/* ==========================================================================
   626登录口 — 共享站点样式 /assets/site.css
   深空蓝坐标网格 + 奶油纸面印刷模块 + 霓虹青索引线
   ========================================================================== */

:root {
  --deep: #061A2E;
  --midnight: #0D2A46;
  --neon: #1FD9D0;
  --hilight: #B8FFF9;
  --amber: #FFA13A;
  --ember: #E75A3C;
  --cream: #F5EBDD;
  --paper-2: #E7D7C2;
  --ink: #241B17;
  --mist: #8FA6B8;

  --font-display: "Noto Sans SC", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "DIN Alternate", ui-monospace, SFMono-Regular, Consolas, monospace;

  --shell: 1360px;
  --edge: clamp(16px, 3.2vw, 40px);
  --rail-w: 88px;

  --radius-s: 4px;
  --radius-m: 10px;
  --shadow-paper: 0 1px 0 var(--paper-2), 0 14px 26px -20px rgba(36, 27, 23, 0.75);

  --t-fast: 180ms;
  --t-mid: 240ms;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

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

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

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

::selection {
  background: var(--amber);
  color: var(--ink);
}

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

/* ---------- 中文排版基底 ---------- */
body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  color: var(--ink);
  background-color: var(--cream);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--ink);
}

p { text-wrap: pretty; }

.mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ember);
}

.display {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.6rem, 6.2vw, 5.1rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
}

.on-dark { color: rgba(184, 255, 249, 0.84); }
.on-dark h1,
.on-dark h2,
.on-dark h3,
.on-dark h4 { color: #FFFFFF; }

/* ---------- 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding-left: var(--edge);
  padding-right: var(--edge);
}

.container-narrow {
  width: 100%;
  max-width: 820px;
  margin: 0 auto;
  padding-left: var(--edge);
  padding-right: var(--edge);
}

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: rgba(36, 27, 23, 0.16);
}

.rule--neon { background: rgba(31, 217, 208, 0.38); }

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 11px 18px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  background: var(--amber);
  border: 1px solid var(--ink);
  border-radius: var(--radius-s);
  transform: translateY(-180%);
  transition: transform var(--t-fast) ease;
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 20px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: var(--radius-s);
  transition: transform var(--t-fast) ease, background-color var(--t-fast) ease,
              color var(--t-fast) ease, border-color var(--t-fast) ease;
}

.btn-amber {
  color: var(--ink);
  background: var(--amber);
  border-color: var(--amber);
}

.btn-amber:hover {
  background: #FFB45C;
  transform: translateY(-1px);
}

.btn-ghost {
  color: var(--hilight);
  background: transparent;
  border-color: rgba(31, 217, 208, 0.6);
}

.btn-ghost:hover {
  background: rgba(31, 217, 208, 0.12);
  border-color: var(--neon);
}

.btn-ink {
  color: var(--cream);
  background: var(--ink);
  border-color: var(--ink);
}

.btn-ink:hover {
  background: var(--midnight);
  border-color: var(--midnight);
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--paper-2);
  border: 1px solid var(--ink);
  border-radius: 2px;
}

.tag--neon {
  color: var(--hilight);
  background: rgba(31, 217, 208, 0.12);
  border-color: rgba(31, 217, 208, 0.55);
}

.tag--amber {
  color: var(--ink);
  background: var(--amber);
  border-color: var(--ink);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  padding: 20px 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.breadcrumb a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--neon);
  text-underline-offset: 4px;
  transition: color var(--t-fast) ease;
}

.breadcrumb a:hover { color: var(--neon); }

.breadcrumb [aria-current="page"] {
  color: var(--ember);
  text-decoration: none;
}

/* ---------- 图片容器基础规则 ---------- */
.fig {
  position: relative;
  display: block;
  margin: 0;
  overflow: hidden;
  background: var(--paper-2);
  border: 1px solid var(--ink);
  border-radius: var(--radius-s);
  box-shadow: var(--shadow-paper);
}

.fig-media {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  background-color: var(--paper-2);
  background-image:
    repeating-linear-gradient(135deg, rgba(6, 26, 46, 0.14) 0 8px, rgba(6, 26, 46, 0) 8px 16px),
    radial-gradient(120% 90% at 12% 0%, rgba(31, 217, 208, 0.24), transparent 62%);
}

