/* ==================================================================
   端云化工 DUANYUN CHEMICAL — 站点样式
   Design system: 深青石墨 + 薄荷青绿点缀 / 现代企业站
   ================================================================== */

/* ---------- 1. Design tokens ---------- */
:root {
  --ink: #08202a;
  --ink-soft: #12323d;
  --primary: #0f3b4a;
  --primary-600: #14566a;
  --primary-700: #0b2b36;
  --accent: #00a98f;
  --accent-600: #008f79;
  --accent-soft: #6fe3ce;
  --bg: #ffffff;
  --bg-soft: #f3f7f6;
  --bg-mist: #e9f1ef;
  --line: #e0e8e6;
  --line-dark: rgba(255, 255, 255, 0.14);
  --text: #0d232b;
  --muted: #5b737a;
  --muted-light: #8ba2a7;

  --radius-s: 6px;
  --radius: 12px;
  --radius-l: 20px;

  --shadow-s: 0 2px 10px rgba(9, 38, 47, 0.06);
  --shadow: 0 18px 45px -22px rgba(9, 38, 47, 0.35);
  --shadow-l: 0 40px 80px -40px rgba(9, 38, 47, 0.45);

  --container: 1240px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --header-h: 84px;

  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body.nav-open { overflow: hidden; }

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
h1, h2, h3, h4, p { margin: 0; }

::selection { background: var(--accent); color: #fff; }

/* ---------- 3. Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}

.section { padding: 110px 0; position: relative; }
.section--tight { padding: 80px 0; }
.section--soft { background: var(--bg-soft); }
.section--dark { background: var(--ink); color: #e9f2f0; }
.section--dark .section-title { color: #fff; }
.section--dark .section-sub { color: rgba(233, 242, 240, 0.66); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-600);
  margin-bottom: 20px;
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}
.section--dark .eyebrow { color: var(--accent-soft); }

.section-title {
  font-size: clamp(28px, 3.4vw, 44px);
  line-height: 1.28;
  letter-spacing: -0.015em;
  font-weight: 700;
  color: var(--primary-700);
}

.section-sub {
  margin-top: 18px;
  max-width: 620px;
  color: var(--muted);
  font-size: 16.5px;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 56px;
}
.section-head .section-sub { margin-top: 16px; }

.head-link {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--primary);
  padding-bottom: 4px;
  border-bottom: 1px solid var(--line);
  transition: color 0.25s, border-color 0.25s;
}
.head-link svg { transition: transform 0.3s var(--ease); }
.head-link:hover { color: var(--accent-600); border-color: var(--accent); }
.head-link:hover svg { transform: translateX(5px); }

/* ---------- 4. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  height: 52px;
  padding: 0 30px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: transform 0.3s var(--ease), background 0.3s, color 0.3s,
    box-shadow 0.3s, border-color 0.3s;
  white-space: nowrap;
}
.btn svg { transition: transform 0.3s var(--ease); }
.btn:hover svg { transform: translateX(4px); }

.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 14px 30px -14px rgba(0, 169, 143, 0.75);
}
.btn--primary:hover {
  background: var(--accent-600);
  transform: translateY(-2px);
  box-shadow: 0 20px 36px -16px rgba(0, 169, 143, 0.8);
}

.btn--ghost {
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(4px);
}
.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.6);
  transform: translateY(-2px);
}

.btn--outline {
  color: var(--primary);
  border: 1px solid var(--line);
  background: #fff;
}
.btn--outline:hover {
  border-color: var(--accent);
  color: var(--accent-600);
  transform: translateY(-2px);
  box-shadow: var(--shadow-s);
}

.btn--sm { height: 44px; padding: 0 22px; font-size: 14px; }

/* ---------- 5. Header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 90;
  height: var(--header-h);
  display: flex;
  align-items: center;
  transition: background 0.35s, box-shadow 0.35s, height 0.35s,
    border-color 0.35s;
  border-bottom: 1px solid transparent;
}

.site-header.is-solid {
  height: 72px;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
  box-shadow: 0 10px 30px -24px rgba(8, 32, 42, 0.5);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

