/* ============================================================
   大嬴体育登录 · 共享样式 /assets/site.css
   框架式导航 + 堆叠面板 + 近单色靛蓝体系 + 精密网格
   ============================================================ */

:root {
  --ink-900: #0B1733;
  --ink-800: #0F1E3D;
  --ink-700: #14254F;
  --line: #24406F;
  --gold: #E7C873;
  --orange: #F27A2E;
  --red: #C94A3D;
  --amber: #D9A441;
  --white: #F4F6FA;
  --muted: #9AA9C4;
  --edge: #6E84AD;

  --rail-w: 244px;
  --rail-pad: clamp(18px, 2vw, 28px);
  --topbar-h: 72px;
  --gutter: clamp(18px, 4vw, 48px);
  --maxw: 1180px;

  --font-sans: "Noto Sans SC", "HarmonyOS Sans SC", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "Roboto Mono", "IBM Plex Mono", "SFMono-Regular", ui-monospace,
    "Cascadia Mono", Consolas, "Liberation Mono", monospace;

  --ease: cubic-bezier(.22, .68, .24, 1);
}

/* ---------- reset ---------- */

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

html {
  -webkit-text-size-adjust: 100%;
  background: #0B1733;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--ink-900);
  background-image:
    repeating-linear-gradient(90deg, rgba(36, 64, 111, .22) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(0deg, rgba(36, 64, 111, .14) 0 1px, transparent 1px 96px);
  background-attachment: fixed;
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

button {
  font-family: inherit;
}

a {
  color: var(--gold);
}

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

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 跳转链接 ---------- */

.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  transform: translateY(-130%);
  padding: 10px 20px;
  background: var(--gold);
  color: var(--ink-900);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  text-decoration: none;
  transition: transform .18s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--white);
  outline-offset: 2px;
}

/* ---------- 框架式页头 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
}

.topbar {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 26px);
  min-height: var(--topbar-h);
  padding: 0 var(--gutter);
  background: rgba(11, 23, 51, .94);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--white);
  flex: 0 0 auto;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
}

.brand-text {
  display: block;
}

.brand-name {
  display: block;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.25;
}

.brand-sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .24em;
  color: var(--edge);
  line-height: 1.6;
}

.topbar-note {
  display: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--muted);
  white-space: nowrap;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .18s var(--ease), border-color .18s var(--ease),
    color .18s var(--ease);
}

.btn:hover,
.btn:focus-visible {
  border-color: var(--gold);
  color: var(--gold);
}

.btn--ghost {
  border-color: rgba(231, 200, 115, .45);
  color: var(--gold);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: rgba(231, 200, 115, .1);
  border-color: var(--gold);
  color: var(--gold);
}

.btn--solid {
  border-color: var(--orange);
  background: var(--orange);
  color: #0B1733;
}

.btn--solid:hover,
.btn--solid:focus-visible {
  border-color: var(--gold);
  background: var(--gold);
  color: #0B1733;
}

.btn--block {
  display: flex;
  width: 100%;
}

/* ---------- 移动菜单按钮 ---------- */

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  margin-left: auto;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  color: var(--white);
  font-size: 13px;
  letter-spacing: .16em;
  cursor: pointer;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--gold);
  color: var(--gold);
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: background-color .2s var(--ease);
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: transform .22s var(--ease);
}

.nav-toggle-bars::before { top: -5px; }
.nav-toggle-bars::after { top: 5px; }

.site-header[data-open] .nav-toggle-bars {
  background: transparent;
}

.site-header[data-open] .nav-toggle-bars::before {
  transform: translateY(5px) rotate(45deg);
}

.site-header[data-open] .nav-toggle-bars::after {
  transform: translateY(-5px) rotate(-45deg);
}

.nav-toggle-text {
  font-family: var(--font-mono);
}

/* ---------- 阅读进度 ---------- */

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(36, 64, 111, .45);
  pointer-events: none;
}

.scroll-progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--orange), var(--gold));
  transition: width .12s linear;
}

/* ---------- 左侧框架导航 ---------- */

.rail-nav {
  position: fixed;
  top: var(--topbar-h);
  left: 0;
  bottom: 0;
  z-index: 55;
  display: flex;
  flex-direction: column;
  gap: 26px;
  width: var(--rail-w);
  padding: 30px var(--rail-pad) 24px;
  overflow-y: auto;
  border-right: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(20, 37, 79, .92) 0%, rgba(11, 23, 51, .98) 100%);
}