.fig > img,
.fig > picture > img,
.fig-media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.fig::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(118deg, rgba(31, 217, 208, 0.14), transparent 58%);
}

.fig--wide .fig-media { aspect-ratio: 21 / 9; }
.fig--tall .fig-media { aspect-ratio: 3 / 4; }
.fig--square .fig-media { aspect-ratio: 1 / 1; }

.fig-cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
}

.on-dark .fig { border-color: rgba(31, 217, 208, 0.42); }
.on-dark .fig-cap { color: rgba(184, 255, 249, 0.6); }

/* ==========================================================================
   页头
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  color: var(--hilight);
  background-color: var(--deep);
  background-image:
    linear-gradient(rgba(31, 217, 208, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 217, 208, 0.06) 1px, transparent 1px);
  background-size: 64px 64px, 64px 64px;
  border-bottom: 1px solid rgba(31, 217, 208, 0.3);
}

.scroll-meter {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--neon), var(--amber));
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

.header-inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 26px);
  width: 100%;
  max-width: var(--shell);
  min-height: 78px;
  margin: 0 auto;
  padding: 0 var(--edge);
}

/* 左侧品牌块 */
.brand-block {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 0 0 auto;
  padding-right: 18px;
  border-right: 1px solid rgba(31, 217, 208, 0.25);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 5px;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand-mark {
  font-size: 23px;
  line-height: 1;
  color: var(--amber);
}

.brand-name {
  font-size: 16px;
  line-height: 1;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--hilight);
}

.brand-meta {
  display: flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 3px rgba(31, 217, 208, 0.16);
}

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--hilight);
  border: 1px solid rgba(31, 217, 208, 0.4);
  border-radius: var(--radius-s);
  transition: border-color var(--t-fast) ease, background-color var(--t-fast) ease;
}

.nav-toggle:hover { border-color: var(--neon); }

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

.nav-toggle-bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--neon);
  transition: transform var(--t-fast) ease, opacity var(--t-fast) ease;
}

.site-header[data-open="true"] .nav-toggle-bars span:first-child {
  transform: translateY(3px) rotate(45deg);
}

.site-header[data-open="true"] .nav-toggle-bars span:last-child {
  transform: translateY(-3px) rotate(-45deg);
}

.nav-toggle-label { letter-spacing: 0.06em; }

/* 右侧栏目区 */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.5vw, 22px);
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(4px, 0.9vw, 16px);
  counter-reset: navcount;
}

.nav-list li a {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 10px 3px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(184, 255, 249, 0.76);
  transition: color var(--t-fast) ease;
}

.nav-list li a::before {
  counter-increment: navcount;
  content: "0" counter(navcount);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  color: var(--mist);
  opacity: 0.9;
}

.nav-list li a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 2px;
  background: var(--neon);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-mid) ease;
}

.nav-list li a:hover,
.nav-list li a:focus-visible { color: #FFFFFF; }

.nav-list li a:hover::after,
.nav-list li a:focus-visible::after { transform: scaleX(1); }

.nav-list li a[aria-current="page"] { color: var(--amber); font-weight: 700; }

.nav-list li a[aria-current="page"]::before { color: var(--amber); }

.nav-list li a[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--amber);
}

/* 版本切换胶囊 */
.nav-version {
  display: inline-flex;
  padding: 3px;
  background: rgba(31, 217, 208, 0.07);
  border: 1px solid rgba(31, 217, 208, 0.34);
  border-radius: 999px;
}

.version-link {
  padding: 6px 13px;
  font-size: 12.5px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--mist);
  border-radius: 999px;
  transition: color var(--t-fast) ease, background-color var(--t-fast) ease;
}

.version-link:not(.is-current):hover { color: var(--hilight); }

.version-link.is-current {
  color: var(--deep);
  background: var(--neon);
  font-weight: 700;
}

.nav-cta {
  padding: 11px 16px;
  font-size: 13.5px;
  letter-spacing: 0.02em;
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  margin-top: clamp(48px, 7vw, 96px);
  color: rgba(184, 255, 249, 0.8);
  background-color: var(--midnight);
  background-image:
    linear-gradient(rgba(31, 217, 208, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 217, 208, 0.05) 1px, transparent 1px);
  background-size: 72px 72px, 72px 72px;
  border-top: 1px solid rgba(31, 217, 208, 0.32);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.35fr 1fr;
  gap: clamp(24px, 3.2vw, 52px);
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(40px, 5vw, 66px) var(--edge) clamp(28px, 3.4vw, 44px);
}

