:root {
  --bg-base: #cce4ff;
  --bg-surface: rgba(255, 255, 255, 0.38);
  --bg-card: rgba(255, 255, 255, 0.48);
  --bg-input: rgba(210, 232, 255, 0.55);
  --bg-code: rgba(10, 18, 40, 0.92);
  --border-color: rgba(0, 90, 200, 0.14);
  --accent-from: #0077ed;
  --accent-to: #00bcd8;
  --accent-solid: #0070f5;
  --text-primary: #09214a;
  --text-secondary: #2d4a6e;
  --text-muted: #4d6b8a;
  --text-code: #e2e8f0;
  --success: #1a9a50;
  --caution: #c57600;
  --danger: #d42a2a;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 3em;
  --font-size-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.8rem);
  --font-size-sm: clamp(0.78rem, 0.72rem + 0.3vw, 0.9rem);
  --font-size-base: clamp(0.88rem, 0.82rem + 0.3vw, 1rem);
  --font-size-md: clamp(1rem, 0.92rem + 0.4vw, 1.15rem);
  --font-size-lg: clamp(1.15rem, 1.05rem + 0.5vw, 1.35rem);
  --font-size-xl: clamp(1.35rem, 1.2rem + 0.75vw, 1.65rem);
  --font-size-2xl: clamp(1.6rem, 1.35rem + 1.25vw, 2.1rem);
  --font-size-3xl: clamp(1.9rem, 1.55rem + 1.75vw, 2.6rem);
  --font-size-6xl: clamp(2.2rem, 1.6rem + 3vw, 3.6rem);
  --space-xs: clamp(0.25rem, 0.2rem + 0.25vw, 0.4rem);
  --space-sm: clamp(0.4rem, 0.35rem + 0.25vw, 0.55rem);
  --space-md: clamp(0.75rem, 0.65rem + 0.5vw, 1rem);
  --space-lg: clamp(1rem, 0.85rem + 0.75vw, 1.4rem);
  --space-xl: clamp(1.5rem, 1.25rem + 1.25vw, 2.1rem);
  --space-2xl: clamp(2rem, 1.6rem + 2vw, 3rem);
  --transition: 150ms ease;
  --max-width: 1400px;
}

[data-theme=dark] {
  --bg-base: #030c1e;
  --bg-surface: rgba(6, 22, 58, 0.88);
  --bg-card: rgba(8, 28, 68, 0.92);
  --bg-input: rgba(4, 14, 38, 0.92);
  --bg-code: rgba(2, 8, 22, 0.95);
  --border-color: rgba(120, 180, 255, 0.18);
  --accent-from: #4db8ff;
  --accent-to: #22e8ff;
  --accent-solid: #4db8ff;
  --text-primary: #e8f4ff;
  --text-secondary: #90bae0;
  --text-muted: #688aad;
  --success: #30d158;
  --caution: #ffd60a;
  --danger: #ff6b6b;
}

*,
*::before,
*::after {
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-base);
  background-image: radial-gradient(ellipse 100% 70% at 15% -5%, rgba(90, 181, 255, 0.45) 0%, rgba(168, 216, 255, 0.3) 25%, transparent 70%), radial-gradient(ellipse 70% 60% at 95% 110%, rgba(11, 232, 216, 0.35) 0%, rgba(92, 200, 232, 0.2) 20%, transparent 60%), radial-gradient(ellipse 80% 80% at 50% 50%, #d8eeff 0%, transparent 100%);
  color: var(--text-primary);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}
[data-theme=dark] body {
  background-image: radial-gradient(ellipse 90% 70% at 10% -10%, rgba(0, 80, 180, 0.45) 0%, transparent 60%), radial-gradient(ellipse 65% 55% at 95% 110%, rgba(0, 200, 220, 0.22) 0%, transparent 55%), linear-gradient(160deg, #030c1e 0%, #041428 60%, #061a30 100%);
}

a {
  color: var(--accent-solid);
  text-decoration: none;
}

hr {
  border: none;
}

.app-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25em 1.5em 2em;
}

.app-header {
  position: relative;
  text-align: center;
  margin-bottom: 1.25em;
}
.app-header h1 {
  font-size: var(--font-size-6xl);
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-from), var(--accent-to));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.2em;
}
.app-header p {
  color: var(--text-secondary);
  font-size: var(--font-size-md);
}

