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

:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #3b82f6;
    --light-bg: #f8fafc;
    --primary-bg: #ffffff;
    --secondary-bg: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --transition-fast: all 0.15s ease;
    --transition-normal: all 0.3s ease;
    --transition-slow: all 0.5s ease;
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] {
    --primary-color: #8b9cff;
    --secondary-color: #9980d9;
    --success-color: #34d399;
    --warning-color: #fbbf24;
    --danger-color: #f87171;
    --info-color: #60a5fa;
    --light-bg: #1e293b;
    --primary-bg: #0f172a;
    --secondary-bg: #1e293b;
    --card-bg: #334155;
    --text-primary: #0080ff;
    --text-secondary: #94a3b8;
    --border-color: #475569;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5), 0 4px 6px -4px rgb(0 0 0 / 0.4);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.6), 0 8px 10px -6px rgb(0 0 0 / 0.5);
    --glass-bg: rgba(0, 0, 0, 0.2);
    --glass-border: rgba(255, 255, 255, 0.1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--primary-color) 100%);
    background-size: 400% 400%;
    animation: gradientShift 10s ease infinite;
    min-height: 100vh;
    padding: 20px;
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition-normal);
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    animation: slideInUp 0.8s ease;
}

/* Header Section */
.header-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 40px 32px;
    position: relative;
    overflow: hidden;
}

.header-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    animation: shimmer 3s infinite;
}

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

.header-section h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin: 0;
    letter-spacing: -0.02em;
}

/* Theme Toggle Button */
.theme-toggle {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-normal);
    backdrop-filter: blur(10px);
    color: white;
    font-size: 1.5rem;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(10deg);
    background: rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-lg);
}

.theme-toggle:active {
    transform: scale(0.95);
}

.theme-icon {
    transition: var(--transition-normal);
    display: block;
}

/* Theme transition effect */
html {
    transition: background-color 0.3s ease, color 0.3s ease;
}

* {
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

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

h2 {
    color: var(--text-primary);
    margin-bottom: 24px;
    font-size: 1.75rem;
    font-weight: 700;
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 12px;
    position: relative;
    letter-spacing: -0.01em;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 0;
    height: 3px;
    background: var(--secondary-color);
    transition: width 0.3s ease;
}

h2:hover::after {
    width: 100%;
}

.summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    padding: 32px;
    background: var(--light-bg);
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.summary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
}

.card {
    background: var(--card-bg);
    padding: 24px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition-normal);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
    transform: translateY(0);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.card:hover::before {
    transform: scaleX(1);
}

.card h3 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card .amount {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 8px;
    transition: var(--transition-normal);
    font-feature-settings: 'tnum';
}

.card:hover .amount {
    transform: scale(1.05);
}

.card.credit-card .amount {
    color: var(--success-color);
}

.card.expense-card .amount {
    color: var(--danger-color);
}

.card.balance-card .amount {
    color: var(--info-color);
}

.card.udhaar-given-card .amount {
    color: var(--warning-color);
}

.card.udhaar-taken-card .amount {
    color: var(--danger-color);
}

.card.udhaar-balance-card .amount {
    color: var(--info-color);
}

.amount {
    font-size: 2rem;
    font-weight: bold;
}

.credit-card .amount {
    color: #28a745;
}

.expense-card .amount {
    color: #dc3545;
}

.balance-card .amount {
    color: #667eea;
}

.section {
    padding: 32px;
    border-bottom: 1px solid var(--border-color);
    position: relative;
    animation: fadeInUp 0.6s ease;
    animation-fill-mode: both;
}

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

.section:nth-child(2) { animation-delay: 0.1s; }
.section:nth-child(3) { animation-delay: 0.2s; }
.section:nth-child(4) { animation-delay: 0.3s; }
.section:nth-child(5) { animation-delay: 0.4s; }

.section:last-child {
    border-bottom: none;
}

.form {
    margin-bottom: 32px;
    padding: 24px;
    background: var(--light-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.form:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.form-row {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    align-items: center;
}

input[type="text"],
input[type="number"],
input[type="date"],
input[type="tel"],
select {
    flex: 1;
    min-width: 160px;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    background: var(--card-bg);
    color: var(--text-primary);
    transition: var(--transition-fast);
    font-family: inherit;
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="date"]:focus,
input[type="tel"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
    transform: translateY(-1px);
}

