/* ==========================================================================
   百人牛牛电玩 CN 主站 · 共享样式表 /assets/site.css
   1 重置  2 变量  3 基础排版  4 头部  5 页脚  6 通用组件  7 响应式  8 无障碍
   ========================================================================== */

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

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

body,
h1, h2, h3, h4, h5,
p, ul, ol, li, figure, blockquote, 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; cursor: pointer; }

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

/* ---------- 2. 变量 ---------- */
:root {
  /* 品牌色 */
  --ink: #0B1B2B;
  --ink-deep: #050B12;
  --ink-panel: #122B44;
  --paper: #F3E8D0;
  --cyan: #26E0D6;
  --gold: #F2B84B;
  --coral: #FF5A5F;
  --magenta: #E5397A;
  --orange: #FF7A1A;
  --violet: #8C5CFF;
  --mist: #E6EDF3;

  /* 半透明辅助 */
  --paper-62: rgba(243, 232, 208, 0.62);
  --paper-20: rgba(243, 232, 208, 0.2);
  --paper-14: rgba(243, 232, 208, 0.14);
  --cyan-35: rgba(38, 224, 214, 0.35);

  /* 字体 */
  --font-display: "Archivo Black", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "Roboto Mono", ui-monospace, "SFMono-Regular", monospace;

  /* 粗野主义材质 */
  --bw: 2px;
  --hard: 6px 6px 0 var(--ink-deep);
  --hard-sm: 3px 3px 0 var(--ink-deep);
  --hard-lg: 8px 8px 0 var(--ink-deep);

  /* 节奏 */
  --shell: min(1320px, 100% - clamp(1.25rem, 5vw, 4rem));
  --gap: clamp(1rem, 2.2vw, 2rem);
  --space: clamp(2.5rem, 6vw, 5.5rem);

  --dur: 0.22s;
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: 0.08em;
}

h1 { font-size: clamp(2.5rem, 6vw, 4rem); }
h2 { font-size: clamp(1.75rem, 3.6vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2.4vw, 1.6rem); }

p { max-width: 38em; }

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

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

/* ---------- 4. 头部 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 120;
  padding: 0.7rem 1.35rem;
  background: var(--gold);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  border: var(--bw) solid var(--ink-deep);
  box-shadow: var(--hard-sm);
  transform: translate(-50%, -130%);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translate(-50%, 0.6rem);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--ink);
  color: var(--paper);
  border-bottom: var(--bw) solid var(--ink-deep);
  box-shadow: 0 2px 0 var(--cyan);
}

.header-rail {
  width: var(--shell);
  margin-inline: auto;
  min-height: 76px;
  padding-block: 0.65rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(0.75rem, 3vw, 2.5rem);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: wrap;
  min-width: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  min-width: 0;
}

.brand-mark__glyph {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: none;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1.05rem;
  line-height: 1;
  letter-spacing: 0;
  border: var(--bw) solid var(--ink-deep);
  box-shadow: var(--hard-sm);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.brand-mark:hover .brand-mark__glyph,
.brand-mark:focus-visible .brand-mark__glyph {
  transform: translate(-2px, -2px);
  background: var(--gold);
}

.brand-mark__text {
  font-family: var(--font-display);
  font-size: clamp(1rem, 1.9vw, 1.28rem);
  line-height: 1.1;
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.version-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.18rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.6;
  letter-spacing: 0.08em;
  color: var(--gold);
  border: var(--bw) solid rgba(242, 184, 75, 0.5);
  white-space: nowrap;
}

.version-badge__dot {
  width: 7px;
  height: 7px;
  flex: none;
  background: var(--gold);
  box-shadow: 0 0 0 2px rgba(242, 184, 75, 0.25);
}

.site-nav {
  display: flex;
  align-items: center;
  min-width: 0;
}

.site-nav__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: clamp(0.2rem, 1vw, 0.9rem);
}

.site-nav__list a {
  position: relative;
  display: inline-block;
  padding: 0.5rem 0.7rem;
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--paper);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.site-nav__list a::after {
  content: "";
  position: absolute;
  left: 0.7rem;
  right: 0.7rem;
  bottom: 0.22rem;
  height: 3px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}

.site-nav__list a:hover,
.site-nav__list a:focus-visible {
  color: var(--gold);
}

.site-nav__list a:hover::after,
.site-nav__list a:focus-visible::after {
  transform: scaleX(1);
}

