/* ==========================================================================
   鼎博登陆 · 共享外壳样式表 /assets/site.css
   夜墨底 + 控制台层 + 琥珀金 / 电光青 / 暖橙 的夜间控制面板体系
   ========================================================================== */

:root {
  --db-ink: #070E1C;
  --db-console: #0C1730;
  --db-panel: #14264A;
  --db-teal: #0B3A44;
  --db-indigo: #2C2450;
  --db-wine: #4A2130;
  --db-gold: #E9B44C;
  --db-cyan: #3FD8CE;
  --db-orange: #FF8A3D;
  --db-text: #EEF3FA;
  --db-muted: #A9B8CE;
  --db-line: #22304A;
  --db-radius: 2px;
  --db-max: 1240px;
  --db-pad: clamp(16px, 4vw, 40px);
  --db-font-head: "HarmonyOS Sans SC", "MiSans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --db-font-body: "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --db-font-mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono", "Roboto Mono", Menlo, Consolas, "Courier New", monospace;
  --db-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --db-header-h: 70px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--db-header-h) + 16px);
}

body {
  margin: 0;
  background: var(--db-ink);
  color: var(--db-text);
  font-family: var(--db-font-body);
  font-size: 17px;
  line-height: 1.75;
  font-weight: 400;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.6em;
  font-family: var(--db-font-head);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.24;
  color: var(--db-text);
}

h1 { font-size: 44px; }
h2 { font-size: 30px; }
h3 { font-size: 21px; }

p { margin: 0 0 1.1em; }
p:last-child { margin-bottom: 0; }

a { color: var(--db-cyan); text-decoration: none; }
a:hover { color: var(--db-gold); }

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

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

button { font: inherit; }

table { border-collapse: collapse; width: 100%; }

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

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

/* ---------- 工具类 ---------- */
.db-mono {
  font-family: var(--db-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.9em;
  letter-spacing: 0.02em;
}

.db-sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.db-rule {
  border: 0;
  height: 1px;
  margin: 0;
  background: linear-gradient(90deg, var(--db-line) 0%, rgba(34,48,74,0.15) 100%);
}

.db-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--db-line);
  background: var(--db-console);
  color: var(--db-muted);
  font-family: var(--db-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border-radius: var(--db-radius);
}

.db-tag--gold { border-color: rgba(233,180,76,0.5); color: var(--db-gold); }
.db-tag--cyan { border-color: rgba(63,216,206,0.5); color: var(--db-cyan); }
.db-tag--orange { border-color: rgba(255,138,61,0.5); color: var(--db-orange); }

/* ---------- 骨架 ---------- */
.db-wrap {
  width: 100%;
  max-width: var(--db-max);
  margin: 0 auto;
  padding-left: var(--db-pad);
  padding-right: var(--db-pad);
}

.db-section {
  position: relative;
  padding: clamp(40px, 7vw, 88px) 0;
}

.db-prose {
  max-width: 34em;
  color: var(--db-text);
  font-size: 17px;
  line-height: 1.75;
}

.db-prose h2 { margin-top: 1.8em; }
.db-prose h2:first-child { margin-top: 0; }
.db-prose h3 { margin-top: 1.6em; }

.db-grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 30px);
}

.db-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.db-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.db-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.db-card {
  position: relative;
  padding: clamp(18px, 2.2vw, 26px);
  background: var(--db-console);
  border: 1px solid var(--db-line);
  border-radius: var(--db-radius);
}

.db-card--panel { background: var(--db-panel); }
.db-card--teal { background: var(--db-teal); border-color: rgba(63,216,206,0.22); }
.db-card--indigo { background: var(--db-indigo); border-color: rgba(233,180,76,0.18); }

/* ---------- 面包屑 ---------- */
.db-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--db-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--db-muted);
}

.db-crumbs li { display: inline-flex; align-items: center; gap: 8px; }
.db-crumbs li + li::before { content: "/"; color: var(--db-line); }
.db-crumbs a { color: var(--db-muted); }
.db-crumbs a:hover { color: var(--db-cyan); }
.db-crumbs [aria-current="page"] { color: var(--db-gold); }

