/* =========================================================
   /assets/site.css — 竞博网页 共享外壳与基础组件
   北极夜航 · 极简文字建筑 · 珠宝色分区
   ========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1.25rem);
}

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

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

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

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

a { color: inherit; }

::selection {
  background: var(--amber);
  color: #0A1620;
}

/* 2. 设计变量 -------------------------------------------- */
:root {
  --abyss: #041826;
  --teal-deep: #0B3B44;
  --indigo: #26245C;
  --wine: #5B1F35;
  --ice: #79E6DD;
  --amber: #F2AE5B;
  --silver: #C8D4E0;
  --frost: #F4F8FC;
  --aurora-a: #8B79FF;
  --aurora-b: #3A2F8F;

  --ink-muted: #A6B8C7;
  --line: rgba(200, 212, 224, 0.16);
  --line-strong: rgba(200, 212, 224, 0.34);

  --font-head: "Sora", "HarmonyOS Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "HarmonyOS Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;

  --wrap: 1200px;
  --gutter: clamp(1.15rem, 4vw, 3.25rem);
  --header-h: 78px;
  --radius: 2px;
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

/* 3. 中文排版与基础 -------------------------------------- */
body {
  background-color: var(--abyss);
  color: var(--frost);
  font-family: var(--font-body);
  font-size: clamp(1rem, 0.35vw + 0.92rem, 1.125rem);
  font-weight: 400;
  line-height: 1.75;
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--frost);
  text-wrap: balance;
}

h1 { font-size: clamp(2.4rem, 7vw, 6.2rem); line-height: 1.02; }
h2 { font-size: clamp(1.7rem, 3.6vw, 2.7rem); }
h3 { font-size: clamp(1.18rem, 1.8vw, 1.5rem); font-weight: 700; letter-spacing: -0.01em; line-height: 1.28; }
h4 { font-size: 1.02rem; font-weight: 700; letter-spacing: 0; line-height: 1.4; }

p { margin: 0; }

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

a { text-decoration: none; }

:focus-visible {
  outline: 2px solid var(--ice);
  outline-offset: 3px;
  border-radius: 1px;
}

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

.muted { color: var(--ink-muted); }

/* 4. 布局原语 -------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: clamp(2.6rem, 6vw, 5rem);
}

.section--teal { background-color: var(--teal-deep); }
.section--indigo { background-color: var(--indigo); }
.section--wine { background-color: var(--wine); }

.section--glass {
  background-color: rgba(121, 230, 221, 0.05);
  border-block: 1px solid var(--line);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(1.4rem, 4vw, 3.4rem);
  align-items: start;
}

.grid {
  display: grid;
  gap: clamp(1.1rem, 2.4vw, 2rem);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.prose {
  max-width: 40ch;
}

.prose p {
  margin-block: 0 1.05em;
  color: #DCE7F1;
}

.prose h2 { margin-block: 2.2em 0.7em; }
.prose h3 { margin-block: 1.7em 0.5em; }

.prose ul,
.prose ol {
  margin-block: 0 1.05em;
  padding-inline-start: 1.3em;
  list-style: disc;
  color: #DCE7F1;
}

.prose ol { list-style: decimal; }

.prose li { margin-block-end: 0.4em; }

.panel {
  position: relative;
  background-color: rgba(11, 59, 68, 0.55);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1.1rem, 2.4vw, 1.75rem);
}

.panel--plain {
  background-color: transparent;
}

.panel--glass {
  background-color: rgba(244, 248, 252, 0.05);
  border-color: rgba(244, 248, 252, 0.16);
  backdrop-filter: blur(10px) saturate(120%);
  -webkit-backdrop-filter: blur(10px) saturate(120%);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ice);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: linear-gradient(90deg, var(--ice), var(--amber));
}

.index-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ice);
  background-color: rgba(121, 230, 221, 0.07);
  border: 1px solid rgba(121, 230, 221, 0.4);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
}

.tag--amber {
  color: var(--amber);
  border-color: rgba(242, 174, 91, 0.45);
  background-color: rgba(242, 174, 91, 0.09);
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--ink-muted);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb a {
  color: var(--silver);
  transition: color 0.2s var(--ease);
}

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

.breadcrumb li + li::before {
  content: "/";
  margin-inline-end: 0.5rem;
  color: rgba(200, 212, 224, 0.4);
}

.breadcrumb [aria-current="page"] { color: var(--ice); }

/* 5. 跳转链接 -------------------------------------------- */
.skip-link {
  position: fixed;
  top: 0.6rem;
  left: 0.6rem;
  z-index: 400;
  transform: translateY(-200%);
  padding: 0.7rem 1.15rem;
  background-color: var(--amber);
  color: #0A1620;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  border-radius: var(--radius);
  transition: transform 0.22s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline-offset: 2px;
}

/* 6. 头部 ------------------------------------------------ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  isolation: isolate;
  border-block-end: 1px solid transparent;
  transition: background-color 0.3s var(--ease), border-color 0.3s var(--ease);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg,
    rgba(4, 24, 38, 0.94) 0%,
    rgba(4, 24, 38, 0.62) 62%,
    rgba(4, 24, 38, 0) 100%);
  transition: opacity 0.3s var(--ease);
}

