/* ==========================================================================
   C7电子娱乐中国站 — 全站共享样式
   文件位置：/assets/site.css
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  /* 色彩系统 */
  --color-space: #0B1026;
  --color-purple: #7B2FEA;
  --color-purple-soft: #9B6BFF;
  --color-neon: #00FF9D;
  --color-orange: #FF6C00;
  --color-card: #151A33;
  --color-light: #EAF0FF;
  --color-muted: #9AA3C2;
  --color-line: #2E3A5E;
  --color-sky: #C7D6FF;
  --color-neon-soft: #79F2C8;

  /* 字体系统 */
  --font-main: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;

  /* 布局变量 */
  --container: 1200px;
  --gutter: 24px;
  --header-top-h: 42px;
  --header-nav-h: 64px;

  /* 动效变量 */
  --t-fast: 0.2s ease;
  --t-base: 0.35s ease;
  --t-slow: 0.65s cubic-bezier(0.16, 1, 0.3, 1);

  /* 层级变量 */
  --z-progress: 9980;
  --z-skip: 9990;
  --z-header: 100;

  /* 字号变量 */
  --fs-display: clamp(34px, 6vw, 56px);
  --fs-h1: clamp(30px, 5vw, 40px);
  --fs-h2: clamp(22px, 4vw, 28px);
  --fs-h3: 20px;
  --fs-body: 16px;
  --fs-caption: 14px;
  --fs-micro: 12px;
}

/* ---------- 2. 重置 ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  min-height: 100vh;
  font-family: var(--font-main);
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--color-light);
  background-color: var(--color-space);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--color-sky);
  text-decoration: none;
  transition: color var(--t-fast);
}

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

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

ul,
ol {
  list-style: none;
}

::selection {
  background: var(--color-purple);
  color: var(--color-light);
}

/* ---------- 3. 基础工具 ---------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.content-container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

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

#main-content:focus {
  outline: none;
}

/* ---------- 4. 焦点样式 ---------- */
:focus-visible {
  outline: 2px solid var(--color-neon);
  outline-offset: 2px;
}

.skip-link:focus-visible {
  outline: 2px solid var(--color-space);
  outline-offset: -2px;
}

/* ---------- 5. 页面章节容器 ---------- */
.page-section {
  position: relative;
  padding: 88px 0;
}

.page-section--tight {
  padding: 48px 0;
}

.page-section--loose {
  padding: 120px 0;
}

/* ---------- 6. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  top: -48px;
  left: 16px;
  z-index: var(--z-skip);
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  background: var(--color-neon);
  color: var(--color-space);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 8px;
}

/* ---------- 7. 滚动进度条 ---------- */
.scroll-progress {
  --progress: 0;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: var(--z-progress);
  background: var(--color-line);
  pointer-events: none;
}

.scroll-progress::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--color-purple), var(--color-neon));
  transform: scaleX(var(--progress));
  transform-origin: left center;
}

/* ---------- 8. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(11, 16, 38, 0.92);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-line);
}

.site-header__top {
  background: rgba(11, 16, 38, 0.72);
  border-bottom: 1px solid var(--color-line);
}

.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  max-width: var(--container);
  height: var(--header-top-h);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.site-header__logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-light);
  text-decoration: none;
}

.site-header__logo:hover {
  color: var(--color-neon);
}

.site-header__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 26px;
  flex: 0 0 auto;
  background: var(--color-purple);
  color: var(--color-light);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.03em;
  clip-path: polygon(0 0, calc(100% - 7px) 0, 100% 50%, calc(100% - 7px) 100%, 0 100%);
  transition: box-shadow var(--t-fast);
}

.site-header__logo:hover .site-header__mark {
  box-shadow: 0 0 16px rgba(123, 47, 234, 0.55);
}

.site-header__name {
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.site-header__meta {
  display: flex;
  align-items: center;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--color-muted);
  white-space: nowrap;
}

.site-header__site {
  letter-spacing: 0.06em;
}

.site-header__status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--color-muted);
}

.site-header__pulse {
  width: 6px;
  height: 6px;
  background: var(--color-neon);
  border-radius: 50%;
  animation: c7-pulse 2s ease infinite;
}

@keyframes c7-pulse {
  0%, 100% {
    opacity: 1;
    box-shadow: 0 0 0 0 rgba(0, 255, 157, 0.4);
  }
  50% {
    opacity: 0.7;
    box-shadow: 0 0 0 5px rgba(0, 255, 157, 0);
  }
}

/* ---------- 9. 主导航 ---------- */
.site-nav__list {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  max-width: var(--container);
  height: var(--header-nav-h);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.site-nav__item {
  position: relative;
  margin-right: 4px;
}