.site-nav__list a[aria-current="page"] {
  background: var(--cyan);
  color: var(--ink);
  font-weight: 700;
  box-shadow: var(--hard-sm);
}

.site-nav__list a[aria-current="page"]::after {
  display: none;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  padding: 0.45rem 0.7rem;
  background: var(--ink-panel);
  color: var(--paper);
  border: var(--bw) solid var(--paper);
  box-shadow: var(--hard-sm);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
    transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-toggle:hover {
  background: var(--cyan);
  color: var(--ink);
  border-color: var(--ink-deep);
  transform: translate(-2px, -2px);
}

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
}

.nav-toggle__bars span {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.site-header[data-open="true"] .nav-toggle {
  background: var(--gold);
  color: var(--ink);
  border-color: var(--ink-deep);
}

.site-header[data-open="true"] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.site-header[data-open="true"] .nav-toggle__bars span:nth-child(2) {
  opacity: 0;
}

.site-header[data-open="true"] .nav-toggle__bars span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

/* ---------- 5. 页脚 ---------- */
.site-footer {
  margin-top: var(--space);
  background: var(--ink);
  color: var(--paper);
  border-top: 3px solid var(--gold);
}

.footer-inner {
  width: var(--shell);
  margin-inline: auto;
  padding-block: clamp(2.5rem, 5vw, 4rem) clamp(1.5rem, 3vw, 2.25rem);
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
}

.footer-lead {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.85rem;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  line-height: 1.1;
  letter-spacing: 0.1em;
  max-width: none;
}

.footer-brand::after {
  content: "";
  display: block;
  width: 64px;
  height: 6px;
  margin-top: 0.7rem;
  background: var(--cyan);
}

.footer-tagline {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--paper);
  max-width: 26em;
}

.footer-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.4rem;
  padding: 0.7rem 1.2rem;
  background: var(--gold);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  border: var(--bw) solid var(--ink-deep);
  box-shadow: var(--hard);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.footer-cta:hover,
.footer-cta:focus-visible {
  background: var(--cyan);
  transform: translate(-2px, -2px);
  box-shadow: var(--hard-lg);
}

.footer-cta:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--ink-deep);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap);
  align-content: start;
}

.footer-group__title {
  margin-bottom: 0.9rem;
  padding-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--cyan);
  border-bottom: var(--bw) solid var(--cyan-35);
}

.footer-group__list {
  display: grid;
  gap: 0.1rem;
}

.footer-group__list a {
  display: inline-block;
  padding: 0.28rem 0;
  font-size: 0.92rem;
  color: var(--paper);
  background-image: linear-gradient(var(--gold), var(--gold));
  background-repeat: no-repeat;
  background-size: 0% 2px;
  background-position: 0 100%;
  transition: background-size var(--dur) var(--ease), color var(--dur) var(--ease);
}

.footer-group__list a:hover,
.footer-group__list a:focus-visible {
  color: var(--gold);
  background-size: 100% 2px;
}

.footer-meta {
  grid-column: 1 / -1;
  margin-top: clamp(1.5rem, 3vw, 2.5rem);
  padding-top: clamp(1.2rem, 2.5vw, 1.8rem);
  border-top: var(--bw) solid var(--paper-20);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--gap);
}

.footer-meta__block {
  display: grid;
  gap: 0.35rem;
  align-content: start;
}

.footer-meta__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--gold);
  max-width: none;
}

.footer-contact__item {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
  max-width: 30em;
  transition: color var(--dur) var(--ease);
}

a.footer-contact__item:hover,
a.footer-contact__item:focus-visible {
  color: var(--cyan);
}

.footer-meta__block--note .footer-contact__item {
  font-size: 0.82rem;
  color: var(--paper-62);
}

.footer-base {
  grid-column: 1 / -1;
  margin-top: clamp(1.25rem, 2.5vw, 1.8rem);
  padding-top: 1rem;
  border-top: var(--bw) solid var(--paper-14);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--paper-62);
}

.footer-base p {
  max-width: none;
}

.footer-base__legal {
  color: var(--paper-62);
}

/* ---------- 6. 通用组件 ---------- */
.shell {
  width: var(--shell);
  margin-inline: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  border: var(--bw) solid var(--ink-deep);
  box-shadow: var(--hard);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.btn:hover,
.btn:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: var(--hard-lg);
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--ink-deep);
}

.btn--gold {
  background: var(--gold);
}

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

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--ink-deep);
}

.breadcrumbs {
  padding-block: 1.25rem 0;
  width: var(--shell);
  margin-inline: auto;
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--paper-62);
}

