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

/* CSS Custom Properties - Soft Color Palette */
:root {
    /* Soft Primary Colors */
    --primary-50: #f0f9ff;
    --primary-100: #e0f2fe;
    --primary-200: #bae6fd;
    --primary-300: #7dd3fc;
    --primary-400: #38bdf8;
    --primary-500: #0ea5e9;
    --primary-600: #0284c7;
    --primary-700: #0369a1;
    --primary-800: #075985;
    --primary-900: #0c4a6e;

    /* Soft Secondary Colors */
    --secondary-50: #fdf4ff;
    --secondary-100: #fae8ff;
    --secondary-200: #f5d0fe;
    --secondary-300: #f0abfc;
    --secondary-400: #e879f9;
    --secondary-500: #d946ef;
    --secondary-600: #c026d3;
    --secondary-700: #a21caf;
    --secondary-800: #86198f;
    --secondary-900: #701a75;

    /* Soft Success Colors */
    --success-50: #f0fdf4;
    --success-100: #dcfce7;
    --success-200: #bbf7d0;
    --success-300: #86efac;
    --success-400: #4ade80;
    --success-500: #22c55e;
    --success-600: #16a34a;
    --success-700: #15803d;
    --success-800: #166534;
    --success-900: #14532d;

    /* Soft Warning Colors */
    --warning-50: #fffbeb;
    --warning-100: #fef3c7;
    --warning-200: #fde68a;
    --warning-300: #fcd34d;
    --warning-400: #fbbf24;
    --warning-500: #f59e0b;
    --warning-600: #d97706;
    --warning-700: #b45309;
    --warning-800: #92400e;
    --warning-900: #78350f;

    /* Soft Danger Colors */
    --danger-50: #fef2f2;
    --danger-100: #fee2e2;
    --danger-200: #fecaca;
    --danger-300: #fca5a5;
    --danger-400: #f87171;
    --danger-500: #ef4444;
    --danger-600: #dc2626;
    --danger-700: #b91c1c;
    --danger-800: #991b1b;
    --danger-900: #7f1d1d;

    /* Soft Neutrals */
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;

    /* Soft Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-100) 0%, var(--primary-200) 50%, var(--primary-300) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--secondary-100) 0%, var(--secondary-200) 50%, var(--secondary-300) 100%);
    --gradient-success: linear-gradient(135deg, var(--success-100) 0%, var(--success-200) 50%, var(--success-300) 100%);
    --gradient-warning: linear-gradient(135deg, var(--warning-100) 0%, var(--warning-200) 50%, var(--warning-300) 100%);
    --gradient-danger: linear-gradient(135deg, var(--danger-100) 0%, var(--danger-200) 50%, var(--danger-300) 100%);
    --gradient-background: linear-gradient(135deg, var(--gray-50) 0%, var(--primary-50) 50%, var(--secondary-50) 100%);

    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-display: 'Poppins', var(--font-sans);

    /* Soft Shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.02);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.04), 0 1px 2px 0 rgba(0, 0, 0, 0.02);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.12);

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-3xl: 2rem;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Styles */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--gray-700);
    background: var(--gradient-background);
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* Background Decoration */
.background-decoration {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: -1;
}

.floating-shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.1;
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    width: 300px;
    height: 300px;
    background: var(--gradient-primary);
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 200px;
    height: 200px;
    background: var(--gradient-secondary);
    top: 60%;
    right: 15%;
    animation-delay: 5s;
}

.shape-3 {
    width: 150px;
    height: 150px;
    background: var(--gradient-success);
    bottom: 20%;
    left: 20%;
    animation-delay: 10s;
}

.shape-4 {
    width: 100px;
    height: 100px;
    background: var(--gradient-warning);
    top: 30%;
    right: 40%;
    animation-delay: 15s;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-6);
    position: relative;
    z-index: 1;
}

/* Header */
header {
    text-align: center;
    margin-bottom: var(--space-12);
    padding: var(--space-8) 0;
}

.header-content h1 {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--space-4);
    animation: fadeInUp 0.8s ease-out;
}

.header-content p {
    font-size: 1.125rem;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto var(--space-6);
    font-weight: 400;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.add-debt-btn {
    font-size: 1.125rem;
    padding: var(--space-4) var(--space-8);
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

/* Section Header */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-8);
    padding: var(--space-6);
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-2xl);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: var(--shadow-sm);
}

.section-header h2 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--gray-800);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.section-actions {
    display: flex;
    gap: var(--space-3);
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 500;
    font-size: 0.875rem;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-400) 0%, var(--primary-500) 100%);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--success-400) 0%, var(--success-500) 100%);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
    background: linear-gradient(135deg, var(--success-500) 0%, var(--success-600) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-400) 0%, var(--danger-500) 100%);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-danger:hover {
    background: linear-gradient(135deg, var(--danger-500) 0%, var(--danger-600) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: rgba(255, 255, 255, 0.8);
    color: var(--gray-700);
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
}

.btn-outline:hover {
    background: var(--white);
    border-color: var(--primary-300);
    color: var(--primary-600);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-icon {
    padding: var(--space-2);
    border-radius: var(--radius-md);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 1rem;
    color: var(--gray-500);
}

.btn-icon:hover {
    background: var(--gray-100);
    color: var(--gray-700);
    transform: scale(1.1);
}

/* Main Content */
.main-content {
    animation: slideInUp 0.8s ease-out 0.6s both;
}

/* Debt Summary */
.debt-summary {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-3xl);
    padding: var(--space-8);
    margin-bottom: var(--space-8);
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.3);
    position: relative;
    overflow: hidden;
}

.debt-summary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-success);
    border-radius: var(--radius-3xl) var(--radius-3xl) 0 0;
}

