:root {
    --navy-primary: #00b4a6;
    --navy-secondary: #4dd0e1;
    --navy-light: #80cbc4;
    --navy-dark: #006064;
    --white: #ffffff;
    --light-gray: #f5f7fa;
    --medium-gray: #e1e5e9;
    --dark-gray: #64748b;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --white: #0f172a;
    --light-gray: #1e293b;
    --medium-gray: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--white);
    color: var(--text-primary);
    transition: var(--transition);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Start Screen Styles */
.start-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--navy-primary), var(--navy-secondary));
    position: relative;
    overflow: hidden;
}

.start-screen::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E") repeat;
    animation: float 20s ease-in-out infinite;
}

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

.start-content {
    text-align: center;
    color: white;
    z-index: 1;
    max-width: 500px;
    padding: 2rem;
}

.start-logo {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: white;
}

.start-logo .tally {
    color: #4dd0e1;
}

.start-subtitle {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    line-height: 1.6;
}

.start-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.start-btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    text-decoration: none;
}

.start-btn-primary {
    background-color: white;
    color: var(--navy-primary);
}

.start-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 255, 255, 0.3);
}

.start-btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

.start-btn-secondary:hover {
    background-color: white;
    color: var(--navy-primary);
}

.theme-toggle-start {
    position: absolute;
    top: 2rem;
    right: 2rem;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.theme-toggle-start:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

/* Onboarding Screen */
.onboarding-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--light-gray);
    padding: 2rem;
}

.onboarding-container {
    max-width: 800px;
    width: 100%;
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.onboarding-header {
    background: linear-gradient(135deg, var(--navy-primary), var(--navy-secondary));
    color: white;
    padding: 2rem;
    text-align: center;
}

.onboarding-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.onboarding-header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.onboarding-chat {
    height: 500px;
    display: flex;
    flex-direction: column;
}

.onboarding-messages {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.onboarding-controls {
    padding: 1.5rem;
    border-top: 1px solid var(--medium-gray);
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.onboarding-btn {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.onboarding-btn-primary {
    background-color: var(--navy-primary);
    color: white;
}

.onboarding-btn-primary:hover {
    background-color: var(--navy-secondary);
}

.onboarding-btn-secondary {
    background-color: var(--medium-gray);
    color: var(--text-primary);
}

.onboarding-btn-secondary:hover {
    background-color: var(--dark-gray);
    color: white;
}

/* Header */
.header {
    background-color: var(--navy-primary);
    color: white;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 2rem;
    font-weight: 700;
    color: white;
    text-decoration: none;
}

.logo .tally {
    color: #4dd0e1;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle {
    background: none;
    border: 2px solid white;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.theme-toggle:hover {
    background-color: white;
    color: var(--navy-primary);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Main Layout */
.main-layout {
    height: calc(100vh - 80px);
    margin-top: 80px;
}

/* Sidebar */
.sidebar {
    background-color: var(--light-gray);
    border-right: 1px solid var(--medium-gray);
    padding: 2rem 0;
    height: calc(100vh - 80px);
    position: fixed;
    top: 80px;
    left: 0;
    width: 300px;
    z-index: 100;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.sidebar nav {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.sidebar-nav {
    list-style: none;
    flex: 1;
}

.sidebar-nav li {
    margin-bottom: 0.5rem;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    background-color: var(--navy-primary);
    color: white;
}

.sidebar-nav i {
    width: 20px;
    text-align: center;
}

.sidebar-footer {
    margin-top: auto;
    padding: 1rem 0;
}

.sidebar-divider {
    border: none;
    height: 1px;
    background-color: var(--medium-gray);
    margin: 1rem 1.5rem;
}

.main-app-link {
    color: var(--navy-primary) !important;
    font-weight: 600 !important;
}

.main-app-link:hover {
    background-color: var(--navy-primary) !important;
    color: white !important;
}

/* Main Content */
.main-content {
    margin-left: 300px;
    padding: 2rem;
    background-color: var(--white);
    height: calc(100vh - 80px);
    overflow-y: auto;
    width: calc(100% - 300px);
}

.page {
    display: none;
}

.page.active {
    display: block;
    animation: fadeIn 0.3s ease-in;
}

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

.page-header {
    margin-bottom: 2rem;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--navy-primary);
}

.page-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Cards */
.card {
    background-color: var(--light-gray);
    border: 1px solid var(--medium-gray);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    margin-bottom: 1.5rem;
}

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

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.card-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--navy-primary);
}

.card-icon {
    color: var(--navy-secondary);
    font-size: 1.2rem;
}

/* Budget Overview */
.budget-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: linear-gradient(135deg, var(--navy-primary), var(--navy-secondary));
    color: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    text-align: center;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* Progress Bars */
.progress-bar {
    background-color: var(--medium-gray);
    border-radius: 50px;
    height: 10px;
    overflow: hidden;
    margin: 1rem 0;
}

.progress-fill {
    height: 100%;
    background-color: var(--navy-primary);
    transition: width 0.5s ease;
    border-radius: 50px;
}

