:root {
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Inter",
    "SF Pro Text", "Segoe UI", sans-serif;

  /* Default (dark, but fresh) palette as fallback */
  --bg: #020617;
  --bg-elevated: rgba(15, 23, 42, 0.9);
  --bg-subtle: rgba(30, 64, 175, 0.08);
  --border-subtle: rgba(148, 163, 184, 0.25);
  --border-strong: rgba(148, 163, 184, 0.5);
  --text: #e5e7eb;
  --text-dim: #94a3b8;
  --accent: #22c55e;
  --accent-soft: rgba(34, 197, 94, 0.18);
  --accent-strong: rgba(34, 197, 94, 0.45);
  --danger: #fb7185;
  --shadow-soft: 0 18px 50px rgba(15, 23, 42, 0.6);
  --radius-lg: 18px;
  --radius-full: 999px;
  --backdrop-blur: 24px;

  --preview-bg: radial-gradient(
      circle at 0% 0%,
      rgba(45, 212, 191, 0.18),
      transparent 55%
    ),
    radial-gradient(
      circle at 100% 100%,
      rgba(59, 130, 246, 0.18),
      transparent 55%
    ),
    linear-gradient(145deg, #020617, #0b1220);

  --transition-fast: 140ms ease-out;
  --transition-medium: 220ms ease;

  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background: radial-gradient(
      circle at 0% 0%,
      rgba(45, 212, 191, 0.18),
      transparent 55%
    ),
    radial-gradient(
      circle at 100% 0%,
      rgba(56, 189, 248, 0.16),
      transparent 55%
    ),
    radial-gradient(
      circle at 0% 100%,
      rgba(129, 140, 248, 0.18),
      transparent 60%
    ),
    #020617;
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.app-shell {
  min-height: 100vh;
  max-width: 1240px;
  margin: 0 auto;
  padding: 20px 16px 32px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.glass-surface {
  background: linear-gradient(
      135deg,
      rgba(15, 23, 42, 0.85),
      rgba(15, 23, 42, 0.78)
    );
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(var(--backdrop-blur));
  -webkit-backdrop-filter: blur(var(--backdrop-blur));
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  gap: 16px;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  width: 32px;
  height: 32px;
}

.logo-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.logo-title {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.logo-subtitle {
  font-size: 11px;
  color: var(--text-dim);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.lang-indicator {
  display: inline-flex;
  align-items: center;
}

.lang-chip {
  border-radius: var(--radius-full);
  border: 1px solid rgba(148, 163, 184, 0.45);
  padding: 3px 9px;
  font-size: 10px;
  color: var(--text-dim);
  background: rgba(15, 23, 42, 0.96);
}

.theme-toggle {
  display: inline-flex;
  padding: 3px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.35);
  box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.9);
}

.theme-chip {
  border: none;
  background: transparent;
  color: var(--text-dim);
  padding: 4px 10px;
  font-size: 11px;
  border-radius: 999px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  transition: background var(--transition-fast), color var(--transition-fast),
    transform var(--transition-fast);
}

.theme-chip:hover {
  color: var(--text);
  transform: translateY(-0.5px);
}

.theme-chip.is-active {
  background: radial-gradient(
      circle at 0% 0%,
      rgba(56, 189, 248, 0.4),
      transparent 60%
    ),
    rgba(15, 23, 42, 1);
  color: #e0f2fe;
}

.pill-link {
  border-radius: var(--radius-full);
  padding: 8px 14px;
  border: 1px solid rgba(148, 163, 184, 0.45);
  background: radial-gradient(
      circle at 0 0,
      rgba(56, 189, 248, 0.3),
      transparent 60%
    );
  color: var(--text);
  font-size: 11px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  transition: background var(--transition-medium), transform 160ms ease,
    box-shadow var(--transition-medium), border-color var(--transition-medium);
}

.pill-link:hover {
  transform: translateY(-1px) translateZ(0);
  border-color: rgba(248, 250, 252, 0.65);
  box-shadow: 0 16px 45px rgba(15, 23, 42, 0.9);
}

