/* ==========================================================================
   幻影赛场 · 全站共享样式 site.css
   视觉母题：赛场技术蓝图 / 数据指挥面板
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

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

ul,
ol {
  list-style: none;
}

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

/* ---------- 2. Design Tokens ---------- */
:root {
  /* 色彩 */
  --c-pitch: #0B3D2E;
  --c-engine: #0A1F2F;
  --c-neon: #00F0FF;
  --c-silver: #C0C0C0;
  --c-wine: #6B1A32;
  --c-indigo: #3B2E8A;
  --c-text: #E8F0F0;
  --c-text-dim: #A0B0B0;
  --c-black: #030807;
  --c-black-soft: #06140E;

  /* 字体 */
  --font-head: "Archivo Black", "Arial Black", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-data: "Roboto Mono", "SF Mono", "Consolas", "Courier New", monospace;

  /* 字号 */
  --fs-hero: clamp(40px, 5.6vw, 68px);
  --fs-h2: clamp(22px, 2.8vw, 36px);
  --fs-h3: clamp(17px, 1.6vw, 22px);
  --fs-body: 15px;
  --fs-sm: 13px;
  --fs-xs: 11px;

  /* 字重 */
  --fw-black: 900;
  --fw-bold: 700;
  --fw-medium: 500;
  --fw-light: 200;

  /* 布局 */
  --topbar-h: 64px;
  --nav-w: 262px;
  --content-max: 1200px;
  --pad: clamp(16px, 3vw, 40px);

  /* 效果 */
  --line-soft: 1px solid rgba(192, 192, 192, 0.15);
  --shadow-card: 0 6px 24px rgba(0, 0, 0, 0.32);
  --shadow-panel: 0 12px 32px rgba(0, 0, 0, 0.5);
  --transition: 180ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ---------- 3. Base ---------- */
body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--c-text);
  background-color: var(--c-pitch);
  background-image:
    linear-gradient(to right, rgba(192, 192, 192, 0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(192, 192, 192, 0.045) 1px, transparent 1px);
  background-size: 48px 48px;
}

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

::selection {
  background: rgba(0, 240, 255, 0.28);
  color: var(--c-text);
}

/* ---------- 4. 工具类 ---------- */
.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;
}

.container {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.bg-pitch {
  background-color: var(--c-pitch);
}

.bg-engine {
  background-color: var(--c-engine);
}

.grid-overlay {
  background-image:
    linear-gradient(to right, rgba(192, 192, 192, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(192, 192, 192, 0.06) 1px, transparent 1px);
  background-size: 32px 32px;
}

.grid-overlay--fine {
  background-size: 16px 16px;
}

/* ---------- 5. 按钮体系 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  letter-spacing: 0.04em;
  line-height: 1;
  padding: 11px 18px;
  border: 1px solid transparent;
  transition:
    background var(--transition),
    border-color var(--transition),
    color var(--transition),
    transform var(--transition);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(2px);
  transition-duration: 100ms;
}

.btn-accent {
  background: var(--c-neon);
  border-color: var(--c-neon);
  color: #00252C;
  font-weight: var(--fw-bold);
}

.btn-accent:hover {
  background: transparent;
  color: var(--c-neon);
  border-color: var(--c-neon);
}

.btn-ghost {
  border-color: rgba(192, 192, 192, 0.35);
  color: var(--c-text);
}

.btn-ghost:hover {
  border-color: var(--c-neon);
  color: var(--c-neon);
  background: rgba(0, 240, 255, 0.05);
}

.btn-sm {
  padding: 8px 14px;
  font-size: 13px;
}

.btn__arrow {
  font-family: var(--font-data);
  font-size: 13px;
  transition: transform var(--transition);
}

.btn:hover .btn__arrow {
  transform: translateX(3px);
}

.icon-btn {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--c-silver);
  border: 1px solid rgba(192, 192, 192, 0.22);
  transition:
    color var(--transition),
    border-color var(--transition),
    background var(--transition),
    transform var(--transition);
}

.icon-btn:hover {
  color: var(--c-neon);
  border-color: var(--c-neon);
  background: rgba(0, 240, 255, 0.06);
}

.icon-btn:active {
  transform: translateY(1px);
}

/* ---------- 6. 顶部命令栏 ---------- */
.site-header {
  position: relative;
}

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--topbar-h);
  background: rgba(3, 8, 7, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(192, 192, 192, 0.14);
  z-index: 120;
}