/* Logo */
.logo { display: flex; align-items: center; gap: 12px; flex: none; }
.logo__mark { width: 40px; height: 40px; flex: none; }
.logo__mark .hex { fill: var(--accent); }
.logo__mark .dot { fill: #fff; }

.logo__text { display: flex; flex-direction: column; line-height: 1.1; }
.logo__cn {
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: #fff;
  transition: color 0.35s;
}
.logo__en {
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.26em;
  color: rgba(255, 255, 255, 0.62);
  margin-top: 4px;
  transition: color 0.35s;
}
.site-header.is-solid .logo__cn { color: var(--primary-700); }
.site-header.is-solid .logo__en { color: var(--muted-light); }

/* Nav */
.nav { display: flex; align-items: center; gap: 4px; }
.nav__item { position: relative; }

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  font-size: 15px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.86);
  border-radius: 8px;
  transition: color 0.25s;
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 2px;
  height: 2px;
  background: var(--accent-soft);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease);
}
.nav__link:hover::after,
.nav__item.is-active .nav__link::after { transform: scaleX(1); }
.nav__link:hover { color: #fff; }

.site-header.is-solid .nav__link { color: var(--muted); }
.site-header.is-solid .nav__link:hover { color: var(--primary-700); }
.site-header.is-solid .nav__link::after { background: var(--accent); }

.nav__caret { width: 8px; height: 8px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: rotate(45deg) translateY(-2px); opacity: 0.6; }

/* Dropdown */
.nav__dropdown {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translate(-50%, 8px);
  min-width: 268px;
  padding: 10px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: 0 30px 60px -30px rgba(8, 32, 42, 0.45);
  border: 1px solid var(--line);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.28s, transform 0.28s var(--ease), visibility 0.28s;
}
.nav__item:hover .nav__dropdown { opacity: 1; visibility: visible; transform: translate(-50%, 0); }
.nav__dropdown a {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 14px;
  border-radius: 8px;
  font-size: 14.5px;
  color: var(--text);
  transition: background 0.2s, color 0.2s;
}
.nav__dropdown a span { color: var(--muted-light); font-size: 12px; letter-spacing: 0.06em; }
.nav__dropdown a:hover { background: var(--bg-soft); color: var(--accent-600); }

/* Header actions */
.header-actions { display: flex; align-items: center; gap: 14px; flex: none; }

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 42px;
  padding: 0 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.3);
  transition: background 0.3s, color 0.3s, border-color 0.3s;
}
.header-cta:hover { background: var(--accent); border-color: var(--accent); }
.site-header.is-solid .header-cta {
  color: #fff;
  background: var(--primary);
  border-color: var(--primary);
}
.site-header.is-solid .header-cta:hover { background: var(--accent); border-color: var(--accent); }

.burger {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 6px;
}
.burger span {
  display: block;
  width: 22px;
  height: 1.8px;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.35s var(--ease), opacity 0.25s, background 0.35s;
}
.site-header.is-solid .burger span { background: var(--primary-700); }

/* ---------- 6. Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 40px) 0 90px;
  background: var(--ink);
  overflow: hidden;
  color: #fff;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: url("../img/hero-plant.jpg") center 40% / cover no-repeat;
  transform: scale(1.06);
  animation: heroZoom 18s var(--ease) forwards;
}
@keyframes heroZoom { to { transform: scale(1); } }

.hero__veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to right, rgba(6, 26, 34, 0.94) 0%, rgba(6, 26, 34, 0.82) 38%, rgba(6, 26, 34, 0.28) 72%, rgba(6, 26, 34, 0.45) 100%),
    linear-gradient(to top, rgba(6, 26, 34, 0.96) 0%, rgba(6, 26, 34, 0) 55%);
}

/* 分子网格装饰 */
.hero__mesh {
  position: absolute;
  inset: 0;
  opacity: 0.5;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 78% 28%, rgba(0, 169, 143, 0.28), transparent 42%),
    radial-gradient(circle at 62% 82%, rgba(111, 227, 206, 0.16), transparent 46%);
}

