/* =========================================================
   新普京游戏 — 共享站点样式 /assets/site.css
   01 变量与重置  02 基础排版  03 通用组件
   04 头部  05 页脚  06 动效与响应式
   ========================================================= */

/* ---------- 01 变量与重置 ---------- */
:root {
  --ink: #07090C;
  --panel: #0E1218;
  --graphite: #1A2029;
  --silver: #A7B0BC;
  --white: #E8EDF3;
  --cyan: #22E3D2;
  --amber: #FFB347;
  --deep-cyan: #0E5C57;
  --coral: #FF6B5A;
  --glass: rgba(232, 237, 243, 0.08);
  --line: rgba(232, 237, 243, 0.10);

  --shell: 1240px;
  --gutter: clamp(20px, 5vw, 64px);
  --radius-s: 8px;
  --radius-m: 12px;
  --radius-pill: 999px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Noto Sans SC", "Source Han Sans SC", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
}

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, figure, blockquote, dl, dd { margin: 0; }

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

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

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

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

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

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 02 基础排版 ---------- */
body {
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--ink);
  background-image:
    radial-gradient(1100px 620px at 16% -12%, rgba(34, 227, 210, 0.085), transparent 62%),
    radial-gradient(880px 520px at 108% 18%, rgba(255, 179, 71, 0.055), transparent 60%),
    linear-gradient(to right, rgba(232, 237, 243, 0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(232, 237, 243, 0.045) 1px, transparent 1px);
  background-size: auto, auto, 72px 72px, 72px 72px;
  background-position: center top;
  background-attachment: scroll, scroll, scroll, scroll;
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--white);
}

h1 { font-size: clamp(38px, 6vw, 76px); }
h2 { font-size: clamp(28px, 3.6vw, 48px); }
h3 { font-size: clamp(21px, 2.2vw, 28px); }
h4 { font-size: clamp(17px, 1.6vw, 20px); }

.num,
.mono,
time,
.version {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

#main-content {
  display: block;
  padding-top: clamp(96px, 13vh, 148px);
}

.prose p { max-width: 68ch; }
.prose p + p { margin-top: 1.2em; }
.prose :is(h2, h3) { margin-top: 1.6em; }

/* ---------- 03 通用组件 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: clamp(64px, 9vw, 112px);
  border-top: 1px solid var(--line);
}
.section--band-cyan { border-top: 1px solid var(--cyan); }
.section--band-amber { border-top: 1px solid var(--amber); }

.section__head {
  display: grid;
  gap: 16px;
  max-width: 820px;
  margin-bottom: clamp(32px, 4vw, 56px);
}

.section__index {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.section__lead {
  color: var(--silver);
  font-size: clamp(16px, 1.5vw, 18px);
  max-width: 62ch;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  transition: background 0.24s var(--ease), color 0.24s ease,
    border-color 0.24s ease, transform 0.24s var(--ease),
    box-shadow 0.24s var(--ease);
}
.btn--primary {
  background: var(--cyan);
  color: var(--ink);
}
.btn--primary:hover {
  background: var(--deep-cyan);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: 0 0 0 2px rgba(34, 227, 210, 0.4);
}
.btn--ghost {
  border-color: var(--graphite);
  color: var(--white);
}
.btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-2px);
  box-shadow: 0 0 0 2px rgba(34, 227, 210, 0.22);
}
.btn--amber {
  border-color: var(--amber);
  color: var(--amber);
}
.btn--amber:hover {
  background: var(--amber);
  color: var(--ink);
  transform: translateY(-2px);
  box-shadow: 0 0 0 2px rgba(255, 179, 71, 0.3);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--graphite);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--silver);
}
.tag--cyan {
  color: var(--cyan);
  border-color: rgba(34, 227, 210, 0.4);
  background: rgba(34, 227, 210, 0.08);
}
.tag--amber {
  color: var(--amber);
  border-color: rgba(255, 179, 71, 0.4);
  background: rgba(255, 179, 71, 0.08);
}
.tag--coral {
  color: var(--coral);
  border-color: rgba(255, 107, 90, 0.4);
  background: rgba(255, 107, 90, 0.08);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--graphite);
  border-radius: var(--radius-s);
  padding: clamp(20px, 3vw, 32px);
}
.panel--glass {
  background: var(--glass);
  border-color: var(--line);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--silver);
}
.breadcrumbs a { color: var(--silver); }
.breadcrumbs a:hover { color: var(--cyan); }
.breadcrumbs__sep { color: var(--graphite); }

