/* ============================================
   俪索 LYSOURRS - 品牌设计系统（品牌家族式 · 墨绿+金）
   对齐「俪索终端学习互动空间」设计语言
   ============================================ */

:root {
  /* 品牌色 —— 墨绿主色 + 琥珀金强调 */
  --brand-primary: #1a3a32;        /* 墨绿主色 */
  --brand-primary-dark: #122b25;   /* 墨绿暗部 */
  --brand-primary-light: #245043;  /* 墨绿亮部 */
  --brand-gold: #D4A84B;           /* 琥珀金 */
  --brand-gold-dark: #B98F3A;      /* 琥珀金暗部 */
  --brand-gold-light: #F2E9D8;     /* 琥珀金亮部 */
  --brand-gold-bg: #FAF6EE;        /* 琥珀金背景 */

  /* 功能色 */
  --color-success: #52C41A;
  --color-success-bg: #F6FFED;
  --color-danger: #FF4D4F;
  --color-danger-bg: #FFF1F0;
  --color-warning: #FA8C16;
  --color-warning-bg: #FFF7E6;
  --color-info: #1890FF;
  --color-info-bg: #E6F7FF;

  /* 中性色 */
  --bg-page: #F4F2ED;              /* 米白页面底色 */
  --bg-card: #FFFFFF;
  --text-primary: #1A1A1A;
  --text-secondary: #5C5C5C;
  --text-tertiary: #999999;
  --text-quaternary: #BFBFBF;
  --border-light: #F0F0F0;
  --border-default: #E8E8E8;

  /* 阴影 —— 墨绿调 */
  --shadow-sm: 0 1px 4px rgba(26, 58, 50, 0.05);
  --shadow-md: 0 2px 12px rgba(26, 58, 50, 0.07);
  --shadow-lg: 0 8px 32px rgba(26, 58, 50, 0.11);
  --shadow-xl: 0 12px 48px rgba(26, 58, 50, 0.15);

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  /* 过渡 */
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   基础重置
   ============================================ */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, 'PingFang SC', 'Helvetica Neue', 'Microsoft YaHei', sans-serif;
  background: var(--bg-page);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   品牌头部 - 移动端
   ============================================ */
.brand-header {
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-dark) 100%);
  color: #fff;
  padding: 24px 20px 20px;
  position: relative;
  overflow: hidden;
}

.brand-header::before {
  content: '';
  position: absolute;
  top: -40px;
  right: -30px;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(212, 168, 75, 0.14) 0%, transparent 70%);
  pointer-events: none;
}

.brand-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-gold) 0%, var(--brand-gold-dark) 50%, var(--brand-gold) 100%);
}

.brand-header .brand-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.brand-header .brand-cn {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 2px;
  color: #fff;
}

.brand-header .brand-en {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 3px;
  color: var(--brand-gold);
  text-transform: uppercase;
}

.brand-header .brand-tagline {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 6px;
  letter-spacing: 1px;
}

.brand-header .brand-user {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.6);
  margin-top: 8px;
  cursor: pointer;
}

/* 带返回按钮的品牌头部 */
.brand-header-bar {
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-dark) 100%);
  color: #fff;
  padding: 14px 16px;
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  position: sticky;
}

.brand-header-bar::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--brand-gold) 0%, var(--brand-gold-dark) 50%, var(--brand-gold) 100%);
}

.brand-header-bar .back-btn {
  position: absolute;
  left: 16px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.85);
  cursor: pointer;
  transition: var(--transition);
}

.brand-header-bar .back-btn:active { color: var(--brand-gold); }

.brand-header-bar .bar-title {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.brand-header-bar .bar-title .t-cn {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 1px;
}

.brand-header-bar .bar-title .t-en {
  font-size: 11px;
  color: var(--brand-gold);
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* ============================================
   品牌Topbar - 桌面端管理后台
   ============================================ */
.brand-topbar {
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-dark) 100%);
  color: #fff;
  padding: 0 32px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  box-shadow: 0 2px 12px rgba(26, 58, 50, 0.18);
}

