/* ── Design Tokens (duplicated from main site) ── */
:root {
    --bg-color: #050505;
    --text-main: #e5e5e5;
    --text-muted: #a3a3a3;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-highlight: rgba(255, 255, 255, 0.1);
    --font-main: 'Outfit', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* ── Background Glow ── */
.background-glow {
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(59, 130, 246, 0.08) 0%, rgba(5, 5, 5, 0) 50%);
    z-index: -1;
    animation: pulse 10s ease-in-out infinite alternate;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.5; }
    100% { transform: scale(1.1); opacity: 0.8; }
}

/* ── Gradient Text ── */
.gradient-text {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ── Header ── */
.page-header {
    text-align: center;
    padding: 3rem 1rem 1rem;
}

.page-header h1 {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* ── Glass Card ── */
.glass-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    border-radius: 12px;
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.7rem 1.4rem;
    border-radius: 99px;
    font-family: var(--font-main);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn.primary {
    background: #fff;
    color: #000;
}

.btn.primary:hover {
    background: #e5e5e5;
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(255, 255, 255, 0.2);
}

.btn.secondary {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: #fff;
}

.btn.secondary:hover {
    border-color: var(--glass-highlight);
    background: rgba(255, 255, 255, 0.08);
}

.btn.full-width {
    width: 100%;
}

.btn-row {
    display: flex;
    gap: 0.75rem;
}

.btn-row .btn {
    flex: 1;
}

/* ── Two-Column Layout ── */
.qr-layout {
    display: grid;
    grid-template-columns: minmax(300px, 400px) 1fr;
    gap: 2rem;
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem;
    align-items: start;
}

/* ── Preview Panel ── */
.preview-panel {
    position: sticky;
    top: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

#qr-canvas {
    width: 100%;
    display: flex;
    justify-content: center;
    border-radius: 8px;
    overflow: hidden;
}

#qr-canvas canvas,
#qr-canvas svg {
    width: 100% !important;
    height: auto !important;
}

/* ── Settings Panel ── */
.settings-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* ── Collapsible Sections ── */
.settings-group {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    overflow: hidden;
}

.settings-group summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    list-style: none;
    user-select: none;
    color: #fff;
}

.settings-group summary::-webkit-details-marker {
    display: none;
}

.settings-group summary::after {
    content: '';
    width: 8px;
    height: 8px;
    border-right: 2px solid var(--text-muted);
    border-bottom: 2px solid var(--text-muted);
    transform: rotate(45deg);
    transition: transform 0.2s;
    flex-shrink: 0;
}

.settings-group[open] summary::after {
    transform: rotate(-135deg);
}

.settings-group .fields {
    padding: 0 1.25rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

/* ── Form Controls ── */
label {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

label > span {
    font-size: 0.85rem;
    color: var(--text-muted);
}

input[type="text"],
select {
    width: 100%;
    padding: 0.6rem 0.8rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-main);
    font-family: var(--font-main);
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}

input[type="text"]:focus,
select:focus {
    border-color: var(--accent-blue);
}

select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23a3a3a3' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
}

select option {
    background: #1a1a1a;
    color: var(--text-main);
}

/* Color Picker Combo */
.color-input {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.color-input input[type="color"] {
    width: 40px;
    height: 36px;
    padding: 2px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    cursor: pointer;
    flex-shrink: 0;
}

.color-input input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 2px;
}

.color-input input[type="color"]::-webkit-color-swatch {
    border: none;
    border-radius: 5px;
}

.color-input input[type="text"] {
    flex: 1;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    letter-spacing: 0.03em;
    text-transform: lowercase;
}

/* Range Slider */
input[type="range"] {
    width: 100%;
    accent-color: var(--accent-blue);
    cursor: pointer;
}

output {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: right;
}

/* Checkbox */
.checkbox-label {
    flex-direction: row;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    accent-color: var(--accent-blue);
    width: 16px;
    height: 16px;
    cursor: pointer;
}

/* File Input */
.file-label {
    position: relative;
}

.file-label input[type="file"] {
    position: absolute;
    width: 0;
    height: 0;
    opacity: 0;
    pointer-events: none;
}

.file-btn {
    margin-top: 0.25rem;
}

/* Gradient sub-panel */
.gradient-opts {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
}

.gradient-opts[hidden] {
    display: none;
}

/* ── Footer ── */
footer {
    padding: 3rem 2rem;
    text-align: center;
    border-top: 1px solid var(--glass-border);
    margin-top: 4rem;
}

footer p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .page-header h1 {
        font-size: 2.25rem;
    }

    .qr-layout {
        grid-template-columns: 1fr;
        padding: 1rem;
    }

    .preview-panel {
        position: static;
    }
}