:root {
  --bg: #f4f5f7;
  --bg-elevated: #ffffff;
  --text: #14161a;
  --text-muted: #5c626e;
  --border: #e2e4e9;
  --border-strong: #c9cdd6;
  --accent: #3b5bfd;
  --accent-contrast: #ffffff;
  --accent-soft: #e8ecff;
  --danger: #e0433d;
  --warn: #e8962c;
  --warn-2: #f0b429;
  --good: #2fb670;
  --good-2: #1f9b6a;
  --track: #e6e8ee;
  --shadow: 0 1px 2px rgba(20, 22, 26, 0.04), 0 8px 24px -12px rgba(20, 22, 26, 0.12);
  --radius: 16px;
  --radius-sm: 10px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #101114;
  --bg-elevated: #17181c;
  --text: #eef0f3;
  --text-muted: #9aa0ac;
  --border: #262830;
  --border-strong: #34363f;
  --accent: #7d94ff;
  --accent-contrast: #0c0d10;
  --accent-soft: #232748;
  --danger: #f0655f;
  --warn: #f0a63e;
  --warn-2: #f0c34e;
  --good: #35c583;
  --good-2: #29a874;
  --track: #24262c;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px -12px rgba(0, 0, 0, 0.5);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px 60px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px 0 8px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 650;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.brand-icon {
  width: 22px;
  height: 22px;
  color: var(--accent);
  flex-shrink: 0;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}

.theme-toggle:hover { border-color: var(--border-strong); }
.theme-toggle:active { transform: scale(0.94); }

.theme-toggle .icon { width: 19px; height: 19px; }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

.content {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 12px;
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
}

.card-title {
  margin: 0 0 6px;
  font-size: 1.4rem;
  font-weight: 650;
  letter-spacing: -0.015em;
}

.card-title-sm {
  margin: 0 0 6px;
  font-size: 1.1rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.card-sub {
  margin: 0 0 22px;
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

/* Password field */
.pw-field {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 6px 6px 16px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.pw-field:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.pw-input {
  flex: 1;
  min-width: 0;
  border: none;
  background: transparent;
  color: var(--text);
  font-family: var(--mono);
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  padding: 10px 0;
  outline: none;
}

.pw-input::placeholder {
  font-family: var(--sans);
  letter-spacing: normal;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border: none;
  background: transparent;
  color: var(--text-muted);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.icon-btn:hover { background: var(--track); color: var(--text); }
.icon-btn:active { transform: scale(0.93); }
.icon-btn .icon { width: 20px; height: 20px; }

.icon-btn .icon-eye-off { display: block; }
.icon-btn .icon-eye { display: none; }
.icon-btn.is-visible .icon-eye-off { display: none; }
.icon-btn.is-visible .icon-eye { display: block; }

#copyBtn .icon-check { display: none; color: var(--good); }
#copyBtn.copied .icon-copy { display: none; }
#copyBtn.copied .icon-check { display: block; }

/* Przełącznik widoczności hasła (on/off) */
.visibility-switch {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
}

.switch {
  position: relative;
  display: inline-block;
  width: 42px;
  height: 24px;
  flex-shrink: 0;
  cursor: pointer;
}

.switch input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.switch-track {
  position: absolute;
  inset: 0;
  background: var(--track);
  border: 1.6px solid var(--border-strong);
  border-radius: 999px;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.switch-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--bg-elevated);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
  transition: transform 0.15s ease;
}

.switch input:checked + .switch-track {
  background: var(--accent);
  border-color: var(--accent);
}

.switch input:checked + .switch-track .switch-thumb {
  transform: translateX(18px);
  background: #ffffff;
}

.switch input:focus-visible + .switch-track {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.switch-label {
  font-size: 0.9rem;
  font-weight: 550;
  color: var(--text);
  cursor: pointer;
  user-select: none;
}

/* Options */
.options {
  margin-top: 22px;
}

.checkbox-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 16px;
  margin-bottom: 22px;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  cursor: pointer;
  user-select: none;
  color: var(--text);
}

