/* 定义深色/浅色主题变量 */
:root {
  /* 默认深色主题 (低饱和、极简黑) */
  --bg-main: #0a0a0a;
  --bg-glow-1: rgba(255, 255, 255, 0.03);
  --bg-glow-2: rgba(255, 255, 255, 0.05);
  --glass-bg: rgba(25, 25, 25, 0.65);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --text-main: #f5f5f7;
  --text-muted: #86868b;
  --accent-color: #ffffff;
  --accent-hover: #e0e0e0;
  --accent-text: #000000;
  --danger-color: rgba(255, 69, 58, 0.8);
  --input-bg: rgba(255, 255, 255, 0.04);
}

[data-theme="light"] {
  /* 浅色主题 (类似 Apple 的高级灰白) */
  --bg-main: #f5f5f7;
  --bg-glow-1: rgba(0, 0, 0, 0.02);
  --bg-glow-2: rgba(0, 0, 0, 0.04);
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(0, 0, 0, 0.05);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
  --text-main: #1d1d1f;
  --text-muted: #86868b;
  --accent-color: #000000;
  --accent-hover: #333333;
  --accent-text: #ffffff;
  --danger-color: rgba(255, 59, 48, 0.9);
  --input-bg: rgba(0, 0, 0, 0.03);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, sans-serif;
  transition: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

body {
  background-color: var(--bg-main);
  background-image: 
    radial-gradient(circle at 15% 50%, var(--bg-glow-1), transparent 25%),
    radial-gradient(circle at 85% 30%, var(--bg-glow-2), transparent 25%);
  background-attachment: fixed;
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 导航栏 (极致毛玻璃) */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.2rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: -0.5px;
  color: var(--text-main);
  text-decoration: none;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.theme-toggle {
  background: none;
  border: none;
  color: var(--text-main);
  cursor: pointer;
  font-size: 1.2rem;
  opacity: 0.7;
}

.theme-toggle:hover { opacity: 1; }

.admin-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
}
.admin-link:hover { color: var(--text-main); }

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 2rem;
  flex: 1;
  width: 100%;
}

/* 无边框表单与控制栏 */
.controls {
  display: flex;
  gap: 1rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.search-input, .select-input, .form-input, .form-textarea {
  background: var(--input-bg);
  border: none;
  border-bottom: 1px solid var(--glass-border);
  color: var(--text-main);
  padding: 1rem 1.2rem;
  border-radius: 12px 12px 0 0;
  outline: none;
  font-size: 1rem;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.search-input { flex: 1; min-width: 250px; }

.search-input:focus, .select-input:focus, .form-input:focus, .form-textarea:focus {
  background: var(--glass-bg);
  border-bottom: 1px solid var(--accent-color);
  box-shadow: 0 10px 20px -10px rgba(0,0,0,0.1);
}

/* 玻璃拟态卡片网格 */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
}

.card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--glass-shadow);
  transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1), box-shadow 0.4s ease;
}

.card:hover {
  transform: translateY(-8px) scale(1.01);
  box-shadow: 0 20px 40px -10px rgba(0,0,0,0.2);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  margin-bottom: 1.5rem;
}

.card-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  object-fit: cover;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.card-title h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 6px;
  letter-spacing: -0.3px;
}

.card-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.card-desc {
  font-size: 0.95rem;
  color: var(--text-main);
  opacity: 0.8;
  line-height: 1.6;
  margin-bottom: 2rem;
  flex: 1;
}

/* 按钮设计 */
.btn {
  background: var(--input-bg);
  color: var(--text-main);
  border: 1px solid var(--glass-border);
  padding: 0.8rem 1.5rem;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 500;
  font-size: 0.9rem;
  text-decoration: none;
  text-align: center;
  transition: all 0.3s;
  display: inline-block;
}

.btn:hover { background: var(--glass-bg); }

.btn-primary {
  background: var(--accent-color);
  color: var(--accent-text);
  border: none;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

.btn-danger { background: transparent; color: var(--danger-color); border-color: var(--danger-color); }
.btn-danger:hover { background: var(--danger-color); color: #fff; }

.card-footer { display: flex; gap: 1rem; }
.card-footer .btn { flex: 1; }

/* 弹窗及动画 */
.modal {
  display: none; /* 默认隐藏 */
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.modal.active {
  display: flex; /* 触发显示 */
  opacity: 1;
}

.modal-content {
  background: var(--glass-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--glass-border);
  padding: 3rem;
  border-radius: 24px;
  width: 90%;
  max-width: 700px;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  box-shadow: var(--glass-shadow);
  transform: scale(0.95) translateY(20px);
  transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.modal.active .modal-content {
  transform: scale(1) translateY(0);
}

.close-btn {
  position: absolute;
  top: 1.5rem; right: 1.5rem;
  background: none; border: none;
  color: var(--text-muted);
  font-size: 1.5rem; cursor: pointer;
  transition: color 0.3s;
}
.close-btn:hover { color: var(--text-main); }

.form-group { margin-bottom: 1.5rem; display: flex; flex-direction: column; gap: 0.5rem; }
.form-group label { font-size: 0.85rem; color: var(--text-muted); font-weight: 500; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }

/* 滚动条美化 */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--glass-border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

footer {
  text-align: center;
  padding: 3rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: auto;
}