:root {
  --bg: #f3f4f6;
  --card: #ffffff;
  --text: #1f2937;
  --text-soft: #6b7280;
  --border: #e5e7eb;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --input-bg: #f9fafb;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 8px 24px rgba(0,0,0,.06);
  --radius: 14px;
}

[data-theme="dark"] {
  --bg: #0f172a;
  --card: #1e293b;
  --text: #e2e8f0;
  --text-soft: #94a3b8;
  --border: #334155;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --input-bg: #0f172a;
  --shadow: 0 1px 3px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.3);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background .25s, color .25s;
}

/* Header */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 720px;
  margin: 0 auto;
  padding: 18px 20px;
}
.brand { display: flex; align-items: center; gap: 9px; font-weight: 800; font-size: 1.12rem; color: var(--text); text-decoration: none; letter-spacing: -.01em; }
.brand-logo { display: block; flex-shrink: 0; }
.brand-name { white-space: nowrap; }
.brand-tld { color: var(--accent); }
.main-nav { display: flex; gap: 6px; margin-left: auto; margin-right: 12px; }
.main-nav a {
  padding: 8px 14px;
  border-radius: 9px;
  text-decoration: none;
  color: var(--text-soft);
  font-weight: 600;
  font-size: .92rem;
  transition: background .15s, color .15s;
}
.main-nav a:hover { color: var(--text); background: var(--input-bg); }
.main-nav a.active { color: var(--accent); background: var(--input-bg); }
.brand-logo { font-size: 1.4rem; }
.theme-toggle {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  width: 42px; height: 42px;
  font-size: 1.1rem;
  cursor: pointer;
  transition: transform .15s;
}
.theme-toggle:hover { transform: scale(1.05); }

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

.hero { text-align: center; margin: 12px 0 28px; }
.hero h1 { font-size: 1.9rem; line-height: 1.2; margin-bottom: 10px; }
.subtitle { color: var(--text-soft); max-width: 540px; margin: 0 auto; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 24px;
}

/* Output */
.output-row {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}
.password-output {
  flex: 1;
  font-family: "SF Mono", "Fira Code", Consolas, monospace;
  font-size: 1.15rem;
  letter-spacing: .5px;
  padding: 14px 16px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  min-width: 0;
}
.icon-btn {
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  width: 50px;
  font-size: 1.15rem;
  cursor: pointer;
  transition: background .15s, transform .1s;
}
.icon-btn:hover { background: var(--accent); transform: translateY(-1px); }
.icon-btn:active { transform: translateY(0); }

/* Strength */
.strength { margin-bottom: 22px; }
.strength-bar {
  height: 8px;
  background: var(--input-bg);
  border-radius: 99px;
  overflow: hidden;
  border: 1px solid var(--border);
}
#strength-fill {
  display: block;
  height: 100%;
  width: 0;
  border-radius: 99px;
  transition: width .35s, background .35s;
}
.strength-meta {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  font-size: .85rem;
  color: var(--text-soft);
}
#strength-label { font-weight: 600; }
.entropy { font-variant-numeric: tabular-nums; }

/* Tabs */
.tabs {
  display: flex;
  gap: 6px;
  background: var(--input-bg);
  padding: 5px;
  border-radius: 12px;
  margin-bottom: 20px;
  border: 1px solid var(--border);
}
.tab {
  flex: 1;
  padding: 9px;
  border: none;
  background: transparent;
  color: var(--text-soft);
  font-weight: 600;
  font-size: .92rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all .15s;
}
.tab.active { background: var(--card); color: var(--accent); box-shadow: 0 1px 3px rgba(0,0,0,.1); }

/* Options */
.options { display: flex; flex-direction: column; gap: 16px; margin-bottom: 18px; }
.option-row { display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.option-row > label { font-weight: 600; white-space: nowrap; }
.length-control { display: flex; align-items: center; gap: 12px; flex: 1; }
input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  cursor: pointer;
}
output {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent);
  min-width: 28px;
  text-align: right;
}
select {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--input-bg);
  color: var(--text);
  cursor: pointer;
  font-size: .92rem;
}

