:root {
    /* Light Theme Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-card: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    --border-color: #e2e8f0;
    --shadow-light: rgba(0, 0, 0, 0.05);
    --shadow-medium: rgba(0, 0, 0, 0.1);
    --shadow-heavy: rgba(0, 0, 0, 0.15);
    
    /* Accent Colors */
    --accent-teal: #14b8a6;
    --accent-purple: #8b5cf6;
    --accent-blue: #3b82f6;
    --accent-cyan: #06b6d4;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;
    
    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(255, 255, 255, 0.18);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.1);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Typography Scale - All minimum 18px */
    --font-sm: 18px;
    --font-base: 20px;
    --font-lg: 22px;
    --font-xl: 26px;
    --font-2xl: 32px;
    --font-3xl: 38px;
    --font-4xl: 48px;
    --font-5xl: 56px;
}

[data-theme="dark"] {
    --bg-primary: #1a1d29;
    --bg-secondary: #252837;
    --bg-tertiary: #2d3142;
    --bg-card: #323544;
    --text-primary: #ffffff;
    --text-secondary: #b8bcc8;
    --text-tertiary: #9ca3af;
    --border-color: #3d4152;
    --shadow-light: rgba(0, 0, 0, 0.2);
    --shadow-medium: rgba(0, 0, 0, 0.3);
    --shadow-heavy: rgba(0, 0, 0, 0.4);
    --glass-bg: rgba(50, 53, 68, 0.8);
    --glass-border: rgba(184, 188, 200, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    font-size: var(--font-base);
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(20, 184, 166, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(59, 130, 246, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

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

/* Header Styles */
.app-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-lg) var(--spacing-xl);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-light);
}

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

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.logo-icon {
    width: 56px;
    height: 56px;
    background: var(--accent-teal);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: 0 4px 12px rgba(20, 184, 166, 0.2);
}

.logo-section h1 {
    font-size: var(--font-3xl);
    font-weight: 700;
    color: var(--accent-teal);
}

.theme-toggle {
    width: 56px;
    height: 56px;
    border: none;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    color: var(--text-secondary);
}

.theme-toggle:hover {
    background: var(--bg-card);
    transform: scale(1.05);
    border-color: var(--accent-teal);
    color: var(--accent-teal);
}

/* Main Container */
.main-container {
    flex: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
}

@media (max-width: 1024px) {
    .main-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        padding: var(--spacing-lg);
    }
}

/* Glass Card Styles */
.glass-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-light);
    margin-bottom: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.glass-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    border-color: var(--accent-teal);
}

.gradient-border {
    position: relative;
    background: var(--bg-card);
    border: 2px solid var(--accent-teal);
}

.gradient-border::before {
    display: none;
}

/* Card Headers */
.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.card-header.collapsible {
    cursor: pointer;
    padding: var(--spacing-sm);
    margin: calc(-1 * var(--spacing-sm));
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.card-header.collapsible:hover {
    background: var(--bg-tertiary);
}

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

.title-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.traffic-icon {
    background: var(--accent-teal);
}

.section-title h2,
.card-header h3 {
    font-size: var(--font-xl);
    font-weight: 600;
    color: var(--text-primary);
}

/* Toggle Switches */
.toggle-switch {
    position: relative;
    width: 60px;
    height: 32px;
}

.toggle-switch input[type="checkbox"] {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-switch label {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-tertiary);
    border-radius: 32px;
    transition: var(--transition-normal);
}

.toggle-switch label:before {
    position: absolute;
    content: "";
    height: 28px;
    width: 28px;
    left: 2px;
    bottom: 2px;
    background: white;
    border-radius: 50%;
    transition: var(--transition-normal);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.toggle-switch input:checked + label {
    background: var(--accent-teal);
}

.toggle-switch input:checked + label:before {
    transform: translateX(28px);
}

.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.toggle-label {
    font-size: var(--font-base);
    font-weight: 500;
    color: var(--text-secondary);
}

