/* Açık tema — html[data-theme="light"] */
html[data-theme="light"] {
  --bg: #f4f5f8;
  --bg-elevated: #ffffff;
  --bg-card: #ffffff;
  --border: rgba(0, 0, 0, 0.09);
  --text: #161922;
  --text-muted: #5c6370;
  --accent: #b8860b;
  --accent-light: #9a7209;
  --accent-dark: #7a5a07;
  --accent-glow: rgba(184, 134, 11, 0.28);
  --brand-gold: #c9940a;
  --brand-gold-soft: rgba(201, 148, 10, 0.16);
  --brand-gold-muted: rgba(201, 148, 10, 0.1);
  --gradient: linear-gradient(135deg, #9a7209 0%, #c9940a 48%, #d4a017 100%);
  --gradient-text: linear-gradient(135deg, #9a7209 0%, #c9940a 55%, #d4a017 100%);
  --header-bg: rgba(244, 245, 248, 0.94);
  --modal-overlay: rgba(15, 18, 28, 0.45);
  --shadow-color: rgba(0, 0, 0, 0.12);
  --input-bg: #f0f1f5;
  --danger: #dc2626;
}

html[data-theme="light"] .bg-mesh {
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(201, 148, 10, 0.1), transparent),
    radial-gradient(ellipse 60% 40% at 100% 50%, rgba(255, 216, 77, 0.12), transparent),
    radial-gradient(ellipse 50% 30% at 0% 80%, rgba(255, 232, 128, 0.1), transparent);
}

html[data-theme="light"] .grid-overlay {
  background-image:
    linear-gradient(rgba(0, 0, 0, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 0, 0, 0.04) 1px, transparent 1px);
}

html[data-theme="light"] #header {
  background: var(--header-bg);
  border-bottom-color: var(--border);
}

html[data-theme="light"] .logo-img {
  mix-blend-mode: multiply;
  filter: brightness(1) saturate(1.05) drop-shadow(0 2px 8px rgba(184, 134, 11, 0.15));
}

html[data-theme="light"] .logo:hover .logo-img {
  filter: brightness(1.02) saturate(1.08) drop-shadow(0 3px 12px rgba(184, 134, 11, 0.22));
}

html[data-theme="light"] .nav-links {
  box-shadow: 0 16px 40px var(--shadow-color);
}

html[data-theme="light"] .field input,
html[data-theme="light"] .field select,
html[data-theme="light"] .field textarea,
html[data-theme="light"] .form-field input,
html[data-theme="light"] .form-field select,
html[data-theme="light"] .form-field textarea {
  background: var(--input-bg);
}

html[data-theme="light"] .field input::placeholder,
html[data-theme="light"] .form-field input::placeholder,
html[data-theme="light"] .form-field textarea::placeholder,
html[data-theme="light"] .pwd-input-wrap input::placeholder {
  color: rgba(0, 0, 0, 0.38);
}

html[data-theme="light"] .length-controls input[type="range"] {
  background: rgba(0, 0, 0, 0.08);
}

html[data-theme="light"] .modal {
  background: var(--modal-overlay);
}

html[data-theme="light"] .modal-dialog {
  box-shadow: 0 32px 80px var(--shadow-color);
}

html[data-theme="light"] .icon-options-panel {
  background: rgba(0, 0, 0, 0.03);
}

html[data-theme="light"] .form-alert.success {
  color: #166534;
}

html[data-theme="light"] .form-alert.error {
  color: #b91c1c;
}

html[data-theme="light"] .wizard-error {
  color: #b91c1c;
}

html[data-theme="light"] .footer-brand .logo-img {
  mix-blend-mode: multiply;
  filter: brightness(1) saturate(1.05) drop-shadow(0 2px 8px rgba(184, 134, 11, 0.15));
}

html[data-theme="light"] .qr-preview-box,
html[data-theme="light"] .single-preview-wrap {
  box-shadow: 0 8px 24px var(--shadow-color);
}

/* Tema değiştirici — yalnızca ikon */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-sm, 10px);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-muted);
  font-family: inherit;
  cursor: pointer;
  transition: border-color 0.3s ease, color 0.3s ease, background 0.3s ease;
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent-light);
}

.theme-toggle [data-theme-icon] {
  font-size: 1.15rem;
  line-height: 1;
}