/* ============================================================
   凯时平台简体中文站 · 共享样式 /assets/site.css
   结构：reset → 变量 → 基础 → 排版 → 工具 → 组件 → 头部 → 页脚 → 响应式 → 动效
   ============================================================ */

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; }
h1, h2, h3, h4, h5, p, figure, blockquote, ol, ul, dl, dd { margin: 0; }
ol, ul { list-style: none; padding: 0; }
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { background: none; border: 0; cursor: pointer; font: inherit; color: inherit; }
table { border-collapse: collapse; border-spacing: 0; width: 100%; }
:focus-visible { outline: 2px solid #D99A2B; outline-offset: 3px; }

/* ---------- 变量 ---------- */
:root {
  --deep: #061A2B;
  --deep-2: #04121F;
  --panel: #0B2A43;
  --paper: #F6F3EA;
  --ink: #0B0F14;
  --amber: #D99A2B;
  --coral: #FF6F4A;
  --celadon: #2F8F7A;
  --cinnabar: #B73A3A;
  --mist: #8A94A6;
  --blueprint: #7CC7E8;

  --rail: 236px;
  --shell: 1240px;
  --bottom-bar: 64px;

  --font-head: "Noto Sans SC Condensed Black", "Source Han Sans Heavy", system-ui, sans-serif;
  --font-body: "Source Han Serif SC", "Noto Serif SC", "Songti SC", serif;
  --font-ui: "Noto Sans SC", "Source Han Sans SC", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", SFMono-Regular, monospace;

  --line: rgba(124, 199, 232, 0.2);
  --line-soft: rgba(124, 199, 232, 0.12);
  --line-ink: rgba(11, 15, 20, 0.16);
}

html { --accent-region: var(--celadon); }
html[data-area="广州"],
html[data-area="深圳"] { --accent-region: var(--cinnabar); }

/* ---------- 基础 ---------- */
body {
  background-color: var(--deep);
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 88px 88px, 88px 88px;
  background-attachment: fixed;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.78;
  padding-bottom: calc(var(--bottom-bar) + 22px);
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(120% 80% at 12% 0%, rgba(11, 42, 67, 0.85), transparent 62%);
  z-index: 0;
}
.site-header, .site-footer, main, .scroll-progress { position: relative; z-index: 1; }
.site-header { z-index: 90; }
.site-footer { z-index: 2; }

/* ---------- 排版 ---------- */
h1, .h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(38px, 6.2vw, 82px);
  line-height: 1.02;
  letter-spacing: 0.01em;
}
h2, .h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.12;
  letter-spacing: 0.01em;
}
h3, .h3 {
  font-family: var(--font-ui);
  font-weight: 800;
  font-size: clamp(19px, 2.1vw, 27px);
  line-height: 1.3;
}
h4, .h4 {
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.45;
}
p { text-wrap: pretty; }
.lead {
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.7;
  color: var(--paper);
}
.prose { max-width: 68ch; font-size: 17px; line-height: 1.88; }
.prose p + p { margin-top: 1em; }
.prose strong { color: var(--amber); font-weight: 700; }
.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--amber);
  display: block;
}
.note {
  font-family: var(--font-ui);
  font-size: 13px;
  line-height: 1.72;
  color: var(--mist);
  border-left: 2px solid rgba(124, 199, 232, 0.45);
  padding-left: 12px;
}
.stamp {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--blueprint);
  border: 1px dashed rgba(124, 199, 232, 0.45);
  padding: 3px 9px;
}
.rule {
  border: 0;
  border-top: 1px solid var(--line);
  margin: clamp(24px, 4vw, 48px) 0;
}

/* ---------- 布局工具 ---------- */
.container {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 clamp(18px, 4vw, 44px);
}
.section { padding: clamp(40px, 6vw, 92px) 0; }
.section--tight { padding: clamp(24px, 3.5vw, 52px) 0; }
.stack { display: flex; flex-direction: column; gap: clamp(14px, 2vw, 26px); }
.stack--sm { gap: 10px; }
.grid { display: grid; gap: clamp(16px, 2.4vw, 32px); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-ledger { grid-template-columns: minmax(0, 2.1fr) minmax(0, 1fr); }
.grid-ledger--flip { grid-template-columns: minmax(0, 1fr) minmax(0, 2.1fr); }
.offset-up { margin-top: clamp(-60px, -5vw, -24px); }

