/* ==========================================================================
   上下分电玩 · /assets/site.css
   共享外壳：reset / 变量 / 排版 / 页头 / 页脚 / 通用组件
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
}

h1, h2, h3, h4, h5, p, figure, blockquote, ul, ol, dl, dd {
  margin: 0;
}

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

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

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

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

[hidden] { display: none !important; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 品牌色 */
  --ink: #0B0718;
  --ink-2: #1A1038;
  --violet: #7B4DFF;
  --cyan: #34E7E4;
  --orange: #FF8A3D;
  --wine: #8E1F45;
  --teal: #0E3B3A;
  --text: #F2EEFF;
  --muted: #A79FC9;
  --gold: #F5C86B;

  /* 线条与光晕 */
  --line-violet: rgba(123, 77, 255, 0.34);
  --line-cyan: rgba(52, 231, 228, 0.22);
  --line-muted: rgba(167, 159, 201, 0.18);
  --glow-violet: 0 0 18px rgba(123, 77, 255, 0.55);
  --glow-cyan: 0 0 22px rgba(52, 231, 228, 0.25);

  /* 尺寸 */
  --wrap: 1240px;
  --gutter: clamp(18px, 4vw, 40px);
  --cut: 24px 6px 24px 6px;
  --radius-pill: 999px;
  --ease: cubic-bezier(.22, .9, .3, 1);

  /* 字体 */
  --font-display: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", ui-monospace, "Cascadia Mono", Menlo, monospace;
}

/* ---------- 3. 基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  color: var(--text);
  background-color: var(--ink);
  background-image:
    radial-gradient(1200px 620px at 12% -12%, rgba(123, 77, 255, 0.20), transparent 62%),
    radial-gradient(900px 520px at 94% 6%, rgba(52, 231, 228, 0.10), transparent 66%),
    radial-gradient(760px 460px at 50% 118%, rgba(142, 31, 69, 0.16), transparent 70%);
  background-repeat: no-repeat;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

/* CRT 扫描线覆层 */
body::before {
  content: "";
  position: fixed;
  inset: -10% 0 0;
  z-index: 1;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(242, 238, 255, 0.035) 0 1px,
    transparent 1px 3px
  );
  animation: scan-drift 8s linear infinite;
}

main,
.site-header,
.site-footer { position: relative; }

main { z-index: 2; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.01em;
}

p + p { margin-top: 1.2em; }

strong { font-weight: 700; color: var(--cyan); }

code, .num {
  font-family: var(--font-mono);
  font-size: 0.9em;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

::selection {
  background: rgba(123, 77, 255, 0.55);
  color: var(--text);
}

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

/* ---------- 4. 跳至正文 ---------- */
.skip-link {
  position: fixed;
  top: -90px;
  left: 16px;
  z-index: 200;
  padding: 11px 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: #04211F;
  background: var(--cyan);
  border-radius: 0 0 12px 12px;
  transition: top 0.22s var(--ease);
}

.skip-link:focus {
  top: 0;
  outline: 2px solid var(--text);
  outline-offset: -4px;
}

/* ---------- 5. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(11, 7, 24, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-violet);
}

.brand-bar {
  position: relative;
}

.brand-bar::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(123, 77, 255, 0.85), rgba(52, 231, 228, 0.6), transparent);
  opacity: 0.75;
}

.brand-bar__inner,
.nav-bar__inner {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding-right: var(--gutter);
  padding-left: var(--gutter);
  display: flex;
  align-items: center;
}

.brand-bar__inner {
  min-height: 58px;
  gap: 16px;
  flex-wrap: nowrap;
}

.brand-sign {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: color 0.2s var(--ease);
}

.brand-sign:hover { color: var(--cyan); }

.brand-sign__mark {
  width: 22px;
  height: 22px;
  flex: 0 0 auto;
  background: linear-gradient(135deg, var(--violet) 0%, #4C7BFF 52%, var(--cyan) 100%);
  clip-path: polygon(0 0, 100% 0, 100% 58%, 58% 100%, 0 100%);
  box-shadow: var(--glow-violet);
}

.brand-sign__text {
  font-weight: 900;
}

.brand-tagline {
  flex: 0 0 auto;
  padding-left: 16px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
  border-left: 1px solid var(--line-muted);
  white-space: nowrap;
}

.status-chip {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  white-space: nowrap;
}

.status-dot {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(52, 231, 228, 0.16), 0 0 12px var(--cyan);
  animation: status-pulse 2.6s var(--ease) infinite;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--text);
  border: 1px solid rgba(123, 77, 255, 0.55);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

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

.nav-toggle[aria-expanded="true"] {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: var(--glow-cyan);
}

.nav-toggle__bars {
  width: 16px;
  height: 10px;
  background-image: repeating-linear-gradient(180deg, var(--cyan) 0 2px, transparent 2px 5px);
}

