/* ============================================================
   乐博主站 · /assets/site.css
   共享外壳：重置 / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   设计原型：夜间赛事控制台 · 模块化 Bento · 出手即主场
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root {
  /* 色板 */
  --ink: #070B1F;
  --navy-900: #0E1633;
  --navy-700: #182A63;
  --violet: #4A2BD9;
  --violet-500: #7A5CFF;
  --cyan: #22E6D0;
  --orange: #FF8A2B;
  --mist: #E9EDFF;
  --steel: #9AA6CC;
  --white: #F5F7FF;

  /* 字体 */
  --font-display: "Archivo Black", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: Inter, "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 六级字号阶梯 */
  --fs-1: 12px;
  --fs-2: 14px;
  --fs-3: 18px;
  --fs-4: 26px;
  --fs-5: 44px;
  --fs-6: 92px;

  /* 8px 基准间距 */
  --sp-1: 8px;
  --sp-2: 16px;
  --sp-3: 24px;
  --sp-4: 32px;
  --sp-5: 48px;
  --sp-6: 64px;
  --sp-7: 96px;
  --sp-8: 120px;

  /* 形状：有机色块 / 柔和轮廓 */
  --radius-s: 6px;
  --radius-m: 14px;
  --radius-l: 26px;
  --radius-pill: 999px;

  --shell: 1200px;
  --header-h: 64px;
  --line: 1px solid var(--navy-700);
}

@media (min-width: 1024px) {
  :root { --header-h: 76px; }
}

/* ---------- 2. 重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

html { scroll-padding-top: calc(var(--header-h) + 16px); }

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

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

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

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

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

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

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

/* ---------- 3. 中文排版与页面底色 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(880px 460px at 92% -8%, rgba(74, 43, 217, 0.36), transparent 68%),
    radial-gradient(720px 420px at -10% 12%, rgba(34, 230, 208, 0.13), transparent 66%),
    radial-gradient(560px 360px at 50% 108%, rgba(255, 138, 43, 0.10), transparent 70%);
  background-repeat: no-repeat;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--white);
  text-wrap: balance;
}

.display-xl {
  font-size: clamp(40px, 7vw, 92px);
  line-height: 1.02;
  letter-spacing: -0.03em;
}

.display-l {
  font-size: clamp(30px, 4.6vw, 56px);
  letter-spacing: -0.025em;
}

.display-m {
  font-size: clamp(26px, 4vw, 44px);
}

.heading-s {
  font-size: clamp(20px, 2.4vw, 26px);
  letter-spacing: -0.012em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--cyan);
  opacity: 0.75;
}

.lede {
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.75;
  color: var(--mist);
  max-width: 36ch;
}

.prose {
  max-width: 38em;
  color: var(--mist);
}

.prose p + p { margin-top: 1.1em; }

.prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(34, 230, 208, 0.4);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.prose a:hover {
  color: var(--white);
  border-bottom-color: var(--orange);
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

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

/* ---------- 4. 布局：容器 / 区块 / 栅格 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

@media (min-width: 768px) {
  .shell { padding-left: 32px; padding-right: 32px; }
}

.section { padding: var(--sp-7) 0; }
.section--tight { padding: var(--sp-6) 0; }

.section--band {
  background: var(--navy-900);
  border-top: var(--line);
  border-bottom: var(--line);
  padding: var(--sp-7) 0;
}

@media (min-width: 900px) {
  .section,
  .section--band { padding: var(--sp-8) 0; }
}

.grid {
  display: grid;
  gap: var(--sp-2);
}

.grid--bento {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--3,
.grid--4 {
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 640px) {
  .grid--bento { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .grid { gap: 20px; }
  .grid--bento { grid-template-columns: repeat(12, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

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

.stack-1 > * + * { margin-top: var(--sp-1); }
.stack-2 > * + * { margin-top: var(--sp-2); }
.stack-3 > * + * { margin-top: var(--sp-3); }
.stack-4 > * + * { margin-top: var(--sp-4); }

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--navy-700), rgba(24, 42, 99, 0));
}

/* ---------- 5. 基础组件：按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: var(--fs-2);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
  white-space: nowrap;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.btn--cta {
  background: var(--orange);
  color: #160704;
  box-shadow: 0 12px 28px -18px rgba(255, 138, 43, 0.9);
}

.btn--cta:hover {
  background: #FFA85B;
  transform: translateY(-1px);
}

.btn--primary {
  background: var(--violet);
  color: var(--white);
}

.btn--primary:hover { background: var(--violet-500); }

.btn--ghost {
  border-color: var(--navy-700);
  color: var(--mist);
}

.btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn--sm {
  padding: 9px 16px;
  font-size: 13px;
}

