/* =====================================================
   必博中国 · 草原索引系统
   /assets/site.css
   ===================================================== */

/* ---------- 0. CSS 变量 ---------- */
:root {
  --grass-blue: #1E6FBA;
  --grass-blue-dark: #155A99;
  --grass-blue-soft: #E8F1FA;
  --cloud-white: #F9F9F7;
  --sunset-orange: #F4A261;
  --dune-gold: #D9A066;
  --ink-core: #1A2B3C;
  --grass-green: #3C8D5A;
  --night-blue: #102A43;
  --mist-gray: #E2E8F0;
  --paper-warm: #F7F1E8;
  --white: #FFFFFF;

  --font-display: "Playfair Display", "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-body: "Inter", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;

  --radius: 8px;
  --max-w: 1200px;
  --header-min-h: 76px;
  --shadow-card: 0 8px 24px rgba(16, 42, 67, 0.08);
  --shadow-hover: 0 16px 40px rgba(16, 42, 67, 0.14);
}

/* ---------- 1. Reset & 基础 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--ink-core);
  background: var(--cloud-white);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.2;
  color: var(--ink-core);
}

p {
  color: inherit;
}

a {
  color: var(--grass-blue);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover,
a:focus {
  color: var(--sunset-orange);
}

ul, ol {
  list-style: none;
}

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

::selection {
  background: var(--sunset-orange);
  color: var(--ink-core);
}

:focus-visible {
  outline: 3px solid var(--sunset-orange);
  outline-offset: 2px;
  border-radius: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- 2. 工具类 ---------- */
.container {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 48px);
}

.main-content {
  min-height: 60vh;
  padding-bottom: 80px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 200;
  padding: 12px 24px;
  background: var(--sunset-orange);
  border-radius: 0 0 8px 8px;
  color: var(--ink-core);
  font-weight: 700;
  font-size: 0.9rem;
  transition: top 0.25s ease;
}

.skip-link:focus {
  top: 0;
}

.no-scroll {
  overflow: hidden;
}

/* ---------- 3. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: 2px solid var(--grass-blue);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

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

.btn-primary:hover {
  background: var(--grass-blue-dark);
  border-color: var(--grass-blue-dark);
  color: var(--white);
  box-shadow: 0 8px 20px rgba(30, 111, 186, 0.32);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  background: var(--grass-blue);
  border-color: var(--grass-blue);
  color: var(--white);
  transform: translateY(-2px);
}

/* ---------- 4. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--dune-gold);
  padding-block: 20px 0;
}

.breadcrumbs a {
  color: var(--grass-blue);
}

.breadcrumbs .crumb-sep {
  color: var(--dune-gold);
  opacity: 0.6;
  padding-inline: 2px;
}

.breadcrumbs .crumb-current {
  font-weight: 600;
  color: var(--ink-core);
}

/* ---------- 5. 栅格 ---------- */
.grid {
  display: grid;
  gap: 24px;
}

.grid--2,
.grid--3 {
  grid-template-columns: 1fr;
}

@media (min-width: 720px) {
  .grid--2,
  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1080px) {
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- 6. 区域与标题 ---------- */
.section {
  padding-block: 64px;
}

.section--paper {
  background: var(--paper-warm);
}

.section--grass {
  background: linear-gradient(180deg, var(--paper-warm), var(--cloud-white));
}

.section-head {
  max-width: 720px;
  margin-bottom: 40px;
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--grass-blue);
  margin-bottom: 10px;
  text-transform: uppercase;
}

.section-kicker::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--sunset-orange);
  display: inline-block;
  flex-shrink: 0;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.6rem);
  margin-bottom: 12px;
  letter-spacing: 0.01em;
}

.section-desc {
  font-size: 1rem;
  opacity: 0.78;
  margin-top: 8px;
}

/* ---------- 7. 卡片 ---------- */
.card {
  position: relative;
  background: var(--white);
  border: 1px solid var(--mist-gray);
  border-left: 4px solid var(--grass-blue);
  border-radius: var(--radius);
  padding: 24px;
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.card--warm {
  background: var(--paper-warm);
  border-left-color: var(--sunset-orange);
}

.card-title {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.card-desc {
  font-size: 0.95rem;
  opacity: 0.78;
  margin-bottom: 12px;
}

