/* =========================================================
   /assets/site.css — 必嬴网页 共享外壳与通用组件
   深墨绿基底 · 荧光青脉冲 · 暖琥珀时间戳 · 工程日志感
   ========================================================= */

:root {
  --c-bg: #061A14;
  --c-panel: #0B2A20;
  --c-line: #123B2D;
  --c-cyan: #33F2C0;
  --c-cyan-hi: #7CFFE2;
  --c-amber: #FFB35C;
  --c-paper: #F2FFF9;
  --c-text: #C4D9D1;
  --c-muted: #7E9E93;
  --c-alert: #FF7A6B;
  --c-void: #04120E;

  --shell-max: 1240px;
  --gutter: clamp(16px, 4vw, 44px);
  --bw: 2px;
  --shadow-hard: 5px 5px 0 rgba(2, 10, 8, 0.85);
  --shadow-lift: 9px 9px 0 rgba(51, 242, 192, 0.16);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);

  --font-display: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: "Noto Serif SC", "Songti SC", "Source Han Serif SC", "SimSun", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
}

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

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

body {
  margin: 0;
  min-height: 100%;
  color: var(--c-text);
  background-color: var(--c-bg);
  background-image:
    radial-gradient(1100px 560px at 8% -8%, rgba(51, 242, 192, 0.10), transparent 70%),
    radial-gradient(900px 520px at 104% 6%, rgba(255, 179, 92, 0.07), transparent 70%),
    repeating-linear-gradient(90deg, rgba(18, 59, 45, 0.55) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(0deg, rgba(18, 59, 45, 0.55) 0 1px, transparent 1px 88px);
  background-attachment: fixed;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
svg,
video { max-width: 100%; height: auto; }

button,
input,
select,
textarea { font: inherit; color: inherit; }

ul,
ol { margin: 0; padding: 0; }

a { color: var(--c-cyan-hi); }

[id] { scroll-margin-top: clamp(96px, 14vh, 150px); }

:focus-visible {
  outline: 2px solid var(--c-cyan-hi);
  outline-offset: 3px;
}

::selection {
  background: var(--c-cyan);
  color: var(--c-void);
}

/* ---------- 排版 ---------- */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.5em;
  color: var(--c-paper);
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(38px, 6vw, 80px); }
h2 { font-size: clamp(26px, 3.6vw, 42px); }

h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(20px, 2.4vw, 26px);
  letter-spacing: 0;
  line-height: 1.35;
}

h4 { font-size: clamp(17px, 1.8vw, 20px); letter-spacing: 0; }

p { margin: 0 0 1em; }

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

blockquote {
  margin: 0 0 1.2em;
  padding: 4px 0 4px 22px;
  border-left: 3px solid var(--c-cyan);
  font-family: var(--font-serif);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.6;
  color: var(--c-paper);
}

code, kbd, samp {
  font-family: var(--font-mono);
  font-size: 0.92em;
  color: var(--c-amber);
}

hr { border: 0; }

/* ---------- 布局容器 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(48px, 7vw, 104px); }
.section--tight { padding-block: clamp(30px, 4vw, 56px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 32px;
  margin-bottom: clamp(22px, 3vw, 40px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--c-cyan);
  flex: none;
}

.section-title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 4.2vw, 44px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

.lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.6vw, 18px);
  color: var(--c-text);
}

.divider {
  display: block;
  height: 2px;
  border: 0;
  margin: clamp(24px, 4vw, 44px) 0;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-line) 35%, transparent 92%);
}

/* ---------- 按钮 ---------- */
.btn {
  --btn-bg: transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border: var(--bw) solid var(--c-line);
  border-radius: 0;
  background: var(--btn-bg);
  color: var(--c-paper);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-decoration: none;
  line-height: 1.2;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease),
    background-color 0.2s var(--ease), transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.btn--primary {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  color: var(--c-void);
  box-shadow: 4px 4px 0 rgba(51, 242, 192, 0.22);
}

.btn--primary:hover {
  background: var(--c-cyan-hi);
  border-color: var(--c-cyan-hi);
  transform: translate(-1px, -1px);
  box-shadow: 6px 6px 0 rgba(51, 242, 192, 0.28);
}