.debt-summary h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--space-6);
    text-align: center;
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.summary-item {
    text-align: center;
    padding: var(--space-6);
    background: rgba(255, 255, 255, 0.6);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all var(--transition-normal);
}

.summary-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    background: rgba(255, 255, 255, 0.8);
}

.summary-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-500);
    margin-bottom: var(--space-2);
}

.summary-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-800);
}

.total-debt {
    color: var(--danger-500);
}

.total-paid {
    color: var(--success-500);
}

.remaining-debt {
    color: var(--warning-500);
}

.progress-percent {
    color: var(--primary-500);
}

/* Progress Bars */
.overall-progress-bar,
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
}

.overall-progress-fill,
.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--success-400) 0%, var(--success-500) 100%);
    border-radius: var(--radius-lg);
    transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.overall-progress-fill::after,
.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: shimmer 2s infinite;
}

/* Debt Cards */
.debt-card {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-3xl);
    padding: var(--space-6);
    margin-bottom: var(--space-6);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.debt-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: var(--radius-3xl) var(--radius-3xl) 0 0;
}

.debt-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-2xl);
    background: rgba(255, 255, 255, 0.9);
}

.debt-card.fully-paid::before {
    background: var(--gradient-success);
}

.debt-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-4);
}

.debt-name {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--space-1);
}

.debt-description {
    font-size: 0.875rem;
    color: var(--gray-500);
    line-height: 1.5;
}

.debt-amount {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--danger-500);
    text-align: right;
}

.debt-original {
    display: block;
    font-size: 0.875rem;
    color: var(--gray-400);
    text-decoration: line-through;
    margin-top: var(--space-1);
}

.debt-actions {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-4);
    flex-wrap: wrap;
}

/* Payment Tactics */
.payment-tactics {
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--gray-200);
}

.payment-tactics h4 {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.tactic-item {
    background: rgba(255, 255, 255, 0.6);
    border-radius: var(--radius-xl);
    padding: var(--space-4);
    margin-bottom: var(--space-3);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all var(--transition-normal);
}

.tactic-item:hover {
    background: rgba(255, 255, 255, 0.8);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.tactic-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-2);
}

.tactic-source {
    font-weight: 600;
    color: var(--gray-800);
    flex: 1;
}

.tactic-amount {
    font-weight: 700;
    color: var(--success-500);
    margin: 0 var(--space-4);
}

.tactic-actions {
    display: flex;
    gap: var(--space-2);
}

.tactic-description {
    font-size: 0.875rem;
    color: var(--gray-500);
    line-height: 1.5;
    margin-top: var(--space-2);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    animation: fadeIn 0.3s ease-out;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
}

.modal-content {
    background: var(--white);
    margin: 5% auto;
    border-radius: var(--radius-3xl);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-2xl);
    transform: scale(0.9);
    transition: transform var(--transition-normal);
    position: relative;
    z-index: 1001;
    overflow: hidden;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-6) var(--space-6) 0;
    margin-bottom: var(--space-6);
}

.modal-header h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-800);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray-400);
    transition: color var(--transition-fast);
    padding: var(--space-2);
    border-radius: var(--radius-md);
}

.modal-close:hover {
    color: var(--gray-600);
    background: var(--gray-100);
}

.modal-form {
    padding: 0 var(--space-6) var(--space-6);
}

/* Form Styles */
.form-group {
    margin-bottom: var(--space-5);
}

.form-group label {
    display: block;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--space-2);
    font-size: 0.875rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--space-4);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    transition: all var(--transition-normal);
    background: var(--white);
    font-family: var(--font-sans);
    color: var(--gray-700);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-400);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
    transform: translateY(-1px);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.modal-actions {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-6);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--space-16);
    color: var(--gray-500);
    background: rgba(255, 255, 255, 0.6);
    border-radius: var(--radius-3xl);
    border: 2px dashed var(--gray-300);
}

.empty-state h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-4);
    color: var(--gray-600);
}

/* Notifications */
.notification {
    position: fixed;
    top: var(--space-4);
    right: var(--space-4);
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-xl);
    color: var(--white);
    font-weight: 500;
    z-index: 1001;
    transform: translateX(100%);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
}

.notification.success {
    background: linear-gradient(135deg, var(--success-400) 0%, var(--success-500) 100%);
}

.notification.error {
    background: linear-gradient(135deg, var(--danger-400) 0%, var(--danger-500) 100%);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    33% { transform: translateY(-30px) rotate(120deg); }
    66% { transform: translateY(20px) rotate(240deg); }
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: var(--space-4);
    }
    
    .header-content h1 {
        font-size: 2.25rem;
    }
    
    .header-content p {
        font-size: 1rem;
    }
    
    .section-header {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
    
    .debt-header {
        flex-direction: column;
        gap: var(--space-3);
    }
    
    .debt-actions {
        flex-direction: column;
    }
    
    .tactic-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }
    
    .tactic-actions {
        align-self: flex-end;
    }
    
    .summary-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .modal-content {
        margin: 10% auto;
        width: 95%;
    }
    
    .modal-actions {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .header-content h1 {
        font-size: 1.875rem;
    }
    
    .summary-grid {
        grid-template-columns: 1fr;
    }
    
    .btn {
        padding: var(--space-3) var(--space-4);
        font-size: 0.8rem;
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .debt-card,
    .debt-summary {
        box-shadow: none;
        border: 1px solid #ccc;
    }
    
    .btn {
        display: none;
    }
    
    .background-decoration {
        display: none;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --gray-200: #000;
        --gray-500: #000;
        --gray-700: #000;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .floating-shape {
        animation: none;
    }
}