/* Dark mode input adjustments */
[data-theme="dark"] input[type="text"],
[data-theme="dark"] input[type="number"],
[data-theme="dark"] input[type="date"],
[data-theme="dark"] input[type="tel"],
[data-theme="dark"] select {
    background: var(--secondary-bg);
    border-color: var(--border-color);
    color: var(--text-primary);
}

[data-theme="dark"] input::placeholder {
    color: var(--text-secondary);
}

input[type="text"]::placeholder,
input[type="number"]::placeholder,
input[type="tel"]::placeholder {
    color: var(--text-secondary);
    font-weight: 400;
}

button {
    padding: 14px 24px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    font-family: inherit;
    text-transform: none;
    letter-spacing: 0.01em;
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 48px;
}

button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

button:hover::before {
    left: 100%;
}

button[type="submit"],
.primary-btn {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

button[type="submit"]:hover,
.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

button[type="submit"]:active,
.primary-btn:active {
    transform: translateY(0);
}

.secondary-btn {
    background: var(--light-bg);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.secondary-btn:hover {
    background: var(--card-bg);
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.danger-btn {
    background: linear-gradient(135deg, var(--danger-color) 0%, #dc2626 100%);
    color: white;
}

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

.edit-btn {
    background: linear-gradient(135deg, var(--info-color) 0%, #1d4ed8 100%);
    color: white;
    padding: 8px 16px;
    font-size: 0.875rem;
    min-height: 36px;
}

.edit-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.delete-btn {
    background: linear-gradient(135deg, var(--danger-color) 0%, #dc2626 100%);
    color: white;
    padding: 8px 16px;
    font-size: 0.875rem;
    min-height: 36px;
}

.delete-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.save-btn {
    background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
    color: white;
}

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

.cancel-btn {
    background: var(--light-bg);
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
}

.cancel-btn:hover {
    background: var(--card-bg);
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

.table-container {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    font-size: 0.95rem;
}

thead {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

thead th {
    color: white;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.875rem;
    padding: 16px 20px;
    text-align: left;
    border-bottom: none;
}

tbody tr {
    transition: var(--transition-fast);
    border-bottom: 1px solid var(--border-color);
}

tbody tr:hover {
    background: var(--light-bg);
    transform: scale(1.01);
}

tbody tr:last-child {
    border-bottom: none;
}

td {
    padding: 16px 20px;
    color: var(--text-primary);
    font-weight: 500;
    vertical-align: middle;
}

.credit-amount {
    color: var(--success-color);
    font-weight: 700;
    font-feature-settings: 'tnum';
}

.expense-amount {
    color: var(--danger-color);
    font-weight: 700;
    font-feature-settings: 'tnum';
}

.neutral {
    color: var(--text-secondary);
    font-weight: 600;
}

.no-data {
    text-align: center;
    padding: 48px 20px;
    color: var(--text-secondary);
    font-style: italic;
    font-size: 1.1rem;
    background: var(--light-bg);
}

thead {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #e9ecef;
}

th {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 1px;
}

tbody tr {
    transition: background-color 0.2s ease;
}

tbody tr:hover {
    background-color: #f8f9fa;
}

tbody tr:nth-child(even) {
    background-color: #f8f9fa;
}

tbody tr:nth-child(even):hover {
    background-color: #e9ecef;
}

.delete-btn {
    background: #dc3545;
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.delete-btn:hover {
    background: #c82333;
    transform: scale(1.05);
}

.no-data {
    text-align: center;
    padding: 40px;
    color: #666;
    font-style: italic;
}

.credit-amount {
    color: #28a745;
    font-weight: bold;
}

.expense-amount {
    color: #dc3545;
    font-weight: bold;
}

/* Udhaar Specific Styles */
.udhaar-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 12px;
}

.udhaar-given-card .amount {
    color: #fd7e14; /* Orange for money lent */
}

.udhaar-taken-card .amount {
    color: #6f42c1; /* Purple for money borrowed */
}

.udhaar-balance-card .amount {
    color: #20c997; /* Teal for net balance */
}

.udhaar-tables {
    display: grid;
    gap: 30px;
}

.table-section h3 {
    color: #495057;
    margin-bottom: 15px;
    font-size: 1.3rem;
    border-bottom: 2px solid #e9ecef;
    padding-bottom: 8px;
}

