:root {
  --black: #171717;
  --ink: #24211d;
  --charcoal: #2b2b2b;
  --muted: #6e6960;
  --line: #d8d2c8;
  --paper: #f7f7f5;
  --soft: #ece8df;
  --gold: #c9a24d;
  --gold-deep: #8f6d23;
  --white: #fffaf0;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  line-height: 1.7;
}

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

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

.site-header {
  position: fixed;
  z-index: 20;
  inset: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 54px);
  color: var(--white);
  background: rgba(10, 10, 10, 0.82);
  border-bottom: 1px solid rgba(201, 162, 77, 0.24);
  backdrop-filter: blur(16px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 216px;
}

.brand img {
  width: 46px;
  height: 46px;
  object-fit: contain;
  border: 0;
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.15;
}

.brand strong {
  font-size: 16px;
}

.brand small {
  margin-top: 4px;
  color: var(--gold);
  font-size: 11px;
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.8vw, 26px);
  color: rgba(255, 250, 240, 0.82);
  font-size: 14px;
}

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

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(201, 162, 77, 0.38);
  background: transparent;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 6px auto;
  background: var(--gold);
}

.hero {
  position: relative;
  min-height: 92vh;
  overflow: hidden;
  color: var(--white);
  background: #090909;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 74% 45%, rgba(255, 255, 255, 0.12), transparent 25%),
    linear-gradient(110deg, rgba(0, 0, 0, 0.98) 0%, rgba(0, 0, 0, 0.86) 44%, rgba(20, 20, 20, 0.74) 100%);
}

.hero-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(201, 162, 77, 0.13) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 162, 77, 0.1) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: linear-gradient(90deg, transparent, #000 42%, transparent);
}

.hero-content,
.container {
  width: min(1180px, calc(100% - 36px));
  margin: 0 auto;
}

.hero-content {
  position: relative;
  z-index: 1;
  min-height: 92vh;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(330px, 0.72fr);
  gap: clamp(34px, 6vw, 88px);
  align-items: center;
  padding: 112px 0 78px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 12px;
  font-size: clamp(52px, 8vw, 96px);
  line-height: 1.04;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.16;
}

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

.tagline {
  margin-bottom: 22px;
  color: var(--gold);
  font-size: clamp(24px, 3vw, 38px);
  font-weight: 800;
}

.lead {
  max-width: 720px;
  color: rgba(255, 250, 240, 0.78);
  font-size: clamp(17px, 2vw, 21px);
}

.hero-actions,
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.btn {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  color: var(--white);
  border: 1px solid rgba(201, 162, 77, 0.44);
  background: rgba(23, 23, 23, 0.7);
  font-weight: 800;
}

.btn.primary {
  color: #17120a;
  border-color: var(--gold);
  background: linear-gradient(135deg, #f1d57f, var(--gold));
}

.btn.ghost {
  background: transparent;
}

.hero-mark {
  width: min(420px, 100%);
  justify-self: center;
  padding: 0;
  background: transparent;
  border: 0;
  box-shadow: none;
}

.hero-mark img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
  filter: drop-shadow(0 18px 42px rgba(0, 0, 0, 0.34));
}

.mark-caption {
  display: grid;
  gap: 4px;
  margin-top: 18px;
  color: rgba(255, 250, 240, 0.78);
}

.mark-caption strong {
  color: var(--gold);
}

section {
  padding: clamp(76px, 10vw, 120px) 0;
}

.band {
  background: var(--soft);
}

.dark {
  color: var(--white);
  background: linear-gradient(135deg, rgba(201, 162, 77, 0.12), transparent 34%), #111;
}

.section-head {
  max-width: 760px;
  margin-bottom: 38px;
}

.section-head.narrow {
  margin-inline: auto;
  text-align: center;
}

.question-grid,
.service-grid,
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.question-grid article,
.service-grid article,
.case-grid article,
.principles,
.research-list article,
.lead-form,
.contact-panel {
  border: 1px solid rgba(23, 23, 23, 0.12);
  background: rgba(255, 255, 255, 0.68);
  box-shadow: 0 10px 34px rgba(23, 23, 23, 0.07);
}

.question-grid article,
.case-grid article,
.service-grid article,
.principles,
.research-list article,
.lead-form {
  padding: 28px;
}

