/* ============================================================
   DB CN · 真人对接游艺 — 共享样式表 /assets/site.css
   结构：reset → 变量 → 中文排版 → 工具类 → 通用组件
        → 页头 → 页脚 → 响应式 → 减少动态
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 132px;
}

body,
h1,
h2,
h3,
h4,
p,
figure,
ul,
ol,
dl,
dd,
blockquote {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
}

a {
  color: inherit;
  text-decoration: none;
  transition:
    color var(--dur) ease,
    border-color var(--dur) ease,
    background-color var(--dur) ease;
}

/* ---------- 变量 ---------- */
:root {
  --ink: #070b10;
  --panel: #0e1720;
  --band: #0a1118;
  --cyan: #19f5d0;
  --cyan-soft: #8afff0;
  --amber: #ffb23e;
  --amber-soft: #ffd98a;
  --text: #eafdfa;
  --muted: #9cb7b8;
  --line: #21424c;
  --on-cyan: #04140f;

  --r-card: 28px;
  --r-soft: 20px;
  --r-matrix: 8px;
  --pill: 999px;

  --wrap: 1240px;
  --gutter: clamp(18px, 4vw, 48px);
  --gap: clamp(16px, 2vw, 28px);

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas,
    monospace;

  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --dur: 160ms;
}

/* ---------- 中文排版与页面底 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(circle at 12% -8%, rgba(25, 245, 208, 0.09), transparent 52%),
    radial-gradient(circle at 92% 4%, rgba(255, 178, 62, 0.06), transparent 40%),
    repeating-linear-gradient(
      180deg,
      rgba(234, 253, 250, 0.018) 0 1px,
      transparent 1px 4px
    );
  color: var(--text);
  font-family: var(--font-sans);
  font-size: clamp(16px, 0.35vw + 15px, 17.5px);
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4 {
  color: var(--text);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.015em;
}

h1 {
  font-size: clamp(40px, 5vw, 72px);
}

h2 {
  font-size: clamp(28px, 3.4vw, 52px);
}

h3 {
  font-size: clamp(22px, 2.2vw, 32px);
  line-height: 1.28;
}

h4 {
  font-size: clamp(18px, 1.4vw, 21px);
  line-height: 1.4;
  letter-spacing: 0;
}

::selection {
  background: var(--cyan);
  color: var(--on-cyan);
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 工具类 ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.container--narrow {
  max-width: 820px;
}

.section {
  padding-block: clamp(56px, 7vw, 104px);
}

.section--tight {
  padding-block: clamp(36px, 4vw, 60px);
}

.sr-only {
  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;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2em;
}

.eyebrow::before {
  content: "";
  display: block;
  width: 26px;
  height: 1px;
  background: var(--amber);
}

.section-title {
  margin-bottom: 14px;
  font-size: clamp(28px, 3.4vw, 52px);
}

.section-lead {
  max-width: 60ch;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.8;
}

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  gap: var(--gap);
}

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

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

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

.grid--12 {
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55em;
  min-height: 48px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: var(--pill);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-align: center;
  transition:
    background-color var(--dur) ease,
    border-color var(--dur) ease,
    color var(--dur) ease;
}

.btn--primary {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--on-cyan);
}

.btn--primary:hover {
  background: var(--cyan-soft);
  border-color: var(--cyan-soft);
}

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

.btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan-soft);
  background: rgba(25, 245, 208, 0.06);
}

/* ---------- 标签胶囊 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  padding: 0.34em 0.8em;
  border: 1px solid rgba(25, 245, 208, 0.28);
  border-radius: var(--pill);
  background: rgba(25, 245, 208, 0.05);
  color: var(--cyan-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.tag--amber {
  border-color: rgba(255, 178, 62, 0.35);
  background: rgba(255, 178, 62, 0.07);
  color: var(--amber-soft);
}

.tag--ghost {
  border-color: var(--line);
  background: transparent;
  color: var(--muted);
}

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  padding: clamp(20px, 2.4vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: var(--panel);
  transition:
    border-color var(--dur) ease,
    background-color var(--dur) ease;
}

.card:hover {
  border-color: rgba(25, 245, 208, 0.55);
  background-color: #101e28;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(18px, 2.4vw, 28px);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--line);
}