.checkbox-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.check {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 9px;
  cursor: pointer;
  font-size: .92rem;
  transition: border-color .15s;
}
.check:hover { border-color: var(--accent); }
.check input { accent-color: var(--accent); width: 16px; height: 16px; cursor: pointer; }
.hint { color: var(--text-soft); font-size: .8rem; margin-left: auto; font-family: monospace; }

.bulk-row { margin-bottom: 18px; }

.generate-btn {
  width: 100%;
  padding: 15px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 11px;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  transition: background .15s, transform .1s;
}
.generate-btn:hover { background: var(--accent-hover); transform: translateY(-1px); }
.generate-btn:active { transform: translateY(0); }

/* Bulk list */
.bulk-list { list-style: none; margin-top: 18px; display: flex; flex-direction: column; gap: 8px; }
.bulk-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 10px 14px;
}
.bulk-list code {
  flex: 1;
  font-family: "SF Mono", Consolas, monospace;
  font-size: .95rem;
  word-break: break-all;
  background: none;
  color: var(--text);
}
.bulk-list button {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  opacity: .6;
  transition: opacity .15s;
}
.bulk-list button:hover { opacity: 1; }

/* Toast */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #111827;
  color: #fff;
  padding: 11px 22px;
  border-radius: 99px;
  font-size: .9rem;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s, transform .25s;
  z-index: 100;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* Content sections */
.content h2, .faq h2 { font-size: 1.3rem; margin: 22px 0 10px; }
.content h2:first-child, .faq h2:first-child { margin-top: 0; }
.content p, .content ul { margin-bottom: 12px; color: var(--text); }
.content ul { padding-left: 22px; }
.content li { margin-bottom: 6px; }
.content code, .faq code {
  background: var(--input-bg);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 5px;
  font-size: .88em;
  font-family: monospace;
}

.faq details {
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
}
.faq details:last-child { border-bottom: none; }
.faq summary {
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq summary::after { content: "+"; font-size: 1.3rem; color: var(--accent); }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin-top: 10px; color: var(--text-soft); }

/* Ad slot */
.ad-slot {
  margin: 0 0 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.ad-placeholder {
  width: 100%;
  min-height: 100px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  background: repeating-linear-gradient(
    45deg, var(--input-bg), var(--input-bg) 12px,
    var(--card) 12px, var(--card) 24px);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  color: var(--text-soft);
  text-align: center;
  padding: 18px;
}
.ad-placeholder span {
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  font-size: .72rem;
}
.ad-placeholder small { font-size: .78rem; opacity: .8; }

/* History panel */
.history-wrap { margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--border); }
.history-head {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 10px;
  font-size: .85rem; font-weight: 600; color: var(--text-soft);
}
.link-btn {
  background: none; border: none; color: var(--accent);
  font-weight: 600; cursor: pointer; font-size: .85rem; padding: 2px 4px;
}
.link-btn:hover { text-decoration: underline; }

/* Password Checkup */
.checkup-title { font-size: 1.3rem; margin-bottom: 6px; }
.checkup-sub { color: var(--text-soft); font-size: .92rem; margin-bottom: 18px; }
.feedback-list { list-style: none; margin: 12px 0 18px; display: flex; flex-direction: column; gap: 6px; }
.feedback-list li {
  font-size: .9rem; color: var(--text-soft);
  padding-left: 22px; position: relative;
}
.feedback-list li::before { content: "•"; position: absolute; left: 6px; color: var(--accent); }
.feedback-list li.good { color: #10b981; }
.feedback-list li.good::before { content: "✓"; color: #10b981; }

.generate-btn.secondary { background: var(--input-bg); color: var(--text); border: 1px solid var(--border); }
.generate-btn.secondary:hover:not(:disabled) { background: var(--border); }
.generate-btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }

.breach-result {
  margin-top: 14px; padding: 14px 16px; border-radius: 10px;
  font-size: .92rem; line-height: 1.5;
}
.breach-result.checking { background: var(--input-bg); color: var(--text-soft); }
.breach-result.good { background: rgba(16,185,129,.12); color: #047857; border: 1px solid rgba(16,185,129,.3); }
.breach-result.bad  { background: rgba(239,68,68,.12); color: #b91c1c; border: 1px solid rgba(239,68,68,.3); }
.breach-result.warn { background: rgba(245,158,11,.12); color: #b45309; border: 1px solid rgba(245,158,11,.3); }
[data-theme="dark"] .breach-result.good { color: #6ee7b7; }
[data-theme="dark"] .breach-result.bad { color: #fca5a5; }
[data-theme="dark"] .breach-result.warn { color: #fcd34d; }

.privacy-note { font-size: .8rem; color: var(--text-soft); margin-top: 14px; }
.privacy-note a { color: var(--accent); }

/* Tools hub grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.tool-card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  text-decoration: none;
  color: var(--text);
  box-shadow: var(--shadow);
  transition: transform .15s, border-color .15s;
}
.tool-card:hover { transform: translateY(-3px); border-color: var(--accent); }
.tool-card .tool-icon { font-size: 1.8rem; display: block; margin-bottom: 10px; }
.tool-card h3 { font-size: 1.05rem; margin-bottom: 4px; }
.tool-card p { font-size: .88rem; color: var(--text-soft); }
.tool-card.soon { opacity: .55; pointer-events: none; }
.tool-card .badge { font-size: .7rem; background: var(--input-bg); border: 1px solid var(--border); border-radius: 99px; padding: 2px 8px; color: var(--text-soft); }

/* Generic tool I/O */
.io-row { display: flex; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; }
.io-area {
  width: 100%;
  font-family: "SF Mono", Consolas, monospace;
  font-size: .95rem;
  padding: 12px 14px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  resize: vertical;
  min-height: 90px;
}
.result-box {
  display: flex; align-items: center; gap: 8px;
  background: var(--input-bg); border: 1px solid var(--border);
  border-radius: 10px; padding: 12px 14px; margin-bottom: 8px;
}
.result-box code { flex: 1; font-family: "SF Mono", Consolas, monospace; word-break: break-all; background: none; }

/* Footer */
.site-footer {
  text-align: center;
  padding: 30px 20px 40px;
  color: var(--text-soft);
  font-size: .9rem;
  border-top: 1px solid var(--border);
  max-width: 720px;
  margin: 0 auto;
}
.footer-links { margin: 10px 0; display: flex; gap: 8px; justify-content: center; }
.footer-links a { color: var(--accent); text-decoration: none; }
.footer-links a:hover { text-decoration: underline; }
.copyright { font-size: .82rem; margin-top: 6px; }

/* Modal */
.modal {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.5);
  display: flex; align-items: center; justify-content: center;
  padding: 20px; z-index: 200;
}
.modal-box {
  background: var(--card);
  border-radius: var(--radius);
  max-width: 540px; width: 100%;
  max-height: 80vh; overflow-y: auto;
  padding: 28px; position: relative;
}
.modal-close {
  position: absolute; top: 16px; right: 16px;
  background: none; border: none; font-size: 1.2rem;
  cursor: pointer; color: var(--text-soft);
}
.modal-box h2 { margin-bottom: 14px; }
.modal-box p { margin-bottom: 12px; color: var(--text-soft); }

.hidden { display: none !important; }

@media (max-width: 560px) {
  .site-header { flex-wrap: wrap; gap: 10px; padding: 14px 16px; }
  .brand { font-size: 1rem; }
  .main-nav { order: 3; width: 100%; margin: 0; justify-content: center; }
  .main-nav a { flex: 1; text-align: center; }
  .theme-toggle { margin-left: auto; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.55rem; }
  .checkbox-grid { grid-template-columns: 1fr; }
  .card { padding: 18px; }
}