:root {
  --page-bg: #f4f7fa;
  --surface: #ffffff;
  --surface-soft: #eaf0f6;
  --text: #172033;
  --text-soft: #566579;
  --text-faint: #7a8798;
  --line: #d7e0e9;
  --accent: #1459c7;
  --accent-hover: #0e49aa;
  --accent-soft: #e7effc;
  --shadow: 0 22px 70px rgba(28, 48, 76, .16);
  --radius-small: 8px;
  --radius-medium: 16px;
  --radius-large: 28px;
  --content-width: 1180px;
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--page-bg);
}

body {
  min-width: 320px;
  margin: 0;
  background: var(--page-bg);
  color: var(--text);
  font-family: inherit;
  letter-spacing: 0;
  overflow-x: hidden;
}

a {
  color: inherit;
}

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

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

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: var(--radius-small);
  background: var(--text);
  color: #fff;
  text-decoration: none;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(215, 224, 233, .88);
  background: rgba(244, 247, 250, .94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.site-header-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  width: min(calc(100% - 40px), var(--content-width));
  height: 72px;
  margin: 0 auto;
}

.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}

.wordmark span {
  font-size: 20px;
  font-weight: 760;
}

.wordmark small {
  color: var(--text-faint);
  font-size: 12px;
  font-weight: 650;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
}

.site-nav a,
.site-footer a {
  color: var(--text-soft);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--accent);
}

.header-buy-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: var(--radius-small);
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 720;
  text-decoration: none;
  white-space: nowrap;
}

.brand-hero {
  position: relative;
  min-height: clamp(600px, 78svh, 760px);
  overflow: hidden;
  background-color: #e8eef3;
  background-image: url("/assets/hero-bottle-desktop.webp");
  background-position: center 52%;
  background-size: cover;
}

.hero-shade {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(239, 244, 248, .97) 0%, rgba(239, 244, 248, .89) 38%, rgba(239, 244, 248, .42) 58%, rgba(239, 244, 248, .04) 78%);
}

.hero-inner {
  position: relative;
  display: flex;
  align-items: center;
  width: min(calc(100% - 40px), var(--content-width));
  min-height: inherit;
  margin: 0 auto;
  padding: 32px 0;
}

.hero-copy {
  max-width: 580px;
}

.hero-kicker,
.section-kicker {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 760;
}

.hero-copy h1 {
  margin: 0;
  font-size: clamp(48px, 5.1vw, 68px);
  font-weight: 760;
  line-height: 1.12;
  letter-spacing: 0;
}

.hero-copy h1 span {
  display: block;
  white-space: nowrap;
}

.hero-note {
  margin: 22px 0 0;
  color: var(--text-soft);
  font-size: 17px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: var(--radius-small);
  font-size: 15px;
  font-weight: 720;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color .18s ease, border-color .18s ease, color .18s ease, transform .18s ease;
}

.button:active,
.header-buy-link:active {
  transform: scale(.98);
}

.button-primary {
  background: var(--accent);
  color: #fff;
}

.button-primary:hover,
.button-primary:focus-visible,
.header-buy-link:hover,
.header-buy-link:focus-visible {
  background: var(--accent-hover);
}

.button-secondary {
  border-color: #aab8c8;
  background: rgba(255, 255, 255, .66);
  color: var(--text);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}

[data-wechat-shop][aria-disabled="true"] {
  border-color: #7590b5;
  background: #7590b5;
  color: #fff;
  cursor: not-allowed;
  pointer-events: none;
}

.product-photo {
  display: block;
  width: 100%;
  height: auto;
  filter: drop-shadow(0 22px 24px rgba(28, 48, 76, .18));
}

.feature-strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.feature-strip-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  width: min(100%, var(--content-width));
  margin: 0 auto;
}

.feature-strip span {
  position: relative;
  padding: 23px 16px;
  color: var(--text);
  font-size: 15px;
  font-weight: 700;
  text-align: center;
}

.feature-strip span + span::before {
  position: absolute;
  top: 18px;
  bottom: 18px;
  left: 0;
  width: 1px;
  background: var(--line);
  content: "";
}

.section {
  width: min(calc(100% - 40px), var(--content-width));
  margin: 0 auto;
  padding: 112px 0;
}

.section-heading {
  max-width: 660px;
}

.section-heading h2,
.scene-copy h2,
.product-copy h2,
.purchase-section h2 {
  margin: 0;
  color: var(--text);
  font-size: clamp(32px, 4.4vw, 54px);
  font-weight: 750;
  line-height: 1.18;
  letter-spacing: 0;
  text-wrap: balance;
}

