/* ==========================================================
   幻影竞界 Site Kit 共享样式
   File: /assets/site.css
   ========================================================== */

/* ---------- 1. Design Tokens ---------- */
:root {
  --color-void: #0A0E14;
  --color-panel: #151B24;
  --color-phosphor: #B6FF2A;
  --color-volt: #7A5AF8;
  --color-arc: #E34F9E;
  --color-stream: #22D3EE;
  --color-paper: #F5F7FA;
  --color-dim: #9AA7B8;
  --color-line: #2C3543;
  --color-gold: #FFD166;

  --font-head: "DIN Alternate", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --font-body: "Inter", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --font-mono: "Roboto Mono", "SFMono-Regular", "SF Mono", "Cascadia Mono", Consolas, "Liberation Mono", monospace;

  --header-z: 100;
  --fixed-z: 300;
  --content-max: 1200px;
  --space-section: clamp(60px, 10vw, 120px);
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 110px;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-paper);
  background:
    radial-gradient(circle at 88% 8%, rgba(122, 90, 248, 0.09), transparent 34%),
    radial-gradient(circle at 10% 92%, rgba(182, 255, 42, 0.05), transparent 28%),
    var(--color-void);
  min-height: 100vh;
  overflow-x: hidden;
}

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

a {
  color: var(--color-stream);
  text-decoration: none;
  transition: color 0.25s ease;
}

a:hover {
  color: var(--color-phosphor);
}

p {
  margin-bottom: 1em;
}

ul,
ol {
  list-style: none;
}

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

strong,
b {
  font-weight: 700;
}

/* ---------- 3. Accessibility ---------- */
:focus-visible {
  outline: 3px solid var(--color-phosphor);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: fixed;
  top: -100%;
  left: 16px;
  z-index: calc(var(--fixed-z) + 1);
  padding: 12px 22px;
  background: var(--color-phosphor);
  color: var(--color-void);
  font-weight: 700;
  font-size: 14px;
  transition: top 0.25s ease;
}

.skip-link:focus {
  top: 16px;
}

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

::-webkit-scrollbar {
  width: 12px;
}

::-webkit-scrollbar-track {
  background: var(--color-void);
}

::-webkit-scrollbar-thumb {
  background: var(--color-line);
  border-radius: 6px;
  border: 2px solid var(--color-void);
}

/* ---------- 4. Layout Systems ---------- */
.page-wrap {
  width: min(100% - 48px, var(--content-max));
  margin-inline: auto;
}

.grid {
  display: grid;
  gap: 24px;
}

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

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

.section {
  position: relative;
  padding-block: var(--space-section);
}

.section + .section {
  border-top: 1px solid rgba(44, 53, 67, 0.55);
}

.section-head {
  position: relative;
  margin-bottom: 40px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--color-line);
}

.section-index {
  position: absolute;
  top: -28px;
  left: -10px;
  z-index: 0;
  font-family: var(--font-head);
  font-weight: 100;
  font-size: clamp(100px, 15vw, 210px);
  line-height: 0.85;
  color: transparent;
  -webkit-text-stroke: 1px rgba(60, 70, 88, 0.55);
  pointer-events: none;
  user-select: none;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-phosphor);
}

.section-tag::before {
  content: "";
  width: 28px;
  height: 4px;
  background: var(--color-volt);
  clip-path: polygon(0 0, 100% 0, calc(100% - 4px) 100%, 0 100%);
}

.section-title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.05;
  letter-spacing: 0.01em;
  color: var(--color-paper);
  margin-top: 8px;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--color-dim);
  padding-top: 28px;
}

.breadcrumbs a {
  color: var(--color-dim);
}

.breadcrumbs a:hover {
  color: var(--color-phosphor);
}

.breadcrumbs li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.breadcrumbs li + li::before {
  content: "/";
  color: var(--color-line);
}

.breadcrumbs .breadcrumbs-current {
  color: var(--color-paper);
  font-weight: 600;
}

/* ---------- 5. Shared Components ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 46px;
  padding: 11px 28px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-void);
  background: linear-gradient(120deg, var(--color-phosphor) 0%, #d6ff6a 100%);
  border: 1px solid var(--color-phosphor);
  position: relative;
  transition: transform 0.25s ease, background 0.25s ease, box-shadow 0.25s ease, color 0.25s ease;
}

.btn::after {
  content: "";
  position: absolute;
  right: -6px;
  bottom: 12px;
  width: 6px;
  height: 20px;
  background: var(--color-phosphor);
  opacity: 0.45;
  transform: skewY(-24deg);
}

.btn:hover {
  transform: translateY(-2px);
  background: linear-gradient(120deg, #d1ff5b, var(--color-phosphor));
  box-shadow: 0 12px 28px rgba(182, 255, 42, 0.15);
}

.btn-ghost {
  background: transparent;
  color: var(--color-phosphor);
  border-color: rgba(182, 255, 42, 0.4);
}

