/* ========================================================================
   BASE64 & DEVELOPER TOOLS — DESIGN SYSTEM
   Target: RO / DACH / EN | Psychological: Trust + Clarity + Efficiency
   No gradients. Flat/solid colors only. CSS custom properties throughout.
   ======================================================================== */

/* 1. VARIABLES & THEME =================================================== */
:root {
  /* Colors — Light theme */
  --bg-page: #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-surface: #F1F5F9;
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --warm: #D97706;
  --success: #10B981;
  --error: #EF4444;
  --border: #E2E8F0;
  --shadow-sm: 0 1px 3px rgba(15,23,42,0.08);
  --shadow-md: 0 4px 12px rgba(15,23,42,0.12);
  --focus-ring: 0 0 0 3px rgba(37,99,235,0.25);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Layout */
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 4px;
  --max-width: 1200px;
  --header-height: 64px;

  /* Typography */
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", "SF Mono", "Consolas", monospace;
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.8125rem, 0.75rem + 0.3vw, 0.9375rem);
  --text-base: clamp(0.875rem, 0.8rem + 0.3vw, 1rem);
  --text-lg: clamp(1rem, 0.9rem + 0.4vw, 1.125rem);
  --text-xl: clamp(1.25rem, 1rem + 1vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.2rem + 1.2vw, 1.875rem);
  --text-3xl: clamp(1.875rem, 1.5rem + 1.5vw, 2.25rem);

  /* Motion */
  --ease: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --ease-slow: 0.25s cubic-bezier(0.4, 0, 0.2, 1);

  /* Tool-specific */
  --diff-added-bg: #D1FAE5;
  --diff-added-text: #065F46;
  --diff-removed-bg: #FEE2E2;
  --diff-removed-text: #991B1B;
  --diff-unchanged-bg: transparent;
  --regex-mark-bg: #FEF08A;
  --regex-mark-text: #713F12;
  --jwt-valid-bg: #D1FAE5;
  --jwt-valid-text: #065F46;
  --jwt-expired-bg: #FEE2E2;
  --jwt-expired-text: #991B1B;
  --jwt-noexp-bg: #FEF3C7;
  --jwt-noexp-text: #92400E;
}

/* Dark theme — OS preference */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-page: #0B1120;
    --bg-card: #111827;
    --bg-surface: #1E293B;
    --text-primary: #F1F5F9;
    --text-secondary: #CBD5E1;
    --text-muted: #64748B;
    --border: #334155;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --diff-added-bg: #064E3B;
    --diff-added-text: #6EE7B7;
    --diff-removed-bg: #7F1D1D;
    --diff-removed-text: #FCA5A5;
    --regex-mark-bg: #713F12;
    --regex-mark-text: #FEF08A;
    --jwt-valid-bg: #064E3B;
    --jwt-valid-text: #6EE7B7;
    --jwt-expired-bg: #7F1D1D;
    --jwt-expired-text: #FCA5A5;
    --jwt-noexp-bg: #78350F;
    --jwt-noexp-text: #FCD34D;
  }
}

/* Dark theme — manual override */
html.theme-dark {
  --bg-page: #0B1120;
  --bg-card: #111827;
  --bg-surface: #1E293B;
  --text-primary: #F1F5F9;
  --text-secondary: #CBD5E1;
  --text-muted: #64748B;
  --border: #334155;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --diff-added-bg: #064E3B;
  --diff-added-text: #6EE7B7;
  --diff-removed-bg: #7F1D1D;
  --diff-removed-text: #FCA5A5;
  --regex-mark-bg: #713F12;
  --regex-mark-text: #FEF08A;
  --jwt-valid-bg: #064E3B;
  --jwt-valid-text: #6EE7B7;
  --jwt-expired-bg: #7F1D1D;
  --jwt-expired-text: #FCA5A5;
  --jwt-noexp-bg: #78350F;
  --jwt-noexp-text: #FCD34D;
}

/* 2. BASE & RESET ======================================================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1, "liga" 1;
}
body {
  font-family: var(--font-sans);
  background: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  /* Prevent content from hiding behind fixed footer and donate button */
  padding-bottom: 80px;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font: inherit; }
ul, ol { list-style: none; }