.breadcrumb a {
  color: var(--muted);
}

.breadcrumb a:hover {
  color: var(--cyan);
}

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

/* ---------- 正文容器 ---------- */
.prose {
  max-width: 72ch;
}

.prose p {
  margin: 0 0 1.15em;
}

.prose ul,
.prose ol {
  margin: 0 0 1.15em;
  padding-left: 1.35em;
}

.prose ul {
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin: 0.35em 0;
}

.prose h2,
.prose h3 {
  margin: 1.6em 0 0.6em;
}

.prose h2 {
  font-size: clamp(24px, 2.4vw, 34px);
}

.prose h3 {
  font-size: clamp(20px, 1.8vw, 24px);
}

.prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(25, 245, 208, 0.45);
}

.prose a:hover {
  color: var(--cyan-soft);
  border-bottom-color: var(--cyan-soft);
}

.prose strong {
  color: var(--text);
  font-weight: 700;
}

.prose blockquote {
  margin: 1.4em 0;
  padding: 12px 0 12px 20px;
  border-left: 2px solid var(--amber);
  color: var(--muted);
}

.prose code {
  padding: 0.12em 0.45em;
  border: 1px solid rgba(25, 245, 208, 0.18);
  border-radius: 6px;
  background: rgba(25, 245, 208, 0.09);
  color: var(--cyan-soft);
  font-family: var(--font-mono);
  font-size: 0.92em;
}

/* ---------- 图片容器基础 ---------- */
.media-frame {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
  border-radius: var(--r-soft);
  background:
    linear-gradient(150deg, rgba(25, 245, 208, 0.08), transparent 45%),
    linear-gradient(320deg, rgba(255, 178, 62, 0.07), transparent 50%),
    var(--panel);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(234, 253, 250, 0.16) 1px, transparent 1px);
  background-size: 16px 16px;
  opacity: 0.22;
  pointer-events: none;
}

.media-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.media-frame--square {
  aspect-ratio: 1 / 1;
  border-radius: var(--r-matrix);
}

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

/* ---------- 显现 ---------- */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 0.5s ease,
    transform 0.5s var(--ease);
}

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

[data-spy] a[aria-current="location"] {
  color: var(--cyan);
}

/* ============================================================
   页头
   ============================================================ */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 10px 16px;
  border-radius: var(--pill);
  background: var(--cyan);
  color: var(--on-cyan);
  font-size: 14px;
  font-weight: 700;
  transform: translateY(-180%);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus {
  transform: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(10, 17, 24, 0.95);
  border-bottom: 1px solid var(--line);
  color: var(--text);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.header-rail {
  height: 3px;
  background: repeating-linear-gradient(
    90deg,
    var(--cyan) 0 28px,
    transparent 28px 40px,
    var(--amber) 40px 52px,
    transparent 52px 96px
  );
  opacity: 0.85;
}

.header-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.header-brand-row {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 14px 0 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-height: 44px;
}

.brand-mark {
  color: var(--text);
  font-family: var(--font-mono);
  font-size: clamp(20px, 2vw, 25px);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1;
}

.brand-mark-dot {
  color: var(--cyan);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

.brand-name {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.3;
}

.brand-desc {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.3;
}

.header-meta {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
}

.meta-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(25, 245, 208, 0.12);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: rgba(25, 245, 208, 0.06);
  color: var(--text);
  cursor: pointer;
  transition:
    border-color var(--dur) ease,
    background-color var(--dur) ease;
}

.nav-toggle:hover {
  border-color: var(--cyan);
  background: rgba(25, 245, 208, 0.12);
}

.nav-toggle-bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

.nav-toggle-bars i {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transition:
    transform var(--dur) var(--ease),
    opacity var(--dur) ease;
}

.site-header[data-open] .nav-toggle-bars i:first-child {
  transform: translateY(3px) rotate(45deg);
}

.site-header[data-open] .nav-toggle-bars i:last-child {
  transform: translateY(-3px) rotate(-45deg);
}

.nav-toggle-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.header-nav-row {
  display: flex;
  align-items: center;
  gap: 16px;
  border-top: 1px solid var(--line);
}

.nav-index-tag {
  padding-right: 14px;
  border-right: 1px solid var(--line);
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
}

.primary-nav {
  flex: 1 1 auto;
  min-width: 0;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 14px;
  border-bottom: 2px solid transparent;
  color: var(--text);
  font-size: 15px;
  font-weight: 500;
  white-space: nowrap;
}

.nav-num {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  transition: color var(--dur) ease;
}

.nav-link:hover {
  border-bottom-color: rgba(25, 245, 208, 0.45);
  background: rgba(25, 245, 208, 0.05);
  color: var(--cyan-soft);
}

.nav-link:hover .nav-num {
  color: var(--cyan);
}

.nav-link[aria-current="page"] {
  border-bottom-color: var(--cyan);
  color: var(--cyan);
}

