/* ================================================
   必博官方 · 中国区站内直达中心 — 全站共享样式
   文件：/assets/site.css
================================================ */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ---------- 2. CSS 变量 ---------- */
:root {
  --c-deep: #0B1F3A;
  --c-bay: #14355E;
  --c-azure: #4A9FD8;
  --c-frost: #D6EAF8;
  --c-orange: #FF6C2F;
  --c-amber: #FFB020;
  --c-warm: #F5F2ED;
  --c-ink: #1A1A1A;
  --c-gray: #4A4A4A;
  --c-green: #2E7D32;
  --c-red: #C62828;
  --c-gold: #E6B325;

  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, monospace;

  --r-lg: 28px;
  --r-md: 20px;
  --r-pill: 999px;

  --shadow-soft: 0 8px 30px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 14px 40px rgba(0, 0, 0, 0.12);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --sidebar-w: 280px;
  --content-max: 1180px;
}

/* ---------- 3. 基础排版 ---------- */
html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--c-warm);
  color: var(--c-ink);
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.75;
}

h1,
h2,
h3,
h4 {
  margin-bottom: 0.5em;
  font-family: var(--font-sans);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.4rem, 5vw, 4.2rem); }
h2 { font-size: clamp(1.8rem, 3vw, 2.8rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.7rem); }

p { margin-bottom: 1em; }

a {
  color: var(--c-azure);
  transition: color 200ms ease;
}

a:hover { text-decoration: underline; }

ul,
ol { padding-left: 1.4em; }

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

code,
pre,
kbd {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

blockquote {
  border-left: 4px solid var(--c-azure);
  padding-left: 20px;
  color: var(--c-gray);
  font-family: var(--font-serif);
  font-style: italic;
}

:focus-visible {
  outline: 3px solid var(--c-azure);
  outline-offset: 2px;
  border-radius: 4px;
}

.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. 正文容器 ---------- */
#main-content {
  flex: 1;
  outline: none;
}

.main-container {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 96px 40px 80px;
}

@media (max-width: 1023px) {
  .main-container {
    padding: 96px 32px 64px;
  }
}

@media (max-width: 767px) {
  .main-container {
    padding: 88px 20px 56px;
  }
}

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: 24px;
  z-index: 9999;
  padding: 12px 24px;
  border-radius: var(--r-pill);
  background: var(--c-orange);
  color: var(--c-deep);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 6px 20px rgba(255, 108, 47, 0.4);
  transition: top 200ms ease;
}

.skip-link:focus {
  top: 20px;
  text-decoration: none;
}

/* ---------- 6. 顶部工具条 ---------- */
.header-utility {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 400;
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 18px;
  padding: 8px 14px 8px 18px;
  background: rgba(11, 31, 58, 0.92);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-radius: var(--r-pill);
  box-shadow: 0 8px 24px rgba(11, 31, 58, 0.24);
}

.header-utility__brand {
  display: none;
}

.header-utility__legacy {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--r-pill);
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: background 200ms ease, transform 200ms var(--ease);
}

.header-utility__legacy::before {
  content: "↩";
  font-size: 0.95em;
}

.header-utility__legacy:hover {
  background: rgba(255, 255, 255, 0.24);
  text-decoration: none;
  transform: translateY(-1px);
}

/* ---------- 7. 汉堡按钮 ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  border: none;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);
  cursor: pointer;
  transition: background 200ms ease;
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.16);
}

.nav-toggle__line {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: #fff;
  transition: transform 250ms var(--ease), opacity 200ms ease;
}

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

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

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

/* ---------- 8. 侧边栏框架 ---------- */
.site-header {
  position: relative;
  z-index: 100;
}

.site-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 300;
  display: flex;
  flex-direction: column;
  width: var(--sidebar-w);
  height: 100vh;
  height: 100dvh;
  padding: 36px 24px 28px;
  overflow-y: auto;
  background: linear-gradient(170deg, var(--c-deep) 0%, var(--c-bay) 100%);
  transition: transform 350ms var(--ease), box-shadow 350ms ease;
}

.site-sidebar__brand {
  margin-bottom: 44px;
}

.site-sidebar__logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.site-sidebar__logo:hover {
  text-decoration: none;
}

.site-sidebar__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 52px;
  height: 52px;
  padding: 0 12px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--c-orange) 0%, var(--c-amber) 100%);
  color: var(--c-deep);
  font-family: var(--font-sans);
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  box-shadow: 0 6px 16px rgba(255, 108, 47, 0.28);
}

