/* ============================================================
   威哥主页 · 全站共享样式表  /assets/site.css
   夜航仪表盘：深墨蓝基底 + 信号橙 + 荧光青
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root {
  /* 色板 */
  --ink: #0B1B2B;
  --ink-deep: #071320;
  --paper: #F4F1EA;
  --card: #FBF9F4;
  --warm: #C9C3B6;
  --signal: #FF6A2B;
  --cyan: #31E0D0;
  --mist: #3E6E8E;
  --amber: #F2B544;
  --line: #6F8BA3;

  /* 尺寸 */
  --shell: 1240px;
  --gutter: clamp(18px, 4vw, 48px);
  --r-lg: 26px;
  --r-md: 16px;
  --r-sm: 10px;

  /* 字体 */
  --font-sans: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "SF Mono", Consolas, "Liberation Mono", monospace;
  --font-hand: "Xingkai SC", "STKaiti", "KaiTi", "Segoe Script", cursive;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 132px;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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 { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

#main-content { display: block; }

/* ---------- 3. 排版原语 ---------- */
.display {
  font-weight: 900;
  font-stretch: 88%;
  letter-spacing: -0.03em;
  line-height: 1.02;
  font-size: clamp(42px, 6.4vw, 96px);
  color: var(--paper);
}

.h-sec {
  font-weight: 900;
  font-stretch: 90%;
  letter-spacing: -0.02em;
  line-height: 1.14;
  font-size: clamp(28px, 3.4vw, 46px);
}

.h-sub {
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.3;
  font-size: clamp(19px, 1.7vw, 24px);
}

.kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.lede {
  font-size: clamp(17px, 1.35vw, 19px);
  line-height: 1.85;
  color: var(--warm);
}

.hand {
  font-family: var(--font-hand);
  font-size: 19px;
  line-height: 1.6;
  color: var(--amber);
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.94em;
  letter-spacing: 0.01em;
}

/* ---------- 4. 布局容器 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.shell--narrow { max-width: 880px; }

.stack > * + * { margin-top: var(--stack-gap, 18px); }

.section { padding-block: clamp(56px, 8vw, 120px); }

.section--paper {
  background-color: var(--paper);
  color: var(--ink);
}
.section--paper .h-sec,
.section--paper .h-sub,
.section--paper .display { color: var(--ink); }
.section--paper .lede { color: #46515d; }
.section--paper .kicker { color: var(--mist); }
.section--paper .callout { color: #46515d; }

.section--tint {
  background-color: var(--ink);
  background-image:
    radial-gradient(120% 80% at 10% 0%, rgba(62, 110, 142, 0.30), transparent 62%),
    radial-gradient(90% 70% at 100% 100%, rgba(49, 224, 208, 0.10), transparent 60%);
}

.grid {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
}
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }

.bento {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 22px);
}
.bento > * { grid-column: span 12; min-width: 0; }

@media (min-width: 780px) {
  .bento > .bento-span-3 { grid-column: span 3; }
  .bento > .bento-span-4 { grid-column: span 4; }
  .bento > .bento-span-5 { grid-column: span 5; }
  .bento > .bento-span-6 { grid-column: span 6; }
  .bento > .bento-span-7 { grid-column: span 7; }
  .bento > .bento-span-8 { grid-column: span 8; }
}

/* ---------- 5. 图片容器 ---------- */
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-md);
  background-color: var(--ink-deep);
  background-image: linear-gradient(140deg, #0E2338, #071320 62%);
  aspect-ratio: 16 / 10;
}
.media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }

.media--scan::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(49, 224, 208, 0.07) 0 1px,
    transparent 1px 3px
  );
}

.media__ph {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: rgba(111, 139, 163, 0.7);
}

.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 22px 16px 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--paper);
  background-image: linear-gradient(to top, rgba(7, 19, 32, 0.94), rgba(7, 19, 32, 0));
}

/* ---------- 6. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  --masthead-pad: 13px;
  background-color: var(--ink-deep);
  box-shadow: 0 1px 0 rgba(49, 224, 208, 0.16), 0 18px 40px -28px rgba(0, 0, 0, 0.95);
  transition: box-shadow 0.25s var(--ease);
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 14px;
  z-index: 300;
  padding: 10px 18px;
  border-radius: 0 0 10px 10px;
  background-color: var(--signal);
  color: #FFFFFF;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 0; }

/* 上层：品牌说明带 */
.masthead {
  background-image: linear-gradient(180deg, rgba(62, 110, 142, 0.22), rgba(7, 19, 32, 0));
}

