/* ==========================================================
   光速·最新版 — 共享样式 Site CSS v1.0
   ========================================================== */

/* ---------- 1. Reset 与设计变量 ---------- */

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

:root {
  /* 色彩 */
  --gs-pitch: #1a5c2e;
  --gs-pitch-rgb: 26, 92, 46;
  --gs-warning: #f2c94c;
  --gs-warning-rgb: 242, 201, 76;
  --gs-red: #e63946;
  --gs-red-rgb: 230, 57, 70;
  --gs-silver: #c0c0c0;
  --gs-blue: #0077b6;
  --gs-dark: #0d1117;
  --gs-dark-rgb: 13, 17, 23;
  --gs-cream: #f5f0e8;
  --gs-stone: #6c757d;
  --gs-moss: #6b8e23;
  --gs-terra: #cc5500;

  /* 字体 */
  --gs-font-display: Impact, "Arial Black", "PingFang SC", "Microsoft YaHei", sans-serif;
  --gs-font-body: "Inter", "Roboto", "PingFang SC", "Microsoft YaHei", sans-serif;
  --gs-font-index: "Helvetica Neue", "PingFang SC", sans-serif;

  /* 字号 */
  --gs-fs-xs: 0.75rem;
  --gs-fs-sm: 0.875rem;
  --gs-fs-md: 1rem;
  --gs-fs-lg: 1.25rem;
  --gs-fs-xl: 1.625rem;
  --gs-fs-2xl: 2rem;
  --gs-fs-3xl: clamp(2.25rem, 5vw, 3.5rem);
  --gs-fs-hero: clamp(2.75rem, 8vw, 6.5rem);

  /* 间距 */
  --gs-space-1: 0.25rem;
  --gs-space-2: 0.5rem;
  --gs-space-3: 0.75rem;
  --gs-space-4: 1rem;
  --gs-space-5: 1.5rem;
  --gs-space-6: 2rem;
  --gs-space-7: 3rem;
  --gs-space-8: 4rem;
  --gs-space-9: 6rem;

  /* 布局 */
  --gs-container-max: 1440px;
  --gs-header-h: 4.5rem;
  --gs-header-h-mobile: 3.75rem;

  /* 动效 */
  --gs-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --gs-dur: 0.25s;

  /* 切角 */
  --gs-cut: 14px;
}

/* ---------- 2. 基础排版 ---------- */

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--gs-header-h-mobile) + 4px);
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

@media (min-width: 1024px) {
  html {
    scroll-padding-top: calc(var(--gs-header-h) + 4px);
  }
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--gs-font-body);
  font-size: var(--gs-fs-md);
  line-height: 1.65;
  color: var(--gs-cream);
  background-color: var(--gs-dark);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#main-content {
  display: block;
  flex: 1 0 auto;
  width: 100%;
}

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

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

a:hover,
a:focus-visible {
  color: var(--gs-warning);
  text-decoration: underline;
  text-underline-offset: 3px;
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--gs-font-display);
  font-weight: 700;
  line-height: 1.15;
  color: var(--gs-cream);
  margin-bottom: var(--gs-space-4);
  letter-spacing: 0.01em;
}

h1 { font-size: var(--gs-fs-hero); }
h2 { font-size: var(--gs-fs-3xl); }
h3 { font-size: var(--gs-fs-2xl); }
h4 { font-size: var(--gs-fs-xl); }
h5 { font-size: var(--gs-fs-lg); }
h6 { font-size: var(--gs-fs-md); }

p {
  margin-bottom: var(--gs-space-4);
  max-width: 70ch;
}

small {
  font-size: var(--gs-fs-sm);
  color: var(--gs-stone);
}

strong,
b {
  font-weight: 700;
  color: var(--gs-cream);
}

code {
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  background: rgba(192, 192, 192, 0.08);
  padding: 0.1em 0.35em;
  font-size: 0.9em;
}

hr {
  border: 0;
  border-top: 1px solid rgba(192, 192, 192, 0.15);
  margin: var(--gs-space-6) 0;
}