/* ---------- 按钮 ---------- */
.db-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid var(--db-line);
  background: var(--db-panel);
  color: var(--db-text);
  font-family: var(--db-font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  border-radius: var(--db-radius);
  transition: background 220ms var(--db-ease), color 220ms var(--db-ease), border-color 220ms var(--db-ease);
}

.db-btn:hover { background: var(--db-panel); border-color: var(--db-cyan); color: var(--db-cyan); }

.db-btn--gold {
  border-color: var(--db-gold);
  background: linear-gradient(160deg, rgba(233,180,76,0.18), rgba(233,180,76,0.02));
  color: var(--db-gold);
  clip-path: polygon(0 0, 100% 0, 100% 68%, calc(100% - 9px) 100%, 0 100%);
}

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

.db-btn--ghost { background: transparent; color: var(--db-muted); }
.db-btn--ghost:hover { color: var(--db-cyan); border-color: var(--db-cyan); background: rgba(63,216,206,0.06); }

/* ---------- 图片容器 ---------- */
.db-figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--db-line);
  border-radius: var(--db-radius);
  aspect-ratio: 16 / 9;
  background-color: var(--db-console);
  background-image:
    linear-gradient(155deg, rgba(20,38,74,0.9), rgba(7,14,28,0.95)),
    repeating-linear-gradient(90deg, rgba(233,180,76,0.16) 0 1px, transparent 1px 38px),
    repeating-linear-gradient(0deg, rgba(63,216,206,0.10) 0 1px, transparent 1px 38px);
  background-blend-mode: normal, normal, normal;
}

.db-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(115deg, rgba(233,180,76,0.14) 0%, transparent 42%, rgba(63,216,206,0.10) 100%);
}

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

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

.db-figure__cap {
  margin-top: 10px;
  font-family: var(--db-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--db-muted);
}

/* ---------- 跳转链接 ---------- */
.db-skip {
  position: fixed;
  top: 10px;
  left: 50%;
  transform: translate(-50%, -220%);
  z-index: 200;
  padding: 10px 20px;
  background: var(--db-gold);
  color: var(--db-ink);
  font-family: var(--db-font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  border-radius: var(--db-radius);
  transition: transform 200ms var(--db-ease);
}

.db-skip:hover,
.db-skip:focus {
  transform: translate(-50%, 0);
  color: var(--db-ink);
}

/* ==========================================================================
   头部
   ========================================================================== */
.db-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(7,14,28,0.94);
  border-bottom: 1px solid var(--db-line);
  color: var(--db-text);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.db-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background-image: repeating-linear-gradient(90deg, rgba(233,180,76,0.55) 0 1px, transparent 1px 16px);
  pointer-events: none;
}

.db-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  width: 100%;
  max-width: var(--db-max);
  margin: 0 auto;
  padding: 0 var(--db-pad);
  min-height: var(--db-header-h);
}

.db-header__left {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 18px);
  flex: 0 0 auto;
}

.db-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  flex: 0 0 auto;
}

/* 品牌 */
.db-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: inherit;
}

.db-brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border: 1px solid var(--db-gold);
  background: linear-gradient(140deg, rgba(233,180,76,0.20), rgba(233,180,76,0.01) 70%);
  color: var(--db-gold);
  font-family: var(--db-font-head);
  font-size: 17px;
  font-weight: 800;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.db-brand__text { display: flex; flex-direction: column; line-height: 1.15; }

.db-brand__text strong {
  font-family: var(--db-font-head);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--db-text);
}

.db-brand__text small {
  font-family: var(--db-font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--db-muted);
}

.db-brand:hover .db-brand__text strong { color: var(--db-gold); }

/* 版本读数牌 */
.db-version-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 10px;
  border: 1px solid var(--db-line);
  background: var(--db-console);
  border-radius: var(--db-radius);
  white-space: nowrap;
}

