:root {
    --primary: #D0F72D;
    /* Neon Green from image */
    --primary-hover: #BCE025;
    --primary-text: #1a1a1a;
    --secondary: #1a1a1a;
    --background: #FFFFFF;
    --surface: #FFFFFF;
    --surface-hover: #F8F9FA;
    --text: #111827;
    --text-muted: #6B7280;
    --border: #E5E7EB;
    --success: #10B981;
    --error: #EF4444;
    --radius: 12px;
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px 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);
}

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

body {
    font-family: var(--font-family);
    background-color: var(--background);
    /* Subtle background pattern or gradient if needed, keeping it clean for now */
    background-image: radial-gradient(#E5E7EB 1px, transparent 1px);
    background-size: 24px 24px;
    color: var(--text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem;
}

.app-container {
    width: 100%;
    max-width: 680px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Header */
.main-header {
    text-align: center;
    margin-bottom: 1rem;
    background: white;
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    color: #000;
}

.highlight {
    color: #000;
    /* Keeping it solid based on the image style */
    position: relative;
    z-index: 1;
}

.highlight::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 0;
    width: 100%;
    height: 8px;
    background-color: var(--primary);
    z-index: -1;
    transform: rotate(-2deg);
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Cards */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #FAFAFA;
}

.card-header h2 {
    font-size: 1.1rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text);
}

.card-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.icon {
    font-size: 1.2rem;
}

/* Form Elements */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.row {
    display: flex;
    gap: 1rem;
}

label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

input,
select {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    color: var(--text);
    font-family: var(--font-family);
    font-size: 0.95rem;
    width: 100%;
    transition: all 0.2s;
}

input:focus,
select:focus {
    outline: none;
    border-color: #000;
    box-shadow: 0 0 0 3px rgba(208, 247, 45, 0.4);
    /* Neon focus ring */
}

input.mono {
    font-family: 'Courier New', Courier, monospace;
    letter-spacing: 1px;
    background-color: #F3F4F6;
}

.input-with-action {
    display: flex;
    gap: 0.5rem;
}

.icon-btn {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.5rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
    width: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    background: var(--surface-hover);
    color: var(--text);
    border-color: #000;
}

/* Method Selector */
.method-selector {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
}

.radio-card {
    cursor: pointer;
}

.radio-card input {
    display: none;
}

.radio-card .card-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    gap: 0.5rem;
    transition: all 0.2s;
    height: 100%;
}

.radio-card .emoji {
    font-size: 1.5rem;
}

.radio-card .label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
}

.radio-card input:checked+.card-content {
    background: #FDFDEA;
    /* Very light yellow/green tint */
    border-color: #000;
    box-shadow: 0 4px 0 0 #000;
    /* Retro pop shadow */
    transform: translateY(-2px);
}

.radio-card input:checked+.card-content .label {
    color: #000;
}

/* Credit Card Preview */
.credit-card-preview {
    background: linear-gradient(135deg, #111827 0%, #374151 100%);
    border-radius: 14px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-lg);
    color: white;
    position: relative;
    overflow: hidden;
}

.credit-card-preview::before {
    content: '';
    position: absolute;
    top: -50px;
    right: -50px;
    width: 200px;
    height: 200px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

.chip {
    width: 40px;
    height: 28px;
    background: linear-gradient(135deg, #fbbf24 0%, #d97706 100%);
    border-radius: 6px;
    margin-bottom: 1.5rem;
    position: relative;
}

.card-number-display {
    font-family: 'Courier New', monospace;
    font-size: 1.4rem;
    letter-spacing: 2px;
    margin-bottom: 1.5rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
    color: #fff;
}

.card-details-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.7);
    letter-spacing: 1px;
    font-weight: 600;
}

/* Action Area */
.btn-primary {
    width: 100%;
    background-color: var(--primary);
    color: var(--primary-text);
    border: 2px solid transparent;
    padding: 1rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 4px 12px rgba(208, 247, 45, 0.4);
}

.btn-primary:active {
    transform: translateY(1px);
}

.btn-primary:disabled {
    background-color: #E5E7EB;
    color: #9CA3AF;
    cursor: not-allowed;
    box-shadow: none;
}

/* Loader */
.btn-loader {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    border-top-color: #000;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Result Panel */
.code-block {
    background: #111827;
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 0.85rem;
    color: #D1D5DB;
    font-family: 'Courier New', Courier, monospace;
}

.status-badge {
    padding: 0.25rem 0.6rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
}

.status-badge.success {
    background-color: #DEF7EC;
    color: #03543F;
    border: 1px solid #BCF0DA;
}

.status-badge.error {
    background-color: #FDE8E8;
    color: #9B1C1C;
    border: 1px solid #F8B4B4;
}

.hidden {
    display: none;
}

.badge {
    background: #F3F4F6;
    color: #374151;
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: 1px solid #E5E7EB;
    font-weight: 600;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card {
    animation: fadeIn 0.4s ease-out forwards;
}

.config-panel {
    animation-delay: 0.1s;
}

.order-panel {
    animation-delay: 0.2s;
}

.card-panel {
    animation-delay: 0.3s;
}