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

* {
  margin: 0;
  padding: 0;
}

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

:root {
  --color-red: #FF2A2A;
  --color-black: #0A0A0A;
  --color-dark: #121212;
  --color-white: #F5F5F5;
  --color-blue: #00D4FF;
  --color-silver: #C0C0C0;
  --color-green: #2E8B77;
  --color-darkred: #8B0000;
  --color-gray: #666666;
  --color-lightgray: #E0E0E0;

  --header-font: "DIN Condensed", "Arial Narrow", "Helvetica Neue", sans-serif;
  --body-font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  --site-width: 1200px;
  --site-gutter: 24px;
  --border-color: rgba(192, 192, 192, 0.2);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

body {
  margin: 0;
  font-family: var(--body-font);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-white);
  background-color: var(--color-black);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: none;
  cursor: pointer;
}

ul,
ol {
  list-style: none;
}

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

address {
  font-style: normal;
}

p,
h1,
h2,
h3,
h4,
h5,
h6 {
  overflow-wrap: break-word;
}

::selection {
  background: var(--color-red);
  color: #fff;
}

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

:focus:not(:focus-visible) {
  outline: none;
}

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

/* ---------- 焦点锚点链接 ---------- */

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--color-red);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1;
  padding: 12px 24px;
}

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

/* ---------- 通用容器与分块 ---------- */

.site-container {
  width: 100%;
  max-width: var(--site-width);
  margin-inline: auto;
  padding-inline: var(--site-gutter);
}

.section {
  padding-block: 72px;
}

.section--light {
  background: var(--color-white);
  color: var(--color-black);
}

.section--light .section-desc {
  color: var(--color-gray);
}

.section--light .btn--ghost {
  border-color: rgba(10, 10, 10, 0.4);
  color: var(--color-black);
}

.section--light .btn--ghost:hover {
  border-color: var(--color-black);
  background: rgba(10, 10, 10, 0.06);
}

/* ---------- 章节标题体系 ---------- */

.eyebrow {
  display: inline-block;
  font-family: var(--header-font);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-red);
  border-left: 3px solid var(--color-red);
  padding-left: 10px;
  margin-bottom: 14px;
}

.section-title {
  font-family: var(--header-font);
  font-weight: 900;
  font-style: italic;
  text-transform: uppercase;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1;
  color: var(--color-white);
  margin-bottom: 12px;
}

.section--light .section-title {
  color: var(--color-black);
}

.section-desc {
  font-size: 0.92rem;
  color: var(--color-gray);
  max-width: 480px;
  margin-bottom: 28px;
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 12px 24px;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.btn--primary {
  background: var(--color-red);
  color: #fff;
  border-color: var(--color-red);
}

.btn--primary:hover {
  background: #e61d1d;
  border-color: #e61d1d;
  transform: translateY(-2px);
}

.btn--ghost {
  border-color: rgba(245, 245, 245, 0.4);
  color: var(--color-white);
}

.btn--ghost:hover {
  border-color: var(--color-white);
  background: rgba(255, 255, 255, 0.06);
  transform: translateY(-2px);
}

.btn--outline-red {
  border-color: var(--color-red);
  color: var(--color-red);
}

.btn--outline-red:hover {
  background: var(--color-red);
  color: #fff;
  transform: translateY(-2px);
}

/* ---------- 网格 ---------- */

.grid {
  display: grid;
  gap: 24px;
}

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

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

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

/* ---------- 卡片 ---------- */

.card {
  border: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.02);
  transition: border-color 0.3s ease, transform 0.3s ease;
}

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

.card__body {
  padding: 24px;
}

.card__title {
  font-family: var(--header-font);
  font-weight: 800;
  font-style: italic;
  text-transform: uppercase;
  font-size: 1.3rem;
  line-height: 1.15;
  color: var(--color-white);
  margin-bottom: 8px;
}

.section--light .card__title {
  color: var(--color-black);
}

.card__text {
  font-size: 0.85rem;
  color: var(--color-gray);
}

/* ---------- 图片容器 ---------- */

.img-frame {
  position: relative;
  display: block;
  width: 100%;
  background: var(--color-dark);
  overflow: hidden;
}

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

.img-frame--4-3 {
  aspect-ratio: 4 / 3;
}

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

.img-frame--full {
  aspect-ratio: 16 / 9;
  width: 100%;
}

.img-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image:
    linear-gradient(rgba(245, 245, 245, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 245, 245, 0.05) 1px, transparent 1px);
  background-size: 14px 14px;
  pointer-events: none;
}

.img-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(120deg, rgba(255, 42, 42, 0.1) 0%, transparent 35%);
  pointer-events: none;
}

/* ---------- 标签与筛选 ---------- */

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  font-size: 0.78rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
  color: var(--color-silver);
  background: transparent;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

