/* ============================================================
   /assets/site.css — 竞博指南中文专区 · 共享外壳样式
   深海控制台：细边界 / 面板堆叠 / 电光青锚点 / 等宽对照
   ============================================================ */

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

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

body { margin: 0; }

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

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

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

figure { margin: 0; }

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

a:hover { text-decoration: none; }

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

/* ---------- 2. Tokens ---------- */
:root {
  --ink-0: #02050A;
  --ink-1: #05090F;
  --ink-2: #0C1524;
  --ink-3: #16233A;
  --ink-4: #2A2E4A;

  --line: #243049;
  --line-soft: rgba(36, 48, 73, 0.62);
  --line-bright: #3B5580;

  --fg: #EAF0F8;
  --fg-dim: #94A3B8;
  --fg-mute: #5A6B88;

  --cyan: #12E6D2;
  --amber: #FF9E2C;
  --violet: #6C5FA0;
  --ok: #3DDC97;

  --shell: 1320px;
  --gutter: clamp(18px, 4vw, 44px);

  --font-ui: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC",
    "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular,
    Menlo, Consolas, monospace;

  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --dur: 200ms;
}

/* ---------- 3. Base typography ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.75;
  color: var(--fg);
  background-color: var(--ink-1);
  background-image:
    radial-gradient(1200px 620px at 78% -12%, rgba(18, 230, 210, 0.07), transparent 62%),
    radial-gradient(900px 520px at 4% 6%, rgba(108, 95, 160, 0.16), transparent 64%),
    linear-gradient(180deg, #060B13 0%, var(--ink-1) 42%, #04070C 100%);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5 {
  margin: 0;
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--fg);
}

h1 { font-size: clamp(28px, 4.4vw, 46px); }
h2 { font-size: clamp(23px, 3.1vw, 34px); }
h3 { font-size: clamp(19px, 2.2vw, 26px); }
p  { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

::selection {
  background: rgba(18, 230, 210, 0.28);
  color: #FFFFFF;
}

/* ---------- 4. Layout primitives ---------- */
.container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: clamp(40px, 6vw, 72px);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 28px);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px 24px;
  margin-bottom: clamp(18px, 2.4vw, 28px);
}

.hairline {
  height: 1px;
  border: 0;
  margin: 0;
  background: linear-gradient(90deg, var(--line), rgba(36, 48, 73, 0.15));
}

/* ---------- 5. Small typographic parts ---------- */
.mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
  letter-spacing: 0.04em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--cyan);
  box-shadow: 0 0 8px rgba(18, 230, 210, 0.6);
}

.note-rotated {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--fg-mute);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--fg-dim);
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(12, 21, 36, 0.7);
}

.tag--cyan {
  color: var(--cyan);
  border-color: rgba(18, 230, 210, 0.34);
  background: rgba(18, 230, 210, 0.08);
}

.tag--amber {
  color: var(--amber);
  border-color: rgba(255, 158, 44, 0.36);
  background: rgba(255, 158, 44, 0.08);
}

/* ---------- 6. Panels ---------- */
.panel {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: linear-gradient(180deg, #0C1524 0%, #0A1220 100%);
  box-shadow:
    0 26px 60px -46px #000000,
    inset 0 1px 0 rgba(234, 240, 248, 0.045);
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 18px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #16233A 0%, rgba(22, 35, 58, 0.32) 100%);
  border-radius: 2px 2px 0 0;
}

.panel-title {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--fg);
}

.panel-body {
  padding: clamp(18px, 2.4vw, 28px);
}

/* ---------- 7. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 2px;
  background: transparent;
  cursor: pointer;
  transition: background var(--dur) var(--ease),
    border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.btn:hover {
  border-color: var(--line-bright);
  background: rgba(18, 230, 210, 0.07);
  color: var(--cyan);
}

.btn--primary {
  color: #04120F;
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 10px 30px -16px rgba(18, 230, 210, 0.8);
}

.btn--primary:hover {
  color: #04120F;
  background: #3BF3E2;
  border-color: #3BF3E2;
}

.btn--ghost {
  color: var(--fg-dim);
  border-color: var(--line);
  background: rgba(12, 21, 36, 0.6);
}

.btn--ghost:hover {
  color: var(--fg);
  border-color: var(--line-bright);
  background: rgba(22, 35, 58, 0.75);
}