.checkbox em { color: var(--text-muted); font-style: normal; }

.checkbox input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.checkbox .box {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  border-radius: 6px;
  border: 1.6px solid var(--border-strong);
  background: var(--bg-elevated);
  position: relative;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.checkbox .box::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 2px;
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  opacity: 0;
}

.checkbox input:checked + .box {
  background: var(--accent);
  border-color: var(--accent);
}

.checkbox input:checked + .box::after { opacity: 1; }

.checkbox input:focus-visible + .box {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.length-row {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.length-label {
  font-size: 0.92rem;
  font-weight: 550;
}

.length-controls {
  display: flex;
  align-items: center;
  gap: 14px;
}

input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 999px;
  background: var(--track);
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-elevated);
  box-shadow: 0 0 0 1px var(--accent);
  cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-elevated);
  box-shadow: 0 0 0 1px var(--accent);
  cursor: pointer;
}

#lengthInput {
  width: 62px;
  text-align: center;
  padding: 8px 4px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
  font-family: var(--mono);
}

#lengthInput:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.warning {
  margin: 12px 0 0;
  font-size: 0.85rem;
  color: var(--danger);
}

.actions {
  margin-top: 22px;
}

.btn {
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 13px 18px;
  border-radius: var(--radius-sm);
  border: none;
  font-size: 0.98rem;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.15s ease, transform 0.08s ease;
}

.btn .icon { width: 18px; height: 18px; }

.btn-primary {
  background: var(--accent);
  color: var(--accent-contrast);
}

.btn-primary:hover { filter: brightness(1.08); }
.btn-primary:active { transform: scale(0.985); }

/* Strength */
.strength {
  margin-top: 26px;
}

.strength-bar-track {
  height: 8px;
  border-radius: 999px;
  background: var(--track);
  overflow: hidden;
}

.strength-bar-fill {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  transition: width 0.25s ease, background 0.25s ease;
  background: var(--track);
}

.strength-bar-fill[data-level="trywialne"] { width: 12%; background: var(--danger); }
.strength-bar-fill[data-level="slabe"] { width: 40%; background: var(--warn); }
.strength-bar-fill[data-level="silne"] { width: 70%; background: var(--warn-2); }
.strength-bar-fill[data-level="bardzo-mocne"] { width: 100%; background: var(--good); }
.strength-bar-fill[data-level="empty"] { width: 0%; }

.strength-label-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-top: 10px;
}

.strength-label {
  font-weight: 650;
  font-size: 0.95rem;
}

.strength-label[data-level="trywialne"] { color: var(--danger); }
.strength-label[data-level="slabe"] { color: var(--warn); }
.strength-label[data-level="silne"] { color: var(--warn-2); }
.strength-label[data-level="bardzo-mocne"] { color: var(--good); }

.strength-entropy {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--mono);
}

/* Crack time table */
.crack-table {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.crack-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 0.88rem;
}

.crack-row:last-child { border-bottom: none; }
.crack-row:nth-child(odd) { background: var(--bg); }

.crack-scenario {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.crack-scenario .name {
  font-weight: 600;
  color: var(--text);
}

.crack-scenario .rate {
  color: var(--text-muted);
  font-size: 0.78rem;
}

.crack-time {
  font-family: var(--mono);
  font-weight: 650;
  white-space: nowrap;
  flex-shrink: 0;
  text-align: right;
}

.footnote {
  margin-top: 4px;
  padding: 0 6px;
}

.footnote p {
  color: var(--text-muted);
  font-size: 0.8rem;
  line-height: 1.6;
}

.footnote code {
  font-family: var(--mono);
  background: var(--track);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.78rem;
}

.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;
}

@media (max-width: 480px) {
  .card { padding: 20px; }
  .checkbox-grid { grid-template-columns: 1fr; }
  .crack-row { flex-direction: column; align-items: flex-start; gap: 4px; }
  .crack-time { align-self: flex-start; }
}