/* ==========================================================================
   三亿平台 — 全站共享样式 /assets/site.css
   视觉主题：深空数据竞技场
   ========================================================================== */

/* ===== 1. Reset ===== */
*,
*::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: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  overflow-x: hidden;
}

img,
svg,
video,
figure {
  max-width: 100%;
  display: block;
  margin: 0;
}

ul,
ol {
  padding-left: 1.5em;
}

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

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--ease-fast), border-color var(--ease-fast),
    background-color var(--ease-fast), box-shadow var(--ease-fast);
}

a:hover {
  color: var(--color-green);
}

:focus-visible {
  outline: 2px solid var(--color-green);
  outline-offset: 2px;
  border-radius: 2px;
}

::selection {
  background: var(--color-green);
  color: var(--color-bg);
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg);
}
::-webkit-scrollbar-thumb {
  background: #24405E;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-bg-elevate);
}

/* ===== 2. CSS 变量 ===== */
:root {
  --color-bg: #0A1E3D;
  --color-bg-card: #162A4A;
  --color-bg-aux: #2B2D31;
  --color-bg-elevate: #203A61;
  --color-green: #39FF14;
  --color-green-soft: rgba(57, 255, 20, 0.1);
  --color-orange: #FF6600;
  --color-orange-soft: rgba(255, 102, 0, 0.1);
  --color-purple: #7B2FFF;
  --color-purple-light: #9F5FFF;
  --color-purple-soft: rgba(123, 47, 255, 0.15);
  --color-text: #F5F2E9;
  --color-text-dim: rgba(245, 242, 233, 0.62);
  --color-text-faint: rgba(245, 242, 233, 0.35);
  --color-link: #00B4D8;
  --color-terracotta: #E07A5F;
  --color-border: rgba(245, 242, 233, 0.08);
  --color-border-strong: rgba(245, 242, 233, 0.18);

  --gradient-accent: linear-gradient(135deg, var(--color-purple), var(--color-purple-light));
  --gradient-data: linear-gradient(90deg, var(--color-green), var(--color-purple), var(--color-orange));

  --font-title: Impact, 'Oswald', 'Noto Sans SC', sans-serif;
  --font-body: 'Noto Sans SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-data: 'Roboto Mono', 'SF Mono', monospace;

  --content-width: 1200px;
  --header-height: 72px;
  --header-height-mobile: 60px;

  --radius-sm: 3px;
  --radius-md: 6px;
  --radius-lg: 12px;

  --ease-fast: 150ms ease;
  --ease-base: 200ms ease;
}

/* ===== 3. 中文排版 ===== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-title);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.01em;
  color: var(--color-text);
}

h1 {
  font-size: clamp(2rem, 4vw, 3.5rem);
}
h2 {
  font-size: clamp(1.5rem, 2.5vw, 2.25rem);
}
h3 {
  font-size: clamp(1.125rem, 1.5vw, 1.5rem);
}
h4 {
  font-size: 1.125rem;
}

p {
  margin-bottom: 1em;
}

.main-content {
  min-height: 70vh;
}

/* ===== 4. 工具类 ===== */
.container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px;
}

.grid {
  display: grid;
  gap: var(--gap, 24px);
}
.grid-cols-2 {
  grid-template-columns: repeat(2, 1fr);
}
.grid-cols-3 {
  grid-template-columns: repeat(3, 1fr);
}
.grid-cols-4 {
  grid-template-columns: repeat(4, 1fr);
}
@media (max-width: 1000px) {
  .grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 640px) {
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr;
  }
}

.section {
  padding: 64px 0;
}
.section-tight {
  padding: 32px 0;
}
.section-header {
  margin-bottom: 32px;
}
.section-kicker {
  display: block;
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-green);
  margin-bottom: 6px;
}

.page-top {
  padding-top: calc(var(--header-height) + 40px);
}

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-height) + 48px) 0 64px;
  position: relative;
}

.bg-grid {
  background-image: linear-gradient(rgba(57, 255, 20, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 255, 20, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
}
.bg-coordinate {
  background-image: linear-gradient(rgba(57, 255, 20, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 255, 20, 0.04) 1px, transparent 1px),
    linear-gradient(rgba(57, 255, 20, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 255, 20, 0.08) 1px, transparent 1px);
  background-size: 48px 48px, 48px 48px, 240px 240px, 240px 240px;
}

