/* ==========================================================================
   凯运赛事 · Site Kit 共享样式
   技术蓝图网格 / 框架式导航 / 深蓝基座 / 活力橙 / 草原绿 / 数据金
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  --ky-navy: #0A1E3F;
  --ky-navy-2: #0D3B66;
  --ky-orange: #FF6B35;
  --ky-green: #2E8B57;
  --ky-gold: #FFD700;
  --ky-white: #F5F7FA;
  --ky-grid: #E9ECF3;
  --ky-brick: #78290F;

  --ky-max: 1440px;
  --ky-gutter: clamp(20px, 4vw, 56px);

  --ky-radius-lg: 28px;
  --ky-radius-md: 18px;
  --ky-radius-pill: 999px;

  --ky-font-head: Impact, "Noto Sans SC Black", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --ky-font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --ky-font-data: "JetBrains Mono", "Roboto Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --ky-font-index: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;

  --ky-shadow-card: 0 8px 30px rgba(10, 30, 63, 0.06);
  --ky-shadow-lift: 0 16px 40px rgba(10, 30, 63, 0.12);
}

/* ---------- 2. Reset 与基础排版 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--ky-font-body);
  font-size: 16px;
  line-height: 1.75;
  color: rgba(10, 30, 63, 0.88);
  background: var(--ky-white);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

@supports not (overflow: clip) {
  body {
    overflow-x: hidden;
  }
}

main {
  display: block;
}

#main-content {
  display: block;
  min-height: 70vh;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--ky-font-head);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ky-navy);
}

p {
  margin: 0;
}

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

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

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

figure {
  margin: 0;
}

button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

::selection {
  background: var(--ky-orange);
  color: var(--ky-navy);
}

:focus-visible {
  outline: 3px solid rgba(255, 215, 0, 0.85);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- 3. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: 20px;
  z-index: 5000;
  padding: 12px 22px;
  background: var(--ky-orange);
  color: var(--ky-navy);
  font-weight: 700;
  font-size: 14px;
  border-radius: var(--ky-radius-pill);
  box-shadow: 0 8px 24px rgba(255, 107, 53, 0.4);
  transition: top 0.25s ease;
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 14px;
}

/* ---------- 4. 框架式头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background:
    linear-gradient(rgba(233, 236, 243, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(233, 236, 243, 0.045) 1px, transparent 1px),
    var(--ky-navy);
  background-size: 44px 44px, 44px 44px, auto;
  color: var(--ky-white);
  box-shadow: 0 6px 30px rgba(0, 0, 0, 0.28);
}

.progress-track {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 30;
  background: linear-gradient(90deg, var(--ky-orange) 0%, var(--ky-gold) 48%, var(--ky-green) 100%);
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

.header-topline {
  background: rgba(13, 59, 102, 0.6);
  border-bottom: 1px solid rgba(233, 236, 243, 0.1);
}

.header-topline-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  max-width: var(--ky-max);
  margin: 0 auto;
  padding: 7px var(--ky-gutter);
  font-family: var(--ky-font-data);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(245, 247, 250, 0.65);
  white-space: nowrap;
  overflow: hidden;
}

.hline-item {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
}

.hline-seq {
  color: rgba(255, 215, 0, 0.85);
}

.hline-mid {
  color: rgba(245, 247, 250, 0.62);
}

.hline-region {
  color: rgba(245, 247, 250, 0.42);
}

.hline-spacer {
  flex: 1 1 auto;
}

.hline-strong {
  padding: 3px 14px;
  background: var(--ky-gold);
  color: var(--ky-navy);
  border-radius: var(--ky-radius-pill);
  font-weight: 700;
  letter-spacing: 0.06em;
  transition: background 0.2s ease, transform 0.2s ease;
}

.hline-strong:hover {
  background: #fff4b0;
  transform: translateY(-1px);
}

.header-mainbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: var(--ky-max);
  margin: 0 auto;
  padding: 12px var(--ky-gutter);
}

/* ---------- 5. 品牌 ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand-badge {
  display: grid;
  place-items: center;
  position: relative;
  width: 46px;
  height: 46px;
  border-radius: 15px;
  background: linear-gradient(135deg, var(--ky-orange) 0%, var(--ky-gold) 100%);
  box-shadow: 0 6px 20px rgba(255, 107, 53, 0.35);
}

.brand-badge::after {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1.5px solid rgba(10, 30, 63, 0.35);
  border-radius: 10px;
  pointer-events: none;
}

.brand-badge-core {
  font-family: var(--ky-font-head);
  font-size: 23px;
  font-weight: 900;
  line-height: 1;
  color: var(--ky-navy);
  position: relative;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-family: var(--ky-font-head);
  font-size: 21px;
  font-weight: 900;
  letter-spacing: 0.05em;
  color: var(--ky-white);
}

.brand-sub {
  margin-top: 3px;
  font-family: var(--ky-font-data);
  font-size: 10px;
  letter-spacing: 0.32em;
  color: var(--ky-gold);
}

/* ---------- 6. 导航 ---------- */
.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-item {
  position: relative;
  padding: 10px 15px;
  font-size: 15px;
  font-weight: 500;
  color: rgba(245, 247, 250, 0.86);
  border-radius: var(--ky-radius-pill);
  white-space: nowrap;
  transition: background 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
}

.nav-item:hover {
  background: rgba(255, 107, 53, 0.16);
  color: var(--ky-white);
}

.nav-item[aria-current="page"] {
  background: var(--ky-orange);
  color: var(--ky-navy);
  font-weight: 700;
  box-shadow: 0 4px 18px rgba(255, 107, 53, 0.35);
}

.nav-item-accent {
  margin-left: 8px;
  border: 1.5px solid rgba(255, 215, 0, 0.5);
  color: var(--ky-gold);
}

.nav-item-accent:hover {
  background: rgba(255, 215, 0, 0.14);
  border-color: var(--ky-gold);
  color: var(--ky-gold);
}

.nav-item-accent[aria-current="page"] {
  background: var(--ky-gold);
  border-color: var(--ky-gold);
  color: var(--ky-navy);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  border: 1.5px solid rgba(233, 236, 243, 0.25);
  background: rgba(13, 59, 102, 0.55);
  transition: border-color 0.25s ease, background 0.25s ease;
}

.nav-toggle:hover {
  border-color: rgba(255, 215, 0, 0.6);
  background: rgba(255, 215, 0, 0.08);
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--ky-white);
  transition: transform 0.3s ease, opacity 0.3s ease, background 0.3s ease;
}

.nav-toggle[data-open] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background: var(--ky-gold);
}

.nav-toggle[data-open] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[data-open] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  background: var(--ky-gold);
}

@media (max-width: 960px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    padding: 14px var(--ky-gutter) 22px;
    background:
      linear-gradient(rgba(233, 236, 243, 0.05) 1px, transparent 1px),
      linear-gradient(90deg, rgba(233, 236, 243, 0.05) 1px, transparent 1px),
      var(--ky-navy);
    background-size: 40px 40px, 40px 40px, auto;
    border-bottom: 1px solid rgba(233, 236, 243, 0.14);
    box-shadow: 0 30px 50px rgba(0, 0, 0, 0.35);
  }

  .site-nav[data-open] {
    display: flex;
  }

  .nav-item {
    padding: 13px 18px;
    font-size: 16px;
    border-radius: 14px;
  }

  .nav-item-accent {
    margin-left: 0;
    text-align: center;
  }
}

/* ---------- 7. 页面容器 ---------- */
.page-wrap {
  width: 100%;
  max-width: var(--ky-max);
  margin: 0 auto;
  padding: clamp(32px, 5vw, 64px) var(--ky-gutter);
}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 4px 0 22px;
  font-size: 13px;
  color: rgba(10, 30, 63, 0.55);
}

.breadcrumb-link {
  color: rgba(10, 30, 63, 0.78);
  transition: color 0.2s ease;
}

.breadcrumb-link:hover {
  color: var(--ky-orange);
}

.breadcrumb-sep {
  color: var(--ky-orange);
  font-family: var(--ky-font-data);
}

.breadcrumb-current {
  color: var(--ky-navy);
  font-weight: 600;
}

/* ---------- 9. 章节骨架 ---------- */
.section-block {
  position: relative;
  padding: clamp(48px, 7vw, 96px) 0;
}

.section-index {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  font-family: var(--ky-font-data);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ky-orange);
}

.section-index::before {
  content: "";
  width: 30px;
  height: 2px;
  border-radius: 2px;
  background: var(--ky-orange);
}

.section-title {
  max-width: 900px;
  font-family: var(--ky-font-head);
  font-size: clamp(34px, 5vw, 62px);
  line-height: 1.08;
  color: var(--ky-navy);
  margin-bottom: 14px;
}

.section-lead {
  max-width: 640px;
  font-size: 17px;
  line-height: 1.8;
  color: rgba(10, 30, 63, 0.72);
}

.is-dark {
  background: var(--ky-navy);
  color: var(--ky-white);
}

.is-dark .section-title {
  color: var(--ky-white);
}

.is-dark .section-index {
  color: var(--ky-gold);
}

.is-dark .section-index::before {
  background: var(--ky-gold);
}

.is-dark .section-lead {
  color: rgba(245, 247, 250, 0.76);
}

.is-dark .btn-ghost {
  border-color: rgba(245, 247, 250, 0.45);
  color: var(--ky-white);
}

.is-dark .btn-ghost:hover {
  background: rgba(245, 247, 250, 0.1);
  border-color: var(--ky-white);
}

.is-dark .data-num {
  color: var(--ky-gold);
}

/* ---------- 10. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 30px;
  border-radius: var(--ky-radius-pill);
  font-family: var(--ky-font-body);
  font-size: 16px;
  font-weight: 700;
  white-space: nowrap;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn-primary {
  background: var(--ky-orange);
  color: var(--ky-navy);
  box-shadow: 0 8px 24px rgba(255, 107, 53, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(255, 107, 53, 0.5);
}

.btn-ghost {
  border: 1.5px solid rgba(10, 30, 63, 0.3);
  color: var(--ky-navy);
  background: transparent;
}

.btn-ghost:hover {
  border-color: var(--ky-navy);
  background: rgba(10, 30, 63, 0.05);
}

.btn-light {
  background: var(--ky-white);
  color: var(--ky-navy);
  box-shadow: 0 8px 24px rgba(245, 247, 250, 0.18);
}

.btn-light:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(245, 247, 250, 0.28);
}

/* ---------- 11. 面板与卡片 ---------- */
.panel {
  padding: clamp(24px, 3vw, 40px);
  border: 1px solid var(--ky-grid);
  border-radius: var(--ky-radius-lg);
  background: var(--ky-white);
  box-shadow: var(--ky-shadow-card);
}

.panel-card {
  padding: 28px;
  border: 1px solid var(--ky-grid);
  border-radius: var(--ky-radius-lg);
  background: var(--ky-white);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.panel-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 107, 53, 0.4);
  box-shadow: var(--ky-shadow-lift);
}

.panel-dark {
  background: var(--ky-navy-2);
  border-color: rgba(233, 236, 243, 0.16);
  color: rgba(245, 247, 250, 0.82);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.22);
}

/* ---------- 12. 标签与数据数字 ---------- */
.tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--ky-radius-pill);
  font-family: var(--ky-font-data);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.tag-pill-orange {
  background: rgba(255, 107, 53, 0.16);
  color: #C24E1F;
}

.tag-pill-green {
  background: rgba(46, 139, 87, 0.16);
  color: #1E6B41;
}

.tag-pill-gold {
  background: rgba(255, 215, 0, 0.22);
  color: #7A6100;
}

.is-dark .tag-pill-orange {
  background: rgba(255, 107, 53, 0.24);
  color: #FFB08D;
}

.is-dark .tag-pill-green {
  background: rgba(46, 139, 87, 0.28);
  color: #7AC79E;
}

.is-dark .tag-pill-gold {
  background: rgba(255, 215, 0, 0.2);
  color: var(--ky-gold);
}

.data-num {
  font-family: var(--ky-font-data);
  font-size: clamp(28px, 4.5vw, 52px);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--ky-navy);
  font-variant-numeric: tabular-nums;
}

.data-num.is-gold {
  color: #967D00;
}

/* ---------- 13. 图片框架 ---------- */
.img-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--ky-radius-lg);
  background: var(--ky-grid);
}

.img-frame::before {
  content: "IMAGE · KYS-2025";
  position: absolute;
  inset: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  font-family: var(--ky-font-data);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3em;
  color: rgba(10, 30, 63, 0.45);
  background:
    repeating-linear-gradient(45deg, rgba(255, 255, 255, 0.45) 0 8px, transparent 8px 16px),
    var(--ky-grid);
}

.img-frame::after {
  content: "";
  position: absolute;
  top: 12px;
  left: 12px;
  width: 28px;
  height: 28px;
  border-top: 2px solid rgba(255, 107, 53, 0.55);
  border-left: 2px solid rgba(255, 107, 53, 0.55);
  border-top-left-radius: 8px;
  z-index: 3;
  pointer-events: none;
}

.img-frame img {
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.img-frame:hover img {
  transform: scale(1.03);
}

.img-frame-wide {
  aspect-ratio: 16 / 9;
}

.img-frame-square {
  aspect-ratio: 1 / 1;
}

/* ---------- 14. 手风琴 ---------- */
.accordion {
  overflow: hidden;
  border: 1px solid var(--ky-grid);
  border-radius: var(--ky-radius-md);
  background: var(--ky-white);
  box-shadow: 0 4px 20px rgba(10, 30, 63, 0.05);
}

.accordion + .accordion {
  margin-top: 14px;
}

.accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: 100%;
  padding: 20px 24px;
  text-align: left;
  font-family: var(--ky-font-body);
  font-size: 17px;
  font-weight: 700;
  color: var(--ky-navy);
  border: none;
  background: transparent;
  cursor: pointer;
  transition: background 0.2s ease;
}

.accordion-trigger:hover {
  background: rgba(233, 236, 243, 0.45);
}

.accordion-trigger::after {
  content: "+";
  flex-shrink: 0;
  font-family: var(--ky-font-data);
  font-size: 24px;
  line-height: 1;
  color: var(--ky-orange);
  transition: transform 0.3s ease, color 0.3s ease;
}

.accordion-trigger[aria-expanded="true"]::after {
  transform: rotate(45deg);
  color: var(--ky-green);
}

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

.accordion-panel-inner {
  max-width: 720px;
  padding: 0 24px 22px;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(10, 30, 63, 0.75);
}

/* ---------- 15. 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 600;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border: 2px solid rgba(255, 215, 0, 0.55);
  border-radius: 50%;
  background: var(--ky-navy);
  color: var(--ky-gold);
  font-size: 20px;
  line-height: 1;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease, background 0.3s ease, color 0.3s ease;
}

.back-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-top:hover {
  background: var(--ky-orange);
  border-color: var(--ky-orange);
  color: var(--ky-navy);
}

/* ---------- 16. 页脚 ---------- */
.site-footer {
  position: relative;
  background:
    linear-gradient(rgba(233, 236, 243, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(233, 236, 243, 0.04) 1px, transparent 1px),
    var(--ky-navy);
  background-size: 44px 44px, 44px 44px, auto;
  color: var(--ky-white);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--ky-orange) 0%, var(--ky-gold) 48%, var(--ky-green) 100%);
  z-index: 1;
}

.site-footer::after {
  content: "";
  position: absolute;
  right: 14px;
  bottom: 14px;
  width: 24px;
  height: 24px;
  border-right: 2px solid rgba(255, 215, 0, 0.35);
  border-bottom: 2px solid rgba(255, 215, 0, 0.35);
  border-bottom-right-radius: 8px;
  pointer-events: none;
  z-index: 1;
}

.footer-frame {
  max-width: var(--ky-max);
  margin: 0 auto;
  padding: 56px var(--ky-gutter) 28px;
}

.footer-cols {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1.4fr;
  gap: 44px;
}

.footer-about {
  max-width: 360px;
}

.footer-brand-badge {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--ky-orange) 0%, var(--ky-gold) 100%);
  color: var(--ky-navy);
  font-family: var(--ky-font-head);
  font-size: 21px;
  font-weight: 900;
  box-shadow: 0 6px 18px rgba(255, 107, 53, 0.3);
}

.footer-brand-name {
  display: inline-block;
  margin: 16px 0 10px;
  font-family: var(--ky-font-head);
  font-size: 26px;
  font-weight: 900;
  letter-spacing: 0.04em;
  color: var(--ky-white);
  transition: color 0.2s ease;
}

.footer-brand-name:hover {
  color: var(--ky-gold);
}

.footer-trust {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245, 247, 250, 0.72);
}

.footer-title {
  margin-bottom: 16px;
  font-family: var(--ky-font-index);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ky-gold);
}

.footer-link {
  display: block;
  padding: 6px 0;
  font-size: 15px;
  color: rgba(245, 247, 250, 0.78);
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-link:hover {
  padding-left: 6px;
  color: var(--ky-orange);
}

.footer-contact-line {
  display: block;
  padding: 5px 0;
  font-family: var(--ky-font-data);
  font-size: 13px;
  line-height: 1.6;
  color: rgba(245, 247, 250, 0.78);
  word-break: break-all;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  margin-top: 44px;
  padding-top: 22px;
  border-top: 1px solid rgba(233, 236, 243, 0.14);
  font-family: var(--ky-font-index);
  font-size: 13px;
  color: rgba(245, 247, 250, 0.58);
}

.footer-status {
  color: rgba(255, 215, 0, 0.78);
  letter-spacing: 0.08em;
}

.footer-icp {
  letter-spacing: 0.04em;
}

/* ---------- 17. 响应式调整 ---------- */
@media (max-width: 1020px) {
  .footer-cols {
    grid-template-columns: 1fr 1fr;
    gap: 34px;
  }

  .footer-about {
    max-width: none;
  }
}

@media (max-width: 720px) {
  .header-topline-inner {
    gap: 12px;
    font-size: 10px;
  }

  .hline-mid,
  .hline-region,
  .hline-spacer {
    display: none;
  }

  .footer-cols {
    grid-template-columns: 1fr;
    gap: 30px;
  }

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

  .back-top {
    right: 16px;
    bottom: 16px;
    width: 44px;
    height: 44px;
  }

  .page-wrap {
    padding-top: 28px;
  }
}

/* ---------- 18. 装饰性工具类 ---------- */
.grid-bg {
  background-image:
    linear-gradient(rgba(233, 236, 243, 0.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(233, 236, 243, 0.55) 1px, transparent 1px);
  background-size: 56px 56px;
}

.grid-bg-navy {
  background-image:
    linear-gradient(rgba(233, 236, 243, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(233, 236, 243, 0.07) 1px, transparent 1px);
  background-size: 56px 56px;
}

.speed-stripes {
  position: relative;
  overflow: hidden;
}

.speed-stripes::after {
  content: "";
  position: absolute;
  top: -15%;
  right: -6%;
  width: 22%;
  height: 130%;
  background: repeating-linear-gradient(
    -48deg,
    rgba(255, 107, 53, 0.13) 0 8px,
    transparent 8px 18px
  );
  pointer-events: none;
}

.oasis-glow {
  position: relative;
  overflow: hidden;
}

.oasis-glow::before {
  content: "";
  position: absolute;
  right: -90px;
  bottom: -90px;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, rgba(46, 139, 87, 0.3), transparent 68%);
  pointer-events: none;
}

.oasis-glow::after {
  content: "";
  position: absolute;
  right: 110px;
  bottom: 50px;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 215, 0, 0.16), transparent 70%);
  pointer-events: none;
}

/* ---------- 19. 显现与动效安全 ---------- */
.js-enabled [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: var(--reveal-delay, 0s);
}

.js-enabled [data-reveal][data-revealed] {
  opacity: 1;
  transform: translateY(0);
}

@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;
  }

  .js-enabled [data-reveal],
  .js-enabled [data-reveal][data-revealed] {
    opacity: 1;
    transform: none;
  }
}