.udhaar-given-amount {
    color: #fd7e14;
    font-weight: bold;
}

.udhaar-taken-amount {
    color: #6f42c1;
    font-weight: bold;
}

.status-pending {
    background: #ffc107;
    color: #212529;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
}

.status-paid {
    background: #28a745;
    color: white;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
}

.mark-paid-btn {
    background: #28a745;
    color: white;
    border: none;
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    margin-right: 5px;
    transition: all 0.2s ease;
}

.mark-paid-btn:hover {
    background: #218838;
    transform: scale(1.05);
}

.mark-pending-btn {
    background: #ffc107;
    color: #212529;
    border: none;
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    margin-right: 5px;
    transition: all 0.2s ease;
}

.mark-pending-btn:hover {
    background: #e0a800;
    transform: scale(1.05);
}

select {
    flex: 1;
    min-width: 150px;
    padding: 12px 15px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    background: white;
}

select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Person-wise Summary Styles */
.person-summary-section {
    margin-bottom: 30px;
}

.person-summary-section h3 {
    color: #495057;
    margin-bottom: 20px;
    font-size: 1.3rem;
    border-bottom: 2px solid #e9ecef;
    padding-bottom: 8px;
}

.person-summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.person-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
    border-left: 4px solid #667eea;
    transition: transform 0.2s ease;
}

.person-card:hover {
    transform: translateY(-2px);
}

.person-card.owes-you {
    border-left-color: #28a745; /* Green for people who owe you */
}

.person-card.you-owe {
    border-left-color: #dc3545; /* Red for people you owe */
}

.person-card.settled {
    border-left-color: #6c757d; /* Gray for settled accounts */
}

.person-name {
    font-size: 1.2rem;
    font-weight: bold;
    color: #333;
    margin-bottom: 10px;
}

.person-balance {
    font-size: 1.1rem;
    font-weight: bold;
    margin-bottom: 5px;
}

.person-balance.positive {
    color: #28a745; /* Green for money owed to you */
}

.person-balance.negative {
    color: #dc3545; /* Red for money you owe */
}

.person-balance.zero {
    color: #6c757d; /* Gray for settled */
}

.person-details {
    font-size: 0.9rem;
    color: #666;
    margin-top: 10px;
}

.person-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 10px;
}

.stat-item {
    background: #f8f9fa;
    padding: 8px;
    border-radius: 6px;
    text-align: center;
}

.stat-label {
    font-size: 0.8rem;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-weight: bold;
    color: #333;
}

/* Filter Section Styles */
.filter-section {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    flex-wrap: wrap;
    align-items: center;
}

.filter-section select {
    min-width: 150px;
    max-width: 200px;
}

.filter-section input[type="date"] {
    min-width: 160px;
}

/* Transaction Type Styles */
.type-given {
    background: #fd7e14;
    color: white;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
}

.type-taken {
    background: #6f42c1;
    color: white;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
}

.type-received_back {
    background: #28a745;
    color: white;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
}

.type-paid_back {
    background: #dc3545;
    color: white;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
}

.running-balance {
    font-weight: bold;
}

.running-balance.positive {
    color: #28a745;
}

.running-balance.negative {
    color: #dc3545;
}

.running-balance.zero {
    color: #6c757d;
}

.udhaar-received-amount {
    color: #28a745;
    font-weight: bold;
}

.udhaar-paid-amount {
    color: #dc3545;
    font-weight: bold;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    animation: modalBackdropFadeIn 0.3s ease;
}

@keyframes modalBackdropFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--card-bg);
    margin: 3% auto;
    padding: 0;
    border-radius: var(--radius-xl);
    width: 95%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: modalSlideIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-40px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 24px 32px;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.modal-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    animation: shimmer 2s infinite;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.close {
    color: white;
    font-size: 2rem;
    font-weight: 300;
    cursor: pointer;
    transition: var(--transition-fast);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
}

.close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

.modal-body {
    padding: 32px;
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

/* Notification System */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    padding: 16px 24px;
    border-radius: var(--radius-lg);
    color: white;
    font-weight: 600;
    font-size: 0.95rem;
    box-shadow: var(--shadow-xl);
    transform: translateX(400px);
    opacity: 0;
    transition: var(--transition-normal);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    min-width: 300px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.notification.show {
    transform: translateX(0);
    opacity: 1;
}

