/* ============================================================
   凯时平台中心 · 共享样式表  /assets/site.css
   设计语言：高原长轴 × 信息长卷
   色彩骨架：纸白阅读面 + 湖蓝地标 + 暮紫深区 + 砂金刻度 + 经幡橙行动
   ============================================================ */

/* ---------- 1 · reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
}
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd, fieldset { 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; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
:focus-visible { outline: 2px solid var(--flag); outline-offset: 3px; border-radius: 3px; }

/* ---------- 2 · 变量 ---------- */
:root {
  /* 色彩 */
  --ink-deep:   #141B2E;  /* 暮紫深底 */
  --lake:       #1E7FA8;  /* 湖蓝主色 */
  --lake-deep:  #12516B;  /* 湖蓝深阶 */
  --lake-pale:  #A8D3E2;  /* 湖蓝浅阶 */
  --dusk:       #4B3A73;  /* 高原暮紫 */
  --dusk-bright:#8A6FD1;  /* 暮紫亮阶 */
  --sand:       #C9A227;  /* 砂金 */
  --sand-ink:   #8A6F16;  /* 砂金（小字可读版） */
  --flag:       #E8823A;  /* 经幡橙 */
  --paper:      #F5F2EA;  /* 纸白 */
  --paper-2:    #E3DED2;  /* 纸灰 */
  --ink:        #22262B;  /* 墨黑 */
  --muted:      #5C6470;  /* 次级灰 */
  --line:       rgba(30, 127, 168, .22);
  --line-strong:rgba(30, 127, 168, .40);

  /* 排版 */
  --font-title: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body:  "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono:  "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

  /* 尺度 */
  --gutter: 6vw;
  --maxw: 1240px;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --stack-shadow: 6px 6px 0 0 var(--paper-2);
}

@media (max-width: 720px) {
  :root { --gutter: 20px; }
}

/* ---------- 3 · 基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.9;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    radial-gradient(1200px 600px at 12% -8%, rgba(168, 211, 226, .28), transparent 62%),
    radial-gradient(900px 520px at 92% 4%, rgba(75, 58, 115, .10), transparent 60%);
  background-repeat: no-repeat;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  padding-top: clamp(86px, 8.5vw, 104px);
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-title);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.18;
  color: var(--ink);
}
h1 { font-size: clamp(38px, 7.2vw, 108px); }
h2 { font-size: clamp(26px, 3.4vw, 44px); }
h3 { font-size: clamp(19px, 1.7vw, 24px); letter-spacing: -.01em; }

strong { font-weight: 700; }
::selection { background: rgba(201, 162, 39, .35); color: var(--ink); }

.mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ---------- 4 · 布局容器 ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.prose { max-width: 38em; }
.prose p + p { margin-top: 1.1em; }
.prose > * + h3 { margin-top: 1.8em; }
.prose > * + ul { margin-top: .9em; }
.prose ul li {
  position: relative;
  padding-left: 1.4em;
  margin-top: .55em;
}
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .82em;
  width: 9px;
  height: 1.5px;
  background: var(--sand);
}

.lede {
  font-size: clamp(17px, 1.25vw, 19px);
  line-height: 1.85;
  color: var(--muted);
  max-width: 34em;
}

/* ---------- 5 · 章节地标 ---------- */
.section { padding-block: clamp(64px, 8vw, 104px); }
.section--tight { padding-block: clamp(44px, 5vw, 68px); }
.section + .section { border-top: 1px solid var(--line); }

.section-head { margin-bottom: clamp(32px, 4vw, 52px); }
.section-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--sand-ink);
  margin-bottom: 12px;
}
.section-title {
  position: relative;
  padding-left: 20px;
  max-width: 22em;
}
.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: .16em;
  bottom: .16em;
  width: 4px;
  border-radius: 2px;
  background: var(--sand);
}
.section-head .lede { margin-top: 16px; padding-left: 20px; }

/* ---------- 6 · 网格 ---------- */
.grid { display: grid; gap: 28px; }
.grid[data-cols="2"] { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid[data-cols="3"] { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid[data-cols="4"] { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 1000px) {
  .grid[data-cols="3"], .grid[data-cols="4"] { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .grid[data-cols="2"], .grid[data-cols="3"], .grid[data-cols="4"] { grid-template-columns: 1fr; }
}