.header-actions {
  position: absolute;
  top: 0;
  right: 0;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  gap: 0.5em;
}

.main-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25em;
  -webkit-box-align: start;
      -ms-flex-align: start;
          align-items: start;
}
@media (max-width: 900px) {
  .main-layout {
    grid-template-columns: 1fr;
  }
}

.settings-panel {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  gap: var(--space-md);
}

.preview-panel {
  position: sticky;
  top: var(--space-md);
}
@media (max-width: 900px) {
  .preview-panel {
    position: static;
  }
}

.card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-bottom-color: rgba(100, 160, 220, 0.2);
  border-right-color: rgba(100, 160, 220, 0.2);
  border-radius: var(--radius-md);
  padding: 1.5em;
  backdrop-filter: blur(24px) saturate(1.8) brightness(1.05);
  -webkit-backdrop-filter: blur(24px) saturate(1.8) brightness(1.05);
  -webkit-box-shadow: 0 2px 0 rgba(255, 255, 255, 0.9) inset, 2px 0 0 rgba(255, 255, 255, 0.4) inset, 0 8px 32px rgba(0, 80, 160, 0.12), 0 2px 8px rgba(0, 60, 130, 0.08);
          box-shadow: 0 2px 0 rgba(255, 255, 255, 0.9) inset, 2px 0 0 rgba(255, 255, 255, 0.4) inset, 0 8px 32px rgba(0, 80, 160, 0.12), 0 2px 8px rgba(0, 60, 130, 0.08);
}
[data-theme=dark] .card {
  border-color: rgba(120, 180, 255, 0.18);
  border-bottom-color: rgba(60, 120, 200, 0.1);
  border-right-color: rgba(60, 120, 200, 0.1);
  -webkit-box-shadow: 0 2px 0 rgba(120, 180, 255, 0.12) inset, 2px 0 0 rgba(120, 180, 255, 0.06) inset, 0 8px 40px rgba(0, 20, 60, 0.6), 0 2px 12px rgba(0, 10, 40, 0.4);
          box-shadow: 0 2px 0 rgba(120, 180, 255, 0.12) inset, 2px 0 0 rgba(120, 180, 255, 0.06) inset, 0 8px 40px rgba(0, 20, 60, 0.6), 0 2px 12px rgba(0, 10, 40, 0.4);
}

.card-preview {
  padding: var(--space-md);
}

.section-title {
  font-size: var(--font-size-base);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin: 0 0 0.5em;
}

.form-group {
  margin-bottom: 1em;
}
.form-group:last-child {
  margin-bottom: 0;
}

.divider {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 1em 0;
}

.header-link {
  display: -webkit-inline-box;
  display: -ms-inline-flexbox;
  display: inline-flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  gap: 0.4em;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
  padding: 0.4em 0.9em;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  -webkit-box-shadow: 0 1.5px 0 rgba(255, 255, 255, 0.9) inset, 0 4px 12px rgba(0, 0, 0, 0.07);
          box-shadow: 0 1.5px 0 rgba(255, 255, 255, 0.9) inset, 0 4px 12px rgba(0, 0, 0, 0.07);
  -webkit-transition: all var(--transition);
  transition: all var(--transition);
}
.header-link:hover {
  background: rgba(255, 255, 255, 0.72);
  color: var(--accent-solid);
  -webkit-transform: translateY(-1px);
          transform: translateY(-1px);
  -webkit-box-shadow: 0 1.5px 0 rgba(255, 255, 255, 0.9) inset, 0 6px 16px rgba(0, 0, 0, 0.1);
          box-shadow: 0 1.5px 0 rgba(255, 255, 255, 0.9) inset, 0 6px 16px rgba(0, 0, 0, 0.1);
}
.header-link:focus-visible {
  outline: 2px solid var(--accent-solid);
  outline-offset: 2px;
}
[data-theme=dark] .header-link {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.12);
  -webkit-box-shadow: 0 1.5px 0 rgba(255, 255, 255, 0.1) inset, 0 4px 12px rgba(0, 0, 0, 0.3);
          box-shadow: 0 1.5px 0 rgba(255, 255, 255, 0.1) inset, 0 4px 12px rgba(0, 0, 0, 0.3);
}
[data-theme=dark] .header-link:hover {
  background: rgba(255, 255, 255, 0.13);
}

