/* ============================================================================
   Main Styles - 创大国际记账机器人 Web Frontend
   ============================================================================ */

/* CSS Variables */
:root {
    /* Colors */
    --primary-color: #1890ff;
    --primary-hover: #40a9ff;
    --primary-dark: #096dd9;
    --success-color: #52c41a;
    --warning-color: #faad14;
    --error-color: #ff4d4f;
    --info-color: #1890ff;
    
    /* Text colors */
    --text-primary: #262626;
    --text-secondary: #595959;
    --text-muted: #8c8c8c;
    --text-disabled: #bfbfbf;
    
    /* Background colors */
    --bg-primary: #ffffff;
    --bg-secondary: #fafafa;
    --bg-tertiary: #f5f5f5;
    --bg-dark: #001529;
    
    /* Border colors */
    --border-color: #d9d9d9;
    --border-light: #f0f0f0;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    
    /* Layout */
    --sidebar-width: 240px;
    --header-height: 64px;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 14px;
    line-height: 1.5;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    min-height: 100vh;
}

a {
    color: var(--primary-color);
    text-decoration: none;
}

a:hover {
    color: var(--primary-hover);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
}

/* Layout */
#app {
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.page {
    padding: var(--spacing-lg);
}

/* Loading */
.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    color: var(--text-secondary);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

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

/* Admin Layout */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

.admin-sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-dark);
    color: #fff;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    overflow-y: auto;
}

.admin-sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.admin-sidebar-header h1 {
    font-size: 1.125rem;
    margin: 0;
    color: #fff;
}

.admin-sidebar-nav {
    padding: var(--spacing-md) 0;
}

.admin-nav-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    color: rgba(255, 255, 255, 0.65);
    cursor: pointer;
    transition: var(--transition-fast);
}

.admin-nav-item:hover {
    color: #fff;
    background-color: rgba(255, 255, 255, 0.05);
}

.admin-nav-item.active {
    color: #fff;
    background-color: var(--primary-color);
}

.admin-nav-item svg {
    width: 20px;
    height: 20px;
    margin-right: var(--spacing-sm);
}

.admin-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    background-color: var(--bg-secondary);
}

.admin-header {
    height: var(--header-height);
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: 100;
}

.admin-header-title {
    font-size: 1.125rem;
    font-weight: 600;
}

.admin-header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

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

/* Bill Page Layout */
.bill-page {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

.bill-header {
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.bill-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.bill-subtitle {
    color: var(--text-secondary);
}

/* Toast Notifications */
#toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    animation: slideIn 0.3s ease;
    max-width: 400px;
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--error-color);
}

.toast.warning {
    border-left: 4px solid var(--warning-color);
}

.toast.info {
    border-left: 4px solid var(--info-color);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Responsive */
@media (max-width: 768px) {
    :root {
        --sidebar-width: 0;
    }
    
    .admin-sidebar {
        transform: translateX(-100%);
        transition: var(--transition-normal);
        z-index: 1000;
    }
    
    .admin-sidebar.open {
        transform: translateX(0);
        width: 240px;
    }
    
    .admin-main {
        margin-left: 0;
    }
    
    .bill-page {
        padding: var(--spacing-md);
    }
}