/* ---------- 6. 基础组件：卡片 / 编号章节 / 面包屑 ---------- */
.card {
  position: relative;
  padding: var(--sp-3);
  border: var(--line);
  border-radius: var(--radius-m);
  background:
    linear-gradient(160deg, rgba(24, 42, 99, 0.55), rgba(14, 22, 51, 0.92));
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(34, 230, 208, 0.55);
  box-shadow: 0 20px 42px -26px rgba(34, 230, 208, 0.5);
}

.clip-corner {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.chapter {
  display: grid;
  gap: 6px;
  margin-bottom: var(--sp-4);
}

.chapter-num {
  font-family: var(--font-mono);
  font-size: var(--fs-2);
  letter-spacing: 0.2em;
  color: var(--steel);
  transition: color 0.45s ease;
}

.chapter[data-revealed="true"] .chapter-num { color: var(--violet-500); }

.chapter-title {
  font-size: clamp(22px, 3vw, 34px);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.04em;
  color: var(--steel);
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--navy-700);
}

.breadcrumb a {
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.breadcrumb a:hover {
  color: var(--cyan);
  border-bottom-color: rgba(34, 230, 208, 0.5);
}

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

/* ---------- 7. 图片位基础规则 ---------- */
.figure {
  position: relative;
  display: block;
  overflow: hidden;
  border: var(--line);
  border-radius: var(--radius-m);
  background:
    linear-gradient(135deg, rgba(74, 43, 217, 0.38), rgba(7, 11, 31, 0.94) 58%),
    repeating-linear-gradient(115deg, rgba(24, 42, 99, 0.75) 0 2px, transparent 2px 22px);
}

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

.figure--21x9 { aspect-ratio: 21 / 9; }
.figure--16x9 { aspect-ratio: 16 / 9; }
.figure--1x1 { aspect-ratio: 1 / 1; }
.figure--4x5 { aspect-ratio: 4 / 5; }

.figure-cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
  background: linear-gradient(180deg, rgba(7, 11, 31, 0), rgba(7, 11, 31, 0.9));
}

/* ---------- 8. 跳过链接 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -72px;
  z-index: 140;
  padding: 10px 18px;
  border-radius: 0 0 var(--radius-s) var(--radius-s);
  background: var(--cyan);
  color: #042420;
  font-size: var(--fs-2);
  font-weight: 700;
  transition: top 0.2s ease;
}

.skip-link:focus { top: 0; }

/* ---------- 9. 头部 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 80;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: linear-gradient(180deg, rgba(7, 11, 31, 0.92), rgba(7, 11, 31, 0));
  border-bottom: 1px solid transparent;
  transition: background-color 0.35s ease, border-color 0.35s ease, backdrop-filter 0.35s ease;
}

.site-header[data-scrolled="true"] {
  background: rgba(14, 22, 51, 0.95);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--navy-700);
}

.header-inner {
  position: relative;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

@media (min-width: 768px) {
  .header-inner { padding: 0 32px; }
}

.header-offset { height: var(--header-h); }

/* 品牌字标 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
  color: var(--white);
}

.brand-glyph {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--violet), var(--violet-500));
  color: var(--white);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 900;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.brand-text {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  line-height: 1;
  letter-spacing: -0.02em;
}

.brand-cn {
  margin-left: 6px;
  font-size: 15px;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.brand-suffix {
  font-size: var(--fs-1);
  color: var(--cyan);
  letter-spacing: 0.06em;
  align-self: flex-end;
  padding-bottom: 2px;
}

/* 导航（默认 = 移动端抽屉） */
.site-nav {
  position: fixed;
  top: var(--header-h);
  right: 0;
  bottom: 0;
  z-index: 95;
  width: min(86vw, 340px);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  padding: 28px 22px 40px;
  overflow-y: auto;
  background: linear-gradient(180deg, #0E1633 0%, #070B1F 100%);
  border-left: 1px solid var(--navy-700);
  box-shadow: -26px 0 60px -32px rgba(0, 0, 0, 0.95);
  transform: translateX(103%);
  visibility: hidden;
  transition: transform 0.34s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.34s;
}

.site-nav[data-open] {
  transform: translateX(0);
  visibility: visible;
}

body.nav-open::before {
  content: "";
  position: fixed;
  top: var(--header-h);
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 88;
  background: rgba(7, 11, 31, 0.68);
  -webkit-backdrop-filter: blur(3px);
  backdrop-filter: blur(3px);
}

@media (max-width: 1023px) {
  body.nav-open { overflow: hidden; }
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-link {
  position: relative;
  display: block;
  padding: 14px 12px;
  border-radius: var(--radius-s);
  font-size: 16px;
  font-weight: 500;
  color: var(--steel);
  transition: color 0.2s ease, background-color 0.2s ease;
}

