/* ==========================================================================
   common.css — 公共样式 & 设计系统
   青鸟阁 · 北京青鸟歌文化传媒有限公司

   色彩取自「宋代汝窑典型釉色卡」：
   天青 / 粉青 / 天蓝 / 虾青 / 豆青 / 月白 / 灰青
   ========================================================================== */

/* --------------------------------------------------------------------------
   设计令牌 Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* 汝窑釉色 */
  --ru-tianqing: #9fc6c6;   /* 天青 —— 主色 */
  --ru-fenqing:  #b8d1c8;   /* 粉青 */
  --ru-tianlan:  #a8c7d6;   /* 天蓝 */
  --ru-xiaqing:  #89aeb7;   /* 虾青 */
  --ru-douqing:  #a6c3b6;   /* 豆青 */
  --ru-yuebai:   #c6d6d6;   /* 月白 */
  --ru-huiqing:  #7b9fa2;   /* 灰青 */

  /* 语义色 */
  --color-primary:        var(--ru-tianqing);
  --color-primary-deep:   #6fa8ab;   /* 天青加深，用于 hover/强调 */
  --color-primary-dark:   #4d7c80;   /* 更深，用于文字强调 */
  --color-accent:         #e0a458;   /* 暖金 —— CTA 强调色 */
  --color-accent-deep:    #cf8f3f;

  /* 中性色 */
  --color-ink:       #2f3b3d;   /* 主文字 */
  --color-ink-soft:  #5d6f72;   /* 次要文字 */
  --color-ink-faint: #8fa0a3;   /* 弱化文字 */
  --color-line:      #e2ebec;   /* 分隔线 */
  --color-bg:        #f4f8f8;   /* 页面底色（极浅青） */
  --color-bg-soft:   #eaf2f2;   /* 柔和分块底色 */
  --color-white:     #ffffff;

  /* 渐变（更自然、传统） */
  --grad-hero: linear-gradient(135deg, #d0e8e8 0%, #9fc6c6 40%, #a8c7d6 85%, #c6d6d6 100%);
  --grad-card: linear-gradient(145deg, #f9fcfc 0%, #eef6f6 50%, #e3efef 100%);
  --grad-cta:  linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-deep) 100%);
  --grad-ink: linear-gradient(180deg, rgba(47, 59, 61, 0.02) 0%, rgba(159, 198, 198, 0.05) 100%);

  /* 圆角 */
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;

  /* 阴影（更柔和、传统） */
  --shadow-sm: 0 2px 12px rgba(77, 124, 128, 0.06), 0 1px 3px rgba(77, 124, 128, 0.04);
  --shadow-md: 0 4px 20px rgba(77, 124, 128, 0.08), 0 2px 8px rgba(77, 124, 128, 0.06);
  --shadow-lg: 0 12px 40px rgba(77, 124, 128, 0.12), 0 4px 16px rgba(77, 124, 128, 0.08);
  --shadow-card: 0 2px 16px rgba(159, 198, 198, 0.15), 0 1px 4px rgba(77, 124, 128, 0.08);

  /* 字体 */
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
               "Source Han Sans SC", "Noto Sans SC", system-ui, sans-serif;
  --font-serif: "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif;

  /* 布局 */
  --container: 1200px;
  --header-h: 68px;

  /* 动效 */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 0.28s;
}

/* --------------------------------------------------------------------------
   基础
   -------------------------------------------------------------------------- */
body {
  font-family: var(--font-sans);
  color: var(--color-ink);
  background: linear-gradient(to bottom, #fafcfc 0%, var(--color-bg) 100%);
  background-attachment: fixed;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}

/* 区块标题 */
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 32px;
}

.section-title {
  position: relative;
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-ink);
  padding-left: 20px;
}

/* 标题前的传统装饰 */
.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 5px;
  height: 1.3em;
  border-radius: var(--radius-pill);
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--ru-tianlan) 100%);
  box-shadow: 0 0 8px rgba(159, 198, 198, 0.4);
}

.section-sub {
  color: var(--color-ink-faint);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
}

.section-more {
  flex-shrink: 0;
  font-size: 0.9rem;
  color: var(--color-primary-dark);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap var(--dur) var(--ease), color var(--dur) var(--ease);
}
.section-more:hover {
  gap: 10px;
  color: var(--color-primary-deep);
}

/* --------------------------------------------------------------------------
   按钮
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  border: 1px solid transparent;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
              background var(--dur) var(--ease), color var(--dur) var(--ease);
  will-change: transform;
}
.btn:active { transform: translateY(1px) scale(0.98); }

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--ru-tianlan) 100%);
  color: #fff;
  box-shadow: 0 4px 12px rgba(159, 198, 198, 0.3);
}
.btn--primary:hover {
  background: linear-gradient(135deg, var(--color-primary-deep) 0%, #8fb6ba 100%);
  box-shadow: 0 6px 20px rgba(159, 198, 198, 0.4);
  transform: translateY(-2px);
}

.btn--accent {
  background: var(--grad-cta);
  color: #fff;
  box-shadow: 0 6px 18px rgba(224, 164, 88, 0.35);
}
.btn--accent:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(224, 164, 88, 0.45); }