.app-header h1 a {
  background: linear-gradient(135deg, var(--accent-from), var(--accent-to));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
}

.toggle-row {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
  gap: 0.5em;
  padding: 0.5em 0;
}

.toggle-label {
  font-size: var(--font-size-base);
  color: var(--text-primary);
  cursor: pointer;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
  -ms-flex-negative: 0;
      flex-shrink: 0;
}
.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.toggle-track {
  position: absolute;
  inset: 0;
  background: var(--border-color);
  border-radius: 999px;
  -webkit-transition: background var(--transition);
  transition: background var(--transition);
  cursor: pointer;
}
.toggle-track::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  background: #fff;
  border-radius: 50%;
  -webkit-transition: -webkit-transform var(--transition);
  transition: -webkit-transform var(--transition);
  transition: transform var(--transition);
  transition: transform var(--transition), -webkit-transform var(--transition);
}

.toggle-switch input:checked + .toggle-track {
  background: linear-gradient(135deg, var(--accent-from), var(--accent-to));
}
.toggle-switch input:checked + .toggle-track::after {
  -webkit-transform: translateX(18px);
          transform: translateX(18px);
}
.toggle-switch input:focus-visible + .toggle-track {
  outline: 2px solid var(--accent-solid);
  outline-offset: 2px;
}

.preset-group {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
  gap: var(--space-sm);
}

.preset-btn {
  padding: 0.5em 1em;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.2);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  backdrop-filter: blur(12px) saturate(1.4);
  -webkit-backdrop-filter: blur(12px) saturate(1.4);
  -webkit-box-shadow: inset 0 1.5px 1.5px rgba(255, 255, 255, 0.6), inset 0 -1px 1px rgba(0, 0, 0, 0.06), 0 4px 16px rgba(0, 0, 0, 0.08);
          box-shadow: inset 0 1.5px 1.5px rgba(255, 255, 255, 0.6), inset 0 -1px 1px rgba(0, 0, 0, 0.06), 0 4px 16px rgba(0, 0, 0, 0.08);
  -webkit-transition: all var(--transition);
  transition: all var(--transition);
}
.preset-btn:hover {
  background: rgba(255, 255, 255, 0.32);
  color: var(--text-primary);
  -webkit-transform: translateY(-1px);
          transform: translateY(-1px);
  -webkit-box-shadow: inset 0 1.5px 1.5px rgba(255, 255, 255, 0.7), inset 0 -1px 1px rgba(0, 0, 0, 0.06), 0 6px 20px rgba(0, 0, 0, 0.12);
          box-shadow: inset 0 1.5px 1.5px rgba(255, 255, 255, 0.7), inset 0 -1px 1px rgba(0, 0, 0, 0.06), 0 6px 20px rgba(0, 0, 0, 0.12);
}
.preset-btn:active {
  -webkit-transform: translateY(0);
          transform: translateY(0);
  -webkit-box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.06);
          box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.06);
}
.preset-btn:focus-visible {
  outline: 2px solid var(--accent-solid);
  outline-offset: 2px;
}
.preset-btn.active {
  background: linear-gradient(135deg, var(--accent-from), var(--accent-to));
  color: #fff;
  border-color: transparent;
  -webkit-box-shadow: 0 4px 16px rgba(0, 119, 237, 0.3), 0 2px 8px rgba(0, 119, 237, 0.15);
          box-shadow: 0 4px 16px rgba(0, 119, 237, 0.3), 0 2px 8px rgba(0, 119, 237, 0.15);
}