.section-heading > p:last-child,
.product-intro,
.purchase-section > p:not(.section-kicker) {
  margin: 18px 0 0;
  color: var(--text-soft);
  font-size: 17px;
  line-height: 1.75;
}

.process-flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 64px;
  border-top: 1px solid var(--line);
}

.process-flow article {
  min-height: 240px;
  padding: 30px 34px 30px 0;
}

.process-flow article + article {
  padding-left: 34px;
  border-left: 1px solid var(--line);
}

.process-label {
  margin: 0 0 30px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 750;
}

.process-flow h3,
.trust-points h3 {
  margin: 0;
  color: var(--text);
  font-size: 21px;
  line-height: 1.4;
}

.process-flow article > p:last-child,
.trust-points p {
  margin: 12px 0 0;
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.75;
}

.process-notice {
  margin: 28px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  color: #334a67;
  font-size: 14px;
  line-height: 1.65;
}

.scene-section {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr);
  gap: 72px;
  align-items: center;
  width: 100%;
  max-width: none;
  padding: 0;
  background: var(--surface-soft);
}

.scene-photo {
  min-height: 720px;
  overflow: hidden;
}

.scene-photo img {
  width: 100%;
  height: 720px;
  object-fit: cover;
}

.scene-copy {
  max-width: 560px;
  padding: 80px 40px 80px 0;
}

.scene-list {
  margin-top: 42px;
}

.scene-list div {
  display: grid;
  grid-template-columns: minmax(120px, .72fr) 1.3fr;
  gap: 22px;
  padding: 18px 0;
  border-top: 1px solid #cfd9e3;
}

.scene-list strong {
  font-size: 15px;
}

.scene-list span {
  color: var(--text-soft);
  font-size: 14px;
  line-height: 1.65;
}

.product-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, .75fr);
  gap: 100px;
  align-items: center;
}

.product-copy {
  max-width: 630px;
}

.product-facts {
  margin: 44px 0 0;
  border-top: 1px solid var(--line);
}

.product-facts div {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 28px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.product-facts dt {
  color: var(--text-faint);
  font-size: 13px;
}

.product-facts dd {
  margin: 0;
  color: var(--text);
  font-size: 15px;
  font-weight: 650;
}

.product-scale {
  position: relative;
  display: flex;
  min-height: 620px;
  align-items: center;
  justify-content: center;
  padding: 42px 46px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: transparent;
}

.product-photo-detail {
  width: min(310px, 78%);
  filter: drop-shadow(0 28px 30px rgba(28, 48, 76, .18));
  transform: rotate(-1deg);
}

.trust-section {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 100px;
  border-top: 1px solid var(--line);
}

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

.trust-points article {
  display: grid;
  grid-template-columns: minmax(150px, .7fr) 1.3fr;
  gap: 28px;
  padding: 25px 0;
  border-bottom: 1px solid var(--line);
}

.trust-points p {
  margin: 0;
}

.faq-section {
  display: grid;
  grid-template-columns: minmax(250px, .65fr) 1.35fr;
  gap: 100px;
  border-top: 1px solid var(--line);
}

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

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  position: relative;
  padding: 24px 44px 24px 0;
  color: var(--text);
  font-size: 17px;
  font-weight: 680;
  list-style: none;
  cursor: pointer;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  position: absolute;
  top: 21px;
  right: 2px;
  color: var(--accent);
  font-size: 22px;
  font-weight: 400;
  content: "+";
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-list p {
  max-width: 680px;
  margin: -6px 0 24px;
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.75;
}

.purchase-section {
  padding-top: 96px;
  padding-bottom: 110px;
  border-top: 1px solid var(--line);
  text-align: center;
}

.purchase-section h2 {
  max-width: 780px;
  margin: 0 auto;
}

.purchase-section > p:not(.section-kicker) {
  margin-right: auto;
  margin-left: auto;
}

.purchase-button {
  margin-top: 28px;
}

.purchase-button[aria-disabled="true"] {
  background: #7590b5;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  width: min(calc(100% - 40px), var(--content-width));
  margin: 0 auto;
  padding: 34px 0 42px;
  border-top: 1px solid var(--line);
}

.site-footer > div {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.site-footer strong {
  font-size: 16px;
}

.site-footer span {
  color: var(--text-faint);
  font-size: 12px;
}

.site-footer nav {
  display: flex;
  gap: 24px;
}

:focus-visible {
  outline: 3px solid rgba(20, 89, 199, .32);
  outline-offset: 3px;
}

@media (max-width: 900px) {
  .site-nav {
    display: none;
  }

  .site-header-inner {
    grid-template-columns: 1fr auto;
    height: 64px;
  }

  .brand-hero {
    min-height: clamp(620px, 82svh, 760px);
    background-position: 58% center;
  }