/* 3. LAYOUT & CONTAINERS ================================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding-inline: var(--space-lg);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-height);
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Logo */
.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-primary);
  font-size: var(--text-lg);
  line-height: 1.2;
  transition: opacity var(--ease);
}
.logo:hover { opacity: 0.9; }
.logo-img {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  display: block;
  border-radius: var(--radius-sm);
}
.logo strong {
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* Sub-site Banner */
.subsite-banner {
  position: sticky;
  top: var(--header-height);
  z-index: 49;
  background: var(--accent);
  color: #fff;
  text-align: center;
  padding: 10px 16px;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.3px;
}
.subsite-banner a {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 700;
}

/* Main */
main { flex: 1; padding-block: var(--space-2xl); }

/* Legal Footer */
.subsite-legal-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 8px 16px;
  z-index: 9998;
  text-align: center;
  font-size: var(--text-sm);
}
.subsite-legal-footer a {
  color: var(--accent);
  font-weight: 600;
}
.subsite-legal-footer .legal-link {
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* 4. TYPOGRAPHY & UTILITIES ============================================= */
h1, h2, h3, h4 {
  text-wrap: balance;
  line-height: 1.2;
  font-weight: 600;
}
h1 { font-size: var(--text-2xl); margin-bottom: var(--space-sm); }
h2 { font-size: var(--text-xl); margin-bottom: var(--space-md); }
h3 { font-size: var(--text-lg); margin-bottom: var(--space-sm); }

.text-center { text-align: center; }
.text-muted  { color: var(--text-muted); }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* 5. COMPONENTS ========================================================= */

/* Language Switcher — Pill Design */
.lang-switch {
  display: inline-flex;
  background: var(--bg-surface);
  padding: 4px;
  border-radius: 999px;
  gap: 4px;
  align-items: center;
}
.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  transition: all 0.2s ease;
  white-space: nowrap;
  cursor: pointer;
}
.lang-btn:hover {
  color: var(--text-primary);
}
.lang-btn.active,
.lang-btn[aria-current="true"] {
  background: var(--bg-card);
  color: var(--accent);
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
}

/* Theme Toggle */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  transition: var(--ease);
}
.theme-toggle:hover {
  border-color: var(--accent);
}

/* Tool Card */
.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  max-width: 960px;
  margin: 0 auto;
}

/* Tool Subtitle */
.tool-subtitle {
  margin-bottom: var(--space-lg);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  border: 1px solid transparent;
  background: var(--accent);
  color: #fff;
  transition: var(--ease);
}
.btn:hover { background: var(--accent-hover); }
.btn--outline {
  background: transparent;
  border-color: var(--border);
  color: var(--text-primary);
}
.btn--outline:hover { background: var(--bg-surface); }
.btn-sm {
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--text-xs);
  margin-top: var(--space-xs);
}

/* Forms */
.form-group { margin-bottom: var(--space-md); }
.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  margin-bottom: var(--space-xs);
}
.form-input, .form-textarea {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: var(--text-base);
  font-family: var(--font-sans);
  transition: var(--ease);
}
.form-textarea {
  resize: vertical;
  min-height: 80px;
}
.form-input:focus, .form-textarea:focus {
  outline: none;
  box-shadow: var(--focus-ring);
  border-color: var(--accent);
}
.form-input.is-error, .form-textarea.is-error {
  border-color: var(--error);
  box-shadow: 0 0 0 3px rgba(239,68,68,0.2);
}

/* Monospace inputs */
.mono {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.6;
}

/* Tool Error */
.tool-error {
  color: var(--error);
  background: var(--diff-removed-bg);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  margin-top: var(--space-md);
  border-left: 3px solid var(--error);
}

/* 6. TOOL-SPECIFIC ====================================================== */

/* ── Tool Tabs ── */
.tool-tabs {
  display: flex;
  gap: var(--space-xs);
  border-bottom: 2px solid var(--border);
  margin-bottom: var(--space-xl);
  padding-bottom: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.tool-tab {
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition: color var(--ease), border-color var(--ease);
}
.tool-tab:hover {
  color: var(--accent);
}
.tool-tab.active,
.tool-tab[aria-selected="true"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

/* Tab Panels */
.tab-panel {
  display: none;
}
.tab-panel.active {
  display: block;
  animation: fadeIn 0.2s ease;
}

/* ── Tool Row (Base64, URL layout) ── */
.tool-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}
.tool-field {
  display: flex;
  flex-direction: column;
}
.tool-actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

/* ── JWT Sections ── */
.jwt-sections {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-md);
}
.jwt-part {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
}
.jwt-part-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
  flex-wrap: wrap;
}
.jwt-part-header h3 {
  margin: 0;
  font-size: var(--text-base);
}
.jwt-alg {
  font-size: var(--text-xs);
  background: var(--bg-card);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
  color: var(--text-muted);
  font-family: var(--font-mono);
}
.jwt-status {
  font-size: var(--text-xs);
  padding: 2px 10px;
  border-radius: 999px;
  font-weight: 600;
}
.jwt-status.valid {
  background: var(--jwt-valid-bg);
  color: var(--jwt-valid-text);
}
.jwt-status.expired {
  background: var(--jwt-expired-bg);
  color: var(--jwt-expired-text);
}
.jwt-status.no-exp {
  background: var(--jwt-noexp-bg);
  color: var(--jwt-noexp-text);
}
.jwt-json {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-all;
  margin: 0;
  color: var(--text-primary);
}
.jwt-claims {
  margin-top: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}
.claim-row {
  display: flex;
  gap: var(--space-sm);
  font-size: var(--text-xs);
  align-items: baseline;
}
.claim-key {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--accent);
  min-width: 40px;
}
.claim-val {
  color: var(--text-secondary);
}
.jwt-note {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: var(--space-xs);
  font-style: italic;
}

/* ── Regex Controls ── */
.regex-controls {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}
.regex-pattern-row {
  display: flex;
  gap: var(--space-md);
  align-items: flex-end;
}
.regex-pattern-field {
  flex: 1;
}
.regex-flags-group {
  flex-shrink: 0;
}
.flag-toggles {
  display: flex;
  gap: var(--space-xs);
}
.flag-toggle {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
}
.flag-toggle input {
  display: none;
}
.flag-toggle span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-card);
  transition: var(--ease);
}
.flag-toggle input:checked + span {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.flag-toggle span:hover {
  border-color: var(--accent);
}

/* Regex Results */
.regex-count {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-left: var(--space-sm);
}
.regex-highlight {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.8;
  white-space: pre-wrap;
  word-break: break-all;
  margin-top: var(--space-sm);
}
.regex-match-mark {
  background: var(--regex-mark-bg);
  color: var(--regex-mark-text);
  border-radius: 2px;
  padding: 1px 0;
}
.regex-no-match {
  color: var(--text-muted);
  font-style: italic;
}
.regex-groups {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-top: var(--space-md);
}
.match-group-row {
  font-size: var(--text-sm);
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  flex-wrap: wrap;
}
.match-label {
  font-weight: 600;
  color: var(--text-secondary);
}
.group-badge {
  font-size: var(--text-xs);
  background: var(--bg-surface);
  padding: 1px 6px;
  border-radius: var(--radius-xs);
  color: var(--accent);
  font-weight: 500;
}
.match-group-row code {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  background: var(--bg-surface);
  padding: 1px 6px;
  border-radius: var(--radius-xs);
}

/* ── Diff Inputs ── */
.diff-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

/* Diff Stats */
.diff-stats {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-md);
  margin-bottom: var(--space-sm);
}
.diff-stat {
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-xs);
}
.diff-stat.added {
  background: var(--diff-added-bg);
  color: var(--diff-added-text);
}
.diff-stat.removed {
  background: var(--diff-removed-bg);
  color: var(--diff-removed-text);
}

/* Diff Output Table */
.diff-output {
  margin-top: var(--space-md);
}
.diff-identical {
  color: var(--text-muted);
  font-style: italic;
  text-align: center;
  padding: var(--space-xl);
}
.diff-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.6;
}
.diff-table td {
  padding: 2px 8px;
  vertical-align: top;
}
.diff-line-num {
  width: 40px;
  text-align: right;
  color: var(--text-muted);
  border-right: 1px solid var(--border);
  user-select: none;
}
.diff-prefix {
  width: 20px;
  text-align: center;
  font-weight: 700;
  user-select: none;
}
.diff-text {
  white-space: pre-wrap;
  word-break: break-all;
}
.diff-label {
  width: auto;
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  white-space: nowrap;
  padding-left: var(--space-md);
}

