/* ============================================================
   万博娱乐 · 共享样式表 /assets/site.css
   纸张白 × 墨黑 × 电竞蓝 × 活力橙 · 极简文字建筑
   ============================================================ */

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

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

body { margin: 0; }

h1, h2, h3, h4, h5, h6, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }
table { border-collapse: collapse; }

/* ---------- 2. 设计变量 ---------- */
:root {
  --paper: #F7F5EF;
  --ink: #0B0D12;
  --ink-soft: #4A5162;
  --blue: #0E2A5A;
  --orange: #FF6A1A;
  --violet: #8B5CF6;
  --teal: #2DD4BF;
  --teal-deep: #12897C;
  --mist: #D9D6CC;
  --warm: #EFE9DA;
  --deep: #151A24;

  --font-display: "Noto Serif SC", "Songti SC", "Source Han Serif SC", Georgia, "Times New Roman", serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-num: "Inter", "Helvetica Neue", Arial, sans-serif;

  --wrap: 1240px;
  --gutter: clamp(16px, 4vw, 40px);
  --line: 1px solid var(--ink);
  --line-soft: 1px solid var(--mist);
  --shadow-card: 0 1px 0 rgba(11, 13, 18, .05), 0 12px 28px -24px rgba(11, 13, 18, .85);
}

/* ---------- 3. 基础排版 ---------- */
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: clamp(16px, 1.05vw, 17px);
  font-weight: 400;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: .01em;
}
h1 { font-size: clamp(32px, 5vw, 54px); }
h2 { font-size: clamp(23px, 3vw, 32px); }
h3 { font-size: clamp(19px, 2vw, 24px); }
h4 { font-size: clamp(17px, 1.6vw, 19px); }

strong, b { font-weight: 700; }

:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 3px;
}

#main-content {
  display: block;
  scroll-margin-top: 132px;
  outline: none;
}

/* ---------- 4. 工具类 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding-inline: var(--gutter);
}
.wrap--narrow { max-width: 860px; }

.section { padding-block: clamp(30px, 5vw, 62px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px 24px;
  padding-bottom: 12px;
  border-bottom: var(--line);
  margin-bottom: clamp(16px, 2.6vw, 26px);
}
.section-kicker {
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 6px;
}
.section-title { margin: 0; }

.prose {
  max-width: 68ch;
  line-height: 1.82;
}
.prose p { margin-bottom: 1.35em; }
.prose h2 { margin: 1.8em 0 .6em; }
.prose h3 { margin: 1.5em 0 .5em; }
.prose ul, .prose ol { margin: 0 0 1.4em; padding-left: 1.3em; list-style: disc; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: .45em; }

.grid {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
}
.grid--two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--workbench {
  grid-template-columns: minmax(180px, 220px) minmax(0, 1fr) minmax(220px, 280px);
  align-items: start;
}

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 12px;
  top: -80px;
  z-index: 200;
  padding: 12px 20px;
  background: var(--ink);
  color: var(--paper);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .1em;
  text-decoration: none;
  border: 2px solid var(--orange);
  transition: top .2s ease;
}
.skip-link:focus { top: 12px; }

/* ---------- 6. 站点头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background:
    linear-gradient(180deg, rgba(14, 42, 90, .07), rgba(247, 245, 239, 0) 64%),
    var(--paper);
}

.header-rule {
  height: 5px;
  background:
    repeating-linear-gradient(90deg, var(--orange) 0 2px, transparent 2px 14px),
    var(--paper);
  border-bottom: 1px solid rgba(11, 13, 18, .18);
}

.masthead {
  position: relative;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 14px var(--gutter) 6px;
}

.masthead__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px 20px;
  position: relative;
}

.masthead__meta {
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .32em;
  text-transform: uppercase;
  color: var(--ink-soft);
  white-space: nowrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  justify-self: center;
  text-decoration: none;
  color: var(--ink);
}
.brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: none;
  background: var(--orange);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1;
}
.brand__name {
  font-family: var(--font-display);
  font-size: clamp(28px, 4.4vw, 44px);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: .02em;
}
.brand__sub {
  align-self: flex-end;
  padding-bottom: 5px;
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .28em;
  color: var(--ink-soft);
  white-space: nowrap;
}

.header-utility {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
  justify-self: end;
}
.utility-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--ink);
  text-decoration: none;
  background: rgba(14, 42, 90, .05);
  border: 1px solid var(--mist);
  transition: border-color .25s ease, background-color .25s ease, color .25s ease;
}
.utility-link:hover,
.utility-link:focus-visible {
  border-color: var(--ink);
  background: rgba(14, 42, 90, .12);
}
.utility-link--apple {
  border-color: var(--orange);
  background: rgba(255, 106, 26, .14);
}
.utility-link--apple:hover,
.utility-link--apple:focus-visible {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}
.utility-link__dot {
  width: 6px;
  height: 6px;
  flex: none;
  border-radius: 50%;
  background: var(--teal-deep);
}