.btn--ghost {
  background: transparent;
  color: var(--c-text);
  border-color: var(--c-line);
}

.btn--ghost:hover {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
  transform: translate(-1px, -1px);
}

/* ---------- 跳转与滚动进度 ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 300;
  padding: 12px 20px;
  background: var(--c-cyan);
  color: var(--c-void);
  border: 2px solid var(--c-void);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}

.skip-link:focus {
  left: 12px;
  top: 12px;
}

.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  width: 100%;
  z-index: 130;
  background: rgba(18, 59, 45, 0.55);
  pointer-events: none;
}

.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-amber));
  transition: width 0.1s linear;
}

/* ---------- 头部：第一层 状态条 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--c-bg);
  color: var(--c-text);
}

.status-strip {
  background: var(--c-void);
  border-bottom: 1px solid var(--c-line);
  max-height: 60px;
  overflow: hidden;
  transition: max-height 0.32s var(--ease), opacity 0.24s var(--ease);
}

.status-strip__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 7px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--c-muted);
}

.status-line {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  min-width: 0;
}

.status-dot {
  display: inline-block;
  flex: none;
  width: 8px;
  height: 8px;
  background: var(--c-cyan);
  animation: dotPulse 2.6s var(--ease) infinite;
}

@keyframes dotPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(51, 242, 192, 0.55); }
  70% { box-shadow: 0 0 0 8px rgba(51, 242, 192, 0); }
}

.status-line__text {
  color: var(--c-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.status-line__sep { color: var(--c-line); }

.status-line__ver {
  color: var(--c-cyan);
  font-weight: 700;
  letter-spacing: 0.14em;
  white-space: nowrap;
}

.status-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  white-space: nowrap;
}

.status-meta__key { color: var(--c-muted); }

.status-meta__val {
  color: var(--c-amber);
  letter-spacing: 0.12em;
}

/* ---------- 头部：第二层 名片行 ---------- */
.masthead {
  position: relative;
  z-index: 70;
  border-bottom: var(--bw) solid var(--c-line);
  background: linear-gradient(180deg, rgba(11, 42, 32, 0.97), rgba(6, 26, 20, 0.97));
}

.masthead__inner {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.4vw, 34px);
  padding-block: 14px;
  min-height: 82px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex: none;
  text-decoration: none;
  color: inherit;
}

.brand__mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  flex: none;
  background: var(--c-panel);
  border: var(--bw) solid var(--c-cyan);
  color: var(--c-cyan);
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow: 4px 4px 0 rgba(51, 242, 192, 0.24);
}

.brand__mark::after {
  content: "";
  position: absolute;
  inset: 4px;
  border: 1px solid rgba(51, 242, 192, 0.34);
  pointer-events: none;
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 21px;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--c-paper);
  white-space: nowrap;
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.13em;
  color: var(--c-muted);
  white-space: nowrap;
}

.main-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
  counter-reset: navidx;
}

.nav-list__item { display: block; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 9px 10px;
  color: var(--c-text);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 15px;
  line-height: 1.3;
  letter-spacing: 0.01em;
  text-decoration: none;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.nav-link::before {
  counter-increment: navidx;
  content: counter(navidx, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--c-muted);
  transition: color 0.2s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 2px;
  height: 2px;
  background: var(--c-cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.24s var(--ease);
}

.nav-link:hover { color: var(--c-cyan); }
.nav-link:hover::before { color: var(--c-amber); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-link[aria-current="page"] {
  color: var(--c-cyan);
  background: rgba(18, 59, 45, 0.85);
}

.nav-link[aria-current="page"]::before { color: var(--c-amber); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.masthead__tools {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  flex: none;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 10px 12px;
  background: transparent;
  border: var(--bw) solid var(--c-line);
  border-radius: 0;
  color: var(--c-text);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
  flex: none;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}

.site-header[data-open="true"] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header[data-open="true"] .nav-toggle__bars span:nth-child(2) {
  opacity: 0;
}