.hero .container { position: relative; z-index: 2; }

.hero__inner { max-width: 720px; }

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-soft);
  margin-bottom: 26px;
  padding: 8px 16px 8px 12px;
  border: 1px solid rgba(111, 227, 206, 0.32);
  border-radius: 999px;
  background: rgba(111, 227, 206, 0.07);
}
.hero__eyebrow i {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent-soft);
  box-shadow: 0 0 0 4px rgba(111, 227, 206, 0.18);
  animation: pulse 2.6s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.hero h1 {
  font-size: clamp(36px, 5.4vw, 68px);
  line-height: 1.14;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 26px;
}
.hero h1 em {
  font-style: normal;
  color: var(--accent-soft);
  position: relative;
}

.hero__desc {
  font-size: clamp(15.5px, 1.4vw, 17.5px);
  line-height: 1.85;
  color: rgba(233, 242, 240, 0.76);
  max-width: 590px;
  margin-bottom: 38px;
}

.hero__actions { display: flex; flex-wrap: wrap; gap: 16px; }

/* Hero 统计条 */
.hero__stats {
  position: relative;
  z-index: 2;
  margin-top: 76px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius);
  overflow: hidden;
  backdrop-filter: blur(10px);
}
.hero__stat {
  background: rgba(8, 32, 42, 0.55);
  padding: 26px 28px;
}
.hero__stat b {
  display: block;
  font-size: clamp(26px, 2.8vw, 36px);
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
}
.hero__stat b i { font-style: normal; font-size: 0.55em; margin-left: 2px; color: var(--accent-soft); }
.hero__stat span {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: rgba(233, 242, 240, 0.6);
}

/* Scroll hint */
.hero__scroll {
  position: absolute;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
}
.hero__scroll::after {
  content: "";
  width: 1px;
  height: 42px;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.6), transparent);
  animation: scrollLine 2s infinite;
}
@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  100% { transform: scaleY(1); transform-origin: bottom; opacity: 0; }
}

/* ---------- 7. About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 76px;
  align-items: center;
}

.about-media { position: relative; }
.about-media__main {
  border-radius: var(--radius-l);
  overflow: hidden;
  box-shadow: var(--shadow-l);
  aspect-ratio: 4 / 3.4;
}
.about-media__main img { width: 100%; height: 100%; object-fit: cover; }

.about-media__card {
  position: absolute;
  right: -28px;
  bottom: -34px;
  width: 220px;
  padding: 24px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.about-media__card b {
  display: block;
  font-size: 34px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent-soft);
}
.about-media__card span {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.72);
}

.about-media__badge {
  position: absolute;
  top: 22px;
  left: 22px;
  padding: 7px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.9);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--primary);
  backdrop-filter: blur(6px);
}

.about-copy p {
  color: var(--muted);
  font-size: 16.5px;
  margin-bottom: 18px;
}
.about-copy p strong { color: var(--primary-700); font-weight: 600; }

.about-points {
  margin: 34px 0 36px;
  display: grid;
  gap: 18px;
}
.about-points li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  font-size: 15.5px;
  color: var(--text);
}
.about-points svg { flex: none; margin-top: 5px; }

/* ---------- 8. Product cards ---------- */
.p-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.p-card {
  position: relative;
  display: flex;
  flex-direction: column;
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--line);
  transition: transform 0.4s var(--ease), box-shadow 0.4s, border-color 0.4s;
}
.p-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: transparent;
}

.p-card__art {
  position: relative;
  height: 176px;
  overflow: hidden;
  background: linear-gradient(150deg, var(--primary) 0%, var(--primary-600) 100%);
}
.p-card__art::before {
  content: "";
  position: absolute;
  inset: -30% -10% auto auto;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(111, 227, 206, 0.5), transparent 65%);
  transition: transform 0.6s var(--ease);
}
.p-card:hover .p-card__art::before { transform: scale(1.25); }

.p-card__art::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='56' height='96' viewBox='0 0 56 96'><g fill='none' stroke='rgba(255,255,255,0.16)' stroke-width='1'><path d='M28 0l24 14v28L28 56 4 42V14z'/><path d='M28 48l24 14v28L28 104 4 90V62z'/><path d='M28 24l24 14M28 24L4 38'/></g></svg>");
  opacity: 0.55;
}