.breadcrumbs__list li {
  display: inline-flex;
  align-items: center;
}

.breadcrumbs__list li + li::before {
  content: "/";
  margin-right: 0.4rem;
  color: var(--gold);
}

.breadcrumbs__list a:hover,
.breadcrumbs__list a:focus-visible {
  color: var(--cyan);
}

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

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  margin-bottom: clamp(1rem, 2.5vw, 1.75rem);
  padding-bottom: 0.85rem;
  border-bottom: var(--bw) solid var(--paper-20);
}

.section-head__title {
  font-size: clamp(1.25rem, 2.6vw, 1.8rem);
  letter-spacing: 0.08em;
}

.section-head__note {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--paper-62);
  max-width: none;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  max-width: none;
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 3px;
  background: var(--gold);
}

.panel {
  padding: clamp(1.1rem, 2.4vw, 1.75rem);
  background: var(--ink-panel);
  color: var(--paper);
  border: var(--bw) solid rgba(243, 232, 208, 0.28);
  box-shadow: var(--hard);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.panel:hover,
.panel:focus-within {
  border-color: var(--cyan);
  transform: translate(-2px, -2px);
  box-shadow: var(--hard-lg);
}

.panel--paper {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--ink-deep);
}

.panel--paper strong {
  color: var(--magenta);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.12rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  line-height: 1.7;
  border: var(--bw) solid currentColor;
}

.tag--cyan { color: var(--cyan); }
.tag--gold { color: var(--gold); }
.tag--coral { color: var(--coral); }
.tag--magenta { color: var(--magenta); }
.tag--orange { color: var(--orange); }
.tag--violet { color: var(--violet); }

.grid-board {
  display: grid;
  gap: var(--gap);
}

.grid-board--split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
.grid-board--halves { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-board--thirds { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.media-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--ink-panel);
  border: var(--bw) solid var(--ink-deep);
  box-shadow: var(--hard);
}

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

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

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 90;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan) 0 50%, var(--gold) 50% 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
  will-change: transform;
}

/* ---------- 7. 响应式 ---------- */
@media (max-width: 1100px) {
  .site-nav__list a {
    padding-inline: 0.5rem;
    font-size: 0.86rem;
  }
  .site-nav__list a::after {
    left: 0.5rem;
    right: 0.5rem;
  }
}

@media (max-width: 900px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    padding-block: 0.5rem;
    background: var(--ink-panel);
    border-top: var(--bw) solid var(--ink-deep);
    border-bottom: 3px solid var(--ink-deep);
    box-shadow: 0 8px 0 rgba(5, 11, 18, 0.85);
    max-height: calc(100vh - 76px);
    overflow-y: auto;
  }

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

  .site-nav__list {
    width: var(--shell);
    margin-inline: auto;
    flex-direction: column;
    align-items: stretch;
    flex-wrap: nowrap;
    gap: 0;
  }

  .site-nav__list li + li {
    border-top: var(--bw) solid rgba(5, 11, 18, 0.45);
  }

  .site-nav__list a {
    display: block;
    padding: 0.85rem 0.4rem;
    font-size: 1rem;
  }

  .site-nav__list a::after {
    left: 0.4rem;
    right: 0.4rem;
    bottom: 0.5rem;
  }

  .site-nav__list a[aria-current="page"] {
    margin-block: 0.35rem;
    padding-inline: 0.7rem;
    box-shadow: var(--hard-sm);
  }

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

  .grid-board--split,
  .grid-board--halves,
  .grid-board--thirds {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 600px) {
  :root {
    --hard: 4px 4px 0 var(--ink-deep);
    --hard-lg: 5px 5px 0 var(--ink-deep);
  }

  .header-rail {
    min-height: 64px;
  }

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

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

  .footer-base {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .version-badge {
    display: none;
  }

  .brand-mark__glyph {
    width: 32px;
    height: 32px;
    font-size: 0.92rem;
  }
}

/* ---------- 8. 无障碍 ---------- */
:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 3px;
}

.panel--paper :focus-visible {
  outline-color: var(--magenta);
}

@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;
  }

  .panel:hover,
  .panel:focus-within,
  .btn:hover,
  .btn:focus-visible,
  .footer-cta:hover,
  .footer-cta:focus-visible,
  .brand-mark:hover .brand-mark__glyph,
  .brand-mark:focus-visible .brand-mark__glyph {
    transform: none;
  }
}