/* =========================================================
   /assets/site.css — 赢咖CN 共享外壳与基础组件
   色彩：招牌墨绿 / 奶油纸 / 暖铜 / 信号橙
   形状：锐利直角、1px 网格、无圆角、无投影
   ========================================================= */

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

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

body {
  margin: 0;
  background: var(--cream);
  color: var(--char);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { max-width: 100%; display: block; }
table { border-collapse: collapse; width: 100%; }
button { font: inherit; color: inherit; }
a { color: var(--lacquer); text-decoration-thickness: 1px; text-underline-offset: 3px; }

h1, h2, h3, h4 { line-height: 1.15; font-weight: 700; }

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

/* ---------- 2. 变量 ---------- */
:root {
  /* 色彩 */
  --ink-green: #0E2B25;
  --ink-deep: #071815;
  --lacquer: #1B4B3D;
  --cream: #F3EBDC;
  --paper: #FBF6EC;
  --copper: #C0874B;
  --copper-hi: #E7B77F;
  --signal: #F4551E;
  --char: #16110B;
  --mist: #8FA49B;
  --night: #0A1C22;

  /* 线条 */
  --line-copper: 1px solid rgba(192, 135, 75, .45);
  --line-copper-strong: 1px solid var(--copper);
  --line-copper-soft: 1px solid rgba(192, 135, 75, .24);

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

  /* 尺度 */
  --wrap: 1240px;
  --gutter: clamp(18px, 4vw, 56px);
  --header-h: 76px;
  --ease: cubic-bezier(.2, .7, .3, 1);
}

@media (max-width: 1024px) { :root { --header-h: 66px; } }
@media (max-width: 560px) { :root { --header-h: 60px; } }

/* ---------- 3. 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  display: inline-block;
  padding: 10px 16px;
  background: var(--signal);
  color: var(--char);
  border: 1px solid var(--char);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-decoration: none;
  transform: translateY(-260%);
  transition: transform .22s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible { transform: translateY(0); }

/* ---------- 4. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: transparent;
  border-bottom: 1px solid transparent;
  color: var(--paper);
  transition: background-color .28s var(--ease),
              border-color .28s var(--ease),
              color .28s var(--ease);
}

.site-header[data-header="solid"] {
  background: var(--cream);
  color: var(--char);
  border-bottom-color: var(--copper);
}

.site-header__inner {
  position: relative;
  max-width: var(--wrap);
  margin: 0 auto;
  height: var(--header-h);
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  transition: height .28s var(--ease);
}

@media (min-width: 1025px) {
  .site-header[data-header="solid"] .site-header__inner { height: 64px; }
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  color: inherit;
  text-decoration: none;
}

.brand__mark {
  position: relative;
  flex: 0 0 14px;
  width: 14px;
  height: 14px;
  border: 1px solid currentColor;
  border-radius: 50%;
}
.brand__mark::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  background: var(--signal);
}

.brand__text { display: block; }

.brand__wordmark {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  line-height: 1;
  letter-spacing: -.02em;
  font-stretch: 85%;
}

.brand__tagline {
  display: block;
  margin-top: 5px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  letter-spacing: .12em;
  opacity: .62;
}

/* 导航（桌面） */
.nav {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav__link {
  position: relative;
  display: block;
  padding: 10px 13px;
  color: inherit;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: .02em;
  text-decoration: none;
  transition: background-color .2s var(--ease), color .2s var(--ease);
}

.nav__link::before {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 4px;
  height: 2px;
  background: var(--signal);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .24s var(--ease);
}

.nav__link:hover::before,
.nav__link:focus-visible::before,
.nav__link[aria-current="page"]::before { transform: scaleX(1); }

.site-header[data-header="solid"] .nav__link:hover { background: rgba(192, 135, 75, .16); }

.nav__cta { display: none; }
.nav__foot { display: none; }

/* 移动开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  background: transparent;
  color: inherit;
  border: 1px solid currentColor;
  border-radius: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  cursor: pointer;
}

.nav-toggle__box {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform .24s var(--ease), opacity .18s var(--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); }

/* 头部 CTA */
.site-header__cta {
  flex: 0 0 auto;
  margin-left: 6px;
  padding: 11px 18px;
  font-size: 15px;
}

/* 阅读进度 */
.site-header__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: transparent;
  overflow: hidden;
}