.topbar__inner {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(16px, 3vw, 32px);
}

.topbar__inner::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: -1px;
  width: var(--nav-w);
  border-right: 1px solid rgba(192, 192, 192, 0.14);
  background: rgba(10, 31, 47, 0.35);
  display: none;
}

@media (min-width: 992px) {
  .topbar__inner::before {
    display: block;
  }
}

.topbar__actions {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ---------- 7. 品牌标识 ---------- */
.brand-logo {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 11px;
}

.brand-logo__svg {
  flex-shrink: 0;
}

.brand-logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-logo__text strong {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: var(--fw-black);
  letter-spacing: 0.05em;
  color: var(--c-text);
  white-space: nowrap;
}

.brand-logo__text small {
  font-family: var(--font-data);
  font-size: 9px;
  letter-spacing: 0.24em;
  color: var(--c-neon);
}

@media (max-width: 560px) {
  .brand-logo__text small {
    display: none;
  }
}

/* ---------- 8. 移动导航开关 ---------- */
.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 38px;
  height: 38px;
  padding: 8px;
  border: 1px solid rgba(192, 192, 192, 0.22);
  transition: border-color var(--transition), background var(--transition);
}

.nav-toggle__line {
  display: block;
  height: 2px;
  background: var(--c-silver);
  transition:
    transform 0.25s ease,
    opacity 0.2s ease,
    background var(--transition);
}

.nav-toggle:hover .nav-toggle__line {
  background: var(--c-neon);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (min-width: 992px) {
  .nav-toggle {
    display: none;
  }
}

/* ---------- 9. 快速直达浮层 ---------- */
.search-panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 320px;
  max-width: 86vw;
  background: var(--c-engine);
  border: 1px solid rgba(192, 192, 192, 0.25);
  box-shadow: var(--shadow-panel);
  padding: 0 0 8px;
  z-index: 130;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition:
    opacity var(--transition),
    transform var(--transition),
    visibility var(--transition);
}

.search-panel[data-open="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.search-panel__label {
  font-family: var(--font-data);
  font-size: 10px;
  font-weight: var(--fw-light);
  letter-spacing: 0.24em;
  color: var(--c-neon);
  padding: 14px 16px 10px;
  border-bottom: 1px solid rgba(192, 192, 192, 0.12);
  margin-bottom: 6px;
}

.search-panel__links a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 16px;
  font-size: 14px;
  color: var(--c-text-dim);
  border-left: 2px solid transparent;
  transition:
    border-color var(--transition),
    background var(--transition),
    color var(--transition);
}

.search-panel__links a:hover {
  background: rgba(0, 240, 255, 0.06);
  border-left-color: var(--c-neon);
  color: var(--c-neon);
}

.search-panel__num {
  font-family: var(--font-data);
  font-size: 10px;
  color: var(--c-silver);
  opacity: 0.6;
  flex-shrink: 0;
}

/* ---------- 10. 侧边悬浮导航 ---------- */
.side-nav {
  position: fixed;
  top: var(--topbar-h);
  left: 0;
  bottom: 0;
  width: min(320px, 88vw);
  height: calc(100vh - var(--topbar-h));
  display: flex;
  flex-direction: column;
  background-color: var(--c-engine);
  background-image:
    linear-gradient(to right, rgba(192, 192, 192, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(192, 192, 192, 0.07) 1px, transparent 1px);
  background-size: 24px 24px;
  border-right: 1px solid rgba(192, 192, 192, 0.16);
  transform: translateX(-105%);
  transition: transform 0.3s ease;
  z-index: 110;
}

.side-nav::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at 0 0, rgba(0, 240, 255, 0.06), transparent 42%);
  pointer-events: none;
}

.side-nav[data-open="true"] {
  transform: translateX(0);
  box-shadow: 12px 0 40px rgba(0, 0, 0, 0.45);
}

@media (min-width: 992px) {
  .side-nav {
    width: var(--nav-w);
    transform: translateX(0);
    transition: none;
    box-shadow: none;
  }
}

.side-nav__head {
  position: relative;
  padding: 18px 20px 14px;
  border-bottom: 1px solid rgba(192, 192, 192, 0.14);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.side-nav__coord {
  font-family: var(--font-data);
  font-size: 10px;
  font-weight: var(--fw-light);
  letter-spacing: 0.12em;
  color: var(--c-text-dim);
}

