/* ═══ QR Studio Page ═══ */
.qr-page { flex: 1; padding: 80px 24px 60px; max-width: 1100px; margin: 0 auto; width: 100%; }
.qr-page h1 { font-size: 1.75rem; font-weight: 700; letter-spacing: -.03em; margin-bottom: 6px; }
.qr-page .qr-sub { color: var(--text-secondary); font-size: .9375rem; margin-bottom: 32px; }
.qr-layout { display: grid; grid-template-columns: 1fr 380px; gap: 32px; align-items: start; }
.qr-controls { display: flex; flex-direction: column; gap: 20px; }
.qr-section { background: var(--bg-raised); border: 1px solid var(--border); border-radius: var(--radius-m); padding: 20px; }
.qr-section-title { font-size: .6875rem; font-weight: 600; text-transform: uppercase; letter-spacing: .07em; color: var(--text-tertiary); margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
.qr-section-title svg { width: 14px; height: 14px; }
.qr-tabs { display: flex; gap: 4px; margin-bottom: 16px; background: var(--bg-elevated); border-radius: var(--radius-s); padding: 3px; }
.qr-tab { flex: 1; padding: 8px 12px; border-radius: 7px; font-size: .8125rem; font-weight: 500; color: var(--text-tertiary); text-align: center; cursor: pointer; transition: all .15s ease; }
.qr-tab:hover { color: var(--text-secondary); }
.qr-tab.active { background: var(--bg-surface); color: var(--text-primary); box-shadow: var(--shadow-sm); }
.qr-color-row { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.qr-color-row label { font-size: .8125rem; color: var(--text-secondary); min-width: 80px; }
.qr-color-swatch { width: 36px; height: 36px; border-radius: var(--radius-xs); border: 2px solid var(--border-light); cursor: pointer; position: relative; overflow: hidden; flex-shrink: 0; }
.qr-color-swatch input[type="color"] { position: absolute; inset: -8px; width: calc(100% + 16px); height: calc(100% + 16px); cursor: pointer; border: none; }
.qr-dot-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.qr-dot-option { padding: 10px 6px; border: 1px solid var(--border); border-radius: var(--radius-s); text-align: center; cursor: pointer; font-size: .6875rem; font-weight: 500; color: var(--text-tertiary); transition: all .15s ease; display: flex; flex-direction: column; align-items: center; gap: 5px; }
.qr-dot-option:hover { border-color: var(--border-focus); color: var(--text-secondary); }
.qr-dot-option.active { border-color: var(--accent); color: var(--accent); background: var(--accent-subtle); }
.qr-dot-option .dot-preview { width: 20px; height: 20px; display: flex; align-items: center; justify-content: center; }
.qr-corner-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.qr-corner-option { padding: 10px 8px; border: 1px solid var(--border); border-radius: var(--radius-s); text-align: center; cursor: pointer; font-size: .6875rem; font-weight: 500; color: var(--text-tertiary); transition: all .15s ease; }
.qr-corner-option:hover { border-color: var(--border-focus); color: var(--text-secondary); }
.qr-corner-option.active { border-color: var(--accent); color: var(--accent); background: var(--accent-subtle); }
.qr-range-row { display: flex; align-items: center; gap: 12px; }
.qr-range-row label { font-size: .8125rem; color: var(--text-secondary); min-width: 60px; }
.qr-range-row input[type="range"] { flex: 1; height: 3px; -webkit-appearance: none; appearance: none; background: var(--bg-surface); border-radius: 2px; cursor: pointer; }
.qr-range-row input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 14px; height: 14px; border-radius: 50%; background: var(--text-primary); cursor: pointer; }
.qr-range-row .range-val { font-family: var(--mono); font-size: .75rem; color: var(--text-faint); min-width: 28px; text-align: right; }
.qr-ec-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.qr-ec-option { padding: 8px; border: 1px solid var(--border); border-radius: var(--radius-s); text-align: center; cursor: pointer; font-size: .75rem; font-weight: 600; font-family: var(--mono); color: var(--text-tertiary); transition: all .15s ease; }
.qr-ec-option:hover { border-color: var(--border-focus); color: var(--text-secondary); }
.qr-ec-option.active { border-color: var(--accent); color: var(--accent); background: var(--accent-subtle); }