.card-tag {
  position: absolute;
  top: 14px;
  right: 14px;
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--paper-warm);
  color: var(--dune-gold);
  border: 1px solid var(--dune-gold);
  padding: 3px 10px;
  border-radius: 100px;
}

/* ---------- 8. 标签 ---------- */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--paper-warm);
  border: 1px solid var(--dune-gold);
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-core);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.tag:hover {
  background: var(--sunset-orange);
  border-color: var(--sunset-orange);
  color: var(--white);
}

.tag.is-active {
  background: var(--grass-blue);
  border-color: var(--grass-blue);
  color: var(--white);
}

/* ---------- 9. 折叠索引组 ---------- */
.accordion {
  border-top: 1px solid var(--mist-gray);
  max-width: 820px;
}

.accordion-item {
  border-bottom: 1px solid var(--mist-gray);
}

.accordion-toggle {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 20px 4px;
  background: transparent;
  border: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink-core);
  text-align: left;
  cursor: pointer;
  transition: color 0.2s ease, background 0.2s ease;
}

.accordion-toggle:hover,
.accordion-item.is-open .accordion-toggle {
  color: var(--grass-blue);
}

.accordion-toggle:hover .accordion-index {
  background: var(--sunset-orange);
  color: var(--white);
}

.accordion-index {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--dune-gold);
  border-radius: 50%;
  font-family: var(--font-display);
  font-size: 0.75rem;
  color: var(--dune-gold);
  transition: background 0.2s ease, color 0.2s ease;
}

.accordion-arrow {
  margin-left: auto;
  font-size: 1.2rem;
  line-height: 1;
  color: var(--sunset-orange);
  transition: transform 0.3s ease;
}

.accordion-item.is-open .accordion-arrow {
  transform: rotate(180deg);
}

.accordion-panel {
  max-height: 0;
  overflow: hidden;
  visibility: hidden;
  transition: max-height 0.35s ease, visibility 0.35s;
}

.accordion-item.is-open .accordion-panel {
  max-height: 40rem;
  visibility: visible;
}

.accordion-inner {
  padding: 0 4px 20px 44px;
  font-size: 0.95rem;
  line-height: 1.7;
  opacity: 0.82;
  max-width: 720px;
}

/* ---------- 10. 首屏框景 ---------- */
.frame-view {
  position: relative;
  max-width: 1060px;
  margin: 40px auto;
  padding: clamp(28px, 6vw, 64px);
  background: linear-gradient(145deg, var(--paper-warm), var(--white));
  border: 2px solid var(--ink-core);
  border-radius: 2px;
  box-shadow: 10px 10px 0 var(--dune-gold);
}

.frame-view::before {
  content: "";
  position: absolute;
  inset-inline: 14px;
  bottom: 0;
  height: 5px;
  background: repeating-linear-gradient(
    90deg,
    var(--dune-gold) 0 2px,
    transparent 2px 14px
  );
  opacity: 0.5;
}

.frame-view::after {
  content: "●";
  position: absolute;
  top: 10px;
  right: 14px;
  color: var(--sunset-orange);
  font-size: 0.8rem;
}

.frame-corner {
  position: absolute;
  width: 16px;
  height: 16px;
  border-color: var(--sunset-orange);
  border-style: solid;
}

.frame-corner--tl {
  top: -2px;
  left: -2px;
  border-width: 3px 0 0 3px;
}

.frame-corner--tr {
  top: -2px;
  right: -2px;
  border-width: 3px 3px 0 0;
}

.frame-corner--bl {
  bottom: -2px;
  left: -2px;
  border-width: 0 0 3px 3px;
}

.frame-corner--br {
  bottom: -2px;
  right: -2px;
  border-width: 0 3px 3px 0;
}

.frame-title {
  font-size: clamp(2rem, 5vw, 4.2rem);
  line-height: 1.15;
  margin-bottom: 16px;
}

.frame-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  font-size: 0.85rem;
  color: var(--dune-gold);
  letter-spacing: 0.08em;
  margin-bottom: 20px;
}

.frame-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 11. 图片容器基础 ---------- */
.img-panel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--mist-gray);
  border-radius: 4px;
  background: var(--paper-warm);
}

.img-panel::after {
  content: "";
  display: block;
  padding-top: 62.5%;
}

.img-panel img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.img-panel:hover img {
  transform: scale(1.02);
}

