/* ===== 变量与基础 ===== */
:root {
  --color-paper: #F5F0E6;
  --color-ink: #1A1A1A;
  --color-neon: #39FF14;
  --color-orange: #FF6B35;
  --color-panel: #E8E2D6;
  --color-muted: #444444;
  --color-blue: #2D6CDF;
  --color-purple: #7B61FF;
  --color-amber: #FFD166;
  --color-dark: #2A2A2A;
  --color-navy: #0A1628;
  --font-title: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-data: 'Roboto Mono', 'SF Mono', Consolas, monospace;
  --content-max: 1200px;
  --scroll-progress: 0%;
}

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

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

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-ink);
  background: var(--color-paper);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

main {
  display: block;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-title);
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-ink);
}

p {
  margin-bottom: 1rem;
}

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

ul, ol {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

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

code {
  font-family: var(--font-data);
  font-size: 0.9em;
  background: var(--color-panel);
  padding: 0.15em 0.4em;
  border-radius: 5px;
}

hr {
  border: none;
  border-top: 2px dashed rgba(26, 26, 26, 0.18);
  margin: 3rem 0;
}

::selection {
  background: var(--color-neon);
  color: var(--color-ink);
}

:focus-visible {
  outline: 3px solid var(--color-neon);
  outline-offset: 2px;
  border-radius: 6px;
}

@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;
  }
}

/* ===== 通用工具 ===== */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: 200;
  background: var(--color-neon);
  color: var(--color-ink);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.65rem 1.2rem;
  border-radius: 0 0 10px 10px;
  transition: top 0.2s ease;
}

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

.skip-link:focus-visible {
  outline-offset: 0;
}

/* ===== 布局容器 ===== */
.content-shell {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 2rem;
}

.section-block {
  padding: 4.5rem 0;
}

.section-block--tight {
  padding: 2rem 0;
}

.section-block--tint {
  background: var(--color-panel);
}

.section-block--dark {
  background: var(--color-ink);
  color: var(--color-paper);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1.5rem;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

@media (max-width: 980px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 640px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

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

/* ===== 标题组 ===== */
.section-heading {
  max-width: 720px;
  margin-bottom: 2.25rem;
}

.section-heading--center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-heading__kicker {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.7rem;
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-blue);
}

.section-heading--center .section-heading__kicker {
  justify-content: center;
}

.section-heading__kicker::before {
  content: "";
  flex: none;
  width: 26px;
  height: 4px;
  border-radius: 2px;
  background: var(--color-orange);
}

.section-heading__title {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.02em;
  line-height: 1.12;
  color: var(--color-ink);
}

.section-heading__desc {
  margin-top: 0.85rem;
  max-width: 60ch;
  color: var(--color-muted);
  font-size: 1.02rem;
}

.section-heading--center .section-heading__desc {
  margin-left: auto;
  margin-right: auto;
}

.section-block--dark .section-heading__title {
  color: var(--color-paper);
}

.section-block--dark .section-heading__desc {
  color: rgba(245, 240, 230, 0.65);
}

/* ===== 正文排版 ===== */
.prose {
  max-width: 68ch;
  font-size: 1.02rem;
}

.prose p {
  margin-bottom: 1.1rem;
}

.prose a {
  color: var(--color-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(45, 108, 223, 0.3);
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

.prose a:hover {
  color: var(--color-orange);
  text-decoration-color: var(--color-orange);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.9rem;
  border-radius: 999px;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 0.98rem;
  line-height: 1;
  letter-spacing: 0.02em;
  border: 2px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0) scale(0.98);
}

.btn--primary {
  background: var(--color-neon);
  color: var(--color-ink);
  box-shadow: 0 5px 18px rgba(57, 255, 20, 0.22);
}

.btn--primary:hover {
  box-shadow: 0 9px 26px rgba(57, 255, 20, 0.32);
}

.btn--ghost {
  background: transparent;
  color: var(--color-ink);
  border-color: rgba(26, 26, 26, 0.35);
}

.btn--ghost:hover {
  border-color: var(--color-orange);
  color: var(--color-orange);
  box-shadow: 0 6px 18px rgba(255, 107, 53, 0.14);
}

/* ===== 标签 ===== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.28rem 0.85rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.4;
  background: rgba(255, 107, 53, 0.1);
  color: var(--color-orange);
  border: 1px solid rgba(255, 107, 53, 0.4);
}

.tag--blue {
  background: rgba(45, 108, 223, 0.08);
  color: var(--color-blue);
  border-color: rgba(45, 108, 223, 0.35);
}

.tag--neon {
  background: rgba(57, 255, 20, 0.1);
  color: #158f08;
  border-color: rgba(57, 255, 20, 0.45);
}

