/* ==========================================================
   QY 千亿球友会｜全站共享样式 /assets/site.css
   视觉系统：深空档案夹 Starfield Archive
   ========================================================== */

/* ---------- 1. CSS 变量 ---------- */
:root {
  --color-primary: #0B1B3B;
  --color-primary-deep: #071126;
  --color-accent: #E8B64C;
  --color-accent-light: #F0D48A;
  --color-secondary: #5A4FCF;
  --color-indigo: #2E3A6E;
  --color-text-light: #F4F6FB;
  --color-text-dark: #1A2A44;
  --color-bg-light: #EFF2F7;
  --color-success: #3DC9B0;
  --color-border: #D4AF6A;

  --font-title: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "Source Serif Pro", "Songti SC", "SimSun", Georgia, serif;

  --header-h: 72px;
  --content-max: 1280px;
  --shadow: 0 8px 28px rgba(0, 0, 0, 0.32);
  --ease: 0.25s ease;
}

/* ---------- 2. Reset 与基础 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  padding-top: var(--header-h);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-dark);
  background: var(--color-bg-light);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.6em;
  font-family: var(--font-title);
  font-weight: 900;
  line-height: 1.25;
  color: var(--color-text-dark);
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

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

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

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

[hidden] {
  display: none !important;
}

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

::selection {
  background: rgba(232, 182, 76, 0.8);
  color: var(--color-primary);
}

#main-content {
  display: block;
  scroll-margin-top: calc(var(--header-h) + 8px);
}

/* ---------- 3. 内容容器与网格 ---------- */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 32px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 24px;
}

.col-span-2 { grid-column: span 2; }
.col-span-3 { grid-column: span 3; }
.col-span-4 { grid-column: span 4; }
.col-span-5 { grid-column: span 5; }
.col-span-6 { grid-column: span 6; }
.col-span-7 { grid-column: span 7; }
.col-span-8 { grid-column: span 8; }
.col-span-9 { grid-column: span 9; }
.col-span-12 { grid-column: span 12; }

/* ---------- 4. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 0;
  margin: 0 0 32px;
  padding: 0;
  list-style: none;
  font-family: var(--font-title);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.breadcrumbs li {
  display: flex;
  align-items: center;
}

.breadcrumbs li + li::before {
  content: "/";
  margin: 0 10px;
  color: rgba(212, 175, 106, 0.7);
}

.breadcrumbs a {
  color: rgba(244, 246, 251, 0.6);
  text-decoration: none;
}

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

.breadcrumbs [aria-current="page"] {
  color: var(--color-accent);
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-family: var(--font-title);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  background: var(--color-accent);
  border: 1px solid var(--color-accent);
  text-decoration: none;
  transition: background var(--ease), color var(--ease), box-shadow var(--ease), transform var(--ease);
}

.btn:hover {
  background: transparent;
  color: var(--color-accent);
  box-shadow: inset 0 0 0 1px var(--color-accent);
  transform: translateY(-2px);
}

.btn--ghost {
  background: transparent;
  color: var(--color-accent);
}

.btn--ghost:hover {
  background: var(--color-accent);
  color: var(--color-primary);
  box-shadow: 0 0 18px rgba(232, 182, 76, 0.3);
}

/* ---------- 6. 章节索引标签 ---------- */
.section-index {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-title);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.26em;
  color: var(--color-accent);
  text-transform: uppercase;
}

.section-index::before {
  content: "";
  width: 42px;
  height: 1px;
  background: var(--color-accent);
  flex-shrink: 0;
}

.section-index::after {
  content: "";
  width: 7px;
  height: 7px;
  background: var(--color-accent);
  transform: rotate(45deg);
  flex-shrink: 0;
}

/* ---------- 7. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid rgba(212, 175, 106, 0.35);
  background: linear-gradient(135deg, var(--color-indigo) 0%, var(--color-primary) 100%);
  min-height: 0;
}

.media-frame::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}

.media-frame > * {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 70%, rgba(7, 17, 38, 0.35));
  pointer-events: none;
}

.media-frame--portrait::before {
  padding-top: 75%;
}

.media-frame--wide::before {
  padding-top: 42%;
}

/* ---------- 8. 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
  display: inline-block;
  padding: 10px 20px;
  background: var(--color-accent);
  border: 1px solid var(--color-text-light);
  color: var(--color-primary);
  font-family: var(--font-title);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  transform: translateY(-120%);
  transition: transform var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
  outline: none;
}

/* ---------- 9. 站点头部 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: rgba(11, 27, 59, 0.94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(212, 175, 106, 0.26);
  font-family: var(--font-title);
  transition: box-shadow 0.3s ease;
}