.chamfer {
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

/* ===== 5. 通用按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.3;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--ease-fast), background-color var(--ease-fast),
    border-color var(--ease-fast), color var(--ease-fast), box-shadow var(--ease-fast);
  background: transparent;
  color: var(--color-text);
}
.btn:hover {
  transform: translateY(-2px);
}
.btn:active {
  transform: translateY(0);
}
.btn-primary {
  background: var(--color-green);
  color: var(--color-bg);
}
.btn-primary:hover {
  background: #5CFF3D;
  box-shadow: 0 0 20px rgba(57, 255, 20, 0.35);
  color: var(--color-bg);
}
.btn-secondary {
  border-color: var(--color-green);
  color: var(--color-green);
}
.btn-secondary:hover {
  background: var(--color-green-soft);
  color: var(--color-green);
}
.btn-orange {
  background: var(--color-orange);
  color: var(--color-bg);
}
.btn-orange:hover {
  background: #FF7A1F;
  box-shadow: 0 0 16px rgba(255, 102, 0, 0.35);
  color: var(--color-bg);
}

/* ===== 6. 面包屑 ===== */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-dim);
  margin-bottom: 24px;
}
.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  padding: 0;
}
.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  color: var(--color-text-faint);
}
.breadcrumb-item a {
  color: var(--color-link);
  text-decoration: none;
}
.breadcrumb-item a:hover {
  color: var(--color-green);
}
.breadcrumb-item[aria-current="page"] {
  color: var(--color-green);
  font-weight: 600;
}

/* ===== 7. 卡片与面板 ===== */
.panel {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: relative;
  transition: border-color var(--ease-base), box-shadow var(--ease-base);
}
.panel:hover {
  border-color: rgba(57, 255, 20, 0.2);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: border-color var(--ease-fast), transform var(--ease-fast),
    box-shadow var(--ease-fast);
}
.card:hover {
  border-color: rgba(57, 255, 20, 0.25);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

/* ===== 8. 标签与数据 ===== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 3px 10px;
  border-radius: 2px;
  background: var(--color-green-soft);
  border: 1px solid rgba(57, 255, 20, 0.3);
  color: var(--color-green);
  text-transform: uppercase;
  line-height: 1.6;
}
.tag--orange {
  background: var(--color-orange-soft);
  border-color: rgba(255, 102, 0, 0.3);
  color: var(--color-orange);
}
.tag--purple {
  background: var(--color-purple-soft);
  border-color: rgba(123, 47, 255, 0.35);
  color: var(--color-purple-light);
}

.stat {
  font-family: var(--font-data);
  font-size: 32px;
  font-weight: 700;
  color: var(--color-green);
  line-height: 1.2;
}
.stat--orange {
  color: var(--color-orange);
}
.stat-label {
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-dim);
}

/* ===== 9. 数据表格 ===== */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.data-table thead th {
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-green);
  text-align: left;
  padding: 12px 16px;
  background: rgba(57, 255, 20, 0.06);
  border-bottom: 1px solid rgba(57, 255, 20, 0.25);
  white-space: nowrap;
}
.data-table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-dim);
}
.data-table tbody tr:hover td {
  background: rgba(57, 255, 20, 0.03);
  color: var(--color-text);
}

/* ===== 10. 图片占位容器 ===== */
.image-placeholder {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  background: linear-gradient(135deg, rgba(57, 255, 20, 0.04), rgba(123, 47, 255, 0.08)),
    var(--color-bg-card);
  border: 1px dashed rgba(245, 242, 233, 0.15);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.image-placeholder::before {
  content: attr(data-label);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--color-text-faint);
  text-transform: uppercase;
  padding: 4px 10px;
  border: 1px solid rgba(245, 242, 233, 0.1);
  border-radius: 2px;
}
.image-placeholder::after {
  content: "";
  position: absolute;
  right: -24px;
  bottom: -24px;
  width: 90px;
  height: 90px;
  background: linear-gradient(135deg, var(--color-purple) 0%, transparent 60%);
  opacity: 0.15;
  transform: rotate(45deg);
  border-radius: 4px;
}
.aspect-wide {
  aspect-ratio: 16 / 8;
}
.aspect-square {
  aspect-ratio: 1;
}
.aspect-video {
  aspect-ratio: 16 / 9;
}

/* ===== 11. 笔记与提示 ===== */
.note {
  background: var(--color-purple-soft);
  border-left: 3px solid var(--color-purple);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 14px;
  color: var(--color-text-dim);
}