.p-card__num {
  position: absolute;
  left: 22px;
  bottom: 8px;
  font-size: 58px;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  color: rgba(255, 255, 255, 0.16);
  z-index: 1;
}
.p-card__tag {
  position: absolute;
  left: 22px;
  top: 22px;
  z-index: 2;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-soft);
}

.p-card__body { padding: 26px 24px 28px; display: flex; flex-direction: column; flex: 1; }
.p-card__body h3 {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--primary-700);
  margin-bottom: 6px;
}
.p-card__en {
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted-light);
  margin-bottom: 16px;
}
.p-card__list {
  display: grid;
  gap: 9px;
  margin-bottom: 22px;
  flex: 1;
}
.p-card__list li {
  position: relative;
  padding-left: 15px;
  font-size: 14px;
  color: var(--muted);
}
.p-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.55;
}
.p-card__more {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--primary);
  padding-top: 16px;
  border-top: 1px solid var(--line);
  transition: color 0.25s, gap 0.3s var(--ease);
}
.p-card:hover .p-card__more { color: var(--accent-600); gap: 12px; }

/* ---------- 9. Solutions (dark) ---------- */
.sol-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--line-dark);
}
.sol-item {
  padding: 40px 30px 8px 0;
  border-right: 1px solid var(--line-dark);
  position: relative;
}
.sol-item:last-child { border-right: 0; padding-right: 0; }
.sol-item::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-soft);
  transition: width 0.5s var(--ease);
}
.sol-item:hover::before { width: 64px; }
.sol-item__step {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--accent-soft);
  margin-bottom: 18px;
  display: block;
}
.sol-item h3 {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
}
.sol-item p { font-size: 14.5px; color: rgba(233, 242, 240, 0.62); line-height: 1.8; }

.sol-foot {
  margin-top: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding-top: 40px;
  border-top: 1px solid var(--line-dark);
  flex-wrap: wrap;
}
.sol-foot p { color: rgba(233, 242, 240, 0.7); font-size: 15px; max-width: 560px; }

/* ---------- 10. Capability / stats split ---------- */
.cap-grid {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 72px;
  align-items: center;
}
.cap-media {
  position: relative;
  border-radius: var(--radius-l);
  overflow: hidden;
  box-shadow: var(--shadow-l);
  aspect-ratio: 4 / 3.6;
}
.cap-media img { width: 100%; height: 100%; object-fit: cover; }
.cap-media__plate {
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  padding: 26px 28px;
  background: linear-gradient(to top, rgba(8, 32, 42, 0.92), rgba(8, 32, 42, 0.05));
  color: #fff;
}
.cap-media__plate b { font-size: 15px; display: block; }
.cap-media__plate span { font-size: 13px; color: rgba(255, 255, 255, 0.66); }

.cap-list { display: grid; gap: 0; margin-top: 40px; }
.cap-list li {
  display: grid;
  grid-template-columns: 116px 1fr;
  gap: 24px;
  align-items: baseline;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}
.cap-list li:last-child { border-bottom: 1px solid var(--line); }
.cap-list b {
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--primary);
  line-height: 1;
}
.cap-list b i { font-style: normal; font-size: 0.5em; color: var(--accent); margin-left: 2px; }
.cap-list h4 { font-size: 16px; font-weight: 600; margin-bottom: 4px; color: var(--text); }
.cap-list p { font-size: 14px; color: var(--muted); }

/* ---------- 11. Certifications marquee ---------- */
.cert-strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #fff;
  overflow: hidden;
  padding: 26px 0;
}
.cert-track {
  display: flex;
  gap: 64px;
  width: max-content;
  animation: marquee 38s linear infinite;
}
.cert-strip:hover .cert-track { animation-play-state: paused; }
@keyframes marquee { to { transform: translateX(-50%); } }
.cert-track span {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}
.cert-track span::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.6;
}