.site-header.is-scrolled {
  box-shadow: var(--shadow);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(1px 1px at 12% 38%, rgba(244, 246, 251, 0.6) 50%, transparent 51%),
    radial-gradient(1px 1px at 26% 62%, rgba(232, 182, 76, 0.5) 50%, transparent 51%),
    radial-gradient(1px 1px at 58% 28%, rgba(244, 246, 251, 0.45) 50%, transparent 51%),
    radial-gradient(1px 1px at 74% 68%, rgba(244, 246, 251, 0.35) 50%, transparent 51%),
    radial-gradient(1px 1px at 92% 20%, rgba(232, 182, 76, 0.45) 50%, transparent 51%);
}

.site-header::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  z-index: 1;
  background: linear-gradient(90deg, var(--color-accent) 0%, rgba(232, 182, 76, 0.3) 55%, transparent 100%);
  pointer-events: none;
}

.header-progress {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-light) 50%, var(--color-secondary) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
  will-change: transform;
}

.header-inner {
  position: relative;
  z-index: 3;
  height: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  text-decoration: none;
}

.brand:hover {
  color: inherit;
}

.brand-mark {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.01em;
  color: var(--color-accent);
  border: 1px solid var(--color-border);
  background: rgba(232, 182, 76, 0.07);
  flex-shrink: 0;
}

.brand-mark::before {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  right: 3px;
  bottom: 3px;
  border: 1px solid rgba(212, 175, 106, 0.25);
  pointer-events: none;
}

.brand-mark::after {
  content: "";
  position: absolute;
  right: -3px;
  bottom: -3px;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
}

.brand-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  line-height: 1.2;
}

.brand-name {
  font-size: 18px;
  font-weight: 900;
  letter-spacing: 0.12em;
  color: var(--color-text-light);
  white-space: nowrap;
}

.brand-slogan {
  margin-top: 3px;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.32em;
  color: rgba(244, 246, 251, 0.5);
  white-space: nowrap;
}

.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-item {
  position: relative;
}

.nav-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 10px 10px 12px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: rgba(244, 246, 251, 0.82);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--ease);
}

.nav-index {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--color-border);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 4px;
  height: 1px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform 0.28s ease;
}

.nav-link:hover {
  color: var(--color-text-light);
}

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

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

.nav-cta {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  border: 1px solid var(--color-border);
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--ease), color var(--ease), box-shadow var(--ease);
}

.nav-cta::before {
  content: "";
  position: absolute;
  inset: 3px;
  border: 1px solid rgba(212, 175, 106, 0.3);
  pointer-events: none;
  transition: border-color var(--ease);
}

.nav-cta:hover {
  background: var(--color-accent);
  color: var(--color-primary);
  box-shadow: 0 0 20px rgba(232, 182, 76, 0.3);
}

.nav-cta:hover::before {
  border-color: transparent;
}

.cta-arrow {
  font-size: 15px;
  line-height: 1;
  transition: transform var(--ease);
}

.nav-cta:hover .cta-arrow {
  transform: translateX(3px);
}

.nav-toggle {
  display: none;
  margin-left: auto;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 6px 8px;
  color: var(--color-text-light);
}

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

.nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-accent);
  transition: transform 0.28s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(3.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) {
  transform: translateY(-3.5px) rotate(-45deg);
}

.nav-toggle-label {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.22em;
  color: rgba(244, 246, 251, 0.56);
}

/* ---------- 10. 站点页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(1px 1px at 18% 22%, rgba(244, 246, 251, 0.5) 50%, transparent 51%),
    radial-gradient(1px 1px at 72% 48%, rgba(232, 182, 76, 0.4) 50%, transparent 51%),
    radial-gradient(1px 1px at 42% 82%, rgba(244, 246, 251, 0.35) 50%, transparent 51%),
    radial-gradient(1px 1px at 88% 18%, rgba(244, 246, 251, 0.4) 50%, transparent 51%),
    radial-gradient(1px 1px at 30% 55%, rgba(90, 79, 207, 0.4) 50%, transparent 51%),
    linear-gradient(180deg, #081327 0%, var(--color-primary-deep) 100%);
  border-top: 1px solid var(--color-border);
  color: rgba(244, 246, 251, 0.74);
  font-family: var(--font-title);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--color-border), rgba(212, 175, 106, 0) 30%, rgba(212, 175, 106, 0) 70%, var(--color-border));
  pointer-events: none;
}