[hidden] {
  display: none !important;
}

/* ---------- 3. 布局容器 ---------- */

.gs-container {
  width: 100%;
  max-width: var(--gs-container-max);
  margin-inline: auto;
  padding-inline: var(--gs-space-4);
}

@media (min-width: 768px) {
  .gs-container {
    padding-inline: var(--gs-space-5);
  }
}

@media (min-width: 1280px) {
  .gs-container {
    padding-inline: var(--gs-space-7);
  }
}

.gs-section {
  padding-block: var(--gs-space-7) var(--gs-space-8);
}

@media (max-width: 639px) {
  .gs-section {
    padding-block: var(--gs-space-6) var(--gs-space-7);
  }
}

/* ---------- 4. 按钮 ---------- */

.gs-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--gs-space-2);
  padding: var(--gs-space-3) var(--gs-space-5);
  font-family: var(--gs-font-body);
  font-size: var(--gs-fs-sm);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.04em;
  text-align: center;
  text-decoration: none;
  border: 0;
  cursor: pointer;
  user-select: none;
  transition: transform 0.25s var(--gs-ease), box-shadow 0.25s var(--gs-ease), background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.gs-btn:hover,
.gs-btn:focus-visible {
  text-decoration: none;
}

.gs-btn-primary {
  background: var(--gs-red);
  color: var(--gs-cream);
  clip-path: polygon(0 0, calc(100% - var(--gs-cut)) 0, 100% var(--gs-cut), 100% 100%, var(--gs-cut) 100%, 0 calc(100% - var(--gs-cut)));
}

.gs-btn-primary:hover,
.gs-btn-primary:focus-visible {
  background: #ff4d5a;
  color: var(--gs-cream);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(230, 57, 70, 0.35);
}

.gs-btn-ghost {
  background: transparent;
  color: var(--gs-cream);
  border: 1px solid var(--gs-silver);
  clip-path: polygon(0 0, calc(100% - var(--gs-cut)) 0, 100% var(--gs-cut), 100% 100%, var(--gs-cut) 100%, 0 calc(100% - var(--gs-cut)));
}

.gs-btn-ghost:hover,
.gs-btn-ghost:focus-visible {
  border-color: var(--gs-warning);
  color: var(--gs-warning);
  transform: translateY(-2px);
}

/* ---------- 5. 头部 ---------- */

.gs-skip {
  position: fixed;
  top: -100%;
  left: var(--gs-space-4);
  z-index: 2000;
  padding: var(--gs-space-3) var(--gs-space-5);
  background: var(--gs-warning);
  color: var(--gs-dark);
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: top 0.2s ease;
}

.gs-skip:focus {
  top: var(--gs-space-3);
}

.gs-skip:hover {
  color: var(--gs-dark);
  text-decoration: none;
}

.gs-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(13, 17, 23, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 3px solid var(--gs-pitch);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.45);
}

.gs-header::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    -45deg,
    transparent 0,
    transparent 14px,
    rgba(192, 192, 192, 0.025) 14px,
    rgba(192, 192, 192, 0.025) 15px
  );
}

.gs-progress {
  position: absolute;
  bottom: 3px;
  left: 0;
  height: 2px;
  width: 0%;
  max-width: 100%;
  background: linear-gradient(90deg, var(--gs-warning), var(--gs-red));
  z-index: 6;
  transition: width 0.1s linear;
}

.gs-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gs-space-4);
  min-height: var(--gs-header-h-mobile);
  padding-block: var(--gs-space-2);
}

@media (min-width: 1024px) {
  .gs-header-inner {
    min-height: var(--gs-header-h);
  }
}

/* 品牌 */

.gs-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--gs-space-3);
  flex-shrink: 0;
  color: var(--gs-cream);
  text-decoration: none;
  margin-right: auto;
}

.gs-brand:hover,
.gs-brand:focus-visible {
  color: var(--gs-cream);
  text-decoration: none;
}