.notification.success {
    background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
}

.notification.error {
    background: linear-gradient(135deg, var(--danger-color) 0%, #dc2626 100%);
}

.notification.info {
    background: linear-gradient(135deg, var(--info-color) 0%, #1d4ed8 100%);
}

.notification::before {
    content: '✓';
    font-size: 1.2rem;
    font-weight: bold;
}

.notification.error::before {
    content: '✗';
}

.notification.info::before {
    content: 'ℹ';
}

.modal-body .form-row {
    display: flex;
    flex-direction: column;
    margin-bottom: 20px;
}

.modal-body label {
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.modal-body input,
.modal-body select {
    padding: 12px 15px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    width: 100%;
    box-sizing: border-box;
}

.modal-body input:focus,
.modal-body select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.modal-actions {
    display: flex;
    gap: 15px;
    justify-content: flex-end;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #e9ecef;
}

.save-btn {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.save-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(40, 167, 69, 0.4);
}

.cancel-btn {
    background: #6c757d;
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.cancel-btn:hover {
    background: #5a6268;
    transform: translateY(-2px);
}

.edit-btn {
    background: #ffc107;
    color: #212529;
    border: none;
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    margin-right: 5px;
    transition: all 0.2s ease;
}

.edit-btn:hover {
    background: #e0a800;
    transform: scale(1.05);
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .header-section {
        padding: 20px 16px;
        flex-direction: row;
        gap: 16px;
    }
    
    .header-section h1 {
        font-size: 1.8rem;
    }
    
    .theme-toggle {
        width: 45px;
        height: 45px;
        font-size: 1.3rem;
    }
    
    .summary {
        grid-template-columns: 1fr;
        padding: 20px;
    }
    
    .section {
        padding: 20px;
    }
    
    .form-row {
        flex-direction: column;
    }
    
    input[type="text"],
    input[type="number"],
    input[type="date"] {
        min-width: 100%;
    }
    
    table {
        font-size: 0.9rem;
    }
    
    th, td {
        padding: 10px;
    }
}

/* Enhanced Khatabook Style Contact Management */
.add-contact-section {
    background: linear-gradient(135deg, var(--light-bg) 0%, rgba(102, 126, 234, 0.05) 100%);
    padding: 24px;
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    border: 2px dashed var(--primary-color);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.add-contact-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.1), transparent);
    transition: left 0.8s;
}

.add-contact-section:hover::before {
    left: 100%;
}

.add-contact-section:hover {
    border-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.add-contact-section h3 {
    color: var(--primary-color);
    margin-bottom: 16px;
    font-size: 1.2rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
}

.contacts-section {
    margin-bottom: 24px;
}

.contacts-section h3 {
    color: var(--text-primary);
    margin-bottom: 20px;
    font-size: 1.2rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
}

.contacts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

.contact-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    cursor: pointer;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.contact-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.contact-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.contact-card:hover::before {
    transform: scaleX(1);
}

.contact-header {
    display: flex;
    align-items: center;
    margin-bottom: 16px;
}

.contact-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 16px;
    font-weight: 700;
    color: white;
    font-size: 1.3rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.contact-card:hover .contact-avatar {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.contact-name {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
    letter-spacing: -0.01em;
}

.contact-phone {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.contact-balance {
    text-align: center;
    padding: 12px;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 0.95rem;
    transition: var(--transition-normal);
}

.contact-balance.owes-you {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(5, 150, 105, 0.1) 100%);
    color: var(--success-color);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.contact-balance.you-owe {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1) 0%, rgba(220, 38, 38, 0.1) 100%);
    color: var(--danger-color);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.contact-balance.settled {
    background: linear-gradient(135deg, rgba(100, 116, 139, 0.1) 0%, rgba(71, 85, 105, 0.1) 100%);
    color: var(--text-secondary);
    border: 1px solid rgba(100, 116, 139, 0.2);
}

/* Contact Modal Styles */
.contact-modal {
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
}

.contact-info {
    display: flex;
    align-items: center;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
    margin-bottom: 20px;
}

.contact-info .contact-avatar {
    width: 60px;
    height: 60px;
    font-size: 1.5rem;
    margin-right: 20px;
}

.contact-details h4 {
    font-size: 1.3rem;
    color: #333;
    margin-bottom: 5px;
}