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

.tag[aria-pressed="true"] {
  border-color: var(--color-red);
  color: var(--color-red);
  background: rgba(255, 42, 42, 0.08);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}

.is-hidden {
  display: none !important;
}

/* ---------- 面包屑 ---------- */

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--color-gray);
  padding-block: 16px;
}

.breadcrumbs a {
  color: var(--color-silver);
  transition: color 0.2s ease;
}

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

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

/* ---------- 内容排版 ---------- */

.prose {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--color-silver);
}

.prose p {
  margin-bottom: 1em;
}

.prose h2,
.prose h3 {
  font-family: var(--header-font);
  font-weight: 800;
  font-style: italic;
  text-transform: uppercase;
  color: var(--color-white);
}

.prose h2 {
  font-size: 1.6rem;
  margin-bottom: 0.6em;
}

.prose h3 {
  font-size: 1.3rem;
  margin-bottom: 0.5em;
}

.prose a {
  color: var(--color-blue);
  text-decoration: underline;
}

/* ---------- 数据指标 ---------- */

.data-number {
  font-family: var(--header-font);
  font-weight: 900;
  font-style: italic;
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--color-white);
}

.data-number--red {
  color: var(--color-red);
}

.data-label {
  display: block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-gray);
  margin-top: 6px;
}

/* ---------- 元信息 ---------- */

.meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--color-gray);
  text-transform: uppercase;
}

.meta-line__item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.meta-line__item::before {
  content: "";
  width: 4px;
  height: 4px;
  background: var(--color-red);
}

/* ---------- 头部 ---------- */

.site-header {
  position: relative;
  background-color: var(--color-black);
  border-bottom: 1px solid var(--border-color);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--color-red);
  z-index: 90;
  pointer-events: none;
}

.site-header__deco {
  position: absolute;
  top: 0;
  right: 0;
  width: 260px;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.7;
  background:
    linear-gradient(115deg, transparent 0%, transparent 60%, rgba(255, 42, 42, 0.08) 60%, rgba(255, 42, 42, 0.08) 61%, transparent 61%),
    linear-gradient(115deg, transparent 0%, transparent 72%, rgba(0, 212, 255, 0.05) 72%, rgba(0, 212, 255, 0.05) 73%, transparent 73%);
}

.site-header__inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--site-width);
  margin-inline: auto;
  padding-inline: var(--site-gutter);
}

.site-header__top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-block: 10px;
  border-bottom: 1px solid rgba(192, 192, 192, 0.16);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-silver);
}

.site-header__edition {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.site-header__edition::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--color-red);
}

.site-header__slogan {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-silver);
}

.site-header__slogan::before {
  content: "◆";
  color: var(--color-green);
  font-size: 0.6rem;
  transform: rotate(10deg);
}

.site-header__masthead {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  padding-block: 24px 16px;
}

.site-header__brand {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
}

.site-header__brand-ch {
  font-family: var(--header-font);
  font-style: italic;
  font-weight: 900;
  text-transform: uppercase;
  font-size: clamp(2.4rem, 5vw, 4rem);
  line-height: 0.95;
  color: var(--color-white);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.site-header__brand-highlight {
  color: var(--color-red);
}

.site-header__brand-en {
  font-family: var(--header-font);
  font-style: normal;
  font-weight: 700;
  font-size: clamp(0.62rem, 1.2vw, 0.78rem);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-silver);
  opacity: 0.6;
}

.site-header__aside {
  display: flex;
  align-items: center;
  gap: 20px;
}

.site-header__issue {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-gray);
  border: 1px solid var(--border-color);
  padding: 6px 12px;
  white-space: nowrap;
}

/* 导航切换按钮 */

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-white);
  padding-block: 8px;
  transition: color 0.2s ease;
}

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

.nav-toggle__icon {
  display: inline-block;
  width: 22px;
}

.nav-toggle__icon span {
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform 0.3s var(--ease-out), opacity 0.3s ease;
}

.nav-toggle__icon span + span {
  margin-top: 5px;
}

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

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

.nav-toggle__text {
  line-height: 1;
}

/* 主导航（移动端默认隐藏，桌面展开） */

.site-nav {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 80;
  background: var(--color-black);
  border-top: 1px solid rgba(255, 42, 42, 0.28);
  border-bottom: 1px solid rgba(255, 42, 42, 0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
}

.site-nav[data-open] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  width: 100%;
}

.site-nav__list a {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  font-size: 1rem;
  font-weight: 600;
  color: rgba(245, 245, 245, 0.72);
  border-bottom: 1px solid rgba(192, 192, 192, 0.08);
  transition: color 0.25s ease, background 0.25s ease;
}

.site-nav__list li:last-child a {
  border-bottom: none;
}

.site-nav__list a:hover {
  color: var(--color-white);
}

.site-nav__list a[aria-current="page"] {
  color: var(--color-white);
  background: rgba(255, 42, 42, 0.06);
}

