/* 全局CSS变量 */
:root {
    --primary-color: #0088ff;
    --primary-hover: #0056b3;
    --secondary-color: #00c6ff;
    --text-color: #495057;
    --light-text: #6c757d;
    --border-color: #ced4da;
    --bg-gradient-start: #f5f7fa;
    --bg-gradient-end: #c3cfe2;
    --card-shadow: 0 15px 30px rgba(0,0,0,0.1);
    --input-shadow: 0 0 0 0.2rem rgba(0,123,255,.25);
    --btn-shadow: 0 5px 15px rgba(0,123,255,0.4);
    --danger-bg: #f8d7da;
    --danger-text: #721c24;
    --success-bg: #d4edda;
    --success-text: #155724;
}

/* General Body Styles */
body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    color: var(--text-color);
    margin: 0;
    min-height: 100vh;
}

/* Navbar Customization */
.navbar {
    box-shadow: var(--card-shadow);
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color)) !important;
    padding: 0 2rem;
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.navbar .logo {
    font-size: 1.5rem;
    font-weight: bold;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.2);
}

.navbar a {
    color: rgba(255,255,255,0.85);
    text-decoration: none;
    font-size: 1.1rem;
    margin-right: 1.5rem;
    transition: all 0.3s ease;
}

.navbar a:hover {
    color: #fff;
    transform: translateY(-2px);
}

/* Main Container */
.main-container {
    padding: 80px 2rem 2rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* Page Title */
.page-title {
    font-size: 2rem;
    font-weight: 300;
    margin-bottom: 2rem;
    color: var(--text-color);
}

/* Card Styles */
.card {
    background-color: white;
    border: none;
    box-shadow: var(--card-shadow);
    margin-bottom: 1.5rem;
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.card-header {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    font-weight: bold;
    border-bottom: none;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid #eee;
    margin-bottom: 1rem;
}

.card-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 0;
}

.card-subtitle {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-top: 0.5rem;
}

.card-content {
    padding: 1.5rem;
    height: 350px;
}

/* Dashboard Grid */
.dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

/* Table Styles */
.table-container {
    background-color: white;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    padding: 1.5rem;
    overflow: hidden;
}

.table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

th {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 12px 15px;
    text-align: left;
    font-weight: 600;
    white-space: nowrap;
}

td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
    vertical-align: middle;
}

tbody tr:hover {
    background-color: rgba(0,136,255,0.05);
    transform: scale(1.01);
    transition: all 0.2s;
}

/* Button Styles */
.button {
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 10px 15px;
    text-decoration: none;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    transition: all 0.3s;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    display: inline-block;
    margin: 0 2px;
}

.button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.15);
    text-decoration: none;
    color: white;
}

.button-edit {
    background: linear-gradient(45deg, #ffc107, #ffdb58);
    color: #212529;
}

.button-edit:hover {
    background: linear-gradient(45deg, #e0a800, #ffc107);
    color: #212529;
}

.button-delete {
    background: linear-gradient(45deg, #dc3545, #f55a4e);
}

.button-delete:hover {
    background: linear-gradient(45deg, #c82333, #dc3545);
}

.button-success {
    background: linear-gradient(45deg, #28a745, #5cb85c);
}

.button-success:hover {
    background: linear-gradient(45deg, #1e7e34, #28a745);
}

/* Form Styles */
.form-container {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    max-width: 500px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
    position: relative;
}

.form-group label {
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    display: block;
}

.form-control {
    width: 100%;
    height: 48px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.3s;
    font-size: 1rem;
    padding: 0 15px;
    box-sizing: border-box;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: var(--input-shadow);
    outline: none;
}

.form-control::placeholder {
    color: #adb5bd;
    opacity: 0.8;
}

/* Alert Messages */
.alert {
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 8px;
    border: none;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    animation: fadeIn 0.5s;
}

.alert-success {
    background-color: var(--success-bg);
    color: var(--success-text);
}

.alert-danger {
    background-color: var(--danger-bg);
    color: var(--danger-text);
}

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

/* Auth Pages Specific Styles */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 2rem;
}

.auth-card {
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.auth-card h2 {
    margin-bottom: 2rem;
    color: var(--text-color);
    font-weight: 300;
}

.auth-card .form-group {
    text-align: left;
}

.auth-card .button {
    width: 100%;
    padding: 12px;
    font-size: 1rem;
    margin-top: 1rem;
}

.auth-link {
    display: inline-block;
    margin-top: 1rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.auth-link:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 991.98px) {
    .navbar {
        padding: 0 1rem;
    }
    
    .main-container {
        padding: 80px 1rem 2rem 1rem;
    }
    
    .dashboard {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .page-title {
        font-size: 1.75rem;
    }
}

@media (max-width: 767.98px) {
    .navbar {
        height: 50px;
        flex-direction: column;
        padding: 0.5rem 1rem;
    }
    
    .navbar .logo {
        font-size: 1.2rem;
    }
    
    .main-container {
        padding: 70px 1rem 2rem 1rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
    
    th, td {
        padding: 8px 10px;
        font-size: 0.9rem;
    }
    
    .form-control {
        height: 44px;
    }
    
    .auth-card {
        padding: 2rem;
    }
    
    .button {
        padding: 8px 12px;
        font-size: 0.85rem;
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mb-2 {
    margin-bottom: 1rem;
}

.mt-2 {
    margin-top: 1rem;
}

.d-flex {
    display: flex;
}

.justify-content-between {
    justify-content: space-between;
}

.align-items-center {
    align-items: center;
}

/* Upload Area Styles */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s;
    background-color: #f8f9fa;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background-color: rgba(0,136,255,0.05);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background-color: rgba(0,136,255,0.1);
}

/* Chart Container */
.chart-container {
    position: relative;
    height: 350px;
    margin: 1rem 0;
}

canvas {
    max-height: 100%;
    width: 100% !important;
    height: auto !important;
}