/* ================================================
   星空XINGKONG 全站共享样式
   结构: Tokens → Reset → 排版 → 布局 → 头部 → 导航
        → 页脚 → 组件 → 工具 → 响应式 → 无障碍
   ================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  --cream: #F5EFE6;
  --ink: #21170F;
  --red: #D6412F;
  --orange: #E77A2E;
  --night-blue: #1B3A5B;
  --night-blue-deep: #0E2236;
  --mid-brown: #8B6E5A;
  --glass: rgba(255, 255, 255, 0.6);
  --glass-line: rgba(224, 211, 195, 0.6);
  --line: #E0D3C3;
  --line-dark: rgba(245, 239, 230, 0.15);

  --font-display: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;

  --text-primary: var(--ink);
  --text-muted: var(--mid-brown);
  --text-reverse: var(--cream);

  --bg-primary: var(--cream);
  --bg-dark: var(--night-blue);

  --header-h: 76px;
  --container-w: 1200px;
  --container-narrow-w: 740px;

  --radius-s: 4px;
  --radius-m: 10px;
  --radius-l: 18px;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 40px;
  --space-5: 64px;
  --space-6: 96px;

  --shadow-card: 0 4px 20px rgba(33, 23, 15, 0.08);
  --shadow-pop: 0 16px 48px rgba(33, 23, 15, 0.16);
  --shadow-glow: 0 0 32px rgba(27, 58, 91, 0.35);
  --shadow-red: 0 4px 16px rgba(214, 65, 47, 0.28);
  --shadow-orange: 0 0 14px rgba(231, 122, 46, 0.35);

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.78;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

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

ul,
ol {
  list-style: none;
}

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

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

/* ---------- 中文排版 ---------- */
h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

h1 {
  font-size: clamp(30px, 4.5vw, 48px);
  line-height: 1.2;
}

h2 {
  font-size: clamp(24px, 3vw, 32px);
}

h3 {
  font-size: 22px;
}

p {
  text-wrap: pretty;
  max-width: 65ch;
}

strong {
  font-weight: 600;
  color: var(--red);
}

.caption {
  font-size: 14px;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* ---------- 布局容器 ---------- */
.l-container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.l-container--narrow {
  max-width: var(--container-narrow-w);
}

.c-site-main {
  min-height: 60vh;
  padding-top: var(--header-h);
}

.c-page-hero {
  padding: calc(var(--header-h) + var(--space-5)) 0 var(--space-5);
  background: linear-gradient(160deg, var(--night-blue-deep) 0%, var(--night-blue) 55%, #2E5570 100%);
  color: var(--text-reverse);
  position: relative;
  overflow: hidden;
}

.c-page-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 15% 25%, rgba(255, 255, 255, 0.5), transparent 100%),
    radial-gradient(1px 1px at 70% 15%, rgba(255, 255, 255, 0.4), transparent 100%),
    radial-gradient(2px 2px at 45% 65%, rgba(231, 122, 46, 0.4), transparent 100%),
    radial-gradient(1px 1px at 85% 45%, rgba(255, 255, 255, 0.3), transparent 100%),
    radial-gradient(1px 1px at 20% 80%, rgba(255, 255, 255, 0.35), transparent 100%);
  pointer-events: none;
}

.c-page-hero > * {
  position: relative;
  z-index: 1;
}

/* ---------- 章节面板 ---------- */
.c-panel {
  position: relative;
  padding-block: var(--space-6);
}

.c-panel + .c-panel {
  border-top: 1px solid var(--line);
}

.c-panel--dark {
  background-color: var(--bg-dark);
  color: var(--text-reverse);
}

.c-panel--dark + .c-panel--dark {
  border-top-color: var(--line-dark);
}

.c-panel--glow::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--orange), var(--red), transparent);
}

.c-panel--angle {
  clip-path: polygon(0 4%, 100% 0, 100% 96%, 0 100%);
  margin-block: var(--space-4);
}

.c-panel[data-active] {
  box-shadow: inset 6px 0 0 var(--red);
}

.c-section {
  padding-block: var(--space-5);
}

/* ---------- 画板栅格 ---------- */
.c-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-4);
}

