/* ============================================
   QR Code Generator & Reader
   ============================================ */

html { background-color: #0d9488; }

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: linear-gradient(135deg, #0d9488 0%, #0f766e 100%);
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(255,255,255,0.04) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255,255,255,0.04) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* ======================
   HEADER
   ====================== */

.header {
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.18);
  padding: var(--space-3) 0;
  flex-shrink: 0;
  position: relative;
  z-index: 10;
}

.header-content { display: flex; align-items: center; gap: var(--space-4); }

.logo-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: white;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.1);
  transition: all var(--transition-base);
  flex-shrink: 0;
}
.logo-link:hover { background: rgba(255,255,255,0.2); transform: translateY(-1px); }
.logo-text { color: white; }
.logo-dot { color: #fbbf24; animation: pulse 2s ease-in-out infinite; }

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.7; transform: scale(1.2); }
}

.title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: rgba(255,255,255,0.9);
  flex: 1;
}

/* ======================
   PAGE BODY
   ====================== */

.page-body {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr;
  grid-template-areas: "content";
  position: relative;
  z-index: 1;
}

.ad-sidebar { display: none; align-self: center; padding: var(--space-4) 0; }
.ad-sidebar-left  { grid-area: ad-left;  justify-self: center; }
.ad-sidebar-right { grid-area: ad-right; justify-self: center; }
.ad-sticky { position: sticky; top: var(--space-4); }
.ad-placeholder {
  display: flex; align-items: center; justify-content: center;
  text-align: center; width: 160px; height: 600px;
  background: rgba(255,255,255,0.08); border: 2px dashed rgba(255,255,255,0.2);
  border-radius: var(--radius-md); color: rgba(255,255,255,0.4);
  font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.05em; line-height: 1.4;
}

.main-content {
  grid-area: content;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-8) var(--space-4);
  gap: var(--space-6);
}

/* ======================
   QR CARD
   ====================== */

.qr-card {
  width: 100%;
  max-width: 480px;
  background: rgba(255,255,255,0.97);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: 0 24px 64px rgba(0,0,0,0.35), 0 0 0 1px rgba(255,255,255,0.15);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

/* ======================
   TYPE SELECTOR
   ====================== */

.type-bar {
  display: flex;
  gap: var(--space-1);
  flex-wrap: wrap;
}

.type-btn {
  padding: 5px var(--space-3);
  background: var(--color-gray-100);
  border: 1.5px solid var(--color-gray-200);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-gray-500);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.type-btn:hover { background: var(--color-gray-200); color: var(--color-gray-700); }
.type-btn.active { background: #0d9488; border-color: #0d9488; color: white; }

.type-form.hidden { display: none; }

/* ======================
   FORMS
   ====================== */

.input-wrap { position: relative; }

.qr-input {
  width: 100%;
  resize: none;
  padding: var(--space-3) var(--space-8) var(--space-3) var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-gray-900);
  background: var(--color-gray-50);
  border: 1.5px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}
.qr-input:focus {
  outline: none;
  border-color: #0d9488;
  box-shadow: 0 0 0 3px rgba(13,148,136,0.12);
  background: white;
}
.qr-input::placeholder { color: var(--color-gray-400); }

.clear-btn {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  width: 24px; height: 24px;
  display: flex; align-items: center; justify-content: center;
  background: var(--color-gray-200);
  border: none; border-radius: var(--radius-full);
  color: var(--color-gray-500);
  font-size: 11px;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.clear-btn:hover { background: var(--color-gray-300); color: var(--color-gray-700); }

.field-grid { display: flex; flex-direction: column; gap: var(--space-2); }

.field-input {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-gray-900);
  background: var(--color-gray-50);
  border: 1.5px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast);
}
.field-input:focus {
  outline: none;
  border-color: #0d9488;
  background: white;
  box-shadow: 0 0 0 3px rgba(13,148,136,0.1);
}
.field-input::placeholder { color: var(--color-gray-400); }

textarea.field-input { resize: none; }

.field-row { display: flex; gap: var(--space-2); }
.field-row .field-input { flex: 1; }

.field-select {
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  background: var(--color-gray-50);
  border: 1.5px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  cursor: pointer;
  white-space: nowrap;
}
.field-select:focus { outline: none; border-color: #0d9488; }

.field-check {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-gray-600);
  cursor: pointer;
  user-select: none;
}