.site-nav__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 16px;
  color: var(--color-muted);
  font-size: 15px;
  font-weight: 500;
  position: relative;
  transition: color var(--t-fast);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 4px;
  height: 2px;
  background: var(--color-purple);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-base);
}

.site-nav__link:hover,
.site-nav__link[aria-current="page"] {
  color: var(--color-light);
}

.site-nav__link:hover::after,
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.site-nav__link[aria-current="page"] {
  font-weight: 700;
}

.site-nav__index {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-purple-soft);
  letter-spacing: 0.05em;
  transition: color var(--t-fast);
}

.site-nav__link:hover .site-nav__index,
.site-nav__link[aria-current="page"] .site-nav__index {
  color: var(--color-neon);
}

/* ---------- 10. 移动导航按钮 ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: stretch;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 32px;
  padding: 6px 8px;
  background: transparent;
  border: 1px solid var(--color-line);
  transition: border-color var(--t-fast);
}

.nav-toggle:hover {
  border-color: var(--color-purple);
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  background: var(--color-light);
  transition: transform var(--t-fast), opacity var(--t-fast), background-color var(--t-fast);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__bar--mid {
  opacity: 0;
}

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

/* ---------- 11. 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--color-card);
  border-top: 1px solid var(--color-line);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-purple), var(--color-neon) 40%, var(--color-purple));
  opacity: 0.55;
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 2.2fr 1fr 1.1fr 1.4fr;
  gap: 48px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 64px var(--gutter) 56px;
}

.site-footer__logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-light);
  text-decoration: none;
}

.site-footer__logo:hover {
  color: var(--color-neon);
}

.site-footer__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 26px;
  background: var(--color-purple);
  color: var(--color-light);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.03em;
  clip-path: polygon(0 0, calc(100% - 7px) 0, 100% 50%, calc(100% - 7px) 100%, 0 100%);
}

.site-footer__name {
  font-size: 16px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.site-footer__tagline {
  margin-top: 14px;
  font-size: var(--fs-caption);
  color: var(--color-muted);
}

.site-footer__statement {
  margin-top: 12px;
  max-width: 320px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-muted);
}

.site-footer__heading {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-light);
  letter-spacing: 0.04em;
}

.site-footer__heading > span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-neon);
  letter-spacing: 0.05em;
}

.site-footer__heading--sec {
  margin-top: 28px;
}

.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer__list a {
  display: inline-block;
  color: var(--color-muted);
  font-size: var(--fs-caption);
  transition: color var(--t-fast), padding-left var(--t-fast);
}

.site-footer__list a:hover {
  color: var(--color-neon);
  padding-left: 4px;
}

.site-footer__list--meta {
  gap: 0;
}

.site-footer__list--meta li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--color-line);
  font-size: var(--fs-caption);
  color: var(--color-muted);
  line-height: 1.5;
}

.site-footer__list--meta li:first-child {
  padding-top: 0;
}

.site-footer__list--meta li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.site-footer__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--color-neon);
  text-transform: uppercase;
}

.site-footer__note {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-muted);
  letter-spacing: 0.03em;
}

.site-footer__bottom {
  border-top: 1px solid var(--color-line);
  background: var(--color-space);
}

.site-footer__bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px var(--gutter);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--color-muted);
  letter-spacing: 0.04em;
}

/* ---------- 12. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  font-family: var(--font-main);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--t-fast), background-color var(--t-fast), color var(--t-fast), border-color var(--t-fast), box-shadow var(--t-fast);
}

.btn--primary {
  background: var(--color-purple);
  color: var(--color-light);
}

.btn--primary:hover {
  background: var(--color-purple-soft);
  color: var(--color-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(123, 47, 234, 0.3);
}

.btn--accent {
  background: var(--color-orange);
  color: var(--color-light);
}

.btn--accent:hover {
  background: #E56100;
  color: var(--color-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 108, 0, 0.3);
}

.btn--ghost {
  border-color: var(--color-line);
  color: var(--color-light);
  background: transparent;
}

.btn--ghost:hover {
  border-color: var(--color-neon);
  color: var(--color-neon);
  transform: translateY(-2px);
}

/* ---------- 13. 章节档案夹 ---------- */
.dossier__head {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 40px;
}

.dossier__index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  min-width: 56px;
  height: 35px;
  padding: 0 12px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-neon);
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-purple);
  letter-spacing: 0.05em;
}

.dossier__title {
  font-size: var(--fs-h2);
  font-weight: 900;
  line-height: 1.3;
  color: var(--color-light);
  letter-spacing: 0.02em;
}

.dossier__desc {
  margin-top: 6px;
  max-width: 560px;
  font-size: var(--fs-caption);
  color: var(--color-muted);
}