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.figure {
  display: grid;
  gap: 10px;
}
.figure__frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius-s);
  border: 1px solid var(--graphite);
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(34, 227, 210, 0.14), transparent 58%),
    radial-gradient(90% 80% at 100% 100%, rgba(255, 179, 71, 0.10), transparent 60%),
    repeating-linear-gradient(0deg, rgba(232, 237, 243, 0.055) 0 1px, transparent 1px 24px),
    repeating-linear-gradient(90deg, rgba(232, 237, 243, 0.055) 0 1px, transparent 1px 24px),
    var(--panel);
}
.figure__frame--wide { aspect-ratio: 21 / 9; }
.figure__frame--tall { aspect-ratio: 3 / 4; }
.figure__frame :is(img, svg) {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.figure__caption {
  font-size: 13px;
  line-height: 1.7;
  color: var(--silver);
}

.accordion {
  border: 1px solid var(--graphite);
  border-radius: var(--radius-s);
  overflow: hidden;
  background: var(--panel);
}
.accordion__item + .accordion__item { border-top: 1px solid var(--graphite); }
.accordion__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  text-align: left;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  transition: color 0.2s ease, background 0.2s ease;
}
.accordion__trigger:hover { color: var(--cyan); background: var(--glass); }
.accordion__icon {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(45deg);
  transition: transform 0.26s var(--ease);
}
.accordion__trigger[aria-expanded="true"] { color: var(--cyan); }
.accordion__trigger[aria-expanded="true"] .accordion__icon {
  transform: rotate(-135deg);
}
.accordion__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.26s var(--ease);
}
.accordion__item[data-open] .accordion__panel { grid-template-rows: 1fr; }
.accordion__panel > div {
  overflow: hidden;
  padding-inline: 22px;
  color: var(--silver);
  font-size: 15px;
}
.accordion__item[data-open] .accordion__panel > div { padding-bottom: 20px; }

/* ---------- 04 头部 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  pointer-events: auto;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--cyan);
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  transform: translateY(-180%);
  transition: transform 0.24s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: none;
  box-shadow: 0 0 0 2px var(--ink), 0 0 0 4px var(--cyan);
}

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  padding: 18px clamp(12px, 3vw, 28px) 0;
  pointer-events: none;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 130;
  background: rgba(232, 237, 243, 0.06);
  pointer-events: none;
}
.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  transition: width 0.12s linear;
}

.header-shell {
  position: relative;
  pointer-events: auto;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(10px, 2vw, 24px);
  max-width: var(--shell);
  margin-inline: auto;
  padding: 10px 14px 10px 20px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--graphite);
  background: rgba(14, 18, 24, 0.72);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  transition: padding 0.3s var(--ease), background 0.3s ease,
    border-color 0.3s ease, box-shadow 0.3s ease;
}
.site-header.is-compact .header-shell {
  padding-top: 6px;
  padding-bottom: 6px;
  background: rgba(7, 9, 12, 0.91);
  border-color: rgba(232, 237, 243, 0.14);
  box-shadow: 0 14px 44px rgba(0, 0, 0, 0.5);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
  transition: opacity 0.2s ease;
}
.brand:hover { opacity: 0.82; }
.brand-dot {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(34, 227, 210, 0.14),
    0 0 14px rgba(34, 227, 210, 0.9);
}
.brand-name {
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--white);
}

.site-nav { justify-self: center; min-width: 0; }

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}
.nav-list a {
  position: relative;
  display: inline-block;
  padding: 8px 12px 8px 16px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  color: var(--silver);
  transition: color 0.2s ease, background 0.2s ease;
}
.nav-list a::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 50%;
  width: 3px;
  height: 14px;
  border-radius: 2px;
  background: var(--cyan);
  transform: translateY(-50%) scaleY(0);
  transition: transform 0.24s var(--ease);
}
.nav-list a:hover {
  color: var(--white);
  background: var(--glass);
}
.nav-list a[aria-current="page"] {
  color: var(--white);
  background: var(--glass);
}
.nav-list a[aria-current="page"]::before {
  transform: translateY(-50%) scaleY(1);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--graphite);
  color: var(--white);
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.nav-toggle[aria-expanded="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: background 0.2s ease;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.26s var(--ease), top 0.26s var(--ease);
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  top: 0;
  transform: rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  top: 0;
  transform: rotate(-45deg);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 20px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--amber);
  color: var(--amber);
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
  transition: background 0.24s var(--ease), color 0.24s ease,
    transform 0.24s var(--ease), box-shadow 0.24s var(--ease);
}
.header-cta:hover {
  background: var(--amber);
  color: var(--ink);
  transform: translateY(-2px);
  box-shadow: 0 0 0 2px rgba(255, 179, 71, 0.32), 0 0 22px rgba(255, 179, 71, 0.3);
}

/* ---------- 05 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 8vw, 120px);
  padding-block: clamp(56px, 7vw, 88px) 0;
  border-top: 1px solid var(--graphite);
  background: linear-gradient(180deg, rgba(14, 18, 24, 0.92), var(--ink) 62%);
}
.footer-shell {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.9fr 1.4fr 0.9fr;
  gap: clamp(24px, 4vw, 56px);
}
.footer-col { min-width: 0; }
.footer-col--brand { display: grid; align-content: start; gap: 18px; }