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: var(--ink);
  border: 1px solid var(--ink);
  cursor: pointer;
}
.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--paper);
  transition: transform .25s ease, opacity .25s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 7. 导航带 ---------- */
.site-nav {
  background: linear-gradient(100deg, var(--blue) 0%, var(--deep) 54%, #11305F 100%);
  border-bottom: 1px solid var(--ink);
  box-shadow: inset 0 1px 0 rgba(247, 245, 239, .16);
}
.nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.nav-item { display: flex; }
.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px clamp(10px, 1.8vw, 20px);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .18em;
  color: rgba(247, 245, 239, .84);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  background: linear-gradient(180deg, rgba(255, 106, 26, 0), rgba(255, 106, 26, 0));
  transition: color .25s ease, background-color .25s ease, border-color .25s ease;
}
.nav-link__index {
  font-family: var(--font-num);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .06em;
  color: rgba(247, 245, 239, .45);
  transition: color .25s ease;
}
.nav-link:hover,
.nav-link:focus-visible {
  color: #FFFFFF;
  border-bottom-color: var(--orange);
  background: linear-gradient(180deg, rgba(255, 106, 26, .22), rgba(255, 106, 26, 0));
}
.nav-link:hover .nav-link__index,
.nav-link:focus-visible .nav-link__index { color: var(--orange); }

.nav-link[aria-current="page"] {
  color: #FFFFFF;
  border-bottom-color: var(--orange);
  background: linear-gradient(180deg, rgba(255, 106, 26, .28), rgba(255, 106, 26, 0));
}
.nav-link[aria-current="page"] .nav-link__index { color: var(--orange); }

/* ---------- 8. 站点页脚 ---------- */
.site-footer {
  margin-top: clamp(48px, 7vw, 92px);
  background: linear-gradient(180deg, var(--deep) 0%, #10141C 100%);
  color: var(--paper);
  border-top: 3px solid var(--ink);
  box-shadow: inset 0 4px 0 -1px var(--orange);
}
.footer-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(28px, 4vw, 44px) var(--gutter) 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
}
.footer-line1 {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 34px;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(247, 245, 239, .18);
}
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}
.footer-brand__mark {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  background: var(--orange);
  color: var(--ink);
  font-size: 15px;
  line-height: 1;
}
.footer-brand__sub {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .26em;
  color: rgba(247, 245, 239, .56);
}
.footer-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
}
.footer-fact {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13px;
  color: rgba(247, 245, 239, .82);
}
.footer-fact__key {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .22em;
  color: var(--teal);
  white-space: nowrap;
}
.footer-fact__val { color: rgba(247, 245, 239, .82); }

.footer-link {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid rgba(247, 245, 239, .32);
  transition: color .2s ease, border-color .2s ease;
}
.footer-link:hover,
.footer-link:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.footer-line2 {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px 28px;
  padding-bottom: 22px;
  border-bottom: 1px solid rgba(247, 245, 239, .18);
}
.footer-apple {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  background: var(--orange);
  border: 1px solid var(--orange);
  color: var(--ink);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .06em;
  text-decoration: none;
  transition: background-color .25s ease, color .25s ease;
}
.footer-apple:hover,
.footer-apple:focus-visible {
  background: transparent;
  color: var(--orange);
}
.footer-apple__label {
  padding-right: 10px;
  border-right: 1px solid currentColor;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: .2em;
  opacity: .78;
}
.footer-apple__text { white-space: nowrap; }

.footer-note {
  font-size: 13px;
  line-height: 1.65;
  color: rgba(247, 245, 239, .72);
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: 12px;
  letter-spacing: .14em;
}
.footer-legal__item { display: inline-flex; }

.footer-base {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 16px var(--gutter) clamp(20px, 3vw, 28px);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
}
.footer-copy {
  font-size: 12px;
  letter-spacing: .1em;
  color: rgba(247, 245, 239, .58);
}

/* ---------- 9. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5em;
  padding: 13px 22px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .1em;
  line-height: 1;
  text-decoration: none;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--ink);
  cursor: pointer;
  transition: background-color .25s ease, color .25s ease, border-color .25s ease;
}
.btn:hover,
.btn:focus-visible {
  background: var(--ink);
  color: var(--paper);
}
.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}
.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}
.btn--ghost {
  background: transparent;
  border-color: var(--mist);
  color: var(--ink);
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: transparent;
  border-color: var(--ink);
  color: var(--ink);
}