.rail-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .26em;
  color: var(--gold);
  text-transform: uppercase;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.nav-list a {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 4px 9px 0;
  border-bottom: 1px solid rgba(36, 64, 111, .55);
  color: var(--muted);
  font-size: 15px;
  letter-spacing: .02em;
  text-decoration: none;
  transition: color .18s var(--ease), background-color .18s var(--ease);
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--white);
  background: rgba(231, 200, 115, .06);
}

.nav-list a[aria-current="page"] {
  color: var(--white);
  font-weight: 700;
}

.nav-list a[aria-current="page"] .nav-index {
  color: var(--gold);
}

.nav-list a[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--rail-pad));
  top: 50%;
  transform: translateY(-50%);
  width: 2px;
  height: 18px;
  background: var(--gold);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .1em;
  color: var(--edge);
  min-width: 20px;
}

.nav-name {
  display: block;
}

.rail-foot {
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid rgba(36, 64, 111, .55);
}

.rail-note {
  margin-bottom: 12px;
  font-size: 12px;
  line-height: 1.75;
  color: var(--edge);
}

.rail-link {
  display: flex;
  width: max-content;
  margin-top: 10px;
  padding-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(231, 200, 115, .4);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.rail-link:hover,
.rail-link:focus-visible {
  color: var(--white);
  border-color: var(--white);
}

/* ---------- 桌面端：框架占位 ---------- */

@media (min-width: 1024px) {
  body {
    padding-left: var(--rail-w);
  }

  .topbar {
    margin-left: calc(-1 * var(--rail-w));
    width: calc(100% + var(--rail-w));
  }

  .topbar-note {
    display: block;
  }
}

/* ---------- 移动/平板：抽屉导航 ---------- */

@media (max-width: 1023px) {
  :root {
    --topbar-h: 58px;
  }

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

  .topbar-actions {
    margin-left: auto;
  }

  .topbar-actions .btn--ghost {
    display: none;
  }

  .rail-nav {
    position: fixed;
    top: var(--topbar-h);
    left: 0;
    right: 0;
    bottom: 0;
    width: auto;
    padding: 26px var(--gutter) 36px;
    border-right: 0;
    border-top: 1px solid var(--line);
    background: linear-gradient(180deg, rgba(11, 23, 51, .99) 0%, rgba(15, 30, 61, .99) 100%);
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
  }

  .site-header[data-open] .rail-nav {
    transform: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-list a {
    padding: 14px 0;
    font-size: 17px;
  }

  .nav-index {
    font-size: 11px;
    min-width: 28px;
  }

  .nav-list a[aria-current="page"]::before {
    left: calc(-1 * var(--gutter));
    height: 22px;
  }

  .rail-foot {
    padding-top: 22px;
  }

  .rail-note {
    font-size: 13px;
  }
}

@media (max-width: 900px) {
  .topbar-note {
    display: none;
  }
}

@media (max-width: 560px) {
  .topbar-actions {
    display: none;
  }

  .brand-sub {
    display: none;
  }
}

/* ---------- 页脚 ---------- */

.site-footer {
  margin-top: clamp(56px, 8vw, 112px);
  padding: clamp(36px, 5vw, 64px) var(--gutter) 26px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(20, 37, 79, .68) 0%, rgba(11, 23, 51, .98) 46%, #08122A 100%);
}

.footer-grid {
  display: grid;
  gap: clamp(24px, 3vw, 48px);
  grid-template-columns: minmax(230px, 1.4fr) repeat(3, minmax(150px, 1fr));
  max-width: var(--maxw);
  margin-inline: auto;
}

.footer-title {
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 300;
  letter-spacing: .04em;
  line-height: 1.3;
}

.footer-tagline {
  margin-top: 8px;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.8;
}

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  cursor: pointer;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.to-top:hover,
.to-top:focus-visible {
  color: var(--gold);
  border-color: var(--gold);
}

.footer-heading {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: .24em;
  color: var(--gold);
  text-transform: uppercase;
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.footer-links a {
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--gold);
}

.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.contact-list li {
  display: grid;
  gap: 2px;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .18em;
  color: var(--edge);
}

.contact-value {
  font-size: 14px;
  color: var(--white);
  line-height: 1.7;
  word-break: break-word;
}

