:root {
  --ink: #2c1608;
  --text: #3d2918;
  --muted: #806a57;
  --line: #ead8c5;
  --mist: #fff0df;
  --surface: #fff9ef;
  --white: #ffffff;
  --flame: #ff6b35;
  --gold: #ffd700;
  --blue: #b87333;
  --amber: #ffd700;
  --rose: #8b4513;
  --glass: rgba(255, 249, 239, 0.62);
  --glass-strong: rgba(255, 255, 255, 0.46);
  --glass-line: rgba(255, 255, 255, 0.68);
  --shadow: 0 12px 14px rgba(101, 67, 33, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.65;
  overflow-x: hidden;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 70px;
  padding: 0 clamp(20px, 5vw, 72px);
  border-bottom: 1px solid rgba(101, 67, 33, 0.14);
  background: var(--glass);
  backdrop-filter: blur(22px) saturate(1.35);
}

.brand,
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 850;
}

.brand-logo {
  display: block;
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 10px;
}

.brand-name {
  font-size: 18px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  color: var(--muted);
  font-size: 14px;
}

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

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--white);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--ink);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 520px);
  gap: clamp(36px, 7vw, 96px);
  align-items: end;
  min-height: clamp(650px, calc(100vh - 130px), 790px);
  padding: clamp(56px, 7vw, 96px) clamp(20px, 6vw, 92px) clamp(44px, 6vw, 72px);
  background:
    linear-gradient(115deg, rgba(255, 215, 0, 0.18) 0%, transparent 24%),
    linear-gradient(105deg, #fff1df 0%, #fff9ef 48%, #fff0df 100%);
  overflow: hidden;
}

.hero-copy,
.briefing,
.skills-copy,
.skill-ledger,
.partner-section > *,
.contact-section > * {
  min-width: 0;
}

.site-kicker,
.section-label {
  display: inline-flex;
  max-width: 100%;
  margin: 0 0 18px;
  color: var(--flame);
  font-size: 15px;
  font-weight: 750;
  line-height: 1.45;
}

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

h1 {
  margin-bottom: 18px;
  font-size: clamp(68px, 10.5vw, 144px);
  line-height: 0.92;
  letter-spacing: 0;
  text-wrap: balance;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(34px, 5.2vw, 72px);
  line-height: 1.02;
  letter-spacing: 0;
  text-wrap: balance;
}

h3 {
  margin-bottom: 10px;
  font-size: 22px;
  line-height: 1.25;
}

.hero-line {
  max-width: 840px;
  margin-bottom: 24px;
  color: var(--text);
  font-size: clamp(28px, 4vw, 52px);
  font-weight: 750;
  line-height: 1.14;
  text-wrap: balance;
}

.hero-lede,
.section-intro p,
.skills-copy p,
.partner-section p,
.contact-copy p {
  max-width: 760px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.85;
  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: 48px;
  padding: 0 24px;
  border-radius: 10px;
  font-weight: 800;
  transition: transform 160ms ease-out, background-color 160ms ease-out, border-color 160ms ease-out;
}

.button:hover {
  transform: translateY(-1px);
}

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

.button.secondary {
  border: 1px solid var(--line);
  background: var(--white);
}

.briefing {
  align-self: center;
  width: 100%;
  max-width: 520px;
  justify-self: end;
  overflow: hidden;
  border-radius: 16px;
  border: 1px solid var(--glass-line);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.62), rgba(255, 240, 223, 0.42));
  backdrop-filter: blur(26px) saturate(1.35);
  box-shadow: var(--shadow);
}

.briefing-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 20px;
  border-bottom: 1px solid rgba(101, 67, 33, 0.16);
  color: var(--muted);
  font-size: 14px;
}

.briefing-head strong {
  color: var(--ink);
  font-size: 13px;
}

.briefing-main {
  padding: 28px 28px 24px;
}

.briefing-main p {
  color: var(--muted);
  font-size: 17px;
}

.briefing-main strong {
  display: block;
  color: var(--ink);
  font-size: clamp(28px, 3vw, 42px);
  line-height: 1.14;
  text-wrap: balance;
}

.briefing-list {
  margin: 0;
  border-top: 1px solid rgba(101, 67, 33, 0.16);
}

.briefing-list div {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 28px;
  border-bottom: 1px solid rgba(101, 67, 33, 0.16);
}

.briefing-list div:last-child {
  border-bottom: 0;
}

.briefing-list dt {
  color: var(--flame);
  font-weight: 850;
}

.briefing-list dd {
  margin: 0;
  color: var(--muted);
}

.method-section,
.skills-section,
.partner-section,
.contact-section {
  padding: clamp(72px, 9vw, 128px) clamp(20px, 6vw, 92px);
}

