*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f5f3ef;
  --surface: #edeae4;
  --border: #d6d2ca;
  --text: #1a1a18;
  --muted: #8a8680;
  --success: #2e7d4f;
  --font: 'Segoe UI', system-ui, sans-serif;
  --mono: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 3rem 1.25rem 5rem;
}

header {
  margin-bottom: 3rem;
  text-align: center;
}

header h1 {
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text);
}

.container {
  width: 100%;
  max-width: 640px;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* Section label */
.section-label {
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

/* Tabs */
.tabs-wrap {
  display: flex;
  justify-content: center;
}

.tabs {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.tab {
  padding: 0.35rem 0.85rem;
  border-radius: 4px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.82rem;
  font-family: var(--font);
  transition: color 0.1s, border-color 0.1s;
}

.tab:hover { color: var(--text); }
.tab.active { color: var(--text); border-color: var(--border); }

/* Slider */
.slider-row {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.slider-row input[type=range] {
  flex: 1;
  accent-color: var(--text);
  cursor: pointer;
  height: 2px;
}

.slider-val {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  min-width: 28px;
  text-align: right;
  font-family: var(--mono);
}

/* Presets */
.presets {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.preset-btn {
  padding: 0.25rem 0.65rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.75rem;
  font-family: var(--font);
  transition: color 0.1s, border-color 0.1s;
}

.preset-btn:hover { color: var(--text); border-color: #444; }

/* Checks */
.checks-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.check-item {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.3rem 0.65rem;
  cursor: pointer;
  transition: border-color 0.1s, color 0.1s;
  user-select: none;
  color: var(--muted);
  font-size: 0.82rem;
}

.check-item:hover { color: var(--text); border-color: #444; }
.check-item.active { color: var(--text); border-color: #555; }

.check-item input[type=checkbox] { display: none; }

.check-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--border);
  flex-shrink: 0;
  transition: background 0.1s;
}

.check-item.active .check-dot { background: var(--text); }

/* Inputs */
.input-line {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.85rem;
  padding: 0.4rem 0;
  outline: none;
  transition: border-color 0.1s;
}

.input-line::placeholder { color: var(--muted); }
.input-line:focus { border-color: #555; }

.input-sm {
  width: 60px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.85rem;
  padding: 0.3rem 0.5rem;
  text-align: center;
  outline: none;
  transition: border-color 0.1s;
}

.input-sm:focus { border-color: #555; }

/* Rows */
.row {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.row-gap {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

/* Toggle */
.toggle-wrap {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  user-select: none;
}

.toggle-wrap input { display: none; }

.toggle-track {
  width: 32px; height: 16px;
  border: 1px solid var(--border);
  border-radius: 99px;
  position: relative;
  transition: border-color 0.15s;
  flex-shrink: 0;
}

.toggle-wrap input:checked + .toggle-track {
  background: var(--text);
  border-color: var(--text);
}

.toggle-track::after {
  content: '';
  position: absolute;
  top: 3px; left: 3px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--muted);
  transition: left 0.15s, background 0.15s;
}

.toggle-wrap input:checked + .toggle-track::after {
  left: 17px;
  background: var(--bg);
}

.toggle-label { font-size: 0.82rem; color: var(--muted); }
.toggle-wrap input:checked ~ .toggle-label { color: var(--text); }

/* Format buttons */
.fmt-row {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.fmt-btn {
  padding: 0.25rem 0.65rem;
  border-radius: 4px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.78rem;
  font-family: var(--mono);
  transition: color 0.1s, border-color 0.1s;
}

.fmt-btn:hover { color: var(--text); }
.fmt-btn.active { color: var(--text); border-color: var(--border); }

/* Divider */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1.25rem 0;
}

/* Count stepper */
.count-wrap {
  display: flex;
  align-items: center;
  background: var(--text);
  border-radius: 6px;
  overflow: hidden;
  flex-shrink: 0;
}

.count-btn {
  width: 36px;
  height: 44px;
  background: transparent;
  border: none;
  color: var(--bg);
  font-size: 1.2rem;
  font-weight: 300;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.1s;
  font-family: var(--font);
  line-height: 1;
}

.count-btn:hover { background: rgba(0,0,0,0.12); }
.count-btn:active { background: rgba(0,0,0,0.22); }

.count-val {
  min-width: 32px;
  text-align: center;
  font-size: 1rem;
  font-weight: 600;
  color: var(--bg);
  font-family: var(--mono);
  user-select: none;
}

/* Generate row */
.generate-row {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.generate-row .input-sm {
  width: 60px;
  flex-shrink: 0;
}

.generate-row .btn-generate {
  flex: 1;
}

/* Generate button */
.btn-generate {
  width: 100%;
  padding: 0.75rem;
  background: var(--text);
  border: none;
  border-radius: 6px;
  color: var(--bg);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: opacity 0.15s;
  font-family: var(--font);
}

.btn-generate:hover { opacity: 0.82; }
.btn-generate:active { opacity: 0.65; }

/* Strength */
#strengthCard {
  height: 30px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.35rem;
}

#strengthCard.hidden { visibility: hidden; }

.strength-bar {
  height: 2px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
  flex-shrink: 0;
}

.strength-fill {
  height: 100%;
  border-radius: 99px;
  transition: width 0.3s ease, background 0.3s ease;
  width: 0%;
}

.strength-meta {
  font-size: 0.72rem;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
}

.strength-label { font-weight: 600; }

/* Output */
.output-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-height: 38px;
}

.output-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--border);
}

.output-item:last-child { border-bottom: none; }

.output-val {
  flex: 1;
  font-family: var(--mono);
  font-size: 0.85rem;
  word-break: break-all;
  color: var(--text);
}

.btn-copy {
  background: transparent;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.72rem;
  font-family: var(--font);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: color 0.1s;
  white-space: nowrap;
  padding: 0;
}

.btn-copy:hover { color: var(--text); }
.btn-copy.copied { color: var(--success); }

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

/* Encoder */
.encode-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.encode-input-row {
  display: flex;
  align-items: flex-end;
  gap: 0.75rem;
}

#btnReEncode {
  font-size: 1.4rem;
  padding: 0.1rem 0.5rem;
  flex-shrink: 0;
}

.encode-result-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}

.encode-result {
  flex: 1;
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  word-break: break-all;
}

.encode-hints {
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.03em;
  min-height: 1em;
}

.btn-copy-all {
  background: transparent;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.72rem;
  font-family: var(--font);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: color 0.1s;
  padding: 0;
}

.btn-copy-all:hover { color: var(--text); }