:root {
  --ink: #16181c;
  --ink-soft: #3a3f47;
  --muted: #6b7280;
  --paper: #f3f6f8;
  --paper-2: #e8eef3;
  --line: rgba(22, 24, 28, 0.1);
  --accent: #b5122a;
  --accent-deep: #8c0e20;
  --sky: #c5d5e2;
  --sky-deep: #7a96ad;
  --wood: #6d5846;
  --max: 1120px;
  --nav-h: 72px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

button,
.btn {
  font: inherit;
}

.container {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

.display {
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.2;
}

/* ---------- Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  backdrop-filter: blur(14px);
  background: rgba(243, 246, 248, 0.88);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(243, 246, 248, 0.96);
}

.nav {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  min-width: 0;
}

.brand-en {
  font-family: "Noto Serif SC", serif;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.brand-cn {
  color: var(--accent);
  font-size: 0.92rem;
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-size: 0.92rem;
  color: var(--ink-soft);
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.25rem;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--ink);
}

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

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 0;
  cursor: pointer;
  padding: 0;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  margin: 5px auto;
  background: var(--ink);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: calc(100vh - var(--nav-h));
  display: grid;
  align-items: end;
  overflow: hidden;
  color: #f7fafc;
  background:
    linear-gradient(120deg, rgba(18, 22, 28, 0.82) 0%, rgba(18, 22, 28, 0.45) 48%, rgba(18, 22, 28, 0.7) 100%),
    url("../assets/images/brochure-p1.jpg") center / cover no-repeat;
}

.hero-inner {
  position: relative;
  z-index: 1;
  padding: clamp(3rem, 10vh, 7rem) 0 clamp(3.5rem, 9vh, 6rem);
  max-width: 38rem;
}

.hero-kicker {
  display: inline-block;
  margin-bottom: 1rem;
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(247, 250, 252, 0.72);
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.4rem, 6vw, 4.2rem);
}

.hero h1 span {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.42em;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: rgba(247, 250, 252, 0.88);
}

.hero p {
  margin: 0 0 2rem;
  font-size: 1.05rem;
  color: rgba(247, 250, 252, 0.82);
  max-width: 28rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0.7rem 1.35rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
}

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

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

.btn-primary:hover {
  background: var(--accent-deep);
}

.btn-ghost {
  border-color: rgba(255, 255, 255, 0.45);
  color: #fff;
  background: transparent;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
}

.btn-dark {
  background: var(--ink);
  color: #fff;
}

.btn-dark:hover {
  background: #000;
}

.btn-outline {
  border-color: var(--ink);
  background: transparent;
}

.btn-outline:hover {
  background: var(--ink);
  color: #fff;
}

/* ---------- Sections ---------- */
.section {
  padding: clamp(3.5rem, 8vw, 6rem) 0;
}

.section-alt {
  background: #fff;
}

.section-head {
  margin-bottom: clamp(2rem, 4vw, 3rem);
  max-width: 40rem;
}

.section-head .eyebrow {
  margin: 0 0 0.65rem;
  color: var(--accent);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
}

.section-head h2 {
  margin: 0 0 0.85rem;
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
}

.section-head p {
  margin: 0;
  color: var(--ink-soft);
}

.page-hero {
  padding: 3.5rem 0 2.5rem;
  background:
    linear-gradient(180deg, var(--paper-2), var(--paper));
  border-bottom: 1px solid var(--line);
}

.page-hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(2rem, 4vw, 3rem);
}

.page-hero p {
  margin: 0;
  color: var(--ink-soft);
  max-width: 36rem;
}

/* ---------- Brand pillars ---------- */
.pillars {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.pillar {
  background: #fff;
  padding: 1.6rem 1.35rem 1.75rem;
  min-height: 100%;
  transition: background 0.3s var(--ease);
}

.pillar:hover {
  background: #fafbfc;
}

.pillar-tag {
  display: inline-block;
  margin-bottom: 0.85rem;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--accent);
}

