/* ============================================================
   Liquid Glass 设计系统 — 校园AI助手全站统一样式
   提取自 chat.html，品牌色 #7B61FF (紫)
   ============================================================ */

/* ========== CSS 自定义属性 ========== */
:root {
  --bg: #F7F7FA;
  --bg-card: rgba(255,255,255,0.5);
  --bg-input: rgba(120,120,140,0.06);
  --text: #1D1D1F;
  --text-secondary: #6E6E73;
  --text-muted: #8E8E93;
  --border: rgba(0,0,0,0.06);
  --border-light: rgba(0,0,0,0.03);
  --glass-border: rgba(255,255,255,0.6);
  --glass-bg: rgba(255,255,255,0.45);
  --glass-blur: blur(24px) saturate(160%);
  --shadow: 0 1px 4px rgba(0,0,0,0.03);
  --shadow-lg: 0 4px 20px rgba(0,0,0,0.05);
  --primary: #7B61FF;
  --primary-light: rgba(123,97,255,0.08);
  --primary-gradient: linear-gradient(135deg, #7B61FF, #4A90FF);
  --accent-gradient: linear-gradient(135deg, #7B61FF, #A78BFA);
  --toast-bg: #1D1D1F;
  --toast-text: #ffffff;
  --hover-bg: rgba(0,0,0,0.03);
  --green-bg: rgba(52,199,89,0.1);
  --green-text: #34c759;
  --orange-bg: rgba(255,149,0,0.1);
  --orange-text: #f59e4b;
  --danger-bg: rgba(255,59,48,0.1);
  --danger-text: #ff3b30;
  --success: #34c759;
  --warning: #ff9500;
  --danger: #ff3b30;
  --card-bg: rgba(255,255,255,0.6);
  --input-bg: rgba(120,120,140,0.06);
  --success-bg: rgba(52,199,89,0.1);
  --success-light: rgba(52,199,89,0.06);
  --warning-light: rgba(255,149,0,0.06);
  --danger-light: rgba(255,59,48,0.06);
  --tag-kb: rgba(123,97,255,0.1);
  --tag-kb-text: #7B61FF;
  --tag-rule: rgba(52,199,89,0.1);
  --tag-rule-text: #34c759;
  --tag-img: rgba(255,149,0,0.1);
  --tag-img-text: #f59e4b;
  --purple: #7B61FF;
  --cyan: #4A90FF;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --press-bg: rgba(0,0,0,0.04);
  --tag-bg: rgba(120,120,140,0.08);
  --primary-soft: rgba(123,97,255,0.06);
  --divider: rgba(0,0,0,0.06);
  --toggle-bg: rgba(120,120,140,0.08);
  --topbar-height: 48px;
}

[data-theme="dark"] {
  --bg: #0F0F15;
  --bg-card: rgba(30,28,40,0.55);
  --bg-input: rgba(120,120,140,0.12);
  --text: #F5F5F7;
  --text-secondary: #98989D;
  --text-muted: #5C5C64;
  --border: rgba(255,255,255,0.06);
  --border-light: rgba(255,255,255,0.03);
  --glass-border: rgba(255,255,255,0.06);
  --glass-bg: rgba(30,28,40,0.5);
  --glass-blur: blur(24px) saturate(120%);
  --shadow: 0 1px 4px rgba(0,0,0,0.15);
  --shadow-lg: 0 4px 20px rgba(0,0,0,0.25);
  --primary: #8B7AFF;
  --primary-light: rgba(139,122,255,0.12);
  --primary-gradient: linear-gradient(135deg, #8B7AFF, #5AA0FF);
  --toast-bg: #3A3A40;
  --toast-text: #ffffff;
  --hover-bg: rgba(255,255,255,0.04);
  --green-bg: rgba(52,199,89,0.12);
  --green-text: #30d158;
  --orange-bg: rgba(255,159,10,0.12);
  --orange-text: #ff9f0a;
  --danger-bg: rgba(255,69,58,0.12);
  --danger-text: #ff453a;
  --success: #30d158;
  --warning: #ff9f0a;
  --danger: #ff453a;
  --card-bg: rgba(30,28,40,0.6);
  --input-bg: rgba(120,120,140,0.12);
  --success-bg: rgba(52,199,89,0.12);
  --success-light: rgba(52,199,89,0.08);
  --warning-light: rgba(255,159,10,0.08);
  --danger-light: rgba(255,69,58,0.08);
  --tag-kb: rgba(139,122,255,0.14);
  --tag-kb-text: #8B7AFF;
  --tag-rule: rgba(48,209,88,0.14);
  --tag-rule-text: #30d158;
  --tag-img: rgba(255,159,10,0.14);
  --tag-img-text: #ff9f0a;
  --purple: #8B7AFF;
  --cyan: #5AA0FF;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.35);
  --press-bg: rgba(255,255,255,0.04);
  --tag-bg: rgba(120,120,140,0.14);
  --primary-soft: rgba(139,122,255,0.08);
  --divider: rgba(255,255,255,0.06);
  --toggle-bg: rgba(120,120,140,0.14);
}