.side-nav__index {
  font-family: var(--font-data);
  font-size: 10px;
  font-weight: var(--fw-light);
  letter-spacing: 0.2em;
  color: var(--c-neon);
}

.nav-list {
  flex: 1;
  overflow-y: auto;
  padding: 10px 0;
  position: relative;
}

.nav-item {
  border-bottom: 1px solid rgba(192, 192, 192, 0.07);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  border-left: 3px solid transparent;
  transition:
    background var(--transition),
    border-color var(--transition);
}

.nav-link:hover {
  background: rgba(0, 240, 255, 0.05);
  border-left-color: var(--c-neon);
}

.nav-link__num {
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: var(--fw-light);
  color: var(--c-text-dim);
  width: 20px;
  flex-shrink: 0;
  transition: color var(--transition);
}

.nav-link__label {
  font-size: 15px;
  font-weight: var(--fw-medium);
  letter-spacing: 0.08em;
  color: var(--c-text);
  flex: 1;
  transition: color var(--transition);
}

.nav-link__sub {
  font-family: var(--font-data);
  font-size: 9px;
  font-weight: var(--fw-light);
  letter-spacing: 0.14em;
  color: var(--c-text-dim);
  opacity: 0;
  transform: translateX(-4px);
  transition:
    opacity var(--transition),
    transform var(--transition),
    color var(--transition);
}

.nav-link:hover .nav-link__num {
  color: var(--c-neon);
}

.nav-link:hover .nav-link__sub {
  color: var(--c-neon);
  opacity: 1;
  transform: translateX(0);
}

.nav-link[aria-current="page"] {
  background: rgba(0, 240, 255, 0.09);
  border-left-color: var(--c-neon);
}

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

.nav-link[aria-current="page"] .nav-link__label {
  color: var(--c-neon);
  font-weight: var(--fw-bold);
}

.nav-link[aria-current="page"] .nav-link__sub {
  color: var(--c-neon);
  opacity: 1;
  transform: translateX(0);
}

.side-nav__foot {
  padding: 16px 20px;
  border-top: 1px solid rgba(192, 192, 192, 0.14);
  position: relative;
}

.side-nav__cta {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 12px;
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid rgba(0, 240, 255, 0.25);
  margin-bottom: 12px;
  transition:
    background var(--transition),
    border-color var(--transition);
}

.side-nav__cta:hover {
  background: rgba(0, 240, 255, 0.14);
  border-color: var(--c-neon);
}

.side-nav__cta-dot {
  width: 6px;
  height: 6px;
  background: var(--c-neon);
  flex-shrink: 0;
  animation: nav-pulse 2.4s ease-in-out infinite;
}

@keyframes nav-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.side-nav__cta-text {
  font-size: 13px;
  font-weight: var(--fw-bold);
  color: var(--c-text);
  flex: 1;
}

.side-nav__cta-arrow {
  font-size: 13px;
  color: var(--c-neon);
}

.side-nav__statuses {
  display: flex;
  gap: 6px;
  margin-bottom: 10px;
}

.side-nav .tag {
  font-size: 9px;
  padding: 3px 8px;
  letter-spacing: 0.08em;
}

.side-nav__meta {
  font-family: var(--font-data);
  font-size: 9px;
  font-weight: var(--fw-light);
  letter-spacing: 0.22em;
  color: var(--c-text-dim);
  text-align: center;
}

/* ---------- 11. 返回顶部 ---------- */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 42px;
  height: 42px;
  background: var(--c-engine);
  border: 1px solid rgba(192, 192, 192, 0.3);
  color: var(--c-silver);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  z-index: 140;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition:
    opacity var(--transition),
    transform var(--transition),
    visibility var(--transition),
    background var(--transition),
    border-color var(--transition),
    color var(--transition);
}

.back-to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--c-neon);
  border-color: var(--c-neon);
  color: #00252C;
}

.back-to-top:active {
  transform: translateY(1px);
}

/* ---------- 12. 页脚 ---------- */
.site-footer {
  background-color: var(--c-engine);
  background-image:
    linear-gradient(to right, rgba(192, 192, 192, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(192, 192, 192, 0.05) 1px, transparent 1px);
  background-size: 40px 40px;
  border-top: 1px solid rgba(192, 192, 192, 0.16);
  color: var(--c-text-dim);
  font-size: 14px;
}

