/* ============================================
   锦盛 · 高端无缝壁布
   视觉方向：织造样本册 — 暖亚麻纸感 / 青铜线 / 无圆角
   ============================================ */

:root {
  --paper: #f3efe7;
  --paper-soft: #ebe5d9;
  --ink: #1a1814;
  --panel: #2a2621;
  --bronze: #8c6a3f;
  --bronze-soft: #b8956a;
  --muted: #8a847a;
  --line: #d4cfc4;
  --white: #faf8f4;

  --font-display: "Songti SC", "STSong", "SimSun", Georgia, "Times New Roman", serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;

  --max: 1120px;
  --gutter: clamp(20px, 4vw, 48px);
  --header-h: 64px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

ul {
  list-style: none;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

.container {
  width: min(var(--max), 100% - var(--gutter) * 2);
  margin-inline: auto;
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header-h);
  border-bottom: 1px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
}

.site-header.is-scrolled {
  background: rgba(243, 239, 231, 0.92);
  border-bottom-color: var(--line);
  backdrop-filter: blur(12px);
}

.site-header.is-scrolled .logo,
.site-header.is-scrolled .nav-link,
.site-header.is-scrolled .nav-cta {
  color: var(--ink);
}

.site-header.is-scrolled .nav-cta {
  border-color: var(--ink);
}

.site-header.is-scrolled .nav-cta:hover {
  background: var(--ink);
  color: var(--paper);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  display: flex;
  flex-direction: column;
  gap: 2px;
  color: var(--white);
  transition: color 0.3s ease;
}

.logo-mark {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.18em;
  line-height: 1.1;
}

.logo-sub {
  font-size: 10px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  opacity: 0.72;
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  position: relative;
  font-size: 14px;
  letter-spacing: 0.08em;
  color: rgba(250, 248, 244, 0.88);
  padding: 8px 0;
  transition: color 0.2s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 2px;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.nav-link:hover::after,
.nav-link:focus-visible::after,
.nav-link.is-active::after {
  transform: scaleX(1);
}

.nav-link:focus-visible,
.nav-cta:focus-visible,
.filter-btn:focus-visible,
.btn:focus-visible,
.menu-toggle:focus-visible,
.product-card:focus-visible {
  outline: 2px solid var(--bronze);
  outline-offset: 3px;
}

.nav-cta {
  font-size: 13px;
  letter-spacing: 0.12em;
  padding: 8px 16px;
  border: 1px solid rgba(250, 248, 244, 0.55);
  color: var(--white);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.nav-cta:hover {
  background: var(--white);
  color: var(--ink);
  border-color: var(--white);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  color: var(--white);
}

.site-header.is-scrolled .menu-toggle {
  color: var(--ink);
}

.menu-toggle-bars {
  display: block;
  width: 20px;
  height: 12px;
  position: relative;
}

.menu-toggle-bars::before,
.menu-toggle-bars::after,
.menu-toggle-bars span {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transition: transform 0.25s ease, opacity 0.25s ease, top 0.25s ease;
}

.menu-toggle-bars::before { top: 0; }
.menu-toggle-bars span { top: 5.5px; }
.menu-toggle-bars::after { top: 11px; }

.menu-toggle[aria-expanded="true"] .menu-toggle-bars::before {
  top: 5.5px;
  transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle-bars span {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] .menu-toggle-bars::after {
  top: 5.5px;
  transform: rotate(-45deg);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: flex-end;
  color: var(--white);
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(26, 24, 20, 0.35) 0%, rgba(26, 24, 20, 0.55) 45%, rgba(26, 24, 20, 0.82) 100%),
    linear-gradient(90deg, rgba(26, 24, 20, 0.45) 0%, transparent 55%);
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: calc(var(--header-h) + 40px) 0 72px;
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
  font-size: 12px;
  letter-spacing: 0.32em;
  color: var(--bronze-soft);
}

.hero-eyebrow::before {
  content: "";
  width: 40px;
  height: 1px;
  background: currentColor;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(40px, 7vw, 72px);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: 0.08em;
  max-width: 14em;
}

