/* ============================================================
   百利宫BLG · 共享样式表  /assets/site.css
   夜间烫金目录：墨蓝作底，暖金作线，瓷白作字
   ============================================================ */

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

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

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, blockquote, dl, dd {
  margin: 0;
}

ul, ol { padding: 0; list-style: none; }

img, picture, svg, video {
  display: block;
  max-width: 100%;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button { background: none; border: 0; }

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

/* ---------- 2. 变量 ---------- */
:root {
  --ink:        #0A1A2F;
  --indigo:     #16324F;
  --pine:       #123F3C;
  --wine:       #4A1622;
  --gold:       #D8A94E;
  --gold-light: #F2DCA6;
  --porcelain:  #F6F2E9;
  --cinnabar:   #C8402F;
  --mist:       #8C96A8;
  --paper:      #FBF8F1;

  --rail-line:  rgba(216, 169, 78, 0.34);
  --hair-line:  rgba(246, 242, 233, 0.10);

  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --font-sans:  "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-mono:  "IBM Plex Mono", "JetBrains Mono", "SFMono-Regular", ui-monospace, "Courier New", monospace;

  --shell-max: 1360px;
  --header-h:  78px;
  --radius-lg: 14px;
  --radius-sm: 6px;

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

@media (max-width: 960px) {
  :root { --header-h: 66px; }
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--ink);
  color: var(--porcelain);
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 300;
  line-height: 1.18;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.4rem, 6vw, 5.4rem); }
h2 { font-size: clamp(1.8rem, 3.6vw, 3.1rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.6rem); line-height: 1.35; }
h4 { font-size: 1.05rem; line-height: 1.5; }

strong { font-weight: 500; }

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

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

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
}

.index-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  letter-spacing: 0.18em;
  color: var(--gold);
  display: inline-block;
}

.rule-gold {
  height: 1px;
  border: 0;
  margin: 0;
  background: linear-gradient(90deg, var(--gold) 0%, rgba(216, 169, 78, 0) 72%);
}

.lede {
  font-size: clamp(1.05rem, 1.5vw, 1.22rem);
  line-height: 1.8;
  color: rgba(246, 242, 233, 0.86);
  max-width: 62ch;
}

.prose { max-width: 72ch; }
.prose p + p { margin-top: 1.1em; }
.prose h2 { margin: 2.2em 0 0.7em; }
.prose h3 { margin: 1.8em 0 0.6em; }
.prose ul, .prose ol { margin: 1.1em 0; padding-left: 1.3em; }
.prose ul li { list-style: none; position: relative; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: -1.05em;
  top: 0.85em;
  width: 6px; height: 1px;
  background: var(--gold);
}
.prose ol { list-style: decimal; }
.prose a {
  color: var(--gold-light);
  border-bottom: 1px solid rgba(216, 169, 78, 0.5);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.prose a:hover { color: var(--gold); border-bottom-color: var(--gold); }

/* ---------- 4. 容器与主体 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: 28px;
}

.shell--narrow { max-width: 820px; }

#main-content { display: block; padding-top: var(--header-h); }
#main-content[data-flush] { padding-top: 0; }

@media (max-width: 640px) {
  .shell { padding-inline: 20px; }
}

/* ---------- 5. 页头 ---------- */
.skip-link {
  position: absolute;
  left: 20px;
  top: -120px;
  z-index: 300;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  background: var(--gold);
  color: #0A1A2F;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.1em;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 14px; }

.site-header {
  position: fixed;
  top: 0; right: 0; left: 0;
  z-index: 200;
  color: var(--porcelain);
  background-color: transparent;
  transition: background-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: linear-gradient(
    180deg,
    rgba(10, 26, 47, 0.94) 0%,
    rgba(10, 26, 47, 0.58) 62%,
    rgba(10, 26, 47, 0) 100%
  );
  transition: opacity 0.3s var(--ease);
}

.site-header[data-scrolled] {
  background-color: var(--indigo);
  box-shadow:
    0 1px 0 0 var(--rail-line),
    0 22px 46px -34px #000000;
}
.site-header[data-scrolled]::before { opacity: 0; }

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 22px;
  width: 100%;
  max-width: var(--shell-max);
  min-height: var(--header-h);
  margin-inline: auto;
  padding: 12px 28px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 1px;
  flex: 0 1 auto;
  min-width: 0;
  margin-right: auto;
}

.brand-mark {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.1rem, 1.6vw, 1.42rem);
  letter-spacing: 0.06em;
  color: var(--porcelain);
  white-space: nowrap;
}

.brand-mark::after {
  content: "";
  display: block;
  width: 26px;
  height: 1px;
  margin-top: 7px;
  background: var(--gold);
  transition: width 0.24s var(--ease);
}
.brand:hover .brand-mark::after { width: 54px; }

.brand-tagline {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: rgba(246, 242, 233, 0.58);
  white-space: nowrap;
}

.site-nav { flex: 0 1 auto; }

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: inline-block;
  padding: 9px 10px 10px;
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: rgba(246, 242, 233, 0.78);
  border-bottom: 2px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.nav-link:hover,
.nav-link:focus-visible {
  color: var(--gold-light);
  border-bottom-color: var(--gold);
}
.nav-link[aria-current="page"] {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: none;
}

