/* ==========================================================================
   大发彩票中心 · 共享站点样式 /assets/site.css
   视觉基底：技术蓝图网格 · 深空蓝 + 暗金锚点 · 等宽制表数字
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 96px;
}

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

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

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

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

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

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

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

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 色彩 */
  --c-deep: #0A1A33;
  --c-midnight: #050E1C;
  --c-line: #16304F;
  --c-gold: #C9A227;
  --c-gold-bright: #F2CE5A;
  --c-cyan: #35E0D0;
  --c-magenta: #FF4D8D;
  --c-paper: #F4F7FB;
  --c-text: #D5DFEC;
  --c-graphite: #8FA3BA;
  --c-linen: #F6F1E4;

  /* 字体 */
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei",
    system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, "SF Mono", Menlo,
    Consolas, "Courier New", monospace;

  /* 度量 */
  --wrap: 1220px;
  --gutter: clamp(18px, 4vw, 44px);
  --measure: 68ch;

  /* 形状 */
  --radius-s: 2px;
  --radius-m: 4px;
  --radius-l: 18px;

  /* 动效 */
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --dur: 200ms;

  /* 层次 */
  --z-header: 60;
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100%;
  background-color: var(--c-deep);
  background-image:
    linear-gradient(rgba(22, 48, 79, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22, 48, 79, 0.3) 1px, transparent 1px);
  background-size: 96px 96px;
  color: var(--c-text);
  font-family: var(--font-sans);
  font-size: 16.5px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  color: var(--c-paper);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -0.01em;
}

h1 { font-weight: 900; letter-spacing: -0.02em; }

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

::selection {
  background: var(--c-gold);
  color: var(--c-midnight);
}

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

/* ---------- 4. 工具类 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.005em;
}

.skip-link {
  position: absolute;
  left: 50%;
  top: 6px;
  z-index: 200;
  padding: 10px 20px;
  background: var(--c-gold);
  color: var(--c-midnight);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: var(--radius-m);
  transform: translate(-50%, -200%);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translate(-50%, 0);
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.72em 1.3em;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  background: transparent;
  color: var(--c-paper);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.03em;
  white-space: nowrap;
  transition:
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

.btn:hover,
.btn:focus-visible {
  border-color: var(--c-gold);
  color: var(--c-gold-bright);
}

.btn--gold {
  color: var(--c-gold);
  border-color: var(--c-gold);
}

.btn--gold:hover,
.btn--gold:focus-visible {
  background: var(--c-gold-bright);
  border-color: var(--c-gold-bright);
  color: var(--c-midnight);
}

/* ---------- 6. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: var(--c-deep);
  border-bottom: 1px solid var(--c-line);
  isolation: isolate;
}

/* 6.1 顶部工具条 */
.header-toolbar {
  max-height: 48px;
  overflow: hidden;
  background: var(--c-midnight);
  border-bottom: 1px solid rgba(22, 48, 79, 0.85);
  transition: max-height var(--dur) var(--ease), opacity 160ms var(--ease);
}

.site-header.is-stuck .header-toolbar {
  max-height: 0;
  opacity: 0;
}

.header-toolbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 47px;
  font-size: 12.5px;
  color: var(--c-graphite);
}

.header-toolbar__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  color: var(--c-graphite);
  white-space: nowrap;
}

.header-toolbar__meta .mono {
  font-size: 12px;
  letter-spacing: 0.04em;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-toolbar__sep {
  display: block;
  flex: none;
  width: 1px;
  height: 12px;
  background: var(--c-line);
}

.header-toolbar__note {
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--c-graphite);
}

.header-toolbar__pulse {
  display: block;
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 0 3px rgba(53, 224, 208, 0.14);
}

/* 6.2 居中报头 */
.header-masthead {
  padding: 26px 0 20px;
  transition: padding var(--dur) var(--ease);
}

.site-header.is-stuck .header-masthead { padding: 9px 0; }

.header-masthead__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 7px;
  text-align: center;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
}

.brand__mark {
  display: inline-block;
  padding: 3px 7px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-s);
  color: var(--c-gold);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
  line-height: 1.2;
  transform: translateY(-0.22em);
  transition: font-size var(--dur) var(--ease);
}

.brand__name {
  color: var(--c-paper);
  font-size: clamp(1.45rem, 3.4vw, 2.45rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 0.03em;
  transition: font-size var(--dur) var(--ease);
}

.site-header.is-stuck .brand__name { font-size: 1.2rem; }
.site-header.is-stuck .brand__mark { font-size: 10px; }

.header-masthead__line {
  max-height: 30px;
  overflow: hidden;
  color: var(--c-graphite);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  transition: opacity 160ms var(--ease), max-height var(--dur) var(--ease);
}

.site-header.is-stuck .header-masthead__line {
  max-height: 0;
  opacity: 0;
}

/* 6.3 刊头导航 */
.header-nav {
  position: relative;
  border-top: 1px solid var(--c-line);
}