.c-grid__span-4 {
  grid-column: span 4;
}

.c-grid__span-6 {
  grid-column: span 6;
}

.c-grid__span-8 {
  grid-column: span 8;
}

@media (max-width: 768px) {
  .c-grid__span-4,
  .c-grid__span-6,
  .c-grid__span-8 {
    grid-column: span 12;
  }
}

/* ---------- 按钮 ---------- */
.c-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 30px;
  border-radius: 6px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.1em;
  border: 2px solid transparent;
  transition:
    transform 220ms var(--ease-out),
    box-shadow 220ms var(--ease-out),
    background-color 220ms var(--ease-out),
    color 220ms var(--ease-out);
  white-space: nowrap;
}

.c-btn--primary {
  background-color: var(--red);
  color: var(--cream);
  box-shadow: 0 3px 0 #A93221;
}

.c-btn--primary:hover {
  background-color: #C03A27;
  transform: translateY(-2px);
  box-shadow: var(--shadow-red);
}

.c-btn--ghost {
  border-color: var(--ink);
  color: var(--ink);
  background: transparent;
}

.c-btn--ghost:hover {
  background-color: var(--ink);
  color: var(--cream);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.c-btn--light {
  border-color: rgba(245, 239, 230, 0.85);
  color: var(--cream);
}

.c-btn--light:hover {
  background-color: var(--cream);
  color: var(--night-blue);
  transform: translateY(-2px);
}

.c-btn:active {
  transform: translateY(0);
}

/* ---------- 标签与数据 ---------- */
.c-chip {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  border: 1px solid var(--line);
  color: var(--mid-brown);
  background: transparent;
  line-height: 1.5;
}

.c-chip--accent {
  border-color: rgba(214, 65, 47, 0.5);
  color: var(--red);
  background: rgba(214, 65, 47, 0.06);
}

.c-chip--orange {
  border-color: rgba(231, 122, 46, 0.5);
  color: var(--orange);
  background: rgba(231, 122, 46, 0.08);
}

.c-chip--blue {
  border-color: rgba(27, 58, 91, 0.4);
  color: var(--night-blue);
  background: rgba(27, 58, 91, 0.06);
}

.c-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: var(--space-3) var(--space-3);
  background: var(--glass);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-card);
}

.c-stat__value {
  font-family: var(--font-display);
  font-size: 42px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--red);
  letter-spacing: -0.03em;
}

.c-stat__label {
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--mid-brown);
}

/* ---------- 卡片 ---------- */
.c-glass-card {
  background: var(--glass);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-l);
  padding: var(--space-4);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-card);
  transition: transform 260ms var(--ease-out), box-shadow 260ms var(--ease-out);
}

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

/* ---------- 星号分隔线 ---------- */
.c-mark-line {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--orange);
  font-size: 14px;
  letter-spacing: 0.2em;
  user-select: none;
}

.c-mark-line::before,
.c-mark-line::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.c-mark-line--dark {
  color: var(--orange);
}

.c-mark-line--dark::before,
.c-mark-line--dark::after {
  background: var(--line-dark);
}

/* ---------- 时间线 ---------- */
.c-timeline {
  position: relative;
  padding-top: var(--space-2);
}

.c-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--orange), var(--red), rgba(224, 211, 195, 0.4));
  border-radius: 2px;
}

.c-timeline__item {
  position: relative;
  padding: 0 0 var(--space-3) 44px;
}

.c-timeline__item:last-child {
  padding-bottom: 0;
}

.c-timeline__dot {
  position: absolute;
  left: 0;
  top: 2px;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  line-height: 1;
  color: var(--orange);
  background: var(--cream);
  border-radius: 50%;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-orange);
}

.c-timeline__dot--solid {
  background: var(--orange);
  color: var(--cream);
  border-color: var(--orange);
  box-shadow: var(--shadow-orange);
}

/* ---------- 面包屑 ---------- */
.c-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--mid-brown);
  margin-bottom: var(--space-4);
}

.c-breadcrumb a {
  color: var(--ink);
  transition: color 160ms ease;
}

.c-breadcrumb a:hover {
  color: var(--red);
}

.c-breadcrumb__sep {
  color: var(--mid-brown);
  opacity: 0.5;
  font-size: 12px;
}

