

.check-list { list-style: none; display: grid; gap: 13px; margin: 24px 0 30px; }
.check-list li { display: flex; gap: 13px; align-items: flex-start; font-size: 15.5px; color: var(--ink-soft); }
.check-list li::before {
  content: "";
  flex: none;
  width: 9px; height: 12px;
  margin-top: 7px;
  background: var(--drop);
  clip-path: path("M4.5 0 C4.5 0 0 5.5 0 8.2 a4.5 4.5 0 0 0 9 0 C9 5.5 4.5 0 4.5 0 Z");
}

/* ---------- Split sections ---------- */

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.split h2 { font-size: clamp(26px, 3vw, 36px); margin-bottom: 16px; }

/* ---------- Factory gallery ---------- */

.fact-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 18px;
}
.fact-grid .ph:first-child { grid-row: span 2; aspect-ratio: auto; min-height: 420px; }

/* ---------- Contact ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 56px;
  align-items: start;
}
.info-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 26px;
  margin-bottom: 16px;
}
.info-card .ic-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--drop);
  display: block;
  margin-bottom: 8px;
}
.info-card p, .info-card a { font-size: 15.5px; color: var(--ink-soft); }
.info-card a { text-decoration: none; }
.info-card a:hover { color: var(--drop); }
.map-frame { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.map-frame iframe { display: block; width: 100%; height: 300px; border: 0; }

/* ---------- CTA banner ---------- */

.cta-banner {
  background: linear-gradient(135deg, var(--drop) 0%, var(--drop-deep) 100%);
  border-radius: calc(var(--radius) + 6px);
  color: #fff;
  padding: 58px 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
  position: relative;
  overflow: hidden;
}
.cta-banner::after {
  content: "";
  position: absolute;
  right: -50px; top: -90px;
  width: 260px; height: 340px;
  background: rgba(255, 255, 255, 0.08);
  clip-path: path("M130 0 C130 0 10 150 10 226 a120 120 0 0 0 240 0 C250 150 130 0 130 0 Z");
}
.cta-banner h2 { font-size: clamp(24px, 2.8vw, 34px); margin-bottom: 8px; }
.cta-banner p { color: rgba(255, 255, 255, 0.82); font-size: 15px; max-width: 46ch; }
.cta-banner .btn { background: #fff; color: var(--drop-deep); flex: none; position: relative; z-index: 1; }
.cta-banner .btn:hover { transform: translateY(-1px); }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--mist);
  margin-top: 90px;
  padding: 56px 0 0;
  font-size: 14.5px;
  color: var(--grey);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 44px;
}
.footer-col h4 {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 16px;
}
.footer-col ul { list-style: none; display: grid; gap: 10px; }
.footer-col a { text-decoration: none; }
.footer-col a:hover { color: var(--drop); }
.footer-note { max-width: 36ch; margin-top: 14px; font-size: 13.5px; }
.footer-bottom {
  border-top: 1px solid var(--line);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 12.5px;
}

/* ---------- Page hero (inner) ---------- */

.page-hero {
  background: linear-gradient(180deg, var(--mist) 0%, var(--paper) 100%);
  padding: 64px 0 52px;
  border-bottom: 1px solid var(--line);
}
.page-hero .wrap { display: flex; gap: 30px; align-items: flex-start; }
.page-hero h1 { font-size: clamp(30px, 3.8vw, 46px); font-weight: 650; margin-bottom: 14px; }
.page-hero .lede { max-width: 60ch; }

/* ---------- Reveal ---------- */

html.js .reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.55s ease, transform 0.55s ease; }
html.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html.js .reveal { opacity: 1; transform: none; }
}

/* ---------- Responsive ---------- */

@media (max-width: 960px) {
  .hero .wrap { grid-template-columns: 1fr 0.9fr; }
  .hero-mark { display: none; }
  .prod-grid, .feat-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  .hero .wrap { grid-template-columns: 1fr; padding-top: 52px; padding-bottom: 60px; }
  .variant, .split, .contact-grid { grid-template-columns: 1fr; gap: 34px; }
  .variant.flip .v-img { order: 0; }
  .fact-grid { grid-template-columns: 1fr; }
  .fact-grid .ph:first-child { grid-row: auto; min-height: 0; aspect-ratio: 16/10; }
  .cta-banner { flex-direction: column; align-items: flex-start; padding: 40px 32px; }
  .section-head .v-label { display: none; }

  .main-nav { display: none; }
  .nav-toggle { display: block; }
  .header-right .btn { display: none; }
  .site-header.nav-open .main-nav {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 70px; left: 0; right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 16px 24px 22px;
    gap: 2px;
  }
  .site-header.nav-open .main-nav a { padding: 11px 2px; font-size: 16px; border-bottom: none; }
  .site-header.nav-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .site-header.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
  .site-header.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

@media (max-width: 560px) {
  .prod-grid, .feat-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  section.band { padding: 60px 0; }
  .hero-meta { flex-wrap: wrap; gap: 18px; }
}