.progress-fill.warning {
    background-color: var(--warning);
}

.progress-fill.danger {
    background-color: var(--danger);
}

/* Chat Interface */
.chat-container {
    display: flex;
    flex-direction: column;
    height: 600px;
    background-color: var(--light-gray);
    border-radius: var(--border-radius);
    border: 1px solid var(--medium-gray);
}

.chat-header {
    background-color: var(--navy-primary);
    color: white;
    padding: 1rem;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.chat-messages {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message {
    max-width: 80%;
    padding: 1rem;
    border-radius: var(--border-radius);
    animation: slideIn 0.3s ease;
}

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

.message.user {
    align-self: flex-end;
    background-color: var(--navy-primary);
    color: white;
}

.message.ai {
    align-self: flex-start;
    background-color: var(--white);
    border: 1px solid var(--medium-gray);
    color: var(--text-primary);
}

.chat-input-container {
    padding: 1rem;
    border-top: 1px solid var(--medium-gray);
    display: flex;
    gap: 0.5rem;
}

.chat-input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--medium-gray);
    border-radius: 50px;
    outline: none;
    font-size: 1rem;
}

.chat-send {
    background-color: var(--navy-primary);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
}

.chat-send:hover {
    background-color: var(--navy-secondary);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    justify-content: center;
}

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

.btn-primary:hover {
    background-color: var(--navy-secondary);
}

.btn-secondary {
    background-color: var(--medium-gray);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: var(--dark-gray);
    color: white;
}

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

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

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

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

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--medium-gray);
    border-radius: var(--border-radius);
    font-size: 1rem;
    background-color: var(--white);
    color: var(--text-primary);
}

.form-input:focus {
    outline: none;
    border-color: var(--navy-primary);
    box-shadow: 0 0 0 3px rgba(0, 180, 166, 0.1);
}

/* Expense List */
.expense-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background-color: var(--white);
    border: 1px solid var(--medium-gray);
    border-radius: var(--border-radius);
    margin-bottom: 0.5rem;
    transition: var(--transition);
}

.expense-item:hover {
    box-shadow: var(--shadow);
}

.expense-details {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.expense-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--navy-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
}

.expense-info h4 {
    margin: 0;
    color: var(--text-primary);
}

.expense-info p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

/* Badge */
.badge {
    background-color: var(--success);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
}

.ml-auto {
    margin-left: auto;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-warning {
    background-color: #fef3c7;
    color: #92400e;
    border: 1px solid #fde68a;
}

.alert-danger {
    background-color: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

/* Charts */
.chart-container {
    background-color: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.chart-placeholder {
    height: 300px;
    background-color: var(--light-gray);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Horizontal Form Layout for Expenses */
.expense-form-row {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
    margin-bottom: 1rem;
}

.expense-form-row .form-group {
    margin-bottom: 0;
}

.expense-form-row .form-group:first-child {
    flex: 1;
}

.expense-form-row .form-group:nth-child(2) {
    width: 120px;
}

.expense-form-row .form-group:nth-child(3) {
    width: 150px;
}

/* Screen visibility */
.screen {
    display: none;
}

.screen.active {
    display: block;
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-layout {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: fixed;
        left: -300px;
        top: 80px;
        width: 300px;
        z-index: 999;
        transition: left 0.3s ease;
        background-color: var(--white);
        border-right: 1px solid var(--medium-gray);
        box-shadow: var(--shadow-lg);
    }

    .sidebar.open {
        left: 0;
    }

    .menu-toggle {
        display: block;
    }

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

    .page-title {
        font-size: 2rem;
    }

    .logo {
        font-size: 1.5rem;
    }

    .start-logo {
        font-size: 3rem;
    }

    .start-buttons {
        gap: 0.75rem;
    }

    .theme-toggle-start {
        top: 1rem;
        right: 1rem;
    }

    .onboarding-screen {
        padding: 1rem;
    }

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

    .expense-form-row {
        flex-direction: column;
        align-items: stretch;
    }

    .expense-form-row .form-group:first-child,
    .expense-form-row .form-group:nth-child(2),
    .expense-form-row .form-group:nth-child(3) {
        width: 100%;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.flex { display: flex; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.hidden { display: none; }

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    transform: translateY(-20px);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--medium-gray);
}

.modal-header h3 {
    margin: 0;
    color: var(--navy-primary);
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background-color: var(--medium-gray);
    color: var(--text-primary);
}

.modal-body {
    padding: 2rem 1.5rem;
    text-align: center;
}

.modal-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--navy-primary), var(--navy-secondary));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 1.5rem auto;
}

.modal-body p {
    margin: 0 0 1rem 0;
    color: var(--text-primary);
    line-height: 1.6;
}

.modal-note {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
}

.modal-footer {
    display: flex;
    gap: 1rem;
    padding: 1.5rem;
    border-top: 1px solid var(--medium-gray);
    justify-content: flex-end;
}

.modal-footer .btn {
    min-width: 120px;
}