.btn-ghost::after {
  background: var(--color-volt);
  opacity: 0.6;
}

.btn-ghost:hover {
  background: rgba(182, 255, 42, 0.06);
  color: var(--color-phosphor);
  box-shadow: none;
}

.chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-dim);
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  transition: background 0.25s, color 0.25s, border-color 0.25s;
}

.chip:hover {
  border-color: var(--color-volt);
  color: var(--color-paper);
}

.chip[aria-pressed="true"] {
  background: var(--color-phosphor);
  color: var(--color-void);
  border-color: var(--color-phosphor);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.data-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  color: var(--color-phosphor);
}

.data-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-stream);
  background: rgba(122, 90, 248, 0.12);
  border-left: 2px solid var(--color-volt);
}

.panel-layer {
  position: relative;
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  padding: clamp(24px, 5vw, 56px);
}

.panel-layer::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(44, 53, 67, 0.4);
  pointer-events: none;
}

.skew-panel {
  clip-path: polygon(0 0, 100% 8%, 100% 100%, 0 92%);
  background: var(--color-panel);
  padding-block: var(--space-section);
}

.text-body {
  max-width: 72ch;
}

.text-body h2 {
  font-family: var(--font-head);
  font-size: 24px;
  font-weight: 900;
  margin: 1.8em 0 0.6em;
  color: var(--color-phosphor);
}

.text-body p {
  margin-bottom: 1em;
}

.text-body ul,
.text-body ol {
  margin: 0 0 1.2em 1.2em;
  padding-left: 1em;
}

.text-body ul {
  list-style: square;
}

.text-body ul li {
  margin-bottom: 0.4em;
}

.text-body strong {
  color: var(--color-phosphor);
}

.reveal[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s ease, transform 0.65s ease;
  will-change: opacity, transform;
}

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

.filter-item.is-hidden {
  display: none;
}

/* ---------- 6. Tree Path ---------- */
.tree-path {
  position: relative;
  padding-left: 36px;
}

.tree-path::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-phosphor), var(--color-volt));
  opacity: 0.55;
}

.tree-node {
  position: relative;
  margin-bottom: 26px;
}

.tree-node::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--color-void);
  border: 2px solid var(--color-phosphor);
}

.tree-node-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-paper);
  transition: color 0.25s;
}

.tree-node-btn:hover {
  color: var(--color-phosphor);
}

.tree-node-btn::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-volt);
}

.tree-node.is-open > .tree-node-btn::after {
  content: "–";
}

.tree-children {
  display: none;
  margin-top: 12px;
  padding-left: 20px;
  border-left: 1px dashed var(--color-line);
}

.tree-node.is-open > .tree-children {
  display: block;
}

.tree-children p {
  margin-bottom: 0.6em;
  font-size: 14px;
  color: var(--color-dim);
}

/* ---------- 7. Site Header ---------- */
.site-header {
  position: relative;
  z-index: var(--header-z);
  background: linear-gradient(180deg, rgba(10, 14, 20, 0.94), var(--color-void));
  border-bottom: 1px solid var(--color-line);
}

.header-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  z-index: calc(var(--fixed-z) + 2);
  background: linear-gradient(90deg, var(--color-phosphor), var(--color-volt), var(--color-arc));
  pointer-events: none;
}

.header-shell {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: 24px;
}

.header-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-block: 10px;
  font-size: 13px;
  color: var(--color-dim);
  border-bottom: 1px solid rgba(44, 53, 67, 0.6);
}

.header-tagline {
  letter-spacing: 0.1em;
}

.header-version {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-phosphor);
  letter-spacing: 0.04em;
}

.header-version::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-phosphor);
  box-shadow: 0 0 10px var(--color-phosphor);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.header-masthead {
  position: relative;
  display: grid;
  place-items: center;
  padding: 20px 24px 16px;
  text-align: center;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: var(--color-paper);
}

.brand-glyph {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  font-size: 28px;
  font-weight: 900;
  color: var(--color-void);
  background: linear-gradient(135deg, var(--color-phosphor), var(--color-volt));
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 100%, 12px 100%);
}

.brand-lines {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  text-align: left;
}

.brand-cn {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(28px, 4.5vw, 48px);
  letter-spacing: 0.1em;
  color: var(--color-paper);
  white-space: nowrap;
}

.brand-sub {
  font-style: normal;
  font-size: 11px;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--color-dim);
  border-top: 1px solid var(--color-line);
  padding-top: 4px;
}

.nav-toggle {
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  display: none;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  color: var(--color-paper);
  border: 1px solid var(--color-line);
  background: var(--color-panel);
}

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

.nav-toggle-box {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 24px;
}

.nav-toggle-bar {
  height: 2px;
  width: 100%;
  background: var(--color-phosphor);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle-text {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav {
  position: relative;
  border-top: 1px solid var(--color-line);
  background: rgba(10, 14, 20, 0.75);
}

.nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(16px, 3.2vw, 42px);
}

.nav-link {
  display: block;
  padding: 14px 4px 12px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-paper);
  position: relative;
  letter-spacing: 0.02em;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 6px;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-phosphor), var(--color-volt));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