/* ---------- 7 · 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: .01em;
  cursor: pointer;
  transition: transform .2s var(--ease), background-color .2s var(--ease),
              border-color .2s var(--ease), color .2s var(--ease), box-shadow .2s var(--ease);
}
.btn-primary { background: var(--lake); color: #fff; box-shadow: 0 12px 26px -16px rgba(30, 127, 168, .95); }
.btn-primary:hover { background: var(--lake-deep); transform: translateY(-2px); }
.btn-accent { background: var(--flag); color: #24150A; box-shadow: 0 12px 26px -16px rgba(232, 130, 58, .95); }
.btn-accent:hover { background: #F0924E; transform: translateY(-2px); }
.btn-ghost { border-color: rgba(34, 38, 43, .24); color: var(--ink); }
.btn-ghost:hover { border-color: var(--lake); color: var(--lake-deep); transform: translateY(-2px); }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }

/* ---------- 8 · 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
  padding-block: 20px 0;
}
.breadcrumb li { display: flex; align-items: center; }
.breadcrumb li + li::before { content: "/"; margin-right: 8px; color: var(--line-strong); }
.breadcrumb a { color: var(--lake-deep); text-decoration: underline; text-underline-offset: 3px; }
.breadcrumb a:hover { color: var(--flag); }

/* ---------- 9 · 卡片与标签 ---------- */
.card {
  position: relative;
  background: #FFFDF8;
  border: 1px solid rgba(34, 38, 43, .10);
  border-left: 4px solid var(--sand);
  border-radius: 3px;
  padding: 26px 24px 24px;
  box-shadow: var(--stack-shadow);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), border-left-color .2s var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 6px 10px 0 0 var(--paper-2);
  border-left-color: var(--flag);
}
.card h3 { margin-bottom: 10px; }
.card p { font-size: 15.5px; line-height: 1.8; color: var(--muted); }
.card > p + .card-meta { margin-top: 18px; }

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--sand-ink);
}
.card-meta > span { white-space: nowrap; }

.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 11px;
  border-radius: 999px;
  background: var(--lake-pale);
  color: var(--lake-deep);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .02em;
  line-height: 1.6;
}
.tag-accent { background: rgba(232, 130, 58, .18); color: #8E4512; }
.tag-sand { background: rgba(201, 162, 39, .20); color: var(--sand-ink); }
.tag-dusk { background: rgba(138, 111, 209, .20); color: #3E2F66; }

/* ---------- 10 · 矢量图占位容器 ---------- */
.media-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-radius: 3px;
  border: 1px solid var(--line);
  background:
    linear-gradient(148deg, #E8F3F7 0%, var(--lake-pale) 46%, #F2EFE6 100%);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    180deg,
    transparent 0 22px,
    rgba(18, 81, 107, .16) 22px 23px
  );
}
.media-frame > img,
.media-frame > svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame[data-ratio="4/3"] { aspect-ratio: 4 / 3; }
.media-frame[data-ratio="1/1"]  { aspect-ratio: 1 / 1; }
.media-frame[data-tone="dusk"] {
  background: linear-gradient(148deg, #2A2145 0%, var(--dusk) 52%, var(--lake-deep) 100%);
}
.media-frame[data-tone="dusk"]::after {
  background-image: repeating-linear-gradient(
    180deg,
    transparent 0 26px,
    rgba(168, 211, 226, .13) 26px 27px
  );
}

/* ---------- 11 · 头部：悬浮胶囊导航 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 80;
  padding: 18px var(--gutter) 0;
  pointer-events: none;
}
.nav-shell {
  position: relative;
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  pointer-events: auto;
}
.nav-capsule {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 12px 10px 20px;
  border-radius: 999px;
  border: 1px solid rgba(168, 211, 226, .20);
  background: rgba(20, 27, 46, .93);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  backdrop-filter: blur(16px) saturate(140%);
  box-shadow: 0 22px 46px -28px rgba(20, 27, 46, .95);
  color: var(--paper);
  transition: padding .3s var(--ease), background-color .3s var(--ease), box-shadow .3s var(--ease);
}
.site-header[data-shrink="true"] .nav-capsule {
  padding: 7px 10px 7px 16px;
  background: rgba(20, 27, 46, .98);
  box-shadow: 0 18px 40px -26px rgba(20, 27, 46, 1);
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 16px;
  letter-spacing: .015em;
  color: var(--paper);
  white-space: nowrap;
}
.brand-dot {
  width: 11px;
  height: 11px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--lake);
  box-shadow: 0 0 0 3px rgba(30, 127, 168, .30), 0 0 14px rgba(168, 211, 226, .75);
}
.brand-text { display: inline-block; }