.qr-ec-hint { font-size: .6875rem; color: var(--text-faint); margin-top: 8px; }
.qr-logo-area { display: flex; align-items: center; gap: 14px; margin-top: 8px; }
.qr-logo-preview { width: 64px; height: 64px; border-radius: var(--radius-s); background: var(--bg-elevated); border: 1px dashed var(--border-light); display: flex; align-items: center; justify-content: center; overflow: hidden; cursor: pointer; position: relative; flex-shrink: 0; }
.qr-logo-preview img { width: 100%; height: 100%; object-fit: contain; }
.qr-logo-preview svg { width: 20px; height: 20px; color: var(--text-faint); }
.qr-logo-preview input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.qr-logo-actions { display: flex; flex-direction: column; gap: 8px; }
.qr-upload-zone { border: 1px dashed var(--border-light); border-radius: var(--radius-s); padding: 20px; text-align: center; cursor: pointer; position: relative; transition: all .15s ease; }
.qr-upload-zone:hover { border-color: var(--border-focus); background: rgba(255,255,255,.02); }
.qr-upload-zone input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.qr-upload-zone .label { font-size: .8125rem; color: var(--text-tertiary); }
.qr-upload-zone .hint { font-size: .6875rem; color: var(--text-faint); margin-top: 4px; }
.qr-upload-thumb { margin-top: 10px; max-height: 80px; border-radius: var(--radius-xs); object-fit: contain; display: inline-block; }
.qr-wifi-form { display: flex; flex-direction: column; gap: 12px; }
.qr-wifi-enc-row { display: flex; gap: 6px; }
.qr-wifi-enc-option { flex: 1; padding: 8px; border: 1px solid var(--border); border-radius: var(--radius-s); text-align: center; cursor: pointer; font-size: .75rem; font-weight: 500; color: var(--text-tertiary); transition: all .15s ease; }
.qr-wifi-enc-option:hover { border-color: var(--border-focus); }
.qr-wifi-enc-option.active { border-color: var(--accent); color: var(--accent); background: var(--accent-subtle); }
.qr-preview-panel { position: sticky; top: 80px; }
.qr-preview-card { background: var(--bg-raised); border: 1px solid var(--border); border-radius: var(--radius-l); padding: 28px; text-align: center; }
.qr-canvas-wrap { width: 100%; aspect-ratio: 1; background: #fff; border-radius: var(--radius-m); margin-bottom: 20px; display: flex; align-items: center; justify-content: center; overflow: hidden; position: relative; }
.qr-canvas-wrap.transparent-bg { background: repeating-conic-gradient(#e0e0e0 0% 25%, #fff 0% 50%) 50% / 16px 16px; }
.qr-canvas-wrap canvas { width: 100%; height: 100%; image-rendering: pixelated; }
.qr-download-row { display: flex; gap: 8px; }
.qr-download-row button { flex: 1; padding: 12px; border-radius: var(--radius-s); font-weight: 600; font-size: .8125rem; transition: all .15s ease; display: flex; align-items: center; justify-content: center; gap: 6px; }
.qr-download-row button svg { width: 14px; height: 14px; }
.qr-download-row .btn-dl-png { background: var(--text-primary); color: var(--bg); }
.qr-download-row .btn-dl-png:hover { opacity: .85; }
.qr-download-row .btn-dl-svg { background: var(--bg-elevated); color: var(--text-secondary); border: 1px solid var(--border); }
.qr-download-row .btn-dl-svg:hover { background: var(--bg-surface); color: var(--text-primary); }
.qr-gradient-row { display: flex; align-items: center; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
.qr-gradient-row .qr-color-swatch { width: 32px; height: 32px; }
.qr-gradient-dir { display: flex; gap: 4px; }
.qr-gradient-dir button { width: 28px; height: 28px; border-radius: var(--radius-xs); border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; font-size: .625rem; color: var(--text-tertiary); transition: all .15s ease; }
.qr-gradient-dir button:hover { border-color: var(--border-focus); }
.qr-gradient-dir button.active { border-color: var(--accent); color: var(--accent); background: var(--accent-subtle); }
@media (max-width: 820px) { .qr-layout { grid-template-columns: 1fr; } .qr-preview-panel { position: static; order: -1; max-width: 380px; margin: 0 auto; width: 100%; } }
@media (max-width: 640px) { .qr-page { padding: 72px 16px 40px; } .qr-dot-grid { grid-template-columns: repeat(3, 1fr); } }