/* ============================================================
   大发地址中心 · 共享样式表 /assets/site.css
   01 重置   02 变量   03 排版   04 工具类   05 头部
   06 移动抽屉  07 页脚  08 按钮标签  09 容器面包屑
   10 网格卡片  11 图片容器  12 动效降级
   ============================================================ */

/* ---------- 01 重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body, h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
button { font: inherit; color: inherit; background: none; border: 0; }
:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 02 变量 ---------- */
:root {
  --ink: #0E1734;
  --panel: #17224B;
  --line: #26325E;
  --cyan: #35E6D2;
  --teal: #1B8F86;
  --orange: #FF7A3D;
  --orange-deep: #C24E17;
  --mist: #E9EEF8;
  --muted: #93A0C0;
  --paper: #F6F8FF;
  --on-orange: #160800;

  --font-sans: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --t-fast: 180ms;
  --t-slow: 320ms;

  --wrap: 1240px;
  --gutter: clamp(18px, 4vw, 48px);
  --cut: 14px;
  --header-h: 76px;
}

/* ---------- 03 排版 ---------- */
body {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

@media (min-width: 900px) {
  body { font-size: 17px; }
}

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--paper);
}

h1 { font-size: clamp(34px, 5.4vw, 56px); }
h2 { font-size: clamp(22px, 2.8vw, 28px); }
h3 { font-size: clamp(18px, 1.9vw, 21px); letter-spacing: -0.01em; }
h4 { font-size: 16px; letter-spacing: 0; }

p { max-width: 44em; }

strong { font-weight: 700; color: var(--paper); }

code, .mono, time {
  font-family: var(--font-mono);
  font-size: 0.92em;
  letter-spacing: 0.02em;
}

::selection { background: var(--cyan); color: #04121B; }

/* ---------- 04 工具类 ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(56px, 8vw, 104px); }

.section-head { max-width: 62ch; margin-bottom: clamp(28px, 4vw, 48px); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before { content: ""; width: 22px; height: 1px; background: currentColor; }

.cut {
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.surface-light {
  --panel: #FFFFFF;
  --line: #C9D4EA;
  --paper: #0E1734;
  --muted: #4B5A85;
  --cyan: #1B8F86;
  --orange: #C24E17;
  --on-orange: #FFFFFF;
  background: var(--mist);
  color: #0E1734;
}

.surface-light ::selection { background: #1B8F86; color: #FFFFFF; }

/* ---------- 05 头部 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--cyan);
  color: #04121B;
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  border-radius: 2px;
  transform: translateY(-220%);
  transition: transform var(--t-fast) var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible { transform: translateY(0); outline-offset: 2px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(14, 23, 52, 0.94);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: #2F3D6E;
  background: rgba(11, 18, 42, 0.97);
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 32px);
  width: 100%;
  max-width: var(--wrap);
  min-height: var(--header-h);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  text-decoration: none;
  color: var(--paper);
}

.brand-mark {
  display: grid;
  gap: 3px;
  width: 22px;
  flex: 0 0 auto;
}
.brand-mark i {
  display: block;
  height: 4px;
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 0, calc(100% - 4px) 100%, 0 100%);
  transition: background var(--t-fast) var(--ease);
}
.brand-mark i:nth-child(2) { width: 76%; background: #B9C6E6; }
.brand-mark i:nth-child(3) { width: 52%; background: var(--orange); }

.brand-name {
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.brand:hover .brand-mark i:first-child { background: var(--orange); }

/* 主导航 */
.site-nav {
  display: block;
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(2px, 0.8vw, 8px);
}

.nav-link {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 8px 11px;
  text-decoration: none;
  color: var(--muted);
  border-radius: 2px;
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.nav-en {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
}

.nav-cn {
  font-size: 13px;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--paper);
  background: rgba(53, 230, 210, 0.08);
}

.nav-link:focus-visible { outline-offset: -2px; }

.nav-link[aria-current="page"] { color: var(--cyan); }
.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 1px;
  height: 2px;
  background: var(--cyan);
}

.nav-aside { display: none; }

/* 版本胶囊 */
.version-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 14px;
  background: var(--orange);
  color: var(--on-orange);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: transform var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.version-pill:hover { transform: translateY(-2px); background: #FF8F5C; }

.version-pill-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 3px rgba(22, 8, 0, 0.16);
}

.version-pill-en { opacity: 0.72; font-size: 10px; letter-spacing: 0.14em; }
.version-pill-text { font-size: 12px; }

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
  padding: 9px 13px;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--paper);
  cursor: pointer;
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: currentColor;
  transition: transform var(--t-fast) var(--ease);
}
.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-4px) rotate(-45deg); }

.nav-toggle-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.14em;
}

/* 阅读进度 */
.read-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}
.read-progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, #35E6D2 0%, #FF7A3D 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 90ms linear;
}

body.is-nav-open { overflow: hidden; }

/* ---------- 06 移动端抽屉 ---------- */
@media (max-width: 1080px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    inset: 0;
    z-index: 55;
    display: none;
    margin-left: 0;
    padding: calc(var(--header-h) + 26px) var(--gutter) 48px;
    overflow-y: auto;
    overscroll-behavior: contain;
    background-color: var(--ink);
    background-image: radial-gradient(circle at 1px 1px, rgba(147, 160, 192, 0.22) 1px, transparent 0);
    background-size: 24px 24px;
  }