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 1.5rem;
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--color-muted);
}

.breadcrumb a[href] {
  color: var(--color-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(26, 26, 26, 0.25);
}

.breadcrumb a[href]:hover {
  color: var(--color-orange);
  text-decoration-color: var(--color-orange);
}

.breadcrumb__sep {
  color: rgba(26, 26, 26, 0.3);
}

.breadcrumb__current {
  color: var(--color-orange);
}

/* ===== 资料卡 ===== */
.card {
  background: var(--color-panel);
  border: 1px solid rgba(26, 26, 26, 0.06);
  border-radius: 18px;
  padding: 1.9rem;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 14px 30px rgba(26, 26, 26, 0.12);
}

.card--accent {
  border-top: 4px solid var(--color-orange);
}

.card__title {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1.2rem;
  line-height: 1.3;
  margin-bottom: 0.7rem;
  color: var(--color-ink);
}

.card__body {
  font-size: 0.95rem;
  color: var(--color-muted);
}

/* ===== 数据组件 ===== */
.data-pair {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.data-value {
  font-family: var(--font-data);
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.data-value--neon {
  color: #169908;
}

.data-label {
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.section-block--dark .data-value {
  color: var(--color-paper);
}

.section-block--dark .data-value--neon {
  color: var(--color-neon);
}

.section-block--dark .data-label {
  color: rgba(245, 240, 230, 0.5);
}

.data-tape {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.8rem;
  padding: 0.9rem 1.5rem;
  background: var(--color-ink);
  border-left: 6px solid var(--color-neon);
  border-radius: 0 12px 12px 0;
  color: rgba(245, 240, 230, 0.78);
  font-family: var(--font-data);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
}

.data-tape__item {
  white-space: nowrap;
}

.data-tape__item::before {
  content: "// ";
  color: var(--color-orange);
  font-weight: 700;
}

/* ===== 图片骨架 ===== */
.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: 16px;
  background: var(--color-panel);
  aspect-ratio: 16 / 10;
}

.media-frame--wide {
  aspect-ratio: 21 / 9;
}

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

.media-frame--portrait {
  aspect-ratio: 4 / 5;
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.media-frame:hover img {
  transform: scale(1.02);
}

.media-frame__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-muted);
}

/* ===== 页头 ===== */
.site-header {
  position: relative;
  z-index: 50;
  background: var(--color-navy);
  color: var(--color-paper);
  border-top: 4px solid var(--color-neon);
  overflow: hidden;
}

.site-header::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -8%;
  width: 34%;
  height: 140%;
  background: linear-gradient(160deg, rgba(45, 108, 223, 0.32), rgba(123, 97, 255, 0.08) 70%);
  transform: skewX(-18deg);
  transform-origin: top right;
  pointer-events: none;
}

.site-header::after {
  content: "";
  position: fixed;
  top: 4px;
  left: 0;
  z-index: 120;
  height: 3px;
  width: var(--scroll-progress, 0%);
  background: linear-gradient(90deg, var(--color-orange), var(--color-blue));
  pointer-events: none;
}

.site-header__inner {
  position: relative;
  z-index: 1;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 2.6rem 2rem 1.4rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.site-header__brand {
  text-align: center;
}

.site-header__logo {
  display: inline-block;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--color-paper);
  padding-bottom: 0.08em;
}

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

.site-header__subtitle {
  margin-top: 0.45rem;
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: rgba(245, 240, 230, 0.6);
}

.site-header__subtitle::after {
  content: "_";
  margin-left: 0.3rem;
  color: var(--color-neon);
  animation: datablink 1.4s step-end infinite;
}

@keyframes datablink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.3rem;
}

.site-nav__item {
  display: inline-flex;
}

.site-nav__link {
  display: inline-block;
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 0.98rem;
  letter-spacing: 0.02em;
  color: rgba(245, 240, 230, 0.85);
  transition: color 0.2s ease, background-color 0.2s ease, transform 0.1s ease;
}

.site-nav__link:hover {
  color: var(--color-neon);
  background: rgba(245, 240, 230, 0.07);
}

.site-nav__link:active {
  transform: scale(0.97);
}

.site-nav__link[aria-current="page"] {
  background: var(--color-paper);
  color: var(--color-navy);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.22);
}

.nav-toggle {
  display: none;
  position: relative;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 46px;
  height: 46px;
  border: 2px solid rgba(245, 240, 230, 0.35);
  border-radius: 10px;
  background: transparent;
  flex: none;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.nav-toggle:hover,
.nav-toggle[data-open] {
  border-color: var(--color-neon);
  background: rgba(57, 255, 20, 0.08);
}