.gs-brand-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  font-family: var(--gs-font-display);
  font-weight: 900;
  font-size: 1.25rem;
  color: var(--gs-dark);
  background: linear-gradient(135deg, var(--gs-warning) 0%, var(--gs-warning) 72%, var(--gs-red) 72%, var(--gs-red) 100%);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  transform: skew(-6deg);
  transition: transform 0.25s var(--gs-ease);
}

.gs-brand:hover .gs-brand-badge {
  transform: skew(-6deg) scale(1.05);
}

.gs-brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.gs-brand-title {
  font-family: var(--gs-font-display);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.04em;
  color: var(--gs-cream);
}

.gs-brand-sub {
  font-size: 0.625rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gs-stone);
}

@media (max-width: 639px) {
  .gs-brand-badge {
    width: 34px;
    height: 34px;
    font-size: 1.05rem;
  }

  .gs-brand-title {
    font-size: 1.1rem;
  }

  .gs-brand-sub {
    display: none;
  }
}

/* 导航 */

.gs-nav {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 20;
  background: var(--gs-dark);
  border-bottom: 3px solid var(--gs-pitch);
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.5);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transition: max-height 0.35s var(--gs-ease), opacity 0.2s ease, visibility 0.2s ease;
}

.gs-nav[data-open] {
  max-height: calc(100vh - var(--gs-header-h-mobile));
  overflow-y: auto;
  opacity: 1;
  visibility: visible;
}

.gs-nav-list {
  display: flex;
  flex-direction: column;
  padding: var(--gs-space-4);
}

.gs-nav-item {
  border-bottom: 1px solid rgba(192, 192, 192, 0.1);
}

.gs-nav-item:last-child {
  border-bottom: 0;
}

.gs-nav-link {
  display: block;
  padding: var(--gs-space-4);
  font-size: var(--gs-fs-md);
  font-weight: 500;
  color: var(--gs-cream);
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.gs-nav-link::before {
  content: "◆";
  display: inline-block;
  margin-right: 0.5rem;
  font-size: 0.5rem;
  vertical-align: middle;
  color: var(--gs-silver);
  transform: rotate(45deg);
  transition: transform 0.2s var(--gs-ease), color 0.2s ease;
}

.gs-nav-link:hover,
.gs-nav-link:focus-visible {
  background: rgba(26, 92, 46, 0.25);
  color: var(--gs-warning);
  text-decoration: none;
}

.gs-nav-link:hover::before,
.gs-nav-link:focus-visible::before {
  color: var(--gs-warning);
  transform: rotate(0deg);
}

.gs-nav-link[aria-current="page"] {
  color: var(--gs-warning);
  font-weight: 700;
}

.gs-nav-link[aria-current="page"]::before {
  color: var(--gs-warning);
  transform: rotate(0deg);
}

@media (min-width: 1024px) {
  .gs-nav {
    position: static;
    max-height: none;
    overflow: visible;
    opacity: 1;
    visibility: visible;
    background: transparent;
    border: 0;
    box-shadow: none;
  }

  .gs-nav-list {
    flex-direction: row;
    align-items: center;
    gap: var(--gs-space-1);
    padding: 0;
  }

  .gs-nav-item {
    border-bottom: 0;
  }

  .gs-nav-link {
    position: relative;
    padding: var(--gs-space-2) var(--gs-space-3);
    font-size: var(--gs-fs-sm);
  }

  .gs-nav-link::after {
    content: "";
    position: absolute;
    left: var(--gs-space-3);
    right: var(--gs-space-3);
    bottom: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--gs-warning), var(--gs-red));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.25s var(--gs-ease);
  }

  .gs-nav-link:hover::after,
  .gs-nav-link:focus-visible::after,
  .gs-nav-link[aria-current="page"]::after {
    transform: scaleX(1);
  }

  .gs-nav-link:hover,
  .gs-nav-link:focus-visible {
    background: transparent;
  }
}

/* 头部操作区 */

.gs-header-actions {
  display: flex;
  align-items: center;
  gap: var(--gs-space-2);
  flex-shrink: 0;
}