.pillar h3 {
  margin: 0 0 0.75rem;
  font-size: 1.2rem;
}

.pillar ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.pillar li {
  color: var(--ink-soft);
  font-size: 0.95rem;
  padding: 0.28rem 0;
  border-top: 1px solid var(--line);
}

.pillar li:first-child {
  border-top: 0;
  padding-top: 0;
}

/* ---------- Matrix table ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: #fff;
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
  font-size: 0.92rem;
}

.data-table th,
.data-table td {
  padding: 0.95rem 1rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.data-table th {
  background: var(--ink);
  color: #fff;
  font-weight: 500;
  white-space: nowrap;
}

.data-table tbody tr:nth-child(even) {
  background: rgba(197, 213, 226, 0.18);
}

.data-table tbody tr:hover {
  background: rgba(181, 18, 42, 0.05);
}

.data-table .brand-cell {
  font-weight: 600;
  white-space: nowrap;
}

.data-table .brand-cell small {
  display: block;
  margin-top: 0.25rem;
  font-weight: 400;
  color: var(--muted);
  font-size: 0.8rem;
}

.note {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.88rem;
}

/* ---------- Feature strip ---------- */
.feature-strip {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2rem;
  align-items: center;
}

.feature-visual {
  min-height: 320px;
  background:
    linear-gradient(160deg, rgba(22, 24, 28, 0.25), rgba(22, 24, 28, 0.55)),
    url("../assets/images/brochure-p2.jpg") center / cover no-repeat;
  border: 1px solid var(--line);
}

.feature-copy h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.7rem, 3vw, 2.2rem);
}

.feature-copy p {
  margin: 0 0 1.2rem;
  color: var(--ink-soft);
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 1.75rem;
}

.stat {
  border-top: 2px solid var(--accent);
  padding-top: 0.75rem;
}

.stat strong {
  display: block;
  font-family: "Noto Serif SC", serif;
  font-size: 1.6rem;
  line-height: 1.1;
}

.stat span {
  color: var(--muted);
  font-size: 0.85rem;
}

/* ---------- Pattern chips ---------- */
.chip-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.chip {
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--line);
  background: #fff;
  font-size: 0.88rem;
  color: var(--ink-soft);
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.contact-block {
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
}

.contact-block h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.contact-block p {
  margin: 0;
  color: var(--ink-soft);
}

.contact-block a {
  color: var(--accent);
  border-bottom: 1px solid transparent;
}

.contact-block a:hover {
  border-bottom-color: var(--accent);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: rgba(255, 255, 255, 0.78);
  padding: 2.75rem 0 2rem;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-brand .brand-en {
  color: #fff;
}

.footer-brand p {
  margin: 0.65rem 0 0;
  max-width: 22rem;
  font-size: 0.92rem;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  padding-top: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  justify-content: space-between;
  font-size: 0.85rem;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.78);
  border-bottom: 1px solid rgba(255, 255, 255, 0.25);
}

.footer-bottom a:hover {
  color: #fff;
}

/* ---------- Reveal motion ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }

/* ---------- 404 ---------- */
.error-page {
  min-height: calc(100vh - var(--nav-h) - 180px);
  display: grid;
  place-items: center;
  text-align: center;
  padding: 4rem 1.25rem;
}

.error-page h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(3rem, 10vw, 5rem);
}

.error-page p {
  margin: 0 0 1.5rem;
  color: var(--ink-soft);
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .pillars,
  .feature-strip,
  .contact-grid,
  .stat-row {
    grid-template-columns: 1fr;
  }

  .nav-toggle {
    display: inline-block;
  }

  .nav-links {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem 1.25rem 1rem;
    background: rgba(243, 246, 248, 0.98);
    border-bottom: 1px solid var(--line);
  }

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

  .nav-links a {
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--line);
  }

  .nav-links a::after {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .btn:hover { transform: none; }
}