.site-header[data-open="true"] .nav-toggle__bars span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ---------- 头部：第三层 版本刻度带 ---------- */
.trace-bar {
  border-top: var(--bw) solid var(--c-line);
  background: rgba(4, 18, 14, 0.72);
  max-height: 60px;
  overflow: hidden;
  transition: max-height 0.32s var(--ease), opacity 0.24s var(--ease), border-width 0.24s var(--ease);
}

.trace-bar__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 24px);
  padding-block: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.trace-bar__label {
  color: var(--c-muted);
  letter-spacing: 0.2em;
  flex: none;
}

.trace-list {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.trace-list__item {
  position: relative;
  padding-left: 20px;
  color: var(--c-muted);
  letter-spacing: 0.16em;
}

.trace-list__item + .trace-list__item { margin-left: 16px; }

.trace-list__item + .trace-list__item::after {
  content: "";
  position: absolute;
  left: -16px;
  top: 50%;
  width: 16px;
  height: 1px;
  background: var(--c-line);
}

.trace-list__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 9px;
  height: 9px;
  margin-top: -4.5px;
  border: 2px solid currentColor;
  background: var(--c-void);
}

.trace-list__item.is-done { color: var(--c-line); }
.trace-list__item.is-done::before {
  background: var(--c-line);
  border-color: var(--c-line);
}

.trace-list__item.is-live {
  color: var(--c-cyan);
  font-weight: 700;
}

.trace-list__item.is-live::before {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  animation: dotPulse 2.6s var(--ease) infinite;
}

.trace-list__item.is-next::before {
  border-style: dashed;
  opacity: 0.65;
}

.trace-bar__note {
  margin-left: auto;
  color: rgba(255, 179, 92, 0.8);
  letter-spacing: 0.16em;
  white-space: nowrap;
}

.site-header.is-compact .status-strip,
.site-header.is-compact .trace-bar {
  max-height: 0;
  opacity: 0;
  border-width: 0;
  overflow: hidden;
}

/* ---------- 通用组件：面板 / 卡片 ---------- */
.panel {
  background: var(--c-panel);
  border: var(--bw) solid var(--c-line);
  box-shadow: var(--shadow-hard);
  padding: clamp(18px, 2.6vw, 32px);
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(16px, 2.2vw, 26px);
  background: var(--c-panel);
  border: var(--bw) solid var(--c-line);
  box-shadow: var(--shadow-hard);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.card:hover {
  transform: translate(-2px, -2px);
  border-color: var(--c-cyan);
  box-shadow: var(--shadow-lift);
}

.card__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2vw, 22px);
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.card__body {
  margin: 0;
  font-size: 15px;
  color: var(--c-text);
}

/* ---------- 标签与元信息 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--c-line);
  background: rgba(18, 59, 45, 0.5);
  color: var(--c-text);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1.4;
  white-space: nowrap;
}

.tag--cyan {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  color: var(--c-void);
  font-weight: 700;
}

.tag--amber {
  background: var(--c-amber);
  border-color: var(--c-amber);
  color: #1A0F02;
  font-weight: 700;
}

.tag--alert {
  background: transparent;
  border-color: var(--c-alert);
  color: var(--c-alert);
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-muted);
}

.meta-key { color: var(--c-muted); }
.meta-val { color: var(--c-paper); letter-spacing: 0.1em; }

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding-block: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-muted);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.breadcrumb a {
  color: var(--c-text);
  text-decoration: none;
  border-bottom: 1px solid var(--c-line);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.breadcrumb a:hover {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

.breadcrumb__sep {
  color: var(--c-muted);
  opacity: 0.8;
}

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

/* ---------- 正文长文 ---------- */
.prose {
  max-width: 70ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--c-text);
}

.prose h2,
.prose h3 {
  color: var(--c-paper);
  margin-top: 2.1em;
  margin-bottom: 0.6em;
}

.prose p { margin: 0 0 1.1em; }

.prose ul,
.prose ol {
  padding-left: 1.25em;
  margin: 0 0 1.2em;
}

.prose li { margin-bottom: 0.5em; }

.prose a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose blockquote { margin: 1.4em 0; }