/* 导航 */
.nav { flex: 1 1 auto; display: flex; justify-content: center; }
.nav-list { display: flex; align-items: center; gap: 2px; }
.nav-list a {
  display: block;
  padding: 9px 14px;
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 500;
  line-height: 1.25;
  color: rgba(245, 242, 234, .78);
  white-space: nowrap;
  transition: background-color .2s var(--ease), color .2s var(--ease);
}
.nav-list a:hover { background: rgba(168, 211, 226, .16); color: #FFFFFF; }
.nav-list a[aria-current="page"] {
  background: var(--lake);
  color: #FFFFFF;
  box-shadow: inset 0 0 0 1px rgba(168, 211, 226, .35);
}

/* 尾部 */
.nav-tail { flex: 0 0 auto; display: flex; align-items: center; gap: 10px; }
.nav-icon-link {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  color: rgba(245, 242, 234, .82);
  border: 1px solid rgba(168, 211, 226, .22);
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}
.nav-icon-link:hover {
  color: #FFFFFF;
  border-color: var(--lake-pale);
  background: rgba(30, 127, 168, .38);
}
.batch-chip {
  display: inline-block;
  padding: 6px 13px;
  border-radius: 999px;
  background: var(--sand);
  color: #1B1608;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  white-space: nowrap;
}

/* 移动按钮 */
.nav-toggle {
  display: none;
  position: relative;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid rgba(168, 211, 226, .30);
  color: var(--paper);
  transition: background-color .2s var(--ease), border-color .2s var(--ease);
}
.nav-toggle:hover { background: rgba(30, 127, 168, .38); }
.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  position: absolute;
  left: 50%;
  width: 16px;
  height: 1.6px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .25s var(--ease), opacity .2s var(--ease);
}
.nav-toggle-bars { top: 50%; margin: -0.8px 0 0 -8px; }
.nav-toggle-bars::before,
.nav-toggle-bars::after { content: ""; left: 0; }
.nav-toggle-bars::before { top: -5px; }
.nav-toggle-bars::after  { top: 5px; }
.site-header[data-open="true"] .nav-toggle-bars { background: transparent; }
.site-header[data-open="true"] .nav-toggle-bars::before { transform: translateY(5px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle-bars::after  { transform: translateY(-5px) rotate(-45deg); }

/* 跳转链接 */
.skip-link {
  position: absolute;
  top: 10px;
  left: var(--gutter);
  z-index: 200;
  padding: 10px 20px;
  border-radius: 999px;
  background: var(--flag);
  color: #24150A;
  font-size: 14px;
  font-weight: 700;
  transform: translateY(-180%);
  transition: transform .2s var(--ease);
  pointer-events: auto;
}
.skip-link:focus-visible { transform: translateY(0); outline-offset: 3px; }

/* ---------- 12 · 头部响应式 ---------- */
@media (max-width: 1080px) {
  .nav-list a { padding: 9px 11px; font-size: 14px; }
  .batch-chip { font-size: 11px; padding: 5px 10px; }
}
@media (max-width: 960px) {
  .site-header { padding-top: 14px; }
  .nav-capsule { padding: 9px 10px 9px 16px; }
  .nav-toggle { display: block; }
  .nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    display: none;
    padding: 10px;
    border-radius: 24px;
    border: 1px solid rgba(168, 211, 226, .20);
    background: rgba(20, 27, 46, .98);
    -webkit-backdrop-filter: blur(16px) saturate(140%);
    backdrop-filter: blur(16px) saturate(140%);
    box-shadow: 0 34px 60px -32px rgba(0, 0, 0, .9);
  }
  .site-header[data-open="true"] .nav {
    display: block;
    animation: navDrop .28s var(--ease) both;
  }
  @keyframes navDrop {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
  }
  .nav-list { flex-direction: column; align-items: stretch; gap: 2px; }
  .nav-list a {
    padding: 13px 16px;
    border-radius: 14px;
    font-size: 16px;
    font-weight: 600;
  }
  .nav-list a[aria-current="page"] { background: var(--lake); }
  .nav-icon-link { display: none; }
}
@media (max-width: 420px) {
  .brand-text { font-size: 14.5px; }
  .brand-dot { width: 9px; height: 9px; }
  .batch-chip { display: none; }
}