.masthead__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-top: var(--masthead-pad);
  padding-bottom: var(--masthead-pad);
  transition: padding 0.25s var(--ease);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  text-decoration: none;
}

.brand__mark {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  background-image: linear-gradient(150deg, var(--signal), #FF9A5F);
  color: #22100A;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  line-height: 1;
}

.brand__text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.brand__name {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.3;
  color: var(--paper);
}

.brand__tag {
  font-size: 12px;
  line-height: 1.5;
  color: var(--line);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: opacity 0.25s var(--ease);
}

.masthead__aside {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 0 0 auto;
}

.masthead__hint {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--line);
  transition: opacity 0.25s var(--ease);
}

.site-header.is-condensed { --masthead-pad: 7px; }
.site-header.is-condensed .masthead__hint { opacity: 0; }
.site-header.is-condensed .brand__tag { opacity: 0; }

/* 下层：栏目索引条 */
.railbar {
  position: relative;
  background-color: rgba(11, 27, 43, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid rgba(201, 195, 182, 0.10);
}

.railbar__inner {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 24px);
  min-height: 56px;
}

.railbar__label {
  flex: 0 0 auto;
  padding-right: 16px;
  border-right: 1px solid rgba(201, 195, 182, 0.18);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--line);
  white-space: nowrap;
}

.nav { margin-left: auto; }

.nav__list {
  display: flex;
  align-items: center;
  gap: clamp(2px, 1.2vw, 14px);
}

.nav__list a {
  position: relative;
  display: block;
  padding: 12px 10px;
  font-size: 15px;
  font-weight: 500;
  color: var(--warm);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s var(--ease);
}

.nav__list a::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 6px;
  height: 2px;
  border-radius: 2px;
  background-color: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s var(--ease), background-color 0.18s var(--ease);
}

.nav__list a:hover { color: var(--paper); }
.nav__list a:hover::after { transform: scaleX(1); background-color: var(--cyan); }

.nav__list a[aria-current="page"] { color: var(--paper); }
.nav__list a[aria-current="page"]::after {
  transform: scaleX(1);
  background-color: var(--signal);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 8px 14px;
  border: 1px solid rgba(201, 195, 182, 0.28);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--paper);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.nav-toggle__bars {
  display: inline-grid;
  gap: 3px;
  width: 16px;
}
.nav-toggle__bars i {
  display: block;
  height: 2px;
  border-radius: 2px;
  background-color: currentColor;
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}

.nav-toggle[aria-expanded="true"] { border-color: var(--signal); color: var(--signal); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 底部阅读进度线 */
.readout {
  position: relative;
  height: 2px;
  background-color: rgba(201, 195, 182, 0.12);
  overflow: hidden;
}
.readout__bar {
  display: block;
  width: 0;
  height: 100%;
  background-image: linear-gradient(90deg, var(--cyan), var(--signal));
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  background-color: var(--ink-deep);
  color: var(--warm);
  border-top: 1px solid rgba(201, 195, 182, 0.14);
  padding-top: clamp(48px, 7vw, 88px);
  padding-bottom: clamp(22px, 3vw, 32px);
  font-size: 15px;
  line-height: 1.75;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.35fr 1.55fr;
  gap: clamp(26px, 3.4vw, 52px);
  padding-bottom: clamp(32px, 4vw, 52px);
  border-bottom: 1px solid rgba(201, 195, 182, 0.14);
}

.footer__col { min-width: 0; }

.footer__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer__list { display: grid; gap: 9px; }

.footer__list a {
  color: var(--warm);
  font-size: 15px;
  text-decoration: none;
  transition: color 0.18s var(--ease);
}
.footer__list a:hover { color: var(--signal); }

.brand--footer { margin-bottom: 14px; }
.brand--footer .brand__name { font-size: 18px; }

.footer__note {
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--line);
}

.footer__meta {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--line);
}

.footer__list--index li {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.footer__list--index .num {
  flex: 0 0 auto;
  padding: 2px 6px;
  border-radius: 3px;
  background-color: var(--amber);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.04em;
}

.footer__list--contact li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 10px;
  align-items: start;
}

.footer__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--line);
}

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-top: clamp(18px, 2.4vw, 26px);
  font-size: 13px;
  color: var(--line);
}

.footer__legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
}
.footer__legal-links a {
  color: var(--line);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}
.footer__legal-links a:hover { color: var(--cyan); }

