:root {
  color-scheme: light dark;
  --bg: #f2f6fb;
  --bg-strong: #e7eef8;
  --surface: #ffffff;
  --surface-strong: #eff4fb;
  --text: #101b2b;
  --muted: #536074;
  --accent: #2a6fd6;
  --accent-strong: #1b4f9a;
  --border: #d7e1ef;
  --shadow: 0 30px 70px rgba(9, 18, 33, 0.12);
  --chip: #e7effb;
  --focus: rgba(42, 111, 214, 0.25);
  --grid: rgba(12, 18, 35, 0.05);
  --action-primary-bg: linear-gradient(135deg, #3a86ff, #2a6fd6);
  --action-primary-text: #f5f8ff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b111a;
    --bg-strong: #0f1724;
    --surface: #141e2c;
    --surface-strong: #1a2536;
    --text: #e6edf7;
    --muted: #9fb0c7;
    --accent: #61a8ff;
    --accent-strong: #2f6bd1;
    --border: #233049;
    --shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
    --chip: #1b263a;
    --focus: rgba(97, 168, 255, 0.25);
    --grid: rgba(255, 255, 255, 0.05);
    --action-primary-bg: linear-gradient(135deg, #6cb2ff, #3a7de0);
    --action-primary-text: #071018;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(900px 520px at 8% 6%, rgba(66, 149, 255, 0.25), transparent 60%),
    radial-gradient(700px 520px at 92% 12%, rgba(28, 78, 160, 0.2), transparent 60%),
    linear-gradient(160deg, var(--bg), var(--bg-strong));
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 48px 20px 64px;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
  opacity: 0.35;
  z-index: 0;
}

.bg-glow {
  position: fixed;
  inset: -35% auto auto -10%;
  width: 560px;
  height: 560px;
  background: radial-gradient(circle at center, rgba(58, 134, 255, 0.3), transparent 70%);
  filter: blur(20px);
  opacity: 0.8;
  pointer-events: none;
  animation: drift 18s ease-in-out infinite;
  z-index: 0;
}

@media (prefers-color-scheme: light) {
  .bg-glow {
    background: radial-gradient(circle at center, rgba(42, 111, 214, 0.28), transparent 70%);
  }
}

@keyframes drift {
  0% {
    transform: translate3d(0, 0, 0);
  }
  50% {
    transform: translate3d(40px, 20px, 0);
  }
  100% {
    transform: translate3d(0, 0, 0);
  }
}

.shell {
  width: min(960px, 100%);
  display: grid;
  gap: 24px;
  position: relative;
  z-index: 1;
}

.brand {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
}

.brand-copy {
  max-width: 680px;
}

.brand-eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 12px;
  color: var(--muted);
  margin: 0 0 12px;
}

h1 {
  margin: 0 0 10px;
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 600;
}

.brand-subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}

.brand-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.repo-link {
  appearance: none;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.repo-link:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  color: var(--accent);
}

.reset-button {
  background: var(--surface-strong);
}

.tabs {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  background: var(--surface);
  padding: 6px;
  border-radius: 18px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.tab {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--muted);
  padding: 12px 16px;
  border-radius: 14px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab.is-active {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #ffffff;
  box-shadow: 0 10px 24px rgba(31, 111, 139, 0.35);
}

.panel {
  display: none;
  flex-direction: column;
  gap: 18px;
  animation: fadeUp 0.35s ease;
}

.panel.is-active {
  display: flex;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.output {
  display: grid;
  gap: 14px;
  padding: 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  min-width: 0;
}

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

.output-title {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 12px;
  color: var(--muted);
  font-weight: 600;
}

.output-value {
  font-family: "JetBrains Mono", "SFMono-Regular", monospace;
  font-size: clamp(18px, 2.6vw, 24px);
  word-break: break-all;
  overflow-wrap: anywhere;
  padding: 8px 0;
  cursor: pointer;
  text-align: center;
}

.output-value:empty::before {
  content: attr(data-placeholder);
  color: var(--muted);
}

.output-value.is-compact {
  font-size: clamp(16px, 2.2vw, 22px);
  letter-spacing: -0.01em;
}

.output-value.is-extra-compact {
  font-size: clamp(15px, 2.1vw, 20px);
  letter-spacing: -0.015em;
}

.output-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 18px;
  font-size: 13px;
  color: var(--muted);
  border-top: 1px solid var(--border);
  padding-top: 12px;
  min-width: 0;
}