/* ===== 12. Skip Link ===== */
.skip-link {
  position: fixed;
  top: -48px;
  left: 16px;
  z-index: 1200;
  background: var(--color-green);
  color: var(--color-bg);
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 700;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  text-decoration: none;
  transition: top var(--ease-fast);
}
.skip-link:hover {
  color: var(--color-bg);
}
.skip-link:focus {
  top: 0;
  outline: 2px solid var(--color-text);
  outline-offset: -4px;
}

/* ===== 13. 滚动进度条 ===== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--color-green), var(--color-purple) 60%, var(--color-orange));
  z-index: 1100;
  pointer-events: none;
  transition: width 60ms linear;
}

/* ===== 14. 头部 ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background var(--ease-base), box-shadow var(--ease-base),
    border-color var(--ease-base);
}
.site-header[data-scroll="true"] {
  background: rgba(10, 30, 61, 0.94);
  border-bottom-color: rgba(57, 255, 20, 0.15);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.header-inner {
  max-width: var(--content-width);
  height: var(--header-height);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
  color: var(--color-text);
}
.brand:hover {
  color: var(--color-text);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.brand-mark::before {
  content: "";
  display: block;
  width: 10px;
  height: 10px;
  background: var(--color-green);
  border-radius: 1px;
  transform: rotate(45deg);
  box-shadow: 0 0 10px rgba(57, 255, 20, 0.5);
}
.brand-mark::after {
  content: "";
  display: block;
  width: 24px;
  height: 3px;
  background: var(--gradient-accent);
  border-radius: 1px;
}

.brand-name {
  font-family: var(--font-title);
  font-size: 22px;
  letter-spacing: 0.05em;
  line-height: 1;
}

.brand-suffix {
  font-family: var(--font-data);
  font-size: 10px;
  font-weight: 700;
  color: var(--color-green);
  background: var(--color-green-soft);
  border: 1px solid rgba(57, 255, 20, 0.3);
  padding: 2px 6px;
  border-radius: 2px;
  letter-spacing: 0.08em;
}

/* ===== 15. 导航 ===== */
.site-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
  padding: 0;
}

.nav-item a {
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  position: relative;
  white-space: nowrap;
  transition: color var(--ease-fast);
}
.nav-item a::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 3px;
  height: 2px;
  background: var(--color-green);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform var(--ease-base);
}
.nav-item a:hover {
  color: var(--color-green);
}
.nav-item a:hover::after {
  transform: scaleX(1);
  transform-origin: left center;
}
.nav-item a[aria-current="page"] {
  color: var(--color-green);
}
.nav-item a[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-index {
  font-family: var(--font-data);
  font-size: 10px;
  font-weight: 700;
  color: var(--color-text-faint);
  transition: color var(--ease-fast);
}
.nav-item a:hover .nav-index,
.nav-item a[aria-current="page"] .nav-index {
  color: var(--color-green);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: var(--color-green);
  color: var(--color-bg);
  font-size: 13px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: background var(--ease-fast), box-shadow var(--ease-fast),
    transform var(--ease-fast), color var(--ease-fast);
}
.header-cta::before {
  content: "";
  width: 0;
  height: 0;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left: 7px solid var(--color-bg);
}
.header-cta:hover {
  background: #5CFF3D;
  box-shadow: 0 0 24px rgba(57, 255, 20, 0.35);
  transform: translateY(-1px);
  color: var(--color-bg);
}

.nav-mobile-cta {
  display: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  background: transparent;
  border: 1px solid rgba(245, 242, 233, 0.2);
  border-radius: var(--radius-md);
  cursor: pointer;
  padding: 8px;
  flex-shrink: 0;
  transition: border-color var(--ease-fast), background-color var(--ease-fast);
}
.nav-toggle:hover {
  border-color: var(--color-green);
}
.nav-toggle[aria-expanded="true"] {
  background: rgba(57, 255, 20, 0.06);
  border-color: rgba(57, 255, 20, 0.4);
}
.nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--ease-base), opacity var(--ease-fast),
    background-color var(--ease-fast);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background: var(--color-green);
}
.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);
  background: var(--color-green);
}

/* ===== 16. 导航遮罩 ===== */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(4, 12, 30, 0.62);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--ease-base), visibility var(--ease-base);
}
.nav-overlay[data-open="true"] {
  opacity: 1;
  visibility: visible;
}