/* ======================
   SETTINGS
   ====================== */

.settings-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.setting-label {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-gray-500);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.ec-buttons { display: flex; gap: 4px; }

.ec-btn {
  width: 34px; height: 30px;
  background: var(--color-gray-100);
  border: 1.5px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  color: var(--color-gray-600);
  font-size: var(--text-xs);
  font-weight: var(--font-bold);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.ec-btn:hover { background: var(--color-gray-200); color: var(--color-gray-800); }
.ec-btn.active {
  background: #0d9488; border-color: #0d9488; color: white;
  box-shadow: 0 2px 6px rgba(13,148,136,0.35);
}

#size-slider {
  width: 110px; height: 4px;
  appearance: none;
  background: var(--color-gray-200);
  border-radius: var(--radius-full);
  outline: none; cursor: pointer;
}
#size-slider::-webkit-slider-thumb {
  appearance: none;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #0d9488;
  cursor: pointer;
  box-shadow: 0 1px 4px rgba(13,148,136,0.4);
  transition: transform var(--transition-fast);
}
#size-slider::-webkit-slider-thumb:hover { transform: scale(1.2); }
#size-slider::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%;
  background: #0d9488; border: none; cursor: pointer;
}

/* Colors */
.color-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.color-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.color-swatch-wrap {
  position: relative;
  width: 32px; height: 32px;
  cursor: pointer;
}

.color-swatch {
  width: 32px; height: 32px;
  border-radius: var(--radius-md);
  border: 2px solid rgba(0,0,0,0.12);
  transition: all var(--transition-fast);
}
.color-swatch-wrap:hover .color-swatch {
  transform: scale(1.1);
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.color-input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%; height: 100%;
  padding: 0; border: none;
}

.color-label {
  font-size: 10px;
  font-weight: var(--font-semibold);
  color: var(--color-gray-400);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.reset-btn {
  width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center;
  background: var(--color-gray-100);
  border: 1.5px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  color: var(--color-gray-500);
  font-size: var(--text-base);
  cursor: pointer;
  transition: all var(--transition-fast);
  align-self: center;
}
.reset-btn:hover { background: var(--color-gray-200); color: var(--color-gray-700); }

.contrast-warning {
  font-size: var(--text-xs);
  color: var(--color-warning);
  font-weight: var(--font-medium);
  align-self: center;
}
.contrast-warning.hidden { display: none; }

/* ======================
   QR PREVIEW
   ====================== */

.qr-preview {
  display: flex;
  align-items: center;
  justify-content: center;
  background: white;
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--color-gray-100);
  min-height: 240px;
  padding: var(--space-4);
  box-shadow: inset 0 1px 4px rgba(0,0,0,0.04);
}

#qr-canvas { display: block; max-width: 100%; aspect-ratio: 1 / 1; border-radius: 4px; }

.qr-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-gray-300);
  text-align: center;
}

.placeholder-grid {
  display: grid;
  grid-template-columns: repeat(3, 22px);
  grid-template-rows: repeat(3, 22px);
  gap: 5px;
}
.placeholder-grid span { border-radius: 4px; background: var(--color-gray-200); }
.placeholder-grid span:nth-child(1),
.placeholder-grid span:nth-child(3),
.placeholder-grid span:nth-child(7),
.placeholder-grid span:nth-child(9) { background: var(--color-gray-300); }

.qr-placeholder p { font-size: var(--text-sm); color: var(--color-gray-400); }

/* ======================
   ACTION ROW
   ====================== */

.action-row { display: flex; gap: var(--space-3); }
.action-row .btn { flex: 1; }

/* ======================
   READ TAB
   ====================== */

/* ── Tab Bar ─────────────────────────────────────────────────────────────── */
.qr-tab-bar {
  display: flex;
  gap: var(--space-2);
  margin-bottom: calc(var(--space-1) * -1);
  border-bottom: 1px solid var(--color-gray-200);
  padding-bottom: var(--space-3);
}
.qr-tab-btn {
  background: var(--color-gray-100);
  border: 1.5px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  color: var(--color-gray-500);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.qr-tab-btn.active {
  background: #0d9488;
  color: white;
  border-color: #0d9488;
}
.qr-tab-btn:hover:not(.active) {
  background: var(--color-gray-200);
  color: var(--color-gray-700);
}

/* ── Reader Panel ─────────────────────────────────────────────────────────── */
.reader-panel { display: flex; flex-direction: column; gap: var(--space-4); }
.reader-panel.hidden { display: none; }

