/* ============================================================
 * 全站基础样式 - 武汉习韶科技有限公司
 * 设计基调：深蓝 + 橙金 + 米白，衬线/无衬线混排
 * ========================================================== */

/* ---------- CSS 变量：设计令牌 ---------- */
:root {
  /* 主色 */
  --c-primary: #0F2C5C;        /* 深蓝（品牌主色） */
  --c-primary-deep: #0A1F44;   /* 深蓝加深（hover/footer） */
  --c-accent: #F2A516;         /* 橙金（高亮/按钮） */
  --c-accent-deep: #C7860C;    /* 橙金加深 */
  --c-bg: #F7F4ED;             /* 米白背景 */
  --c-bg-card: #FFFFFF;        /* 卡片白 */
  --c-text: #1A1A1A;           /* 主文字 */
  --c-text-2: #4A4A4A;         /* 副文字 */
  --c-text-3: #8C8C8C;         /* 弱化文字 */
  --c-border: #E3DED2;         /* 描边色 */
  --c-danger: #D64545;         /* 警示红 */

  /* 字体 */
  --f-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --f-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --f-display: "Cormorant Garamond", "Playfair Display", "Noto Serif SC", serif;

  /* 间距 */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;
  --sp-7: 48px;
  --sp-8: 64px;
  --sp-9: 96px;

  /* 圆角 */
  --r-sm: 6px;
  --r-md: 12px;
  --r-lg: 20px;
  --r-pill: 999px;

  /* 阴影 */
  --sh-sm: 0 1px 2px rgba(15, 44, 92, .08);
  --sh-md: 0 6px 20px rgba(15, 44, 92, .10);
  --sh-lg: 0 20px 50px rgba(15, 44, 92, .18);
}

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

html, body { margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--f-sans);
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

input, textarea, select { font-family: inherit; font-size: inherit; }

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--f-serif);
  font-weight: 700;
  line-height: 1.25;
  margin: 0;
  color: var(--c-text);
}

/* ---------- 全局容器 ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--sp-5);
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 244, 237, 0.85);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid rgba(15, 44, 92, .08);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-family: var(--f-serif);
  font-weight: 700;
}

.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  background: var(--c-primary);
  color: var(--c-accent);
  border-radius: 8px;
  font-family: var(--f-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-text strong {
  font-size: 30px;
  color: var(--c-primary);
  letter-spacing: 0.04em;
}

.brand-text span {
  font-size: 11px;
  color: var(--c-text-3);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-family: var(--f-display);
}

.nav-links {
  display: flex;
  gap: var(--sp-6);
  align-items: center;
}

.nav-links a {
  position: relative;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text-2);
  padding: 6px 2px;
  transition: color .2s ease;
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--c-primary);
}

.nav-links a.is-active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  background: var(--c-accent);
  border-radius: 2px;
}

.nav-actions {
  display: flex;
  gap: var(--sp-3);
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--r-pill);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
  white-space: nowrap;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--c-primary);
  color: #fff;
  box-shadow: var(--sh-sm);
}

.btn-primary:hover {
  background: var(--c-primary-deep);
  box-shadow: var(--sh-md);
}

.btn-ghost {
  color: var(--c-primary);
  border: 1px solid var(--c-primary);
}

.btn-ghost:hover {
  background: var(--c-primary);
  color: #fff;
}

.btn-accent {
  background: var(--c-accent);
  color: var(--c-primary);
  box-shadow: var(--sh-sm);
}

.btn-accent:hover {
  background: var(--c-accent-deep);
  color: #fff;
}

/* 汉堡菜单（移动端） */
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-primary);
  position: relative;
}

.nav-toggle span::before,
.nav-toggle span::after {
  content: '';
  position: absolute;
  left: 0;
  width: 22px;
  height: 2px;
  background: var(--c-primary);
}

.nav-toggle span::before { top: -7px; }
.nav-toggle span::after { top: 7px; }

/* ---------- 主内容区 ---------- */
main {
  flex: 1;
}

/* ---------- 底部 Footer ---------- */
.site-footer {
  margin-top: var(--sp-9);
  background: var(--c-primary-deep);
  color: #C7C9D6;
  padding: var(--sp-7) 0 var(--sp-5);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 0%, rgba(242, 165, 22, .12), transparent 40%),
    radial-gradient(circle at 90% 100%, rgba(242, 165, 22, .08), transparent 50%);
  pointer-events: none;
}

.footer-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: var(--sp-7);
  margin-bottom: var(--sp-6);
}

.footer-col h4 {
  color: #fff;
  font-size: 14px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: var(--sp-4);
  font-family: var(--f-sans);
  font-weight: 600;
}

.footer-col p,
.footer-col li {
  font-size: 13px;
  color: #A5A8B8;
  line-height: 1.9;
}

.footer-col li + li { margin-top: 4px; }

.footer-col a:hover { color: var(--c-accent); }

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-4);
}

.footer-brand .brand-mark { background: var(--c-accent); color: var(--c-primary); }

.footer-brand strong {
  color: #fff;
  font-family: var(--f-serif);
  font-size: 18px;
}

.footer-tag {
  font-family: var(--f-display);
  letter-spacing: 0.2em;
  color: var(--c-accent);
  font-size: 12px;
  text-transform: uppercase;
}

.footer-bottom {
  position: relative;
  border-top: 1px solid rgba(255, 255, 255, .08);
  padding-top: var(--sp-4);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--sp-3);
  font-size: 16px;
  color: #FFFFFF;
}

.footer-bottom a:hover { color: var(--c-accent); }

/* ---------- 通用动画 ---------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .8s ease, transform .8s ease;
}

.reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 工具类 ---------- */
.text-accent { color: var(--c-accent); }
.text-primary { color: var(--c-primary); }
.text-muted { color: var(--c-text-3); }

.divider {
  width: 48px;
  height: 2px;
  background: var(--c-accent);
  margin: var(--sp-4) 0;
}

.eyebrow {
  display: inline-block;
  font-family: var(--f-display);
  font-size: 12px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: var(--sp-3);
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.is-open {
    display: flex;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--c-bg);
    padding: var(--sp-4) var(--sp-5);
    border-bottom: 1px solid var(--c-border);
    gap: var(--sp-3);
  }
  .footer-grid { grid-template-columns: 1fr; gap: var(--sp-5); }
}