:root {
  --bg-top: #f0d8b6;
  --bg-bottom: #f7f3ec;
  --panel: rgba(255, 252, 246, 0.88);
  --panel-strong: #fffaf2;
  --ink: #172033;
  --muted: #5a6272;
  --line: rgba(23, 32, 51, 0.14);
  --accent: #0d7c74;
  --accent-strong: #0b625c;
  --warm: #d77a3f;
  --shadow: 0 24px 72px rgba(64, 42, 23, 0.14);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --font-display: "Avenir Next", "Trebuchet MS", "Segoe UI", sans-serif;
  --font-body: "Segoe UI", "Helvetica Neue", "Trebuchet MS", sans-serif;
  --font-mono: "Cascadia Code", "Fira Code", "SF Mono", "Consolas", "Monaco", monospace;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.75), transparent 34%),
    linear-gradient(160deg, var(--bg-top), var(--bg-bottom) 52%, #fdfaf6 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(23, 32, 51, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 32, 51, 0.03) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.4), transparent 88%);
}

.page-shell {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.25rem 0 2.5rem;
}

.hero,
.panel {
  animation: rise-in 480ms ease both;
}

.hero {
  padding: 0.2rem 0 1rem;
}

.eyebrow,
.panel-kicker {
  margin: 0;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.72rem;
  color: var(--warm);
  font-weight: 700;
}

.hero h1 {
  margin: 0.45rem 0 0.6rem;
  max-width: 16ch;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.8vw, 3.85rem);
  line-height: 1;
}

.hero-copy {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.55;
}

.app-grid {
  display: grid;
  gap: 1.25rem;
}

.panel {
  position: relative;
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  overflow: hidden;
}

.panel::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid rgba(255, 255, 255, 0.4);
  pointer-events: none;
}

.pw-panel,
.settings-panel {
  padding: 1.1rem;
}

.pw-panel {
  display: grid;
  gap: 1rem;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.panel-head h2 {
  margin: 0.3rem 0 0;
  font-family: var(--font-display);
  font-size: 1.45rem;
}

/* ── Strength badge ────────────────────────────── */

.strength-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  background: rgba(23, 32, 51, 0.08);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  white-space: nowrap;
  transition: background 300ms ease, color 300ms ease;
}

/* ── Password display ──────────────────────────── */

.pw-stage {
  display: grid;
  place-items: center;
  min-height: 160px;
  padding: clamp(1rem, 3vw, 2rem);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.8), rgba(242, 236, 228, 0.9)),
    repeating-linear-gradient(
      45deg,
      rgba(23, 32, 51, 0.03),
      rgba(23, 32, 51, 0.03) 10px,
      transparent 10px,
      transparent 20px
    );
}

.pw-display {
  width: 100%;
  text-align: center;
  font-family: var(--font-mono);
  font-size: clamp(1.1rem, 2.8vw, 1.55rem);
  font-weight: 600;
  line-height: 1.65;
  word-break: break-all;
  user-select: all;
  -webkit-user-select: all;
  transition: opacity 250ms ease;
}

.pw-display.loading {
  opacity: 0.3;
}

.pw-char {
  transition: color 200ms ease;
}

.pw-char-letter {
  color: var(--ink);
}

.pw-char-number {
  color: var(--accent-strong);
}

.pw-char-symbol {
  color: var(--warm);
}

.pw-char:nth-child(4n) {
  margin-right: 0.08em;
}

/* ── Strength meter ────────────────────────────── */

.strength-track {
  height: 6px;
  border-radius: 3px;
  background: rgba(23, 32, 51, 0.08);
  overflow: hidden;
}

.strength-fill {
  height: 100%;
  width: 0;
  border-radius: 3px;
  background: var(--muted);
  transition: width 400ms ease, background 400ms ease;
}

/* ── Stats row ─────────────────────────────────── */

.stats-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.55rem;
}

.stat-chip {
  padding: 0.6rem 0.75rem;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.46);
  border: 1px solid rgba(23, 32, 51, 0.1);
}

.stat-chip span {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.stat-chip strong {
  display: block;
  margin-top: 0.18rem;
  font-size: 0.9rem;
  font-weight: 700;
}

/* ── Status & actions ──────────────────────────── */

.status-message {
  margin: 0;
  min-height: 1.4rem;
  color: var(--accent-strong);
  font-weight: 600;
  transition: color 200ms ease;
}

.status-message.error {
  color: #b01c23;
}

.action-row {
  display: grid;
  gap: 0.8rem;
}

.button {
  appearance: none;
  border: none;
  border-radius: 999px;
  padding: 0.92rem 1.15rem;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 180ms ease,
    opacity 180ms ease,
    background 180ms ease,
    color 180ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button:active {
  transform: translateY(1px);
}

.button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.button-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
}

.button-secondary {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--line);
}

.button-ghost {
  color: var(--ink);
  background: rgba(215, 122, 63, 0.12);
}

/* ── Settings panel ────────────────────────────── */

.settings-panel {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.controls-form {
  display: grid;
  gap: 1rem;
}

