:root {
    --primary: #6366F1;
    --primary-hover: #4F46E5;
    --secondary: #8B5CF6;
    --accent: #22D3EE;
    --bg: #0F1219;
    --surface: #1A1D27;
    --surface-hover: #222634;
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --border: rgba(99, 102, 241, 0.2);
    --border-focus: rgba(34, 211, 238, 0.5);
    --radius: 12px;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --transition: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg);
    background-image:
        radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(139, 92, 246, 0.08) 0%, transparent 40%);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    padding: 2rem 1rem;
}

.app-container {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.mono {
    font-family: 'JetBrains Mono', monospace;
}

/* Glassmorphism Helpers */
.glass-panel {
    background: rgba(26, 29, 39, 0.6);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

/* Header */
.header {
    text-align: center;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: 0.5rem;
}

.accent-text {
    color: var(--accent);
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

/* Tabs */
.tabs {
    display: flex;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    margin-bottom: 1.5rem;
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    padding: 1rem;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.02);
}

.tab-btn.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.tab-content {
    display: none;
    padding: 0 1.5rem 1.5rem;
}

.tab-content.active {
    display: block;
    animation: fadeIn 300ms ease forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }

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

/* Controls */
.controls {
    overflow: hidden;
}

.control-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.control-group label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.flex-between {
    display: flex;
    justify-content: space-between;
}

.form-input {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
    width: 100%;
}

.form-input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 2px rgba(34, 211, 238, 0.1);
}

.short-input {
    width: 100px;
}

select.form-input {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394A3B8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

.custom-input {
    resize: vertical;
}

/* Segmented Control */
.segmented-control {
    display: flex;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    padding: 0.25rem;
}

.segment {
    flex: 1;
    background: transparent;
    border: none;
    padding: 0.6rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 6px;
    transition: var(--transition);
}

.segment:hover {
    color: var(--text-primary);
}

.segment.active {
    background: var(--surface-hover);
    color: var(--text-primary);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Slider */
.slider {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    outline: none;
    margin: 10px 0;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(34, 211, 238, 0.4);
    transition: var(--transition);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

/* Checkboxes & Options row */
.options-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem 0 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-secondary);
    user-select: none;
    transition: var(--transition);
}

.checkbox-label:hover {
    color: var(--text-primary);
}

.checkbox-label input {
    display: none;
}

.checkbox-custom {
    width: 20px;
    height: 20px;
    border-radius: 6px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    position: relative;
    transition: var(--transition);
    background: rgba(0, 0, 0, 0.2);
}

.checkbox-label input:checked~.checkbox-custom {
    background: var(--primary);
    border-color: var(--primary);
}

.checkbox-label input:checked~.checkbox-custom::after {
    content: '';
    position: absolute;
    top: 4px;
    left: 3px;
    width: 10px;
    height: 5px;
    border-left: 2px solid white;
    border-bottom: 2px solid white;
    transform: rotate(-45deg);
}

.char-limit-wrapper {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-left: auto;
}

.char-limit-wrapper label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Data Mock tab special */
.data-toggles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
}

.amount-group {
    justify-content: center;
}

/* Button */
.primary-btn {
    width: calc(100% - 3rem);
    margin: 0 1.5rem 1.5rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 8px;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

.primary-btn:active {
    transform: translateY(0);
}

/* Output Area */
.output-area {
    display: flex;
    flex-direction: column;
}

.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.output-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

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

.meta-info {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-family: inherit;
    background: rgba(0, 0, 0, 0.2);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
}

.icon-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    border-radius: 8px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.output-content {
    padding: 1.5rem;
    max-height: 500px;
    overflow-y: auto;
}

.output-content::-webkit-scrollbar {
    width: 8px;
}

.output-content::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

#output-text {
    font-family: inherit;
    font-size: 1.05rem;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: var(--text-primary);
}

#output-text.json-output {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    color: #a6e22e;
    /* JSON styling */
}

.placeholder-empty {
    color: var(--text-secondary) !important;
    font-style: italic;
    justify-content: center;
    display: flex;
    padding: 2rem 0;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--surface-hover);
    color: var(--accent);
    padding: 0.75rem 1.5rem;
    border-radius: 24px;
    font-weight: 500;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    opacity: 0;
    transition: all 300ms cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 1000;
}

.toast.visible {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

@media (max-width: 640px) {
    .options-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .char-limit-wrapper {
        margin-left: 0;
        width: 100%;
        margin-top: 0.5rem;
    }
}