.site-header__progress-bar {
  display: block;
  width: 0;
  height: 100%;
  background: var(--signal);
  transition: width .1s linear;
}

/* ---------- 5. 移动端导航 ---------- */
@media (max-width: 1024px) {
  .nav-toggle { display: inline-flex; margin-left: auto; }
  .site-header__cta { display: none; }

  .brand__tagline { display: none; }

  .nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    left: auto;
    z-index: 95;
    width: min(340px, 88vw);
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    padding: 22px 22px 30px;
    background: var(--ink-green);
    border-left: 1px solid var(--copper);
    overflow-y: auto;
    visibility: hidden;
    transform: translateX(100%);
    transition: transform .3s var(--ease), visibility .3s var(--ease);
  }

  .nav[data-open="true"] {
    visibility: visible;
    transform: translateX(0);
  }

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

  .nav__item {
    border-bottom: var(--line-copper-soft);
  }
  .nav__item:first-child { border-top: var(--line-copper-soft); }

  .nav__link {
    padding: 15px 4px;
    font-size: 17px;
    color: var(--paper);
  }

  .nav__link::before {
    left: 4px;
    right: 4px;
    bottom: 9px;
  }

  .nav__link[aria-current="page"] { color: var(--copper-hi); }

  .nav__cta {
    display: inline-flex;
    justify-content: center;
    margin-top: 22px;
  }

  .nav__foot {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: auto;
    padding-top: 26px;
    border-top: var(--line-copper-soft);
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: .08em;
    color: var(--mist);
  }
}

@media (min-width: 1025px) {
  .nav__foot-item { display: none; }
}

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--ink-green);
  color: var(--cream);
  border-top: 1px solid var(--copper);
}

.site-footer__ruler {
  height: 16px;
  border-bottom: 1px solid rgba(192, 135, 75, .45);
  background-image: repeating-linear-gradient(
    to right,
    rgba(192, 135, 75, .75) 0 1px,
    transparent 1px 22px
  );
  background-size: 100% 8px;
  background-repeat: repeat-x;
  background-position: left bottom;
}

.site-footer__inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(40px, 5.5vw, 72px) var(--gutter) clamp(32px, 4.5vw, 54px);
  display: grid;
  grid-template-columns: 1.5fr .9fr .9fr 1.4fr;
  gap: clamp(22px, 3.5vw, 52px);
}

.footer-brand { display: flex; flex-direction: column; gap: 12px; }

.footer-brand__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--paper);
  text-decoration: none;
}

.footer-brand__word {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 24px;
  line-height: 1;
  letter-spacing: -.02em;
  font-stretch: 85%;
}

.footer-brand__line {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.5;
  color: var(--copper-hi);
  max-width: 16em;
}

.footer-brand__coord {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
  line-height: 1.7;
}

.footer-col { min-width: 0; }

.footer-col__title {
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: var(--line-copper);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--copper-hi);
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col__list a {
  color: var(--cream);
  font-size: 15px;
  line-height: 1.6;
  text-decoration: none;
  transition: color .2s var(--ease);
}

.footer-col__list a:hover,
.footer-col__list a:focus-visible {
  color: var(--signal);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.footer-col__list--plain li {
  color: var(--cream);
  font-size: 15px;
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.footer-col--contact .footer-col__list--plain li:first-child {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .02em;
}

.site-footer__meta {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 22px var(--gutter) 34px;
  border-top: var(--line-copper);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  line-height: 1.8;
  color: var(--mist);
}

.footer-legal { color: var(--copper-hi); }
.footer-copy { color: var(--cream); }
.footer-note {
  flex: 0 1 100%;
  padding-top: 8px;
  border-top: 1px solid rgba(192, 135, 75, .18);
  color: var(--mist);
}

@media (max-width: 900px) {
  .site-footer__inner { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 560px) {
  .site-footer__inner { grid-template-columns: 1fr; }
  .site-footer__meta { flex-direction: column; align-items: flex-start; }
}

/* ---------- 7. 布局工具 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* 首屏透明叠加：给 <main> 加此类，首个区块自动垫到导航之下 */
.main--overlap { margin-top: calc(var(--header-h) * -1); }
.main--overlap > :first-child {
  padding-top: calc(var(--header-h) + clamp(28px, 4.5vw, 58px));
  background-color: var(--ink-green);
  color: var(--cream);
}

