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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #10b981;
    --danger-color: #dc2626;
    --warning-color: #f59e0b;
    --success-color: #059669;
    --dark-bg: #0f172a;
    --light-bg: #f8fafc;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --shadow: 0 2px 8px rgba(15, 23, 42, 0.08);
    --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.12);
    --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.15);
}

/* Animations */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

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

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

@keyframes progressFill {
    from {
        width: 0;
    }
    to {
        width: var(--fill-width);
    }
}

@keyframes scaleIn {
    from {
        transform: scale(0.95);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.app-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 2.5rem 2rem;
    box-shadow: var(--shadow-lg);
    animation: slideInDown 0.6s ease;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 400px;
    height: 400px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transform: translate(100px, -100px);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.header-date {
    opacity: 0.95;
    font-size: 0.95rem;
    font-weight: 500;
}

/* Main Container */
.main-container {
    display: grid;
    grid-template-columns: 320px 1fr;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    gap: 2rem;
    padding: 2.5rem 2rem;
}

/* Sidebar */
.sidebar {
    position: sticky;
    top: 2rem;
    height: fit-content;
}

.sidebar-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Summary Cards */
.summary-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.period-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.5rem;
    background: var(--card-bg);
    padding: 0.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.period-btn {
    padding: 0.65rem;
    border: 2px solid transparent;
    background: transparent;
    border-radius: 7px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.period-btn:hover {
    background: var(--light-bg);
    color: var(--primary-color);
}

.period-btn.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border-color: var(--primary-color);
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.summary-card {
    background: var(--card-bg);
    padding: 1.75rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    animation: scaleIn 0.4s ease;
    position: relative;
    overflow: hidden;
}

.summary-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    opacity: 0.05;
    transform: translate(30px, -30px);
}

.summary-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.animate-in {
    animation: slideInUp 0.6s ease 0.2s backwards;
}

.summary-label {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    margin-bottom: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.summary-amount {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary-color);
    transition: all 0.3s ease;
    letter-spacing: -1px;
}

.amount-change {
    font-size: 0.75rem;
    color: var(--secondary-color);
    margin-top: 0.5rem;
    font-weight: 600;
}

.stat-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.stat-mini {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--card-bg);
    padding: 1.25rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    animation: scaleIn 0.4s ease 0.1s backwards;
    transition: all 0.3s ease;
}

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

.stat-icon {
    font-size: 1.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--light-bg);
    border-radius: 8px;
}

.stat-info {
    flex: 1;
}

.stat-label {
    font-size: 0.7rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Category Breakdown */
.category-breakdown {
    background: var(--card-bg);
    padding: 1.75rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    animation: slideInUp 0.6s ease 0.3s backwards;
}

.category-breakdown h3 {
    font-size: 1.1rem;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
    font-weight: 700;
}

.category-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1rem;
}

.category-item {
    animation: slideInFromLeft 0.4s ease;
}

.category-item-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.625rem;
}

.category-item-name {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.category-item-amount {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 0.95rem;
}

.category-progress {
    width: 100%;
    height: 6px;
    background: var(--light-bg);
    border-radius: 3px;
    overflow: hidden;
}

.category-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: 3px;
    animation: progressFill 0.8s ease forwards;
    transition: all 0.3s ease;
}

.category-item:hover .category-progress-bar {
    filter: brightness(1.15);
}

.chart-container {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 2px solid var(--light-bg);
}

/* Content Area */
.content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Form Section */
.form-section {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 14px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    animation: slideInUp 0.6s ease 0.1s backwards;
}

.form-section h2 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
    font-weight: 700;
}

.expense-form {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.form-group input,
.form-group select {
    padding: 0.95rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: white;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
    transform: scale(1.01);
}

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

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-danger {
    padding: 0.95rem 1.75rem;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.3px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    width: 100%;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.35);
}

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

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

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

.btn-danger:hover {
    background: var(--danger-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.25);
}

/* Controls Section */
.controls-section {
    display: flex;
    gap: 1rem;
    align-items: center;
    padding: 1.75rem;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    animation: slideInUp 0.6s ease;
}

.search-box {
    flex: 1;
}

.search-box input {
    width: 100%;
    padding: 0.95rem 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: var(--light-bg);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: white;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.filter-controls {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.filter-select {
    padding: 0.95rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.9rem;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

/* Expenses Section */
.expenses-section {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 14px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    animation: slideInUp 0.6s ease 0.1s backwards;
}

.expenses-section h2 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
    font-weight: 700;
}

.expense-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-tertiary);
    font-size: 1.05rem;
    animation: fadeIn 0.4s ease;
    background: var(--light-bg);
    border-radius: 10px;
    border: 2px dashed var(--border-color);
}

.expense-item {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 1.5rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--light-bg) 0%, white 100%);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    align-items: center;
    animation: slideInUp 0.4s ease;
    position: relative;
    overflow: hidden;
}

.expense-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 4px;
    background: linear-gradient(180deg, var(--primary-color), var(--primary-light));
}

.expense-item:hover {
    transform: translateX(6px) translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
    background: white;
}

.expense-item.fade-out {
    animation: slideOutDown 0.3s ease;
}

.expense-item-content {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    flex: 1;
}

.expense-category-icon {
    font-size: 1.75rem;
    animation: scaleIn 0.3s ease;
}

.expense-header {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    font-weight: 700;
    color: var(--text-primary);
    font-size: 1rem;
}

.expense-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: block;
}

.expense-date {
    color: var(--text-tertiary);
    font-size: 0.8rem;
    font-weight: 500;
}

.expense-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.expense-amount {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--danger-color);
    min-width: 100px;
    text-align: right;
    animation: scaleIn 0.5s ease;
    letter-spacing: -0.5px;
}

.btn-delete {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: var(--light-bg);
    opacity: 0.7;
}

.btn-delete:hover {
    transform: scale(1.2) rotate(10deg);
    opacity: 1;
    background: rgba(220, 38, 38, 0.1);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .main-container {
        grid-template-columns: 1fr;
        gap: 2rem;
        padding: 2rem;
    }

    .sidebar {
        position: static;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .header h1 {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    body {
        padding: 0;
    }

    .header {
        padding: 1.75rem 1rem;
    }

    .header h1 {
        font-size: 1.75rem;
    }

    .main-container {
        gap: 1.5rem;
        padding: 1.5rem 1rem;
    }

    .sidebar-content {
        flex-direction: row;
        gap: 1.25rem;
    }

    .summary-section,
    .category-breakdown {
        flex: 1;
    }

    .form-section,
    .expenses-section,
    .controls-section {
        padding: 1.75rem;
    }

    .controls-section {
        flex-direction: column;
        gap: 1rem;
    }

    .filter-controls {
        width: 100%;
    }

    .filter-select,
    .btn-secondary,
    .btn-danger {
        flex: 1;
    }

    .expense-item {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .expense-right {
        justify-content: space-between;
    }
}