.c-breadcrumb [aria-current="page"] {
  color: var(--red);
  font-weight: 500;
}

/* ---------- 品牌 ---------- */
.c-brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: inherit;
}

.c-brand__star {
  font-size: 26px;
  line-height: 1;
  color: var(--orange);
  text-shadow: 0 0 14px rgba(231, 122, 46, 0.5);
  transition: transform 320ms var(--ease-out), text-shadow 320ms var(--ease-out);
  flex-shrink: 0;
}

.c-brand:hover .c-brand__star {
  transform: rotate(-24deg) scale(1.12);
  text-shadow: 0 0 24px rgba(231, 122, 46, 0.8);
}

.c-brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.c-brand__name {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.2;
}

.c-brand__tagline {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mid-brown);
  white-space: nowrap;
}

/* ---------- 固定头部 ---------- */
.c-site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: transparent;
  border-bottom: 1px solid transparent;
  color: var(--cream);
  transition:
    background-color 320ms var(--ease-standard),
    color 320ms var(--ease-standard),
    border-color 320ms var(--ease-standard),
    box-shadow 320ms var(--ease-standard);
}

.c-site-header .c-brand__tagline {
  color: rgba(245, 239, 230, 0.58);
}

.c-site-header[data-scrolled="true"] {
  background: var(--cream);
  border-bottom-color: var(--line);
  color: var(--ink);
  box-shadow: 0 2px 18px rgba(33, 23, 15, 0.08);
}

.c-site-header[data-scrolled="true"] .c-brand__tagline {
  color: var(--mid-brown);
}

.c-site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  min-height: var(--header-h);
}

/* 阅读进度条 */
.c-progress {
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--orange), var(--red));
  border-radius: 0 3px 3px 0;
  z-index: 1002;
  pointer-events: none;
  transition: width 90ms linear;
}

/* ---------- 主导航 ---------- */
.c-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.c-nav__link {
  position: relative;
  display: inline-block;
  padding: 12px 18px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: inherit;
  white-space: nowrap;
  transition: color 180ms ease;
}

.c-nav__link::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 6px;
  height: 2px;
  background: var(--red);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 320ms var(--ease-out);
}

.c-site-header:not([data-scrolled="true"]) .c-nav__link::after {
  background: var(--cream);
}

.c-nav__link:hover::after,
.c-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.c-site-header:not([data-scrolled="true"]) .c-nav__link[aria-current="page"] {
  color: var(--cream);
  text-shadow: 0 0 12px rgba(245, 239, 230, 0.4);
}

.c-site-header[data-scrolled="true"] .c-nav__link[aria-current="page"] {
  color: var(--red);
}

/* 移动导航按钮 */
.c-nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px;
  color: inherit;
  border-radius: var(--radius-s);
  transition: background-color 180ms ease;
}

.c-nav-toggle:hover {
  background-color: rgba(255, 255, 255, 0.12);
}

.c-site-header[data-scrolled="true"] .c-nav-toggle:hover {
  background-color: rgba(33, 23, 15, 0.07);
}

.c-nav-toggle__box {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 22px;
}

.c-nav-toggle__line {
  display: block;
  height: 2px;
  width: 100%;
  background: currentColor;
  border-radius: 2px;
  transition: transform 260ms var(--ease-out), opacity 200ms ease;
}

.c-nav-toggle__text {
  font-size: 14px;
  letter-spacing: 0.08em;
}

@media (max-width: 768px) {
  .c-nav-toggle {
    display: inline-flex;
  }

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

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

  .c-nav-toggle[aria-expanded="true"] .c-nav-toggle__line:nth-child(3) {
    transform: translateY(-3.5px) rotate(-45deg);
  }

  .c-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--cream);
    color: var(--ink);
    max-height: 0;
    overflow: hidden;
    box-shadow: none;
    transition: max-height 420ms var(--ease-out), box-shadow 420ms var(--ease-out);
  }

  .c-nav[data-open] {
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    box-shadow: 0 24px 48px rgba(33, 23, 15, 0.16);
  }

  .c-nav__list {
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-2) var(--space-3) var(--space-3);
  }