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

html { height: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', sans-serif;
  background: linear-gradient(180deg, #E8F0FE 0%, #F7F7FA 40%, #FFFFFF 100%);
  color: var(--text);
  min-height: 100vh;
  transition: background 0.5s ease, color 0.5s ease;
  position: relative;
}

[data-theme="dark"] body {
  background: linear-gradient(180deg, #181828 0%, #0F0F15 40%, #0A0A0F 100%);
}

/* 环境光球 (ambient light orbs) */
body::before {
  content: '';
  position: fixed; width: 280px; height: 280px; border-radius: 50%;
  filter: blur(140px); opacity: 0.25; background: #D8D0FF;
  top: -100px; left: -60px; z-index: -1;
  animation: lightShift 12s infinite alternate ease-in-out;
  pointer-events: none;
}
body::after {
  content: '';
  position: fixed; width: 200px; height: 200px; border-radius: 50%;
  filter: blur(140px); opacity: 0.2; background: #C0D8FF;
  bottom: -40px; right: -40px; z-index: -1;
  animation: lightShift 12s -6s infinite alternate ease-in-out;
  pointer-events: none;
}

@keyframes lightShift {
  0% { transform: translate(0,0) scale(1); }
  50% { transform: translate(15px,-8px) scale(1.06); }
  100% { transform: translate(-6px,10px) scale(0.94); }
}

/* ========== 玻璃态卡片 ========== */
.card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow);
  transition: all 0.2s cubic-bezier(0.25,0.1,0.25,1);
}
.card:hover {
  box-shadow: var(--shadow-lg);
  border-color: rgba(123,97,255,0.2);
}

/* ========== 输入框 ========== */
.input-field {
  width: 100%; padding: 12px 14px; border-radius: 12px; font-size: 14px;
  background: var(--bg-input); border: 2px solid var(--border); color: var(--text);
  outline: none; margin-bottom: 8px; transition: border-color 0.2s;
  font-family: inherit;
}
.input-field:focus { border-color: var(--primary); }
.input-field::placeholder { color: var(--text-muted); }

/* ========== 按钮系统 ========== */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 20px; border-radius: 14px; border: none;
  font-size: 14px; font-weight: 500; cursor: pointer;
  transition: all 0.2s; font-family: inherit;
  text-decoration: none; justify-content: center;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--primary-gradient); color: #fff;
  box-shadow: 0 2px 8px rgba(123,97,255,0.3);
}
.btn-primary:hover { opacity: 0.9; box-shadow: 0 4px 14px rgba(123,97,255,0.4); }

.btn-danger {
  background: var(--danger-bg); color: var(--danger-text);
}
.btn-danger:hover { opacity: 0.85; }

.btn-outline {
  background: var(--bg-input); color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

.btn-ghost {
  background: transparent; color: var(--text-muted);
}
.btn-ghost:hover { background: var(--hover-bg); color: var(--text); }

.btn-sm { padding: 6px 14px; font-size: 12px; border-radius: 10px; }
.btn-xs { padding: 3px 10px; font-size: 11px; border-radius: 8px; }

/* ========== 徽章 ========== */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 10px; border-radius: 100px; font-size: 11px;
  font-weight: 500; white-space: nowrap;
}
.badge-primary { background: var(--primary-light); color: var(--primary); }
.badge-success { background: var(--green-bg); color: var(--green-text); }
.badge-warning { background: var(--orange-bg); color: var(--orange-text); }
.badge-danger { background: var(--danger-bg); color: var(--danger-text); }