/* ---------- 13 · 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(72px, 9vw, 128px);
  border-top: 3px solid var(--sand);
  background: var(--ink-deep);
  color: rgba(245, 242, 234, .78);
  padding: clamp(56px, 6vw, 84px) var(--gutter) 0;
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(180deg, transparent 0 46px, rgba(168, 211, 226, .065) 46px 47px),
    radial-gradient(760px 340px at 88% 0%, rgba(138, 111, 209, .22), transparent 68%),
    radial-gradient(620px 300px at 4% 100%, rgba(30, 127, 168, .26), transparent 70%);
}
.footer-inner {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: clamp(36px, 4.5vw, 56px);
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
}

.footer-masthead { max-width: 40em; }
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(20px, 2vw, 26px);
  letter-spacing: -.01em;
  color: #FFFFFF;
}
.footer-tagline {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 242, 234, .60);
  max-width: 30em;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 34px 28px;
}
.footer-col-title {
  position: relative;
  margin-bottom: 18px;
  padding-left: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  line-height: 1.5;
  color: var(--lake-pale);
}
.footer-col-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: .2em;
  bottom: .2em;
  width: 4px;
  border-radius: 2px;
  background: var(--sand);
}
.footer-list > li { padding-block: 6px; }
.footer-list a {
  display: inline-block;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(245, 242, 234, .74);
  transition: color .2s var(--ease);
}
.footer-list a:hover {
  color: #FFFFFF;
  text-decoration: underline;
  text-decoration-color: var(--sand);
  text-underline-offset: 4px;
}
.footer-note {
  display: inline-block;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(245, 242, 234, .50);
}
.footer-contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.footer-value {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .03em;
  color: rgba(245, 242, 234, .86);
  overflow-wrap: anywhere;
}
.copy-btn {
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid rgba(201, 162, 39, .55);
  color: var(--sand);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .06em;
  line-height: 1.7;
  transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}
.copy-btn:hover { background: var(--sand); color: #1B1608; border-color: var(--sand); }
.copy-btn[data-copied="true"] {
  background: var(--flag);
  border-color: var(--flag);
  color: #24150A;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-block: 20px 28px;
  border-top: 1px solid rgba(168, 211, 226, .16);
}
.footer-stamp {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(245, 242, 234, .48);
}

@media (max-width: 900px) {
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 520px) {
  .footer-cols { grid-template-columns: 1fr; gap: 30px; }
  .footer-base { flex-direction: column; align-items: flex-start; }
}

/* ---------- 14 · JS 注入元件 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  right: 0;
  width: 3px;
  height: 100%;
  z-index: 120;
  transform-origin: 50% 0;
  transform: scaleY(0);
  background: linear-gradient(180deg, var(--sand) 0%, var(--flag) 100%);
  pointer-events: none;
}

.to-top {
  position: fixed;
  right: 20px;
  bottom: 26px;
  z-index: 90;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--dusk);
  color: #FFFFFF;
  border: 1px solid rgba(168, 211, 226, .30);
  box-shadow: 0 18px 34px -16px rgba(75, 58, 115, .95);
  opacity: 0;
  transform: translateY(14px);
  pointer-events: none;
  transition: opacity .28s var(--ease), transform .28s var(--ease),
              background-color .2s var(--ease), border-color .2s var(--ease);
}
.to-top[data-visible] { opacity: 1; transform: translateY(0); pointer-events: auto; }
.to-top:hover { background: var(--dusk-bright); border-color: var(--lake-pale); }

@media (max-width: 640px) {
  .to-top { right: 14px; bottom: 16px; width: 44px; height: 44px; }
}

/* ---------- 15 · 显现动画 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .42s var(--ease) var(--reveal-delay, 0ms),
              transform .42s var(--ease) var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}
html.js [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
  will-change: auto;
}

/* ---------- 16 · 无障碍偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  html.js [data-reveal] {
    transform: none;
    transition: opacity .2s linear var(--reveal-delay, 0ms);
  }
  html.js [data-reveal][data-revealed] { transform: none; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
  .card:hover,
  .btn:hover,
  .to-top { transform: none; }
}

@media print {
  .site-header, .site-footer, .scroll-progress, .to-top { display: none; }
  body { padding-top: 0; background: #fff; }
}