.brand--footer .brand-name { font-size: 18px; }
.brand--footer .brand-dot {
  box-shadow: 0 0 0 5px rgba(34, 227, 210, 0.12),
    0 0 18px rgba(34, 227, 210, 0.85);
}

.footer-tagline {
  font-size: 15px;
  line-height: 1.7;
  color: var(--silver);
  max-width: 26ch;
}

.footer-title {
  margin-bottom: 16px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  line-height: 1.4;
  color: var(--silver);
}

.footer-links {
  display: grid;
  gap: 10px;
}
.footer-links a {
  display: inline-block;
  font-size: 15px;
  color: var(--white);
  transition: color 0.2s ease, transform 0.2s ease;
}
.footer-links a:hover {
  color: var(--cyan);
  transform: translateX(2px);
}

.footer-contact-list {
  display: grid;
  gap: 8px;
}
.footer-contact {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--graphite);
  border-radius: var(--radius-s);
  background: rgba(232, 237, 243, 0.03);
}
.footer-contact--plain {
  justify-content: flex-start;
  border-color: transparent;
  background: none;
  padding-inline: 0;
}
.footer-contact__value {
  font-size: 14px;
  line-height: 1.5;
  color: var(--white);
  overflow-wrap: anywhere;
}
.footer-contact__value--mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}
.copy-btn {
  flex: 0 0 auto;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--graphite);
  font-size: 12px;
  line-height: 1.4;
  color: var(--silver);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.copy-btn:hover {
  color: var(--cyan);
  border-color: rgba(34, 227, 210, 0.5);
  background: rgba(34, 227, 210, 0.08);
}
.copy-btn[data-copied="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}
.copy-btn[data-copied="false"] {
  color: var(--coral);
  border-color: rgba(255, 107, 90, 0.5);
}

.footer-note {
  margin-top: 14px;
  max-width: 34ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--silver);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px 24px;
  margin-top: clamp(40px, 5vw, 64px);
  padding-block: 22px;
  border-top: 1px solid var(--graphite);
  font-size: 13px;
  color: var(--silver);
  text-align: center;
}
.footer-base__item { letter-spacing: 0.02em; }

/* ---------- 06 动效与响应式 ---------- */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.42s var(--ease), transform 0.42s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
.has-js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: 1.2fr 1fr 1.3fr; }
  .footer-grid > .footer-col:nth-child(4) { grid-column: 2 / 3; }
  .footer-grid > .footer-col--brand { grid-row: span 2; }
}

@media (max-width: 980px) {
  .site-header { padding: 12px 12px 0; }

  .header-shell {
    grid-template-columns: 1fr auto;
    gap: 10px;
    padding: 8px 10px 8px 18px;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: rgba(10, 13, 18, 0.94);
  }

  .header-cta { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    left: 12px;
    right: 12px;
    bottom: calc(12px + env(safe-area-inset-bottom, 0px));
    z-index: 110;
    padding: 12px;
    border-radius: 22px;
    border: 1px solid var(--graphite);
    background: rgba(10, 13, 18, 0.97);
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.65);
    opacity: 0;
    visibility: hidden;
    transform: translateY(calc(100% + 32px));
    transition: transform 0.34s var(--ease), opacity 0.22s ease,
      visibility 0.34s;
  }
  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }
  .nav-list a {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 52px;
    padding: 12px 14px;
    border-radius: var(--radius-m);
    border: 1px solid var(--graphite);
    background: var(--panel);
    font-size: 15px;
    color: var(--white);
  }
  .nav-list a::before {
    position: static;
    transform: none;
    flex: 0 0 auto;
    width: 8px;
    height: 8px;
    border-radius: 2px;
    background: var(--silver);
    opacity: 0.6;
  }
  .nav-list a:hover {
    border-color: rgba(34, 227, 210, 0.35);
    color: var(--cyan);
    background: var(--panel);
  }
  .nav-list a[aria-current="page"] {
    border-color: rgba(34, 227, 210, 0.55);
    background: rgba(34, 227, 210, 0.10);
    color: var(--cyan);
  }
  .nav-list a[aria-current="page"]::before {
    background: var(--cyan);
    opacity: 1;
    transform: none;
  }

  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid > .footer-col:nth-child(4) { grid-column: auto; }
  .footer-grid > .footer-col--brand {
    grid-column: 1 / -1;
    grid-row: auto;
  }
  .footer-tagline { max-width: 40ch; }

  .grid--2,
  .grid--3 { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }

  .footer-grid { grid-template-columns: 1fr; }
  .footer-note { max-width: none; }
  .footer-base {
    flex-direction: column;
    gap: 6px;
    padding-bottom: calc(24px + env(safe-area-inset-bottom, 0px));
  }
  .site-footer { padding-bottom: 0; }
}

@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;
  }
  .has-js [data-reveal] {
    opacity: 1;
    transform: none;
  }
  .site-nav,
  .site-nav[data-open] { transition: none; }
}