.footer-inner {
  position: relative;
  z-index: 1;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 64px 32px 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 2.1fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.25fr);
  gap: 44px;
  padding-bottom: 44px;
  border-bottom: 1px solid rgba(212, 175, 106, 0.18);
}

.footer-brand-block {
  min-width: 0;
}

.brand-footer {
  margin-bottom: 18px;
}

.footer-trust {
  margin-bottom: 16px;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.85;
  color: rgba(244, 246, 251, 0.62);
  max-width: 40em;
}

.footer-note {
  margin: 16px 0 0;
  padding-left: 12px;
  border-left: 1px solid rgba(212, 175, 106, 0.35);
  font-size: 12px;
  line-height: 1.7;
  color: rgba(244, 246, 251, 0.46);
}

.footer-col {
  min-width: 0;
}

.footer-heading {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.24em;
  color: var(--color-accent);
  text-transform: uppercase;
}

.footer-heading::after {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--color-border);
  opacity: 0.5;
}

.footer-links li + li {
  margin-top: 10px;
}

.footer-links a {
  position: relative;
  display: inline-block;
  padding: 2px 0;
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: rgba(244, 246, 251, 0.72);
  text-decoration: none;
  transition: color var(--ease), padding-left var(--ease);
}

.footer-links a::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform var(--ease);
}

.footer-links a:hover {
  color: var(--color-accent);
  padding-left: 4px;
}

.footer-links a:hover::before {
  transform: scaleX(1);
  transform-origin: left center;
}

.footer-contact-list {
  display: grid;
  gap: 10px;
}

.footer-contact-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(244, 246, 251, 0.72);
  font-family: var(--font-body);
}

.footer-contact-label {
  flex-shrink: 0;
  padding-top: 3px;
  min-width: 2.5em;
  font-family: var(--font-title);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: rgba(232, 182, 76, 0.75);
}

.footer-contact-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 18px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 2px;
  transition: color var(--ease), border-color var(--ease);
}

.footer-contact-link:hover {
  color: var(--color-text-light);
  border-color: var(--color-text-light);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-top: 22px;
}

.footer-copyright {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(244, 246, 251, 0.5);
}

.footer-sync {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(61, 201, 176, 0.85);
}

.footer-sync-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 8px rgba(61, 201, 176, 0.6);
  animation: sync-pulse 2.4s ease-in-out infinite;
}

@keyframes sync-pulse {
  0%, 100% {
    opacity: 1;
    box-shadow: 0 0 8px rgba(61, 201, 176, 0.6);
  }
  50% {
    opacity: 0.5;
    box-shadow: 0 0 2px rgba(61, 201, 176, 0.25);
  }
}

/* ---------- 11. 返回顶部 ---------- */
.back-to-top {
  position: fixed;
  right: 28px;
  bottom: 32px;
  z-index: 990;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: rgba(11, 27, 59, 0.92);
  color: var(--color-accent);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.28);
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease, background var(--ease), color var(--ease);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-accent);
  color: var(--color-primary);
  box-shadow: 0 0 24px rgba(232, 182, 76, 0.4);
}

.back-to-top-icon {
  font-size: 18px;
  line-height: 1;
}

/* ---------- 12. 响应式 ---------- */
@media (max-width: 1023px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 991px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 16px 0 20px;
    margin-left: 0;
    background: rgba(7, 17, 38, 0.98);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }

  .site-nav[data-open] {
    display: flex;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0 24px;
  }

  .nav-link {
    padding: 14px 8px;
    font-size: 15px;
    letter-spacing: 0.16em;
    border-bottom: 1px solid rgba(244, 246, 251, 0.08);
    justify-content: space-between;
  }

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

  .nav-cta {
    margin: 18px 24px 0;
    justify-content: center;
  }
}

@media (max-width: 767px) {
  .header-inner {
    padding: 0 20px;
    gap: 12px;
  }

  .brand-slogan {
    display: none;
  }

  .brand-name {
    font-size: 16px;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
    font-size: 14px;
  }

  .container {
    padding: 0 20px;
  }

  .grid {
    gap: 16px;
  }

  .col-span-2,
  .col-span-3,
  .col-span-4,
  .col-span-5,
  .col-span-6,
  .col-span-7,
  .col-span-8,
  .col-span-9,
  .col-span-12 {
    grid-column: span 12;
  }

  .footer-inner {
    padding: 48px 20px 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
    padding-bottom: 36px;
  }

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

  .back-to-top {
    right: 16px;
    bottom: 20px;
  }
}

/* ---------- 13. 无障碍：减少动态 ---------- */
@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;
    scroll-behavior: auto !important;
  }
}