:root {
  color-scheme: light;
  --ink: #0d2f3d;
  --ink-soft: #42616a;
  --paper: #f7fbfa;
  --white: #ffffff;
  --mist: #e8f5f2;
  --line: rgba(13, 47, 61, 0.14);
  --teal: #18a99f;
  --teal-dark: #0d766f;
  --copper: #bd7b48;
  --shadow: 0 24px 80px rgba(10, 43, 55, 0.16);
  --header-height: 76px;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-size: 16px;
  line-height: 1.65;
}

body.menu-open {
  overflow: hidden;
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.site-header {
  position: fixed;
  z-index: 30;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 clamp(20px, 5vw, 72px);
  color: var(--white);
  transition: background 220ms ease, box-shadow 220ms ease, color 220ms ease;
}

.site-header.is-scrolled,
.site-header.menu-active {
  color: var(--ink);
  background: rgba(247, 251, 250, 0.92);
  box-shadow: 0 10px 40px rgba(15, 51, 68, 0.1);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  font-weight: 700;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 50%;
  color: var(--white);
  background: linear-gradient(135deg, var(--teal), var(--teal-dark));
  box-shadow: 0 10px 24px rgba(24, 169, 159, 0.28);
}

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

.brand small {
  margin-top: 4px;
  color: currentColor;
  font-size: 11px;
  font-weight: 500;
  opacity: 0.72;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 34px);
  font-size: 14px;
  font-weight: 650;
}

.site-nav a {
  position: relative;
  padding: 8px 0;
  opacity: 0.82;
  transition: color 180ms ease, opacity 180ms ease;
}

.site-nav a::after {
  position: absolute;
  left: 0;
  bottom: 2px;
  width: 100%;
  height: 2px;
  content: "";
  background: var(--teal);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}

.site-nav a:hover,
.site-nav a.is-active {
  opacity: 1;
}

.site-nav a.is-active::after {
  transform: scaleX(1);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  color: currentColor;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  margin: 5px auto;
  background: currentColor;
  transition: transform 180ms ease, opacity 180ms ease;
}

.menu-active .menu-toggle span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-active .menu-toggle span:nth-child(2) {
  opacity: 0;
}

.menu-active .menu-toggle span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.section-anchor {
  scroll-margin-top: calc(var(--header-height) + 16px);
}

.hero {
  position: relative;
  min-height: 82svh;
  display: grid;
  align-items: center;
  overflow: hidden;
  padding: calc(var(--header-height) + 58px) clamp(20px, 6vw, 92px) 76px;
  color: var(--white);
  isolation: isolate;
}

.hero::before {
  position: absolute;
  inset: 0;
  z-index: -3;
  content: "";
  background-image: url("assets/hero-laundry.png");
  background-size: cover;
  background-position: center;
  transform: scale(1.02);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(90deg, rgba(6, 31, 43, 0.88) 0%, rgba(9, 45, 59, 0.72) 38%, rgba(9, 45, 59, 0.18) 72%),
    linear-gradient(0deg, rgba(4, 26, 34, 0.34), rgba(4, 26, 34, 0.05));
}

.hero-content {
  width: min(680px, 100%);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--teal);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0;
}

.hero .eyebrow {
  color: #7ff1e7;
}

.hero-title {
  margin: 0;
  font-size: clamp(58px, 11vw, 132px);
  line-height: 0.92;
  letter-spacing: 0;
}

.hero-lead {
  max-width: 620px;
  margin: 30px 0 0;
  color: rgba(255, 255, 255, 0.9);
  font-size: clamp(21px, 3vw, 34px);
  line-height: 1.35;
  font-weight: 700;
}

.hero-meta {
  margin: 22px 0 0;
  color: rgba(255, 255, 255, 0.75);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  padding: 0 22px;
  font-weight: 800;
  transition: transform 180ms ease, background 180ms ease, color 180ms ease, border-color 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

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

.button-secondary {
  border: 1px solid rgba(255, 255, 255, 0.45);
  color: var(--white);
}

.button-secondary:hover {
  border-color: var(--white);
  background: rgba(255, 255, 255, 0.1);
}

.section-inner {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.intro,
.strengths,
.process,
.services,
.sustainability,
.contact {
  padding: clamp(76px, 10vw, 132px) 0;
}

.intro {
  background: var(--white);
}

.intro-layout,
.service-layout,
.sustainability-layout,
.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: clamp(34px, 7vw, 92px);
  align-items: start;
}

.section-heading h2 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(34px, 5vw, 64px);
  line-height: 1.08;
  letter-spacing: 0;
}

.intro-copy,
.service-copy,
.sustainability-layout > p,
.contact-panel > p {
  margin: 0;
  color: var(--ink-soft);
  font-size: clamp(17px, 2vw, 20px);
}

.strengths {
  background: linear-gradient(180deg, var(--paper), #edf7f4);
}

.strength-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(44px, 6vw, 72px);
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.strength-item {
  min-height: 286px;
  padding: clamp(28px, 4vw, 46px);
  background: rgba(247, 251, 250, 0.76);
}