.site-sidebar__label {
  color: #fff;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: 0.02em;
}

.site-sidebar__sub {
  display: block;
  margin-top: 2px;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.58);
  letter-spacing: 0.08em;
}

/* 主导航 */
.primary-nav {
  flex: 1;
}

.primary-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.primary-nav__item {
  margin-bottom: 4px;
}

.primary-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 11px 16px;
  border-radius: var(--r-md);
  color: rgba(255, 255, 255, 0.7);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 500;
  text-decoration: none;
  transition: background 200ms ease, color 200ms ease, padding-left 250ms var(--ease);
}

.primary-nav__link:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.primary-nav__index {
  min-width: 22px;
  color: var(--c-azure);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  opacity: 0.78;
}

.primary-nav__link[aria-current="page"] {
  background: linear-gradient(90deg, rgba(255, 108, 47, 0.18) 0%, rgba(255, 108, 47, 0.04) 100%);
  border: 1px solid rgba(255, 108, 47, 0.22);
  color: #fff;
  font-weight: 700;
  padding-left: 14px;
}

.primary-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 22px;
  border-radius: 0 4px 4px 0;
  background: var(--c-orange);
}

.primary-nav__link[aria-current="page"] .primary-nav__index {
  color: var(--c-amber);
  opacity: 1;
}

/* 侧边底部 */
.site-sidebar__bottom {
  margin-top: auto;
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.version-pill {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--r-pill);
  background: rgba(255, 255, 255, 0.07);
  color: rgba(255, 255, 255, 0.85);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 200ms ease, border-color 200ms ease;
}

.version-pill:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 176, 32, 0.5);
  text-decoration: none;
}

.version-pill__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-amber);
  box-shadow: 0 0 7px rgba(255, 176, 32, 0.8);
}

.version-pill__arrow {
  color: var(--c-amber);
  font-size: 0.9em;
}

.site-sidebar__note {
  margin-top: 14px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: rgba(255, 255, 255, 0.42);
  letter-spacing: 0.06em;
}

/* ---------- 9. 响应式：侧边栏 / 抽屉 ---------- */
@media (max-width: 1023px) {
  body {
    margin-left: 0;
  }

  .header-utility {
    left: 0;
    right: 0;
    justify-content: space-between;
    margin: 0;
    padding: 10px 16px;
    border-radius: 0;
    background: var(--c-deep);
    box-shadow: 0 4px 20px rgba(11, 31, 58, 0.3);
  }

  .header-utility__brand {
    display: inline-block;
    color: #fff;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 800;
    letter-spacing: 0.02em;
    text-decoration: none;
  }

  .header-utility__brand span {
    color: var(--c-amber);
  }

  .header-utility__legacy {
    font-size: 0.75rem;
    padding: 6px 12px;
  }

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

  .site-sidebar {
    transform: translateX(-102%);
    width: min(320px, 86vw);
    padding-top: 96px;
    box-shadow: none;
  }

  .site-sidebar[data-open="true"] {
    transform: translateX(0);
    box-shadow: 24px 0 60px rgba(0, 0, 0, 0.35);
  }

  body.drawer-open::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 295;
    background: rgba(11, 31, 58, 0.45);
    pointer-events: auto;
  }
}

@media (max-width: 767px) {
  .header-utility__legacy {
    display: none;
  }
}

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

  .site-sidebar {
    transform: none;
  }
}

/* ---------- 10. 页脚 ---------- */
.site-footer {
  margin-top: 96px;
  padding: 64px 48px 28px;
  border-radius: var(--r-lg) var(--r-lg) 0 0;
  background: linear-gradient(180deg, var(--c-bay) 0%, var(--c-deep) 100%);
  color: rgba(255, 255, 255, 0.72);
  font-family: var(--font-sans);
}

.site-footer__inner {
  max-width: var(--content-max);
  margin: 0 auto;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 48px;
  margin-bottom: 48px;
}

.site-footer__about {
  padding-right: 16px;
}

.site-footer__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.site-footer__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--c-orange), var(--c-amber));
  color: var(--c-deep);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 900;
}

.site-footer__name {
  color: #fff;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 800;
  line-height: 1.4;
}

.site-footer__statement {
  max-width: 340px;
  color: rgba(255, 255, 255, 0.6);
  font-family: var(--font-serif);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 0;
}

.site-footer__heading {
  position: relative;
  margin-bottom: 16px;
  padding-bottom: 10px;
  color: #fff;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.site-footer__heading::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 26px;
  height: 3px;
  border-radius: 3px;
  background: var(--c-orange);
}