.brand-topbar::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-gold) 0%, var(--brand-gold-dark) 50%, var(--brand-gold) 100%);
}

.brand-topbar .topbar-brand {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.brand-topbar .topbar-brand .b-cn {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 3px;
}

.brand-topbar .topbar-brand .b-en {
  font-size: 12px;
  color: var(--brand-gold);
  letter-spacing: 4px;
  text-transform: uppercase;
}

.brand-topbar .topbar-brand .b-divider {
  width: 1px;
  height: 20px;
  background: rgba(255, 255, 255, 0.2);
  margin: 0 4px;
}

.brand-topbar .topbar-brand .b-sub {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
}

.brand-topbar .topbar-actions {
  display: flex;
  gap: 20px;
  align-items: center;
}

.brand-topbar .topbar-actions a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-size: 13px;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 4px;
}

.brand-topbar .topbar-actions a:hover {
  color: var(--brand-gold);
}

/* ============================================
   通用卡片
   ============================================ */
.brand-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: var(--transition);
}

.brand-card .card-header {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-primary);
}

.brand-card .card-header .header-accent {
  width: 3px;
  height: 16px;
  background: var(--brand-gold);
  border-radius: 2px;
  margin-right: 10px;
  display: inline-block;
  vertical-align: middle;
}

/* ============================================
   通用按钮
   ============================================ */
.btn-brand {
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-primary-dark));
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 2px 8px rgba(26, 58, 50, 0.22);
}

.btn-brand:active {
  transform: scale(0.97);
  box-shadow: 0 1px 4px rgba(26, 58, 50, 0.15);
}

.btn-brand:disabled {
  background: #ccc;
  box-shadow: none;
}

.btn-outline-gold {
  padding: 8px 20px;
  background: var(--bg-card);
  border: 1px solid var(--brand-gold);
  color: var(--brand-gold-dark);
  border-radius: var(--radius-md);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
}

.btn-outline-gold:active {
  background: var(--brand-gold-bg);
}

/* ============================================
   通用Badge
   ============================================ */
.badge {
  display: inline-block;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 500;
}

.badge-green { background: var(--color-success-bg); color: var(--color-success); }
.badge-red { background: var(--color-danger-bg); color: var(--color-danger); }
.badge-blue { background: var(--color-info-bg); color: var(--color-info); }
.badge-orange { background: var(--color-warning-bg); color: var(--color-warning); }
.badge-gold { background: var(--brand-gold-bg); color: var(--brand-gold-dark); }

/* ============================================
   品牌页脚
   ============================================ */
.brand-footer {
  text-align: center;
  padding: 24px 16px 20px;
  margin-top: 8px;
}

.brand-footer .footer-logo {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 8px;
  margin-bottom: 6px;
}

.brand-footer .footer-logo .f-cn {
  font-size: 16px;
  font-weight: 600;
  color: var(--brand-primary);
  letter-spacing: 2px;
}

.brand-footer .footer-logo .f-en {
  font-size: 11px;
  color: var(--brand-gold);
  letter-spacing: 3px;
  text-transform: uppercase;
}

.brand-footer .footer-line {
  width: 40px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--brand-gold), transparent);
  margin: 0 auto 8px;
}

.brand-footer .footer-text {
  font-size: 11px;
  color: var(--text-quaternary);
  letter-spacing: 0.5px;
}

/* ============================================
   照片预览遮罩（通用）
   ============================================ */
.photo-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.92);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

.photo-overlay.show { display: flex; }

.photo-overlay img {
  max-width: 95%;
  max-height: 90vh;
  border-radius: 4px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.photo-overlay-close {
  position: absolute;
  top: 16px;
  right: 20px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 28px;
  cursor: pointer;
  line-height: 1;
  transition: var(--transition);
}

.photo-overlay-close:hover { color: var(--brand-gold); }

/* ============================================
   动画
   ============================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeInUp 0.4s ease-out;
}