.reader-drop-zone {
  border: 2px dashed var(--color-gray-300);
  border-radius: var(--radius-lg);
  padding: var(--space-10) var(--space-6);
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}
.reader-drop-zone.drag-over {
  border-color: #0d9488;
  background: rgba(13,148,136,0.05);
}
.reader-drop-icon { font-size: 2.5rem; margin-bottom: var(--space-2); }
.reader-drop-text { color: var(--color-gray-600); font-size: var(--text-sm); }
.reader-drop-hint { color: var(--color-gray-400); font-size: var(--text-xs); margin-top: var(--space-1); }
.reader-browse-btn {
  background: none; border: none; color: #0d9488; text-decoration: underline;
  cursor: pointer; font-size: inherit; padding: 0;
}
.reader-result { display: flex; flex-direction: column; gap: var(--space-3); }
.reader-result.hidden { display: none; }
.reader-result-label { color: var(--color-gray-600); font-size: var(--text-sm); font-weight: var(--font-semibold); }
.reader-output {
  width: 100%; min-height: 100px; padding: var(--space-3);
  background: var(--color-gray-50); border: 1.5px solid var(--color-gray-200);
  border-radius: var(--radius-md); color: var(--color-gray-900); font-family: var(--font-mono);
  font-size: var(--text-sm); resize: vertical;
}
.reader-actions { display: flex; gap: var(--space-2); }
.reader-error { color: #dc2626; font-size: var(--text-sm); }
.reader-error.hidden { display: none; }

/* Dark mode — tab bar */
[data-theme="dark"] .qr-tab-bar { border-bottom-color: rgba(255,255,255,0.1); }
[data-theme="dark"] .qr-tab-btn { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.12); color: var(--color-gray-500); }
[data-theme="dark"] .qr-tab-btn:hover:not(.active) { background: rgba(255,255,255,0.12); color: var(--color-gray-300); }
[data-theme="dark"] .qr-tab-btn.active { background: rgba(255,255,255,0.15); border-color: rgba(255,255,255,0.3); color: white; }

/* Dark mode — reader panel */
[data-theme="dark"] .reader-drop-zone { border-color: rgba(255,255,255,0.2); }
[data-theme="dark"] .reader-drop-zone.drag-over { border-color: rgba(255,255,255,0.4); background: rgba(255,255,255,0.05); }
[data-theme="dark"] .reader-drop-text { color: var(--color-gray-400); }
[data-theme="dark"] .reader-browse-btn { color: var(--color-gray-300); }
[data-theme="dark"] .reader-result-label { color: var(--color-gray-400); }
[data-theme="dark"] .reader-output { background: rgba(255,255,255,0.05); border-color: rgba(255,255,255,0.12); color: var(--color-gray-100); }
[data-theme="dark"] .reader-error { color: #fca5a5; }

/* ======================
   STATUS BAR
   ====================== */

.status-bar {
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(10px);
  border-top: 1px solid rgba(255,255,255,0.12);
  padding: var(--space-2) 0;
  flex-shrink: 0;
  position: relative;
  z-index: 10;
}
.status-content { display: flex; align-items: center; gap: var(--space-6); font-size: var(--text-sm); }
.status-item { display: flex; align-items: center; gap: var(--space-2); }
.status-label { color: rgba(255,255,255,0.65); font-weight: var(--font-medium); }
#status-ec, #status-size, #status-text { color: white; font-weight: var(--font-semibold); }

/* ============================================
   WIDE DESKTOP
   ============================================ */

@media (min-width: 1400px) {
  .page-body {
    grid-template-columns: 200px 1fr 200px;
    grid-template-areas: "ad-left content ad-right";
  }
  .ad-sidebar { display: block; }
}

/* ============================================
   MOBILE
   ============================================ */

@media (max-width: 479px) {
  .header { padding: var(--space-2) 0; }
  .title  { font-size: var(--text-sm); }
  .logo-link { font-size: var(--text-sm); padding: var(--space-1) var(--space-2); }
  .main-content { padding: var(--space-4) var(--space-3); gap: var(--space-4); }
  .qr-card { padding: var(--space-4); gap: var(--space-4); }
  .field-row { flex-direction: column; }
  .action-row { flex-direction: column; }
  .status-content { gap: var(--space-3); font-size: var(--text-xs); flex-wrap: wrap; }
}