.contact-details p {
    color: #666;
    margin-bottom: 10px;
}

.contact-balance .balance-amount {
    font-size: 1.2rem;
    font-weight: bold;
}

.contact-actions {
    margin-left: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.quick-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
}

.quick-actions button {
    padding: 15px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.lent-btn {
    background: #d4edda;
    color: #155724;
}

.lent-btn:hover {
    background: #c3e6cb;
}

.borrowed-btn {
    background: #f8d7da;
    color: #721c24;
}

.borrowed-btn:hover {
    background: #f1b0b7;
}

.received-btn {
    background: #d1ecf1;
    color: #0c5460;
}

.received-btn:hover {
    background: #bee5eb;
}

.paid-btn {
    background: #fff3cd;
    color: #856404;
}

.paid-btn:hover {
    background: #ffeaa7;
}

.transaction-form {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    border: 1px solid #e9ecef;
}

.transaction-form h4 {
    color: #333;
    margin-bottom: 15px;
}

.form-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.contact-history {
    margin-top: 20px;
}

.contact-history h4 {
    color: #333;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid #e9ecef;
}

.transaction-history-list {
    max-height: 300px;
    overflow-y: auto;
}

.transaction-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    margin-bottom: 10px;
    background: white;
}

.transaction-left {
    flex: 1;
}

.transaction-type {
    font-weight: 600;
    margin-bottom: 2px;
}

.transaction-type.given {
    color: #28a745;
}

.transaction-type.taken {
    color: #dc3545;
}

.transaction-type.received_back {
    color: #17a2b8;
}

.transaction-type.paid_back {
    color: #ffc107;
    color: #856404;
}

.transaction-purpose {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 2px;
}

.transaction-date {
    font-size: 0.8rem;
    color: #999;
}

.transaction-right {
    text-align: right;
}

.transaction-amount {
    font-weight: 600;
    font-size: 1.1rem;
}

.transaction-actions {
    margin-top: 5px;
}

.transaction-actions button {
    font-size: 0.8rem;
    padding: 2px 8px;
    margin-left: 5px;
}

.no-contacts {
    text-align: center;
    padding: 40px;
    color: #666;
    font-style: italic;
}

/* Responsive Design for Contact Cards */
@media (max-width: 768px) {
    .contacts-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        flex-direction: column;
        text-align: center;
    }
    
    .contact-info .contact-avatar {
        margin-right: 0;
        margin-bottom: 15px;
    }
    
    .contact-actions {
        margin-left: 0;
        margin-top: 15px;
        flex-direction: row;
        justify-content: center;
    }
    
    .quick-actions {
        grid-template-columns: 1fr;
    }
    
    .contact-card {
        margin-bottom: 15px;
    }
    
    .btn-primary, .btn-success, .btn-danger, .btn-secondary {
        padding: 12px 16px;
        font-size: 14px;
    }
    
    .modal .btn {
        width: 100%;
        margin-bottom: 10px;
    }
    
    .modal .btn:last-child {
        margin-bottom: 0;
    }
}

/* Touch optimizations */
@media (hover: none) {
    .contact-card:hover {
        transform: none;
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    }
    
    .btn:hover {
        transform: none;
    }
    
    .btn:active {
        transform: scale(0.98);
    }
    
    .contact-card:active {
        transform: scale(0.98);
    }
}

/* Modal dark mode adjustments */
[data-theme="dark"] .modal {
    background: rgba(0, 0, 0, 0.8);
}

[data-theme="dark"] .modal-content {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
}

[data-theme="dark"] .contact-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
}

[data-theme="dark"] .notification {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

[data-theme="dark"] .form {
    background: var(--secondary-bg);
}

[data-theme="dark"] .transaction-form {
    background: var(--secondary-bg);
}

[data-theme="dark"] .add-contact-section {
    background: var(--secondary-bg);
}

[data-theme="dark"] .contact-info {
    background: var(--secondary-bg);
}

[data-theme="dark"] .transaction-item {
    background: var(--card-bg);
    border-color: var(--border-color);
}

[data-theme="dark"] .person-card {
    background: var(--card-bg);
}

[data-theme="dark"] .stat-item {
    background: var(--secondary-bg);
}

/* Touch optimizations */

/* Animation optimization */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print styles */
@media print {
    .modal, .btn, .quick-actions {
        display: none !important;
    }
    
    .contact-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #000;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
}