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

html {
    scroll-behavior: smooth;
}

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 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);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(to bottom, #f8fafc 0%, #e2e8f0 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Auth Pages (Login / Register) - Modern design with gradient */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
    overflow: hidden;
}

.auth-page::before {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    top: -250px;
    right: -250px;
    animation: float 6s ease-in-out infinite;
}

.auth-page::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    bottom: -200px;
    left: -200px;
    animation: float 8s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(20px); }
}

.auth-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 3rem 2.5rem;
    border-radius: 1.25rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 420px;
    position: relative;
    z-index: 1;
    animation: slideUp 0.5s ease-out;
}

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

.auth-brand {
    font-size: 0.85rem;
    font-weight: 700;
    color: #667eea;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 1rem;
    text-align: center;
}

.auth-title {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    text-align: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    text-align: center;
    line-height: 1.5;
}

.auth-link {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.auth-link a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.auth-link a:hover {
    color: #764ba2;
    text-decoration: underline;
}

/* Navigation */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: transform 0.3s ease;
}

.nav-brand:hover {
    transform: scale(1.05);
}

.nav-links {
    display: flex;
    gap: 0.5rem;
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.95rem;
}

.nav-links a:hover {
    color: white;
    background-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.nav-links a.active {
    color: white;
    background-color: rgba(255, 255, 255, 0.25);
}

.nav-links span {
    color: rgba(255, 255, 255, 0.9);
    font-weight: 600;
    padding: 0.5rem 1rem;
}

.btn-logout {
    background: rgba(239, 68, 68, 0.9);
    color: white;
    border: 2px solid transparent;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.btn-logout:hover {
    background: #dc2626;
    border-color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* Container */
.container {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 2rem;
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    margin-bottom: 1.5rem;
    transition: all 0.3s ease;
    border: 1px solid rgba(226, 232, 240, 0.8);
}

.card:hover {
    box-shadow: 0 12px 24px -4px rgba(0, 0, 0, 0.12);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #e2e8f0;
}

.card-title {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.875rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
    transition: left 0.3s ease;
}

.btn-primary:hover::before {
    left: 0;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

.btn-primary > * {
    position: relative;
    z-index: 1;
}

.btn-secondary {
    background: #64748b;
    color: white;
}

.btn-secondary:hover {
    background: #475569;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(100, 116, 139, 0.3);
}

.btn-secondary > * {
    position: relative;
    z-index: 1;
}

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
    position: relative;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.form-input,
.form-select {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid #e5e7eb;
    border-radius: 0.75rem;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: #f9fafb;
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: #667eea;
    background: #ffffff;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
    transform: translateY(-1px);
}

.form-input::placeholder {
    color: #9ca3af;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

/* Tables */
.table-container {
    overflow-x: auto;
    border-radius: 0.75rem;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 1rem 1.25rem;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
}

.table th {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    font-weight: 700;
    color: var(--text-primary);
    position: sticky;
    top: 0;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
}

.table tbody tr {
    transition: all 0.2s ease;
}

.table tbody tr:hover {
    background: #f8fafc;
    transform: scale(1.01);
}

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

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    border: none;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

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

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px -4px rgba(0, 0, 0, 0.15);
}

.stat-card.income::before {
    background: linear-gradient(90deg, #10b981, #34d399);
}

.stat-card.expense::before {
    background: linear-gradient(90deg, #ef4444, #f87171);
}

.stat-card.balance::before {
    background: linear-gradient(90deg, #667eea, #764ba2);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.stat-value {
    font-size: 2.25rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-card.income .stat-value {
    background: linear-gradient(135deg, #10b981, #059669);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-card.expense .stat-value {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-card.balance .stat-value {
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-icon {
    font-size: 1rem;
}

/* Alerts */
.alert {
    padding: 1rem 1.25rem;
    border-radius: 0.75rem;
    margin-bottom: 1.5rem;
    display: none;
    font-weight: 500;
    font-size: 0.9rem;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-error {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    color: #991b1b;
    border: 2px solid #fca5a5;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.15);
}

.alert-success {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    color: #065f46;
    border: 2px solid #6ee7b7;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.15);
}