.img-panel--wide::after {
  padding-top: 56.25%;
}

.img-panel--tall::after {
  padding-top: 125%;
}

.img-panel--square::after {
  padding-top: 100%;
}

.img-panel-frame {
  border: 6px solid var(--white);
  box-shadow: 0 12px 30px rgba(16, 42, 67, 0.15);
}

/* ---------- 12. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background:
    radial-gradient(ellipse at 85% 10%, rgba(255, 255, 255, 0.12), transparent 50%),
    radial-gradient(ellipse at 5% 100%, rgba(244, 162, 97, 0.16), transparent 45%),
    linear-gradient(135deg, #0B2B4A 0%, var(--grass-blue) 45%, #2E8BC0 100%);
  border-bottom: 3px solid var(--sunset-orange);
}

.site-header::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: 4px;
  background: repeating-linear-gradient(
    135deg,
    var(--dune-gold) 0 4px,
    transparent 4px 8px,
    var(--sunset-orange) 8px 12px,
    transparent 12px 16px
  );
  opacity: 0.5;
  pointer-events: none;
}

.notice-bar {
  position: relative;
  background: rgba(7, 20, 33, 0.88);
  color: var(--cloud-white);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.notice-toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding: 10px clamp(16px, 4vw, 48px);
  background: transparent;
  border: 0;
  color: inherit;
  font-family: var(--font-body);
  font-size: 0.86rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  text-align: left;
}

.notice-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sunset-orange);
  flex-shrink: 0;
  box-shadow: 0 0 0 3px rgba(244, 162, 97, 0.25);
}

.notice-label {
  color: var(--cloud-white);
}

.notice-arrow {
  margin-left: auto;
  color: var(--sunset-orange);
  font-size: 1.1rem;
  line-height: 1;
  transition: transform 0.3s ease;
}

.notice-bar.is-open .notice-arrow {
  transform: rotate(180deg);
}

.notice-panel {
  max-height: 0;
  overflow: hidden;
  visibility: hidden;
  transition: max-height 0.35s ease, visibility 0.35s;
}

.notice-bar.is-open .notice-panel {
  max-height: 200px;
  visibility: visible;
}

.notice-content {
  max-width: var(--max-w);
  margin-inline: auto;
  padding: 0 clamp(16px, 4vw, 48px) 14px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.88);
}

.notice-text {
  flex: 1 1 300px;
}

.notice-link {
  color: var(--sunset-orange);
  font-weight: 700;
  white-space: nowrap;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.notice-link:hover {
  color: var(--dune-gold);
}

.header-inner {
  max-width: var(--max-w);
  margin-inline: auto;
  min-height: var(--header-min-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px clamp(16px, 4vw, 48px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--white);
  text-decoration: none;
  flex-shrink: 0;
  line-height: 1.2;
}

.brand:hover {
  color: var(--white);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: var(--sunset-orange);
  border: 2px solid rgba(255, 255, 255, 0.9);
  border-radius: 50% 50% 2px 50%;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--ink-core);
  line-height: 1;
  box-shadow: 2px 2px 0 var(--dune-gold);
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  color: var(--white);
}

.brand-cn {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.8);
  border-left: 1px solid rgba(255, 255, 255, 0.4);
  padding-left: 8px;
  margin-left: 6px;
}

.nav-toggle {
  display: none;
  position: relative;
  z-index: 30;
  flex-direction: column;
  justify-content: center;
  align-items: flex-end;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 8px;
  cursor: pointer;
  flex-shrink: 0;
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.25);
}

.nav-toggle-line {
  width: 22px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav {
  flex-shrink: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px 6px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 10px;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: 10px 14px;
  color: rgba(255, 255, 255, 0.92);
  font-size: 0.95rem;
  font-weight: 500;
  border-bottom: 3px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.nav-link:hover,
.nav-link:focus {
  color: var(--sunset-orange);
  background: rgba(255, 255, 255, 0.08);
}

.nav-link[aria-current="page"] {
  color: var(--sunset-orange);
  border-bottom-color: var(--sunset-orange);
  font-weight: 700;
}

.nav-num {
  font-family: var(--font-display);
  font-size: 0.72rem;
  color: var(--sunset-orange);
  margin-right: 6px;
  font-weight: 700;
  opacity: 0.9;
}

@media (max-width: 991px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: min(340px, 88vw);
    height: 100vh;
    height: 100dvh;
    padding: 90px 24px 32px;
    background: linear-gradient(160deg, #0B2B4A 0%, #155A99 100%);
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 0.35s ease, visibility 0.35s;
    overflow-y: auto;
    z-index: 20;
    box-shadow: -16px 0 40px rgba(7, 20, 33, 0.35);
  }

