/**
 * 客课帮视频平台 - 全局样式
 */

:root {
  --primary: #FF6B35;
  --primary-dark: #E55A2B;
  --bg: #0A0A0F;
  --card: #13131A;
  --card-hover: #1A1A24;
  --border: #22222E;
  --text: #FFFFFF;
  --text-secondary: #8888A0;
  --text-muted: #55556A;
  --success: #22C55E;
  --danger: #EF4444;
  --warning: #F59E0B;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

/* === 登录页 === */
.login-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: radial-gradient(ellipse at top, #1a0a0520 0%, transparent 60%);
}

.login-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 48px 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}

.login-logo {
  text-align: center;
  margin-bottom: 36px;
}

.login-logo h1 {
  font-size: 28px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: 2px;
  margin-bottom: 4px;
}

.login-logo p {
  color: var(--text-secondary);
  font-size: 14px;
}

.login-logo span { color: var(--primary); }

.login-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 28px;
}

.form-group { margin-bottom: 18px; }

.form-group label {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 6px;
  font-weight: 500;
}

.form-input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  color: var(--text);
  font-size: 16px;
  transition: border-color 0.2s;
  outline: none;
  font-family: inherit;
}

.form-input:focus { border-color: var(--primary); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
  width: 100%;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-primary:active { transform: scale(0.98); }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  width: auto;
}

.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }

.btn-danger { background: var(--danger); color: white; }
.btn-sm { padding: 8px 16px; font-size: 13px; width: auto; }

.error-msg {
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.3);
  border-radius: 8px;
  padding: 12px 16px;
  color: var(--danger);
  font-size: 13px;
  margin-bottom: 16px;
  display: none;
}

.success-msg {
  background: rgba(34,197,94,0.1);
  border: 1px solid rgba(34,197,94,0.3);
  border-radius: 8px;
  padding: 12px 16px;
  color: var(--success);
  font-size: 13px;
  margin-bottom: 16px;
  display: none;
}

/* === 通用页头 === */
.header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-brand {
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
}

.header-brand span { color: var(--primary); }

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-phone {
  font-size: 14px;
  color: var(--text-secondary);
  background: var(--bg);
  padding: 6px 12px;
  border-radius: 20px;
  border: 1px solid var(--border);
}

.btn-logout {
  font-size: 13px;
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 6px;
  transition: color 0.2s;
}

.btn-logout:hover { color: var(--danger); }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 24px;
}

.page-title { font-size: 24px; font-weight: 700; margin-bottom: 8px; }
.page-subtitle { color: var(--text-secondary); font-size: 14px; margin-bottom: 32px; }

/* === 视频网格 === */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.video-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  transition: all 0.2s;
  cursor: pointer;
}

.video-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(255,107,53,0.1);
}

.video-cover {
  position: relative;
  aspect-ratio: 16/9;
  background: #1a1a2e;
  overflow: hidden;
}

.video-cover img { width: 100%; height: 100%; object-fit: cover; }

.video-cover-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  color: var(--text-muted);
}

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.8);
  color: white;
  font-size: 12px;
  padding: 2px 6px;
  border-radius: 4px;
}

.video-info { padding: 16px; }

.video-category {
  font-size: 11px;
  color: var(--primary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.video-title {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 6px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-desc {
  font-size: 12px;
  color: var(--text-muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.video-views { font-size: 12px; color: var(--text-muted); }
.video-play-btn { font-size: 12px; color: var(--primary); font-weight: 600; }

/* === 视频播放 === */
.player-container { max-width: 900px; margin: 0 auto; }

.video-player {
  aspect-ratio: 16/9;
  background: #000;
  border-radius: 14px;
  overflow: hidden;
  margin-bottom: 20px;
}

video { width: 100%; height: 100%; outline: none; }

.player-info {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
}

.player-info h2 { font-size: 20px; margin-bottom: 8px; }
.player-info .player-category { font-size: 12px; color: var(--primary); margin-bottom: 12px; }
.player-info p { color: var(--text-secondary); font-size: 14px; line-height: 1.7; }

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  margin-bottom: 20px;
  padding: 8px 0;
}

.back-link:hover { color: var(--primary); }

/* === 管理后台 === */
.admin-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.admin-tabs { display: flex; gap: 4px; }

.admin-tab {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  color: var(--text-secondary);
  background: none;
  border: none;
  transition: all 0.2s;
  font-family: inherit;
}

.admin-tab:hover { color: var(--text); background: var(--bg); }
.admin-tab.active { background: var(--primary); color: white; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}

.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

.stat-value { font-size: 28px; font-weight: 800; color: var(--primary); margin-bottom: 4px; }
.stat-label { font-size: 13px; color: var(--text-secondary); }

/* === 表格 === */
.table-wrapper {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
}

.table-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.table-title { font-size: 15px; font-weight: 600; }

table { width: 100%; border-collapse: collapse; }

th {
  text-align: left;
  padding: 12px 20px;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

td {
  padding: 14px 20px;
  font-size: 14px;
  border-bottom: 1px solid rgba(34,34,46,0.5);
  vertical-align: middle;
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(255,107,53,0.03); }

.badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
}

.badge-active { background: rgba(34,197,94,0.15); color: var(--success); }
.badge-locked { background: rgba(239,68,68,0.15); color: var(--danger); }
.badge-new { background: rgba(245,158,11,0.15); color: var(--warning); }

.action-btns { display: flex; gap: 6px; }

/* === 模态框 === */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

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

.modal {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-title { font-size: 18px; font-weight: 700; margin-bottom: 20px; }
.modal-footer { display: flex; gap: 10px; margin-top: 20px; }

/* === 上传区 === */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 40px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 16px;
}

.upload-zone:hover { border-color: var(--primary); background: rgba(255,107,53,0.05); }
.upload-zone.dragover { border-color: var(--primary); background: rgba(255,107,53,0.1); }
.upload-icon { font-size: 36px; margin-bottom: 12px; }
.upload-text { font-size: 14px; color: var(--text-secondary); }
.upload-text strong { color: var(--primary); }

/* === 空状态 === */
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-muted); }
.empty-icon { font-size: 48px; margin-bottom: 16px; }

/* === 加载 === */
.loading { text-align: center; padding: 40px; color: var(--text-muted); }

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 12px;
}

@keyframes spin { to { transform: rotate(360deg); } }

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

.video-card { animation: fadeIn 0.3s ease-out; }

/* === 进度条 === */
.upload-progress {
  background: var(--bg);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
  display: none;
}

.progress-bar-bg {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin-top: 8px;
}

.progress-bar-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 3px;
  transition: width 0.3s;
  width: 0%;
}

/* === 响应式 === */
@media (max-width: 768px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .login-card { padding: 32px 24px; }
  .admin-tabs { gap: 2px; }
  .admin-tab { padding: 8px 10px; font-size: 13px; }
}