:root {
  --ink: #111111;
  --text: #30332f;
  --muted: #686d66;
  --line: #d6d8d3;
  --paper: #f7f7f5;
  --white: #ffffff;
  --olive: #6f7c68;
  --sage: #9db4a2;
  --gold: #c69c59;
  --charcoal: #1f1f1f;
  --radius: 10px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family:
    Arial,
    "PingFang SC",
    "Hiragino Sans GB",
    "Microsoft YaHei",
    sans-serif;
  background: var(--paper);
  color: var(--text);
  letter-spacing: 0;
}

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

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(18px, 4vw, 54px);
  background: color-mix(in srgb, var(--paper) 92%, white);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: min(360px, 42vw);
}

.brand-logo {
  width: 44px;
  height: 44px;
  object-fit: cover;
  border-radius: 8px;
  filter: grayscale(1) contrast(1.12);
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.1;
}

.brand strong {
  font-size: clamp(14px, 1.35vw, 17px);
  color: var(--ink);
  white-space: nowrap;
}

.brand small {
  margin-top: 4px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(14px, 2.8vw, 34px);
  color: var(--muted);
  font-size: 14px;
}

.nav a {
  transition: color 180ms ease;
}

.nav a:hover {
  color: var(--ink);
}

.lang-toggle {
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  padding: 10px 14px;
  font: inherit;
  white-space: nowrap;
}

.hero,
.section,
.positioning,
.image-band,
.platform-detail,
.proof,
.footer {
  width: min(var(--max), calc(100% - 36px));
  margin-inline: auto;
}

.hero {
  position: relative;
  min-height: calc(100dvh - 82px);
  display: flex;
  align-items: center;
  width: 100%;
  max-width: none;
  overflow: hidden;
  padding: clamp(54px, 8vw, 112px) clamp(22px, 5vw, 70px) 62px;
}

.hero-copy {
  position: relative;
  z-index: 5;
  width: min(760px, 58vw);
  margin-left: max(18px, calc((100vw - var(--max)) / 2));
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  background: #f2f2ef;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center right;
  opacity: 0.88;
  filter: grayscale(1) contrast(1.02) brightness(1.08);
  transform: scale(1.035);
}

.hero-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(90deg, rgb(247 247 245 / 0.96) 0%, rgb(247 247 245 / 0.82) 34%, rgb(247 247 245 / 0.28) 62%, rgb(247 247 245 / 0.1) 100%),
    radial-gradient(circle at 77% 42%, rgb(255 255 255 / 0.18), transparent 28%);
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  z-index: 2;
  height: 42%;
  background: linear-gradient(180deg, transparent, rgb(247 247 245 / 0.48));
}

.kicker {
  margin: 0 0 18px;
  color: var(--olive);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.hero h1,
.section h2,
.proof h2,
.footer h2 {
  margin: 0;
  color: var(--ink);
  font-weight: 800;
  letter-spacing: 0;
  text-wrap: balance;
}

.hero h1 {
  max-width: 760px;
  font-size: clamp(42px, 6.8vw, 82px);
  line-height: 1.02;
}

.platform-stack {
  display: grid;
  gap: 10px;
}

.platform-stack span {
  display: block;
  width: max-content;
  max-width: 100%;
  padding: 0 0 12px;
  border-bottom: 1px solid var(--line);
  font-size: clamp(28px, 4vw, 56px);
  line-height: 1.08;
  white-space: nowrap;
}

.platform-stack span:nth-child(4) {
  color: var(--ink);
  border-bottom-color: var(--gold);
}

.hero-lede {
  max-width: 680px;
  margin: 28px 0 0;
  color: var(--text);
  font-size: clamp(17px, 2vw, 22px);
  line-height: 1.65;
  text-wrap: pretty;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  border-radius: 999px;
  padding: 12px 20px;
  font-weight: 700;
}

.button.primary {
  background: var(--ink);
  color: var(--white);
}

.button.secondary {
  border: 1px solid var(--ink);
  color: var(--ink);
}

html[lang="en"] .platform-stack span {
  width: 100%;
  font-size: clamp(28px, 2.7vw, 46px);
  line-height: 1.08;
  white-space: normal;
}

html[lang="en"] .hero-copy {
  width: min(720px, 49vw);
}

.positioning {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: clamp(34px, 6vw, 72px) 0;
}