  .site-nav[data-open] {
    transform: translateX(0);
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 0;
    background: transparent;
    border: 0;
    border-radius: 0;
  }

  .nav-link {
    padding: 14px 16px;
    font-size: 1.04rem;
    border-left: 4px solid transparent;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.92);
  }

  .nav-link:hover,
  .nav-link:focus {
    border-left-color: var(--sunset-orange);
    background: rgba(255, 255, 255, 0.06);
    border-bottom-color: rgba(255, 255, 255, 0.1);
  }

  .nav-link[aria-current="page"] {
    background: rgba(244, 162, 97, 0.1);
    border-left-color: var(--sunset-orange);
    border-bottom-color: rgba(255, 255, 255, 0.1);
  }

  .nav-num {
    font-size: 0.8rem;
  }
}

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative;
  background: linear-gradient(180deg, var(--night-blue) 0%, #040F1C 100%);
  color: rgba(226, 232, 240, 0.8);
  border-top: 4px solid var(--sunset-orange);
  margin-top: 80px;
}

.site-footer::before {
  content: "";
  display: block;
  height: 6px;
  background: repeating-linear-gradient(
    90deg,
    var(--sunset-orange) 0 8px,
    transparent 8px 12px,
    var(--dune-gold) 12px 20px,
    transparent 20px 24px
  );
}

.footer-inner {
  max-width: var(--max-w);
  margin-inline: auto;
  padding: 60px clamp(16px, 4vw, 48px) 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr 1.2fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-brand-col,
.footer-col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-brand-name {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--white);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-brand-name::before {
  content: "";
  width: 18px;
  height: 3px;
  background: var(--sunset-orange);
  display: inline-block;
}

.footer-brand-desc {
  font-size: 0.94rem;
  line-height: 1.75;
  color: rgba(226, 232, 240, 0.68);
  max-width: 320px;
}

.footer-trust {
  margin-top: 14px;
  font-size: 0.84rem;
  color: var(--sunset-orange);
  line-height: 1.6;
  border-left: 2px solid var(--sunset-orange);
  padding-left: 12px;
  max-width: 320px;
}

.footer-col-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  letter-spacing: 0.05em;
}

.footer-links {
  display: grid;
  gap: 10px;
}

.footer-links a {
  color: rgba(226, 232, 240, 0.78);
  font-size: 0.92rem;
  transition: color 0.2s ease, transform 0.2s ease;
  display: inline-block;
}

.footer-links a:hover {
  color: var(--sunset-orange);
  transform: translateX(4px);
}

.footer-contact {
  display: grid;
  gap: 12px;
  font-size: 0.9rem;
  line-height: 1.5;
  color: rgba(226, 232, 240, 0.8);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.footer-legal a {
  color: rgba(226, 232, 240, 0.75);
  font-size: 0.82rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 6px 12px;
  border-radius: 4px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.footer-legal a:hover {
  color: var(--sunset-orange);
  border-color: var(--sunset-orange);
}

.footer-hint {
  font-size: 0.82rem;
  color: rgba(226, 232, 240, 0.5);
  margin-top: 16px;
  border-top: 1px dashed rgba(226, 232, 240, 0.2);
  padding-top: 12px;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 24px 4px;
  font-size: 0.84rem;
  color: rgba(226, 232, 240, 0.5);
}

.footer-icp {
  letter-spacing: 0.03em;
}

.footer-copy {
  letter-spacing: 0.02em;
}

@media (max-width: 991px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px 24px;
  }
}

@media (max-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .section {
    padding-block: 48px;
  }
}

/* ---------- 14. 装饰线 ---------- */
.steppe-line {
  height: 4px;
  border: 0;
  margin: 32px 0;
  background: repeating-linear-gradient(
    90deg,
    var(--sunset-orange) 0 12px,
    var(--dune-gold) 12px 20px,
    transparent 20px 32px
  );
  opacity: 0.7;
}

.steppe-diamonds {
  height: 10px;
  background: repeating-linear-gradient(
    135deg,
    var(--dune-gold) 0 4px,
    transparent 4px 8px,
    var(--sunset-orange) 8px 12px,
    transparent 12px 16px
  );
  opacity: 0.45;
  margin: 20px 0;
}