.gs-btn-download {
  padding: 0.625rem 1.25rem;
  font-size: var(--gs-fs-sm);
}

@media (max-width: 639px) {
  .gs-btn-download {
    font-size: var(--gs-fs-xs);
    padding: 0.5rem 0.875rem;
  }
}

/* 移动端汉堡按钮 */

.gs-nav-toggle {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: transparent;
  border: 1px solid rgba(192, 192, 192, 0.2);
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.gs-nav-toggle:hover,
.gs-nav-toggle:focus-visible {
  background: rgba(242, 201, 76, 0.08);
  border-color: var(--gs-warning);
}

.gs-nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--gs-cream);
  transition: transform 0.25s var(--gs-ease), opacity 0.2s ease, background-color 0.2s ease;
}

.gs-nav-toggle[aria-expanded="true"] .gs-nav-toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.gs-nav-toggle[aria-expanded="true"] .gs-nav-toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (min-width: 1024px) {
  .gs-nav-toggle {
    display: none;
  }
}

/* ---------- 6. 页脚 ---------- */

.gs-footer {
  position: relative;
  margin-top: auto;
  background: var(--gs-dark);
  border-top: 4px solid var(--gs-pitch);
  padding-top: var(--gs-space-7);
  overflow: hidden;
}

.gs-footer::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 100%;
  height: 4px;
  background: repeating-linear-gradient(
    90deg,
    var(--gs-pitch) 0,
    var(--gs-pitch) 48px,
    transparent 48px,
    transparent 56px
  );
  opacity: 0.8;
}

.gs-footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gs-space-6);
  padding-bottom: var(--gs-space-6);
  border-bottom: 1px solid rgba(192, 192, 192, 0.12);
}

@media (min-width: 768px) and (max-width: 959px) {
  .gs-footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .gs-footer-brand {
    grid-column: 1 / -1;
  }
}

@media (min-width: 960px) {
  .gs-footer-grid {
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: var(--gs-space-7);
  }
}

.gs-footer-brand {
  max-width: 40ch;
}

.gs-footer-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--gs-space-2);
  font-family: var(--gs-font-display);
  font-size: var(--gs-fs-xl);
  font-weight: 700;
  color: var(--gs-cream);
  text-decoration: none;
  margin-bottom: var(--gs-space-4);
}

.gs-footer-logo:hover,
.gs-footer-logo:focus-visible {
  color: var(--gs-warning);
  text-decoration: none;
}

.gs-footer-logo-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  font-size: var(--gs-fs-md);
  color: var(--gs-dark);
  background: var(--gs-warning);
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 6px 100%, 0 calc(100% - 6px));
  transform: skew(-6deg);
}

.gs-footer-about {
  font-size: var(--gs-fs-sm);
  color: var(--gs-stone);
  line-height: 1.7;
  margin-bottom: var(--gs-space-4);
}

.gs-footer-trust {
  display: inline-flex;
  align-items: center;
  gap: var(--gs-space-2);
  padding: var(--gs-space-2) var(--gs-space-3);
  font-size: var(--gs-fs-xs);
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--gs-warning);
  background: rgba(242, 201, 76, 0.08);
  border: 1px solid rgba(242, 201, 76, 0.25);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  max-width: fit-content;
}

.gs-footer-block {
  min-width: 0;
}

.gs-footer-title {
  font-family: var(--gs-font-body);
  font-size: var(--gs-fs-xs);
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gs-warning);
  margin-bottom: var(--gs-space-4);
  position: relative;
  padding-bottom: var(--gs-space-2);
}

.gs-footer-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 2px;
  background: var(--gs-red);
}

.gs-footer-links,
.gs-footer-contact {
  display: flex;
  flex-direction: column;
  gap: var(--gs-space-3);
}

.gs-footer-links a {
  color: var(--gs-cream);
  font-size: var(--gs-fs-sm);
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.gs-footer-links a::before {
  content: "→";
  display: inline-block;
  margin-right: 0.375rem;
  color: var(--gs-blue);
  transition: transform 0.2s ease, color 0.2s ease;
}