.nav-link:hover {
  color: var(--white);
  background: rgba(122, 92, 255, 0.16);
}

.nav-link[aria-current="page"] {
  color: var(--white);
  background: rgba(74, 43, 217, 0.34);
}

.nav-cta {
  display: inline-flex;
  align-self: flex-start;
}

/* 头部操作区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.header-cta { display: none; }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--navy-700);
  border-radius: var(--radius-pill);
  color: var(--mist);
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

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

.nav-toggle[aria-expanded="true"] {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(34, 230, 208, 0.08);
}

.nav-toggle-bars {
  display: grid;
  gap: 4px;
  width: 16px;
}

.nav-toggle-bars i {
  display: block;
  height: 2px;
  width: 100%;
  background: currentColor;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* 阅读进度条 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(24, 42, 99, 0.55);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.site-header[data-scrolled="true"] .scroll-progress { opacity: 1; }

.scroll-progress i {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--violet) 0%, var(--violet-500) 32%, var(--cyan) 68%, var(--orange) 100%);
}

/* 桌面端导航横排 */
@media (min-width: 1024px) {
  .site-nav {
    position: static;
    width: auto;
    margin-left: auto;
    padding: 0;
    flex-direction: row;
    align-items: center;
    gap: 2px;
    background: none;
    border: 0;
    box-shadow: none;
    transform: none;
    visibility: visible;
    overflow: visible;
  }

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

  .nav-link {
    padding: 9px 13px;
    font-size: var(--fs-2);
  }

  .nav-cta { display: none; }

  .header-actions { margin-left: 14px; }

  .header-cta { display: inline-flex; }

  .nav-toggle { display: none; }

  body.nav-open::before { content: none; }
}

/* ---------- 10. 回到顶部 ---------- */
.to-top {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 70;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid var(--navy-700);
  border-radius: 50%;
  background: rgba(14, 22, 51, 0.92);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.25s ease, visibility 0.25s ease, transform 0.25s ease, border-color 0.25s ease;
}

.to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover { border-color: var(--cyan); }

/* ---------- 11. 页脚 ---------- */
.site-footer {
  margin-top: var(--sp-7);
  background: var(--navy-900);
  border-top: var(--line);
}

.footer-band { padding: var(--sp-6) 0 var(--sp-5); }

.footer-inner {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-5);
}

@media (min-width: 768px) {
  .footer-inner { padding: 0 32px; }
}

@media (min-width: 900px) {
  .footer-inner {
    grid-template-columns: 1.1fr 2fr;
    gap: var(--sp-6);
  }
}

.footer-brand { display: grid; gap: 0; align-content: start; }

.brand--footer {
  font-size: 21px;
  margin-bottom: 18px;
}

.footer-tagline {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.2vw, 32px);
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--white);
}

.footer-note {
  margin-top: 12px;
  max-width: 30ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel);
}

.footer-nav {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-4);
}

@media (min-width: 560px) {
  .footer-nav { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 16px;
}

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

.footer-links a {
  font-size: var(--fs-2);
  color: var(--steel);
  transition: color 0.2s ease;
}

.footer-links a:hover { color: var(--white); }

.footer-meta {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px 24px;
  padding-top: var(--sp-4);
  border-top: var(--line);
}

@media (min-width: 640px) {
  .footer-meta { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .footer-meta { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.meta-item {
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel);
  word-break: break-word;
}

.meta-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--navy-700);
  color: #55639B;
  margin-bottom: 2px;
}

.footer-base {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  border-top: var(--line);
}

@media (min-width: 768px) {
  .footer-base { padding: 20px 32px; }
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.04em;
  color: var(--steel);
}

.legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.legal-links a {
  font-size: 13px;
  color: var(--steel);
  transition: color 0.2s ease;
}

.legal-links a:hover { color: var(--cyan); }

/* ---------- 12. 显现动画（JS 协议 data-reveal） ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.js [data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: none;
}

.js [data-reveal][data-delay="1"] { transition-delay: 0.12s; }
.js [data-reveal][data-delay="2"] { transition-delay: 0.24s; }
.js [data-reveal][data-delay="3"] { transition-delay: 0.36s; }
.js [data-reveal][data-delay="4"] { transition-delay: 0.48s; }

/* ---------- 13. 降级偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  html { scroll-behavior: auto; }

  .js [data-reveal],
  .js [data-reveal][data-revealed="true"] {
    opacity: 1;
    transform: none;
  }

  .card:hover { transform: none; }
  .btn--cta:hover { transform: none; }
}