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

.form-label {
    display: block;
    font-size: var(--font-base);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.input-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

@media (max-width: 640px) {
    .input-group {
        grid-template-columns: 1fr;
    }
}

.input-field {
    margin-bottom: var(--spacing-lg);
}

.input-field label {
    display: block;
    font-size: var(--font-base);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-wrapper input {
    width: 100%;
    padding: 16px 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: var(--font-base);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all var(--transition-normal);
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--accent-teal);
    box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.1);
    transform: translateY(-1px);
}

.input-prefix,
.input-suffix {
    position: absolute;
    font-size: var(--font-base);
    font-weight: 500;
    color: var(--text-tertiary);
    pointer-events: none;
}

.input-prefix {
    left: 20px;
}

.input-suffix {
    right: 20px;
}

.input-wrapper:has(.input-prefix) input {
    padding-left: 48px;
}

.input-wrapper:has(.input-suffix) input {
    padding-right: 48px;
}

/* Radio Pills */
.radio-pills {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.radio-pill {
    position: relative;
    cursor: pointer;
}

.radio-pill input[type="radio"] {
    opacity: 0;
    position: absolute;
}

.radio-pill span {
    display: block;
    padding: 12px 20px;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: var(--font-base);
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-normal);
}

.radio-pill input:checked + span {
    background: var(--accent-teal);
    border-color: var(--accent-teal);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(20, 184, 166, 0.2);
}

/* Metric Cards */
.metric-card {
    background: var(--bg-card);
    border: 2px solid var(--accent-teal);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-light);
}

.clicks-card {
    border-color: var(--accent-purple);
}

.metric-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.metric-icon {
    width: 56px;
    height: 56px;
    background: var(--accent-teal);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.clicks-card .metric-icon {
    background: var(--accent-purple);
}

.metric-info {
    flex: 1;
}

.metric-label {
    font-size: var(--font-base);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.metric-value {
    font-size: var(--font-2xl);
    font-weight: 700;
    color: var(--text-primary);
}

/* Performance Card */
.performance-card {
    background: var(--bg-card);
    border: 2px solid var(--accent-green);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-top: var(--spacing-lg);
}

.performance-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    text-align: center;
}

.performance-item {
    color: var(--text-primary);
}

.performance-label {
    font-size: var(--font-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.performance-value {
    font-size: var(--font-xl);
    font-weight: 700;
    color: var(--accent-green);
}

/* Tab Navigation */
.tab-navigation {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
    background: var(--bg-tertiary);
    padding: var(--spacing-sm);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-xl);
    border: 1px solid var(--border-color);
}

@media (max-width: 640px) {
    .tab-navigation {
        grid-template-columns: repeat(2, 1fr);
    }
}

.tab-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 16px 20px;
    background: transparent;
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-base);
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.tab-button:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.tab-button.active {
    background: var(--accent-teal);
    color: white;
    box-shadow: 0 4px 12px rgba(20, 184, 166, 0.2);
}

.tab-icon {
    font-size: var(--font-lg);
}

/* Tab Content */
.tab-content {
    position: relative;
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

/* Upsell Steps */
.upsell-step {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.upsell-step:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    border-color: var(--accent-purple);
}

.step-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.step-name {
    font-size: var(--font-xl);
    font-weight: 600;
    background: transparent;
    border: none;
    color: var(--text-primary);
    outline: none;
    flex: 1;
}

.remove-step-btn {
    width: 40px;
    height: 40px;
    background: var(--accent-red);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.remove-step-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

/* Add Step Button */
.add-step-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    width: 100%;
    padding: var(--spacing-xl);
    background: var(--bg-card);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-xl);
    color: var(--accent-teal);
    font-size: var(--font-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.add-step-btn:hover {
    border-color: var(--accent-teal);
    background: var(--bg-tertiary);
    transform: translateY(-2px);
}

.add-icon {
    width: 28px;
    height: 28px;
    background: var(--accent-teal);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

/* Results Section */
.results-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Summary Grid */
.summary-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

@media (max-width: 640px) {
    .summary-grid {
        grid-template-columns: 1fr;
    }
}

.summary-card {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all var(--transition-normal);
}

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

.income-card {
    border-color: var(--accent-green);
}

.expense-card {
    border-color: var(--accent-orange);
}

.summary-content {
    flex: 1;
}

.summary-label {
    font-size: var(--font-base);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.summary-value {
    font-size: var(--font-2xl);
    font-weight: 700;
    color: var(--text-primary);
}

.income-card .summary-value {
    color: var(--accent-green);
}

.expense-card .summary-value {
    color: var(--accent-orange);
}

.summary-icon {
    width: 56px;
    height: 56px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.income-card .summary-icon {
    background: var(--accent-green);
    color: white;
}

.expense-card .summary-icon {
    background: var(--accent-orange);
    color: white;
}

/* Profit Card */
.profit-card {
    background: var(--bg-card);
    border: 2px solid var(--accent-blue);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-medium);
}

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

.profit-icon {
    width: 72px;
    height: 72px;
    background: var(--accent-blue);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.profit-info {
    flex: 1;
}

.profit-label {
    font-size: var(--font-base);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.profit-value {
    font-size: var(--font-4xl);
    font-weight: 700;
    line-height: 1;
    color: var(--accent-blue);
}

.profit-value.negative {
    color: var(--accent-red);
}

/* Breakdown Card */
.breakdown-card {
    overflow: hidden;
}

.collapse-icon {
    transition: transform var(--transition-normal);
}

.collapse-icon.collapsed {
    transform: rotate(-90deg);
}

.breakdown-content {
    transition: all var(--transition-normal);
    overflow: hidden;
}

.breakdown-content.collapsed {
    max-height: 0;
    opacity: 0;
    margin: 0;
    padding: 0;
}

.metrics-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.metric-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    font-size: var(--font-base);
    transition: all var(--transition-fast);
    border: 1px solid var(--border-color);
}

.metric-row:hover {
    background: var(--bg-card);
    transform: translateX(4px);
    border-color: var(--accent-teal);
}

.metric-name {
    color: var(--text-secondary);
    font-weight: 500;
}

.metric-result {
    color: var(--text-primary);
    font-weight: 600;
    font-size: var(--font-lg);
}

/* Funnel Profit Card */
.funnel-profit-card {
    background: var(--bg-card);
    border: 2px solid var(--accent-purple);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-medium);
}

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

.funnel-profit-value {
    font-size: var(--font-3xl);
    font-weight: 700;
    color: var(--accent-purple);
}

.funnel-profit-value.negative {
    color: var(--accent-red);
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-header {
        padding: var(--spacing-lg);
    }
    
    .header-content {
        flex-direction: column;
        gap: var(--spacing-lg);
        align-items: flex-start;
    }
    
    .logo-section h1 {
        font-size: var(--font-2xl);
    }
    
    .main-container {
        padding: var(--spacing-lg);
    }
    
    .glass-card {
        padding: var(--spacing-lg);
    }
    
    .performance-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .profit-header {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-lg);
    }
    
    .profit-value {
        font-size: var(--font-3xl);
    }
    
    .funnel-profit-value {
        font-size: var(--font-2xl);
    }
}

@media (max-width: 480px) {
    .summary-grid {
        grid-template-columns: 1fr;
    }
    
    .tab-navigation {
        grid-template-columns: 1fr;
    }
    
    .input-group {
        grid-template-columns: 1fr;
    }
    
    .radio-pills {
        flex-direction: column;
    }
}

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

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

.glass-card,
.metric-card,
.summary-card,
.profit-card,
.funnel-profit-card {
    animation: slideIn 0.6s ease-out;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-teal);
    border-radius: var(--radius-md);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-purple);
}