/* Modern Survey Analysis System Styles */

:root {
    --primary-color: #002145;
    --primary-dark: #001a3a;
    --secondary-color: #003d82;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --light-bg: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

* {
    box-sizing: border-box;
}

body {
    background: #ffffff;
    min-height: 100vh;
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text-primary);
    margin: 0;
    padding: 0;
}

/* Navbar */
.navbar {
    background: rgba(255, 255, 255, 0.95) !important;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary-color);
}

/* Main container */
main {
    padding: 2rem 0;
    min-height: calc(100vh - 200px);
}

/* Cards */
.card {
    border: none;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    overflow: hidden;
}

.card:hover {
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.card-header {
    background: var(--primary-color);
    border: none;
    border-radius: 20px 20px 0 0 !important;
    padding: 1.5rem;
    color: white;
}

.card-body {
    padding: 2rem;
}

/* Buttons */
.btn {
    border-radius: 12px;
    font-weight: 600;
    padding: 12px 24px;
    border: none;
    position: relative;
    overflow: hidden;
}

/* Button hover effects removed */

.btn-primary {
    background: var(--primary-color);
    box-shadow: 0 4px 15px rgba(0, 33, 69, 0.4);
}

.btn-primary:hover {
    box-shadow: 0 8px 25px rgba(0, 33, 69, 0.6);
    background: var(--primary-dark);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color), #059669);
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.4);
}

.btn-success:hover {
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.6);
}

.btn-lg {
    padding: 16px 32px;
    font-size: 1.1rem;
    border-radius: 16px;
}

/* File upload area */
.upload-area {
    border: 3px dashed var(--border-color);
    border-radius: 16px;
    padding: 3rem 2rem;
    text-align: center;
    background: var(--light-bg);
    cursor: pointer;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(102, 126, 234, 0.05);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(102, 126, 234, 0.1);
}

.form-control {
    border-radius: 12px;
    border: 2px solid var(--border-color);
    padding: 12px 16px;
    transition: all 0.3s ease;
    background: var(--card-bg);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    background: var(--card-bg);
}

/* Alerts */
.alert {
    border-radius: 12px;
    border: none;
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow);
}

.alert-success {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(5, 150, 105, 0.1));
    color: var(--success-color);
    border-left: 4px solid var(--success-color);
}

.alert-warning {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(217, 119, 6, 0.1));
    color: var(--warning-color);
    border-left: 4px solid var(--warning-color);
}

.alert-info {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(37, 99, 235, 0.1));
    color: #3b82f6;
    border-left: 4px solid #3b82f6;
}

/* List groups */
.list-group-item {
    border-radius: 12px !important;
    margin-bottom: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    background: var(--card-bg);
}

.list-group-item:hover {
    background: var(--light-bg);
    transform: translateX(5px);
    box-shadow: var(--shadow);
}

/* Badges */
.badge {
    border-radius: 8px;
    font-size: 0.75rem;
    padding: 6px 12px;
    font-weight: 600;
}

/* Loading animations */
.loading {
    position: relative;
}

.spinner-border {
    width: 1.5rem;
    height: 1.5rem;
    border-width: 3px;
}

/* Results page */
.results-card {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(5, 150, 105, 0.1));
    border: 2px solid rgba(16, 185, 129, 0.2);
}

.download-item {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
}

.download-item:hover {
    box-shadow: var(--shadow-lg);
}

/* Footer */
footer {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    margin-top: auto;
}

/* Animations */
/* Animations removed for simplicity */

/* Feature icons */
.feature-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    background: var(--primary-color);
    color: white;
    font-size: 1.5rem;
    box-shadow: var(--shadow);
}

/* Progress bar */
.progress {
    height: 8px;
    border-radius: 4px;
    background: var(--border-color);
    overflow: hidden;
}

.progress-bar {
    background: var(--primary-color);
    border-radius: 4px;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .card-body {
        padding: 1.5rem;
    }
    
    .btn-lg {
        padding: 14px 28px;
        font-size: 1rem;
    }
    
    .upload-area {
        padding: 2rem 1rem;
    }
    
    main {
        padding: 1rem 0;
    }
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}