.footer-note {
  margin-top: 14px;
  font-size: 12px;
  line-height: 1.8;
  color: var(--edge);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  max-width: var(--maxw);
  margin: clamp(30px, 4vw, 52px) auto 0;
  padding-top: 20px;
  border-top: 1px solid rgba(36, 64, 111, .7);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--edge);
}

@media (max-width: 1023px) {
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------- 内容容器与排版 ---------- */

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: clamp(30px, 5vw, 64px);
}

.display {
  font-size: clamp(2.4rem, 7.2vw, 6rem);
  font-weight: 200;
  line-height: .96;
  letter-spacing: -.02em;
  color: var(--white);
}

.headline {
  font-size: clamp(1.5rem, 2.6vw, 2.2rem);
  font-weight: 300;
  line-height: 1.28;
  letter-spacing: .01em;
  color: var(--white);
}

.lede {
  max-width: 38em;
  font-size: clamp(1rem, 1.2vw, 1.125rem);
  line-height: 1.9;
  color: var(--white);
}

.muted {
  color: var(--muted);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--gold);
  text-transform: uppercase;
}

.rule {
  height: 1px;
  margin: 0;
  border: 0;
  background: var(--line);
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--edge);
}

.breadcrumb a {
  color: var(--edge);
  text-decoration: none;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--gold);
}

.breadcrumb span[aria-current] {
  color: var(--gold);
}

/* ---------- 面板 ---------- */

.panel {
  position: relative;
  padding: clamp(20px, 3vw, 40px);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(20, 37, 79, .85) 0%, rgba(11, 23, 51, .62) 100%);
}

.panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 22px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

/* ---------- 横向数据带 ---------- */

.data-band {
  display: flex;
  flex-wrap: wrap;
  border: 1px solid var(--line);
  background: rgba(20, 37, 79, .82);
}

.data-band-item {
  flex: 1 1 176px;
  padding: 16px 20px;
  border-right: 1px solid var(--line);
}

.data-band-item:last-child {
  border-right: 0;
}

.data-band-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .18em;
  color: var(--edge);
}

.data-band-value {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 18px;
  color: var(--gold);
  line-height: 1.5;
}

/* ---------- 标签与语义标记 ---------- */

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-decoration: none;
  cursor: pointer;
  transition: color .18s var(--ease), border-color .18s var(--ease),
    background-color .18s var(--ease);
}

.chip:hover,
.chip:focus-visible {
  color: var(--white);
  border-color: var(--edge);
}

.chip.is-active,
.chip[aria-pressed="true"] {
  color: var(--gold);
  border-color: var(--gold);
  background: rgba(231, 200, 115, .08);
}

.card-mark {
  display: inline-block;
  width: 8px;
  height: 12px;
  border-radius: 0;
  vertical-align: -1px;
}

.card-mark--red {
  background: var(--red);
}

.card-mark--yellow {
  background: var(--amber);
}

/* ---------- 网格与节奏工具 ---------- */

.grid {
  display: grid;
  gap: clamp(14px, 2vw, 24px);
}

.grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.stack > * + * {
  margin-top: var(--stack-gap, 18px);
}

/* ---------- 图片容器基础规则 ---------- */

.media {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-700);
  aspect-ratio: 16 / 9;
}

.media > img,
.media > picture,
.media > picture > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media > img,
.media > picture > img {
  filter: saturate(.72) contrast(1.06);
  transition: transform .8s var(--ease);
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(120% 100% at 82% 6%, rgba(11, 23, 51, 0) 42%, rgba(11, 23, 51, .74) 100%),
    linear-gradient(180deg, rgba(20, 37, 79, .3) 0%, rgba(11, 23, 51, .52) 100%);
  box-shadow: inset 0 0 0 1px rgba(231, 200, 115, .14);
}

.media:hover > img,
.media:hover > picture > img {
  transform: scale(1.03);
}

.media--wide { aspect-ratio: 21 / 9; }
.media--board { aspect-ratio: 4 / 3; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }

.media--placeholder {
  background-color: var(--ink-700);
  background-image: repeating-linear-gradient(
    135deg,
    rgba(36, 64, 111, .55) 0 1px,
    transparent 1px 14px
  );
}

.media-tag {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 6px 12px;
  background: rgba(11, 23, 51, .9);
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .18em;
  color: var(--gold);
}

/* ---------- 章节显现 ---------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

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

/* ---------- 减弱动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

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

  .scroll-progress-bar {
    transition: none;
  }
}