  .c-nav__item {
    width: 100%;
  }

  .c-nav__link {
    display: block;
    width: 100%;
    padding: 15px 8px;
    border-bottom: 1px solid var(--line);
    font-size: 16px;
  }

  .c-nav__link::after {
    display: none;
  }

  .c-nav__item:last-child .c-nav__link {
    border-bottom: none;
  }
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1003;
  padding: 10px 18px;
  background: var(--ink);
  color: var(--cream);
  font-size: 14px;
  border-radius: var(--radius-s);
  transform: translateY(-200%);
  transition: transform 220ms var(--ease-standard);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

/* ---------- 页脚 ---------- */
.c-site-footer {
  position: relative;
  background-color: var(--night-blue);
  color: var(--cream);
  overflow: hidden;
  padding-top: var(--space-6);
  background-image:
    radial-gradient(1px 1px at 12% 24%, rgba(255, 255, 255, 0.5), transparent 100%),
    radial-gradient(1px 1px at 76% 12%, rgba(255, 255, 255, 0.4), transparent 100%),
    radial-gradient(1px 1px at 32% 58%, rgba(255, 255, 255, 0.3), transparent 100%),
    radial-gradient(2px 2px at 88% 40%, rgba(231, 122, 46, 0.35), transparent 100%),
    radial-gradient(1px 1px at 52% 78%, rgba(255, 255, 255, 0.35), transparent 100%),
    radial-gradient(1px 1px at 66% 90%, rgba(255, 255, 255, 0.2), transparent 100%),
    radial-gradient(1px 1px at 8% 70%, rgba(255, 255, 255, 0.3), transparent 100%);
}

.c-site-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
  gap: var(--space-5);
  padding-bottom: var(--space-5);
}

.c-site-footer__brand-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: flex-start;
}

.c-site-footer__trust {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 239, 230, 0.58);
  max-width: 36ch;
}

.c-site-footer__col {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.c-site-footer__heading {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: rgba(245, 239, 230, 0.4);
  margin-bottom: var(--space-1);
  text-transform: uppercase;
}

.c-site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14px;
  color: rgba(245, 239, 230, 0.72);
  line-height: 1.6;
}

.c-site-footer__list a {
  transition: color 160ms ease, padding-left 160ms ease;
}

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

.c-site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  padding-block: var(--space-3) var(--space-2);
  border-top: 1px solid var(--line-dark);
  font-size: 13px;
  color: rgba(245, 239, 230, 0.5);
  letter-spacing: 0.04em;
}

@media (max-width: 1024px) {
  .c-site-footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .c-site-footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
}

/* 品牌反色 */
.c-brand--reverse {
  color: var(--cream);
}

.c-brand--reverse .c-brand__star {
  color: var(--orange);
  text-shadow: 0 0 18px rgba(231, 122, 46, 0.6);
}

/* ---------- 滚动显现协议 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 700ms var(--ease-out),
    transform 700ms var(--ease-out);
  transition-delay: calc(var(--reveal-delay, 0) * 100ms);
  will-change: opacity, transform;
}

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

/* ---------- 滚动章节高亮协议 ---------- */
[data-spy] {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

/* ---------- 焦点可见 ---------- */
:focus-visible {
  outline: 3px solid var(--red);
  outline-offset: 3px;
  border-radius: 2px;
}

.c-site-header :focus-visible {
  outline-color: var(--orange);
}

/* ---------- 减少动态偏好 ---------- */
@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;
  }

  .c-brand__star,
  .c-nav-toggle__line {
    transform: none !important;
  }
}

/* ---------- 深色透明状态覆写 ---------- */
[data-header-scheme="light"] .c-site-header:not([data-scrolled="true"]) {
  color: var(--ink);
}

[data-header-scheme="light"] .c-site-header:not([data-scrolled="true"]) .c-brand__tagline {
  color: var(--mid-brown);
}

[data-header-scheme="light"] .c-site-header:not([data-scrolled="true"]) .c-nav-toggle:hover {
  background-color: rgba(33, 23, 15, 0.07);
}

[data-header-scheme="light"] .c-site-header:not([data-scrolled="true"]) .c-nav__link[aria-current="page"] {
  color: var(--red);
  text-shadow: none;
}