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

:root {
  --primary: #4F6EF7;
  --primary-dark: #3B57DB;
  --danger: #E74C3C;
  --danger-dark: #C0392B;
  --success: #27AE60;
  --warning: #F39C12;
  --bg: #F5F7FB;
  --card-bg: #FFFFFF;
  --border: #E1E5EC;
  --text: #2C3E50;
  --text-secondary: #7F8C9B;
  --text-muted: #A0AEC0;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  --radius: 12px;
  --radius-sm: 8px;
}

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

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

/* ===== 头部 ===== */
.header {
  text-align: center;
  padding: 36px 0 20px;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 6px;
}

.logo h1 {
  font-size: 26px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.5px;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 16px;
}

.server-info {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

.badge {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
  background: #EEF1FD;
  color: var(--primary);
  border: 1px solid #DCE0FC;
}

/* ===== 上传区域 ===== */
.upload-section {
  margin-bottom: 24px;
}

.upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.25s ease;
  background: var(--card-bg);
}

.upload-area:hover,
.upload-area.drag-over {
  border-color: var(--primary);
  background: #F8F9FE;
}

.upload-area.drag-over {
  border-style: solid;
  box-shadow: 0 0 0 4px rgba(79, 110, 247, 0.1);
}

.upload-icon {
  margin-bottom: 12px;
}

.upload-text {
  font-size: 16px;
  color: var(--text);
  margin-bottom: 6px;
}

.browse-link {
  color: var(--primary);
  font-weight: 600;
  text-decoration: underline;
  cursor: pointer;
}

.upload-hint {
  font-size: 13px;
  color: var(--text-muted);
}

/* ===== 上传进度 ===== */
.upload-progress {
  margin-top: 16px;
  padding: 16px;
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
}

.progress-bar-wrapper {
  height: 6px;
  background: #E9ECF5;
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 8px;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), #7B93F7);
  border-radius: 3px;
  width: 0%;
  transition: width 0.3s ease;
}

.progress-text {
  font-size: 13px;
  color: var(--text-secondary);
  text-align: center;
}

/* ===== 上传结果 ===== */
.upload-result {
  margin-top: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
}

.upload-result.success {
  background: #E8F8F0;
  color: var(--success);
  border: 1px solid #C8EBD8;
}

.upload-result.error {
  background: #FDEDEC;
  color: var(--danger);
  border: 1px solid #FADBD8;
}

/* ===== 文件列表 ===== */
.file-list-section {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border);
}

.section-header h2 {
  font-size: 18px;
  font-weight: 600;
}

.section-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.file-count {
  font-size: 13px;
  color: var(--text-secondary);
}

.btn-refresh {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card-bg);
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}

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

/* ===== 空状态 ===== */
.empty-state {
  text-align: center;
  padding: 60px 24px;
  color: var(--text-muted);
}

.empty-state p {
  margin-top: 12px;
  font-size: 15px;
}

.empty-hint {
  font-size: 13px !important;
  color: var(--text-muted);
}

/* ===== 文件列表项 ===== */
.list-header {
  display: grid;
  grid-template-columns: 2fr 1fr 1.2fr 1fr 100px;
  gap: 12px;
  padding: 10px 24px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: #FAFBFD;
  border-bottom: 1px solid var(--border);
}

.file-item {
  display: grid;
  grid-template-columns: 2fr 1fr 1.2fr 1fr 100px;
  gap: 12px;
  align-items: center;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s;
}

.file-item:last-child {
  border-bottom: none;
}

.file-item:hover {
  background: #F8F9FE;
}

.file-name {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  background: #EEF1FD;
  color: var(--primary);
  flex-shrink: 0;
  font-size: 12px;
  font-weight: 600;
}

.file-size {
  font-size: 13px;
  color: var(--text-secondary);
}

.file-time {
  font-size: 13px;
  color: var(--text-secondary);
}

.file-expire {
  font-size: 13px;
}

.file-expire.normal { color: var(--text-secondary); }
.file-expire.warning { color: var(--warning); font-weight: 600; }
.file-expire.danger  { color: var(--danger);  font-weight: 600; }

.file-actions {
  display: flex;
  gap: 6px;
}

.btn-download, .btn-delete {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  cursor: pointer;
  transition: all 0.2s;
  color: var(--text-secondary);
}

.btn-download:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: #EEF1FD;
}

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

/* ===== 加载动画 ===== */
.loading-state {
  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); }
}

/* ===== 弹窗 ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.2s ease;
}

.modal {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 28px 32px;
  max-width: 400px;
  width: 90%;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}

.modal h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.modal p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.modal-hint {
  font-size: 12px !important;
  color: var(--text-muted) !important;
  margin-bottom: 20px !important;
}

.modal-buttons {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

.btn-cancel {
  padding: 8px 20px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card-bg);
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-cancel:hover {
  background: #F5F7FB;
}

.btn-confirm {
  padding: 8px 20px;
  border: none;
  border-radius: 6px;
  background: var(--danger);
  color: white;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-confirm:hover {
  background: var(--danger-dark);
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 14px;
  z-index: 2000;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
  animation: slideDown 0.3s ease;
  white-space: nowrap;
}

.toast.success { background: #E8F8F0; color: var(--success); border: 1px solid #C8EBD8; }
.toast.error   { background: #FDEDEC; color: var(--danger);  border: 1px solid #FADBD8; }
.toast.info    { background: #EEF1FD; color: var(--primary); border: 1px solid #DCE0FC; }

@keyframes fadeIn  { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideDown { from { opacity: 0; transform: translateX(-50%) translateY(-12px); } to { opacity: 1; transform: translateX(-50%) translateY(0); } }

/* ===== 底部 ===== */
.footer {
  text-align: center;
  padding: 32px 0 12px;
  color: var(--text-muted);
  font-size: 12px;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .list-header { display: none; }

  .file-item {
    grid-template-columns: 1fr auto;
    gap: 6px;
    padding: 16px;
  }

  .file-name {
    grid-column: 1 / -1;
  }

  .file-size, .file-time, .file-expire {
    font-size: 12px;
    grid-column: auto;
  }

  .file-actions {
    grid-column: 2;
    grid-row: 2 / 5;
    flex-direction: column;
    justify-content: center;
  }

  .logo h1 { font-size: 22px; }
  .upload-area { padding: 32px 16px; }
}