.db-version-chip__label {
  font-size: 11px;
  color: var(--db-muted);
  letter-spacing: 0.08em;
}

.db-version-chip__value {
  font-family: var(--db-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--db-cyan);
  letter-spacing: 0.04em;
}

/* 导航 */
.db-nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 34px);
  margin-left: auto;
}

.db-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(2px, 1.4vw, 20px);
}

.db-nav__list--secondary {
  position: relative;
  padding-left: clamp(14px, 2.4vw, 34px);
}

.db-nav__list--secondary::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14%;
  bottom: 14%;
  width: 1px;
  background: var(--db-line);
}

.db-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 8px 2px;
  font-family: var(--db-font-body);
  font-size: 14px;
  letter-spacing: 0.01em;
  color: var(--db-muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color 220ms var(--db-ease);
}

.db-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 1px;
  background: var(--db-cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 220ms var(--db-ease), background 220ms var(--db-ease);
}

.db-nav a:hover { color: var(--db-text); }
.db-nav a:hover::after { transform: scaleX(1); }

.db-nav a[aria-current="page"] { color: var(--db-gold); }
.db-nav a[aria-current="page"]::after {
  background: var(--db-gold);
  transform: scaleX(1);
}

/* 头部按钮 */
.db-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 17px;
  border: 1px solid var(--db-gold);
  background: linear-gradient(160deg, rgba(233,180,76,0.18), rgba(233,180,76,0.02));
  color: var(--db-gold);
  font-family: var(--db-font-body);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  white-space: nowrap;
  border-radius: var(--db-radius);
  clip-path: polygon(0 0, 100% 0, 100% 68%, calc(100% - 9px) 100%, 0 100%);
  transition: background 220ms var(--db-ease), color 220ms var(--db-ease);
}

.db-cta:hover { background: var(--db-gold); color: var(--db-ink); }

.db-ghost {
  display: inline-flex;
  align-items: center;
  padding: 9px 14px;
  border: 1px solid var(--db-line);
  background: transparent;
  color: var(--db-muted);
  font-family: var(--db-font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-decoration: none;
  white-space: nowrap;
  border-radius: var(--db-radius);
  transition: color 220ms var(--db-ease), border-color 220ms var(--db-ease), background 220ms var(--db-ease);
}

.db-ghost:hover {
  color: var(--db-cyan);
  border-color: var(--db-cyan);
  background: rgba(63,216,206,0.07);
}

/* 移动导航按钮 */
.db-nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--db-line);
  background: var(--db-console);
  color: var(--db-text);
  cursor: pointer;
  border-radius: var(--db-radius);
  transition: color 220ms var(--db-ease), border-color 220ms var(--db-ease);
}

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

.db-nav-toggle[aria-expanded="true"] {
  border-color: var(--db-gold);
  color: var(--db-gold);
}

.db-nav-toggle__bars {
  display: block;
  width: 16px;
  height: 11px;
  background-image: linear-gradient(currentColor 0 1px, transparent 1px);
  background-size: 100% 5px;
  background-repeat: repeat-y;
  background-position: 0 0;
  transition: opacity 220ms var(--db-ease);
}

/* 滚动读数条 */
.db-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--db-cyan), var(--db-gold) 70%, var(--db-orange));
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

/* 头部 · 平板 */
@media (max-width: 1180px) {
  .db-ghost { display: none; }
  .db-nav a { font-size: 13.5px; }
}

/* 头部 · 移动端 */
@media (max-width: 980px) {
  :root { --db-header-h: 62px; }

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

  .db-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    padding: 8px var(--db-pad) 20px;
    background: var(--db-console);
    border-bottom: 1px solid var(--db-line);
    box-shadow: 0 24px 48px rgba(0,0,0,0.55);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity 220ms var(--db-ease), transform 220ms var(--db-ease), visibility 220ms;
  }

  .db-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

  .db-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .db-nav__list--secondary {
    padding-left: 0;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--db-line);
  }