/* ---------- 12. Sustainability ---------- */
.sus-wrap {
  position: relative;
  border-radius: var(--radius-l);
  overflow: hidden;
  min-height: 480px;
  display: flex;
  align-items: flex-end;
  background: var(--ink);
}
.sus-wrap img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.sus-wrap::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, rgba(8, 32, 42, 0.92) 0%, rgba(8, 32, 42, 0.72) 44%, rgba(8, 32, 42, 0.12) 100%);
}
.sus-body {
  position: relative;
  z-index: 2;
  padding: 64px;
  max-width: 620px;
  color: #fff;
}
.sus-body .eyebrow { color: var(--accent-soft); }
.sus-body h2 {
  font-size: clamp(26px, 3vw, 38px);
  line-height: 1.3;
  letter-spacing: -0.015em;
  margin-bottom: 18px;
}
.sus-body p { color: rgba(233, 242, 240, 0.72); font-size: 16px; margin-bottom: 32px; }
.sus-metrics { display: flex; gap: 46px; flex-wrap: wrap; }
.sus-metrics b {
  display: block;
  font-size: 30px;
  line-height: 1;
  color: var(--accent-soft);
  letter-spacing: -0.02em;
}
.sus-metrics span { font-size: 12.5px; color: rgba(255, 255, 255, 0.62); margin-top: 8px; display: block; }

/* ---------- 13. News ---------- */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }

.news-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.4s var(--ease), box-shadow 0.4s, border-color 0.4s;
}
.news-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }

.news-card__top {
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-soft));
  opacity: 0;
  transition: opacity 0.4s;
}
.news-card:hover .news-card__top { opacity: 1; }

.news-card__body { padding: 30px 28px 28px; display: flex; flex-direction: column; flex: 1; }
.news-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--muted-light);
  margin-bottom: 18px;
}
.news-meta i {
  font-style: normal;
  padding: 3px 9px;
  border-radius: 4px;
  background: var(--bg-mist);
  color: var(--accent-600);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.news-card h3 {
  font-size: 18px;
  line-height: 1.5;
  font-weight: 600;
  color: var(--primary-700);
  margin-bottom: 14px;
  transition: color 0.3s;
}
.news-card:hover h3 { color: var(--accent-600); }
.news-card p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 22px;
  flex: 1;
}
.news-card__link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--primary);
  transition: gap 0.3s var(--ease), color 0.3s;
}
.news-card:hover .news-card__link { gap: 12px; color: var(--accent-600); }

/* ---------- 14. CTA band ---------- */
.cta-band {
  position: relative;
  overflow: hidden;
  background: var(--primary-700);
  color: #fff;
  padding: 88px 0;
}
.cta-band::before {
  content: "";
  position: absolute;
  right: -6%;
  top: -60%;
  width: 620px;
  height: 620px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 169, 143, 0.34), transparent 62%);
}
.cta-band::after {
  content: "";
  position: absolute;
  left: 8%;
  bottom: -70%;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(111, 227, 206, 0.16), transparent 65%);
}
.cta-inner {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
  flex-wrap: wrap;
}
.cta-inner h2 {
  font-size: clamp(26px, 3.2vw, 40px);
  line-height: 1.3;
  letter-spacing: -0.015em;
  margin-bottom: 14px;
}
.cta-inner p { color: rgba(233, 242, 240, 0.7); font-size: 16px; max-width: 520px; }
.cta-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- 15. Footer ---------- */
.site-footer {
  background: var(--ink);
  color: rgba(233, 242, 240, 0.7);
  padding: 76px 0 0;
  font-size: 14.5px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.3fr;
  gap: 56px;
  padding-bottom: 56px;
}
.footer-brand .logo { margin-bottom: 22px; }
.footer-brand .logo__cn { color: #fff; }
.footer-brand .logo__en { color: rgba(255, 255, 255, 0.5); }
.footer-brand p { color: rgba(233, 242, 240, 0.55); font-size: 14px; line-height: 1.85; max-width: 320px; }

.footer-social { display: flex; gap: 10px; margin-top: 24px; }
.footer-social a {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--line-dark);
  display: grid;
  place-items: center;
  color: rgba(233, 242, 240, 0.7);
  transition: background 0.3s, color 0.3s, border-color 0.3s, transform 0.3s;
}
.footer-social a:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  transform: translateY(-3px);
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #fff;
  margin-bottom: 22px;
}
.footer-col ul { display: grid; gap: 13px; }
.footer-col a { transition: color 0.25s, padding-left 0.25s; }
.footer-col a:hover { color: var(--accent-soft); padding-left: 4px; }