/* ---------- 14. 资料卡网格 ---------- */
.archive-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.file-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--color-card);
  border: 1px solid var(--color-line);
  transition: border-color var(--t-base), transform var(--t-base);
}

.file-card:hover {
  border-color: var(--color-purple);
  transform: translateY(-4px);
}

.file-card__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px 0;
}

.file-card__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-light);
  line-height: 1.4;
}

.file-card__meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-muted);
  letter-spacing: 0.05em;
}

.file-card__body {
  flex: 1;
  padding: 0 20px 20px;
}

.file-card__text {
  font-size: var(--fs-caption);
  color: var(--color-muted);
  line-height: 1.7;
}

/* ---------- 15. 分类标签 ---------- */
.label-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  border: 1px solid var(--color-line);
  color: var(--color-muted);
  background: transparent;
  white-space: nowrap;
}

.label-tag--purple {
  border-color: var(--color-purple);
  color: var(--color-purple-soft);
}

.label-tag--green {
  border-color: var(--color-neon);
  color: var(--color-neon);
}

.label-tag--orange {
  border-color: var(--color-orange);
  color: #FF994A;
}

.label-tag--blue {
  border-color: var(--color-line);
  color: var(--color-sky);
}

/* ---------- 16. 图片容器 ---------- */
.media {
  position: relative;
  overflow: hidden;
  background: var(--color-card);
  border: 1px solid var(--color-line);
}

.media::before {
  content: "";
  display: block;
  padding-top: 56.25%;
  background:
    linear-gradient(135deg, rgba(123, 47, 234, 0.12), transparent 60%),
    repeating-linear-gradient(45deg, transparent, transparent 8px, rgba(46, 58, 94, 0.25) 8px, rgba(46, 58, 94, 0.25) 9px);
}

.media--wide::before {
  padding-top: 42.86%;
}

.media--square::before {
  padding-top: 100%;
}

.media--portrait::before {
  padding-top: 125%;
}

.media > img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 17. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--color-muted);
  letter-spacing: 0.03em;
}

.breadcrumbs a {
  color: var(--color-muted);
  transition: color var(--t-fast);
}

.breadcrumbs a:hover {
  color: var(--color-neon);
}

.breadcrumbs__sep {
  color: var(--color-purple);
  font-size: 10px;
}

.breadcrumbs [aria-current="page"] {
  color: var(--color-light);
}

/* ---------- 18. 页面头图区 ---------- */
.page-hero {
  position: relative;
  padding: 80px 0 48px;
  border-bottom: 1px solid var(--color-line);
}

.page-hero__index {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-neon);
  letter-spacing: 0.08em;
}

.page-hero__title {
  font-size: var(--fs-h1);
  font-weight: 900;
  line-height: 1.2;
  color: var(--color-light);
  letter-spacing: 0.03em;
}

.page-hero__desc {
  margin-top: 16px;
  max-width: 600px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-muted);
}

/* ---------- 19. 筛选条 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}

.filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--color-muted);
  border: 1px solid var(--color-line);
  background: transparent;
  transition: color var(--t-fast), border-color var(--t-fast), background-color var(--t-fast);
}

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

.filter-btn.is-active {
  color: var(--color-space);
  background: var(--color-neon);
  border-color: var(--color-neon);
  font-weight: 700;
}

[data-filter-item].is-hidden {
  display: none;
}

/* ---------- 20. 滚动显现 ---------- */
[data-reveal] {
  opacity: 1;
  transform: none;
  transition: opacity var(--t-slow), transform var(--t-slow);
}

.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
}

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

/* ---------- 21. 响应式 ---------- */
@media (max-width: 1000px) {
  .archive-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

@media (max-width: 760px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    background: rgba(11, 16, 38, 0.97);
    border-bottom: 1px solid var(--color-line);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
  }

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

  .site-nav__list {
    flex-direction: column;
    height: auto;
    padding: 12px 0;
  }

  .site-nav__item {
    margin: 0;
    border-bottom: 1px solid var(--color-line);
  }

  .site-nav__item:last-child {
    border-bottom: none;
  }

  .site-nav__link {
    align-items: center;
    padding: 14px var(--gutter);
  }

  .site-nav__link::after {
    display: none;
  }

  .page-section {
    padding: 64px 0;
  }
}

@media (max-width: 640px) {
  .site-header__meta {
    display: none;
  }

  .archive-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 48px var(--gutter) 32px;
  }

  .site-footer__bottom-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .dossier__head {
    flex-direction: column;
    gap: 12px;
  }
}

/* ---------- 22. 减少动态效果 ---------- */
@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;
  }

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

  .site-header__pulse {
    animation: none;
  }
}