/* Diff row types */
.diff-added {
  background: var(--diff-added-bg);
  color: var(--diff-added-text);
}
.diff-removed {
  background: var(--diff-removed-bg);
  color: var(--diff-removed-text);
}
.diff-unchanged {
  background: var(--diff-unchanged-bg);
  color: var(--text-primary);
}
.diff-unchanged .diff-label {
  color: var(--text-muted);
}

/* Shimmer for loading states */
.shimmer {
  background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.1) 50%, transparent 100%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-xs);
}
html.theme-dark .shimmer {
  background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.05) 50%, transparent 100%);
  background-size: 200% 100%;
}

/* 7. STICKY DONATE ====================================================== */
.sticky-donate-wrapper {
  position: fixed;
  bottom: 44px;
  right: 24px;
  z-index: 90;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--ease), transform var(--ease);
  pointer-events: none;
}
.sticky-donate-wrapper.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.sticky-donate-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: #FFDD00;  /* Flat yellow — NO gradient */
  color: #111;
  font-weight: 600;
  font-size: var(--text-sm);
  border-radius: 999px;
  box-shadow: var(--shadow-md);
  border: none;
  text-decoration: none;
  transition: transform var(--ease), box-shadow var(--ease);
}
.sticky-donate-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 14px rgba(255,221,0,0.3);
}
.sticky-donate-btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}
.donate-icon { font-size: 1.2em; }

/* 8. MODAL =============================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}
.modal-overlay.is-active {
  opacity: 1;
  visibility: visible;
}
.modal-container {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  max-width: 90vw;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
}
.modal-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
  z-index: 1;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 0.2s ease;
}
.modal-close:hover {
  background: var(--bg-surface);
  color: var(--text-primary);
}
.modal-content {
  padding: var(--space-2xl);
  overflow-y: auto;
  max-height: 80vh;
}
.modal-loading {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--text-muted);
}

/* 9. ANIMATIONS ========================================================== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes shimmer {
  to { background-position: -200% 0; }
}

/* 10. RESPONSIVE ========================================================= */
@media (max-width: 640px) {
  :root {
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
  }

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

  /* Header */
  .lang-btn span { display: none; }
  .lang-btn { padding: 6px 8px; font-size: 1.2rem; }

  /* Tabs — scrollable on mobile */
  .tool-tabs {
    gap: 0;
  }
  .tool-tab {
    padding: var(--space-sm);
    font-size: var(--text-xs);
  }

  /* Regex pattern row stacks */
  .regex-pattern-row {
    flex-direction: column;
    align-items: stretch;
  }

  /* Diff inputs stack */
  .diff-inputs {
    grid-template-columns: 1fr;
  }

  /* Diff label column hidden on mobile for space */
  .diff-label {
    display: none;
  }

  /* Sticky donate adjustments */
  .sticky-donate-wrapper {
    bottom: 36px;
    right: 16px;
  }
  .sticky-donate-btn {
    padding: 8px 14px;
    font-size: var(--text-xs);
  }

  /* Tool actions wrap */
  .tool-actions {
    flex-direction: column;
  }
  .tool-actions .btn {
    width: 100%;
  }
}

/* 11. REDUCED MOTION ==================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .sticky-donate-wrapper, .sticky-donate-btn {
    transition: none !important;
    animation: none !important;
  }
  .tab-panel.active {
    animation: none;
  }
}

/* 12. PRINT ============================================================== */
@media print {
  .site-header,
  .subsite-banner,
  .subsite-legal-footer,
  .sticky-donate-wrapper,
  .modal-overlay,
  .tool-tabs,
  .btn,
  .theme-toggle,
  .lang-switch { display: none; }
  body {
    background: #fff;
    color: #000;
    padding-bottom: 0;
  }
  .tool-card {
    box-shadow: none;
    border: 1px solid #000;
  }
  .tab-panel { display: block !important; }
  main { padding-block: 0; }
}