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

.nav-bar {
  border-top: 1px solid rgba(52, 231, 228, 0.12);
}

.nav-bar__inner {
  min-height: 52px;
}

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

.nav-item { display: block; }

.nav-link {
  position: relative;
  display: inline-block;
  padding: 10px 15px;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--muted);
  border-radius: 4px;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  right: 15px;
  bottom: 3px;
  left: 15px;
  height: 2px;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
  box-shadow: 0 0 10px rgba(123, 77, 255, 0.9);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.26s var(--ease);
}

.nav-link:hover {
  color: var(--text);
  background-color: rgba(123, 77, 255, 0.12);
}

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

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

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative;
  z-index: 2;
  margin-top: clamp(56px, 9vw, 120px);
  padding-top: clamp(48px, 7vw, 88px);
  padding-bottom: 26px;
  border-top: 1px solid var(--line-violet);
  background-color: #08050F;
  background-image:
    radial-gradient(90% 130% at 8% 0%, rgba(26, 16, 56, 0.95), transparent 62%),
    radial-gradient(70% 110% at 94% 100%, rgba(14, 59, 58, 0.55), transparent 66%);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(242, 238, 255, 0.08) 1px, transparent 1px);
  background-size: 22px 22px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.55), transparent 70%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.55), transparent 70%);
}

.footer-wrap {
  position: relative;
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding-right: var(--gutter);
  padding-left: var(--gutter);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 0.9fr 1.5fr 0.9fr;
  gap: clamp(28px, 4vw, 56px);
}

.footer-col {
  min-width: 0;
}

.footer-col--brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}

.footer-brand {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: 0.02em;
  color: var(--text);
  transition: color 0.2s var(--ease);
}

.footer-brand:hover { color: var(--cyan); }

.footer-tagline {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.footer-status {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.footer-title {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer-link {
  display: inline-block;
  font-size: 14.5px;
  color: var(--muted);
  transition: color 0.18s var(--ease), transform 0.18s var(--ease);
}

.footer-link:hover {
  color: var(--cyan);
  transform: translateX(3px);
}

.footer-list--contact { gap: 14px; }

.contact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.contact-label {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: rgba(167, 159, 201, 0.75);
  padding: 2px 8px;
  border: 1px solid var(--line-muted);
  border-radius: var(--radius-pill);
}

.contact-value {
  font-size: 14.5px;
  color: var(--text);
  word-break: break-all;
}

.contact-row--stack {
  align-items: flex-start;
}

.contact-row--stack .contact-value {
  flex: 1 1 100%;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.copy-btn {
  flex: 0 0 auto;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  border: 1px solid rgba(52, 231, 228, 0.4);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.copy-btn:hover {
  background-color: rgba(52, 231, 228, 0.14);
}

.copy-btn.is-copied {
  color: #04211F;
  background-color: var(--cyan);
  border-color: var(--cyan);
}

.footer-note {
  margin-top: 14px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: rgba(167, 159, 201, 0.8);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 28px;
  margin-top: clamp(36px, 5vw, 60px);
  padding-top: 20px;
  border-top: 1px solid var(--line-muted);
}

.footer-bottom__text {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(167, 159, 201, 0.78);
}

/* ---------- 7. 通用组件 ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin-right: auto;
  margin-left: auto;
  padding-right: var(--gutter);
  padding-left: var(--gutter);
}

.prose {
  max-width: 68ch;
}

.section {
  padding-top: clamp(52px, 7vw, 104px);
  padding-bottom: clamp(52px, 7vw, 104px);
}

.band-wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: clamp(36px, 5vw, 64px) auto;
  padding-right: var(--gutter);
  padding-left: var(--gutter);
}

.band {
  height: 3px;
  width: 100%;
  border-radius: var(--radius-pill);
  background-image: linear-gradient(90deg, transparent, rgba(123, 77, 255, 0.75), rgba(52, 231, 228, 0.7), rgba(255, 138, 61, 0.55), transparent);
  background-size: 200% 100%;
  animation: band-drift 20s linear infinite;
  opacity: 0.85;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
}

.display-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.6rem, 7vw, 5.5rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--text);
  text-shadow:
    0 0 1px rgba(123, 77, 255, 0.75),
    0 0 18px rgba(123, 77, 255, 0.5);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

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

.breadcrumb li + li::before {
  content: "/";
  color: rgba(167, 159, 201, 0.5);
}

.breadcrumb a {
  color: var(--muted);
  transition: color 0.18s var(--ease);
}

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

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 27px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.04em;
  line-height: 1.2;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: transform 0.22s var(--ease), box-shadow 0.22s var(--ease), border-color 0.22s var(--ease), color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.btn--primary {
  color: #220C00;
  background-color: var(--orange);
  box-shadow: 0 10px 30px rgba(255, 138, 61, 0.28);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px rgba(255, 138, 61, 0.42);
}

.btn--ghost {
  color: var(--text);
  background-color: rgba(123, 77, 255, 0.10);
  border-color: rgba(123, 77, 255, 0.55);
}