.easy-section {
  display: grid;
  gap: 0.8rem;
}

.section-copy h3 {
  margin: 0.3rem 0 0;
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.field {
  display: grid;
  gap: 0.55rem;
}

.field span,
.field strong {
  font-size: 0.93rem;
}

.field input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

/* ── Charset cards ─────────────────────────────── */

.charset-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}

.charset-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.74);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.55);
  cursor: pointer;
  transition: border-color 200ms ease, background 200ms ease, box-shadow 200ms ease;
}

.charset-card:hover {
  border-color: rgba(23, 32, 51, 0.22);
}

.charset-card[data-active="true"] {
  border-color: rgba(13, 124, 116, 0.55);
  background: rgba(13, 124, 116, 0.1);
  box-shadow:
    0 8px 20px rgba(13, 124, 116, 0.06),
    inset 0 0 0 1px rgba(13, 124, 116, 0.15);
}

.charset-card input[type="checkbox"] {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--accent);
  flex-shrink: 0;
}

.charset-info {
  min-width: 0;
}

.charset-info strong {
  display: block;
  font-size: 0.92rem;
}

.charset-info span {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.1rem;
}

/* ── Advanced settings ─────────────────────────── */

.advanced-settings {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.56);
  overflow: hidden;
}

.advanced-settings summary {
  list-style: none;
  cursor: pointer;
  padding: 1rem 1.05rem;
  font-weight: 700;
}

.advanced-settings summary::-webkit-details-marker {
  display: none;
}

.advanced-settings summary::after {
  content: "+";
  float: right;
  color: var(--warm);
  font-size: 1.1rem;
}

.advanced-settings[open] summary::after {
  content: "\2212";
}

.advanced-body {
  display: grid;
  gap: 0.75rem;
  padding: 0 1.05rem 1.05rem;
  border-top: 1px solid rgba(23, 32, 51, 0.08);
}

.checkbox-field {
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.7);
}

.checkbox-field label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
}

.checkbox-field input {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--accent);
  flex-shrink: 0;
}

.checkbox-field span {
  font-size: 0.93rem;
}

/* ── FAQ section ───────────────────────────────── */

.faq-section {
  padding: 2rem 0 0.5rem;
  animation: rise-in 480ms ease both;
}

.faq-section h2 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: 1.45rem;
}

.faq-grid {
  display: grid;
  gap: 0.6rem;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel);
  backdrop-filter: blur(8px);
  overflow: hidden;
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 1rem 1.1rem;
  font-weight: 700;
  font-size: 0.95rem;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  float: right;
  color: var(--warm);
  font-size: 1.1rem;
}

.faq-item[open] summary::after {
  content: "\2212";
}

.faq-item p {
  margin: 0;
  padding: 0 1.1rem 1.1rem;
  border-top: 1px solid rgba(23, 32, 51, 0.06);
  padding-top: 0.8rem;
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.6;
}

.faq-item code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 0.15em 0.4em;
  border-radius: 6px;
  background: rgba(23, 32, 51, 0.06);
}

/* ── Suite nav ─────────────────────────────────── */

.suite-nav {
  padding: 1.8rem 0 0.5rem;
  animation: rise-in 480ms ease both;
}

.suite-label {
  margin: 0 0 0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.72rem;
  color: var(--warm);
  font-weight: 700;
}

.suite-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.suite-link {
  display: inline-flex;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.6);
  color: var(--ink);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.suite-link:hover {
  background: rgba(255, 255, 255, 0.92);
  border-color: rgba(23, 32, 51, 0.22);
  transform: translateY(-1px);
}

.suite-link.active {
  border-color: rgba(13, 124, 116, 0.4);
  background: rgba(13, 124, 116, 0.1);
  color: var(--accent-strong);
}

/* ── Footer ────────────────────────────────────── */

.site-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1rem;
  padding: 1rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-meta a {
  color: var(--accent-strong);
  text-underline-offset: 0.18em;
  text-decoration-thickness: 0.08em;
}

/* ── Animation ─────────────────────────────────── */

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(16px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Responsive ────────────────────────────────── */

@media (min-width: 860px) {
  .app-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
    align-items: start;
  }

  .pw-panel {
    position: sticky;
    top: 1rem;
  }

  .action-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .faq-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 859px) {
  .page-shell {
    width: min(100% - 1rem, 960px);
    padding-top: 0.85rem;
  }

  .app-grid {
    grid-template-areas:
      "password"
      "settings";
  }

  .pw-panel {
    grid-area: password;
  }

  .settings-panel {
    grid-area: settings;
  }
}

@media (max-width: 560px) {
  .hero h1 {
    max-width: 12ch;
  }

  .panel-head {
    flex-direction: column;
  }

  .stats-row {
    grid-template-columns: 1fr;
  }

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

  .pw-stage {
    min-height: 120px;
    padding: 0.85rem;
  }

  .pw-panel,
  .settings-panel {
    padding: 0.95rem;
  }
}