  .hero-inner {
    padding: 36px 0;
  }

  .hero-copy h1 {
    font-size: clamp(46px, 7.2vw, 62px);
  }

  .scene-section {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .scene-photo,
  .scene-photo img {
    height: 520px;
    min-height: 0;
  }

  .scene-copy {
    width: min(calc(100% - 40px), 680px);
    max-width: none;
    margin: 0 auto;
    padding: 72px 0 84px;
  }

  .product-section,
  .trust-section,
  .faq-section {
    grid-template-columns: 1fr;
    gap: 58px;
  }

  .product-scale {
    min-height: 560px;
  }
}

@media (max-width: 640px) {
  .site-header-inner,
  .hero-inner,
  .section,
  .site-footer {
    width: min(calc(100% - 32px), var(--content-width));
  }

  .wordmark small {
    display: none;
  }

  .header-buy-link {
    min-height: 40px;
    padding: 0 14px;
    font-size: 13px;
  }

  .brand-hero {
    min-height: calc(100svh - 96px);
    max-height: none;
    background-image: url("/assets/hero-bottle-mobile.webp");
    background-position: 66% center;
  }

  .hero-shade {
    background: linear-gradient(180deg, rgba(239, 244, 248, .94) 0%, rgba(239, 244, 248, .84) 34%, rgba(239, 244, 248, .28) 61%, rgba(239, 244, 248, .03) 82%);
  }

  .hero-inner {
    display: block;
    padding: 44px 0 34px;
  }

  .hero-copy {
    position: relative;
    z-index: 1;
    max-width: 330px;
  }

  .hero-kicker {
    margin-bottom: 10px;
    font-size: 12px;
  }

  .hero-copy h1 {
    font-size: clamp(34px, 10vw, 44px);
  }

  .hero-note {
    max-width: 260px;
    margin-top: 16px;
    font-size: 14px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 9px;
    width: min(100%, 190px);
    margin-top: 24px;
  }

  .button {
    width: 100%;
    min-height: 48px;
    padding: 0 16px;
  }

  .feature-strip-inner {
    grid-template-columns: repeat(2, 1fr);
  }

  .feature-strip span {
    padding: 18px 10px;
    font-size: 13px;
  }

  .feature-strip span:nth-child(3),
  .feature-strip span:nth-child(4) {
    border-top: 1px solid var(--line);
  }

  .feature-strip span:nth-child(3)::before {
    content: none;
  }

  .feature-strip span + span::before {
    top: 12px;
    bottom: 12px;
  }

  .section {
    padding: 76px 0;
  }

  .section-heading h2,
  .scene-copy h2,
  .product-copy h2,
  .purchase-section h2 {
    font-size: clamp(30px, 9.5vw, 42px);
  }

  .section-heading > p:last-child,
  .product-intro,
  .purchase-section > p:not(.section-kicker) {
    font-size: 15px;
  }

  .process-flow {
    grid-template-columns: 1fr;
    margin-top: 42px;
  }

  .process-flow article {
    min-height: 0;
    padding: 24px 0;
    border-bottom: 1px solid var(--line);
  }

  .process-flow article + article {
    padding-left: 0;
    border-left: 0;
  }

  .process-label {
    margin-bottom: 12px;
  }

  .scene-photo,
  .scene-photo img {
    height: 420px;
  }

  .scene-copy {
    width: min(calc(100% - 32px), 680px);
    padding: 64px 0 72px;
  }

  .scene-list {
    margin-top: 32px;
  }

  .scene-list div {
    grid-template-columns: 1fr;
    gap: 7px;
    padding: 16px 0;
  }

  .product-section,
  .trust-section,
  .faq-section {
    gap: 42px;
  }

  .product-facts div {
    grid-template-columns: 80px 1fr;
    gap: 18px;
  }

  .product-scale {
    min-height: 520px;
    padding: 42px 24px 34px;
  }

  .product-photo-detail {
    width: min(245px, 76%);
  }

  .trust-points article {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-footer > div {
    align-items: flex-start;
    flex-direction: column;
    gap: 5px;
  }

  .site-footer nav {
    flex-wrap: wrap;
    gap: 12px 20px;
  }
}

@media (max-width: 380px) {
  .brand-hero {
    min-height: 500px;
  }

  .hero-copy h1 {
    font-size: 36px;
  }

  .hero-note {
    max-width: 170px;
  }

  .hero-actions {
    width: 154px;
  }

  .hero-actions .button {
    padding-right: 6px;
    padding-left: 6px;
    font-size: 12px;
  }

}

@media (min-width: 1600px) {
  .brand-hero {
    background-position: right center;
    background-size: auto 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}