/* ===== 布局 ===== */

#app {
  min-height: 100vh;
  display: flex;
}

/* 屏幕切换 */
.screen {
  display: none;
  width: 100%;
  min-height: 100vh;
}

.screen.active {
  display: flex;
}

/* ===== 登录界面 ===== */
#auth-screen {
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-accent-light) 100%);
}

.auth-container {
  width: 100%;
  max-width: 380px;
}

.auth-card {
  padding: var(--space-2xl);
  text-align: center;
  animation: fadeInUp 0.5s ease;
}

.app-title {
  font-size: 42px;
  color: var(--color-accent-dark);
  margin-bottom: var(--space-sm);
}

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

#auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

#password-input {
  text-align: center;
  font-size: 16px;
}

.auth-hint {
  font-size: 12px;
  color: var(--color-error);
  min-height: 18px;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 主界面布局 ===== */
#main-screen {
  flex-direction: row;
}

/* 侧边栏 */
.sidebar {
  width: var(--sidebar-width);
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: width var(--transition-base);
  z-index: 100;
}

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

.sidebar-header h2 {
  font-size: 24px;
  color: var(--color-accent-dark);
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-lg) 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  margin: 0 var(--space-sm);
  border-radius: var(--radius-md);
  color: var(--color-text);
  text-decoration: none;
  font-size: 14px;
  transition: all var(--transition-fast);
  cursor: pointer;
  background: none;
  border: none;
  width: calc(100% - var(--space-lg));
}

.nav-item:hover {
  background: var(--color-surface-hover);
}

.nav-item.active {
  background: var(--color-accent-light);
  color: var(--color-accent-dark);
}

.nav-icon {
  font-size: 20px;
  width: 28px;
  text-align: center;
}

.sidebar-footer {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

/* 内容区 */
.content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-xl);
  background: var(--color-bg);
}

/* ===== 模态框 ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--space-xl);
  backdrop-filter: blur(4px);
}

.modal {
  width: 100%;
  max-width: 480px;
  max-height: 80vh;
  overflow-y: auto;
  animation: modalIn 0.3s ease;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.modal-header h3 {
  font-family: var(--font-display);
  font-size: 18px;
}

.modal-body {
  padding: var(--space-xl);
}

.modal-footer {
  padding: var(--space-lg) var(--space-xl);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: flex-end;
  gap: var(--space-md);
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* 冲突模态框 */
.conflict-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.btn-option {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-xs);
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  width: 100%;
}

.btn-option:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
}

.btn-option strong {
  font-size: 16px;
}

.btn-option span {
  font-size: 12px;
  color: var(--color-text-secondary);
}

/* ===== Toast 通知 ===== */
.toast-container {
  position: fixed;
  top: var(--space-xl);
  right: var(--space-xl);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  pointer-events: none;
}

.toast {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  font-size: 14px;
  box-shadow: var(--shadow-lg);
  animation: toastIn 0.3s ease;
  pointer-events: auto;
  max-width: 300px;
}

.toast.success {
  background: var(--color-success);
  color: white;
}

.toast.error {
  background: var(--color-error);
  color: white;
}

.toast.warning {
  background: var(--color-warning);
  color: var(--color-text);
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  :root {
    --sidebar-width: 0;
  }

  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
  }

  .sidebar.open {
    transform: translateX(0);
    width: 220px;
  }

  .content {
    padding: var(--space-lg);
  }

  .modal-overlay {
    padding: var(--space-md);
  }
}