.site-header::after {
  content: "";
  position: absolute;
  inset-block-start: 0;
  inset-inline: 0;
  height: 2px;
  pointer-events: none;
  background: linear-gradient(90deg,
    rgba(121, 230, 221, 0) 0%,
    rgba(121, 230, 221, 0.85) 14%,
    rgba(139, 121, 255, 0.8) 48%,
    rgba(242, 174, 91, 0.9) 80%,
    rgba(242, 174, 91, 0) 100%);
}

.site-header.is-scrolled {
  background-color: rgba(4, 24, 38, 0.97);
  border-block-end-color: var(--line);
  backdrop-filter: blur(16px) saturate(130%);
  -webkit-backdrop-filter: blur(16px) saturate(130%);
}

.site-header.is-scrolled::before { opacity: 0; }

.site-header[data-open="true"] {
  background-color: rgba(4, 24, 38, 0.99);
  border-block-end-color: var(--line);
}

.site-header[data-open="true"]::before { opacity: 0; }

.header-inner {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: clamp(0.8rem, 2vw, 2rem);
  width: 100%;
  max-width: var(--wrap);
  min-height: var(--header-h);
  margin-inline: auto;
  padding-block: 0.6rem;
  padding-inline: var(--gutter);
}

.header-progress {
  position: absolute;
  inset-block-end: -1px;
  inset-inline-start: 0;
  z-index: 3;
  display: block;
  width: 0;
  height: 2px;
  pointer-events: none;
  background: linear-gradient(90deg, var(--ice), var(--amber));
  transition: width 0.12s linear;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex: 0 0 auto;
  color: var(--frost);
  text-decoration: none;
}

.brand-mark {
  display: block;
  flex: 0 0 auto;
  width: 24px;
  height: 24px;
  border: 1.5px solid var(--ice);
  transform: rotate(45deg);
  position: relative;
  transition: border-color 0.25s var(--ease);
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 5px;
  background: linear-gradient(135deg, var(--ice), var(--aurora-a));
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.brand-name {
  display: block;
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.15;
  color: var(--frost);
}

.brand-sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  line-height: 1.3;
  color: var(--ice);
}

.brand:hover .brand-mark { border-color: var(--amber); }

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(0.6rem, 2vw, 1.6rem);
  margin-inline-start: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(0.2rem, 1.3vw, 1.1rem);
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 0.55rem 0.3rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--silver);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0.3rem;
  right: 0.3rem;
  bottom: 0.15rem;
  height: 1px;
  background-color: var(--ice);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.25s var(--ease), background-color 0.25s var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible { color: var(--frost); }

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

.nav-link[aria-current="page"] { color: var(--ice); }

.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  background: linear-gradient(90deg, var(--ice), var(--amber));
}

.nav-foot {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-inline-start: 0.35rem;
}

.nav-note {
  display: none;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
}

/* 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-width: 52px;
  min-height: 52px;
  padding: 0 0.85rem;
  margin-inline-start: auto;
  color: var(--frost);
  background-color: rgba(121, 230, 221, 0.08);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  cursor: pointer;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.nav-toggle:hover {
  border-color: rgba(121, 230, 221, 0.6);
  background-color: rgba(121, 230, 221, 0.14);
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
}

.nav-toggle-bars span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background-color: currentColor;
  transition: transform 0.24s var(--ease);
}

.nav-toggle-bars span:nth-child(1) { top: 0; }
.nav-toggle-bars span:nth-child(2) { bottom: 0; }

.site-header[data-open="true"] .nav-toggle-bars span:nth-child(1) {
  transform: translateY(5.25px) rotate(45deg);
}

.site-header[data-open="true"] .nav-toggle-bars span:nth-child(2) {
  transform: translateY(-5.25px) rotate(-45deg);
}

.nav-toggle-label { display: inline-block; }

/* 7. 按钮 ------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.6rem 1.2rem;
  font-family: var(--font-head);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  color: #0A1620;
  background-color: var(--amber);
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform 0.18s var(--ease), background-color 0.18s var(--ease),
              color 0.18s var(--ease), box-shadow 0.18s var(--ease),
              border-color 0.18s var(--ease);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 26px -14px rgba(242, 174, 91, 0.9);
}

.btn:active { transform: translateY(0); box-shadow: none; }

.btn--sm {
  min-height: 40px;
  padding: 0.42rem 0.9rem;
  font-size: 0.82rem;
}

.btn--ghost {
  color: var(--ice);
  background-color: transparent;
  border-color: rgba(121, 230, 221, 0.45);
}

.btn--ghost:hover {
  background-color: rgba(121, 230, 221, 0.1);
  box-shadow: none;
}

.btn--block { width: 100%; }

/* 8. 页脚 ------------------------------------------------ */
.site-footer {
  position: relative;
  margin-block-start: clamp(3rem, 7vw, 6rem);
  color: var(--silver);
  background-image: linear-gradient(180deg, #041826 0%, #0A2B3A 52%, #0B3B44 100%);
  border-block-start: 1px solid var(--line);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset-block-start: 0;
  inset-inline: 0;
  height: 1px;
  background: linear-gradient(90deg,
    rgba(139, 121, 255, 0) 0%,
    rgba(139, 121, 255, 0.9) 32%,
    rgba(121, 230, 221, 0.9) 62%,
    rgba(242, 174, 91, 0) 100%);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1.15fr);
  gap: clamp(1.8rem, 4vw, 3.5rem);
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-block: clamp(2.6rem, 6vw, 4.5rem);
  padding-inline: var(--gutter);
}

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

.brand--footer { margin-block-end: 1.1rem; }

.footer-summary {
  max-width: 32ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--silver);
}

.footer-flag {
  margin-block-start: 1rem;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(200, 212, 224, 0.62);
}

.footer-heading {
  margin-block-end: 1rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ice);
}

.footer-nav { min-width: 0; }
.footer-contact { min-width: 0; }

.footer-list {
  display: grid;
  gap: 0.55rem;
}

.footer-list a {
  display: inline-block;
  font-size: 0.92rem;
  color: var(--frost);
  border-block-end: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.footer-list a:hover {
  color: var(--ice);
  border-block-end-color: var(--ice);
}

.footer-list--copy { gap: 0.5rem; }

.copy-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  width: 100%;
  padding: 0.6rem 0.8rem;
  text-align: left;
  color: var(--frost);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  background-color: rgba(121, 230, 221, 0.05);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease),
              color 0.2s var(--ease);
}

.copy-line:hover {
  border-color: rgba(121, 230, 221, 0.55);
  background-color: rgba(121, 230, 221, 0.1);
}

.copy-line[data-copied="true"] {
  color: var(--amber);
  border-color: rgba(242, 174, 91, 0.7);
  background-color: rgba(242, 174, 91, 0.1);
}

.copy-value {
  min-width: 0;
  overflow-wrap: anywhere;
}

.copy-hint {
  flex: 0 0 auto;
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  color: var(--ice);
}

.copy-line[data-copied="true"] .copy-hint { color: var(--amber); }

.footer-note {
  margin-block-start: 1rem;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--ink-muted);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem 1.6rem;
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 1.1rem var(--gutter) 1.6rem;
  border-block-start: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: rgba(200, 212, 224, 0.66);
}

.footer-copy { margin: 0; }

.footer-utility {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.2rem;
}

.footer-utility a {
  color: var(--silver);
  transition: color 0.2s var(--ease);
}

.footer-utility a:hover { color: var(--ice); }

/* 9. 图片容器基础 ---------------------------------------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-image: linear-gradient(140deg, #0B3B44 0%, #26245C 62%, #041826 100%);
}

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

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-fallback {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1rem;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(200, 212, 224, 0.55);
}

/* 10. 响应式 -------------------------------------------- */
@media (max-width: 1023px) {
  .nav-link { font-size: 0.86rem; }
  .nav-list { gap: 0.2rem; }
}

@media (max-width: 899px) {
  :root { --header-h: 64px; }

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

  .site-nav {
    position: fixed;
    inset-block-start: var(--header-h);
    inset-inline: 0;
    z-index: 110;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: calc(100dvh - var(--header-h));
    margin: 0;
    padding: 1rem var(--gutter) 1.75rem;
    overflow-y: auto;
    background-image: linear-gradient(180deg, #072433 0%, #041826 100%);
    border-block-start: 1px solid var(--line);
    box-shadow: 0 24px 48px -24px rgba(0, 0, 0, 0.8);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-14px);
    transition: opacity 0.24s var(--ease), transform 0.24s var(--ease),
                visibility 0.24s var(--ease);
  }

  .site-header[data-open="true"] .site-nav {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }

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

  .nav-link {
    display: block;
    padding: 0.95rem 0.3rem;
    font-size: 1rem;
    border-block-end: 1px solid var(--line);
  }

  .nav-link::after { display: none; }

  .nav-link[aria-current="page"] {
    border-inline-start: 2px solid var(--ice);
    padding-inline-start: 0.85rem;
    background-color: rgba(121, 230, 221, 0.06);
  }

  .nav-foot {
    flex-direction: column;
    align-items: stretch;
    gap: 0.7rem;
    margin-block-start: 1.1rem;
    margin-inline-start: 0;
  }

  .nav-note { display: block; }

  .btn { min-height: 52px; }

  .split,
  .grid--2,
  .grid--3 {
    grid-template-columns: minmax(0, 1fr);
  }

  .prose { max-width: none; }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 2rem;
  }

  .footer-summary { max-width: none; }

  .footer-base {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.8rem;
  }

  .header-inner { gap: 0.7rem; }
  .brand-name { font-size: 0.98rem; }
  .brand-sub { font-size: 0.58rem; letter-spacing: 0.14em; }
}

@media (max-width: 420px) {
  .nav-toggle { padding: 0 0.6rem; letter-spacing: 0.1em; }
  .brand-mark { width: 20px; height: 20px; }
  .brand-mark::after { inset: 4px; }
}

/* 11. 动效偏好 ------------------------------------------ */
@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;
  }
}