:root {
  --ink: #231b17;
  --muted: #665950;
  --paper: #f7f1e8;
  --warm: #e8d8c2;
  --red: #b43d2e;
  --red-dark: #873024;
  --green: #315f58;
  --line: rgba(35, 27, 23, 0.14);
  --white: #fffaf2;
  --shadow: 0 18px 50px rgba(35, 27, 23, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family:
    "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(18px, 5vw, 64px);
  color: #fffaf2;
  background: linear-gradient(180deg, rgba(26, 18, 13, 0.72), rgba(26, 18, 13, 0));
  transition: background 180ms ease, box-shadow 180ms ease;
}

.site-header.is-scrolled {
  background: rgba(26, 18, 13, 0.86);
  box-shadow: 0 14px 34px rgba(26, 18, 13, 0.14);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--red);
  color: #fff;
  font-size: 18px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.22);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 28px);
  font-size: 15px;
}

.nav-links a {
  opacity: 0.92;
}

.nav-cta {
  padding: 9px 15px;
  border: 1px solid rgba(255, 250, 242, 0.56);
  border-radius: 999px;
}

.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  color: #fffaf2;
}

.hero-image,
.hero-shade {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-image {
  object-fit: cover;
  object-position: center;
  filter: saturate(0.95) contrast(1.02);
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(25, 18, 12, 0.88) 0%, rgba(25, 18, 12, 0.58) 42%, rgba(25, 18, 12, 0.16) 78%),
    linear-gradient(180deg, rgba(25, 18, 12, 0.34) 0%, rgba(25, 18, 12, 0.1) 52%, rgba(247, 241, 232, 1) 100%);
}

.hero-content {
  position: relative;
  width: min(720px, calc(100% - 36px));
  margin-left: clamp(18px, 7vw, 92px);
  padding-top: 72px;
}

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

.hero .eyebrow {
  color: #ffd5b6;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 680px;
  margin-bottom: 22px;
  font-size: clamp(44px, 7vw, 86px);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  max-width: 780px;
  margin-bottom: 18px;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
  font-size: 21px;
  line-height: 1.25;
}

.hero-copy {
  max-width: 660px;
  margin-bottom: 32px;
  color: rgba(255, 250, 242, 0.9);
  font-size: clamp(17px, 2vw, 21px);
}

.hero-actions,
.form-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 22px;
  border: 0;
  border-radius: 8px;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

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

.button-primary {
  background: var(--red);
  color: #fff;
  box-shadow: 0 14px 34px rgba(120, 35, 25, 0.28);
}

.button-primary:hover {
  background: var(--red-dark);
}

.button-secondary {
  color: #fffaf2;
  background: rgba(255, 250, 242, 0.14);
  border: 1px solid rgba(255, 250, 242, 0.38);
}

.quick-band {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.quick-band div {
  min-height: 132px;
  padding: 30px clamp(22px, 4vw, 54px);
  background: #fffaf2;
}

.quick-band strong {
  display: block;
  margin-bottom: 6px;
  font-size: 28px;
  line-height: 1.15;
}

.quick-band span {
  color: var(--muted);
}

.photo-story,
.visual-clues,
.image-banner,
.start-section {
  padding: clamp(72px, 10vw, 130px) clamp(18px, 6vw, 78px);
  scroll-margin-top: 82px;
}

.photo-story {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  grid-template-rows: repeat(2, minmax(230px, 1fr));
  gap: 18px;
  background: #fffaf2;
}

.story-card {
  position: relative;
  min-height: 300px;
  margin: 0;
  overflow: hidden;
  border-radius: 8px;
  background: var(--warm);
  box-shadow: var(--shadow);
}

.story-card.large {
  grid-row: span 2;
  min-height: 620px;
}

.story-card img,
.image-banner img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.story-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(22, 16, 12, 0.02), rgba(22, 16, 12, 0.72));
}

.story-card figcaption {
  position: absolute;
  left: 24px;
  right: 24px;
  bottom: 24px;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 14px;
  color: #fffaf2;
}

.story-card figcaption span {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--red);
  font-weight: 900;
}

.story-card figcaption strong {
  font-size: clamp(24px, 3vw, 36px);
  line-height: 1.05;
}

.visual-clues {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(320px, 1.1fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: start;
  background: var(--paper);
}

.visual-heading h2 {
  margin-bottom: 0;
}

.clue-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.clue-strip span {
  min-height: 82px;
  display: flex;
  align-items: center;
  padding: 18px 20px;
  border-left: 4px solid var(--red);
  background: #fffaf2;
  font-weight: 800;
  box-shadow: 0 10px 26px rgba(35, 27, 23, 0.06);
}

.image-banner {
  display: grid;
  grid-template-columns: minmax(320px, 1.15fr) minmax(280px, 0.85fr);
  gap: 0;
  align-items: stretch;
  background: var(--green);
  color: #fffaf2;
  padding-top: 0;
  padding-bottom: 0;
}

.image-banner img {
  min-height: 440px;
  max-height: 620px;
}

.image-banner div {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(44px, 6vw, 82px);
}

.image-banner .eyebrow {
  color: #ffd5b6;
}

.image-banner p,
.start-copy p {
  color: var(--muted);
}

.image-banner div p:last-child {
  color: rgba(255, 250, 242, 0.82);
}

.start-section {
  display: grid;
  grid-template-columns: minmax(280px, 0.75fr) minmax(320px, 1.25fr);
  gap: clamp(32px, 6vw, 86px);
  align-items: start;
  background: #fffaf2;
}

.lead-form {
  padding: clamp(22px, 4vw, 38px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

label {
  display: block;
  margin-bottom: 18px;
  color: var(--ink);
  font-weight: 800;
}

input,
select,
textarea {
  width: 100%;
  margin-top: 8px;
  padding: 13px 14px;
  border: 1px solid rgba(35, 27, 23, 0.2);
  border-radius: 8px;
  background: #fffaf2;
  color: var(--ink);
  font: inherit;
}

textarea {
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
  outline: 3px solid rgba(180, 61, 46, 0.18);
  border-color: var(--red);
}

.form-row label {
  flex: 1 1 220px;
}

.form-note {
  min-height: 24px;
  margin: 16px 0 0;
  color: var(--green);
  font-weight: 800;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px clamp(18px, 6vw, 78px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  background: var(--paper);
}

.site-footer span:first-child {
  color: var(--ink);
  font-weight: 900;
}

@media (max-width: 900px) {
  .site-header {
    align-items: flex-start;
    background: rgba(26, 18, 13, 0.72);
  }

  .nav-links {
    display: none;
  }

  .hero {
    min-height: 86vh;
  }

  .hero-content {
    margin: 0 auto;
  }

  .hero-shade {
    background:
      linear-gradient(90deg, rgba(25, 18, 12, 0.88), rgba(25, 18, 12, 0.48)),
      linear-gradient(180deg, rgba(25, 18, 12, 0.2), rgba(247, 241, 232, 1));
  }

  .quick-band,
  .photo-story,
  .visual-clues,
  .image-banner,
  .start-section {
    grid-template-columns: 1fr;
  }

  .photo-story {
    grid-template-rows: none;
  }

  .story-card.large {
    grid-row: auto;
    min-height: 360px;
  }
}

@media (max-width: 560px) {
  .hero-actions,
  .button {
    width: 100%;
  }

  .clue-strip {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-direction: column;
  }
}