/* Professional Google-style Design */
:root {
    --primary-color: #1a73e8;
    --secondary-color: #34a853;
    --danger-color: #ea4335;
    --warning-color: #fbbc04;
    --dark-color: #202124;
    --light-gray: #f8f9fa;
    --border-color: #dadce0;
    --text-color: #3c4043;
    --shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --shadow-hover: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Google Sans', 'Roboto', Arial, sans-serif;
    background: var(--light-gray);
    color: var(--text-color);
    line-height: 1.6;
}

/* Header */
.header {
    background: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    padding: 1rem 0;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--primary-color) !important;
    text-decoration: none;
}

.navbar-brand:hover {
    color: var(--secondary-color) !important;
}

.nav-link {
    color: var(--text-color) !important;
    font-weight: 400;
    padding: 0.5rem 1rem !important;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-link:hover {
    background: var(--light-gray);
    color: var(--primary-color) !important;
}

/* Cards */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    background: white;
}

.card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.card-header {
    background: white;
    border-bottom: 1px solid var(--border-color);
    border-radius: 12px 12px 0 0 !important;
    padding: 1.5rem;
}

.card-body {
    padding: 1.5rem;
}

/* Buttons */
.btn {
    border-radius: 8px;
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border: none;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: #1557b0;
    transform: translateY(-1px);
    box-shadow: var(--shadow-hover);
}

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

.btn-success:hover {
    background: #2d8f47;
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background: #d33b2c;
}

.btn-warning {
    background: var(--warning-color);
    color: var(--dark-color);
}

.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--primary-color);
    color: white;
}

/* Forms */
.form-control, .form-select {
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1);
    outline: none;
}

.form-label {
    font-weight: 500;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

/* Tables */
.table {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.table thead th {
    background: var(--light-gray);
    border: none;
    font-weight: 500;
    color: var(--text-color);
    padding: 1rem;
}

.table tbody td {
    padding: 1rem;
    border-color: var(--border-color);
    vertical-align: middle;
}

.table tbody tr:hover {
    background: rgba(26, 115, 232, 0.05);
}

/* Badges */
.badge {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 500;
    font-size: 0.875rem;
}

.bg-primary { background: var(--primary-color) !important; }
.bg-success { background: var(--secondary-color) !important; }
.bg-danger { background: var(--danger-color) !important; }
.bg-warning { background: var(--warning-color) !important; color: var(--dark-color) !important; }

/* Stats Cards */
.stats-card {
    background: linear-gradient(135deg, var(--primary-color), #4285f4);
    color: white;
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.stats-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.stats-card h3 {
    font-size: 2.5rem;
    font-weight: 300;
    margin: 0.5rem 0;
}

.stats-card.success {
    background: linear-gradient(135deg, var(--secondary-color), #4caf50);
}

.stats-card.danger {
    background: linear-gradient(135deg, var(--danger-color), #f44336);
}

.stats-card.warning {
    background: linear-gradient(135deg, var(--warning-color), #ff9800);
    color: var(--dark-color);
}

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

.progress-bar {
    border-radius: 4px;
    transition: width 0.6s ease;
}

/* Alerts */
.alert {
    border: none;
    border-radius: 12px;
    padding: 1rem 1.5rem;
    margin: 1rem 0;
}

.alert-success {
    background: rgba(52, 168, 83, 0.1);
    color: var(--secondary-color);
    border-left: 4px solid var(--secondary-color);
}

.alert-danger {
    background: rgba(234, 67, 53, 0.1);
    color: var(--danger-color);
    border-left: 4px solid var(--danger-color);
}

.alert-info {
    background: rgba(26, 115, 232, 0.1);
    color: var(--primary-color);
    border-left: 4px solid var(--primary-color);
}

/* Contract Status */
.status-indicator {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 500;
    font-size: 0.875rem;
}

.status-created { background: rgba(158, 158, 158, 0.1); color: #9e9e9e; }
.status-sent { background: rgba(251, 188, 4, 0.1); color: var(--warning-color); }
.status-signed { background: rgba(52, 168, 83, 0.1); color: var(--secondary-color); }
.status-completed { background: rgba(26, 115, 232, 0.1); color: var(--primary-color); }

/* Footer */
.footer {
    background: white;
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
    text-align: center;
    color: var(--text-color);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .stats-card {
        padding: 1.5rem;
        margin-bottom: 1rem;
    }
    
    .stats-card h3 {
        font-size: 2rem;
    }
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(26, 115, 232, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

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

/* Professional Shadows */
.shadow-sm { box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24); }
.shadow { box-shadow: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23); }
.shadow-lg { box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23); }