.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-paper);
  transition: transform 0.25s ease, opacity 0.2s ease;
}

.nav-toggle[data-open] .nav-toggle__bar:nth-child(2) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[data-open] .nav-toggle__bar:nth-child(3) {
  opacity: 0;
}

.nav-toggle[data-open] .nav-toggle__bar:nth-child(4) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== 页脚 ===== */
.site-footer {
  position: relative;
  margin-top: 5rem;
  background: var(--color-navy);
  color: var(--color-paper);
  border-top: 4px solid var(--color-neon);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: -6%;
  width: 32%;
  height: 100%;
  background: linear-gradient(200deg, rgba(45, 108, 223, 0.28), rgba(123, 97, 255, 0.06));
  transform: skewX(-16deg);
  transform-origin: bottom left;
  pointer-events: none;
}

.site-footer::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(245, 240, 230, 0.07) 1px, transparent 1px);
  background-size: 26px 26px;
  pointer-events: none;
}

.site-footer__inner {
  position: relative;
  z-index: 1;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 4rem 2rem 2.5rem;
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr;
  gap: 3.5rem;
}

.site-footer__col {
  min-width: 0;
}

.site-footer__col--brand {
  max-width: 100%;
}

.site-footer__logo {
  display: inline-block;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 2.1rem;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-paper);
  margin-bottom: 1rem;
}

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

.site-footer__desc {
  max-width: 42ch;
  font-size: 0.95rem;
  color: rgba(245, 240, 230, 0.7);
  margin-bottom: 0.9rem;
}

.site-footer__trust {
  max-width: 52ch;
  font-size: 0.82rem;
  line-height: 1.7;
  color: rgba(245, 240, 230, 0.48);
  border-left: 3px solid var(--color-orange);
  padding-left: 1rem;
}

.site-footer__title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1.25rem;
  font-family: var(--font-data);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-neon);
}

.site-footer__title::before {
  content: "";
  width: 20px;
  height: 3px;
  border-radius: 2px;
  background: var(--color-orange);
}

.site-footer__list li {
  margin-bottom: 0.65rem;
}

.site-footer__link {
  font-size: 0.95rem;
  color: rgba(245, 240, 230, 0.72);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-bottom-color 0.2s ease;
}

.site-footer__link:hover {
  color: var(--color-neon);
  border-bottom-color: var(--color-neon);
}

.site-footer__contact-item {
  font-size: 0.9rem;
  color: rgba(245, 240, 230, 0.72);
  padding-left: 1rem;
  border-left: 2px solid rgba(123, 97, 255, 0.45);
}

.site-footer__bar {
  position: relative;
  z-index: 1;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 1.1rem 2rem 1.4rem;
  border-top: 1px solid rgba(245, 240, 230, 0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.7rem 1.5rem;
}

.site-footer__copyright,
.site-footer__icp {
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: rgba(245, 240, 230, 0.5);
}

.site-footer__icp {
  padding: 0.25rem 0.8rem;
  border: 1px solid rgba(245, 240, 230, 0.18);
  border-radius: 999px;
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }

  .site-footer__col--brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding-top: 3rem;
  }

  .site-footer__col--brand {
    grid-column: auto;
  }

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

@media (max-width: 860px) {
  .site-header__inner {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 0 1rem;
    padding: 1rem 1.25rem 0.75rem;
  }

  .site-header__brand {
    grid-column: 1;
    grid-row: 1;
    text-align: left;
    justify-self: start;
  }

  .site-header__logo {
    font-size: 1.5rem;
  }

  .site-header__subtitle {
    font-size: 0.62rem;
    letter-spacing: 0.14em;
  }

  .nav-toggle {
    display: flex;
    grid-column: 2;
    grid-row: 1;
    justify-self: end;
  }

  .site-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    display: none;
    width: 100%;
    margin-top: 0.75rem;
  }

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

  .site-nav__list {
    flex-direction: column;
    gap: 0;
    border-top: 1px solid rgba(245, 240, 230, 0.14);
  }

  .site-nav__item {
    display: flex;
  }

  .site-nav__link {
    display: block;
    width: 100%;
    padding: 0.9rem 0.5rem;
    border-radius: 0;
    border-bottom: 1px solid rgba(245, 240, 230, 0.08);
    font-size: 1rem;
  }

  .site-nav__link[aria-current="page"] {
    background: transparent;
    color: var(--color-neon);
    border-left: 3px solid var(--color-orange);
    padding-left: 1.1rem;
    box-shadow: none;
  }

  .site-header::after {
    top: 3px;
  }
}