/* ---------- 面板 / 纸张 ---------- */
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: clamp(20px, 3vw, 34px);
}
.paper {
  position: relative;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--line-ink);
  box-shadow: 10px 10px 0 rgba(3, 14, 24, 0.62), -1px -1px 0 rgba(124, 199, 232, 0.18);
  padding: clamp(22px, 3.6vw, 48px);
}
.paper::after {
  content: "";
  position: absolute;
  inset: 7px;
  border: 1px solid rgba(11, 15, 20, 0.07);
  pointer-events: none;
}
.paper h1, .paper h2, .paper h3, .paper h4 { color: var(--ink); }
.paper .note { color: #4C5566; border-left-color: rgba(11, 15, 20, 0.28); }
.paper .eyebrow { color: var(--cinnabar); }
.paper--bleed { box-shadow: 16px 16px 0 rgba(3, 14, 24, 0.62); }

/* ---------- 标签 / 按钮 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 4px 10px;
  border: 1px solid currentColor;
  white-space: nowrap;
}
.tag-east { color: var(--celadon); }
.tag-south { color: var(--cinnabar); }
.tag-amber { color: var(--amber); }
.tag-blue { color: var(--blueprint); }
.tag-coral { color: var(--coral); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  font-family: var(--font-ui);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  border: 1px solid transparent;
  transition: background-color 0.22s ease, color 0.22s ease, border-color 0.22s ease, transform 0.22s ease;
}
.btn-solid { background: var(--amber); color: var(--ink); border-color: var(--amber); }
.btn-solid:hover { background: var(--coral); border-color: var(--coral); transform: translateY(-2px); }
.btn-ghost { border-color: rgba(246, 243, 234, 0.42); color: var(--paper); }
.btn-ghost:hover { border-color: var(--amber); color: var(--amber); transform: translateY(-2px); }
.paper .btn-ghost { border-color: rgba(11, 15, 20, 0.3); color: var(--ink); }
.paper .btn-ghost:hover { border-color: var(--cinnabar); color: var(--cinnabar); }

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding: 18px 0 4px;
  font-family: var(--font-ui);
  font-size: 13px;
  letter-spacing: 0.04em;
}
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 8px; color: var(--mist); }
.breadcrumb li + li::before { content: "/"; margin-right: 8px; color: rgba(124, 199, 232, 0.5); }
.breadcrumb a { color: var(--mist); }
.breadcrumb a:hover { color: var(--amber); }
.breadcrumb [aria-current="page"] { color: var(--blueprint); }

/* ---------- 规格表 ---------- */
.spec-table {
  width: 100%;
  font-family: var(--font-mono);
  font-size: 14px;
  border: 1px solid var(--line-ink);
  background: rgba(255, 255, 255, 0.4);
}
.spec-table th, .spec-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid rgba(11, 15, 20, 0.12);
  vertical-align: top;
}
.spec-table thead th {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
}
.spec-table tbody tr { transition: background-color 0.18s ease; }
.spec-table tbody tr:hover { background: rgba(217, 154, 43, 0.16); }
.spec-table td.is-amber { color: #9A6A11; font-weight: 700; }

/* ---------- 图片占位容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: var(--panel);
  background-image:
    repeating-linear-gradient(45deg, rgba(124, 199, 232, 0.08) 0 10px, transparent 10px 20px);
  border: 1px solid var(--line);
}
.media-frame img { width: 100%; height: 100%; object-fit: cover; }
.media-frame::before {
  content: attr(data-media);
  position: absolute;
  left: 14px;
  top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: rgba(124, 199, 232, 0.6);
}
.media-frame:has(img)::before { display: none; }
.media-frame figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 6px 10px;
  background: rgba(6, 26, 43, 0.88);
  color: var(--blueprint);
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

/* ============================================================
   头部
   ============================================================ */
.skip-link {
  position: fixed;
  left: 16px;
  top: -90px;
  z-index: 400;
  padding: 10px 18px;
  background: var(--amber);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  transition: top 0.18s ease;
}
.skip-link:focus { top: 16px; }

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail);
  background: linear-gradient(180deg, #030F19 0%, #061A2B 45%, #030F19 100%);
  border-right: 1px solid var(--line);
}
.header-rail {
  display: flex;
  flex-direction: column;
  gap: 20px;
  height: 100%;
  padding: 26px 20px 24px;
  overflow-y: auto;
}