.question-grid strong,
.research-list strong,
.num {
  color: var(--gold-deep);
  font-weight: 900;
}

.question-grid strong {
  display: block;
  margin-bottom: 12px;
  font-size: 24px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 1.05fr);
  gap: clamp(32px, 6vw, 84px);
  align-items: start;
}

.split.reverse {
  grid-template-columns: minmax(320px, 1.05fr) minmax(0, 0.95fr);
}

.principles {
  color: var(--white);
  background: var(--black);
}

.principles ul {
  margin: 0;
  padding-left: 20px;
}

.principles li + li {
  margin-top: 12px;
}

.formula {
  width: fit-content;
  max-width: 100%;
  margin: 0 auto 32px;
  padding: 14px 22px;
  color: var(--gold);
  border: 1px solid rgba(201, 162, 77, 0.36);
  background: rgba(255, 255, 255, 0.04);
  font-weight: 800;
  text-align: center;
}

.rings,
.service-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}

.rings article {
  min-height: 170px;
  padding: 24px 18px;
  border: 1px solid rgba(201, 162, 77, 0.28);
  background: rgba(255, 255, 255, 0.06);
}

.rings strong,
.rings span,
.research-list strong,
.research-list span {
  display: block;
}

.rings strong {
  margin-bottom: 12px;
  color: var(--gold);
  font-size: 21px;
}

.rings span {
  color: rgba(255, 250, 240, 0.76);
}

.service-grid {
  grid-template-columns: repeat(4, 1fr);
}

.service-grid article {
  min-height: 328px;
}

.service-grid small {
  display: block;
  margin-top: 18px;
  color: var(--muted);
}

.flow {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 8px;
  margin-top: 28px;
}

.flow span {
  min-height: 58px;
  display: grid;
  place-items: center;
  padding: 8px;
  color: var(--white);
  background: var(--black);
  border-bottom: 3px solid var(--gold);
  font-size: 14px;
  text-align: center;
}

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

.text-link {
  display: inline-block;
  margin-top: 12px;
  color: var(--gold-deep);
  font-weight: 900;
  border-bottom: 1px solid currentColor;
}

.resource-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.resource-tags span {
  padding: 8px 12px;
  border: 1px solid rgba(201, 162, 77, 0.34);
  background: rgba(255, 255, 255, 0.06);
}

.lead-form {
  display: grid;
  gap: 14px;
  color: var(--ink);
  background: var(--paper);
}

.lead-form label {
  display: grid;
  gap: 6px;
  font-weight: 800;
}

input,
select,
textarea {
  width: 100%;
  min-height: 46px;
  padding: 10px 12px;
  color: var(--ink);
  border: 1px solid var(--line);
  background: #fff;
  font: inherit;
}

textarea {
  min-height: 104px;
  resize: vertical;
}

.form-note {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.form-note.submitted {
  color: var(--gold-deep);
  font-weight: 800;
}

.contact-panel {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: clamp(24px, 5vw, 58px);
  align-items: center;
  padding: clamp(24px, 5vw, 48px);
  color: var(--white);
  background: var(--black);
}

.contact-panel img {
  aspect-ratio: 1;
  object-fit: contain;
  border: 0;
}

.compliance {
  margin: 28px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.footer {
  padding: 24px 0;
  color: rgba(255, 250, 240, 0.72);
  background: #0b0b0b;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 18px;
}

@media (max-width: 980px) {
  .menu-toggle {
    display: block;
  }

  .nav {
    position: absolute;
    top: 75px;
    left: 18px;
    right: 18px;
    display: none;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    background: rgba(10, 10, 10, 0.96);
    border: 1px solid rgba(201, 162, 77, 0.28);
  }

  .nav.open {
    display: grid;
  }

  .nav a {
    padding: 14px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .hero-content,
  .split,
  .split.reverse,
  .contact-panel {
    grid-template-columns: 1fr;
  }

  .hero-mark {
    max-width: 480px;
  }

  .question-grid,
  .service-grid,
  .case-grid,
  .rings {
    grid-template-columns: 1fr 1fr;
  }

  .flow {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-width: 640px) {
  .brand span {
    display: none;
  }

  .hero-actions,
  .contact-actions {
    display: grid;
  }

  .question-grid,
  .service-grid,
  .case-grid,
  .rings,
  .flow {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    display: grid;
  }
}