.btn--ghost {
  background: transparent;
  color: var(--color-primary-dark);
  border-color: var(--ru-yuebai);
}
.btn--ghost:hover { background: var(--color-bg-soft); border-color: var(--color-primary); }

.btn--block { width: 100%; }
.btn--sm { padding: 7px 16px; font-size: 0.85rem; }
.btn--lg { padding: 14px 34px; font-size: 1.02rem; }

/* --------------------------------------------------------------------------
   标签 / 徽章
   -------------------------------------------------------------------------- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  background: var(--color-bg-soft);
  color: var(--color-primary-dark);
  border: 1px solid var(--color-line);
}
.tag--solid { background: var(--color-primary); color: #fff; border-color: transparent; }

/* --------------------------------------------------------------------------
   顶部导航 Header
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid rgba(159, 198, 198, 0.15);
  box-shadow: 0 1px 8px rgba(159, 198, 198, 0.08);
}

.site-header__inner {
  max-width: 1400px;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.brand__logo {
  width: 42px;
  height: 42px;
  flex-shrink: 0;
}
.brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.brand__name {
  font-family: var(--font-serif);
  font-size: 1.28rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--color-primary-dark);
}
.brand__slogan {
  font-size: 0.66rem;
  letter-spacing: 0.3em;
  color: var(--color-ink-faint);
}

.main-nav { display: flex; align-items: center; gap: 2px; }
.main-nav a {
  position: relative;
  padding: 8px 11px;
  border-radius: var(--radius-pill);
  font-size: 0.94rem;
  font-weight: 500;
  white-space: nowrap;
  color: var(--color-ink-soft);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.main-nav a:hover { color: var(--color-primary-dark); background: var(--color-bg-soft); }
.main-nav a.is-active {
  color: var(--color-primary-dark);
}
.main-nav a.is-active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  transform: translateX(-50%);
  width: 18px;
  height: 3px;
  border-radius: var(--radius-pill);
  background: var(--color-primary);
}

/* 英文版：品牌名与导航词较长，桌面完整导航时整体收窄，保证中英文都整齐不换行（汉堡菜单内不受影响） */
@media (min-width: 1401px) {
  html[lang="en"] .main-nav a { padding: 8px 8px; font-size: 0.85rem; }
  html[lang="en"] .brand__name { font-size: 1rem; letter-spacing: 0.02em; }
  html[lang="en"] .site-header__inner { gap: 14px; }
  html[lang="en"] .header-actions { gap: 8px; }
  html[lang="en"] .header-actions .btn--sm { padding: 7px 12px; font-size: 0.82rem; }
}

.header-actions { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }

/* 语言切换按钮 */
.lang-toggle {
  min-width: 40px;
  padding: 7px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--ru-yuebai);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  background: transparent;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.lang-toggle:hover { background: var(--color-bg-soft); border-color: var(--color-primary); }

/* 购物车图标 + 角标 */
.cart-link {
  position: relative;
  width: 42px; height: 42px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--color-primary-dark);
  transition: background var(--dur) var(--ease);
}
.cart-link:hover { background: var(--color-bg-soft); }
.cart-badge {
  position: absolute;
  top: 2px; right: 0;
  min-width: 18px; height: 18px;
  padding: 0 5px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  display: grid;
  place-items: center;
  line-height: 1;
}

/* 汉堡按钮（移动端） */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-primary-dark);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* --------------------------------------------------------------------------
   页脚 Footer
   -------------------------------------------------------------------------- */
.site-footer {
  margin-top: 80px;
  background: linear-gradient(180deg, #445d61 0%, #3c5a5e 50%, #2f4a4e 100%);
  color: #d8e8e9;
  position: relative;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(159, 198, 198, 0.3) 50%, transparent 100%);
}
.site-footer a { color: #cfe0e1; transition: color var(--dur) var(--ease); }
.site-footer a:hover { color: #fff; }

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding: 56px 0 40px;
}
.footer-brand .brand__name { color: #fff; }
.footer-brand .brand__slogan { color: #9dbabd; }
.footer-desc {
  margin-top: 16px;
  font-size: 0.88rem;
  line-height: 1.8;
  color: #a8c2c5;
  max-width: 34ch;
}
.footer-title {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 18px;
  letter-spacing: 0.06em;
}
.footer-links li { margin-bottom: 12px; font-size: 0.9rem; }
.footer-contact li {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 0.9rem;
  color: #a8c2c5;
}
.footer-contact li svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
  color: #9dbabd;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.82rem;
  color: #93afb2;
}

/* --------------------------------------------------------------------------
   青鸟装饰元素
   -------------------------------------------------------------------------- */
.bird-deco {
  position: absolute;
  pointer-events: none;
  user-select: none;
  opacity: 0.9;
}

/* 漂浮动画 */
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.animate-float { animation: floaty 5s ease-in-out infinite; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.reveal { opacity: 0; }
.reveal.is-in { animation: fadeUp 0.7s var(--ease) forwards; }

/* --------------------------------------------------------------------------
   工具类
   -------------------------------------------------------------------------- */
.text-accent { color: var(--color-accent-deep); }
.text-primary { color: var(--color-primary-dark); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.hidden { display: none !important; }
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}