.footer-contact li {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  line-height: 1.7;
}
.footer-contact svg { flex: none; margin-top: 4px; color: var(--accent); }

.footer-bottom {
  border-top: 1px solid var(--line-dark);
  padding: 24px 0 28px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 13px;
  color: rgba(233, 242, 240, 0.42);
}
.footer-bottom a:hover { color: var(--accent-soft); }
.footer-bottom nav { display: flex; gap: 24px; }

/* ---------- 16. Page hero (sub pages) ---------- */
.page-hero {
  position: relative;
  padding: calc(var(--header-h) + 92px) 0 82px;
  background: var(--primary-700);
  color: #fff;
  overflow: hidden;
}
.page-hero__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.28;
}
.page-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(8, 32, 42, 0.94) 0%, rgba(8, 32, 42, 0.55) 55%, rgba(8, 32, 42, 0.35) 100%);
}
.page-hero .container { position: relative; z-index: 2; }
.page-hero h1 {
  font-size: clamp(30px, 4.2vw, 52px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  font-weight: 700;
  margin-bottom: 18px;
  max-width: 760px;
}
.page-hero p {
  max-width: 620px;
  color: rgba(233, 242, 240, 0.68);
  font-size: 16.5px;
}
.crumbs {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: rgba(233, 242, 240, 0.5);
  margin-bottom: 26px;
  letter-spacing: 0.04em;
}
.crumbs a:hover { color: var(--accent-soft); }
.crumbs i { font-style: normal; opacity: 0.5; }

/* ---------- 17. Generic content pieces ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
  align-items: center;
}
.split--rev .split__media { order: 2; }

.split__media {
  border-radius: var(--radius-l);
  overflow: hidden;
  box-shadow: var(--shadow);
  aspect-ratio: 4 / 3.2;
}
.split__media img { width: 100%; height: 100%; object-fit: cover; }

.body-copy p { color: var(--muted); font-size: 16px; margin-bottom: 16px; }
.body-copy p:last-child { margin-bottom: 0; }

.bullet-list { display: grid; gap: 14px; margin-top: 26px; }
.bullet-list li {
  display: flex;
  gap: 12px;
  font-size: 15px;
  color: var(--text);
  align-items: flex-start;
}
.bullet-list svg { flex: none; margin-top: 6px; }

.stat-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 18px;
}
.stat-cell {
  padding: 32px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  transition: box-shadow 0.35s, transform 0.35s var(--ease), border-color 0.35s;
}
.stat-cell:hover { box-shadow: var(--shadow); transform: translateY(-4px); border-color: transparent; }
.stat-cell b {
  display: block;
  font-size: 34px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--primary);
}
.stat-cell b i { font-style: normal; font-size: 0.5em; color: var(--accent); margin-left: 2px; }
.stat-cell span { display: block; margin-top: 12px; font-size: 13.5px; color: var(--muted); }

/* Timeline */
.timeline { position: relative; margin-top: 8px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 148px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--line);
}
.tl-item {
  display: grid;
  grid-template-columns: 148px 1fr;
  gap: 44px;
  padding: 26px 0;
  position: relative;
}
.tl-item::before {
  content: "";
  position: absolute;
  left: 142px;
  top: 36px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--accent);
  z-index: 2;
}
.tl-year {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.01em;
}
.tl-item h4 { font-size: 17px; font-weight: 600; margin-bottom: 8px; color: var(--text); }
.tl-item p { font-size: 14.5px; color: var(--muted); }

