/* =========================================================
   热竞技 HEARTBEAT — /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 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, h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd, ul, ol, pre { margin: 0; }
ul, ol { padding: 0; }
ul[class], ol[class] { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; }
table { border-collapse: collapse; width: 100%; }

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 色彩 */
  --paper: #F5EDE0;
  --paper-2: #EBE0CF;
  --ink: #1B1410;
  --brown: #3A2B22;
  --red: #E23A2E;
  --red-deep: #A8201A;
  --orange: #F26B1D;
  --ice: #7FB6B0;
  --sand: #D8A657;
  --cold: #A9B6B2;
  --night: #243B3A;
  --white: #FFF9F0;

  /* 字体 */
  --font-display: "Oswald", "Barlow Condensed", "Arial Narrow", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 度量 */
  --frame-w: 1320px;
  --gutter: clamp(1rem, 4vw, 2.75rem);
  --header-h: 68px;
  --dur: 200ms;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --gap: clamp(1rem, 2.4vw, 1.75rem);
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: .98;
  letter-spacing: -.02em;
  color: var(--ink);
}

h1 { font-size: clamp(2.4rem, 7vw, 5.2rem); }
h2 { font-size: clamp(1.55rem, 3.4vw, 2.5rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.45rem); line-height: 1.15; }

p { line-height: 1.85; }

a { text-decoration: none; }

::selection {
  background: var(--red);
  color: var(--white);
}

:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 2px;
}

#main-content {
  display: block;
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: .6rem;
  left: .6rem;
  z-index: 200;
  padding: .7rem 1rem;
  background: var(--ink);
  color: var(--white);
  border: 2px solid var(--red);
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .1em;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 160ms var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

/* ---------- 5. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background-color: var(--paper);
  color: var(--ink);
  border-bottom: 2px solid var(--ink);
  --pulse: 0;
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background-image: linear-gradient(90deg,
    var(--red-deep) 0%,
    var(--red) 26%,
    var(--orange) 52%,
    var(--sand) 76%,
    var(--ice) 100%);
  pointer-events: none;
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  bottom: 0;
  width: 6px;
  background-image: repeating-linear-gradient(180deg,
    var(--sand) 0 2px,
    transparent 2px 11px);
  opacity: .75;
  pointer-events: none;
}

.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  transform: scaleX(var(--pulse, 0));
  transform-origin: 0 50%;
  background-image: linear-gradient(90deg, var(--red), var(--orange) 70%, var(--sand));
  pointer-events: none;
  z-index: 2;
}

.header-inner {
  position: relative;
  width: min(var(--frame-w), 100%);
  margin-inline: auto;
  padding-inline: calc(var(--gutter) + 6px);
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .3rem clamp(.5rem, 1.6vw, 1.5rem);
}

/* 品牌 */
.brand {
  display: flex;
  flex-direction: column;
  gap: .1rem;
  margin-right: auto;
  padding: .45rem 0 .45rem .78rem;
  border-left: 3px solid var(--red);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease);
}
.brand:hover { border-left-color: var(--orange); }

.brand-mark {
  font-family: var(--font-display);
  font-size: 1.32rem;
  font-weight: 800;
  line-height: .92;
  letter-spacing: -.03em;
  color: var(--ink);
  transition: color var(--dur) var(--ease);
}
.brand:hover .brand-mark { color: var(--red-deep); }

.brand-sub {
  font-family: var(--font-mono);
  font-size: .56rem;
  line-height: 1;
  letter-spacing: .3em;
  color: var(--red-deep);
}

.brand-tagline {
  font-size: .7rem;
  line-height: 1.3;
  letter-spacing: .02em;
  color: var(--brown);
}

/* 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: .55rem;
  padding: .5rem .72rem;
  border: 1px solid var(--ink);
  background-color: transparent;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.nav-toggle:hover { border-color: var(--red); color: var(--red-deep); }

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background-color: currentColor;
  box-shadow: 0 -6px 0 currentColor, 0 6px 0 currentColor;
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.nav-toggle-label { line-height: 1; }

.site-header[data-open="true"] .nav-toggle {
  background-color: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.site-header[data-open="true"] .nav-toggle-bars {
  background-color: var(--orange);
  box-shadow: 0 -6px 0 var(--orange), 0 6px 0 var(--orange);
}

/* 导航 */
.site-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .1rem;
}
.nav-list > li { display: block; }

.nav-list a {
  position: relative;
  display: block;
  padding: .5rem .62rem .58rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  line-height: 1.25;
  letter-spacing: .04em;
  color: var(--brown);
  border: 1px solid transparent;
  transition: color var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: .62rem;
  right: .62rem;
  bottom: .3rem;
  height: 2px;
  background-image: linear-gradient(90deg, var(--red), var(--orange));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform var(--dur) var(--ease);
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--ink);
  border-color: var(--sand);
  background-color: rgba(216, 166, 87, .18);
}
.nav-list a:hover::after,
.nav-list a:focus-visible::after { transform: scaleX(1); }