.footer-main {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 44px var(--pad) 32px;
}

@media (min-width: 640px) {
  .footer-main {
    grid-template-columns: 1fr 1fr;
  }

  .footer-col--brand {
    grid-column: 1 / -1;
  }
}

@media (min-width: 992px) {
  .footer-main {
    grid-template-columns: 2fr 0.9fr 1.3fr 0.8fr;
  }

  .footer-col--brand {
    grid-column: auto;
  }
}

.footer-col__title {
  font-size: 14px;
  font-weight: var(--fw-bold);
  color: var(--c-text);
  letter-spacing: 0.1em;
  margin-bottom: 16px;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.footer-col__index {
  font-family: var(--font-data);
  font-size: 10px;
  font-weight: var(--fw-light);
  color: var(--c-neon);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-list a {
  color: var(--c-text-dim);
  font-size: 14px;
  transition:
    color var(--transition),
    padding-left var(--transition);
}

.footer-list a:hover {
  color: var(--c-neon);
  padding-left: 4px;
}

.footer-list--contact {
  gap: 12px;
  font-size: 13px;
  line-height: 1.5;
}

.footer-contact__label {
  font-family: var(--font-data);
  font-size: 10px;
  font-weight: var(--fw-light);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-silver);
  display: block;
  margin-bottom: 2px;
}

.footer-brand__name {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: var(--fw-black);
  color: var(--c-text);
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}

.footer-brand__sub {
  font-family: var(--font-data);
  font-size: 10px;
  font-weight: var(--fw-light);
  letter-spacing: 0.22em;
  color: var(--c-neon);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.footer-col--brand {
  border-left: 2px solid rgba(0, 240, 255, 0.35);
  padding-left: 16px;
}

.footer-brand__desc {
  font-size: 13px;
  line-height: 1.75;
  margin-bottom: 14px;
  max-width: 46ch;
  color: var(--c-text-dim);
}

.footer-brand__trust {
  font-size: 12px;
  line-height: 1.7;
  color: var(--c-silver);
  border-left: 2px solid var(--c-neon);
  padding-left: 10px;
  max-width: 52ch;
}

.footer-col--meta {
  border-left: 1px solid rgba(192, 192, 192, 0.14);
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0;
}

@media (max-width: 991px) {
  .footer-col--meta {
    display: none;
  }
}

.footer-meta__line {
  font-family: var(--font-data);
  font-size: 10px;
  font-weight: var(--fw-light);
  letter-spacing: 0.18em;
  color: var(--c-text-dim);
  padding: 6px 0;
  border-bottom: 1px solid rgba(192, 192, 192, 0.07);
}

.footer-meta__line:last-child {
  border-bottom: none;
}

.footer-legal {
  border-top: 1px solid rgba(192, 192, 192, 0.14);
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 18px var(--pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 24px;
  font-size: 12px;
  color: var(--c-text-dim);
}

.footer-legal__links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
}

.footer-legal__links a {
  color: var(--c-text-dim);
  transition: color var(--transition);
}

.footer-legal__links a:hover {
  color: var(--c-neon);
}

.footer-legal__icp {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--c-text-dim);
}

.footer-legal__icp::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 4px;
  background: var(--c-neon);
  margin-right: 8px;
  vertical-align: middle;
}

@media (max-width: 639px) {
  .footer-legal {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-legal__copy {
    order: 2;
  }

  .footer-legal__links {
    order: 1;
  }

  .footer-legal__icp {
    order: 3;
  }
}

/* ---------- 13. 主内容骨架 ---------- */
#main-content {
  padding-top: calc(var(--topbar-h) + 32px);
  min-height: calc(100vh - var(--topbar-h));
}

@media (min-width: 992px) {
  #main-content {
    margin-left: var(--nav-w);
  }

  .site-footer {
    margin-left: var(--nav-w);
  }
}

/* ---------- 14. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--c-text-dim);
  padding: 16px 0;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  font-family: var(--font-data);
  color: var(--c-silver);
  opacity: 0.5;
  flex-shrink: 0;
}

.breadcrumb a {
  color: var(--c-text-dim);
  transition: color var(--transition);
}