[data-theme=dark] .preset-btn {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.12);
  -webkit-box-shadow: inset 0 1.5px 1.5px rgba(255, 255, 255, 0.1), inset 0 -1px 1px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.3);
          box-shadow: inset 0 1.5px 1.5px rgba(255, 255, 255, 0.1), inset 0 -1px 1px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.3);
}
[data-theme=dark] .preset-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  -webkit-box-shadow: inset 0 1.5px 1.5px rgba(255, 255, 255, 0.14), inset 0 -1px 1px rgba(0, 0, 0, 0.3), 0 6px 20px rgba(0, 0, 0, 0.4);
          box-shadow: inset 0 1.5px 1.5px rgba(255, 255, 255, 0.14), inset 0 -1px 1px rgba(0, 0, 0, 0.3), 0 6px 20px rgba(0, 0, 0, 0.4);
}
[data-theme=dark] .preset-btn:active {
  -webkit-box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.4), 0 2px 8px rgba(0, 0, 0, 0.2);
          box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.4), 0 2px 8px rgba(0, 0, 0, 0.2);
}
[data-theme=dark] .preset-btn.active {
  -webkit-box-shadow: 0 4px 16px rgba(77, 184, 255, 0.25), 0 2px 8px rgba(77, 184, 255, 0.12);
          box-shadow: 0 4px 16px rgba(77, 184, 255, 0.25), 0 2px 8px rgba(77, 184, 255, 0.12);
}

.form-group {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  gap: 0;
}

.input-group {
  margin-top: var(--space-sm);
}

.input-label {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.input-text,
.input-textarea {
  width: 100%;
  padding: 0.5em 0.75em;
  background: var(--bg-input);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-family: monospace;
  -webkit-transition: border-color var(--transition);
  transition: border-color var(--transition);
}
.input-text::-webkit-input-placeholder, .input-textarea::-webkit-input-placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}
.input-text::-moz-placeholder, .input-textarea::-moz-placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}
.input-text:-ms-input-placeholder, .input-textarea:-ms-input-placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}
.input-text::-ms-input-placeholder, .input-textarea::-ms-input-placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}
.input-text::placeholder,
.input-textarea::placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}
.input-text:focus,
.input-textarea:focus {
  outline: none;
}
.input-text:focus-visible,
.input-textarea:focus-visible {
  outline: 2px solid var(--accent-solid);
  outline-offset: 2px;
  border-color: var(--accent-solid);
}

.input-textarea {
  resize: vertical;
  min-height: 80px;
}

.btn {
  display: -webkit-inline-box;
  display: -ms-inline-flexbox;
  display: inline-flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  padding: 0.5em 1em;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  -webkit-transition: all var(--transition);
  transition: all var(--transition);
  backdrop-filter: blur(12px) saturate(1.4);
  -webkit-backdrop-filter: blur(12px) saturate(1.4);
}
.btn:focus-visible {
  outline: 2px solid var(--accent-solid);
  outline-offset: 2px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-from), var(--accent-to));
  color: #fff;
  border-color: transparent;
  -webkit-box-shadow: 0 4px 16px rgba(0, 119, 237, 0.3), 0 2px 8px rgba(0, 119, 237, 0.15);
          box-shadow: 0 4px 16px rgba(0, 119, 237, 0.3), 0 2px 8px rgba(0, 119, 237, 0.15);
}
.btn-primary:hover {
  -webkit-transform: translateY(-1px);
          transform: translateY(-1px);
  -webkit-box-shadow: 0 6px 20px rgba(0, 119, 237, 0.4), 0 2px 8px rgba(0, 119, 237, 0.2);
          box-shadow: 0 6px 20px rgba(0, 119, 237, 0.4), 0 2px 8px rgba(0, 119, 237, 0.2);
}
.btn-primary:active {
  -webkit-transform: translateY(0);
          transform: translateY(0);
}
.btn-primary.copied {
  background: rgba(52, 199, 89, 0.15);
  border-color: rgba(52, 199, 89, 0.4);
  color: var(--success);
  -webkit-box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.4), 0 2px 8px rgba(52, 199, 89, 0.15);
          box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.4), 0 2px 8px rgba(52, 199, 89, 0.15);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.2);
  color: var(--text-secondary);
  border: 1px solid rgba(50, 183, 216, 0.2);
  -webkit-box-shadow: inset 0 1.5px 1.5px rgba(255, 255, 255, 0.6), inset 0 -1px 1px rgba(0, 0, 0, 0.06), 0 4px 16px rgba(0, 0, 0, 0.08);
          box-shadow: inset 0 1.5px 1.5px rgba(255, 255, 255, 0.6), inset 0 -1px 1px rgba(0, 0, 0, 0.06), 0 4px 16px rgba(0, 0, 0, 0.08);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.32);
  color: var(--text-primary);
  -webkit-box-shadow: inset 0 1.5px 1.5px rgba(255, 255, 255, 0.7), inset 0 -1px 1px rgba(0, 0, 0, 0.06), 0 6px 20px rgba(0, 0, 0, 0.12);
          box-shadow: inset 0 1.5px 1.5px rgba(255, 255, 255, 0.7), inset 0 -1px 1px rgba(0, 0, 0, 0.06), 0 6px 20px rgba(0, 0, 0, 0.12);
  -webkit-transform: translateY(-1px);
          transform: translateY(-1px);
}
.btn-secondary:active {
  -webkit-transform: translateY(0);
          transform: translateY(0);
  -webkit-box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.06);
          box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.06);
}