/* ===== 17. 页脚 ===== */
.site-footer {
  position: relative;
  background: var(--color-bg-aux);
  margin-top: 64px;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-green) 0%, var(--color-purple) 50%, var(--color-orange) 100%);
  z-index: 2;
}

.footer-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 56px 24px 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--color-text);
}
.footer-brand:hover {
  color: var(--color-text);
}
.footer-brand:hover .brand-name {
  color: var(--color-green);
}
.footer-brand .brand-name {
  transition: color var(--ease-fast);
}

.footer-trust {
  font-size: 13px;
  line-height: 1.8;
  color: var(--color-text-dim);
  margin-top: 16px;
  max-width: 360px;
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--color-green);
  border-radius: 50%;
  box-shadow: 0 0 8px rgba(57, 255, 20, 0.7);
  margin-right: 6px;
  vertical-align: middle;
}

.footer-heading {
  font-family: var(--font-title);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-text);
  margin-bottom: 18px;
  padding-bottom: 8px;
  position: relative;
  line-height: 1.4;
}
.footer-heading::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 2px;
  background: var(--color-green);
}

.footer-links {
  list-style: none;
  padding: 0;
}
.footer-links li {
  margin-bottom: 8px;
}
.footer-links a {
  color: var(--color-text-dim);
  font-size: 14px;
  text-decoration: none;
  transition: color var(--ease-fast), padding-left var(--ease-fast);
}
.footer-links a:hover {
  color: var(--color-green);
  padding-left: 4px;
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--color-text-dim);
  line-height: 1.6;
}
.footer-contact-item > span:last-child {
  flex: 1;
  min-width: 0;
}
.footer-contact-label {
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-green);
  background: rgba(57, 255, 20, 0.08);
  border: 1px solid rgba(57, 255, 20, 0.2);
  padding: 2px 7px;
  border-radius: 2px;
  flex-shrink: 0;
  line-height: 1.5;
}

.footer-bottom {
  border-top: 1px solid rgba(245, 242, 233, 0.06);
  background: rgba(0, 0, 0, 0.18);
}
.footer-bottom-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 24px;
  font-size: 13px;
  color: var(--color-text-faint);
  font-family: var(--font-data);
}
.footer-bottom-inner p {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
}

/* ===== 18. 响应式 ===== */
@media (max-width: 1000px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  :root {
    --header-height: 60px;
  }

  .header-inner {
    padding: 0 16px;
    gap: 12px;
  }

  .header-cta {
    padding: 6px 14px;
    font-size: 12px;
  }

  .nav-toggle {
    display: flex;
    position: relative;
    z-index: 2;
  }

  .site-nav {
    margin-left: 0;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(320px, 85vw);
    background: var(--color-bg-card);
    border-left: 1px solid rgba(57, 255, 20, 0.2);
    box-shadow: -12px 0 32px rgba(0, 0, 0, 0.45);
    transform: translateX(100%);
    transition: transform var(--ease-base);
    display: flex;
    flex-direction: column;
    padding: calc(var(--header-height-mobile) + 32px) 24px 32px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    z-index: 2;
  }
  .site-nav[data-open="true"] {
    transform: translateX(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav-item a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    font-size: 15px;
    border-radius: var(--radius-sm);
    border-left: 3px solid transparent;
  }
  .nav-item a::after {
    display: none;
  }
  .nav-item a:hover,
  .nav-item a[aria-current="page"] {
    background: var(--color-green-soft);
    border-left-color: var(--color-green);
    color: var(--color-green);
  }

  .nav-mobile-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 16px;
    background: var(--color-green);
    color: var(--color-bg);
    font-weight: 700;
    font-size: 14px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: background var(--ease-fast), box-shadow var(--ease-fast);
  }
  .nav-mobile-cta:hover {
    background: #5CFF3D;
    box-shadow: 0 0 20px rgba(57, 255, 20, 0.3);
    color: var(--color-bg);
  }

  .brand-suffix {
    display: none;
  }

  .brand {
    margin-right: auto;
  }
}

@media (max-width: 560px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .section {
    padding: 48px 0;
  }
  .hero {
    padding: calc(var(--header-height) + 32px) 0 48px;
  }
}

@media (max-width: 400px) {
  .brand-name {
    font-size: 20px;
  }
  .header-cta {
    padding: 5px 10px;
    font-size: 11px;
  }
  .header-cta::before {
    border-top-width: 4px;
    border-bottom-width: 4px;
    border-left-width: 6px;
  }
}

/* ===== 19. 无障碍与减少动效 ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}