.hero-lead {
  margin-top: 18px;
  max-width: 28em;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.8;
  color: rgba(250, 248, 244, 0.82);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 36px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 28px;
  font-size: 14px;
  letter-spacing: 0.14em;
  border: 1px solid transparent;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn-primary {
  background: var(--bronze);
  color: var(--white);
  border-color: var(--bronze);
}

.btn-primary:hover {
  background: var(--bronze-soft);
  border-color: var(--bronze-soft);
}

.btn-ghost {
  border-color: rgba(250, 248, 244, 0.55);
  color: var(--white);
}

.btn-ghost:hover {
  background: rgba(250, 248, 244, 0.12);
  border-color: var(--white);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid rgba(250, 248, 244, 0.18);
  max-width: 640px;
}

.hero-stat strong {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--bronze-soft);
  line-height: 1.2;
}

.hero-stat span {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: rgba(250, 248, 244, 0.72);
}

.hero-scroll {
  position: absolute;
  right: var(--gutter);
  bottom: 36px;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: rgba(250, 248, 244, 0.65);
  writing-mode: vertical-rl;
}

.hero-scroll::after {
  content: "";
  width: 1px;
  height: 48px;
  background: linear-gradient(180deg, currentColor, transparent);
}

/* ---------- Section commons ---------- */
.section {
  padding: clamp(72px, 10vw, 120px) 0;
}

.section-label {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 16px;
  color: var(--bronze);
}

.section-label .num {
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.2em;
}

.section-label .en {
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 500;
  letter-spacing: 0.08em;
  line-height: 1.35;
  margin-bottom: 20px;
}

.section-desc {
  max-width: 36em;
  color: var(--muted);
  font-size: 15px;
}

.thread {
  display: block;
  width: 100%;
  height: 12px;
  color: var(--line);
}

.thread path {
  fill: none;
  stroke: currentColor;
  stroke-width: 1;
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}

.about-visual {
  position: relative;
}

.about-visual img {
  width: 100%;
  aspect-ratio: 1 / 1.05;
  object-fit: cover;
}

.about-visual::after {
  content: "";
  position: absolute;
  inset: 16px -16px -16px 16px;
  border: 1px solid var(--bronze);
  z-index: -1;
  pointer-events: none;
}

.about-copy p + p {
  margin-top: 16px;
}

.about-copy .lead {
  font-size: 17px;
  color: var(--ink);
}

.about-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.about-point strong {
  display: block;
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 500;
  color: var(--bronze);
  line-height: 1.2;
}

.about-point span {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- Products ---------- */
.products {
  background: var(--white);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 40px;
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-btn {
  min-height: 40px;
  padding: 0 18px;
  font-size: 13px;
  letter-spacing: 0.1em;
  border: 1px solid var(--line);
  color: var(--muted);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.filter-btn:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.filter-btn.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.product-card {
  display: block;
  text-align: left;
  border: 1px solid var(--line);
  background: var(--paper);
  transition: border-color 0.2s ease, transform 0.25s ease;
}

.product-card:hover {
  border-color: var(--bronze);
  transform: translateY(-3px);
}

.product-card.is-hidden {
  display: none;
}

.product-card img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
}

.product-body {
  padding: 18px 18px 22px;
  border-top: 1px solid var(--line);
}

.product-tag {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--bronze);
}

.product-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.product-desc {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

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

.advantage-item {
  background: var(--paper);
  padding: 32px 24px 36px;
  min-height: 100%;
}

.advantage-num {
  display: block;
  margin-bottom: 28px;
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--bronze);
}

.advantage-item h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

.advantage-item p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.75;
}

/* ---------- Cooperation ---------- */
.cooperation {
  background: var(--panel);
  color: var(--white);
}

.cooperation .section-label {
  color: var(--bronze-soft);
}

.cooperation .section-desc {
  color: rgba(250, 248, 244, 0.68);
}

.coop-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(28px, 5vw, 64px);
  align-items: stretch;
}