.item-number {
  color: var(--copper);
  font-size: 13px;
  font-weight: 900;
}

.strength-item h3 {
  margin: 18px 0 16px;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.2;
}

.strength-item p {
  margin: 0;
  color: var(--ink-soft);
}

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

.process .section-heading h2,
.process .eyebrow {
  color: var(--white);
}

.process .eyebrow {
  opacity: 0.82;
}

.process-line {
  display: grid;
  grid-template-columns: repeat(6, minmax(136px, 1fr));
  gap: 0;
  margin-top: clamp(44px, 6vw, 72px);
  overflow-x: auto;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}

.process-step {
  min-width: 136px;
  padding: 30px 24px 34px;
  border-right: 1px solid rgba(255, 255, 255, 0.18);
}

.process-step:last-child {
  border-right: 0;
}

.process-step span {
  display: block;
  color: #7ff1e7;
  font-size: 23px;
  font-weight: 900;
}

.process-step p {
  margin: 12px 0 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
}

.delivery-band {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: 34px;
  padding: 26px 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.delivery-band strong {
  color: #7ff1e7;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.2;
}

.delivery-band span {
  max-width: 580px;
  color: rgba(255, 255, 255, 0.74);
}

.services {
  background: var(--white);
}

.service-list {
  display: grid;
  gap: 14px;
}

.service-list span {
  display: block;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 900;
  line-height: 1.15;
}

.service-copy {
  grid-column: 2;
}

.sustainability {
  background:
    radial-gradient(circle at 12% 15%, rgba(24, 169, 159, 0.12), transparent 28%),
    linear-gradient(135deg, #eef8f5, #fbf8f1);
}

.sustainability-layout {
  align-items: center;
}

.sustainability-layout > p {
  padding-left: clamp(0px, 3vw, 42px);
  border-left: 4px solid var(--teal);
}

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

.contact .eyebrow,
.contact .section-heading h2 {
  color: var(--white);
}

.contact-panel {
  padding: clamp(28px, 4vw, 44px);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.contact-panel p {
  color: rgba(255, 255, 255, 0.78);
}

.contact-panel dl {
  display: grid;
  gap: 18px;
  margin: 32px 0 0;
}

.contact-panel div {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 18px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.contact-panel dt {
  color: #7ff1e7;
  font-weight: 800;
}

.contact-panel dd {
  margin: 0;
  color: rgba(255, 255, 255, 0.84);
}

.back-top {
  position: fixed;
  right: 22px;
  bottom: 24px;
  z-index: 20;
  width: 46px;
  height: 46px;
  border: 0;
  border-radius: 50%;
  color: var(--white);
  background: var(--teal-dark);
  box-shadow: 0 16px 34px rgba(13, 47, 61, 0.22);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.back-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 28px clamp(20px, 5vw, 72px);
  color: rgba(255, 255, 255, 0.68);
  background: #092634;
  font-size: 14px;
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 620ms ease, transform 620ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 900px) {
  :root {
    --header-height: 68px;
  }

  .site-header {
    padding: 0 20px;
  }

  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    inset: var(--header-height) 14px auto;
    display: grid;
    gap: 0;
    padding: 14px 20px;
    color: var(--ink);
    background: rgba(255, 255, 255, 0.96);
    box-shadow: 0 22px 70px rgba(13, 47, 61, 0.2);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-12px);
    transition: opacity 180ms ease, transform 180ms ease;
    backdrop-filter: blur(18px);
  }

  .site-nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-nav a {
    padding: 15px 0;
    border-bottom: 1px solid var(--line);
  }

  .site-nav a:last-child {
    border-bottom: 0;
  }

  .hero {
    min-height: 84svh;
    padding: calc(var(--header-height) + 46px) 20px 64px;
  }

  .hero::before {
    background-position: 60% center;
  }

  .hero-overlay {
    background:
      linear-gradient(90deg, rgba(6, 31, 43, 0.92), rgba(9, 45, 59, 0.66)),
      linear-gradient(0deg, rgba(4, 26, 34, 0.42), rgba(4, 26, 34, 0.08));
  }

  .intro-layout,
  .service-layout,
  .sustainability-layout,
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .service-copy {
    grid-column: auto;
  }

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

  .delivery-band {
    align-items: flex-start;
    flex-direction: column;
  }

  .sustainability-layout > p {
    padding-left: 22px;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 15px;
  }

  .brand small {
    display: none;
  }

  .hero-title {
    font-size: clamp(52px, 18vw, 78px);
  }

  .hero-actions,
  .button {
    width: 100%;
  }

  .section-inner {
    width: min(100% - 32px, 1120px);
  }

  .intro,
  .strengths,
  .process,
  .services,
  .sustainability,
  .contact {
    padding: 68px 0;
  }

  .strength-item {
    min-height: 0;
  }

  .process-line {
    grid-template-columns: 1fr;
    overflow: visible;
  }

  .process-step {
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  }

  .process-step:last-child {
    border-bottom: 0;
  }

  .contact-panel {
    padding: 24px 20px;
  }

  .contact-panel div {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}