/* ---------- 10. 面包屑 ---------- */
.breadcrumb { margin-bottom: clamp(16px, 2.6vw, 26px); }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--ink-soft);
}
.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--mist);
}
.breadcrumb__link {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease, color .2s ease;
}
.breadcrumb__link:hover,
.breadcrumb__link:focus-visible {
  border-bottom-color: var(--orange);
  color: var(--orange);
}

/* ---------- 11. 卡片与标签 ---------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(16px, 2vw, 22px);
  background: #FFFFFF;
  border: var(--line-soft);
  box-shadow: var(--shadow-card);
  transition: border-color .25s ease, box-shadow .25s ease;
}
.card:hover {
  border-color: var(--ink);
  box-shadow: 0 14px 30px -24px rgba(11, 13, 18, .95);
}
.card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}
.card__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
}
.card__meta {
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  white-space: nowrap;
}
.card__body {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--ink);
  background: var(--warm);
  border: 1px solid var(--ink);
  white-space: nowrap;
}
.tag--orange { background: rgba(255, 106, 26, .16); border-color: var(--orange); }
.tag--violet { background: rgba(139, 92, 246, .14); border-color: var(--violet); }
.tag--teal { background: rgba(45, 212, 191, .2); border-color: var(--teal-deep); }

/* ---------- 12. 图片 / 插画占位容器 ---------- */
.media-frame {
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background:
    linear-gradient(135deg, rgba(14, 42, 90, .1) 0%, rgba(255, 106, 26, .1) 52%, rgba(139, 92, 246, .1) 100%),
    var(--warm);
  border: 1px solid var(--ink);
}
.media-frame img,
.media-frame svg,
.media-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--portrait { aspect-ratio: 4 / 5; }
.media-frame__label {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 5px 12px;
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--paper);
  border-top: 1px solid var(--ink);
  border-right: 1px solid var(--ink);
}

/* ---------- 13. 滚动动效与进度 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .55s ease, transform .55s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 120;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--teal) 0%, var(--orange) 62%, var(--orange) 100%);
  pointer-events: none;
}

.to-top {
  position: fixed;
  right: clamp(12px, 3vw, 28px);
  bottom: clamp(12px, 3vw, 28px);
  z-index: 110;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  padding: 0;
  font-family: var(--font-num);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--ink);
  box-shadow: 0 10px 22px -16px rgba(11, 13, 18, .9);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .25s ease, transform .25s ease, visibility .25s ease, background-color .25s ease, color .25s ease;
}
.to-top.is-active {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.to-top:hover,
.to-top:focus-visible {
  background: var(--orange);
  color: var(--ink);
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1024px) {
  .grid--workbench { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--three { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-line2 {
    grid-template-columns: auto minmax(0, 1fr);
  }
  .footer-legal { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
  #main-content { scroll-margin-top: 96px; }

  .masthead { padding: 12px var(--gutter) 10px; }
  .masthead__inner {
    display: block;
    position: relative;
    text-align: center;
  }
  .masthead__meta { display: none; }
  .brand {
    justify-content: center;
    padding-inline: 56px;
  }
  .brand__sub { display: none; }
  .header-utility {
    margin-top: 12px;
    justify-content: center;
    justify-self: auto;
  }
  .nav-toggle {
    display: inline-flex;
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
  }

  .site-nav { display: none; }
  .site-nav[data-open="true"] { display: block; }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 6px var(--gutter) 14px;
  }
  .nav-item { width: 100%; }
  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 13px 6px;
    font-size: 14px;
    letter-spacing: .12em;
    border-bottom: 1px solid rgba(247, 245, 239, .16);
  }
  .nav-link[aria-current="page"],
  .nav-link:hover,
  .nav-link:focus-visible { background: linear-gradient(90deg, rgba(255, 106, 26, .26), rgba(255, 106, 26, 0) 70%); }

  .footer-line1 { flex-direction: column; align-items: flex-start; }
  .footer-line2 {
    grid-template-columns: 1fr;
    align-items: start;
    gap: 14px;
  }
  .footer-legal { grid-column: auto; }
  .footer-base { justify-content: flex-start; }
}

@media (max-width: 720px) {
  .grid--two,
  .grid--three,
  .grid--workbench { grid-template-columns: minmax(0, 1fr); }

  .section-head { align-items: flex-start; }
  .breadcrumb__list { font-size: 11px; letter-spacing: .08em; }
  .footer-facts { flex-direction: column; gap: 8px; }
  .footer-fact { flex-wrap: wrap; }
  .footer-apple { width: 100%; justify-content: center; }
}

/* ---------- 15. 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  .scroll-progress { display: none; }
}