.coop-visual img {
  width: 100%;
  height: 100%;
  min-height: 320px;
  object-fit: cover;
}

.coop-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 28px;
}

.coop-card {
  border: 1px solid rgba(250, 248, 244, 0.16);
  padding: 24px 22px;
  background: rgba(250, 248, 244, 0.03);
}

.coop-card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
  color: var(--bronze-soft);
}

.coop-card li {
  position: relative;
  padding-left: 14px;
  margin-bottom: 8px;
  font-size: 14px;
  color: rgba(250, 248, 244, 0.78);
}

.coop-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 5px;
  height: 1px;
  background: var(--bronze-soft);
}

.coop-support {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 16px;
}

.support-item {
  border-top: 1px solid rgba(250, 248, 244, 0.16);
  padding-top: 14px;
}

.support-item h4 {
  font-size: 14px;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
  color: var(--white);
}

.support-item p {
  font-size: 13px;
  color: rgba(250, 248, 244, 0.62);
  line-height: 1.6;
}

.coop-cta {
  margin-top: 32px;
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(28px, 5vw, 64px);
}

.contact-list {
  display: grid;
  gap: 22px;
  margin-top: 8px;
}

.contact-item h3 {
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--bronze);
  margin-bottom: 8px;
}

.contact-item p,
.contact-item a {
  font-size: 16px;
  line-height: 1.6;
}

.contact-item a:hover {
  color: var(--bronze);
}

.contact-note {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
}

.contact-form {
  border: 1px solid var(--line);
  background: var(--white);
  padding: clamp(24px, 3vw, 36px);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-field {
  margin-bottom: 16px;
}

.form-field label {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  min-height: 46px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  background: var(--paper);
  transition: border-color 0.2s ease;
}

.form-field textarea {
  min-height: 120px;
  resize: vertical;
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--bronze);
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 8px;
}

.form-hint {
  font-size: 12px;
  color: var(--muted);
}

.form-success {
  display: none;
  margin-top: 16px;
  padding: 14px 16px;
  border: 1px solid var(--bronze);
  background: rgba(140, 106, 63, 0.08);
  color: var(--ink);
  font-size: 14px;
}

.form-success.is-visible {
  display: block;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: rgba(250, 248, 244, 0.72);
  padding: 56px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.1fr;
  gap: 32px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(250, 248, 244, 0.12);
}

.footer-brand .logo-mark {
  color: var(--white);
  margin-bottom: 4px;
}

.footer-brand p {
  margin-top: 14px;
  max-width: 22em;
  font-size: 13px;
  line-height: 1.7;
}

.footer-col h4 {
  color: var(--white);
  font-size: 13px;
  letter-spacing: 0.16em;
  margin-bottom: 16px;
}

.footer-col a,
.footer-col li {
  display: block;
  margin-bottom: 10px;
  font-size: 13px;
}

.footer-col a:hover {
  color: var(--bronze-soft);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding-top: 22px;
  font-size: 12px;
  color: rgba(250, 248, 244, 0.45);
}

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

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

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .about-grid,
  .coop-layout,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .about-visual::after {
    inset: 12px -12px -12px 12px;
  }

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

  .advantage-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero-scroll {
    display: none;
  }
}

@media (max-width: 720px) {
  .menu-toggle {
    display: inline-flex;
  }

  .nav {
    position: fixed;
    inset: var(--header-h) 0 auto;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px var(--gutter) 20px;
    background: rgba(243, 239, 231, 0.98);
    border-bottom: 1px solid var(--line);
  }

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

  .nav-link,
  .nav-cta {
    color: var(--ink) !important;
    border: none;
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
  }

  .nav-cta {
    border-bottom: none;
    margin-top: 8px;
    text-align: center;
    border: 1px solid var(--ink);
  }

  .hero-stats,
  .about-points,
  .coop-cards,
  .coop-support,
  .form-row {
    grid-template-columns: 1fr;
  }

  .product-grid,
  .advantage-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}