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

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

/* ---------- 8. Site Footer ---------- */
.site-footer {
  position: relative;
  margin-top: 80px;
  padding-top: 64px;
  background: linear-gradient(180deg, var(--color-void), #06090d);
  border-top: 1px solid var(--color-line);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(115deg, transparent 0 46px, rgba(255, 255, 255, 0.015) 46px 47px);
  pointer-events: none;
}

.footer-skyline {
  position: relative;
  height: 8px;
  margin-bottom: 40px;
  background: linear-gradient(90deg, var(--color-phosphor) 0%, var(--color-volt) 55%, var(--color-arc) 100%);
  transform: skewY(-1.2deg);
  transform-origin: left;
  opacity: 0.55;
}

.footer-shell {
  position: relative;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: 24px;
}

.footer-cols {
  display: grid;
  grid-template-columns: 5fr 2fr 2fr 4fr;
  gap: 44px;
  padding-bottom: 48px;
}

.footer-primary {
  padding-right: 16px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 28px;
  letter-spacing: 0.1em;
  color: var(--color-paper);
}

.footer-brand-glyph {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  font-size: 18px;
  font-weight: 900;
  color: var(--color-void);
  background: linear-gradient(135deg, var(--color-phosphor), var(--color-volt));
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 100%, 8px 100%);
}

.footer-brand-x {
  margin-top: 4px;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--color-dim);
}

.footer-trust {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-dim);
  max-width: 380px;
}

.footer-nav,
.footer-policy,
.footer-contact {
  display: flex;
  flex-direction: column;
}

.footer-heading {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-phosphor);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-line);
}

.footer-list li {
  margin-bottom: 8px;
}

.footer-list a {
  color: var(--color-dim);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 0.25s, border-color 0.25s;
}

.footer-list a:hover {
  color: var(--color-phosphor);
  border-bottom-color: var(--color-phosphor);
}

.footer-version {
  margin-top: 24px;
  padding: 12px 16px;
  background: rgba(182, 255, 42, 0.07);
  border-left: 3px solid var(--color-phosphor);
}

.version-label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--color-dim);
}

.version-number {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1.4;
  color: var(--color-phosphor);
}

.footer-contact-list {
  margin-bottom: 14px;
}

.footer-contact-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--color-line);
  font-size: 14px;
  color: var(--color-paper);
}

.footer-contact-list li > span:last-child {
  flex: 1;
}

.contact-label {
  flex: 0 0 42px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--color-dim);
}

.contact-note {
  font-size: 12px;
  line-height: 1.7;
  color: var(--color-dim);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 20px 0;
  border-top: 1px solid var(--color-line);
  font-size: 13px;
  color: var(--color-dim);
}

.to-top-btn {
  position: fixed;
  right: 20px;
  bottom: 28px;
  z-index: 200;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  background: var(--color-panel);
  color: var(--color-phosphor);
  border: 1px solid var(--color-line);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease, background 0.3s ease, color 0.3s ease;
}

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

.to-top-btn:hover {
  background: var(--color-phosphor);
  color: var(--color-void);
  border-color: var(--color-phosphor);
}

/* ---------- 9. Responsive ---------- */
@media (max-width: 960px) {
  .footer-cols {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }

  .footer-primary {
    grid-column: 1 / -1;
    padding-right: 0;
  }

  .grid-cols-3 {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .grid-cols-2 {
    grid-template-columns: 1fr;
  }

  .grid-cols-3 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  .header-topbar {
    justify-content: center;
  }

  .header-tagline {
    display: none;
  }

  .header-masthead {
    justify-content: flex-start;
    padding: 16px;
  }

  .brand-glyph {
    width: 44px;
    height: 44px;
    font-size: 22px;
  }

  .brand-cn {
    font-size: 24px;
    letter-spacing: 0.08em;
  }

  .brand-sub {
    font-size: 10px;
    letter-spacing: 0.28em;
  }

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

  .site-nav {
    display: none;
    border-top: 1px solid var(--color-line);
  }

  .site-nav[data-open] {
    display: block;
    animation: nav-open 0.3s ease;
  }

  @keyframes nav-open {
    from {
      opacity: 0;
      transform: translateY(-8px);
    }
    to {
      opacity: 1;
      transform: none;
    }
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 16px 20px;
  }

  .nav-link {
    padding: 12px 4px;
    font-size: 16px;
    border-bottom: 1px solid var(--color-line);
  }

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

  .nav-link[aria-current="page"] {
    color: var(--color-phosphor);
    background: linear-gradient(90deg, rgba(182, 255, 42, 0.08), transparent);
    padding-left: 10px;
  }
}

@media (max-width: 580px) {
  .footer-cols {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-primary {
    grid-column: auto;
  }

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

  .to-top-btn {
    right: 14px;
    bottom: 18px;
  }
}

/* ---------- 10. Reduced Motion ---------- */
@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;
  }

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

  .to-top-btn {
    transition: none;
  }
}