:root {
  --bg-page: #e8ecec;
  --bg-card: #ffffff;
  --accent: #7ec4c4;
  --accent-soft: #b2d8d8;
  --accent-row: rgba(178, 216, 216, 0.45);
  --text: #2c3333;
  --text-muted: #5a6565;
  --shadow: 0 8px 24px rgba(44, 51, 51, 0.08);
  --radius: 10px;
  --radius-sm: 6px;
}

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

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: "Roboto", system-ui, -apple-system, sans-serif;
  font-size: 15px;
  color: var(--text);
  background: var(--bg-page);
  line-height: 1.45;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  background: var(--bg-card);
  box-shadow: 0 1px 0 rgba(44, 51, 51, 0.06);
}

.site-header__inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 20px 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 8px;
}

.site-header__brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.site-header__logo {
  font-size: 1.25rem;
  filter: hue-rotate(-15deg);
}

.site-header__title {
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

.site-header__h1 {
  margin: 6px 0 0;
  font-size: clamp(1.15rem, 2.5vw, 1.35rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--text);
  max-width: 36rem;
}

.site-header__lead {
  margin: 0;
  max-width: 40rem;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.5;
}

.site-footer {
  margin-top: auto;
}

.site-footer__inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 20px 22px;
  text-align: center;
}

.site-footer__link {
  font-size: 14px;
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.site-footer__link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent-soft);
}

.layout {
  flex: 1 1 auto;
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 20px 48px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 20px 24px;
  align-items: start;
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 26px 28px;
}

.card--settings {
  grid-column: 1;
  grid-row: 1;
}

.card--results {
  grid-column: 2;
  grid-row: 1 / span 2;
  display: flex;
  flex-direction: column;
  min-height: 420px;
}

.save-block {
  grid-column: 1;
  grid-row: 2;
  text-align: center;
}

.save-block__hint {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--text-muted);
}

.card__title {
  margin: 0 0 22px;
  font-size: 1.15rem;
  font-weight: 600;
}

.field {
  margin-bottom: 20px;
}

.field__label {
  display: block;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text);
}

.length-row {
  display: flex;
  align-items: flex-end;
  gap: 14px;
}

.slider-wrap {
  flex: 1;
  min-width: 0;
  padding-bottom: 4px;
}

.slider {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: #dde8e8;
  appearance: none;
  margin: 0 0 6px;
}

.slider::-webkit-slider-thumb {
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #fff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
  cursor: pointer;
}

.slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #fff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
  cursor: pointer;
}

.slider-ticks {
  position: relative;
  height: 1.35em;
  margin-top: 2px;
}

.slider-tick {
  position: absolute;
  top: 0;
  padding: 0;
  border: none;
  background: none;
  font-family: inherit;
  font-size: 11px;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1.2;
  transform: translateX(-50%);
}

.slider-tick:hover {
  color: var(--accent);
}

.slider-tick--edge-start {
  transform: translateX(0);
}

.slider-tick--edge-end {
  transform: translateX(-100%);
}

.input {
  width: 100%;
  max-width: 200px;
  padding: 10px 12px;
  border: 1px solid #cfd8d8;
  border-radius: var(--radius-sm);
  font: inherit;
  color: var(--text);
  background: #fafcfc;
}

.input--number {
  max-width: 72px;
  text-align: center;
}

.input:focus {
  outline: 2px solid var(--accent-soft);
  outline-offset: 1px;
}

.options {
  border: 0;
  margin: 0 0 12px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.charset-hint {
  margin: 0 0 18px;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.4;
}

.charset-hint strong {
  font-weight: 600;
  color: var(--text);
}

.strict-hint {
  margin: 0 0 18px;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.45;
}

.strict-hint strong {
  font-weight: 600;
  color: var(--text);
}

.card--settings .btn--primary {
  margin-bottom: 22px;
}

.card--settings .btn--save-params {
  width: 100%;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
}

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

.checkbox__box {
  width: 20px;
  height: 20px;
  border: 2px solid var(--accent-soft);
  border-radius: 4px;
  background: #fff;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  transition: background 0.15s, border-color 0.15s;
}

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

.checkbox input:checked + .checkbox__box::after {
  content: "";
  width: 5px;
  height: 9px;
  border: solid var(--text);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) translateY(-1px);
}

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

.error {
  margin: 0 0 14px;
  font-size: 14px;
  color: #b33a3a;
}

.btn {
  font-family: inherit;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 14px 20px;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s, opacity 0.15s;
}

.btn--primary {
  width: 100%;
  background: var(--accent-soft);
  color: var(--text);
  border-color: var(--accent);
}

.btn--primary:hover {
  background: var(--accent);
  color: #fff;
}

.btn--outline {
  width: 100%;
  background: transparent;
  color: var(--text);
  border-color: var(--accent-soft);
}

.btn--outline:hover:not(:disabled) {
  background: rgba(178, 216, 216, 0.35);
  border-color: var(--accent);
}

.btn--small {
  text-transform: none;
  font-weight: 500;
  letter-spacing: 0;
  padding: 10px 18px;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.password-list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  flex: 1;
  overflow-y: auto;
  max-height: min(52vh, 520px);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

@keyframes password-row-copied {
  0% {
    background-color: rgba(110, 210, 210, 0.78);
    border-color: rgba(70, 185, 185, 0.6);
  }
  100% {
    background-color: var(--accent-row);
    border-color: rgba(126, 196, 196, 0.35);
  }
}

.password-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: var(--accent-row);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(126, 196, 196, 0.35);
}

.password-row--copied {
  animation: password-row-copied 2s ease-out forwards;
}

.password-row code {
  flex: 1;
  font-family: "Roboto Mono", ui-monospace, monospace;
  font-size: 13px;
  word-break: break-all;
  color: var(--text);
}

.copy-btn {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: grid;
  background: none;
  place-items: center;
  transition: background 0.15s;
}

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

.copy-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.copy-btn svg {
  width: 18px;
  height: 18px;
}

#btn-download {
  margin-top: auto;
  width: 100%;
}

.empty-hint {
  margin: 0;
  padding: 24px 8px;
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
}

@media (max-width: 880px) {
  .layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }

  .card--settings {
    grid-column: 1;
    grid-row: auto;
  }

  .card--results {
    grid-column: 1;
    grid-row: auto;
    min-height: 280px;
  }
}