.positioning p {
  max-width: 920px;
  margin: 0;
  color: var(--ink);
  font-size: clamp(24px, 4.5vw, 50px);
  font-weight: 750;
  line-height: 1.18;
  text-wrap: balance;
}

.section {
  padding: clamp(58px, 8vw, 110px) 0;
}

.split {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: clamp(30px, 6vw, 80px);
}

.section-heading h2,
.proof h2,
.footer h2 {
  font-size: clamp(32px, 5vw, 62px);
  line-height: 1.05;
}

.section-heading.compact {
  max-width: 820px;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.platform-card {
  min-height: 260px;
  padding: clamp(22px, 3vw, 34px);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.platform-card.highlighted {
  background: #eceee9;
}

.index {
  display: inline-block;
  margin-bottom: 42px;
  color: var(--gold);
  font-weight: 900;
}

.platform-card h3,
.product-item h3 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(21px, 2.4vw, 30px);
  line-height: 1.16;
}

.platform-card p,
.product-item p,
.image-band p,
.about-body p,
.proof span {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.72;
}

.image-band {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  align-items: center;
  gap: clamp(26px, 5vw, 72px);
  padding: clamp(42px, 6vw, 72px);
  background: var(--charcoal);
  color: var(--white);
}

.image-band img {
  border-radius: 8px;
  background: var(--white);
}

.image-band h2 {
  margin: 0;
  color: var(--white);
  font-size: clamp(30px, 5vw, 60px);
  line-height: 1.08;
}

.image-band p:not(.kicker) {
  color: #d6d8d3;
}

.platform-detail {
  display: grid;
  grid-template-columns: 96px minmax(0, 0.95fr) minmax(300px, 1.05fr);
  gap: clamp(24px, 5vw, 62px);
  align-items: stretch;
  padding: clamp(44px, 7vw, 86px) 0;
  border-bottom: 1px solid var(--line);
}

.plant-platform {
  border-top: 1px solid var(--line);
  background:
    linear-gradient(90deg, transparent 0 60%, rgb(111 124 104 / 0.11) 60% 100%);
}

.detail-index {
  color: var(--gold);
  font-size: clamp(42px, 8vw, 96px);
  font-weight: 900;
  line-height: 0.9;
}

.platform-detail h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(34px, 5.5vw, 68px);
  line-height: 1.04;
  text-wrap: balance;
}

.platform-detail p:not(.kicker) {
  margin: 22px 0 0;
  color: var(--text);
  font-size: clamp(17px, 2vw, 22px);
  line-height: 1.68;
}

.detail-points {
  display: grid;
  align-content: stretch;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.detail-points span {
  display: flex;
  align-items: center;
  min-height: 116px;
  padding: 22px 24px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--white);
  color: var(--text);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
}

.product-points .point-title {
  min-height: 72px;
  background: var(--charcoal);
  color: var(--white);
  font-size: 20px;
}

.product-points span:not(.point-title) {
  min-height: 74px;
  color: var(--ink);
  font-size: 19px;
}

.oil-platform {
  background:
    linear-gradient(90deg, transparent 0 60%, rgb(198 156 89 / 0.09) 60% 100%);
}

.glucan-platform {
  background:
    linear-gradient(90deg, transparent 0 60%, rgb(157 180 162 / 0.14) 60% 100%);
}

.synthesis-platform {
  background:
    linear-gradient(90deg, transparent 0 60%, rgb(111 124 104 / 0.12) 60% 100%);
}

.product-list {
  display: grid;
  gap: 18px;
  margin-top: 34px;
}

.product-item {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: clamp(22px, 4vw, 46px);
  align-items: center;
  padding: clamp(18px, 3vw, 32px);
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: var(--radius);
}

.product-item img,
.formula-mark {
  width: 100%;
  aspect-ratio: 1.15;
  object-fit: cover;
  border-radius: 8px;
}

.formula-mark {
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgb(111 124 104 / 0.18), transparent 55%),
    #f2f3ef;
  color: var(--ink);
  font-size: clamp(44px, 7vw, 76px);
  font-weight: 900;
}

.formula-mark.botanical {
  background:
    linear-gradient(135deg, rgb(111 124 104 / 0.22), transparent 55%),
    #edf0ea;
}

.formula-mark.repair {
  background:
    linear-gradient(135deg, rgb(157 180 162 / 0.5), transparent 58%),
    #f3f5f1;
  font-size: clamp(38px, 6vw, 68px);
}

