/* =========================================================
   EBET易博中心 · 共享样式表  /assets/site.css
   堆叠面板档案体系 · 深墨蓝 / 电光青 / 品牌金橙
   ========================================================= */

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

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

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, blockquote, dl, dd, fieldset {
  margin: 0;
}

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

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

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

button { background: none; border: 0; cursor: pointer; }

table { border-collapse: collapse; width: 100%; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  /* 色彩体系 */
  --ink-abyss: #07101F;
  --ink-deep: #0C1A2E;
  --ink-panel: #132743;
  --ink-line: #23405F;
  --cyan-signal: #35E3D2;
  --cyan-mist: #8FF3EA;
  --amber-mark: #FF9F2E;
  --amber-soft: #FFD08A;
  --paper: #E9F1F8;
  --slate-muted: #93A7BF;
  --violet-depth: #4C6BF0;

  /* 字体 */
  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, serif;
  --font-body: Inter, "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 尺度 */
  --wrap: 1200px;
  --wrap-narrow: 880px;
  --gutter: 24px;
  --stack-offset: 24px;
  --cut: 22px;
  --radius: 3px;

  --shadow-panel: 0 16px 34px rgba(3, 9, 20, .45);
  --shadow-cut: drop-shadow(0 16px 30px rgba(3, 9, 20, .5));

  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 3. 基础排版（中文语境） ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink-deep);
  background-image:
    radial-gradient(920px 520px at 88% -8%, rgba(53, 227, 210, .10), transparent 62%),
    radial-gradient(760px 460px at 4% 2%, rgba(76, 107, 240, .13), transparent 60%),
    linear-gradient(180deg, var(--ink-abyss) 0%, var(--ink-deep) 46%, #0A1626 100%);
  background-repeat: no-repeat;
  background-attachment: scroll;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--paper);
  text-wrap: balance;
}

h1 { font-size: clamp(30px, 4.2vw, 44px); line-height: 1.2; margin-bottom: .55em; }
h2 { font-size: clamp(24px, 2.9vw, 30px); line-height: 1.32; margin-bottom: .62em; }
h3 { font-size: 20px; font-weight: 600; line-height: 1.42; margin-bottom: .7em; }
h4 { font-size: 17px; font-weight: 600; line-height: 1.5; margin-bottom: .7em; }

p { margin-bottom: 1.05em; text-wrap: pretty; }

a { color: var(--cyan-mist); text-decoration: none; transition: color .18s var(--ease); }
a:hover { color: var(--paper); }

strong, b { font-weight: 600; color: var(--paper); }

::selection { background: rgba(53, 227, 210, .28); color: var(--paper); }

/* 统一焦点反馈 */
:focus-visible {
  outline: 2px solid var(--amber-mark);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---------- 4. 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: -72px;
  left: 18px;
  z-index: 200;
  padding: 11px 20px;
  background: var(--amber-mark);
  color: #1A1002;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  border-radius: var(--radius);
  transition: top .2s var(--ease);
}
.skip-link:focus {
  top: 16px;
  color: #1A1002;
  outline-color: var(--paper);
}

/* ---------- 5. 居中刊头 · 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: linear-gradient(180deg, rgba(7, 16, 31, .97) 0%, rgba(12, 26, 46, .95) 100%);
  border-bottom: 1px solid var(--ink-line);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.site-header::after {
  content: "";
  display: block;
  height: 2px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--cyan-signal) 20%,
    var(--violet-depth) 50%,
    var(--amber-mark) 80%,
    transparent 100%);
  opacity: .68;
}

.site-header__inner {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 20px var(--gutter) 0;
  transition: padding .28s var(--ease);
}

.site-header.is-condensed .site-header__inner { padding-top: 8px; }

/* 报头 */
.masthead {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
}

.masthead__brand {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  text-align: center;
  color: var(--paper);
}

.masthead__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 2.6vw, 31px);
  line-height: 1.1;
  letter-spacing: .015em;
  color: var(--paper);
  transition: font-size .28s var(--ease);
}

.masthead__note {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: .2em;
  color: var(--cyan-signal);
  white-space: nowrap;
}

.masthead__brand:hover .masthead__name { color: var(--cyan-mist); }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  padding: 9px 13px;
  border: 1px solid var(--ink-line);
  border-radius: var(--radius);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .14em;
  transition: border-color .18s var(--ease), background-color .18s var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan-signal); background: rgba(53, 227, 210, .08); }

.nav-toggle__mark {
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
  width: 16px;
  height: 11px;
}
.nav-toggle__mark span {
  display: block;
  height: 1.5px;
  width: 100%;
  background: var(--cyan-signal);
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__mark span:nth-child(1) {
  transform: translateY(4.75px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__mark span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__mark span:nth-child(3) {
  transform: translateY(-4.75px) rotate(-45deg);
}

/* 主导航 */
.primary-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-top: 12px;
  padding-bottom: 14px;
  transition: margin .28s var(--ease), padding .28s var(--ease);
}

.primary-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2px;
}

.primary-nav__list a {
  position: relative;
  display: block;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--slate-muted);
  letter-spacing: .02em;
  transition: color .18s var(--ease);
}

