@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    /* Light Theme Color Palette */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #8b5cf6;
    --success: #10b981;
    --success-light: #d1fae5;
    --danger: #ef4444;
    --danger-light: #fee2e2;
    --warning: #f59e0b;
    --info: #3b82f6;

    /* Background Colors */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-hover: #f8fafc;

    /* Text Colors */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;

    /* Border & Shadow */
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Category Colors */
    --cat-food: #f59e0b;
    --cat-transport: #3b82f6;
    --cat-entertainment: #8b5cf6;
    --cat-shopping: #ec4899;
    --cat-health: #10b981;
    --cat-bills: #ef4444;
    --cat-salary: #059669;
    --cat-freelance: #6366f1;
    --cat-investment: #8b5cf6;
    --cat-other: #64748b;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* Header */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-lg) 0;
    margin: calc(var(--spacing-lg) * -1) calc(var(--spacing-lg) * -1) var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.header-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    box-shadow: var(--shadow-md);
}

.header-text h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.header-text p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Dashboard Grid */
.dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

/* Stat Card */
.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    transition: width var(--transition-normal);
}

.stat-card.income::before {
    background: var(--success);
}

.stat-card.expense::before {
    background: var(--danger);
}

.stat-card.balance::before {
    background: var(--primary);
}

.stat-card.transactions::before {
    background: var(--info);
}

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

.stat-card:hover::before {
    width: 100%;
    opacity: 0.05;
}

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

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: white;
}

.stat-card.income .stat-icon {
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
}

.stat-card.expense .stat-icon {
    background: linear-gradient(135deg, var(--danger) 0%, #dc2626 100%);
}

.stat-card.balance .stat-icon {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.stat-card.transactions .stat-icon {
    background: linear-gradient(135deg, var(--info) 0%, #2563eb 100%);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.stat-card.income .stat-value {
    color: var(--success);
}

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

.stat-subtext {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Main Content Grid */
.main-content {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: var(--spacing-lg);
}

/* Form Section */
.form-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    height: fit-content;
    position: sticky;
    top: var(--spacing-lg);
}

.section-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-light);
}

.section-header i {
    font-size: 1.5rem;
    color: var(--primary);
}

.section-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Transaction Type Toggle */
.transaction-type {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    background: var(--bg-tertiary);
    padding: 4px;
    border-radius: var(--radius-md);
}

.type-btn {
    padding: 0.75rem;
    border: none;
    background: transparent;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: var(--text-secondary);
}

.type-btn:hover {
    background: var(--bg-hover);
}

.type-btn.active {
    background: var(--bg-secondary);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.type-btn.income.active {
    color: var(--success);
}

.type-btn.expense.active {
    color: var(--danger);
}

/* Form Groups */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: all var(--transition-normal);
    outline: none;
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--primary);
    background: var(--bg-secondary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

/* Category Grid */
.category-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.category-btn {
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    position: relative;
}

.category-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.category-btn.active {
    background: var(--bg-secondary);
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.category-btn i {
    font-size: 1.5rem;
    transition: transform var(--transition-normal);
}

.category-btn:hover i {
    transform: scale(1.1);
}

.category-btn .label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: capitalize;
}

.category-btn.active .label {
    color: var(--text-primary);
}

/* Category Colors */
.category-btn[data-category="food"] i {
    color: var(--cat-food);
}

.category-btn[data-category="transport"] i {
    color: var(--cat-transport);
}

.category-btn[data-category="entertainment"] i {
    color: var(--cat-entertainment);
}

.category-btn[data-category="shopping"] i {
    color: var(--cat-shopping);
}

.category-btn[data-category="health"] i {
    color: var(--cat-health);
}

.category-btn[data-category="bills"] i {
    color: var(--cat-bills);
}

.category-btn[data-category="salary"] i {
    color: var(--cat-salary);
}

.category-btn[data-category="freelance"] i {
    color: var(--cat-freelance);
}

.category-btn[data-category="investment"] i {
    color: var(--cat-investment);
}

.category-btn[data-category="other"] i {
    color: var(--cat-other);
}

/* Button */
.btn {
    width: 100%;
    padding: 0.875rem 1.5rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

.btn:active {
    transform: translateY(0);
}

/* Transactions Section */
.transactions-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

/* Filter Tabs */
.filter-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--border-light);
    padding-bottom: 0;
}

.filter-tab {
    padding: 0.75rem 1.25rem;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    margin-bottom: -2px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-tab:hover {
    color: var(--text-primary);
}

.filter-tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.filter-tab .badge {
    background: var(--bg-tertiary);
    color: var(--text-muted);
    padding: 0.125rem 0.5rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
}

.filter-tab.active .badge {
    background: var(--primary);
    color: white;
}

/* Transactions List */
.transactions-list {
    max-height: 600px;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.transactions-list::-webkit-scrollbar {
    width: 6px;
}

.transactions-list::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
}

.transactions-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-full);
}

.transactions-list::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Transaction Item */
.transaction-item {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-normal);
    position: relative;
}

.transaction-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 4px;
    height: 100%;
    border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.transaction-item.income::before {
    background: var(--success);
}

.transaction-item.expense::before {
    background: var(--danger);
}

.transaction-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
    background: var(--bg-secondary);
}

.transaction-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: white;
    flex-shrink: 0;
}

.transaction-item[data-category="food"] .transaction-icon {
    background: var(--cat-food);
}

.transaction-item[data-category="transport"] .transaction-icon {
    background: var(--cat-transport);
}

.transaction-item[data-category="entertainment"] .transaction-icon {
    background: var(--cat-entertainment);
}

.transaction-item[data-category="shopping"] .transaction-icon {
    background: var(--cat-shopping);
}

.transaction-item[data-category="health"] .transaction-icon {
    background: var(--cat-health);
}

.transaction-item[data-category="bills"] .transaction-icon {
    background: var(--cat-bills);
}

.transaction-item[data-category="salary"] .transaction-icon {
    background: var(--cat-salary);
}

.transaction-item[data-category="freelance"] .transaction-icon {
    background: var(--cat-freelance);
}

.transaction-item[data-category="investment"] .transaction-icon {
    background: var(--cat-investment);
}

.transaction-item[data-category="other"] .transaction-icon {
    background: var(--cat-other);
}

.transaction-details {
    flex: 1;
    min-width: 0;
}

.transaction-description {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.transaction-meta {
    display: flex;
    gap: var(--spacing-sm);
    font-size: 0.8rem;
    color: var(--text-muted);
    align-items: center;
}

.transaction-category {
    text-transform: capitalize;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.transaction-amount {
    font-size: 1.125rem;
    font-weight: 700;
    margin-right: var(--spacing-sm);
    white-space: nowrap;
}

.transaction-item.income .transaction-amount {
    color: var(--success);
}

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

.transaction-delete {
    background: transparent;
    border: none;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    flex-shrink: 0;
}

.transaction-delete:hover {
    background: var(--danger-light);
    color: var(--danger);
    transform: scale(1.1);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    color: var(--text-muted);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.3;
    color: var(--text-muted);
}

.empty-state p {
    font-size: 1rem;
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .form-section {
        position: static;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

    .dashboard {
        grid-template-columns: 1fr;
    }

    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .filter-tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}

@media (max-width: 480px) {
    .container {
        padding: var(--spacing-sm);
    }

    .header-text h1 {
        font-size: 1.5rem;
    }

    .stat-value {
        font-size: 1.5rem;
    }
}