.brand { display: flex; flex-direction: column; gap: 8px; }
.brand-mark {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 30px;
  line-height: 1;
  letter-spacing: 0.05em;
  color: var(--paper);
  border-left: 5px solid var(--amber);
  padding-left: 12px;
}
.brand-line {
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.area-axis {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.axis-title {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--blueprint);
  opacity: 0.8;
  margin-bottom: 2px;
}
.axis-btn {
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  padding: 7px 4px;
  border: 1px solid rgba(124, 199, 232, 0.28);
  background: rgba(11, 42, 67, 0.55);
  color: var(--paper);
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}
.axis-btn:hover { border-color: var(--coral); color: #FFFFFF; }
.axis-btn[aria-pressed="true"] {
  background: var(--accent-region);
  border-color: var(--accent-region);
  color: #FFFFFF;
  font-weight: 700;
}

.nav-toggle { display: none; }

.site-nav {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
}
.nav-list { display: flex; flex-direction: column; gap: 2px; }
.nav-link {
  display: grid;
  grid-template-columns: 34px 1fr;
  align-items: center;
  gap: 6px;
  padding: 11px 10px;
  font-family: var(--font-ui);
  font-size: 16px;
  letter-spacing: 0.04em;
  color: rgba(246, 243, 234, 0.78);
  border-left: 2px solid transparent;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.nav-link:hover {
  color: #FFFFFF;
  background: rgba(217, 154, 43, 0.12);
  border-left-color: var(--coral);
  transform: translateX(3px);
}
.nav-link[aria-current="page"] {
  background: var(--paper);
  color: var(--ink);
  font-weight: 700;
  border-left-color: var(--amber);
}
.nav-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--blueprint);
}
.nav-link[aria-current="page"] .nav-idx { color: var(--amber); }
.nav-note {
  margin-top: auto;
  padding: 16px 10px 0;
  font-family: var(--font-ui);
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

.header-utility {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-family: var(--font-ui);
  font-size: 12px;
  line-height: 1.5;
  color: var(--mist);
}
.header-utility .mono { color: var(--blueprint); font-size: 11px; word-break: break-all; }

.nav-mask {
  position: fixed;
  inset: 0;
  background: rgba(3, 12, 20, 0.62);
  z-index: 88;
}
.nav-mask[hidden] { display: none; }

/* ---------- 滚动进度 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--amber), var(--coral));
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
  z-index: 120;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  margin-top: clamp(72px, 10vw, 148px);
  background: linear-gradient(180deg, rgba(4, 18, 31, 0.4), #030F19 34%);
  border-top: 1px solid var(--line);
}
.footer-shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 clamp(18px, 4vw, 44px) 34px;
}
.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  padding: clamp(38px, 5vw, 62px) 0 26px;
  border-bottom: 1px solid var(--line);
}
.footer-brand .brand-mark { font-size: 26px; }
.footer-tagline {
  margin-top: 10px;
  font-family: var(--font-ui);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--mist);
}
.footer-actions { display: flex; flex-wrap: wrap; gap: 12px; }

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1.5fr;
  gap: clamp(24px, 4vw, 54px);
  padding: clamp(30px, 4vw, 48px) 0 12px;
}
.footer-title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--blueprint);
  margin-bottom: 14px;
}
.footer-links { display: flex; flex-direction: column; gap: 9px; }
.footer-links a {
  font-family: var(--font-ui);
  font-size: 15px;
  color: rgba(246, 243, 234, 0.82);
  transition: color 0.18s ease, padding-left 0.18s ease;
}
.footer-links a:hover { color: var(--amber); padding-left: 5px; }
.footer-contact { display: flex; flex-direction: column; gap: 9px; font-size: 15px; color: rgba(246, 243, 234, 0.86); }
.footer-contact .mono { color: var(--amber); font-size: 14px; word-break: break-all; }
.footer-note { margin-top: 12px; font-size: 12px; line-height: 1.7; color: var(--mist); }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 28px;
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-family: var(--font-ui);
  font-size: 13px;
  color: var(--mist);
}
.footer-legal .mono { color: var(--blueprint); }