.primary-nav__list a::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 2px;
  background: var(--cyan-signal);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform .22s var(--ease);
}

.primary-nav__list a:hover { color: var(--paper); }
.primary-nav__list a:hover::after,
.primary-nav__list a:focus-visible::after,
.primary-nav__list a[aria-current="page"]::after { transform: scaleX(1); }
.primary-nav__list a[aria-current="page"] { color: var(--paper); }
.primary-nav__list a:focus-visible { outline-offset: -1px; }

.primary-nav__cta { flex: 0 0 auto; }

/* 收拢状态（桌面） */
@media (min-width: 900px) {
  .site-header.is-condensed .site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding-bottom: 8px;
  }
  .site-header.is-condensed .masthead { justify-content: flex-start; min-height: 0; }
  .site-header.is-condensed .masthead__brand {
    flex-direction: row;
    align-items: baseline;
    gap: 12px;
  }
  .site-header.is-condensed .masthead__name { font-size: 20px; }
  .site-header.is-condensed .masthead__note { letter-spacing: .16em; }
  .site-header.is-condensed .primary-nav {
    margin-top: 0;
    padding-bottom: 0;
    gap: 10px;
  }
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: .02em;
  text-align: center;
  color: var(--paper);
  cursor: pointer;
  transition: background-color .2s var(--ease), color .2s var(--ease),
              border-color .2s var(--ease), transform .2s var(--ease);
}

.btn--amber {
  background: var(--amber-mark);
  border-color: var(--amber-mark);
  color: #1A1002;
}
.btn--amber:hover {
  background: var(--amber-soft);
  border-color: var(--amber-soft);
  color: #1A1002;
  transform: translateY(-2px);
}

.btn--cyan {
  background: transparent;
  border-color: var(--cyan-signal);
  color: var(--cyan-mist);
}
.btn--cyan:hover {
  background: rgba(53, 227, 210, .12);
  border-color: var(--cyan-mist);
  color: var(--paper);
}

.btn--ghost {
  background: transparent;
  border-color: var(--ink-line);
  color: var(--slate-muted);
}
.btn--ghost:hover {
  border-color: var(--cyan-signal);
  color: var(--paper);
}

.btn--sm { padding: 9px 16px; font-size: 13px; }
.btn--block { display: flex; width: 100%; }

/* ---------- 7. 容器与正文骨架 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.wrap--narrow { max-width: var(--wrap-narrow); }

.section { padding: 56px 0; }
.section + .section { border-top: 1px solid var(--ink-line); }
.section__head { margin-bottom: 32px; max-width: 720px; }

.eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .22em;
  color: var(--cyan-signal);
}

.lede {
  font-size: 17px;
  line-height: 1.85;
  color: var(--slate-muted);
  max-width: 62ch;
}

.label-mono {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .14em;
  color: var(--cyan-signal);
}

.doc {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 44px;
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 44px var(--gutter) 0;
  align-items: start;
}

.doc__aside {
  position: sticky;
  top: 132px;
  align-self: start;
}

.doc__body { min-width: 0; max-width: var(--wrap-narrow); }

.anchor-nav {
  border-left: 1px solid var(--ink-line);
  padding-left: 4px;
}

.anchor-nav__title {
  margin: 0 0 12px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .2em;
  color: var(--slate-muted);
}

.anchor-nav a {
  display: block;
  padding: 9px 14px;
  border-left: 2px solid transparent;
  font-size: 14px;
  color: var(--slate-muted);
  transition: color .18s var(--ease), border-color .18s var(--ease),
              background-color .18s var(--ease);
}
.anchor-nav a:hover {
  color: var(--paper);
  background: rgba(53, 227, 210, .06);
}
.anchor-nav a[aria-current="true"] {
  color: var(--cyan-signal);
  border-left-color: var(--cyan-signal);
  background: rgba(53, 227, 210, .07);
}

/* ---------- 8. 面包屑 ---------- */
.breadcrumbs {
  padding: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--slate-muted);
}
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.breadcrumbs li { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumbs li + li::before {
  content: "/";
  color: var(--ink-line);
}
.breadcrumbs a { color: var(--slate-muted); }
.breadcrumbs a:hover { color: var(--cyan-signal); }
.breadcrumbs [aria-current="page"] { color: var(--paper); }

/* ---------- 9. 堆叠面板 ---------- */
.panel {
  position: relative;
  background: var(--ink-panel);
  border: 1px solid var(--ink-line);
  border-radius: var(--radius);
}

.panel--cut {
  border: 0;
  border-radius: 0;
  background: var(--ink-panel);
  clip-path: polygon(
    0 0,
    calc(100% - var(--cut)) 0,
    100% var(--cut),
    100% 100%,
    0 100%
  );
  filter: var(--shadow-cut);
}

.panel--cut-bl {
  border: 0;
  border-radius: 0;
  background: var(--ink-panel);
  clip-path: polygon(
    0 0,
    100% 0,
    100% 100%,
    var(--cut) 100%,
    0 calc(100% - var(--cut))
  );
  filter: var(--shadow-cut);
}

.panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--ink-line);
}

.panel__body { padding: 24px; }

.stack {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.stack--offset > * + * { margin-left: var(--stack-offset); }

/* 面板悬浮层次 */
.panel:hover {
  border-color: var(--cyan-signal);
}

/* ---------- 10. 栅格 ---------- */
.grid {
  display: grid;
  gap: var(--gutter);
}
.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)); }

@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

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

@media (max-width: 620px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .stack--offset > * + * { margin-left: 12px; }
}

/* ---------- 11. 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--ink-panel) 0%, var(--ink-abyss) 100%);
  border: 1px solid var(--ink-line);
  clip-path: polygon(
    0 0,
    calc(100% - var(--cut)) 0,
    100% var(--cut),
    100% 100%,
    0 100%
  );
}

.media-frame img,
.media-frame picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 4 / 5; }

.media-frame--texture::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(115deg,
      rgba(53, 227, 210, .07) 0 1px,
      transparent 1px 10px);
  mix-blend-mode: screen;
}

.media-frame__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--slate-muted);
}

/* ---------- 12. 显现动画 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .4s var(--ease), transform .4s var(--ease);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}
html:not(.js) [data-reveal] {
  opacity: 1;
  transform: none;
}

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 72px;
  background: linear-gradient(180deg, var(--ink-deep) 0%, var(--ink-abyss) 100%);
  border-top: 1px solid var(--ink-line);
  color: var(--slate-muted);
}

.site-footer::before {
  content: "";
  display: block;
  height: 2px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--cyan-signal) 16%,
    var(--violet-depth) 50%,
    var(--amber-mark) 84%,
    transparent 100%);
  opacity: .6;
}

.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, .8fr) minmax(0, .8fr) minmax(0, 1.55fr);
  gap: 36px;
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 52px var(--gutter) 36px;
}

.footer-brand { max-width: 34ch; }

.footer-brand__line {
  margin: 0;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.75;
  letter-spacing: .01em;
  color: var(--paper);
}

.footer-col__title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .22em;
  color: var(--cyan-signal);
}

.footer-col__list li { margin-bottom: 10px; }

.footer-col__list a {
  display: inline-block;
  font-size: 14px;
  color: var(--slate-muted);
  transition: color .18s var(--ease), transform .18s var(--ease);
}
.footer-col__list a:hover {
  color: var(--paper);
  transform: translateX(3px);
}

.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 10px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--paper);
}

.footer-contact__key {
  flex: 0 0 auto;
  min-width: 42px;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .14em;
  color: var(--cyan-signal);
}

.footer-col__note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--ink-line);
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--slate-muted);
}

.site-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 18px var(--gutter) 30px;
  border-top: 1px solid var(--ink-line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--slate-muted);
}

.site-footer__icp { color: var(--slate-muted); }
.site-footer__year { color: var(--slate-muted); }
.site-footer__year [data-year] { color: var(--amber-soft); }

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1080px) {
  .site-footer__inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px;
  }
}

@media (max-width: 980px) {
  .doc {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
    padding-top: 32px;
  }
  .doc__aside {
    position: static;
    top: auto;
  }
  .anchor-nav {
    border-left: 0;
    border-top: 1px solid var(--ink-line);
    padding: 14px 0 0;
  }
  .anchor-nav__title { margin-left: 0; }
  .anchor-nav a { border-left: 0; border-bottom: 2px solid transparent; }
  .anchor-nav a[aria-current="true"] {
    border-left-color: transparent;
    border-bottom-color: var(--cyan-signal);
  }
}

@media (max-width: 899px) {
  .nav-toggle { display: inline-flex; }

  .site-header__inner { padding-top: 16px; }

  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 88;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    margin: 0;
    padding: 16px var(--gutter) 22px;
    max-height: 76vh;
    overflow-y: auto;
    background: linear-gradient(180deg, var(--ink-deep) 0%, var(--ink-abyss) 100%);
    border-bottom: 1px solid var(--ink-line);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s;
  }

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

  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .primary-nav__list a {
    padding: 13px 4px;
    font-size: 15px;
    border-bottom: 1px solid var(--ink-line);
  }

  .primary-nav__list a::after {
    left: 4px;
    right: auto;
    width: 26px;
    bottom: -2px;
  }

  .primary-nav__cta {
    width: 100%;
    margin-top: 14px;
  }

  .section { padding: 44px 0; }
}

@media (max-width: 620px) {
  :root { --gutter: 18px; --stack-offset: 14px; --cut: 16px; }

  .site-footer__inner {
    grid-template-columns: minmax(0, 1fr);
    padding-top: 40px;
    gap: 28px;
  }

  .site-footer__base { padding-bottom: 26px; }

  .panel__head { padding: 16px 18px 12px; }
  .panel__body { padding: 18px; }

  .masthead__note { letter-spacing: .14em; font-size: 10px; }
}

/* ---------- 15. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

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

  .btn--amber:hover,
  .footer-col__list a:hover {
    transform: none;
  }
}