.method-section {
  background: #fffaf3;
}

.section-intro {
  max-width: 980px;
  margin-bottom: 44px;
}

.method-rail {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.method-rail article {
  padding: clamp(24px, 4vw, 42px) clamp(18px, 3vw, 30px);
  border-right: 1px solid var(--line);
}

.method-rail article:last-child {
  border-right: 0;
}

.method-rail span {
  display: block;
  margin-bottom: 36px;
  color: var(--muted);
  font-size: 14px;
}

.method-rail p,
.skill-ledger p {
  margin-bottom: 0;
  color: var(--muted);
}

.skills-section {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(420px, 1fr);
  gap: clamp(36px, 7vw, 88px);
  align-items: start;
  background:
    linear-gradient(180deg, rgba(255, 215, 0, 0.16), transparent 58%),
    var(--mist);
}

.skill-ledger {
  border-top: 1px solid rgba(101, 67, 33, 0.18);
}

.skill-ledger div {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid rgba(101, 67, 33, 0.18);
}

.skill-ledger span {
  color: var(--ink);
  font-weight: 850;
}

.partner-section {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1fr) 260px;
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
  background: linear-gradient(180deg, var(--surface), #fff3e5);
}

.partner-stamp {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 180px;
  padding: 26px;
  border: 1px solid var(--glass-line);
  border-radius: 16px;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.58), rgba(255, 215, 0, 0.16));
  backdrop-filter: blur(22px) saturate(1.3);
}

.partner-stamp img {
  width: min(100%, 210px);
  height: auto;
  margin-bottom: 18px;
}

.partner-stamp span,
.partner-stamp small {
  display: block;
  color: var(--muted);
}

.partner-stamp strong {
  display: block;
  margin: 10px 0;
  font-size: 28px;
  line-height: 1.12;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: clamp(36px, 8vw, 96px);
  align-items: center;
  color: var(--white);
  background:
    linear-gradient(135deg, rgba(255, 107, 53, 0.16), transparent 38%),
    linear-gradient(180deg, #2c1608, #1f0f05);
}

.contact-section .section-label,
.email-link {
  color: #ffd700;
}

.contact-copy p {
  color: rgba(255, 255, 255, 0.76);
}

.email-link {
  font-weight: 850;
}

.qr-wrap {
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.13);
  backdrop-filter: blur(20px) saturate(1.25);
  text-align: center;
}

.qr-wrap img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
  border-radius: 10px;
  background: var(--white);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.62);
}

.qr-wrap p {
  margin: 14px 0 0;
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}

.site-footer {
  padding: 36px clamp(20px, 6vw, 92px) 44px;
  color: rgba(255, 255, 255, 0.72);
  background: #1f0f05;
  font-size: 14px;
}

.footer-brand {
  margin-bottom: 14px;
  color: var(--white);
}

.partner-note {
  color: rgba(255, 255, 255, 0.62);
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 14px;
}

.site-footer a:hover {
  color: var(--white);
}

.policy-main {
  padding: 72px clamp(20px, 6vw, 92px) 96px;
  background: var(--surface);
}

.policy-article {
  max-width: 840px;
  margin: 0 auto;
}

.policy-article h1 {
  margin-bottom: 10px;
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.05;
}

.policy-article h2 {
  margin-top: 36px;
  font-size: 24px;
}

.policy-article p {
  color: var(--text);
  overflow-wrap: anywhere;
}

.policy-article a {
  color: var(--flame);
  font-weight: 800;
}

.updated {
  color: var(--muted);
}

@media (max-width: 1020px) {
  .hero,
  .skills-section,
  .partner-section,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .method-rail {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .method-rail article:nth-child(2) {
    border-right: 0;
  }

  .method-rail article:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }
}

@media (max-width: 720px) {
  .site-header {
    min-height: 64px;
    padding: 0 20px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    left: 20px;
    right: 20px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--white);
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 12px;
  }

  .hero {
    min-height: auto;
    padding-top: 64px;
    overflow-x: clip;
  }

  h1 {
    max-width: 100%;
    font-size: clamp(42px, 11vw, 48px);
    line-height: 1;
  }

  h2 {
    font-size: 36px;
  }

  .hero-line {
    font-size: 28px;
  }

  .site-kicker,
  .hero-line,
  .hero-lede,
  .briefing {
    width: 100%;
    max-width: 100%;
  }

  .briefing {
    justify-self: stretch;
  }

  .briefing-head {
    flex-wrap: wrap;
  }

  .hero-lede,
  .section-intro p,
  .skills-copy p,
  .partner-section p,
  .contact-copy p {
    font-size: 16px;
    word-break: break-word;
  }

  .briefing-list div,
  .skill-ledger div {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .method-rail {
    grid-template-columns: 1fr;
  }

  .method-rail article {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .method-rail article:last-child {
    border-bottom: 0;
  }

  .method-rail span {
    margin-bottom: 18px;
  }

  .contact-section {
    gap: 30px;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }
}