.gs-footer-links a:hover,
.gs-footer-links a:focus-visible {
  color: var(--gs-warning);
  padding-left: 4px;
  text-decoration: none;
}

.gs-footer-links a:hover::before,
.gs-footer-links a:focus-visible::before {
  transform: translateX(4px);
  color: var(--gs-warning);
}

.gs-footer-contact li {
  display: flex;
  gap: var(--gs-space-2);
  font-size: var(--gs-fs-sm);
  color: var(--gs-cream);
  line-height: 1.6;
}

.gs-footer-contact li::before {
  content: "▹";
  color: var(--gs-pitch);
  font-weight: 700;
}

.gs-footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--gs-space-3);
  padding-block: var(--gs-space-4);
  font-size: var(--gs-fs-xs);
  color: var(--gs-stone);
}

.gs-footer-copyright,
.gs-footer-icp {
  margin: 0;
  color: var(--gs-stone);
}

@media (max-width: 639px) {
  .gs-footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ---------- 7. 面包屑 ---------- */

.gs-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--gs-space-2);
  margin-bottom: var(--gs-space-5);
  padding-block: var(--gs-space-3);
  font-size: var(--gs-fs-sm);
  color: var(--gs-stone);
  border-bottom: 1px solid rgba(192, 192, 192, 0.1);
}

.gs-breadcrumb li {
  display: inline-flex;
  align-items: center;
}

.gs-breadcrumb li + li::before {
  content: "→";
  margin-inline: var(--gs-space-2);
  color: var(--gs-silver);
  font-size: 0.75em;
}

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

.gs-breadcrumb a:hover,
.gs-breadcrumb a:focus-visible {
  color: var(--gs-warning);
  text-decoration: underline;
}

.gs-breadcrumb [aria-current="page"] {
  color: var(--gs-stone);
}

/* ---------- 8. 网格 ---------- */

.gs-grid {
  display: grid;
  gap: var(--gs-space-5);
}

.gs-grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.gs-grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.gs-grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.gs-grid--feature {
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
}

@media (max-width: 959px) {
  .gs-grid--3,
  .gs-grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .gs-grid--feature {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 639px) {
  .gs-grid--2,
  .gs-grid--3,
  .gs-grid--4 {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------- 9. 卡片 ---------- */

.gs-card {
  position: relative;
  padding: var(--gs-space-5);
  background: linear-gradient(145deg, rgba(26, 92, 46, 0.18) 0%, rgba(13, 17, 23, 0.4) 60%);
  border: 1px solid rgba(192, 192, 192, 0.15);
  clip-path: polygon(0 0, calc(100% - var(--gs-cut)) 0, 100% var(--gs-cut), 100% 100%, var(--gs-cut) 100%, 0 calc(100% - var(--gs-cut)));
  transition: transform 0.3s var(--gs-ease), box-shadow 0.3s var(--gs-ease), background-color 0.3s ease, border-color 0.3s ease;
}

.gs-card:hover,
.gs-card:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
  background-color: rgba(26, 92, 46, 0.25);
  border-color: rgba(242, 201, 76, 0.3);
}

.gs-card-title {
  font-family: var(--gs-font-display);
  font-size: var(--gs-fs-xl);
  font-weight: 700;
  color: var(--gs-cream);
  margin-bottom: var(--gs-space-3);
}

.gs-card-text {
  font-size: var(--gs-fs-sm);
  color: var(--gs-stone);
  margin-bottom: var(--gs-space-4);
}

/* ---------- 10. 标签 ---------- */

.gs-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--gs-space-1);
  padding: var(--gs-space-1) var(--gs-space-3);
  font-size: var(--gs-fs-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gs-warning);
  background: rgba(242, 201, 76, 0.1);
  border: 1px solid rgba(242, 201, 76, 0.25);
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 6px, 100% 100%, 6px 100%, 0 calc(100% - 6px));
  white-space: nowrap;
}

