/* Interest Rate Calculator Custom Styles */

:root {
    --primary-color: #2563eb;
    --secondary-color: #10b981;
    --background-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --success-color: #059669;
    --danger-color: #dc2626;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.container-fluid {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header Styles */
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border-radius: 15px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.2);
}

/* Hero Section Specific Styles */
.bg-gradient {
    background: linear-gradient(135deg, #1e40af 0%, #047857 100%) !important;
    color: white !important;
}

.main-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    color: white !important;
}

.bg-gradient .main-title {
    color: white !important;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
}

.bg-gradient .lead {
    color: rgba(255, 255, 255, 0.95) !important;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
}

.lead {
    font-size: 1.2rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Navigation Styles */
.nav-pills {
    background-color: var(--card-bg);
    border-radius: 15px;
    padding: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.nav-pills .nav-link {
    border-radius: 10px;
    padding: 12px 20px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    border: none;
}

.nav-pills .nav-link:hover {
    background-color: var(--background-color);
    color: var(--primary-color);
}

.nav-pills .nav-link.active {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

/* Card Styles */
.card {
    border: none;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    background-color: var(--card-bg);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.15);
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border: none;
    padding: 20px;
    font-weight: 600;
}

.card-header h3,
.card-header h5 {
    margin: 0;
    font-weight: 600;
}

.card-body {
    padding: 25px;
}

.calculator-card {
    min-height: 500px;
}

/* Form Styles */
.form-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-control,
.form-select {
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 12px 15px;
    font-size: 16px;
    transition: all 0.3s ease;
    background-color: var(--card-bg);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.25);
    outline: none;
}

.form-range {
    height: 8px;
    border-radius: 10px;
    background: var(--border-color);
}

.form-range::-webkit-slider-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    border: none;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.form-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    border: none;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

/* Button Styles */
.btn {
    border-radius: 10px;
    padding: 12px 25px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
    background: linear-gradient(135deg, #1d4ed8 0%, #059669 100%);
}

.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;
    transform: translateY(-1px);
}

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

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

/* Results Styles */
.results {
    background: linear-gradient(135deg, var(--background-color) 0%, #e0f2fe 100%);
    border-radius: 15px;
    padding: 20px;
    border-left: 4px solid var(--secondary-color);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

.result-item:last-child {
    border-bottom: none;
}

.result-item span:first-child {
    font-weight: 500;
    color: var(--text-secondary);
}

.result-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--secondary-color);
}

/* Formula Styles */
.formula-content {
    background: var(--background-color);
    border-radius: 10px;
    padding: 20px;
    border-left: 4px solid var(--primary-color);
}

.katex-formula {
    text-align: center;
    margin: 15px 0;
    padding: 15px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.formula-content ul {
    margin: 0;
    padding-left: 20px;
}

.formula-content li {
    margin-bottom: 5px;
    color: var(--text-secondary);
}

/* History Styles */
.history-item {
    background: white;
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    border-left: 4px solid var(--primary-color);
    transition: all 0.3s ease;
}

.history-item:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
}

.history-timestamp {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.history-type {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.history-details {
    color: var(--text-secondary);
    line-height: 1.4;
}

/* Chart Container */
.chart-container {
    position: relative;
    height: 300px;
    margin: 20px 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-title {
        font-size: 2rem;
    }
    
    .lead {
        font-size: 1rem;
    }
    
    .nav-pills .nav-link {
        padding: 8px 12px;
        font-size: 0.9rem;
    }
    
    .card-body {
        padding: 20px;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .result-value {
        font-size: 1.1rem;
    }
}

@media (max-width: 576px) {
    .container-fluid {
        padding: 10px;
    }
    
    .main-title {
        font-size: 1.8rem;
    }
    
    .nav-pills .nav-link {
        padding: 6px 8px;
        font-size: 0.8rem;
    }
    
    .card-body {
        padding: 15px;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

.slide-in {
    animation: slideIn 0.3s ease-out;
}

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

/* Loading States */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

/* Calculator Links */
.calculator-link {
    transition: all 0.3s ease;
    padding: 4px 0;
    display: inline-block;
}

.calculator-link:hover {
    color: var(--secondary-color) !important;
    transform: translateX(5px);
}

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: #1d4ed8;
}

/* Print Styles */
@media print {
    body {
        background: white;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ccc;
    }
    
    .btn {
        display: none;
    }
    
    .nav-pills {
        display: none;
    }
    
    .tab-content .tab-pane {
        display: block !important;
        opacity: 1 !important;
    }
}