.theme-toggle-btn {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  gap: 0.4em;
  padding: 0.4em 0.9em;
  background: rgba(255, 255, 255, 0.55);
  color: var(--text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  -webkit-box-shadow: 0 1.5px 0 rgba(255, 255, 255, 0.9) inset, 0 4px 12px rgba(0, 0, 0, 0.07);
          box-shadow: 0 1.5px 0 rgba(255, 255, 255, 0.9) inset, 0 4px 12px rgba(0, 0, 0, 0.07);
  -webkit-transition: all var(--transition);
  transition: all var(--transition);
}
.theme-toggle-btn:hover {
  background: rgba(255, 255, 255, 0.72);
  color: var(--text-primary);
  -webkit-transform: translateY(-1px);
          transform: translateY(-1px);
  -webkit-box-shadow: 0 1.5px 0 rgba(255, 255, 255, 0.9) inset, 0 6px 16px rgba(0, 0, 0, 0.1);
          box-shadow: 0 1.5px 0 rgba(255, 255, 255, 0.9) inset, 0 6px 16px rgba(0, 0, 0, 0.1);
}
.theme-toggle-btn:focus-visible {
  outline: 2px solid var(--accent-solid);
  outline-offset: 2px;
}
[data-theme=dark] .theme-toggle-btn {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.12);
  -webkit-box-shadow: 0 1.5px 0 rgba(255, 255, 255, 0.1) inset, 0 4px 12px rgba(0, 0, 0, 0.3);
          box-shadow: 0 1.5px 0 rgba(255, 255, 255, 0.1) inset, 0 4px 12px rgba(0, 0, 0, 0.3);
}
[data-theme=dark] .theme-toggle-btn:hover {
  background: rgba(255, 255, 255, 0.13);
}

.theme-toggle-icon {
  font-size: 1em;
  line-height: 1;
}

.theme-toggle-label {
  font-size: var(--font-size-xs);
}

[data-theme=dark] .btn {
  border-color: rgba(255, 255, 255, 0.1);
}
[data-theme=dark] .btn-secondary {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.12);
  -webkit-box-shadow: inset 0 1.5px 1.5px rgba(255, 255, 255, 0.1), inset 0 -1px 1px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.3);
          box-shadow: inset 0 1.5px 1.5px rgba(255, 255, 255, 0.1), inset 0 -1px 1px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.3);
}
[data-theme=dark] .btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  -webkit-box-shadow: inset 0 1.5px 1.5px rgba(255, 255, 255, 0.14), inset 0 -1px 1px rgba(0, 0, 0, 0.3), 0 6px 20px rgba(0, 0, 0, 0.4);
          box-shadow: inset 0 1.5px 1.5px rgba(255, 255, 255, 0.14), inset 0 -1px 1px rgba(0, 0, 0, 0.3), 0 6px 20px rgba(0, 0, 0, 0.4);
}
[data-theme=dark] .btn-secondary:active {
  -webkit-box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.4), 0 2px 8px rgba(0, 0, 0, 0.2);
          box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.4), 0 2px 8px rgba(0, 0, 0, 0.2);
}