.site-footer__nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer__nav li {
  margin-bottom: 8px;
}

.site-footer__nav a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.88rem;
  text-decoration: none;
  transition: color 200ms ease, padding-left 200ms ease;
}

.site-footer__nav a:hover {
  color: var(--c-amber);
  padding-left: 4px;
}

.site-footer__contact {
  font-style: normal;
  font-size: 0.85rem;
  line-height: 2;
  color: rgba(255, 255, 255, 0.65);
}

.site-footer__contact p {
  margin-bottom: 0;
}

.site-footer__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 32px;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.45);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.site-footer__meta p {
  margin: 0;
}

.site-footer__support-note {
  margin-left: auto;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 1023px) {
  .site-footer {
    margin-top: 72px;
    padding: 48px 32px 24px;
  }

  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .site-footer__about {
    grid-column: 1 / -1;
  }
}

@media (max-width: 767px) {
  .site-footer {
    margin-top: 56px;
    padding: 40px 20px 20px;
    border-radius: var(--r-md) var(--r-md) 0 0;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .site-footer__about {
    grid-column: auto;
    padding-right: 0;
  }

  .site-footer__support-note {
    width: 100%;
    margin-left: 0;
  }
}

/* ---------- 11. 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border: none;
  border-radius: var(--r-pill);
  background: var(--c-orange);
  color: var(--c-deep);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  text-decoration: none;
  box-shadow: 0 4px 18px rgba(255, 108, 47, 0.28);
  transition: transform 250ms var(--ease), box-shadow 250ms ease, background 250ms ease;
}

.btn:hover {
  background: #ff7d45;
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(255, 108, 47, 0.4);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn--ghost {
  background: transparent;
  border: 2px solid var(--c-deep);
  box-shadow: none;
}

.btn--ghost:hover {
  background: rgba(11, 31, 58, 0.06);
  box-shadow: none;
}

.btn--light {
  background: #fff;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.12);
}

.btn--light:hover {
  background: var(--c-warm);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: var(--r-pill);
  background: var(--c-frost);
  color: var(--c-bay);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.tag--new {
  background: var(--c-amber);
  color: var(--c-deep);
}

.tag--hot {
  background: rgba(255, 108, 47, 0.12);
  color: var(--c-orange);
}

.tag--status {
  background: rgba(46, 125, 50, 0.1);
  color: var(--c-green);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-bottom: 24px;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--c-gray);
}

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

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb__sep {
  color: rgba(26, 26, 26, 0.28);
  font-size: 0.7rem;
}

.breadcrumb [aria-current="page"] {
  color: var(--c-gray);
  font-weight: 600;
}

.card {
  padding: 32px;
  border-radius: var(--r-lg);
  background: #fff;
  box-shadow: var(--shadow-soft);
  transition: transform 300ms var(--ease), box-shadow 300ms ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.figure-card {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 220px;
  overflow: hidden;
  border: 2px dashed rgba(11, 31, 58, 0.1);
  border-radius: var(--r-lg);
  background: linear-gradient(135deg, var(--c-frost) 0%, rgba(255, 255, 255, 0.5) 100%);
}

.figure-card__label {
  padding: 12px;
  color: var(--c-gray);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-align: center;
}

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

.section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 48px 0 24px;
}

.section-head__index {
  color: var(--c-orange);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.15em;
}

.section-head__title {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  font-weight: 800;
  line-height: 1.2;
}

.section-head__lead {
  color: var(--c-gray);
  font-family: var(--font-serif);
  font-size: 0.95rem;
}

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

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

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

@media (max-width: 767px) {
  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }
}

/* ---------- 12. 折叠面板 ---------- */
details {
  padding: 18px 24px;
  border: 1px solid rgba(11, 31, 58, 0.08);
  border-radius: var(--r-md);
  background: #fff;
  transition: box-shadow 250ms ease;
}

details[open] {
  box-shadow: var(--shadow-soft);
}

summary {
  position: relative;
  padding-right: 28px;
  color: var(--c-ink);
  font-family: var(--font-sans);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  color: var(--c-orange);
  font-size: 1.2rem;
  transition: transform 250ms var(--ease);
}

details[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

/* ---------- 13. 滚动显现协议 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 500ms var(--ease), transform 500ms var(--ease);
  transition-delay: var(--d, 0ms);
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 14. 动效偏好 ---------- */
@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;
  }

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

  .site-sidebar,
  .header-utility,
  .nav-toggle,
  .card {
    transition: none;
  }
}