.formula-mark.shield {
  background:
    linear-gradient(135deg, rgb(198 156 89 / 0.36), transparent 60%),
    #f5f1e7;
}

.hero-product {
  border-color: color-mix(in srgb, var(--olive) 45%, var(--line));
}

.product-item ul {
  display: grid;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.product-item li {
  position: relative;
  padding-left: 18px;
  color: var(--text);
  line-height: 1.55;
}

.product-item li::before {
  content: "";
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold);
}

.proof {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(28px, 6vw, 80px);
  padding: clamp(52px, 7vw, 92px) 0;
  border-top: 1px solid var(--line);
}

.proof-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.proof-grid div {
  padding: 24px;
  background: var(--paper);
}

.proof strong,
.proof span {
  display: block;
}

.proof strong {
  margin-bottom: 8px;
  color: var(--ink);
  font-size: 20px;
}

.about {
  border-top: 1px solid var(--line);
}

.about-body {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  gap: clamp(28px, 6vw, 76px);
  align-items: end;
  margin-top: 30px;
}

.about-body p {
  max-width: 620px;
  color: var(--text);
  font-size: clamp(18px, 2vw, 22px);
}

.about-body img {
  border-radius: var(--radius);
}

.footer {
  position: relative;
  display: grid;
  grid-template-columns: minmax(280px, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(28px, 6vw, 80px);
  padding: clamp(52px, 7vw, 86px) 0;
  border-top: 1px solid var(--ink);
}

.footer::before {
  content: "SUNWIN";
  position: absolute;
  right: 0;
  top: 28px;
  z-index: -1;
  color: rgb(17 17 17 / 0.035);
  font-size: clamp(86px, 18vw, 220px);
  font-weight: 900;
  line-height: 1;
}

.contact-grid {
  display: grid;
  gap: 16px;
}

.contact-note {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--charcoal);
}

.contact-note span {
  min-height: 82px;
  display: flex;
  align-items: center;
  padding: 18px;
  border-right: 1px solid rgb(255 255 255 / 0.16);
  color: var(--white);
  font-weight: 800;
  line-height: 1.35;
}

.contact-note span:last-child {
  border-right: 0;
  color: var(--gold);
}

.contact-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.contact-card h3 {
  margin: 0;
  color: var(--ink);
  font-size: 26px;
}

.contact-card p {
  margin: 7px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.contact-card a {
  align-self: start;
  border: 1px solid var(--ink);
  border-radius: 999px;
  padding: 10px 14px;
  color: var(--ink);
  font-weight: 700;
  white-space: nowrap;
}

@media (max-width: 920px) {
  .site-header {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .nav {
    order: 3;
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .hero,
  .split,
  .image-band,
  .platform-detail,
  .proof,
  .about-body,
  .footer {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-inline: 24px;
  }

  .hero-copy {
    width: min(760px, 72vw);
    margin-left: 0;
  }

  html[lang="en"] .hero-copy {
    width: min(680px, 66vw);
  }

  .platform-grid {
    grid-template-columns: 1fr;
  }

  .product-item {
    grid-template-columns: 1fr;
  }

  .product-item img,
  .formula-mark {
    max-height: 300px;
  }
}

@media (max-width: 560px) {
  .brand {
    min-width: 0;
  }

  .brand small {
    display: none;
  }

  .hero,
  .section,
  .positioning,
  .image-band,
  .proof,
  .footer {
    width: min(100% - 24px, var(--max));
  }

  .hero h1 {
    font-size: clamp(34px, 11vw, 52px);
  }

  .hero {
    width: 100%;
    min-height: 680px;
    padding-inline: 18px;
  }

  .hero-copy {
    width: 100%;
  }

  .platform-stack span {
    width: 100%;
    font-size: clamp(26px, 9vw, 42px);
    white-space: normal;
  }

  .hero-bg img {
    object-position: 64% center;
  }

  .hero-bg::before {
    background:
      linear-gradient(90deg, rgb(247 247 245 / 0.94) 0%, rgb(247 247 245 / 0.84) 54%, rgb(247 247 245 / 0.38) 100%),
      radial-gradient(circle at 72% 42%, rgb(255 255 255 / 0.18), transparent 32%);
  }

  .image-band {
    padding: 24px;
  }

  .platform-detail {
    padding-block: 40px;
  }

  .detail-index {
    font-size: 54px;
  }

  .contact-card {
    grid-template-columns: 1fr;
  }

  .contact-note {
    grid-template-columns: 1fr 1fr;
  }
}

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