.nav-list a[aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
  border-color: var(--ink);
  box-shadow: inset 0 -3px 0 0 var(--red);
}
.nav-list a[aria-current="page"]::after { transform: scaleX(1); }

/* 页头工具区 */
.header-tools {
  display: flex;
  align-items: center;
  gap: .6rem;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .55rem .95rem;
  background-color: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% 62%, calc(100% - 11px) 100%, 0 100%);
  transition: background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              color var(--dur) var(--ease);
}
.header-cta:hover,
.header-cta:focus-visible {
  background-color: var(--red);
  border-color: var(--red);
  color: var(--white);
}

.header-mail {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .02em;
  color: var(--brown);
  opacity: .85;
}

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative;
  background-color: var(--ink);
  color: var(--paper);
  border-top: 3px solid var(--red);
}

.footer-pulse {
  position: relative;
  height: 30px;
  overflow: hidden;
  border-bottom: 1px solid rgba(216, 166, 87, .28);
  background-image: repeating-linear-gradient(90deg,
    rgba(216, 166, 87, .45) 0 1px,
    transparent 1px 26px);
}

.footer-pulse::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(90deg,
    transparent 0%,
    rgba(226, 58, 46, .85) 32%,
    var(--orange) 55%,
    rgba(127, 182, 176, .7) 82%,
    transparent 100%);
  clip-path: polygon(0 46%, 26% 46%, 31% 6%, 38% 90%, 44% 46%, 100% 46%, 100% 60%, 44% 60%, 38% 100%, 31% 20%, 26% 60%, 0 60%);
}

.footer-inner {
  width: min(var(--frame-w), 100%);
  margin-inline: auto;
  padding: clamp(2.2rem, 5vw, 3.6rem) var(--gutter) clamp(1.6rem, 3vw, 2.4rem);
  display: grid;
  grid-template-columns: minmax(230px, 1.25fr) minmax(0, 1.9fr) minmax(200px, 1fr);
  gap: clamp(1.5rem, 3.2vw, 2.8rem);
  align-items: start;
}

.footer-brand { display: block; }

.footer-mark {
  display: block;
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--white);
}

.footer-sub {
  display: block;
  margin-top: .3rem;
  font-family: var(--font-mono);
  font-size: .6rem;
  line-height: 1;
  letter-spacing: .3em;
  color: var(--orange);
}

.footer-summary {
  margin-top: .95rem;
  max-width: 30ch;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--cold);
}

.footer-cta {
  display: inline-flex;
  align-items: center;
  margin-top: 1.1rem;
  padding: .6rem 1rem;
  border: 1px solid var(--orange);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .12em;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.footer-cta:hover,
.footer-cta:focus-visible {
  background-color: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 2.4vw, 2rem);
}

.footer-col { display: block; }

.footer-col-title {
  margin-bottom: .9rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 500;
  line-height: 1;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--sand);
}

.footer-links {
  display: grid;
  gap: .5rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links a {
  font-size: .9rem;
  line-height: 1.5;
  color: var(--paper);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.footer-contact ul {
  display: grid;
  gap: .6rem;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: .85rem;
  line-height: 1.7;
  color: var(--cold);
}

.footer-mono {
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .02em;
  color: var(--ice);
  word-break: break-all;
}

.footer-base {
  width: min(var(--frame-w), 100%);
  margin-inline: auto;
  padding: 1.2rem var(--gutter) 2.2rem;
  border-top: 1px solid rgba(216, 166, 87, .25);
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.footer-note {
  max-width: 62ch;
  font-size: .78rem;
  line-height: 1.7;
  color: var(--cold);
}

.footer-legal {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .06em;
  color: var(--sand);
}

/* ---------- 7. 通用布局 ---------- */
.container {
  width: min(var(--frame-w), 100%);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: clamp(2.5rem, 6vw, 5.5rem);
}
.section--paper { background-color: var(--paper); color: var(--ink); }
.section--night {
  background-color: var(--ink);
  color: var(--paper);
}
.section--night h1,
.section--night h2,
.section--night h3 { color: var(--white); }
.section--night a { color: var(--orange); }

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: clamp(1.2rem, 3vw, 2.2rem);
  padding-bottom: .85rem;
  border-bottom: 1px solid var(--sand);
}

.grid {
  display: grid;
  gap: var(--gap);
}
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

/* ---------- 8. 文本组件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  line-height: 1.2;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--red-deep);
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background-image: linear-gradient(90deg, var(--red), var(--orange));
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

.prose {
  max-width: 68ch;
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--brown);
}
.prose > * + * { margin-top: 1.1em; }
.prose h2 {
  margin-top: 1.8em;
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--ink);
}
.prose h3 {
  margin-top: 1.5em;
  color: var(--brown);
}
.prose a {
  color: var(--red-deep);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}
.prose a:hover { color: var(--red); }

/* ---------- 9. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .8rem 1.4rem;
  font-family: var(--font-mono);
  font-size: .8rem;
  line-height: 1.2;
  letter-spacing: .1em;
  text-decoration: none;
  border: 2px solid var(--ink);
  background-color: transparent;
  color: var(--ink);
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}
.btn:hover,
.btn:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--sand);
}