.gs-tag--red {
  color: var(--gs-red);
  background: rgba(230, 57, 70, 0.1);
  border-color: rgba(230, 57, 70, 0.3);
}

.gs-tag--blue {
  color: var(--gs-blue);
  background: rgba(0, 119, 182, 0.1);
  border-color: rgba(0, 119, 182, 0.3);
}

.gs-tag--moss {
  color: var(--gs-moss);
  background: rgba(107, 142, 35, 0.1);
  border-color: rgba(107, 142, 35, 0.3);
}

/* ---------- 11. 编号章节 ---------- */

.gs-chapter {
  display: grid;
  grid-template-columns: minmax(3.5rem, 5rem) 1fr;
  gap: var(--gs-space-4);
  align-items: start;
  margin-bottom: var(--gs-space-7);
}

.gs-chapter-num {
  font-family: var(--gs-font-index);
  font-weight: 100;
  font-size: clamp(2.75rem, 6vw, 4.5rem);
  line-height: 0.9;
  color: transparent;
  -webkit-text-stroke: 1px rgba(26, 92, 46, 0.8);
  user-select: none;
}

.gs-chapter-body {
  min-width: 0;
}

.gs-chapter-title {
  font-family: var(--gs-font-display);
  font-size: var(--gs-fs-2xl);
  font-weight: 700;
  margin-bottom: var(--gs-space-3);
}

@media (max-width: 639px) {
  .gs-chapter {
    grid-template-columns: 1fr;
    gap: var(--gs-space-2);
  }

  .gs-chapter-num {
    font-size: 2.5rem;
  }
}

/* ---------- 12. 标签页 ---------- */

.gs-tabs {
  border: 1px solid rgba(192, 192, 192, 0.15);
  background: rgba(13, 17, 23, 0.5);
  clip-path: polygon(0 0, calc(100% - var(--gs-cut)) 0, 100% var(--gs-cut), 100% 100%, var(--gs-cut) 100%, 0 calc(100% - var(--gs-cut)));
}

.gs-tabs-list {
  display: flex;
  flex-wrap: wrap;
  border-bottom: 1px solid rgba(192, 192, 192, 0.15);
  overflow-x: auto;
}

.gs-tabs-trigger {
  display: inline-flex;
  align-items: center;
  padding: var(--gs-space-3) var(--gs-space-5);
  background: transparent;
  border: 0;
  border-right: 1px solid rgba(192, 192, 192, 0.1);
  font-family: var(--gs-font-body);
  font-size: var(--gs-fs-sm);
  font-weight: 500;
  color: var(--gs-cream);
  cursor: pointer;
  transition: background-color 0.25s ease, color 0.25s ease;
  white-space: nowrap;
}

.gs-tabs-trigger:last-child {
  border-right: 0;
}

.gs-tabs-trigger:hover,
.gs-tabs-trigger:focus-visible {
  background: rgba(242, 201, 76, 0.08);
  outline: none;
}

.gs-tabs-trigger[aria-selected="true"] {
  background: var(--gs-pitch);
  color: var(--gs-cream);
  font-weight: 700;
  position: relative;
}

.gs-tabs-trigger[aria-selected="true"]::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gs-warning);
}

.gs-tabs-panel {
  padding: var(--gs-space-5);
}

/* ---------- 13. 滚动显现 ---------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.45s var(--gs-ease), transform 0.45s var(--gs-ease);
}

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

/* ---------- 14. 辅助工具 ---------- */

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

/* ---------- 15. 无障碍与动效偏好 ---------- */

:focus-visible {
  outline: 2px solid var(--gs-warning);
  outline-offset: 3px;
}

@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;
    transition-delay: 0ms !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .gs-card:hover,
  .gs-card:focus-within {
    transform: none;
    box-shadow: none;
  }

  .gs-btn:hover,
  .gs-btn:focus-visible,
  .gs-btn-ghost:hover,
  .gs-btn-ghost:focus-visible {
    transform: none;
  }
}