:root {
  color-scheme: light;
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --background: #f4f6fb;
  --foreground: #0f172a;
  --card-bg: #ffffff;
  --border: #d6dae6;
  --primary: #3b82f6;
  --primary-hover: #1d4ed8;
  --muted: #475569;
  --focus-ring: rgba(59, 130, 246, 0.45);
}

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

body {
  margin: 0;
  background-color: #ffffff;
  color: var(--foreground);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
}


.app-main {
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: clamp(0.75rem, 1vw + 0.5rem, 1.5rem);
}

.card {
  background-color: var(--card-bg);
  border-radius: 18px;
  padding: clamp(1rem, 1vw + 1rem, 1.5rem);
  border: 1px solid var(--border);
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
}

.card h2 {
  margin-top: 0;
  font-size: 1.4rem;
}

.intro {
  margin: 0 0 1.5rem;
  color: var(--muted);
}

form {
  display: grid;
  gap: 1.2rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.form-group {
  display: grid;
  gap: 0.45rem;
}

label {
  font-weight: 600;
}

.required {
  color: #dc2626;
  margin-left: 0.2rem;
}

input:not([type="radio"]):not([type="checkbox"]),
textarea,
select {
  font: inherit;
  padding: 0.75rem 0.9rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background-color: rgba(255, 255, 255, 0.08);
  color: var(--foreground);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:not([type="radio"]):not([type="checkbox"]),
textarea,
select {
  background-color: #fff;
}

input:not([type="radio"]):not([type="checkbox"]):focus-visible,
textarea:focus-visible,
select:focus-visible,
button:focus-visible {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

input[type="range"] {
  width: 100%;
  padding: 0;
  background: none;
}

.range-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--muted);
}

.radio-group {
  display: grid;
  gap: 0.4rem;
}

#lengthFieldset {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  margin: 0;
}

#lengthFieldset legend {
  font-weight: 600;
  padding: 0;
}

.radio-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
}

.radio-option input[type="radio"] {
  width: 1.05rem;
  height: 1.05rem;
  accent-color: var(--primary);
}

.help-text {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.button-group {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.difficulty-btn {
  flex: 1;
  min-width: 100px;
  font: inherit;
  padding: 0.75rem 1rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background-color: #fff;
  color: var(--foreground);
  cursor: pointer;
  transition: all 0.2s ease;
  font-weight: 500;
}

.difficulty-btn:hover {
  border-color: var(--primary);
  background-color: rgba(59, 130, 246, 0.05);
}

.difficulty-btn:focus-visible {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.difficulty-btn.selected {
  background-color: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.difficulty-btn.selected:hover {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
}

button[type="submit"] {
  border: none;
  background-color: var(--primary);
  color: #fff;
  padding: 0.75rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 20px;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

button[type="submit"]:hover {
  background-color: var(--primary-hover);
}

button[type="submit"]:disabled {
  cursor: not-allowed;
  background-color: var(--muted);
}

.status {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 1.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.spinner {
  width: 1rem;
  height: 1rem;
  border: 2px solid transparent;
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  display: none;
}

.spinner.active {
  display: inline-block;
}

.status-text[data-type="error"] {
  color: #dc2626;
}

.status-text[data-type="success"] {
  color: #16a34a;
}

.results {
  display: grid;
  gap: 1rem;
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  flex-wrap: wrap;
}

.results-header > div {
  flex: 1;
  min-width: 200px;
}

.results-header .intro {
  margin-bottom: 0;
}

.pdf-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: none;
  background-color: #16a34a;
  color: #fff;
  padding: 0.75rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.2s ease;
  font-size: 0.95rem;
  white-space: nowrap;
}

.pdf-btn:hover {
  background-color: #15803d;
}

.pdf-btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(22, 163, 74, 0.45);
}

.pdf-btn svg {
  flex-shrink: 0;
}

.result-block {
  display: grid;
  gap: 0.75rem;
  border: 1px dashed var(--border);
  border-radius: 12px;
  padding: 0.75rem 1rem;
  background-color: rgba(148, 163, 184, 0.08);
}

.result-header {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 0.75rem;
}

.result-content {
  margin: 0;
  line-height: 1.6;
  white-space: normal;
  word-break: break-word;
  border: 1px dashed transparent;
  padding: 0.35rem;
}

.result-content[contenteditable="true"] {
  border-color: #d6dae6;
  border-radius: 10px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.result-content[contenteditable="true"]:focus-visible {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.pdf-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.pdf-control {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 140px;
}

.pdf-control label {
  font-weight: 600;
}

.pdf-control input[type="number"] {
  width: 100%;
  max-width: 120px;
}

.checkbox {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 600;
  user-select: none;
}

.noscript-message {
  text-align: center;
  background-color: #fee2e2;
  color: #991b1b;
  padding: 1rem;
  margin: 1rem;
  border-radius: 12px;
}

.honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.field-error {
  border-color: #dc2626 !important;
  box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.2);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 720px) {
  .card {
    padding: 1rem;
  }
}