.btn--amber {
  color: #1A0F02;
  background: var(--amber);
  border-color: var(--amber);
}

.btn--amber:hover {
  color: #1A0F02;
  background: #FFB65C;
  border-color: #FFB65C;
}

/* ---------- 8. Breadcrumbs ---------- */
.breadcrumbs {
  padding-block: 12px;
  border-bottom: 1px solid var(--line-soft);
}

.crumbs-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--fg-mute);
}

.crumbs-item { display: inline-flex; align-items: center; color: var(--fg-mute); }

.crumbs-item a { color: var(--fg-dim); }
.crumbs-item a:hover { color: var(--cyan); }

.crumbs-item:not(:last-child)::after {
  content: "/";
  margin-left: 8px;
  color: #33415A;
}

.crumbs-item:last-child { color: var(--fg); }

/* ---------- 9. Index rail (chapter track) ---------- */
.index-rail {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-left: 1px solid var(--line);
}

.rail-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0 9px 14px;
  font-size: 13px;
  color: var(--fg-dim);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.rail-link:hover { color: var(--fg); background: rgba(18, 230, 210, 0.05); }

.rail-link::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: transparent;
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.rail-link[aria-current="true"] {
  color: var(--fg);
  background: rgba(18, 230, 210, 0.07);
}

.rail-link[aria-current="true"]::before {
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(18, 230, 210, 0.65);
}

/* ---------- 10. Media frames (page-stage image slots) ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
  border-radius: 3px;
  background-color: #0A1220;
  background-image:
    linear-gradient(180deg, rgba(22, 35, 58, 0.9) 0%, rgba(12, 21, 36, 0.92) 100%),
    repeating-linear-gradient(90deg, rgba(18, 230, 210, 0.07) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(0deg, rgba(108, 95, 160, 0.09) 0 1px, transparent 1px 44px);
}

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

.media-frame::after {
  content: "";
  position: absolute;
  right: 10px;
  bottom: 10px;
  width: 26px;
  height: 26px;
  border-right: 1px solid rgba(18, 230, 210, 0.5);
  border-bottom: 1px solid rgba(18, 230, 210, 0.5);
  pointer-events: none;
}

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

/* ---------- 11. Skip link ---------- */
.skip-link {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 200;
  transform: translateY(-130%);
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 700;
  color: #04120F;
  background: var(--cyan);
  border-radius: 0 0 3px 0;
  transition: transform 160ms var(--ease);
}

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

/* ---------- 12. Site header (command bar) ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  color: var(--fg);
  background: rgba(5, 9, 15, 0.93);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px) saturate(130%);
  -webkit-backdrop-filter: blur(14px) saturate(130%);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 8px var(--gutter);
}

/* brand */
.brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 12px;
  color: var(--fg);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #04120F;
  background: linear-gradient(150deg, #35F5E4 0%, #0BB9AC 100%);
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
  box-shadow: 0 0 24px -10px rgba(18, 230, 210, 0.9);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.16;
}

.brand-name {
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--fg);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-mute);
}

.brand-ver {
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--amber);
  border: 1px solid rgba(255, 158, 44, 0.36);
  border-radius: 2px;
  background: rgba(255, 158, 44, 0.07);
}

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

.cmd-list {
  display: flex;
  align-items: center;
  gap: 2px;
  min-width: 0;
}

.cmd-item { flex: 0 0 auto; }

.cmd-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 11px 12px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.01em;
  white-space: nowrap;
  color: var(--fg-dim);
  border-radius: 2px;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.cmd-idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: #44556F;
  transition: color var(--dur) var(--ease);
}

.cmd-link:hover {
  color: var(--fg);
  background: rgba(18, 230, 210, 0.07);
}

.cmd-link:hover .cmd-idx { color: var(--cyan); }

.cmd-link[aria-current="page"] { color: var(--fg); }
.cmd-link[aria-current="page"] .cmd-idx { color: var(--cyan); }

.cmd-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 3px;
  height: 2px;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(18, 230, 210, 0.75);
}

/* header side cluster */
.header-side {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 14px;
  margin-left: auto;
}

.header-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  white-space: nowrap;
  color: var(--fg-dim);
}