.header-nav__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 54px;
}

.site-nav { display: block; }

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 2.2vw, 32px);
}

.site-nav__item { position: relative; }

.site-nav__link {
  position: relative;
  display: block;
  padding: 15px 4px 13px;
  border-bottom: 2px solid transparent;
  color: var(--c-graphite);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--c-gold-bright);
  border-bottom-color: var(--c-gold);
}

.site-nav__link[aria-current="page"] {
  color: var(--c-paper);
  border-bottom-color: var(--c-gold);
}

.site-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 4px;
  bottom: -1px;
  width: 5px;
  height: 5px;
  background: var(--c-gold-bright);
  transform: translateY(2px);
}

.header-cta {
  position: absolute;
  right: var(--gutter);
  top: 50%;
  transform: translateY(-50%);
  font-size: 13px;
  padding: 0.64em 1.1em;
}

/* 6.4 汉堡按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 2px;
  color: var(--c-graphite);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  transition: color 160ms var(--ease);
}

.nav-toggle:hover { color: var(--c-gold-bright); }

.nav-toggle__bars {
  display: inline-grid;
  gap: 4px;
  width: 20px;
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 180ms var(--ease), opacity 140ms var(--ease);
}

.site-header[data-open] .nav-toggle__bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header[data-open] .nav-toggle__bar:nth-child(2) { opacity: 0; }

.site-header[data-open] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* 6.5 滚动进度线 */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  z-index: 2;
  width: 100%;
  height: 2px;
  background: var(--c-gold);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 90ms linear;
  pointer-events: none;
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  margin-top: clamp(56px, 8vw, 112px);
  background: var(--c-midnight);
  border-top: 1px solid var(--c-line);
  color: var(--c-graphite);
  font-size: 14px;
}

.site-footer__inner {
  padding-top: clamp(46px, 6vw, 78px);
  padding-bottom: 26px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(4, minmax(0, 1fr));
  gap: 40px 30px;
  padding-bottom: 42px;
  border-bottom: 1px solid var(--c-line);
}

.brand--footer .brand__name { font-size: 1.3rem; }
.brand--footer .brand__mark { font-size: 10px; }

.footer-brand__note {
  max-width: 30em;
  margin-top: 14px;
  color: var(--c-graphite);
  font-size: 13px;
  line-height: 1.85;
}

.footer-col__title {
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(22, 48, 79, 0.9);
  color: var(--c-gold);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.2em;
}

.footer-col__list {
  display: grid;
  gap: 9px;
}

.footer-col__link {
  display: inline-block;
  color: var(--c-graphite);
  font-size: 13.5px;
  transition: color 160ms var(--ease), padding-left 160ms var(--ease);
}

.footer-col__link:hover,
.footer-col__link:focus-visible {
  color: var(--c-gold-bright);
  padding-left: 5px;
}

.footer-contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 16px 32px;
  padding: 30px 0;
  border-bottom: 1px solid var(--c-line);
}

.footer-contact__item {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  min-width: 0;
}

.footer-contact__item--wide { grid-column: 1 / -1; }

.footer-contact__label {
  flex: none;
  padding: 2px 6px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-s);
  color: var(--c-graphite);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  line-height: 1.5;
}

.footer-contact__value {
  min-width: 0;
  color: var(--c-paper);
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: 0.01em;
  overflow-wrap: anywhere;
}

.footer-contact__value--addr { letter-spacing: 0.02em; }

.copy-btn {
  flex: none;
  padding: 3px 8px;
  border: 1px solid rgba(201, 162, 39, 0.45);
  border-radius: var(--radius-s);
  color: var(--c-gold);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  transition:
    background-color 160ms var(--ease),
    border-color 160ms var(--ease),
    color 160ms var(--ease);
}

.copy-btn:hover,
.copy-btn:focus-visible {
  background: var(--c-gold);
  border-color: var(--c-gold);
  color: var(--c-midnight);
}

.copy-btn[data-copied] {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  color: var(--c-midnight);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 26px;
  padding-top: 22px;
  color: var(--c-graphite);
  font-size: 12.5px;
}

.footer-bottom__text {
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer-legal__link {
  color: var(--c-graphite);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  transition: color 160ms var(--ease);
}

.footer-legal__link:hover,
.footer-legal__link:focus-visible { color: var(--c-gold-bright); }

/* ---------- 8. 面包屑 ---------- */
.breadcrumb { padding-top: 22px; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  color: var(--c-graphite);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

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

.breadcrumb__item::after {
  content: "/";
  color: var(--c-line);
}

.breadcrumb__item:last-child::after { content: none; }

.breadcrumb__link {
  color: var(--c-graphite);
  transition: color 160ms var(--ease);
}

.breadcrumb__link:hover,
.breadcrumb__link:focus-visible { color: var(--c-gold-bright); }

.breadcrumb__current { color: var(--c-gold); }

/* ---------- 9. 正文容器与章节 ---------- */
.lede {
  max-width: 44em;
  color: var(--c-paper);
  font-size: clamp(1.02rem, 1.6vw, 1.22rem);
  font-weight: 400;
  line-height: 1.75;
}