.tool-btn {
  padding: 9px 14px;
  border: 1px solid rgba(216, 169, 78, 0.42);
  border-radius: var(--radius-sm);
  color: var(--gold-light);
  font-size: 12px;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}
.tool-btn:hover,
.tool-btn:focus-visible {
  background-color: rgba(216, 169, 78, 0.14);
  border-color: var(--gold);
  color: var(--gold-light);
}

.tool-link {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
  border-bottom: 1px solid rgba(216, 169, 78, 0.5);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.tool-link:hover,
.tool-link:focus-visible {
  color: var(--gold-light);
  border-bottom-color: var(--gold-light);
}

.copy-status {
  position: absolute;
  right: 28px;
  top: calc(100% + 10px);
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  background: var(--paper);
  color: #1B2433;
  font-size: 12px;
  letter-spacing: 0.1em;
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}
.copy-status[data-visible] {
  opacity: 1;
  transform: translateY(0);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 46px;
  height: 38px;
  padding: 0 11px;
  border: 1px solid rgba(216, 169, 78, 0.42);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.2s var(--ease);
}
.nav-toggle:hover { border-color: var(--gold); }

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--gold);
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(6.5px) 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(-6.5px) rotate(-45deg);
}

@media (max-width: 1100px) {
  .nav-link { padding-inline: 7px; font-size: 12px; letter-spacing: 0.1em; }
}

@media (max-width: 960px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    left: 0; right: 0; top: 100%;
    max-height: 0;
    overflow: hidden;
    background-color: var(--indigo);
    border-top: 1px solid var(--rail-line);
    box-shadow: 0 30px 50px -36px #000000;
    transition: max-height 0.3s var(--ease);
  }
  .site-nav[data-open] {
    max-height: min(72vh, 540px);
    overflow-y: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px 20px 22px;
  }

  .nav-link {
    display: block;
    width: 100%;
    padding: 13px 10px;
    font-size: 14px;
    letter-spacing: 0.08em;
    border-bottom: 1px solid var(--hair-line);
    border-left: 3px solid transparent;
  }
  .nav-link:hover,
  .nav-link:focus-visible {
    border-bottom-color: var(--hair-line);
    border-left-color: var(--gold);
  }
  .nav-link[aria-current="page"] {
    border-bottom-color: rgba(216, 169, 78, 0.32);
    border-left-color: var(--gold);
  }
}

@media (max-width: 720px) {
  .header-inner { padding: 10px 20px; gap: 12px; }
  .tool-btn { display: none; }
  .brand-tagline { display: none; }
  .copy-status { right: 20px; }
}

@media (max-width: 460px) {
  .tool-link { display: none; }
}

/* ---------- 6. 分屏首屏骨架 ---------- */
.split-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  align-items: center;
  gap: clamp(28px, 5vw, 72px);
  width: 100%;
  max-width: var(--shell-max);
  min-height: 92vh;
  margin-inline: auto;
  padding: calc(var(--header-h) + 56px) 28px 76px;
}

.split-hero__copy { max-width: 620px; }

.split-hero__visual {
  position: relative;
  min-height: 320px;
}

@media (max-width: 900px) {
  .split-hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding: calc(var(--header-h) + 40px) 20px 56px;
  }
  .split-hero__visual { min-height: 260px; }
}

/* ---------- 7. 色带与章节 ---------- */
.band { padding: clamp(76px, 10vw, 148px) 0; }
.band--indigo { background-color: var(--indigo); }
.band--pine   { background-color: var(--pine); }
.band--wine   { background-color: var(--wine); }

.band--paper {
  background-color: var(--paper);
  color: #33405A;
}
.band--paper h1,
.band--paper h2,
.band--paper h3,
.band--paper h4 { color: var(--ink); }
.band--paper .lede { color: #3C4A63; }
.band--paper .section-index,
.band--paper .index-num { color: #8A6A1F; }
.band--paper .card {
  background-color: rgba(10, 26, 47, 0.035);
  border-color: rgba(10, 26, 47, 0.12);
}
.band--paper .card:hover,
.band--paper .card:focus-within {
  background-color: rgba(10, 26, 47, 0.06);
  border-color: rgba(138, 106, 31, 0.5);
}
.band--paper .tag {
  border-color: rgba(138, 106, 31, 0.45);
  background-color: rgba(216, 169, 78, 0.16);
  color: #6B5214;
}
.band--paper .breadcrumb-list { color: #6B7688; }
.band--paper .breadcrumb-link {
  color: #3C4A63;
  border-bottom-color: rgba(60, 74, 99, 0.35);
}
.band--paper .breadcrumb-link:hover { color: #8A6A1F; }
.band--paper .breadcrumb-sep { color: rgba(138, 106, 31, 0.55); }
.band--paper .breadcrumb-current { color: #8A6A1F; }
.band--paper .rule-gold {
  background: linear-gradient(90deg, #8A6A1F 0%, rgba(138, 106, 31, 0) 72%);
}