.status-dot {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 3px rgba(255, 158, 44, 0.16);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
  color: #04120F;
  background: var(--cyan);
  border: 1px solid var(--cyan);
  border-radius: 2px;
  box-shadow: 0 10px 26px -18px rgba(18, 230, 210, 0.95);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.header-cta::after {
  content: "›";
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1;
}

.header-cta:hover {
  background: #3BF3E2;
  border-color: #3BF3E2;
}

.header-cta:focus-visible {
  outline-color: var(--amber);
}

/* mobile toggle */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 2px;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 14px;
}

.nav-toggle-bars span {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) {
  transform: translateY(4.5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) {
  transform: translateY(-4.5px) rotate(-45deg);
}

/* reading progress */
.read-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  background: rgba(36, 48, 73, 0.85);
}

.read-progress-fill {
  display: block;
  height: 100%;
  width: var(--read, 0%);
  background: linear-gradient(90deg, var(--violet) 0%, var(--cyan) 100%);
  box-shadow: 0 0 12px rgba(18, 230, 210, 0.7);
  transition: width 120ms linear;
}

/* ---------- 13. Site footer ---------- */
.site-footer {
  margin-top: clamp(56px, 8vw, 110px);
  color: var(--fg-dim);
  background: linear-gradient(180deg, #04070C 0%, var(--ink-0) 100%);
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.6fr 0.9fr 1fr 1.5fr 0.9fr;
  gap: 30px 26px;
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(38px, 5vw, 64px) var(--gutter) clamp(28px, 3vw, 40px);
}

.footer-brand { display: flex; flex-direction: column; gap: 12px; }

.footer-lockup {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  color: var(--fg);
}

.footer-lockup-name {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.footer-brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-mute);
}

.footer-note {
  margin: 0;
  max-width: 30ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--fg-mute);
}

.footer-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--fg-dim);
}

.footer-col { display: flex; flex-direction: column; gap: 10px; min-width: 0; }

.footer-col-title {
  margin: 0;
  padding-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-mute);
  border-bottom: 1px solid var(--line-soft);
}

.footer-list { display: flex; flex-direction: column; gap: 7px; }

.footer-link {
  display: inline-block;
  font-size: 13.5px;
  color: var(--fg-dim);
  transition: color var(--dur) var(--ease);
}

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

.footer-link--strong {
  margin-top: 4px;
  font-weight: 700;
  color: var(--cyan);
}

.footer-text {
  font-size: 13px;
  line-height: 1.65;
  color: var(--fg-mute);
  word-break: break-word;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 14px var(--gutter) 22px;
  border-top: 1px solid var(--line-soft);
}

.footer-legal-line,
.footer-meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: #4B5B76;
}

/* ---------- 14. Responsive ---------- */
@media (max-width: 1180px) {
  .cmd-link { padding: 11px 9px; font-size: 13.5px; }
  .cmd-idx { display: none; }
  .footer-inner { grid-template-columns: 1.4fr 1fr 1fr 1.4fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .header-inner {
    gap: 0;
    padding-block: 10px;
    row-gap: 0;
  }

  .brand { order: 1; }
  .header-side { order: 2; margin-left: auto; gap: 10px; }
  .nav-toggle { display: inline-flex; }

  .cmd-nav {
    order: 3;
    flex: 1 0 100%;
    display: none;
    justify-content: flex-start;
    margin-top: 10px;
    padding-top: 8px;
    border-top: 1px solid var(--line-soft);
  }

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

  .cmd-list {
    flex-wrap: nowrap;
    gap: 4px;
    overflow-x: auto;
    padding-bottom: 6px;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .cmd-list::-webkit-scrollbar { display: none; }

  .cmd-link { padding: 8px 12px; font-size: 13px; }
  .cmd-idx { display: inline; }

  .cmd-link[aria-current="page"]::after {
    left: 12px;
    right: 12px;
    bottom: 0;
  }

  .header-status { font-size: 10.5px; letter-spacing: 0.08em; }

  .footer-inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }

  .brand-ver { display: none; }
  .header-status { display: none; }
  .header-cta { padding: 8px 12px; font-size: 12px; }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
  }

  .footer-legal { flex-direction: column; align-items: flex-start; }

  .grid-12 { gap: 16px; }
}

/* ---------- 15. Focus & motion preferences ---------- */
@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;
  }

  .read-progress-fill { transition: none; }
}