.prose { max-width: var(--measure); }

.prose > * + * { margin-top: 1.15em; }

.prose p { color: var(--c-text); }

.prose h2 { margin-top: 1.8em; font-size: clamp(1.2rem, 1.9vw, 1.6rem); }

.prose h3 { margin-top: 1.5em; font-size: 1.12rem; }

.prose ul,
.prose ol {
  padding-left: 1.35em;
  color: var(--c-text);
}

.prose li + li { margin-top: 0.45em; }

.prose a {
  color: var(--c-gold-bright);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
  text-decoration-color: rgba(201, 162, 39, 0.5);
  transition: text-decoration-color 160ms var(--ease);
}

.prose a:hover { text-decoration-color: var(--c-gold-bright); }

.section { padding-block: clamp(38px, 5.5vw, 76px); }

.section + .section { border-top: 1px solid var(--c-line); }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  margin-bottom: 26px;
}

.section__index {
  color: var(--c-gold);
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
}

.section__title {
  color: var(--c-paper);
  font-size: clamp(1.25rem, 2vw, 1.75rem);
  font-weight: 700;
  line-height: 1.3;
}

.section__desc {
  flex: 1 1 240px;
  color: var(--c-graphite);
  font-size: 13.5px;
  line-height: 1.7;
}

/* ---------- 10. 网格与基础组件 ---------- */
.blueprint-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 22px;
}

.card {
  position: relative;
  padding: 22px 22px 24px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m) var(--radius-l) var(--radius-m) var(--radius-m);
  background: linear-gradient(180deg, rgba(22, 48, 79, 0.42), rgba(10, 26, 51, 0.18));
  transition:
    border-color 180ms var(--ease),
    background-color 180ms var(--ease),
    transform 180ms var(--ease);
}

.card:hover,
.card:focus-within { border-color: var(--c-gold); }

.tag {
  display: inline-block;
  padding: 4px 9px;
  border: 1px solid rgba(53, 224, 208, 0.42);
  border-radius: var(--radius-s);
  color: var(--c-cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  line-height: 1.4;
}

.tag--gold {
  color: var(--c-gold);
  border-color: rgba(201, 162, 39, 0.48);
}

.tag--magenta {
  color: var(--c-magenta);
  border-color: rgba(255, 77, 141, 0.48);
}

.stat {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.stat__label {
  color: var(--c-graphite);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
}

.stat__value {
  color: var(--c-paper);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.45rem, 2.6vw, 2.1rem);
  font-weight: 700;
  line-height: 1.1;
}

.stat__unit {
  margin-left: 0.35em;
  color: var(--c-graphite);
  font-size: 0.5em;
  font-weight: 400;
  letter-spacing: 0.12em;
}

/* ---------- 11. 图片容器（页面阶段复用） ---------- */
.figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m) var(--radius-l) var(--radius-m) var(--radius-m);
  background: var(--c-midnight);
  overflow: hidden;
}

.figure__media {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: var(--ratio, 16 / 9);
  object-fit: cover;
}

.figure__caption {
  padding: 10px 14px;
  border-top: 1px solid var(--c-line);
  color: var(--c-graphite);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.figure--blueprint::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(22, 48, 79, 0.7) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22, 48, 79, 0.7) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.5;
  pointer-events: none;
}

.ratio-21x9 { --ratio: 21 / 9; }
.ratio-16x9 { --ratio: 16 / 9; }
.ratio-4x3  { --ratio: 4 / 3; }
.ratio-3x4  { --ratio: 3 / 4; }
.ratio-1x1  { --ratio: 1 / 1; }

/* ---------- 12. 响应式 ---------- */
@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 980px) {
  .site-nav__link { font-size: 14px; letter-spacing: 0.02em; }
  .header-cta { font-size: 12px; padding: 0.58em 0.9em; }
}

@media (max-width: 920px) {
  .header-nav__inner {
    justify-content: space-between;
    gap: 12px;
  }

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 5;
    display: none;
    padding: 6px var(--gutter) 20px;
    background: var(--c-midnight);
    border-top: 1px solid var(--c-line);
    border-bottom: 1px solid var(--c-line);
  }

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

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

  .site-nav__link {
    padding: 13px 2px;
    border-bottom: 1px solid rgba(22, 48, 79, 0.65);
    font-size: 15px;
  }

  .site-nav__item:last-child .site-nav__link { border-bottom: 0; }

  .site-nav__link[aria-current="page"]::before {
    left: 0;
    bottom: auto;
    top: 50%;
    transform: translateY(-50%);
    margin-left: -10px;
  }

  .header-cta {
    position: static;
    transform: none;
    font-size: 12px;
    padding: 0.58em 0.9em;
  }

  .blueprint-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  .header-toolbar__note,
  .header-toolbar__sep { display: none; }

  .header-toolbar__meta:last-child { display: none; }

  .footer-bottom { justify-content: flex-start; }
}

@media (max-width: 560px) {
  body { font-size: 16px; }

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

  .footer-grid { grid-template-columns: 1fr; gap: 30px; }

  .header-masthead__line { letter-spacing: 0.1em; }

  .header-cta { font-size: 11.5px; padding: 0.5em 0.75em; }
}

/* ---------- 13. 动效偏好 ---------- */
@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;
  }

  .scroll-progress { transition: none; }
}