/* Product detail rows */
.prod-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
  align-items: stretch;
}
.prod-row:nth-child(even) .prod-row__media { order: 2; }
.prod-row__media {
  position: relative;
  min-height: 340px;
  overflow: hidden;
  background: linear-gradient(150deg, var(--primary) 0%, var(--primary-600) 100%);
}
.prod-row__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='56' height='96' viewBox='0 0 56 96'><g fill='none' stroke='rgba(255,255,255,0.13)' stroke-width='1'><path d='M28 0l24 14v28L28 56 4 42V14z'/><path d='M28 48l24 14v28L28 104 4 90V62z'/></g></svg>");
}
.prod-row__media b {
  position: absolute;
  left: 40px;
  bottom: 26px;
  z-index: 2;
  font-size: 84px;
  font-weight: 800;
  line-height: 1;
  color: rgba(255, 255, 255, 0.14);
  letter-spacing: -0.04em;
}
.prod-row__body {
  padding: 56px 48px;
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.prod-row__body h3 {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-700);
  margin-bottom: 6px;
}
.prod-row__body .en {
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted-light);
  margin-bottom: 18px;
  display: block;
}
.prod-row__body p { color: var(--muted); font-size: 15px; margin-bottom: 20px; }
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-size: 12.5px;
  padding: 6px 13px;
  border-radius: 999px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  color: var(--primary);
}

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 72px; }
.contact-list { display: grid; gap: 0; margin-top: 10px; }
.contact-list li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 18px;
  padding: 26px 0;
  border-top: 1px solid var(--line);
}
.contact-list li:last-child { border-bottom: 1px solid var(--line); }
.contact-ico {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: var(--bg-mist);
  color: var(--accent-600);
}
.contact-list h4 { font-size: 14px; font-weight: 600; color: var(--muted-light); letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 6px; }
.contact-list p, .contact-list a { font-size: 16px; color: var(--text); }
.contact-list a:hover { color: var(--accent-600); }

.form-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  padding: 44px;
  box-shadow: var(--shadow-s);
}
.form-card h3 { font-size: 22px; font-weight: 700; color: var(--primary-700); margin-bottom: 8px; }
.form-card > p { font-size: 14px; color: var(--muted); margin-bottom: 28px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field--full { grid-column: 1 / -1; }
.field label { font-size: 13px; font-weight: 600; color: var(--muted); letter-spacing: 0.03em; }
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  font-size: 14.5px;
  color: var(--text);
  background: #fbfdfc;
  transition: border-color 0.25s, box-shadow 0.25s, background 0.25s;
}
.field textarea { resize: vertical; min-height: 108px; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(0, 169, 143, 0.12);
}
.form-note { font-size: 12.5px; color: var(--muted-light); margin-top: 16px; line-height: 1.7; }

.form-ok {
  display: none;
  margin-top: 18px;
  padding: 14px 18px;
  border-radius: 8px;
  background: rgba(0, 169, 143, 0.1);
  color: var(--accent-600);
  font-size: 14px;
  font-weight: 500;
}
.form-ok.is-show { display: block; }

/* Map placeholder */
.map-wrap {
  position: relative;
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--bg-mist);
  min-height: 320px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
}
.map-wrap svg { width: 100%; height: 100%; display: block; }

/* ---------- 18. Reveal animations ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}
[data-reveal].is-in { opacity: 1; transform: none; }
[data-reveal][data-delay="1"] { transition-delay: 0.09s; }
[data-reveal][data-delay="2"] { transition-delay: 0.18s; }
[data-reveal][data-delay="3"] { transition-delay: 0.27s; }
[data-reveal][data-delay="4"] { transition-delay: 0.36s; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
  [data-reveal] { opacity: 1; transform: none; }
}

/* ---------- 19. Responsive ---------- */
@media (max-width: 1180px) {
  .p-grid { grid-template-columns: repeat(2, 1fr); }
  .sol-grid { grid-template-columns: repeat(2, 1fr); }
  .sol-item { padding: 34px 28px 8px 0; }
  .sol-item:nth-child(2) { border-right: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 44px; }
}

@media (max-width: 1024px) {
  :root { --header-h: 72px; }
  .section { padding: 84px 0; }
  .nav, .header-cta { display: none; }
  .burger { display: flex; }

  .site-header { height: 72px; }
  .logo__cn { font-size: 19px; }

  .about-grid, .cap-grid, .split, .contact-grid {
    grid-template-columns: 1fr;
    gap: 52px;
  }
  .split--rev .split__media { order: 0; }
  .about-media { max-width: 560px; }
  .about-media__card { right: 0; bottom: -24px; }

