:root {
  --color-primary: #2e2d4d;   /* Deep indigo */
  --color-bg: #f7f6f9;        /* Soft off-white */
  --color-accent: #ffb86b;    /* Peach accent */
  --color-text: #232136;      /* Rich dark text */
  --color-border: #e0def4;    /* Light border */
  --color-danger: #ea4a5a;    /* Vibrant red */
  --color-q: #3e8ed0;         /* Blue for Q */
  --color-a: #2a273f;         /* Peach for A */
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #232136;
    --color-text: #e0def4;
    --color-border: #393552;
    --color-primary: #393552;
    --color-accent: #ffb86b;
    --color-q: #7aa2f7;
    --color-a: #ffb86b;
  }
}

html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  letter-spacing: 0.01em;
}

.container {
  max-width: 900px;
  padding: 32px 12px 24px 12px;
  margin: 0 auto;
  box-sizing: border-box;
  width: 100%;
  min-width: 0;
}

header {
  padding: 12px 0 20px;
  text-align: center;
}

.title {
  font-size: 2.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
  font-family: 'Inter', system-ui, sans-serif;
  color: var(--color-primary);
}

.subtitle {
  margin: 0;
  color: #6e6a86;
  font-size: 1.1rem;
  font-family: 'Inter', system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  .subtitle { color: #e0def4; }
}

.card {
  border: 1px solid var(--color-border);
  border-radius: 18px;
  padding: 22px 16px 18px 16px;
  background: #fff;
  box-shadow: 0 2px 16px 0 rgba(46,45,77,0.07);
  margin-bottom: 18px;
}
@media (prefers-color-scheme: dark) {
  .card { background: #2a273f; }
}

.grid {
  display: grid;
  gap: 14px;
}
@media (min-width: 720px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 719px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
  .actions {
    flex-direction: column;
    gap: 8px;
  }
}

.field {
  display: grid;
  gap: 6px;
  min-width: 0;
}

label {
  font-weight: 600;
  font-size: 1rem;
  font-family: 'Inter', system-ui, sans-serif;
}

.hint {
  font-size: 0.93rem;
  color: #6e6a86;
  font-family: 'Inter', system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  .hint { color: #e0def4; }
}

input[type="text"],
input[type="range"],
button,
textarea {
  width: 100%;
  font-family: 'Inter', system-ui, sans-serif;
  box-sizing: border-box;
  min-width: 0;
}

input[type="text"] {
  border: 1.5px solid var(--color-border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 1rem;
  background: var(--color-bg);
  color: var(--color-text);
  outline: none;
  transition: box-shadow 0.15s ease, border-color 0.15s ease;
  min-width: 0;
  width: 100%;
  box-sizing: border-box;
  overflow-x: auto;
  word-break: break-all;
}

input[type="text"]:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(46,45,77, 0.13);
}

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

.range-val {
  min-width: 2.25rem;
  text-align: center;
  font-weight: 600;
  color: var(--color-primary);
}

input[type="range"] {
  appearance: none;
  height: 6px;
  border-radius: 999px;
  background: var(--color-border);
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  height: 18px;
  width: 18px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  border: none;
  transition: transform 0.12s ease;
}
input[type="range"]::-webkit-slider-thumb:active { transform: scale(1.05); }

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 4px;
}

button {
  appearance: none;
  border: none;
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 600;
  cursor: pointer;
  color: #fff;
  background: var(--color-primary);
  transition: filter 0.15s ease, transform 0.05s ease;
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
button i { font-size: 1.1em; }
button:hover { filter: brightness(0.95); }
button:active { transform: translateY(1px); }

.btn-secondary {
  color: var(--color-primary);
  background: transparent;
  border: 1.5px solid var(--color-primary);
}

.btn-danger {
  background: var(--color-danger);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.98rem;
  min-height: 24px;
}

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(0,0,0,0.1);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@media (prefers-color-scheme: dark) {
  .spinner { border: 2px solid rgba(255,255,255,0.2); }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

.error {
  color: var(--color-danger);
  font-weight: 600;
}

/* Output */
.output-wrap {
  margin-top: 16px;
  display: grid;
  gap: 10px;
}

.output-area {
  border: 1.5px solid var(--color-border);
  border-radius: 14px;
  padding: 16px 14px;
  background: #f3f0fa;
  color: var(--color-text);
  font-family: 'Fira Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  white-space: pre-wrap;
  min-height: 220px;
  overflow: auto;
  font-size: 1.04rem;
  line-height: 1.7;
  word-break: break-word;
}
@media (prefers-color-scheme: dark) {
  .output-area { background: #232136; }
}

footer {
  margin-top: 20px;
  font-size: 0.95rem;
  color: #6e6a86;
  font-family: 'Inter', system-ui, sans-serif;
  text-align: center;
}
@media (prefers-color-scheme: dark) {
  footer { color: #e0def4; }
}

/* Utility */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  border: 0; white-space: nowrap;
}
.qa-q {
  color: var(--color-q);
  font-weight: 700;
  letter-spacing: 0.01em;
}
.qa-a {
  color: var(--color-a);
  font-weight: 600;
  letter-spacing: 0.01em;
}
.download-btn {
  margin-top: 10px;
  width: auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 1rem;
}

/* Responsive tweaks */
@media (max-width: 600px) {
  .container {
    padding: 10px 2vw 18px 2vw;
    width: 100vw;
    min-width: 0;
    max-width: 100vw;
    box-sizing: border-box;
    overflow-x: hidden;
  }
  .card {
    padding: 14px 6px 12px 6px;
    border-radius: 12px;
  }
  .output-area {
    font-size: 0.98rem;
    padding: 10px 6px;
    border-radius: 8px;
  }
  .title {
    font-size: 1.3rem;
  }
  .subtitle {
    font-size: 1rem;
  }
  input[type="text"] {
    font-size: 0.98rem;
    padding: 10px 6px;
    min-width: 0;
    width: 100%;
    box-sizing: border-box;
    overflow-x: auto;
    word-break: break-all;
  }
  .field {
    min-width: 0;
  }
  .grid-2 {
    min-width: 0;
  }
}

/* Prevent input overflow on all screens */
input[type="text"] {
  min-width: 0;
  width: 100%;
  box-sizing: border-box;
  overflow-x: auto;
  word-break: break-all;
}