.app-main {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1.1fr);
  gap: 18px;
  align-items: flex-start;
}

.panel {
  padding: 16px 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 420px;
}

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.panel-title {
  margin: 0 0 4px;
  font-size: 18px;
  letter-spacing: 0.02em;
}

.en-sub {
  display: block;
  margin-top: 2px;
  font-size: 11px;
  color: var(--text-dim);
}

.en-sub-inline {
  font-size: 10px;
  color: var(--text-dim);
  margin-left: 4px;
}

.panel-description {
  margin: 0;
  color: var(--text-dim);
  font-size: 12px;
}

.badge-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.badge {
  border-radius: 999px;
  padding: 3px 9px;
  font-size: 10px;
  border: 1px solid rgba(148, 163, 184, 0.3);
  background: rgba(15, 23, 42, 0.9);
  color: var(--text-dim);
}

.section-block {
  border-radius: 14px;
  border: 1px solid rgba(148, 163, 184, 0.2);
  background: linear-gradient(
    145deg,
    rgba(15, 23, 42, 0.9),
    rgba(15, 23, 42, 0.8)
  );
  padding: 12px 12px 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.section-header {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.section-title {
  margin: 0;
  font-size: 14px;
}

.section-caption {
  margin: 0;
  font-size: 11px;
  color: var(--text-dim);
}

.style-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.style-card {
  position: relative;
  text-align: left;
  border-radius: 14px;
  border: 1px solid rgba(148, 163, 184, 0.35);
  background: radial-gradient(
      circle at 0% 0%,
      rgba(56, 189, 248, 0.25),
      transparent 60%
    ),
    rgba(15, 23, 42, 0.9);
  padding: 10px 10px 10px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  transition: transform 150ms ease, box-shadow 150ms ease,
    border-color var(--transition-fast), background var(--transition-medium),
    opacity 140ms ease;
}

.style-card::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0;
  border-radius: inherit;
  border: 1px solid rgba(248, 250, 252, 0.45);
  pointer-events: none;
  transition: opacity 140ms ease;
}

.style-card .style-label {
  font-size: 13px;
  font-weight: 500;
}

.style-card .style-chip {
  font-size: 10px;
  color: rgba(191, 219, 254, 0.85);
  padding: 2px 7px;
  border-radius: 999px;
  border: 1px solid rgba(59, 130, 246, 0.7);
  background: linear-gradient(
    135deg,
    rgba(30, 64, 175, 0.7),
    rgba(37, 99, 235, 0.6)
  );
}

.style-card .style-desc {
  margin: 2px 0 0;
  font-size: 11px;
  color: var(--text-dim);
}

.style-card:hover {
  transform: translateY(-1.5px);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.9);
}

.style-card.is-active {
  border-color: rgba(96, 165, 250, 0.9);
  background: radial-gradient(
      circle at 0% 0%,
      rgba(56, 189, 248, 0.36),
      transparent 60%
    ),
    radial-gradient(
      circle at 100% 100%,
      rgba(96, 165, 250, 0.35),
      transparent 60%
    ),
    rgba(15, 23, 42, 1);
}

.style-card.is-active::after {
  opacity: 0.7;
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-label {
  font-size: 12px;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.field-hint {
  font-size: 10px;
  color: var(--text-dim);
}

.text-input,
.textarea {
  border-radius: 11px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: rgba(15, 23, 42, 0.94);
  padding: 7px 9px;
  font-size: 12px;
  color: var(--text);
  outline: none;
  resize: vertical;
  min-height: 32px;
  transition: border-color 130ms ease, box-shadow 130ms ease,
    background 130ms ease, transform 100ms ease;
}

.text-input::placeholder,
.textarea::placeholder {
  color: rgba(148, 163, 184, 0.6);
}

.text-input:focus,
.textarea:focus {
  border-color: rgba(96, 165, 250, 0.95);
  box-shadow: 0 0 0 1px rgba(96, 165, 250, 0.8);
  background: rgba(15, 23, 42, 1);
  transform: translateY(-0.5px);
}