  .db-nav__list--secondary::before { display: none; }

  .db-nav a {
    padding: 13px 4px;
    font-size: 15px;
    border-bottom: 1px solid rgba(34,48,74,0.7);
  }

  .db-nav a::after { display: none; }

  .db-nav a[aria-current="page"] {
    color: var(--db-gold);
    box-shadow: inset 2px 0 0 var(--db-gold);
    padding-left: 12px;
  }
}

@media (max-width: 560px) {
  .db-version-chip { display: none; }
  .db-header__actions { gap: 8px; }
  .db-cta { padding: 8px 13px; font-size: 12.5px; }
}

/* ==========================================================================
   页脚
   ========================================================================== */
.db-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  background: linear-gradient(180deg, var(--db-ink) 0%, var(--db-console) 100%);
  border-top: 1px solid var(--db-line);
  color: var(--db-muted);
  font-size: 14px;
}

.db-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background-image: repeating-linear-gradient(90deg, rgba(233,180,76,0.55) 0 1px, transparent 1px 24px);
  pointer-events: none;
}

.db-footer__inner {
  width: 100%;
  max-width: var(--db-max);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 66px) var(--db-pad) 26px;
}

.db-footer__top {
  display: grid;
  grid-template-columns: minmax(200px, 1.1fr) 2.8fr;
  gap: clamp(28px, 5vw, 64px);
}

.db-footer__brand { display: flex; flex-direction: column; gap: 14px; }

.db-brand--footer .db-brand__mark { border-color: rgba(233,180,76,0.6); }

.db-footer__tag {
  margin: 0;
  max-width: 22em;
  color: var(--db-muted);
  font-size: 13.5px;
  line-height: 1.7;
}

.db-footer__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 36px);
}

.db-footer__title {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--db-line);
  font-family: var(--db-font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--db-gold);
}

.db-footer__col ul {
  display: grid;
  gap: 10px;
}

.db-footer__col a {
  color: var(--db-muted);
  font-size: 14px;
  text-decoration: none;
  transition: color 180ms var(--db-ease);
}

.db-footer__col a:hover { color: var(--db-cyan); }

.db-footer__meta {
  gap: 12px;
  font-size: 13px;
  line-height: 1.65;
}

.db-footer__meta .db-mono {
  color: var(--db-cyan);
  font-size: 12.5px;
  word-break: break-all;
}

.db-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 28px;
  margin-top: clamp(32px, 5vw, 52px);
  padding-top: 20px;
  border-top: 1px solid var(--db-line);
  font-family: var(--db-font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--db-muted);
}

.db-footer__base p { margin: 0; }
.db-footer__icp { color: var(--db-gold); }
.db-footer__copy { color: var(--db-muted); }

.db-footer__note {
  flex: 1 1 260px;
  min-width: 0;
  color: rgba(169,184,206,0.75);
  font-family: var(--db-font-body);
  font-size: 12.5px;
  letter-spacing: 0.01em;
}

@media (max-width: 1024px) {
  .db-footer__top { grid-template-columns: 1fr; }
  .db-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 560px) {
  .db-footer__grid { grid-template-columns: 1fr; gap: 26px; }
  .db-footer__base { gap: 8px 18px; font-size: 11px; }
  .db-footer__note { flex-basis: 100%; }
}

/* ==========================================================================
   通用响应式
   ========================================================================== */
@media (max-width: 980px) {
  body { font-size: 16px; }
  h1 { font-size: 30px; }
  h2 { font-size: 23px; }
  h3 { font-size: 19px; }
  .db-prose { font-size: 16px; }
  .db-grid--3,
  .db-grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .db-grid--2,
  .db-grid--3,
  .db-grid--4 { grid-template-columns: minmax(0, 1fr); }
  .db-section { padding: 36px 0; }
}

/* ==========================================================================
   无障碍 · 减弱动效
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
    scroll-behavior: auto !important;
  }

  .db-nav,
  .db-nav a::after,
  .db-progress,
  .db-skip { transition: none !important; }
}