/* Loading */
.loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    font-weight: 500;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* Fade in animation for cards */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
    font-size: 1rem;
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

/* Page Header */
.page-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
}

.page-title {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.page-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Budget Alert Item */
.alert-item {
    padding: 1.25rem;
    margin-bottom: 0.75rem;
    border-radius: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.alert-item:hover {
    transform: translateX(4px);
}

.alert-item.alert-exceeded {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 50%);
    border-left: 4px solid #ef4444;
    border-color: #fca5a5;
}

.alert-item.alert-ok {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 50%);
    border-left: 4px solid #10b981;
    border-color: #6ee7b7;
}

.alert-content {
    flex: 1;
}

.alert-category {
    font-weight: 700;
    font-size: 1.05rem;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.alert-details {
    font-size: 0.875rem;
    color: #64748b;
    margin-top: 0.25rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 1.25rem;
    max-width: 540px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.3s ease-out;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #e2e8f0;
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.modal-close {
    background: #f1f5f9;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.modal-close:hover {
    background: #e2e8f0;
    color: var(--text-primary);
    transform: rotate(90deg);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.badge-success {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    color: #065f46;
    border: 2px solid #6ee7b7;
}

.badge-danger {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    color: #991b1b;
    border: 2px solid #fca5a5;
}

.badge-warning {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    color: #92400e;
    border: 2px solid #fcd34d;
}

/* Smaller badge variant for tables */
.table .badge {
    padding: 0.35rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Charts */
.chart-container {
    position: relative;
    height: 400px;
    margin-top: 1rem;
}

/* Password Toggle */
.password-wrapper {
    position: relative;
}

.password-toggle {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: #9ca3af;
    padding: 0.25rem;
    transition: color 0.3s ease;
}

.password-toggle:hover {
    color: #667eea;
}

/* Divider */
.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 1.5rem 0;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid #e5e7eb;
}

.divider::before {
    margin-right: 0.75rem;
}

.divider::after {
    margin-left: 0.75rem;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar {
        padding: 1rem;
    }

    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-brand {
        font-size: 1.25rem;
    }

    .nav-links {
        flex-wrap: wrap;
        gap: 0.5rem;
        justify-content: center;
    }

    .nav-links a,
    .nav-links span {
        padding: 0.4rem 0.8rem;
        font-size: 0.85rem;
    }

    .btn-logout {
        padding: 0.4rem 0.8rem;
        font-size: 0.85rem;
    }

    .container {
        padding: 0 1rem;
        margin: 1rem auto;
    }

    .page-title {
        font-size: 1.5rem;
    }

    .page-subtitle {
        font-size: 0.9rem;
    }

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

    .stat-card {
        padding: 1.5rem;
    }

    .stat-value {
        font-size: 1.75rem;
    }

    .card {
        padding: 1.5rem;
    }

    .card-title {
        font-size: 1.125rem;
    }

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

    .auth-card {
        padding: 2rem 1.5rem;
        max-width: 380px;
    }

    .auth-title {
        font-size: 1.75rem;
    }

    .auth-page::before,
    .auth-page::after {
        display: none;
    }

    .chart-container {
        height: 300px;
    }
}

/* Categories Grid */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.category-card {
    background: var(--card-bg);
    border-radius: 1rem;
    padding: 1.5rem;
    border: 2px solid #e2e8f0;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px -4px rgba(0, 0, 0, 0.15);
    border-color: #667eea;
}

.category-header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
}

.category-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.category-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.category-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.category-budgets {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding-top: 0.75rem;
    border-top: 1px solid #e2e8f0;
}

.budget-item {
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.budget-item strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Filter Section */
.filter-section {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    padding: 1.5rem;
    border-radius: 0.75rem;
    margin-bottom: 1.5rem;
    border: 1px solid #e2e8f0;
}

/* OTP Input Styling */
.otp-input {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.5rem;
    font-family: 'Courier New', Courier, monospace;
}

.otp-input:focus {
    letter-spacing: 0.5rem;
}

.otp-message {
    margin-bottom: 1.5rem;
    animation: slideDown 0.4s ease-out;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }