:root {
    /* Light Theme (Stripe Inspired) */
    --slate-900: #0a2540;
    --slate-800: #1a365d;
    --slate-700: #1a4971;
    --slate-400: #6b7280;
    --slate-300: #e2e8f0;
    --slate-100: #f7fafc;
    --slate-50:  #ffffff;
    
    --primary: #635bff;       /* Stripe Blurple */
    --primary-hover: #7a73ff;
    --primary-light: rgba(99, 91, 255, 0.1);
    
    --paypal: #0079C1;
    --paypal-light: rgba(0, 121, 193, 0.1);

    --success: #00d924;
    --danger: #ff003c;
    
    --bg-color: #f6f9fc;      /* Stripe background */
    --surface-color: #ffffff;
    --text-main: var(--slate-900);
    --text-muted: #425466;

    --glass-bg: rgba(255, 255, 255, 0.9);
    --glass-border: rgba(0, 0, 0, 0.05);
    --shadow: 0 50px 100px -20px rgba(50, 50, 93, 0.15), 0 30px 60px -30px rgba(0, 0, 0, 0.15);
    
    --radius: 12px;
    --transition: all 0.2s ease;
}

body.dark {
    --bg-color: #0a2540;
    --surface-color: #1a365d;
    --text-main: #ffffff;
    --text-muted: #adbdcc;

    --glass-bg: rgba(26, 54, 93, 0.7);
    --glass-border: rgba(255, 255, 255, 0.05);
    --shadow: 0 20px 40px rgba(0,0,0,0.3);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    transition: var(--transition);
}

/* Glassmorphism */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

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

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 2rem;
    border-radius: 0;
    border-top: none;
    border-left: none;
    border-right: none;
    z-index: 10;
    box-shadow: 0 4px 6px rgba(50,50,93,0.05);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Buttons */
.btn {
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-family: inherit;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--primary);
    color: white;
}
.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px rgba(50,50,93,0.11), 0 1px 3px rgba(0,0,0,0.08);
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    background: var(--surface-color);
}
.btn-secondary:hover {
    background: var(--slate-100);
}
body.dark .btn-secondary:hover {
    background: rgba(255,255,255,0.05);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}
.btn-outline:hover {
    background: var(--primary-light);
}

.full-width {
    width: 100%;
}

/* Theme Toggle */
.theme-toggle {
    background: transparent;
    border: none;
    color: var(--text-main);
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}
.theme-toggle:hover {
    background: rgba(0,0,0,0.05);
}
body.dark .theme-toggle:hover {
    background: rgba(255,255,255,0.1);
}
.theme-toggle svg { width: 20px; height: 20px; }
body.dark .moon-icon { display: none; }
body:not(.dark) .sun-icon { display: none; }

/* Dashboard Layout */
.dashboard {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 2rem;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.sidebar {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    height: fit-content;
}

.settings-group h2 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
    color: var(--text-muted);
}

/* Input Elements */
.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.input-group label {
    font-size: 0.875rem;
    font-weight: 500;
}

.input-with-prefix {
    display: flex;
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    overflow: hidden;
    background: var(--surface-color);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    transition: var(--transition);
}
.input-with-prefix:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-light);
}

.currency-select {
    border: none;
    background: transparent;
    padding: 0.75rem 0.5rem 0.75rem 1rem;
    color: var(--text-main);
    font-weight: 600;
    cursor: pointer;
    outline: none;
    font-family: inherit;
    -webkit-appearance: none;
    appearance: none;
}

input[type="number"] {
    flex: 1;
    border: none;
    background: transparent;
    padding: 0.75rem 1rem 0.75rem 0.5rem;
    color: var(--text-main);
    font-size: 1rem;
    font-weight: 600;
    outline: none;
    font-family: inherit;
}

.full-select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    background: var(--surface-color);
    color: var(--text-main);
    font-family: inherit;
    outline: none;
    cursor: pointer;
}
.full-select:focus {
    border-color: var(--primary);
}

/* Radio buttons */
.radio-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.radio-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    font-size: 0.875rem;
}
.radio-label input {
    accent-color: var(--primary);
    width: 16px;
    height: 16px;
}

/* Toggle Switch */
.toggle-switch-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
}
.toggle-switch-wrapper .label {
    font-size: 0.875rem;
    font-weight: 500;
}
.toggle-switch {
    position: relative;
    width: 130px;
    height: 32px;
}
.toggle-input {
    opacity: 0;
    width: 0;
    height: 0;
}
.toggle-label {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--slate-300);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 10px;
    border: 1px solid var(--glass-border);
}
body.dark .toggle-label { background-color: var(--slate-800); }
.toggle-text-left, .toggle-text-right {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    z-index: 2;
    transition: color 0.3s ease;
}
.toggle-label::after {
    content: "";
    position: absolute;
    height: 24px;
    width: 60px;
    left: 3px;
    bottom: 3px;
    background-color: var(--surface-color);
    border-radius: 12px;
    transition: transform 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
    z-index: 1;
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}
body.dark .toggle-label::after { background-color: var(--slate-700); }
.toggle-input:checked + .toggle-label::after {
    transform: translateX(62px);
}
.toggle-input:not(:checked) + .toggle-label .toggle-text-left { color: var(--text-main); }
.toggle-input:checked + .toggle-label .toggle-text-right { color: var(--text-main); }

.actions-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1rem;
}

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

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

.result-card {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.result-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 35px rgba(50,50,93,0.1), 0 5px 15px rgba(0,0,0,0.07);
}
body.dark .result-card:hover {
    box-shadow: 0 15px 35px rgba(0,0,0,0.4);
}

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

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 16px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stripe-badge {
    background: var(--primary-light);
    color: var(--primary);
}
.paypal-badge {
    background: var(--paypal-light);
    color: var(--paypal);
}

.fee-rate {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
}

.amount-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
    font-size: 0.9375rem;
}
.row-label {
    color: var(--text-muted);
}
.row-value {
    font-weight: 600;
}
.amount-row.negative .row-value {
    color: var(--danger);
}
.amount-row.highlight .row-value {
    color: var(--primary);
    font-size: 2rem;
}

.divider {
    height: 1px;
    background: var(--glass-border);
    margin: 1rem 0;
}

/* Comparison Table */
.comparison-section {
    padding: 1.5rem;
}
.comparison-section .section-header {
    margin-bottom: 1.5rem;
}
.comparison-section h2 {
    font-size: 1.125rem;
    font-weight: 600;
}

.table-responsive {
    overflow-x: auto;
}
.data-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.875rem;
}
.data-table th, .data-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--glass-border);
}
.data-table th {
    font-weight: 600;
    color: var(--text-muted);
    background: rgba(0,0,0,0.02);
}
body.dark .data-table th {
    background: rgba(255,255,255,0.02);
}
.data-table tr:last-child td {
    border-bottom: none;
}
.positive { color: var(--success); font-weight: 600;}
.negative { color: var(--danger); font-weight: 600;}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(10, 37, 64, 0.5);
    backdrop-filter: blur(4px);
    z-index: 100;
    align-items: center;
    justify-content: center;
}
.modal.show { display: flex; }

.modal-content {
    padding: 2rem;
    max-width: 500px;
    width: 90%;
}
.modal-content h2 { margin-bottom: 0.75rem; }
.modal-content p { color: var(--text-muted); margin-bottom: 1.5rem; font-size: 0.875rem;}
#embedTextarea {
    width: 100%;
    height: 100px;
    padding: 1rem;
    font-family: monospace;
    font-size: 0.875rem;
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    background: var(--surface-color);
    color: var(--text-main);
    resize: none;
    margin-bottom: 1.5rem;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--slate-900);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 1000;
}
body.dark .toast {
    background: var(--slate-50);
    color: var(--slate-900);
}
.toast.show {
    transform: translateY(0);
    opacity: 1;
}

/* Responsive */
@media (max-width: 900px) {
    .dashboard {
        grid-template-columns: 1fr;
        padding: 1rem;
    }
    .results-grid {
        grid-template-columns: 1fr;
    }
}