.prose hr {
  height: 1px;
  margin: 2em 0;
  background: var(--c-line);
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  margin: 0 0 1.4em;
}

.prose th,
.prose td {
  border: 1px solid var(--c-line);
  padding: 9px 12px;
  text-align: left;
}

.prose th {
  background: var(--c-panel);
  color: var(--c-paper);
  font-weight: 700;
}

/* ---------- 栅格 ---------- */
.grid {
  display: grid;
  gap: clamp(14px, 2vw, 26px);
}

.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-6 { grid-column: span 6; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

/* ---------- 图片容器基础（页面阶段放图用） ---------- */
.figure {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
}

.figure__frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: var(--bw) solid var(--c-line);
  background-color: var(--c-panel);
  background-image:
    linear-gradient(135deg, rgba(51, 242, 192, 0.12), transparent 48%),
    repeating-linear-gradient(45deg, rgba(18, 59, 45, 0.95) 0 10px, rgba(11, 42, 32, 0.95) 10px 20px);
  box-shadow: var(--shadow-hard);
}

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

.figure__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure__tag {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 2;
  padding: 4px 10px;
  background: var(--c-amber);
  color: #1A0F02;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.figure__caption {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--c-muted);
}

.figure__caption::before {
  content: "FIG";
  flex: none;
  color: var(--c-amber);
  letter-spacing: 0.16em;
}

.figure-grid {
  display: grid;
  gap: clamp(14px, 2vw, 24px);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

/* ---------- 显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
  transition-delay: var(--d, 0s);
}

[data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: clamp(12px, 2vw, 28px);
  bottom: clamp(12px, 2vw, 28px);
  z-index: 110;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: rgba(4, 18, 14, 0.94);
  border: var(--bw) solid var(--c-cyan);
  border-radius: 0;
  color: var(--c-cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.24s var(--ease), transform 0.24s var(--ease),
    visibility 0.24s var(--ease), background-color 0.2s var(--ease), color 0.2s var(--ease);
}

.to-top__arrow {
  display: inline-block;
  font-size: 14px;
  line-height: 1;
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.to-top:hover {
  background: var(--c-cyan);
  color: var(--c-void);
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 110px);
  background: linear-gradient(180deg, rgba(11, 42, 32, 0.6), var(--c-void) 62%);
  border-top: 3px solid var(--c-line);
  color: var(--c-text);
}

.site-footer::before {
  content: "";
  display: block;
  height: 6px;
  background: repeating-linear-gradient(90deg, var(--c-cyan) 0 12px, transparent 12px 26px);
  opacity: 0.55;
}

.footer-main__inner {
  display: grid;
  grid-template-columns: minmax(230px, 1fr) minmax(0, 1.55fr) minmax(258px, 1.05fr);
  gap: clamp(24px, 4vw, 56px);
  padding-block: clamp(40px, 6vw, 76px);
}

.footer-brand { display: block; }

.footer-brand__mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  margin-bottom: 16px;
  background: var(--c-panel);
  border: var(--bw) solid var(--c-cyan);
  color: var(--c-cyan);
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  box-shadow: 5px 5px 0 rgba(51, 242, 192, 0.22);
}

.footer-brand__mark::after {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(51, 242, 192, 0.34);
  pointer-events: none;
}

.footer-brand__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 24px;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.footer-brand__line {
  margin: 0 0 20px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-muted);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 2.6vw, 34px);
  align-content: start;
}

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

.footer-col__title {
  margin: 0 0 14px;
  padding-top: 12px;
  border-top: var(--bw) solid var(--c-line);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-amber);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 2px;
  list-style: none;
}

.footer-link {
  display: inline-block;
  padding: 6px 0;
  color: var(--c-text);
  font-size: 14.5px;
  line-height: 1.5;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.footer-link:hover {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

.footer-link[aria-current="page"] {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

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

.footer-contact__title {
  margin: 0 0 14px;
  padding-top: 12px;
  border-top: var(--bw) solid var(--c-line);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  list-style: none;
  margin: 0 0 14px;
}

.contact-list__item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-bottom: 9px;
  border-bottom: 1px dashed rgba(18, 59, 45, 0.95);
}