.btn--ghost:hover {
  color: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 1px rgba(52, 231, 228, 0.35), var(--glow-cyan);
}

.card {
  position: relative;
  padding: 24px 26px;
  border: 1px solid var(--line-violet);
  border-radius: var(--cut);
  background-image: linear-gradient(160deg, rgba(26, 16, 56, 0.92), rgba(11, 7, 24, 0.94));
  background-color: var(--ink);
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease), transform 0.25s var(--ease);
}

.card:hover {
  border-color: rgba(52, 231, 228, 0.6);
  box-shadow: 0 18px 44px rgba(11, 7, 24, 0.65), 0 0 32px rgba(52, 231, 228, 0.14);
  transform: translateY(-3px);
}

/* 响应式图片容器 */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  isolation: isolate;
  aspect-ratio: 4 / 3;
  border-radius: var(--cut);
  background-color: var(--ink-2);
  background-image:
    radial-gradient(120% 100% at 18% 0%, rgba(123, 77, 255, 0.42), transparent 68%),
    radial-gradient(90% 90% at 100% 100%, rgba(52, 231, 228, 0.20), transparent 70%);
}

.media-frame img,
.media-frame svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(180deg, rgba(11, 7, 24, 0.24) 0 1px, transparent 1px 4px);
}

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }

.media-frame[data-tone="wine"] {
  background-image:
    radial-gradient(120% 100% at 18% 0%, rgba(142, 31, 69, 0.72), transparent 70%),
    radial-gradient(80% 80% at 100% 100%, rgba(255, 138, 61, 0.20), transparent 72%);
}

.media-frame[data-tone="teal"] {
  background-image:
    radial-gradient(120% 100% at 18% 0%, rgba(14, 59, 58, 0.95), transparent 70%),
    radial-gradient(80% 80% at 100% 100%, rgba(52, 231, 228, 0.26), transparent 72%);
}

.media-frame[data-tone="cyan"] {
  background-image:
    radial-gradient(120% 100% at 18% 0%, rgba(52, 231, 228, 0.30), transparent 70%),
    radial-gradient(80% 80% at 100% 100%, rgba(123, 77, 255, 0.42), transparent 72%);
}

/* 显现 */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.38s var(--ease), transform 0.38s var(--ease);
  will-change: opacity, transform;
}

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

/* 滚动进度条（JS 注入） */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 90;
  width: 100%;
  height: 2px;
  pointer-events: none;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-image: linear-gradient(90deg, var(--violet), var(--cyan) 55%, var(--orange));
  box-shadow: 0 0 12px rgba(52, 231, 228, 0.45);
}

/* ---------- 8. 关键帧 ---------- */
@keyframes scan-drift {
  from { transform: translateY(0); }
  to { transform: translateY(24px); }
}

@keyframes band-drift {
  from { background-position: 0% 50%; }
  to { background-position: 200% 50%; }
}

@keyframes status-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(0.82); }
}

/* ---------- 9. 响应式 ---------- */
@media (max-width: 1080px) {
  .footer-grid {
    grid-template-columns: 1.4fr 1fr;
    row-gap: 40px;
  }
}

@media (max-width: 900px) {
  body { font-size: 16px; }

  .brand-bar__inner {
    min-height: 54px;
    gap: 12px;
  }

  .brand-tagline { display: none; }

  .status-chip { font-size: 11.5px; letter-spacing: 0.04em; }

  .nav-toggle { display: inline-flex; flex: 0 0 auto; }

  .nav-bar {
    border-top: 1px solid rgba(52, 231, 228, 0.10);
  }

  .nav-bar__inner {
    display: block;
    min-height: 0;
    padding-right: 12px;
    padding-left: 12px;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    gap: 0;
    padding: 6px 0 12px;
  }

  [data-nav][data-open] .nav-list {
    display: flex;
  }

  .nav-item { width: 100%; }

  .nav-link {
    display: block;
    width: 100%;
    padding: 13px 12px;
    font-size: 15px;
    border-bottom: 1px solid rgba(167, 159, 201, 0.12);
  }

  .nav-link::after { display: none; }

  .nav-link:hover { background-color: rgba(123, 77, 255, 0.14); }

  .nav-link[aria-current="page"] {
    color: var(--cyan);
    background-color: rgba(52, 231, 228, 0.08);
  }
}

@media (max-width: 640px) {
  .brand-sign { font-size: 16px; }
  .brand-sign__mark { width: 19px; height: 19px; }

  .status-chip {
    font-size: 11px;
    letter-spacing: 0;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    row-gap: 34px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .contact-row { gap: 6px; }

  .contact-value { font-size: 14px; }
}

@media (max-width: 380px) {
  .status-chip { display: none; }
}

/* ---------- 10. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.12s !important;
  }

  body::before { animation: none; opacity: 0.5; }

  .band { animation: none; background-position: 50% 50%; }

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

  .card:hover,
  .btn:hover,
  .footer-link:hover { transform: none; }
}