  .site-nav[data-open] { display: block; animation: nav-in 240ms var(--ease) both; }

  .nav-list {
    display: grid;
    gap: 0;
    margin-top: 6px;
  }

  .nav-link {
    flex-direction: row;
    align-items: baseline;
    gap: 14px;
    padding: 16px 0;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
    color: var(--paper);
    background: none;
  }

  .nav-link:hover { background: none; color: var(--cyan); }

  .nav-link[aria-current="page"] { color: var(--cyan); }
  .nav-link[aria-current="page"]::after {
    left: 0;
    right: auto;
    bottom: 12px;
    width: 3px;
    height: 22px;
    background: var(--cyan);
  }

  .nav-en { width: 72px; flex: 0 0 auto; color: var(--cyan); font-size: 10.5px; }
  .nav-cn { font-size: 19px; font-weight: 700; }

  .nav-aside {
    display: block;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--line);
  }
  .nav-aside-label {
    font-family: var(--font-mono);
    font-size: 10.5px;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--cyan);
    margin-bottom: 10px;
  }
  .nav-aside-line {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.9;
    color: var(--muted);
    max-width: none;
  }
}

@keyframes nav-in {
  from { opacity: 0; transform: translateY(-12px); }
  to   { opacity: 1; transform: none; }
}

/* ---------- 07 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 120px);
  background: var(--ink);
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(147, 160, 192, 0.16) 1px, transparent 0);
  background-size: 24px 24px;
  pointer-events: none;
}

.footer-inner {
  position: relative;
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(44px, 6vw, 76px) var(--gutter) 26px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.25fr 1fr;
  gap: clamp(24px, 4vw, 56px);
}

.footer-col--brand { max-width: 30ch; }

.brand--footer { margin-bottom: 14px; }

.footer-note {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 30ch;
}
.footer-note--tight { margin-top: 14px; font-size: 12.5px; line-height: 1.7; max-width: 34ch; }

.footer-title {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-list li + li { margin-top: 9px; }

.footer-list a {
  display: inline-block;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}
.footer-list a:hover { color: var(--cyan); padding-left: 6px; }

.footer-list--contact li + li { margin-top: 14px; }

.footer-key {
  display: block;
  margin-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(147, 160, 192, 0.66);
}

.footer-val {
  display: block;
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.footer-links a { font-family: var(--font-mono); letter-spacing: 0.02em; }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 26px;
  margin-top: clamp(36px, 5vw, 58px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: rgba(147, 160, 192, 0.82);
}
.footer-copy, .footer-icp { max-width: none; }

/* ---------- 08 按钮与标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 2px;
  font-size: 14.5px;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--t-fast) var(--ease), background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.btn:hover { transform: translateY(-2px); }

.btn--primary { background: var(--orange); color: var(--on-orange); }
.btn--primary:hover { background: #FF8F5C; }

.btn--ghost {
  background: transparent;
  color: var(--paper);
  border: 1px solid var(--line);
}
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.btn--sm { padding: 8px 15px; font-size: 13px; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.tag--cyan { border-color: rgba(53, 230, 210, 0.5); color: var(--cyan); }
.tag--orange { border-color: rgba(255, 122, 61, 0.55); color: var(--orange); }

/* ---------- 09 面包屑 ---------- */
.breadcrumb { margin-bottom: 22px; }

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.breadcrumb-list li { display: inline-flex; align-items: center; gap: 8px; max-width: none; }
.breadcrumb-list li + li::before {
  content: "/";
  color: var(--line);
}
.breadcrumb-list a { color: var(--muted); text-decoration: none; transition: color var(--t-fast) var(--ease); }
.breadcrumb-list a:hover { color: var(--cyan); }
.breadcrumb-list [aria-current="page"] { color: var(--paper); }

/* ---------- 10 网格与卡片 ---------- */
.grid { display: grid; gap: clamp(14px, 2vw, 22px); }

.grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }

@media (min-width: 680px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.2vw, 26px);
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
  transition: transform var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(53, 230, 210, 0.5);
}

.card > a { text-decoration: none; }

.card-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
}

.card-title {
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.card-text {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
  max-width: none;
}

/* ---------- 11 图片容器 ---------- */
.figure {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.figure img,
.figure svg {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure--wide { aspect-ratio: 21 / 9; }
.figure--tall { aspect-ratio: 3 / 4; }

.figure--grid::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(147, 160, 192, 0.3) 1px, transparent 0);
  background-size: 24px 24px;
  pointer-events: none;
}

.figure figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  background: linear-gradient(to top, rgba(14, 23, 52, 0.9), transparent);
}

/* ---------- 12 动效与降级 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease);
}
[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-col--brand { max-width: none; }
}

@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .brand-name { font-size: 15px; }
  .version-pill { padding: 7px 11px; }
  .version-pill-en { display: 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;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .read-progress-bar { transition: none; }
}