.field-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.advanced-toggle {
  margin: 0;
  border-radius: 11px;
  border: 1px dashed rgba(148, 163, 184, 0.5);
  background: rgba(15, 23, 42, 0.9);
  padding: 6px 8px 8px;
}

.advanced-toggle summary {
  list-style: none;
  cursor: pointer;
  font-size: 11px;
  color: var(--text-dim);
}

.advanced-toggle summary::marker,
.advanced-toggle summary::-webkit-details-marker {
  display: none;
}

.advanced-toggle[open] summary {
  margin-bottom: 8px;
}

.advanced-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
}

.preview-header {
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.25);
}

.preview-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 6px 13px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.02em;
  cursor: pointer;
  background: transparent;
  color: var(--text);
  transition: transform 140ms ease, box-shadow 160ms ease,
    background var(--transition-medium), border-color var(--transition-medium),
    color var(--transition-medium);
}

.btn.primary {
  background: linear-gradient(
      135deg,
      rgba(59, 130, 246, 0.15),
      rgba(56, 189, 248, 0.4)
    ),
    rgba(15, 23, 42, 0.96);
  border-color: rgba(129, 140, 248, 0.85);
  box-shadow: 0 18px 45px rgba(37, 99, 235, 0.6);
}

.btn.primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 22px 55px rgba(37, 99, 235, 0.75);
}

.btn.ghost {
  border-color: rgba(148, 163, 184, 0.7);
  background: rgba(15, 23, 42, 0.95);
  color: var(--text-dim);
}

.btn.ghost:hover {
  color: var(--text);
  border-color: rgba(248, 250, 252, 0.6);
  transform: translateY(-1px);
}

.preview-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
}

.pill {
  border-radius: 999px;
  padding: 3px 9px;
  font-size: 10px;
}

.pill-soft {
  background: radial-gradient(
      circle at 0 0,
      rgba(56, 189, 248, 0.3),
      transparent 60%
    );
  border: 1px solid rgba(96, 165, 250, 0.9);
  color: #e0f2fe;
}

.pill-ghost {
  background: rgba(15, 23, 42, 0.98);
  border: 1px solid rgba(148, 163, 184, 0.7);
  color: var(--text-dim);
}

.preview-container {
  margin-top: 10px;
  border-radius: 14px;
  border: 1px solid rgba(148, 163, 184, 0.3);
  background: var(--preview-bg);
  padding: 12px 12px;
  flex: 1;
  position: relative;
  overflow: hidden;
}

.preview-container::before {
  content: "";
  position: absolute;
  inset: -40%;
  opacity: 0.7;
  background: radial-gradient(
      circle at 0 0,
      rgba(56, 189, 248, 0.18),
      transparent 45%
    ),
    radial-gradient(
      circle at 100% 0,
      rgba(129, 140, 248, 0.19),
      transparent 45%
    ),
    radial-gradient(
      circle at 0 100%,
      rgba(16, 185, 129, 0.18),
      transparent 47%
    );
  mix-blend-mode: screen;
  pointer-events: none;
}

.preview-code-block {
  position: relative;
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 11px;
  line-height: 1.6;
  color: rgba(226, 232, 240, 0.96);
  white-space: pre-wrap;
  word-wrap: break-word;
  max-height: 420px;
  overflow: auto;
}

.preview-footer {
  padding-top: 8px;
}

.hint {
  margin: 0;
  font-size: 11px;
  color: var(--text-dim);
}

.support-section {
  margin-top: 4px;
  padding: 14px 16px 14px;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 14px;
}

.support-main {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.support-title {
  margin: 0;
  font-size: 15px;
}

.support-description {
  margin: 0;
  font-size: 11px;
  color: var(--text-dim);
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 6px;
}