/* ============================================
   DARK MODE
   ============================================ */

html[data-theme="dark"] { background-color: #0f172a; }
[data-theme="dark"] body { background: #0f172a; }
[data-theme="dark"] .header { background: rgba(0,0,0,0.3); border-bottom-color: rgba(255,255,255,0.08); }

[data-theme="dark"] .qr-card {
  background: rgba(15,23,42,0.95);
  box-shadow: 0 24px 64px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.06);
}

[data-theme="dark"] .type-btn { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.12); color: var(--color-gray-500); }
[data-theme="dark"] .type-btn:hover { background: rgba(255,255,255,0.12); color: var(--color-gray-300); }
[data-theme="dark"] .type-btn.active { background: rgba(255,255,255,0.15); border-color: rgba(255,255,255,0.3); color: white; }

[data-theme="dark"] .qr-input,
[data-theme="dark"] .field-input {
  background: rgba(255,255,255,0.05); border-color: rgba(255,255,255,0.12); color: var(--color-gray-100);
}
[data-theme="dark"] .qr-input:focus,
[data-theme="dark"] .field-input:focus {
  border-color: rgba(255,255,255,0.4); background: rgba(255,255,255,0.08);
}
[data-theme="dark"] .qr-input::placeholder,
[data-theme="dark"] .field-input::placeholder { color: var(--color-gray-600); }

[data-theme="dark"] .field-select { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.12); color: var(--color-gray-300); }
[data-theme="dark"] .field-check { color: var(--color-gray-400); }

[data-theme="dark"] .clear-btn { background: rgba(255,255,255,0.1); color: var(--color-gray-400); }
[data-theme="dark"] .clear-btn:hover { background: rgba(255,255,255,0.18); color: var(--color-gray-200); }

[data-theme="dark"] .setting-label { color: var(--color-gray-500); }

[data-theme="dark"] .ec-btn { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.12); color: var(--color-gray-400); }
[data-theme="dark"] .ec-btn:hover { background: rgba(255,255,255,0.12); color: var(--color-gray-200); }
[data-theme="dark"] .ec-btn.active { background: rgba(255,255,255,0.15); border-color: rgba(255,255,255,0.3); color: white; }

[data-theme="dark"] #size-slider { background: rgba(255,255,255,0.15); }
[data-theme="dark"] #size-slider::-webkit-slider-thumb { background: #2dd4bf; }

[data-theme="dark"] .color-swatch { border-color: rgba(255,255,255,0.15); }
[data-theme="dark"] .color-label { color: var(--color-gray-600); }
[data-theme="dark"] .reset-btn { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.12); color: var(--color-gray-400); }
[data-theme="dark"] .reset-btn:hover { background: rgba(255,255,255,0.12); color: var(--color-gray-200); }

[data-theme="dark"] .qr-preview { background: rgba(15,23,42,0.8); border-color: rgba(255,255,255,0.08); }
[data-theme="dark"] .placeholder-grid span { background: rgba(255,255,255,0.08); }
[data-theme="dark"] .placeholder-grid span:nth-child(1),
[data-theme="dark"] .placeholder-grid span:nth-child(3),
[data-theme="dark"] .placeholder-grid span:nth-child(7),
[data-theme="dark"] .placeholder-grid span:nth-child(9) { background: rgba(255,255,255,0.14); }
[data-theme="dark"] .qr-placeholder p { color: var(--color-gray-600); }


[data-theme="dark"] .status-bar { background: rgba(0,0,0,0.25); border-top-color: rgba(255,255,255,0.08); }
[data-theme="dark"] .ad-placeholder { background: rgba(0,0,0,0.2); border-color: rgba(255,255,255,0.1); }

/* ── About/Related fix: allow scrolling past tool UI ─────────────────────── */
.main-content { overflow-y: auto; }

/* ── Compact header ─────────────────────────────────────────────────────── */
.header { padding: var(--space-1) 0; }
.logo-link { font-size: var(--text-sm); padding: var(--space-1) var(--space-2); }
.title { font-size: var(--text-sm); }

/* ── Mobile: natural page scroll ────────────────────────────────────────── */
@media (max-width: 767px) {
  body { height: auto; min-height: 100vh; overflow-y: auto; }
  .page-body { overflow: visible; }
  .main-content { overflow: visible !important; padding-bottom: var(--space-8); }
}