/* ========== Toast 通知 (灵动岛风格) ========== */
.toast-container {
  position: fixed; top: 12px; left: 50%; transform: translateX(-50%);
  z-index: 200; display: flex; flex-direction: column; gap: 8px;
  pointer-events: none;
}
.toast {
  padding: 10px 22px; border-radius: 24px; font-size: 13px; font-weight: 500;
  color: var(--toast-text); background: var(--toast-bg);
  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
  animation: toastIn 0.5s cubic-bezier(0.34,1.56,0.64,1);
  pointer-events: auto; white-space: nowrap; min-width: 100px; text-align: center;
}
.toast.success { background: #1c1c1e; color: #30d158; }
.toast.error { background: #1c1c1e; color: #ff453a; }
@keyframes toastIn {
  0% { opacity: 0; transform: translateY(-20px) scale(0.85); }
  60% { transform: translateY(2px) scale(1.02); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

/* ========== 主题切换按钮 ========== */
.theme-toggle {
  position: fixed; top: 16px; right: 16px; z-index: 80;
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  cursor: pointer; font-size: 16px; display: flex;
  align-items: center; justify-content: center;
  transition: all 0.2s;
}
.theme-toggle:hover { box-shadow: var(--shadow-lg); }

/* ========== 弹窗/Modal ========== */
.modal-overlay {
  position: fixed; inset: 0; z-index: 100; background: rgba(0,0,0,0.4);
  backdrop-filter: blur(4px); display: flex; align-items: center; justify-content: center;
  padding: 20px; animation: fadeIn 0.2s ease;
}
.modal-card {
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: 24px; padding: 24px;
  max-width: 420px; width: 100%; max-height: 80vh; overflow-y: auto;
  box-shadow: var(--shadow-lg); animation: slideUp 0.35s cubic-bezier(0.4,0,0.2,1);
}
.modal-card.wide { max-width: 600px; }
.modal-header { display: flex; align-items: center; gap: 4px; margin-bottom: 16px; }
.modal-title { font-size: 18px; font-weight: 700; color: var(--text); display: flex; align-items: center; gap: 8px; }
.modal-close {
  width: 32px; height: 32px; border-radius: 10px; border: none;
  background: var(--bg-input); color: var(--text-muted);
  cursor: pointer; font-size: 16px; transition: all 0.2s;
  margin-left: auto;
}
.modal-close:hover { background: var(--border); color: var(--text); }
.hidden { display: none !important; }