/* ---------- 底部三档价格与起订量联动条 ---------- */
.price-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 85;
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: var(--bottom-bar);
  padding: 8px clamp(14px, 3vw, 32px);
  background: rgba(3, 15, 25, 0.95);
  border-top: 1px solid rgba(217, 154, 43, 0.45);
}
.price-bar-title {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--blueprint);
  white-space: nowrap;
}
.price-tiers {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1 1 auto;
  overflow-x: auto;
  scrollbar-width: thin;
}
.tier {
  display: flex;
  align-items: baseline;
  gap: 9px;
  flex: 0 0 auto;
  padding: 6px 12px;
  background: rgba(11, 42, 67, 0.72);
  border: 1px solid rgba(217, 154, 43, 0.32);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}
.tier:hover { border-color: var(--coral); background: rgba(11, 42, 67, 0.95); }
.tier-name { font-family: var(--font-ui); font-size: 13px; font-weight: 700; color: var(--paper); }
.tier-price { font-size: 13px; color: var(--amber); }
.tier-moq { font-family: var(--font-mono); font-size: 11px; color: var(--mist); }
.tier[data-active="true"] { border-color: var(--coral); background: rgba(255, 111, 74, 0.16); }

/* ============================================================
   响应式
   ============================================================ */
@media (min-width: 1024px) {
  body { padding-left: var(--rail); }
  .scroll-progress { left: var(--rail); }
  .price-bar { left: var(--rail); }
}

@media (max-width: 1023px) {
  :root { --rail: 0px; }

  .site-header {
    top: 0;
    bottom: auto;
    right: 0;
    width: auto;
    height: 64px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    background: rgba(4, 18, 31, 0.96);
  }
  .header-rail {
    flex-direction: row;
    align-items: center;
    gap: 12px;
    height: 64px;
    padding: 0 16px;
    overflow: visible;
  }
  .brand { flex-direction: row; align-items: center; gap: 10px; flex: 1 1 auto; }
  .brand-mark { font-size: 20px; border-left-width: 4px; padding-left: 9px; }
  .brand-line { display: none; }

  .area-axis {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0;
    border: 0;
  }
  .axis-title { display: none; }
  .axis-btn { padding: 5px 8px; font-size: 12px; }
  .axis-btn:nth-of-type(n + 3) { display: none; }

  .header-utility { display: none; }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border: 1px solid rgba(124, 199, 232, 0.36);
    font-family: var(--font-ui);
    font-size: 13px;
    letter-spacing: 0.1em;
    color: var(--paper);
    flex: 0 0 auto;
    transition: border-color 0.2s ease, color 0.2s ease;
  }
  .nav-toggle:hover { border-color: var(--amber); color: var(--amber); }
  .nav-toggle-bars { position: relative; display: block; width: 16px; height: 2px; background: currentColor; }
  .nav-toggle-bars::before,
  .nav-toggle-bars::after {
    content: "";
    position: absolute;
    left: 0;
    width: 16px;
    height: 2px;
    background: currentColor;
    transition: transform 0.24s ease, top 0.24s ease;
  }
  .nav-toggle-bars::before { top: -5px; }
  .nav-toggle-bars::after { top: 5px; }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 0; transform: rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { top: 0; transform: rotate(-45deg); }

  .site-nav {
    position: fixed;
    top: 64px;
    right: 0;
    bottom: 0;
    left: auto;
    width: min(86vw, 340px);
    z-index: 96;
    padding: 20px 18px calc(var(--bottom-bar) + 26px);
    background: var(--deep);
    border-left: 1px solid var(--line);
    box-shadow: -16px 0 44px rgba(0, 0, 0, 0.5);
    overflow-y: auto;
    transform: translateX(105%);
    transition: transform 0.32s cubic-bezier(0.4, 0, 0.2, 1);
  }
  .site-nav[data-open] { transform: translateX(0); }
  .nav-link { font-size: 17px; padding: 13px 10px; }

  .nav-mask { top: 64px; }

  .price-bar-title { display: none; }
  .price-tiers { justify-content: flex-start; }

  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-col--contact { grid-column: 1 / -1; }
}

@media (max-width: 760px) {
  .grid-2, .grid-3, .grid-ledger, .grid-ledger--flip { grid-template-columns: minmax(0, 1fr); }
  .offset-up { margin-top: 0; }
  .paper { box-shadow: 6px 6px 0 rgba(3, 14, 24, 0.62); }
  .footer-top { align-items: flex-start; }
  .footer-actions { width: 100%; }
  .footer-actions .btn { flex: 1 1 auto; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .breadcrumb { font-size: 12px; }
}

@media (max-width: 420px) {
  .axis-btn { padding: 5px 6px; font-size: 11px; }
  .nav-toggle-text { display: none; }
}

/* ============================================================
   动效
   ============================================================ */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
html.js [data-reveal="in"] { opacity: 1; transform: none; }

@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;
  }
  html.js [data-reveal] { opacity: 1; transform: none; }
  .site-nav { transition: none; }
}