:root {
  color-scheme: light dark;
  --bg: #eef4f2;
  --panel: #fbfdfc;
  --text: #142321;
  --muted: #637370;
  --line: #cfdcd8;
  --soft: #edf6f3;
  --accent: #1f6f62;
  --accent-strong: #174f47;
  --success: #0f7a55;
  --medium: #b06b00;
  --danger: #b23838;
  --danger-soft: #fff1f1;
  --focus: #b07a1a;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  display: grid;
  place-items: center;
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at top, rgba(31, 111, 98, 0.10), transparent 34rem),
    var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.45;
  letter-spacing: 0;
}

button,
input,
a {
  font: inherit;
}

.page {
  width: min(100% - 24px, 780px);
  margin: 0 auto;
  padding: 16px 0;
}

.tool-shell {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 45px rgba(20, 35, 33, 0.08);
  padding: 18px;
}

.tool-header {
  display: grid;
  justify-items: center;
  text-align: center;
}

.title-row {
  display: inline-grid;
  grid-template-columns: minmax(0, auto) 32px;
  align-items: center;
  gap: 8px;
  max-width: 100%;
}

.title-row h1 {
  min-width: 0;
}

.privacy-note,
.status {
  color: var(--muted);
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(1.55rem, 4vw, 2.1rem);
  line-height: 1.12;
  display: inline-grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 7px;
  text-align: left;
}

.title-icon {
  line-height: 1;
}

.help-button {
  width: 30px;
  height: 30px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--soft);
  color: var(--accent-strong);
  cursor: pointer;
  display: grid;
  place-items: center;
  font-size: 0.95rem;
  font-weight: 850;
  line-height: 1;
  text-decoration: none;
}

.help-button:hover {
  border-color: var(--accent);
}

.message {
  margin: 12px 0 0;
  border-radius: 8px;
  padding: 9px 11px;
  font-size: 0.92rem;
  font-weight: 700;
}

.message-error {
  border: 1px solid #e6b8b8;
  background: var(--danger-soft);
  color: var(--danger);
}

.output-section,
.settings,
.privacy-note {
  margin-top: 14px;
}

.passphrase-output {
  width: 100%;
  min-height: 78px;
  border: 0;
  border-radius: 6px;
  background:
    linear-gradient(90deg, rgba(31, 111, 98, 0.12), rgba(31, 111, 98, 0) 42%),
    var(--soft);
  color: var(--text);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  text-align: center;
  font-size: clamp(1.04rem, 2.5vw, 1.28rem);
  font-weight: 650;
  line-height: 1.42;
  overflow: hidden;
  user-select: text;
  white-space: normal;
  cursor: pointer;
}

.passphrase-output:empty {
  cursor: default;
}

.passphrase-token {
  display: inline-flex;
  flex: 0 0 auto;
  white-space: nowrap;
}

.passphrase-output-long {
  font-size: clamp(0.94rem, 2.15vw, 1.12rem);
}

.passphrase-output-very-long {
  font-size: clamp(0.84rem, 1.9vw, 1rem);
}

.passphrase-output-extra-long {
  font-size: clamp(0.76rem, 1.7vw, 0.9rem);
}

.passphrase-separator {
  color: var(--medium);
  font-weight: 850;
}

.passphrase-digit {
  color: var(--danger);
  font-weight: 850;
}

.button-row {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
}

.button {
  min-height: 38px;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 7px 14px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-weight: 750;
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.button-primary {
  background: var(--accent);
  color: #ffffff;
}

.button-primary:hover:not(:disabled) {
  background: var(--accent-strong);
}

.button-secondary {
  border-color: var(--line);
  background: #ffffff;
  color: var(--text);
}

.button-secondary:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.button-copied,
.button-copied:hover:not(:disabled) {
  border-color: var(--success);
  color: var(--success);
}

.is-spinning span:first-child {
  animation: refresh-spin 0.45s ease-in-out;
}

@keyframes refresh-spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.status {
  min-height: 22px;
  margin: 6px 0 0;
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 22px;
  text-align: center;
}

.status-success {
  color: var(--accent-strong);
}

.status-error {
  color: var(--danger);
}

.settings {
  display: grid;
  grid-template-columns: repeat(2, 120px) 190px;
  align-items: end;
  justify-content: center;
  gap: 14px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.field {
  display: grid;
  gap: 5px;
}

.field label,
.check-row label {
  font-size: 0.9rem;
  font-weight: 750;
}

.field label {
  text-align: center;
}

.field input[type="number"],
.field input[type="text"] {
  width: 100%;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--text);
  padding: 7px 9px;
}

.field input[type="number"],
.field input[type="text"] {
  text-align: center;
}

.check-row {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  align-items: center;
  gap: 8px;
  min-height: 28px;
}

.check-row input {
  width: 17px;
  height: 17px;
  accent-color: var(--accent);
}

.check-group {
  display: grid;
  gap: 8px;
  justify-items: start;
  align-content: center;
  min-height: 64px;
  width: 190px;
}

.entropy-very-weak,
.entropy-weak,
.entropy-low {
  color: var(--danger);
}

.entropy-good,
.entropy-medium {
  color: var(--medium);
}

.entropy-strong,
.entropy-very-strong {
  color: var(--success);
}

.privacy-note {
  border-top: 1px solid var(--line);
  padding-top: 10px;
  margin-bottom: 0;
  font-size: 0.78rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 3px 14px;
  text-align: center;
}

.privacy-note span,
.privacy-note a {
  font-size: inherit;
  line-height: inherit;
}

.privacy-note a {
  color: inherit;
  opacity: 0.86;
  text-decoration: none;
}

.privacy-note a:hover {
  color: var(--accent-strong);
  opacity: 1;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.screen-reader-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

@media (max-width: 680px) {
  body {
    place-items: start center;
  }

  .page {
    width: min(100% - 16px, 780px);
    padding: 10px 0;
  }

  .tool-shell {
    padding: 14px;
  }

  .settings {
    grid-template-columns: minmax(110px, 170px) minmax(110px, 170px);
    justify-items: center;
  }

  .check-group {
    grid-column: 1 / -1;
    min-height: 0;
    width: auto;
    justify-items: center;
  }

  .check-row {
    justify-content: center;
  }
}

@media (max-width: 440px) {
  .button-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .settings {
    grid-template-columns: 1fr;
  }

  .field,
  .field-number {
    width: min(100%, 170px);
    max-width: 170px;
    justify-self: center;
  }

  .check-group {
    justify-self: center;
  }

  .title-row {
    grid-template-columns: minmax(0, 1fr) 30px;
  }

  h1 {
    font-size: 1.28rem;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1716;
    --panel: #172220;
    --text: #edf7f4;
    --muted: #a7bbb6;
    --line: #304541;
    --soft: #132b27;
    --accent: #75d0bd;
    --accent-strong: #a0e1d4;
    --success: #6ee3b2;
    --medium: #ffc45c;
    --danger: #ff8e8e;
    --danger-soft: #3a2020;
    --focus: #f0b44c;
  }

  .tool-shell {
    box-shadow: 0 18px 45px rgba(0, 0, 0, 0.28);
  }

  .button-secondary,
  .field input[type="number"],
  .field input[type="text"] {
    background: #111c1a;
  }

  .button-primary {
    color: #071615;
  }

}