.site-nav__index {
  font-family: var(--header-font);
  font-size: 0.68rem;
  font-weight: 700;
  font-style: italic;
  letter-spacing: 0.06em;
  color: var(--color-red);
  display: none;
}

/* 阅读进度条 */

.site-header__progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: rgba(192, 192, 192, 0.1);
  z-index: 1000;
  pointer-events: none;
}

.site-header__progress span {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-red) 0%, var(--color-blue) 100%);
  box-shadow: 0 0 12px rgba(255, 42, 42, 0.6);
}

/* ---------- 页脚 ---------- */

.site-footer {
  margin-top: 80px;
  background: linear-gradient(180deg, #0d0d0d 0%, #050505 100%);
  border-top: 4px solid var(--color-red);
  position: relative;
  overflow: hidden;
  color: var(--color-silver);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 4px;
  right: 0;
  width: 180px;
  height: 3px;
  background: var(--color-blue);
  opacity: 0.7;
}

.site-footer__inner {
  max-width: var(--site-width);
  margin-inline: auto;
  padding: 48px var(--site-gutter) 24px;
}

.site-footer__topline {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 20px;
  flex-wrap: wrap;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border-color);
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-footer__brand-name {
  font-family: var(--header-font);
  font-weight: 900;
  font-style: italic;
  text-transform: uppercase;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1;
  color: var(--color-white);
  letter-spacing: 0.02em;
}

.site-footer__brand-name::after {
  content: "◈";
  color: var(--color-green);
  font-size: 0.5em;
  margin-left: 8px;
  vertical-align: middle;
}

.site-footer__brand-tagline {
  font-family: var(--header-font);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-red);
}

.site-footer__trust {
  max-width: 360px;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--color-gray);
  text-align: right;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1.4fr;
  gap: 40px;
  padding-block: 36px 28px;
}

.site-footer__heading {
  font-family: var(--header-font);
  font-weight: 800;
  font-style: italic;
  text-transform: uppercase;
  font-size: 1rem;
  letter-spacing: 0.12em;
  color: var(--color-white);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid rgba(255, 42, 42, 0.5);
}

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

.site-footer__linklist a {
  display: inline-block;
  position: relative;
  font-size: 0.85rem;
  color: var(--color-silver);
  padding-left: 14px;
  transition: color 0.2s ease, transform 0.2s ease;
}

.site-footer__linklist a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  background: var(--color-red);
  transform: translateY(-50%);
}

.site-footer__linklist a:hover {
  color: var(--color-white);
  transform: translateX(4px);
}

.site-footer__address {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--color-silver);
}

.site-footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  font-size: 0.75rem;
  color: var(--color-gray);
}

.site-footer__bottom p {
  margin: 0;
}

.site-footer__icp {
  letter-spacing: 0.04em;
}

/* ---------- 响应式断点 ---------- */

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    top: auto;
    z-index: auto;
    background: transparent;
    border-top: none;
    border-bottom: 1px solid var(--border-color);
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
    transition: none;
  }

  .site-nav__list {
    flex-direction: row;
    border-top: 1px solid rgba(192, 192, 192, 0.14);
    border-bottom: 1px solid rgba(192, 192, 192, 0.14);
    margin-inline: auto;
    max-width: var(--site-width);
    padding-inline: var(--site-gutter);
  }

  .site-nav__list a {
    justify-content: center;
    padding: 16px 10px 14px;
    font-size: 0.86rem;
    border-bottom: none;
  }

  .site-nav__list a + a {
    border-left: 1px solid rgba(192, 192, 192, 0.06);
  }

  .site-nav__list a::after {
    content: "";
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--color-red);
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 0.4s var(--ease-out);
  }

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

  .site-nav__list li {
    flex: 1;
  }
}

@media (min-width: 1024px) {
  .site-nav__index {
    display: inline;
  }
}

@media (max-width: 1023px) {
  .site-brand__en,
  .site-header__brand-en {
    display: none;
  }

  .site-nav__index {
    display: none;
  }

  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
}

@media (max-width: 767px) {
  .site-header__inner,
  .site-container,
  .site-footer__inner {
    padding-inline: 16px;
  }

  .site-header__issue {
    display: none;
  }

  .site-header__deco {
    opacity: 0.3;
  }

  .site-header__masthead {
    padding-block: 18px 12px;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .site-footer__topline {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-footer__trust {
    text-align: left;
    max-width: 100%;
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .section {
    padding-block: 40px;
  }
}

@media (max-width: 479px) {
  .site-header__slogan {
    display: none;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .site-nav__list a {
    font-size: 0.78rem;
    padding-inline: 4px;
  }
}

/* ---------- 减少动态偏好 ---------- */

@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;
  }
}