.contact-list__key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.contact-list__val {
  color: var(--c-paper);
  font-size: 14.5px;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.footer-contact__note {
  margin: 0 0 18px;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--c-muted);
}

.footer-contact__cta { margin-top: 2px; }

.footer-bottom {
  border-top: 1px solid var(--c-line);
  background: var(--c-void);
}

.footer-bottom__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-block: 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--c-muted);
}

.footer-legal { margin: 0; color: var(--c-muted); }

.footer-legal__icp { color: rgba(196, 217, 209, 0.8); }

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
}

.footer-meta__k { color: rgba(255, 179, 92, 0.75); }

.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  list-style: none;
}

.footer-legal-links .footer-link {
  font-family: var(--font-mono);
  font-size: 11.5px;
  padding: 4px 0;
  letter-spacing: 0.08em;
}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 1180px) {
  .nav-link { font-size: 14px; padding-inline: 8px; }
  .nav-link::after { left: 8px; right: 8px; }
  .brand__mark { width: 52px; height: 52px; font-size: 18px; }
  .brand__name { font-size: 19px; }
}

@media (max-width: 1040px) {
  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex: none;
    justify-content: flex-start;
    background: var(--c-panel);
    border-top: var(--bw) solid var(--c-line);
    border-bottom: var(--bw) solid var(--c-cyan);
    box-shadow: 0 24px 44px rgba(2, 10, 8, 0.65);
    padding: 10px var(--gutter) 22px;
    max-height: calc(100vh - 92px);
    overflow-y: auto;
  }

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

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

  .nav-list__item { border-bottom: 1px dashed rgba(18, 59, 45, 0.95); }
  .nav-list__item:last-child { border-bottom: 0; }

  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 14px 4px;
    font-size: 16px;
  }

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

  .nav-link[aria-current="page"] {
    background: rgba(18, 59, 45, 0.6);
    padding-left: 10px;
  }

  .nav-toggle { display: inline-flex; }
  .masthead__tools .btn--ghost { display: none; }
  .brand__sub { display: none; }

  .footer-main__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
  }

  .footer-contact { grid-column: 1 / -1; }

  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-3, .col-4 { grid-column: span 3; }
  .col-6, .col-8, .col-9, .col-12 { grid-column: span 6; }
}

@media (max-width: 760px) {
  body { font-size: 15.5px; background-attachment: scroll; }

  .trace-bar__note { display: none; }

  .masthead__inner {
    min-height: 70px;
    padding-block: 11px;
    gap: 12px;
  }

  .brand__mark { width: 46px; height: 46px; font-size: 16px; box-shadow: 3px 3px 0 rgba(51, 242, 192, 0.22); }
  .brand__name { font-size: 17px; }

  .btn { padding: 10px 14px; font-size: 12px; }

  .footer-main__inner { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: 1fr 1fr; }
  .footer-contact { grid-column: auto; }

  .footer-bottom__inner { justify-content: flex-start; }

  .prose { font-size: 16px; line-height: 1.8; }
}

@media (max-width: 640px) {
  .status-line__text { display: none; }
  .status-meta__key { display: none; }
  .status-strip__inner { padding-block: 6px; }

  .trace-bar__inner { padding-block: 7px; font-size: 10px; letter-spacing: 0.1em; }
  .trace-list__item { padding-left: 16px; }
  .trace-list__item + .trace-list__item { margin-left: 12px; }
  .trace-list__item + .trace-list__item::after { left: -12px; width: 12px; }

  .grid--12 { grid-template-columns: 1fr; }
  .col-3, .col-4, .col-6, .col-8, .col-9, .col-12 { grid-column: 1 / -1; }
}

@media (max-width: 560px) {
  .masthead__tools .btn--primary { display: none; }
  .footer-cols { grid-template-columns: 1fr; }
  .figure-grid { grid-template-columns: 1fr; }
  .to-top { padding: 9px 12px; font-size: 11px; }
}

@media (max-width: 380px) {
  .brand__name { font-size: 16px; }
  .trace-bar__label { display: none; }
}

/* =========================================================
   动效偏好
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .scroll-progress__bar { transition: none; }
}