.nav-link[aria-current="page"] .nav-num {
  color: var(--amber);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid rgba(255, 178, 62, 0.45);
  border-radius: var(--pill);
  color: var(--amber-soft);
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
  transition:
    background-color var(--dur) ease,
    border-color var(--dur) ease,
    color var(--dur) ease;
}

.header-cta:hover {
  border-color: var(--amber);
  background: rgba(255, 178, 62, 0.12);
  color: var(--amber);
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: clamp(56px, 8vw, 120px);
  border-top: 1px solid var(--line);
  background: var(--band);
  color: var(--text);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 52%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(25, 245, 208, 0.1), transparent 65%);
  pointer-events: none;
}

.footer-inner {
  position: relative;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(40px, 5vw, 64px) var(--gutter) 28px;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(250px, 1fr) 1.6fr;
  gap: clamp(28px, 5vw, 64px);
}

.footer-mark {
  color: var(--text);
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
}

.footer-mark span {
  color: var(--cyan);
}

.footer-brand-line {
  margin-top: 14px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.footer-note {
  max-width: 34ch;
  margin-top: 10px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.footer-hours {
  display: inline-flex;
  align-items: center;
  margin-top: 16px;
  padding: 6px 14px;
  border: 1px solid rgba(255, 178, 62, 0.35);
  border-radius: var(--pill);
  color: var(--amber-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}

.footer-col-title {
  margin-bottom: 14px;
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  line-height: 1.4;
}

.footer-links {
  display: grid;
  gap: 2px;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  border-bottom: 1px solid transparent;
  color: var(--text);
  font-size: 14.5px;
}

.footer-link:hover {
  border-bottom-color: rgba(25, 245, 208, 0.5);
  color: var(--cyan);
}

.footer-contact-band {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px 32px;
  margin-top: clamp(30px, 4vw, 48px);
  padding-top: clamp(24px, 3vw, 32px);
  border-top: 1px solid var(--line);
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.contact-key {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
}

.contact-value {
  color: var(--text);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.6;
  overflow-wrap: anywhere;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  margin-top: clamp(26px, 4vw, 40px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.legal-copy {
  color: var(--muted);
}

.legal-icp {
  color: var(--cyan-soft);
}

.legal-note {
  color: var(--muted);
}

.legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-left: auto;
}

.legal-links a {
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.legal-links a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1080px) {
  .nav-link {
    padding: 14px 10px;
    font-size: 14px;
  }

  .nav-index-tag {
    padding-right: 10px;
  }
}

@media (max-width: 920px) {
  html {
    scroll-padding-top: 96px;
  }

  .header-meta {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .header-nav-row {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: block;
    padding: 14px var(--gutter) 24px;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    background: var(--band);
    max-height: calc(100dvh - 96px);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition:
      opacity var(--dur) ease,
      transform var(--dur) var(--ease),
      visibility var(--dur) ease;
  }

  .site-header[data-open] .header-nav-row {
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
  }

  .nav-index-tag {
    display: none;
  }

  .primary-nav {
    display: block;
  }

  .nav-list {
    display: block;
  }

  .nav-list li + li {
    border-top: 1px solid rgba(33, 66, 76, 0.5);
  }

  .nav-link {
    width: 100%;
    padding: 14px 6px;
    border-bottom: 0;
    border-left: 2px solid transparent;
    font-size: 15px;
  }

  .nav-link:hover {
    border-bottom: 0;
    border-left-color: rgba(25, 245, 208, 0.45);
    background: rgba(25, 245, 208, 0.06);
  }

  .nav-link[aria-current="page"] {
    border-bottom: 0;
    border-left-color: var(--cyan);
    padding-left: 14px;
    background: rgba(25, 245, 208, 0.07);
  }

  .header-cta {
    display: flex;
    width: fit-content;
    margin-top: 16px;
  }

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

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

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

  .legal-links {
    margin-left: 0;
    width: 100%;
  }
}

@media (max-width: 900px) {
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .grid--2,
  .grid--3,
  .grid--4,
  .grid--12 {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .footer-contact-band {
    grid-template-columns: minmax(0, 1fr);
  }

  .brand-text {
    padding-left: 12px;
  }

  .brand-desc {
    font-size: 10px;
    letter-spacing: 0.06em;
  }

  .btn {
    width: 100%;
  }
}

@media (max-width: 420px) {
  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .brand-name {
    font-size: 14px;
  }
}

/* ============================================================
   减少动态
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

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

  .header-nav-row,
  .nav-toggle-bars i,
  .skip-link {
    transition: none;
  }
}