.footer-brand { min-width: 0; }

.footer-logo {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.footer-logo-mark {
  font-size: 30px;
  line-height: 1;
  color: var(--amber);
}

.footer-logo-word {
  font-size: 18px;
  line-height: 1;
  color: #FFFFFF;
}

.footer-tag {
  margin-top: 14px;
  max-width: 24ch;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(184, 255, 249, 0.62);
}

.footer-quick {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-top: 20px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
}

.footer-quick li + li::before {
  content: "/";
  margin-right: 14px;
  color: rgba(143, 166, 184, 0.6);
}

.footer-quick a {
  color: var(--neon);
  border-bottom: 1px solid rgba(31, 217, 208, 0.45);
  padding-bottom: 2px;
  transition: color var(--t-fast) ease, border-color var(--t-fast) ease;
}

.footer-quick a:hover {
  color: var(--amber);
  border-color: var(--amber);
}

.footer-col { min-width: 0; }

.footer-heading {
  padding-top: 12px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--neon);
  border-top: 1px solid rgba(31, 217, 208, 0.34);
}

.footer-list {
  display: grid;
  gap: 9px;
  font-size: 14px;
}

.footer-list a {
  color: rgba(184, 255, 249, 0.82);
  transition: color var(--t-fast) ease;
}

.footer-list a:hover,
.footer-list a:focus-visible { color: var(--amber); }

.contact-list {
  display: grid;
  gap: 11px;
  font-size: 13.5px;
}

.contact-row {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 10px;
  align-items: baseline;
}

.contact-row dt {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.contact-row dd {
  margin: 0;
  line-height: 1.6;
  color: rgba(184, 255, 249, 0.9);
  overflow-wrap: anywhere;
}

.footer-icp {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 16px var(--edge);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
  border-top: 1px solid rgba(143, 166, 184, 0.22);
}

.footer-copy { margin: 0; }
.footer-note { margin: 0; color: rgba(143, 166, 184, 0.82); }

/* ==========================================================================
   滚动显现协议
   ========================================================================== */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 480ms ease, transform 480ms ease;
}

html.js [data-reveal].is-in {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1240px) {
  .nav-version { display: none; }
}

@media (max-width: 1080px) {
  .brand-meta { display: none; }
  .brand-block { padding-right: 14px; }
  .nav-list li a { font-size: 13.5px; }
}

@media (max-width: 960px) {
  html { scroll-padding-top: 80px; }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    padding: 10px var(--edge) 26px;
    background-color: var(--deep);
    border-bottom: 1px solid rgba(31, 217, 208, 0.38);
    box-shadow: 0 26px 44px -30px #000000;
    max-height: calc(100vh - 78px);
    overflow-y: auto;
  }

  .site-header[data-open="true"] .site-nav { display: flex; }

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

  .nav-list li a {
    justify-content: flex-start;
    padding: 15px 2px;
    font-size: 16px;
    border-bottom: 1px solid rgba(143, 166, 184, 0.18);
  }

  .nav-list li a::after { display: none; }

  .nav-list li a[aria-current="page"] {
    border-bottom-color: rgba(255, 161, 58, 0.55);
  }

  .nav-version {
    display: flex;
    margin-top: 18px;
    align-self: flex-start;
  }

  .nav-version .version-link { padding: 8px 18px; }

  .nav-cta {
    margin-top: 16px;
    width: 100%;
    padding: 15px 20px;
    font-size: 15px;
  }

  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-base { justify-content: flex-start; }
}

@media (max-width: 620px) {
  body { font-size: 16px; }

  .header-inner { min-height: 70px; }
  .brand-mark { font-size: 21px; }
  .brand-name { font-size: 15px; }
  .nav-toggle { padding: 9px 12px; }
  .site-nav { max-height: calc(100vh - 70px); }

  .footer-inner { grid-template-columns: 1fr; }
  .contact-row { grid-template-columns: 64px 1fr; }
  .footer-quick li + li::before { margin-right: 10px; }
  .footer-quick { gap: 8px 10px; }

  .fig--wide .fig-media { aspect-ratio: 16 / 9; }
}

@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;
  }

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