.footer__copy {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
}

/* ---------- 8. 按钮与标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.btn--sm { padding: 8px 15px; font-size: 13.5px; }

.btn--signal { background-color: var(--signal); color: #FFFFFF; }
.btn--signal:hover { background-color: #FF8352; }

.btn--cyan { background-color: var(--cyan); color: #04201F; }
.btn--cyan:hover { background-color: #5AEAE0; }

.btn--ink { background-color: var(--ink); color: var(--paper); }
.btn--ink:hover { background-color: #142C42; }

.btn--ghost {
  border-color: rgba(201, 195, 182, 0.34);
  color: var(--paper);
  background-color: transparent;
}
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  border: 1px solid rgba(201, 195, 182, 0.22);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--warm);
  text-decoration: none;
}
.chip--cyan { border-color: rgba(49, 224, 208, 0.44); color: var(--cyan); }
.chip--signal { border-color: rgba(255, 106, 43, 0.46); color: var(--signal); }

.dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(49, 224, 208, 0.14);
}
.dot--amber {
  background-color: var(--amber);
  box-shadow: 0 0 0 4px rgba(242, 181, 68, 0.14);
}

.num-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;
  height: 26px;
  padding: 0 9px;
  border-radius: 5px;
  background-color: var(--signal);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1;
}

/* ---------- 9. 卡片与区块组件 ---------- */
.card {
  position: relative;
  min-width: 0;
  padding: clamp(20px, 2.6vw, 32px);
  border-radius: var(--r-lg);
  background-color: var(--card);
  color: var(--ink);
}

.card--ink {
  background-color: var(--ink-deep);
  background-image: none;
  color: var(--paper);
  border: 1px solid rgba(201, 195, 182, 0.14);
}
.card--ink .lede { color: var(--warm); }

.card--mist {
  background-color: var(--ink-deep);
  background-image: linear-gradient(160deg, rgba(62, 110, 142, 0.34), rgba(7, 19, 32, 0.72));
  color: var(--paper);
  border: 1px solid rgba(62, 110, 142, 0.44);
}

.card__head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.callout {
  display: grid;
  gap: 6px;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--warm);
}
.callout--amber { border-left-color: var(--amber); }

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(111, 139, 163, 0.5) 0 6px,
    transparent 6px 14px
  );
}

.chapter-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--line);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(111, 139, 163, 0.6);
}
.breadcrumb a {
  color: var(--warm);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}
.breadcrumb a:hover { color: var(--cyan); }

/* ---------- 10. 显现动效 ---------- */
@media (scripting: enabled) {
  [data-reveal] {
    opacity: 0;
    transform: translateY(12px);
  }
  [data-reveal].is-revealed {
    opacity: 1;
    transform: none;
    transition: opacity 0.32s var(--ease), transform 0.32s var(--ease);
  }
}

[data-chapter-spy] a[href^="#"].is-active {
  color: var(--paper);
  border-left-color: var(--signal);
}

[data-disclosure-panel] {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s var(--ease);
}
[data-disclosure-panel] > * { overflow: hidden; min-height: 0; }
[data-disclosure-panel].is-open { grid-template-rows: 1fr; }

/* ---------- 11. 焦点与无障碍 ---------- */
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 3px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 12. 响应式 ---------- */
@media (max-width: 1080px) {
  .masthead__hint { display: none; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 118px; }

  .railbar__label { display: none; }
  .nav-toggle { display: inline-flex; }

  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-left: 0;
    display: block;
    padding: 6px var(--gutter) 20px;
    background-color: var(--ink-deep);
    border-bottom: 1px solid rgba(201, 195, 182, 0.18);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    transition: max-height 0.3s var(--ease), visibility 0.3s var(--ease);
  }

  .nav[data-open] {
    max-height: 70vh;
    overflow-y: auto;
    visibility: visible;
  }

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

  .nav__list a {
    padding: 15px 0;
    font-size: 16px;
    border-bottom: 1px solid rgba(201, 195, 182, 0.12);
  }

  .nav__list a::after {
    left: 0;
    right: auto;
    bottom: 8px;
    width: 26px;
  }
}

@media (max-width: 620px) {
  body { font-size: 16px; }
  .brand__tag { display: none; }
  .footer__grid { grid-template-columns: 1fr; }
  .footer__legal { flex-direction: column; align-items: flex-start; }
  .footer__list--contact li { grid-template-columns: 40px 1fr; }
}

/* ---------- 13. 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .readout__bar { transition: none !important; }
}