.output-meta span {
  min-width: 0;
  word-break: break-all;
  overflow-wrap: anywhere;
}

.strength {
  font-weight: 600;
}

.strength--very-weak {
  color: #f15b5b;
}

.strength--weak {
  color: #f48c42;
}

.strength--fair {
  color: #d7b23f;
}

.strength--strong {
  color: #45b880;
}

.strength--very-strong {
  color: #4fa0ff;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.action-button {
  appearance: none;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  padding: 12px 18px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.action-button.primary {
  background: var(--action-primary-bg, #ffffff);
  color: var(--action-primary-text, #0c121a);
  border-color: transparent;
  box-shadow: 0 14px 28px rgba(9, 18, 33, 0.25);
}

.action-button.secondary {
  background: transparent;
}

.action-button:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  box-shadow: 0 12px 24px rgba(42, 111, 214, 0.2);
}

.action-button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  box-shadow: none;
  transform: none;
}

.action-button svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.btn-icon {
  display: inline-flex;
}

.status {
  min-height: 18px;
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

.ghost-button {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface-strong);
  color: var(--text);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.ghost-button:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  color: var(--accent);
}

.ghost-button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
  transform: none;
}

.mono {
  font-family: "JetBrains Mono", "SFMono-Regular", monospace;
  font-weight: 600;
  word-break: break-all;
  overflow-wrap: anywhere;
}

.utm-highlight {
  color: var(--accent);
  font-weight: 600;
  background: rgba(58, 134, 255, 0.16);
  padding: 0 2px;
  border-radius: 6px;
}

@media (prefers-color-scheme: dark) {
  .utm-highlight {
    background: rgba(97, 168, 255, 0.18);
  }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 20px;
  display: grid;
  gap: 16px;
  box-shadow: var(--shadow);
}

.card h2 {
  margin: 0;
  font-size: 18px;
}

.preset-block {
  display: grid;
  gap: 10px;
}

.preset-label {
  font-weight: 600;
  font-size: 14px;
}

.preset-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.preset-button {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface-strong);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.preset-button:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  color: var(--accent);
}

.preset-button.is-active {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 10px 24px rgba(31, 111, 139, 0.25);
}

.preset-button:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.field {
  display: grid;
  gap: 6px;
}

.field span {
  font-weight: 500;
}

.length-inputs {
  display: grid;
  gap: 10px;
}

input[type="number"],
input[type="text"],
input[type="url"],
select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface-strong);
  color: var(--text);
  font-size: 15px;
}

input[type="range"].range-input {
  width: 100%;
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(
    90deg,
    var(--accent) 0%,
    var(--accent) var(--range-progress, 50%),
    var(--border) var(--range-progress, 50%),
    var(--border) 100%
  );
  accent-color: var(--accent);
  appearance: none;
}

input[type="range"].range-input:focus {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

input[type="range"].range-input::-webkit-slider-thumb {
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--accent);
  box-shadow: 0 6px 14px rgba(10, 20, 35, 0.2);
  cursor: pointer;
}

input[type="range"].range-input::-webkit-slider-runnable-track {
  height: 8px;
  border-radius: 999px;
}

input[type="range"].range-input::-moz-range-track {
  height: 8px;
  border-radius: 999px;
  background: var(--border);
}

input[type="range"].range-input::-moz-range-progress {
  height: 8px;
  border-radius: 999px;
  background: var(--accent);
}

input[type="range"].range-input::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--accent);
  box-shadow: 0 6px 14px rgba(10, 20, 35, 0.2);
  cursor: pointer;
}

input[type="number"]:focus,
input[type="text"]:focus,
input[type="url"]:focus,
select:focus,
button:focus {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

small {
  color: var(--muted);
  font-size: 12px;
}

.checks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 12px 16px;
}

.checks label {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--chip);
  padding: 8px 12px;
  border-radius: 999px;
}

input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}

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

.toggle-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  align-items: center;
}

.output-value::selection {
  background: var(--accent);
  color: #ffffff;
}

@media (max-width: 720px) {
  body {
    padding: 32px 16px 48px;
  }

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

  .brand-actions {
    width: 100%;
  }

  .repo-link {
    width: 100%;
    text-align: center;
  }

  .output {
    padding: 18px;
  }

  .action-row {
    justify-content: stretch;
  }

  .action-button {
    flex: 1 1 160px;
    justify-content: center;
  }
}