.tab-list {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0;
}

.tab-btn {
  padding: 0.5em 1em;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  -webkit-transition: all var(--transition);
  transition: all var(--transition);
  margin-bottom: -1px;
}
.tab-btn:hover {
  color: var(--accent-solid);
}
.tab-btn.active {
  color: var(--accent-solid);
  border-bottom-color: var(--accent-solid);
}
.tab-btn[hidden] {
  display: none;
}

.preview-pre {
  background: var(--bg-code);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  overflow-x: auto;
  max-height: 70vh;
  overflow-y: auto;
  margin-bottom: var(--space-md);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  -webkit-box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.2), 0 4px 16px rgba(0, 0, 0, 0.1);
          box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.2), 0 4px 16px rgba(0, 0, 0, 0.1);
}

.preview-code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: var(--font-size-xs);
  line-height: 1.7;
  color: var(--text-code);
  white-space: pre-wrap;
  word-break: break-all;
  display: block;
  -moz-tab-size: 4;
    -o-tab-size: 4;
       tab-size: 4;
}

.preview-actions {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  gap: var(--space-sm);
}

.article {
  max-width: 45em;
  margin: 0 auto;
  padding-inline: clamp(1.5em, 5vw, 3em);
  font-size: var(--font-size-md);
  line-height: 1.8;
}
.article h2 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-primary);
  margin: 2em 0 0.6em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border-color);
}
.article h2:first-child {
  margin-top: 0;
}
.article h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin: 1.5em 0 0.4em;
}
.article h4 {
  font-size: var(--font-size-md);
  font-weight: 600;
  color: var(--text-secondary);
  margin: 1.2em 0 0.4em;
}
.article p {
  margin: 0.6em 0;
  color: var(--text-primary);
}
.article code {
  background: var(--bg-input);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.9em;
  color: #0059b3;
  border: 1px solid var(--border-color);
}
[data-theme=dark] .article code {
  color: #7cc4ff;
}
.article blockquote {
  margin: 1em 0;
  padding: 0.8em 1.2em;
  background: rgba(0, 119, 237, 0.06);
  border-left: 3px solid var(--accent-solid);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.article blockquote p {
  margin: 0.3em 0;
  color: var(--text-secondary);
}
[data-theme=dark] .article blockquote {
  background: rgba(77, 184, 255, 0.08);
}

.article-code {
  background: var(--bg-code);
  border-radius: var(--radius-md);
  padding: 1em 1.2em;
  margin: 0.8em 0;
  overflow-x: auto;
  border: 1px solid rgba(255, 255, 255, 0.08);
  -webkit-box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.2), 0 4px 16px rgba(0, 0, 0, 0.1);
          box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.2), 0 4px 16px rgba(0, 0, 0, 0.1);
}
.article-code code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text-code);
  font-size: var(--font-size-sm);
  line-height: 1.7;
  white-space: pre;
  display: block;
  -moz-tab-size: 4;
    -o-tab-size: 4;
       tab-size: 4;
}

.table-wrap {
  overflow-x: auto;
  margin: 0.8em 0;
}

.article table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}
.article table th,
.article table td {
  padding: 0.6em 0.8em;
  border: 1px solid var(--border-color);
  text-align: left;
}
.article table th {
  background: rgba(0, 119, 237, 0.08);
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}
[data-theme=dark] .article table th {
  background: rgba(77, 184, 255, 0.1);
}
.article table td {
  color: var(--text-primary);
}
.article table tbody tr:nth-child(even) {
  background: rgba(0, 90, 200, 0.03);
}
[data-theme=dark] .article table tbody tr:nth-child(even) {
  background: rgba(120, 180, 255, 0.04);
}

.article-back {
  margin-top: 2em;
  padding-top: 1.5em;
  border-top: 1px solid var(--border-color);
  text-align: center;
}