/* ========== 补充 Class（admin 页面通用） ========== */
.btn-success { background: var(--success-bg); color: var(--success); }
.btn-success:hover { opacity: 0.85; }
.btn-purple { background: var(--primary-light); color: var(--primary); }
.btn-purple:hover { background: var(--primary); color: #fff; }
.btn-approve { background: var(--success-bg); color: var(--success); border: none; padding: 6px 14px; border-radius: 10px; font-size: 12px; cursor: pointer; font-weight: 500; }
.btn-reject { background: var(--danger-bg); color: var(--danger); border: none; padding: 6px 14px; border-radius: 10px; font-size: 12px; cursor: pointer; font-weight: 500; }
.drop-zone { border: 2px dashed var(--border); border-radius: 14px; padding: 24px; text-align: center; cursor: pointer; transition: all 0.2s; background: var(--bg-input); }
.drop-zone:hover { border-color: var(--primary); background: var(--primary-soft); }
.action-link { color: var(--primary); cursor: pointer; font-size: 12px; font-weight: 500; text-decoration: none; }
.action-link:hover { opacity: 0.8; }
.action-link.danger { color: var(--danger); }
.result-box { background: var(--bg-input); border-radius: 12px; padding: 16px; margin-bottom: 12px; font-size: 13px; line-height: 1.6; }
.card-hint { font-size: 12px; color: var(--text-muted); margin-top: 6px; }
.search-input { width: 100%; padding: 10px 14px; border-radius: 12px; border: 2px solid var(--border); background: var(--bg-input); color: var(--text); font-size: 14px; outline: none; font-family: inherit; }
.search-input:focus { border-color: var(--primary); }
.rule-row { display: flex; align-items: center; gap: 10px; padding: 12px; background: var(--card-bg); border-radius: 12px; margin-bottom: 8px; border: 1px solid var(--border); }
.teacher-row, .student-row { display: flex; align-items: center; gap: 12px; padding: 12px; background: var(--card-bg); border-radius: 12px; margin-bottom: 8px; border: 1px solid var(--border); }
.teacher-info, .student-info { flex: 1; min-width: 0; }
.teacher-name, .student-name { font-size: 14px; font-weight: 600; color: var(--text); }
.teacher-id, .student-id { font-size: 11px; color: var(--text-muted); }
.teacher-class, .student-class { font-size: 12px; color: var(--text-secondary); }
.teacher-actions, .student-actions { display: flex; gap: 6px; flex-shrink: 0; }
.upload-row { display: flex; align-items: center; gap: 12px; padding: 10px; background: var(--card-bg); border-radius: 10px; margin-bottom: 6px; }
.upload-name { font-size: 13px; font-weight: 500; color: var(--text); flex: 1; }
.upload-meta { font-size: 11px; color: var(--text-muted); }
.loc-coord { font-size: 11px; color: var(--text-muted); font-family: monospace; margin-top: 2px; }
.badge-info { background: var(--primary-light); color: var(--primary); }
.feedback-item { padding: 14px; background: var(--card-bg); border-radius: 12px; margin-bottom: 10px; border: 1px solid var(--border); }
.feedback-item .feedback-meta { font-size: 11px; color: var(--text-muted); margin-top: 6px; }
.selected { border-color: var(--primary) !important; box-shadow: 0 0 0 3px var(--primary-light); }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(20px); } }
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* ========== 页面头部 ========== */
.header {
  display: flex; align-items: center; gap: 12px; margin-bottom: 20px; padding-bottom: 8px;
}
.back-btn {
  width: 36px; height: 36px; border-radius: 10px; border: none;
  background: var(--glass-bg); color: var(--text-secondary);
  font-size: 18px; cursor: pointer; transition: all 0.2s;
  display: flex; align-items: center; justify-content: center;
  text-decoration: none;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
}
.back-btn:hover { background: var(--hover-bg); color: var(--text); }
.page-title { font-size: 20px; font-weight: 700; color: var(--text); letter-spacing: -0.02em; }
.page-subtitle { font-size: 13px; color: var(--text-muted); margin-top: 2px; }

/* ========== 标签页 ========== */
.tabs {
  display: flex; gap: 6px; margin-bottom: 16px;
  background: var(--bg-input); border-radius: 12px; padding: 4px;
}
.tab {
  flex: 1; padding: 8px 12px; border-radius: 10px; border: none;
  background: transparent; color: var(--text-muted);
  font-size: 13px; font-weight: 500; cursor: pointer;
  transition: all 0.2s; text-align: center; font-family: inherit;
}
.tab.active { background: #fff; color: var(--text); box-shadow: var(--shadow); }
[data-theme="dark"] .tab.active { background: rgba(255,255,255,0.1); }

/* ========== 空状态 ========== */
.empty-state {
  text-align: center; padding: 40px 20px;
  color: var(--text-muted); font-size: 14px;
}
.empty-state-icon { font-size: 48px; margin-bottom: 12px; opacity: 0.6; }

/* ========== 统计卡片网格 ========== */
.stat-row { display: flex; gap: 10px; margin-bottom: 16px; }
.stat-card {
  flex: 1; background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 16px; padding: 16px; text-align: center;
  box-shadow: var(--shadow);
}
.stat-val { font-size: 24px; font-weight: 700; color: var(--primary); }
.stat-label { font-size: 11px; color: var(--text-muted); margin-top: 2px; }

/* ========== 响应式 ========== */
@media (max-width: 480px) {
  body { font-size: 14px; }
  .modal-overlay { padding: 12px; align-items: center; }
  .modal-card { border-radius: 24px; max-height: 85vh; padding: 20px; }
  .card { padding: 16px; }
  .stat-row { flex-wrap: wrap; }
  .stat-card { min-width: calc(50% - 6px); }
}