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

.breadcrumb [aria-current="page"] {
  color: var(--c-text);
  font-weight: var(--fw-medium);
}

/* ---------- 15. 章节标题 ---------- */
.section-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(192, 192, 192, 0.14);
}

.section-head__index {
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: var(--fw-light);
  color: var(--c-neon);
  flex-shrink: 0;
}

.section-head__title {
  font-family: var(--font-head);
  font-size: var(--fs-h2);
  font-weight: var(--fw-black);
  color: var(--c-text);
  transform: skew(-3deg);
  letter-spacing: 0.02em;
  line-height: 1.2;
}

/* ---------- 16. 卡片 ---------- */
.card {
  background: rgba(10, 31, 47, 0.6);
  border: 1px solid rgba(192, 192, 192, 0.16);
  padding: 20px;
  transition:
    transform var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 240, 255, 0.5);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}

.card:focus-within {
  border-color: var(--c-neon);
}

/* ---------- 17. 标签 ---------- */
.tag {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: var(--fw-medium);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 4px 10px;
  border: 1px solid;
  line-height: 1.4;
}

.tag--wine {
  color: #E08A9E;
  border-color: rgba(107, 26, 50, 0.9);
  background: rgba(107, 26, 50, 0.3);
}

.tag--indigo {
  color: #B4A8E8;
  border-color: rgba(59, 46, 138, 0.9);
  background: rgba(59, 46, 138, 0.3);
}

.tag--neon {
  color: var(--c-neon);
  border-color: rgba(0, 240, 255, 0.4);
  background: rgba(0, 240, 255, 0.08);
}

/* ---------- 18. 层叠目录 ---------- */
.toc {
  border-left: 1px solid rgba(192, 192, 192, 0.2);
}

.toc__item {
  border-bottom: 1px solid rgba(192, 192, 192, 0.1);
}

.toc__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 16px;
  font-size: 14px;
  color: var(--c-text-dim);
  border-left: 2px solid transparent;
  transition:
    border-color var(--transition),
    color var(--transition),
    background var(--transition);
}

.toc__link:hover {
  color: var(--c-neon);
  border-left-color: var(--c-neon);
  background: rgba(0, 240, 255, 0.04);
}

.toc__num {
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: var(--fw-light);
  color: var(--c-silver);
  flex-shrink: 0;
}

/* ---------- 19. 技能树 ---------- */
.skill-tree {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  border: 1px solid rgba(192, 192, 192, 0.16);
  background: rgba(10, 31, 47, 0.5);
}

.skill-tree__node {
  position: relative;
  padding: 18px;
  border-left: 1px solid rgba(192, 192, 192, 0.14);
  text-align: center;
  transition:
    background var(--transition),
    border-color var(--transition);
}

.skill-tree__node:first-child {
  border-left: none;
}

.skill-tree__node::before {
  content: "";
  position: absolute;
  top: 50%;
  left: -4px;
  width: 8px;
  height: 8px;
  background: var(--c-engine);
  border: 1px solid var(--c-silver);
  transform: translateY(-50%) rotate(45deg);
  transition: background var(--transition), border-color var(--transition);
}

.skill-tree__node:first-child::before {
  display: none;
}

.skill-tree__node[data-active="true"] {
  background: rgba(0, 240, 255, 0.06);
  border-left-color: var(--c-neon);
}

.skill-tree__node[data-active="true"]::before {
  border-color: var(--c-neon);
  background: var(--c-neon);
}

.skill-tree__num {
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: var(--fw-light);
  color: var(--c-neon);
}

.skill-tree__title {
  display: block;
  font-size: 14px;
  font-weight: var(--fw-bold);
  color: var(--c-text);
  margin-top: 4px;
}

.skill-tree__desc {
  font-size: 13px;
  color: var(--c-text-dim);
  margin-top: 4px;
  line-height: 1.5;
}

@media (max-width: 899px) {
  .skill-tree {
    grid-auto-flow: row;
    grid-auto-rows: auto;
  }

  .skill-tree__node {
    border-left: none;
    border-top: 1px solid rgba(192, 192, 192, 0.14);
  }

  .skill-tree__node::before {
    top: -4px;
    left: 50%;
    transform: translateX(-50%) rotate(45deg);
  }

  .skill-tree__node:first-child {
    border-top: none;
  }
}

/* ---------- 20. 动效与无障碍 ---------- */
@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;
  }
}