.support-card {
  border-radius: 13px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: radial-gradient(
      circle at 0 0,
      rgba(56, 189, 248, 0.24),
      transparent 55%
    ),
    rgba(15, 23, 42, 0.98);
  padding: 9px 9px 10px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.support-card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px;
}

.support-asset {
  font-size: 12px;
  font-weight: 600;
}

.support-network {
  font-size: 10px;
  color: var(--text-dim);
}

.support-address {
  margin: 0;
  font-size: 10px;
  color: var(--text-dim);
}

.support-address span {
  display: block;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  margin-top: 1px;
  color: rgba(226, 232, 240, 0.96);
  word-wrap: break-word;
}

.support-qr {
  margin-top: 4px;
  border-radius: 11px;
  border: 1px dashed rgba(148, 163, 184, 0.5);
  background: rgba(15, 23, 42, 0.9);
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.support-qr img {
  width: 72px;
  height: 72px;
  object-fit: contain;
}

.support-preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.support-preview-image {
  width: 100%;
  max-width: 260px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: radial-gradient(
      circle at 0 0,
      rgba(56, 189, 248, 0.32),
      transparent 60%
    ),
    rgba(15, 23, 42, 0.96);
  padding: 4px;
}

.support-preview-caption {
  margin: 0;
  font-size: 10px;
  color: var(--text-dim);
}

.app-footer {
  margin-top: 4px;
  text-align: center;
  font-size: 11px;
  color: var(--text-dim);
}

.footer-dot {
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.8);
  margin: 0 4px;
}

/* Neon theme (applied via [data-theme="neon"]) */
[data-theme="neon"] {
  --bg: #020617;
  --bg-elevated: rgba(2, 6, 23, 0.98);
  --bg-subtle: rgba(15, 23, 42, 0.95);
  --border-subtle: rgba(59, 130, 246, 0.6);
  --border-strong: rgba(129, 140, 248, 0.9);
  --text: #e5e7eb;
  --text-dim: #9ca3af;
  --accent: #22d3ee;
  --accent-soft: rgba(56, 189, 248, 0.4);
  --accent-strong: rgba(56, 189, 248, 0.7);
  --preview-bg: radial-gradient(
      circle at 0 0,
      rgba(56, 189, 248, 0.8),
      transparent 55%
    ),
    radial-gradient(
      circle at 100% 100%,
      rgba(244, 63, 94, 0.8),
      transparent 55%
    ),
    radial-gradient(
      circle at 0% 100%,
      rgba(129, 140, 248, 0.9),
      transparent 55%
    ),
    #020617;
}

/* Retro theme (applied via [data-theme="retro"]) */
[data-theme="retro"] {
  --bg: #0b1020;
  --bg-elevated: #111827;
  --bg-subtle: #020617;
  --border-subtle: rgba(248, 250, 252, 0.12);
  --border-strong: rgba(248, 250, 252, 0.38);
  --text: #e5e7eb;
  --text-dim: #9ca3af;
  --accent: #facc15;
  --accent-soft: rgba(250, 204, 21, 0.22);
  --accent-strong: rgba(250, 204, 21, 0.6);
  --preview-bg: linear-gradient(135deg, #0f172a, #111827);
}

[data-theme="retro"] body {
  background: radial-gradient(
      circle at 0% 0%,
      rgba(250, 204, 21, 0.24),
      transparent 55%
    ),
    radial-gradient(
      circle at 100% 0%,
      rgba(249, 115, 22, 0.22),
      transparent 55%
    ),
    #0b1020;
}

/* Responsive */
@media (max-width: 960px) {
  .app-main {
    grid-template-columns: minmax(0, 1fr);
  }

  .panel {
    min-height: auto;
  }

  .preview-code-block {
    max-height: 320px;
  }

  .support-section {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 720px) {
  .app-shell {
    padding: 14px 10px 22px;
  }

  .app-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
  }

  .field-columns {
    grid-template-columns: minmax(0, 1fr);
  }

  .style-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .support-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .preview-actions {
    flex-wrap: wrap;
    justify-content: flex-end;
  }
}