.section-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-bottom: 38px;
}

.section-index {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.section-title {
  flex: 1 1 auto;
  min-width: 240px;
}

.section-note {
  flex: 0 1 auto;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 8. 卡片与标签 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(258px, 1fr));
  gap: 24px;
}

.card {
  position: relative;
  padding: 28px 24px 30px;
  border: 1px solid var(--hair-line);
  border-radius: var(--radius-lg);
  background-color: rgba(246, 242, 233, 0.045);
  transition:
    transform 0.22s var(--ease),
    border-color 0.22s var(--ease),
    background-color 0.22s var(--ease),
    box-shadow 0.22s var(--ease);
}
.card:hover,
.card:focus-within {
  transform: translateY(-4px);
  border-color: rgba(216, 169, 78, 0.5);
  background-color: rgba(246, 242, 233, 0.075);
  box-shadow: 0 24px 44px -32px #000000;
}

.card-meta {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.card-title {
  margin-bottom: 10px;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1.22rem;
  line-height: 1.4;
  letter-spacing: 0;
}

.card-text {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(246, 242, 233, 0.76);
}

.tag {
  display: inline-block;
  padding: 5px 11px;
  border: 1px solid rgba(216, 169, 78, 0.4);
  border-radius: var(--radius-sm);
  background-color: rgba(216, 169, 78, 0.08);
  color: var(--gold-light);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  line-height: 1.6;
}

.tag--cinnabar {
  border-color: rgba(200, 64, 47, 0.55);
  background-color: var(--cinnabar);
  color: var(--porcelain);
}

/* ---------- 9. 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--hair-line);
  border-radius: var(--radius-lg);
  background-color: var(--indigo);
  background-image: linear-gradient(150deg, #16324F 0%, #0A1A2F 72%);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(255, 255, 255, 0.028) 0 1px,
    rgba(255, 255, 255, 0) 1px 4px
  );
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--portrait { aspect-ratio: 3 / 4; }
.media-frame--tilt { transform: rotate(-1.4deg); }

/* ---------- 10. 按钮与面包屑 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition:
    background-color 0.2s var(--ease),
    border-color 0.2s var(--ease),
    color 0.2s var(--ease),
    transform 0.2s var(--ease);
}

.btn--gold {
  background-color: var(--gold);
  color: #0A1A2F;
}
.btn--gold:hover,
.btn--gold:focus-visible {
  background-color: var(--gold-light);
  transform: translateY(-2px);
}

.btn--ghost {
  border-color: rgba(246, 242, 233, 0.3);
  color: var(--porcelain);
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--gold);
  color: var(--gold-light);
  transform: translateY(-2px);
}

.breadcrumb { padding: 26px 0 0; }

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.breadcrumb-link {
  padding-bottom: 2px;
  color: rgba(246, 242, 233, 0.72);
  border-bottom: 1px dotted rgba(246, 242, 233, 0.32);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.breadcrumb-link:hover,
.breadcrumb-link:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.breadcrumb-sep { color: rgba(216, 169, 78, 0.5); }

.breadcrumb-current { color: var(--gold); }

/* ---------- 11. 页脚 ---------- */
.site-footer {
  background-image: linear-gradient(180deg, #0A1A2F 0%, #081324 100%);
  border-top: 1px solid var(--rail-line);
  color: rgba(246, 242, 233, 0.82);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) minmax(0, 1.5fr) minmax(220px, 0.9fr);
  gap: clamp(32px, 4vw, 64px);
  align-items: start;
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 76px 28px 52px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-brand-mark {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2vw, 1.7rem);
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--porcelain);
}

.footer-brand-note {
  max-width: 24ch;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(246, 242, 233, 0.62);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(110px, 1fr));
  gap: 28px;
}

.footer-col-title {
  margin-bottom: 16px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  line-height: 1.4;
  color: var(--gold);
}

.footer-list li + li { margin-top: 10px; }

.footer-link {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 14.5px;
  color: rgba(246, 242, 233, 0.78);
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.footer-link:hover,
.footer-link:focus-visible {
  color: var(--gold-light);
  border-bottom-color: rgba(216, 169, 78, 0.6);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-contact-line {
  font-size: 14px;
  line-height: 1.9;
  color: rgba(246, 242, 233, 0.74);
  word-break: break-word;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 28px;
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 24px 28px 48px;
  border-top: 1px solid var(--hair-line);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.footer-legal { color: rgba(246, 242, 233, 0.7); }
.footer-copy { font-variant-numeric: tabular-nums; }
.footer-note { flex: 1 1 260px; }

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

@media (max-width: 640px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 36px;
    padding: 56px 20px 40px;
  }
  .footer-nav { grid-template-columns: 1fr 1fr; gap: 24px; }
  .footer-base { padding: 22px 20px 40px; }
}

/* ---------- 12. 滚动显现 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.24s var(--ease), transform 0.24s var(--ease);
}
.js [data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 13. 动效降级 ---------- */
@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;
    scroll-behavior: auto !important;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .card:hover,
  .card:focus-within,
  .btn:hover,
  .btn:focus-visible {
    transform: none;
  }
}