#main-content { scroll-margin-top: calc(var(--header-h) + 12px); }

/* ---------- 8. 区块与面板 ---------- */
.section { padding: clamp(48px, 7vw, 104px) 0; }
.section--cream { background: var(--cream); color: var(--char); }
.section--paper { background: var(--paper); color: var(--char); }
.section--dark { background: var(--ink-green); color: var(--cream); }

.rule {
  border: 0;
  border-top: var(--line-copper);
  margin: 0;
}

.panel {
  background: var(--paper);
  color: var(--char);
  border: var(--line-copper);
  padding: clamp(20px, 3vw, 32px);
}

.panel--dark {
  background: var(--lacquer);
  color: var(--cream);
  border-color: rgba(192, 135, 75, .55);
}

/* ---------- 9. 文本组件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--copper);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
}
.section--dark .eyebrow,
.panel--dark .eyebrow { color: var(--copper-hi); }

.mono-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--mist);
}
.section--dark .mono-label,
.panel--dark .mono-label { color: var(--mist); }

.tag {
  display: inline-block;
  padding: 4px 8px;
  border: 1px solid var(--copper);
  color: var(--copper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  line-height: 1.4;
  text-transform: uppercase;
}
.tag--signal {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--char);
}

.prose {
  max-width: 36em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--char);
}
.prose > * + * { margin-top: 1.15em; }
.prose h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 28px;
  line-height: 1.25;
  letter-spacing: -.01em;
  margin-top: 1.9em;
}
.prose h3 {
  font-size: 21px;
  font-weight: 700;
  line-height: 1.4;
  margin-top: 1.6em;
}
.prose ul, .prose ol { padding-left: 1.2em; list-style: disc; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: .4em; }
.prose a { color: var(--lacquer); text-decoration: underline; text-decoration-color: var(--copper); }
.prose a:hover { color: var(--signal); text-decoration-color: var(--signal); }
.prose strong { font-weight: 700; }
.prose blockquote {
  margin: 1.7em 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--signal);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 21px;
  line-height: 1.6;
}
@media (max-width: 760px) {
  .prose { font-size: 15px; line-height: 1.9; }
  .prose h2 { font-size: 21px; }
  .prose h3 { font-size: 17px; }
}

/* ---------- 10. 面包屑 ---------- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: inherit;
  opacity: .72;
}
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--copper);
}
.breadcrumb__item a { color: inherit; text-decoration: none; }
.breadcrumb__item a:hover { color: var(--signal); text-decoration: underline; text-underline-offset: 3px; }
.breadcrumb__item[aria-current="page"] { color: var(--copper-hi); opacity: 1; }

/* ---------- 11. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 20px;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: .02em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .22s var(--ease),
              color .22s var(--ease),
              border-color .22s var(--ease);
}
.btn--signal {
  background: var(--signal);
  color: var(--char);
  border-color: var(--signal);
}
.btn--signal:hover,
.btn--signal:focus-visible {
  background: var(--copper-hi);
  border-color: var(--copper-hi);
}
.btn--ghost {
  background: transparent;
  color: inherit;
  border-color: currentColor;
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--char);
}
.btn--dark {
  background: var(--ink-green);
  color: var(--paper);
  border-color: var(--ink-green);
}
.btn--dark:hover,
.btn--dark:focus-visible {
  background: var(--lacquer);
  border-color: var(--copper);
}

/* ---------- 12. 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

@media (max-width: 900px) {
  .grid--2, .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .grid--12 { gap: 16px; }
}

/* ---------- 13. 图片容器基础 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--night);
  border: 1px solid rgba(192, 135, 75, .55);
}
.media--square { aspect-ratio: 1 / 1; }
.media--portrait { aspect-ratio: 3 / 4; }
.media--wide { aspect-ratio: 16 / 9; }

.media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.92) contrast(1.04);
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(251, 246, 236, .055) 0 1px,
    transparent 1px 3px
  );
  mix-blend-mode: overlay;
}

.media__caption {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  line-height: 1.6;
  color: var(--mist);
}
.section--cream .media__caption,
.section--paper .media__caption { color: #6E6357; }

/* ---------- 14. 无障碍 / 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .site-header__progress-bar { transition: none; }
  .skip-link { transition: none; }
}

@media (max-width: 420px) {
  .brand__wordmark { font-size: 19px; }
  .nav-toggle__label { display: none; }
}