/* Proton-style: dark slate surfaces, one blue accent. Dark is the default; light follows the OS. */
:root {
  --bg: #16171d;
  --card: #1f2028;
  --raised: #2b2c36;
  --text: #ffffff;
  --muted: #a3a5b3;
  --line: #2f303b;
  --track: #121318;
  --hover: #262732;
  --accent: #5c99f7;
  --accent-hover: #7aadfa;
  --accent-text: #7aadfa;
  --on-accent: #0b1424;
  --primary: var(--accent);
  --on-primary: var(--on-accent);
  --shadow: 0 8px 24px #00000040;
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI Variable Text", "Segoe UI", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f3f4f7;
    --card: #ffffff;
    --raised: #ffffff;
    --text: #0c0d14;
    --muted: #6b6d7c;
    --line: #e2e3ea;
    --track: #eceef3;
    --hover: #f5f6f9;
    --accent-text: #2f6fd6;
    --shadow: 0 8px 24px #1a1d3a14;
    color-scheme: light;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
[hidden] { display: none !important; }

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  display: flex;
  justify-content: center;
  padding: 0 16px;
}

main { width: 100%; max-width: 600px; }

.site {
  margin: 28px 0 0;
  text-align: center;
  font-size: 13px;
  color: var(--muted);
}

/* Password */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 72px 0 48px;
}
.password {
  display: block;
  min-height: 1.3em;
  font-size: clamp(26px, 7vw, 46px);
  font-weight: 600;
  letter-spacing: -0.02em;
  text-align: center;
  overflow-wrap: anywhere;
  user-select: all;
}
.password.mono { font-family: var(--mono); font-weight: 500; letter-spacing: 0; }
.password.fade { animation: fade 0.2s ease; }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
.password .sep { color: var(--muted); }
.error { margin: 0; color: var(--text); font-size: 15px; text-align: center; max-width: 420px; }

.actions { display: flex; align-items: center; gap: 16px; margin-top: 36px; }

button { font: inherit; cursor: pointer; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.btn-copy {
  min-width: 128px;
  padding: 12px 28px;
  border: 0;
  border-radius: 999px;
  background: var(--primary);
  color: var(--on-primary);
  font-size: 16px;
  font-weight: 600;
  transition: background 0.15s;
}
.btn-copy:hover { background: var(--accent-hover); }
.btn-copy:disabled { opacity: 0.3; cursor: default; }
.btn-text { padding: 12px 10px; border: 0; background: none; font-size: 16px; color: var(--accent-text); }
.btn-text:hover { text-decoration: underline; text-underline-offset: 3px; }

.strength { margin: 22px 0 0; font-size: 13px; color: var(--muted); display: flex; align-items: center; gap: 10px; }
.meter { display: inline-flex; gap: 3px; }
.crack { margin: 14px 0 0; display: flex; gap: 28px; font-size: 13px; text-align: center; }
.crack div { display: flex; flex-direction: column; gap: 3px; }
.crack dt { color: var(--muted); }
.crack dd { margin: 0; color: var(--text); font-weight: 500; }
@media (max-width: 480px) { .crack { gap: 16px; font-size: 12px; } }
.meter i { width: 18px; height: 4px; border-radius: 2px; background: var(--raised); }
.meter[data-level="1"] i:nth-child(-n+1) { background: #e8615a; }
.meter[data-level="2"] i:nth-child(-n+2) { background: #f0b44c; }
.meter[data-level="3"] i:nth-child(-n+3) { background: var(--accent); }
.meter[data-level="4"] i:nth-child(-n+4) { background: #4cc38a; }

/* Settings card */
.settings {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 8px 20px 12px;
  box-shadow: var(--shadow);
}
.seg-mode { width: 100%; margin: 12px 0 8px; }
.seg-mode label { flex: 1; }
.seg-mode span { padding: 9px 10px; font-size: 15px; font-weight: 500; }
.seg.seg-mode input:checked + span { background: var(--accent); color: var(--on-accent); }

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}
.panel .row:first-child { border-top: 0; }
.row-top { align-items: flex-start; }
.label { font-size: 15px; }
.label small { display: block; font-size: 12px; color: var(--muted); margin-top: 2px; font-family: var(--mono); }
.value { color: var(--muted); margin-left: 6px; font-variant-numeric: tabular-nums; }

/* Segmented control built from radios */
.seg {
  display: inline-flex;
  background: var(--track);
  border-radius: 10px;
  padding: 3px;
  gap: 2px;
}
.seg-wrap { flex-wrap: wrap; justify-content: flex-end; }
.seg label { position: relative; }
.seg input, .chips input, .switch input { position: absolute; opacity: 0; pointer-events: none; }
.seg span {
  display: block;
  min-width: 36px;
  padding: 6px 10px;
  border-radius: 8px;
  text-align: center;
  font-size: 14px;
  color: var(--muted);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.seg input:checked + span { background: var(--raised); color: var(--text); box-shadow: 0 1px 3px #00000030; }
.seg input:focus-visible + span, .chips input:focus-visible + span, .switch input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 1px; }

/* Toggle chips */
.chips { display: flex; flex-wrap: wrap; gap: 6px; justify-content: flex-end; }
.chips span {
  display: block;
  padding: 6px 12px;
  border: 1px solid var(--raised);
  border-radius: 999px;
  font-size: 14px;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s;
}
.chips input:checked + span { background: var(--primary); border-color: var(--primary); color: var(--on-primary); }

/* Switch */
.switch { position: relative; flex-shrink: 0; }
.switch span {
  display: block;
  width: 44px;
  height: 26px;
  border-radius: 999px;
  background: var(--track);
  border: 1px solid var(--line);
  cursor: pointer;
  position: relative;
  transition: background 0.2s;
}
.switch span::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 1px 3px #00000040;
  transition: transform 0.2s;
}
.switch input:checked + span { background: var(--primary); border-color: var(--primary); }
.switch input:checked + span::after { transform: translateX(18px); }

/* Inputs */
.range-inputs { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 14px; }
.range-inputs input, .text-input {
  font: inherit;
  font-size: 15px;
  color: var(--text);
  background: var(--track);
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 7px 10px;
}
.range-inputs input { width: 64px; text-align: center; }
.text-input { width: 160px; font-family: var(--mono); }
.range-inputs input:focus, .text-input:focus { outline: none; border-color: var(--accent); }
.text-input:disabled { opacity: 0.4; }

.slider { width: 50%; accent-color: var(--primary); }

.btn-reset { display: block; margin: 4px auto 0; font-size: 13px; color: var(--muted); }
.btn-reset:hover { color: var(--text); }

footer { padding: 40px 0 32px; text-align: center; font-size: 12px; color: var(--muted); }

@media (max-width: 480px) {
  .hero { padding: 48px 0 36px; }
  .settings { padding: 8px 14px 12px; }
  .row { flex-wrap: wrap; }
  .slider { width: 100%; }
  .seg-wrap { justify-content: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  .password.fade { animation: none; }
  .seg span, .switch span, .switch span::after, .chips span { transition: none; }
}