  .news-grid { grid-template-columns: 1fr; }
  .hero__stats { grid-template-columns: repeat(2, 1fr); }
  .stat-row { grid-template-columns: repeat(2, 1fr); }
  .section-head { flex-direction: column; align-items: flex-start; gap: 24px; }

  .sus-body { padding: 44px 34px; }
  .prod-row, .prod-row:nth-child(even) { grid-template-columns: 1fr; }
  .prod-row:nth-child(even) .prod-row__media { order: 0; }
  .prod-row__media { min-height: 220px; }
  .prod-row__body { padding: 36px 28px; }

  .form-grid { grid-template-columns: 1fr; }
  .form-card { padding: 32px 24px; }
}

/* Mobile drawer */
.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: 89;
  background: #06202a;
  padding: 100px 28px 40px;
  transform: translateX(100%);
  transition: transform 0.45s var(--ease);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.mobile-nav.is-open { transform: none; }
.mobile-nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  font-size: 19px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid rgba(255, 255, 255, 0.09);
}
.mobile-nav a span { font-size: 12px; color: rgba(255, 255, 255, 0.35); letter-spacing: 0.1em; }
.mobile-nav .btn { margin-top: 32px; width: 100%; }

@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .section { padding: 68px 0; }
  .hero { min-height: auto; padding: calc(var(--header-h) + 56px) 0 64px; }
  .hero__bg { background-position: 62% center; }
  .hero h1 { font-size: clamp(30px, 8vw, 40px); }
  .hero__stats { margin-top: 48px; }
  .hero__stat { padding: 20px; }
  .hero__scroll { display: none; }
  .p-grid, .sol-grid { grid-template-columns: 1fr; }
  .sol-item { border-right: 0; border-bottom: 1px solid var(--line-dark); padding: 30px 0 24px; }
  .sol-item:last-child { border-bottom: 0; }
  .stat-row { grid-template-columns: 1fr 1fr; gap: 14px; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; padding-bottom: 40px; }
  .cta-inner { flex-direction: column; align-items: flex-start; }
  .sus-metrics { gap: 30px; }
  .timeline::before { left: 6px; }
  .tl-item { grid-template-columns: 1fr; gap: 8px; padding-left: 34px; }
  .tl-item::before { left: 0; top: 32px; }
  .cap-list li { grid-template-columns: 84px 1fr; gap: 16px; }
  .cap-list b { font-size: 24px; }
  .page-hero { padding: calc(var(--header-h) + 56px) 0 56px; }
}

/* ---------- 20. 合作模式卡片 / FAQ ---------- */
.mode-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.mode-card {
  position: relative;
  padding: 36px 32px 34px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform 0.4s var(--ease), box-shadow 0.4s, border-color 0.4s;
  overflow: hidden;
}
.mode-card::after {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-soft));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s var(--ease);
}
.mode-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }
.mode-card:hover::after { transform: scaleX(1); }
.mode-card__n {
  display: block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--accent-600);
  margin-bottom: 20px;
}
.mode-card h3 { font-size: 20px; font-weight: 700; color: var(--primary-700); margin-bottom: 12px; }
.mode-card > p { font-size: 14.5px; color: var(--muted); line-height: 1.8; margin-bottom: 20px; }
.mode-card ul { display: grid; gap: 10px; }
.mode-card li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  color: var(--text);
}
.mode-card li::before {
  content: "";
  position: absolute;
  left: 0; top: 9px;
  width: 6px; height: 1px;
  background: var(--accent);
}

.faq-list { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); padding: 26px 0; }
.faq-item h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--primary-700);
  display: flex;
  gap: 16px;
  align-items: baseline;
}
.faq-item h3 i {
  font-style: normal;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--accent-600);
  flex: none;
}
.faq-item p { margin-top: 10px; padding-left: 42px; font-size: 14.5px; color: var(--muted); }

@media (max-width: 1024px) {
  .mode-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero__stats { grid-template-columns: 1fr; }
  .stat-row { grid-template-columns: 1fr; }
  .about-media__card { position: static; width: 100%; margin-top: 14px; }
  .about-media__card b { font-size: 28px; }
  .sus-body { padding: 34px 22px; }
  .btn { width: 100%; }
  .hero__actions, .cta-actions { width: 100%; }
}