.btn--primary {
  background-color: var(--red);
  border-color: var(--red);
  color: var(--white);
}
.btn--primary:hover,
.btn--primary:focus-visible {
  background-color: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
  box-shadow: 4px 4px 0 var(--red-deep);
}

.btn--ghost {
  background-color: transparent;
  border-color: var(--brown);
  color: var(--brown);
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--red);
  color: var(--red-deep);
}

/* ---------- 10. 面包屑 ---------- */
.breadcrumb {
  padding-block: 1rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--brown);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.breadcrumb li + li::before {
  content: "/";
  margin-right: .5rem;
  color: var(--sand);
}
.breadcrumb a {
  border-bottom: 1px solid var(--sand);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--red-deep);
  border-bottom-color: var(--red);
}

/* ---------- 11. 面板与索引 ---------- */
.panel {
  position: relative;
  padding: clamp(1.1rem, 2.2vw, 1.7rem);
  background-color: var(--night);
  color: var(--paper);
  border: 1px solid rgba(127, 182, 176, .3);
  box-shadow: 0 20px 44px -34px rgba(27, 20, 16, .95);
}
.panel::after {
  content: "";
  position: absolute;
  top: -1px;
  right: -1px;
  width: 18px;
  height: 18px;
  background-image: linear-gradient(225deg, var(--sand) 0 50%, transparent 50%);
}
.panel h2,
.panel h3 { color: var(--white); }

.tag {
  display: inline-block;
  padding: .25rem .55rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  line-height: 1.4;
  letter-spacing: .1em;
  color: var(--brown);
  background-color: rgba(216, 166, 87, .16);
  border: 1px solid var(--sand);
}

/* ---------- 12. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background-color: var(--paper-2);
  border: 1px solid rgba(27, 20, 16, .22);
  border-left: 4px solid var(--sand);
}
.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(45deg,
    rgba(58, 43, 34, .09) 0 1px,
    transparent 1px 13px);
  pointer-events: none;
}
.media-frame img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--night {
  background-color: var(--night);
  border-color: rgba(127, 182, 176, .35);
  border-left-color: var(--red);
}
.media-frame--night::before {
  background-image: repeating-linear-gradient(45deg,
    rgba(127, 182, 176, .16) 0 1px,
    transparent 1px 13px);
}

.media-caption {
  margin-top: .6rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  line-height: 1.6;
  letter-spacing: .06em;
  color: var(--brown);
}

/* ---------- 13. 响应式 ---------- */
@media (max-width: 1180px) {
  .brand-tagline { display: none; }
  .header-mail { display: none; }
  .nav-list a { padding-inline: .5rem; font-size: .7rem; }
}

@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
  .footer-brand { grid-column: 1 / -1; }
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  :root { --header-h: 60px; }

  .site-header::after { width: 4px; }

  .header-inner {
    padding-inline: calc(var(--gutter) + 4px);
    min-height: var(--header-h);
    gap: .4rem .6rem;
  }

  .nav-toggle {
    display: inline-flex;
    order: 2;
    margin-left: auto;
  }

  .header-tools {
    order: 3;
    margin-left: 0;
  }

  .brand {
    order: 1;
    margin-right: 0;
  }

  .site-nav {
    order: 5;
    flex: 1 0 100%;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    padding: .6rem calc(var(--gutter) + 4px) 1.1rem;
    background-color: var(--ink);
    border-top: 2px solid var(--red);
    border-bottom: 2px solid var(--ink);
    max-height: calc(100vh - var(--header-h) - 12px);
    overflow-y: auto;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-list a {
    padding: .85rem .3rem;
    font-size: .85rem;
    letter-spacing: .06em;
    color: var(--paper);
    border: 0;
    border-bottom: 1px solid rgba(255, 249, 240, .14);
  }

  .nav-list a::after { display: none; }

  .nav-list a:hover,
  .nav-list a:focus-visible {
    color: var(--white);
    border-color: transparent;
    border-bottom-color: rgba(255, 249, 240, .14);
    background-color: rgba(242, 107, 29, .18);
  }

  .nav-list a[aria-current="page"] {
    color: var(--white);
    background-color: rgba(226, 58, 46, .2);
    box-shadow: inset 3px 0 0 0 var(--red);
    padding-left: .8rem;
    border-bottom-color: rgba(255, 249, 240, .14);
  }

  .header-cta { padding: .48rem .7rem; font-size: .68rem; }

  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  body { font-size: 16px; }

  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand,
  .footer-contact { grid-column: auto; }

  .footer-base { flex-direction: column; }

  .section-head { align-items: flex-start; }
}

@media (max-width: 480px) {
  :root { --gutter: 1rem; }

  .brand-mark { font-size: 1.12rem; }
  .brand-sub { letter-spacing: .22em; }
  .header-cta { letter-spacing: .06em; }
  .footer-nav { grid-template-columns: minmax(0, 1fr); }
  .grid--12 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 14. 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;
  }

  .header-progress { transition: none !important; }
  .btn:hover,
  .btn:focus-visible { transform: none; }
}