:root {
  --poor:#ef4444;
  --good:#f59e0b;
  --verygood:#22c55e;
  --strong:#16a34a;

  --bg:#0f172a;
  --card-bg:#0b1220;
  --border:#1f2937;
  --text:#e5e7eb;
  --muted:#9ca3af;

  --accent:#6366f1;
  --accent-soft:#4f46e5;
  --accent-strong:#4338ca;

  --btn-bg:#2563eb;
  --btn-hover:#1d4ed8;
  --copy-bg:#16a34a;
  --copy-hover:#15803d;
}

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

html, body {
  margin:0;
  padding:0;
  font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  background:radial-gradient(circle at top,#1e293b,#020617 55%);
  color:var(--text);
}

body {
  min-height:100vh;
  display:flex;
  flex-direction:column;
}

/* HEADER + NAVBAR */

.site-header {
  position:sticky;
  top:0;
  z-index:50;
  backdrop-filter:blur(14px);
  background:linear-gradient(to right,rgba(15,23,42,0.98),rgba(15,23,42,0.94));
  border-bottom:1px solid rgba(148,163,184,0.35);
}

.nav-shell {
  max-width:1024px;
  margin:0 auto;
  padding:10px 16px;
  display:flex;
  align-items:center;
  justify-content:space-between;
}

.brand {
  display:flex;
  align-items:center;
  gap:8px;
  font-weight:700;
  letter-spacing:0.02em;
  color:#e5e7eb;
}

.brand-logo {
  width:30px;
  height:30px;
  border-radius:12px;
  display:flex;
  align-items:center;
  justify-content:center;
  background:radial-gradient(circle at 30% 0%,#22c55e,#0ea5e9);
  font-size:18px;
}

.brand small {
  display:block;
  font-size:11px;
  font-weight:500;
  color:var(--muted);
}

/* Desktop links */

.nav-links {
  display:flex;
  align-items:center;
  gap:8px;
}

.nav-links a {
  position:relative;
  padding:6px 12px;
  border-radius:999px;
  font-size:14px;
  text-decoration:none;
  color:var(--muted);
  transition:color 0.2s, background 0.2s;
}

.nav-links a::after {
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:5px;
  height:2px;
  border-radius:999px;
  background:linear-gradient(to right,#22c55e,#6366f1);
  opacity:0;
  transform:scaleX(0.5);
  transform-origin:center;
  transition:opacity 0.2s, transform 0.2s;
}

.nav-links a:hover {
  color:#e5e7eb;
  background:rgba(15,23,42,0.9);
}

.nav-links a.active {
  color:#e5e7eb;
  background:rgba(15,23,42,0.96);
}

.nav-links a.active::after {
  opacity:1;
  transform:scaleX(1);
}

/* Mobile toggle */

.nav-toggle {
  display:none;
  width:34px;
  height:34px;
  border-radius:999px;
  border:1px solid rgba(148,163,184,0.7);
  background:rgba(15,23,42,0.8);
  color:#e5e7eb;
  align-items:center;
  justify-content:center;
  cursor:pointer;
}

.nav-toggle span {
  display:block;
  width:18px;
  height:2px;
  margin:2px 0;
  border-radius:999px;
  background:#e5e7eb;
  transition:transform 0.2s, opacity 0.2s;
}

/* Mobile menu panel */

.mobile-menu {
  display:none;
  flex-direction:column;
  gap:4px;
  padding:8px 16px 12px;
  border-top:1px solid rgba(148,163,184,0.4);
  background:rgba(15,23,42,0.97);
}

.mobile-menu a {
  padding:10px 8px;
  border-radius:8px;
  font-size:15px;
  text-decoration:none;
  color:var(--muted);
}

.mobile-menu a.active,
.mobile-menu a:hover {
  color:#e5e7eb;
  background:rgba(30,64,175,0.45);
}

/* Main layout */

.main-shell {
  flex:1;
  display:flex;
  justify-content:center;
  padding:24px 16px 32px;
}

.page-center {
  width:100%;
  max-width:960px;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:24px;
}

/* Hero / heading */

.page-heading {
  text-align:center;
  max-width:640px;
}

.page-heading h1 {
  margin:0 0 6px;
  font-size:1.9rem;
}

.page-heading p {
  margin:0;
  font-size:0.95rem;
  color:var(--muted);
}

/* Card container */

.card {
  width:100%;
  max-width:520px;
  background:radial-gradient(circle at top left,rgba(56,189,248,0.12),rgba(15,23,42,0.98));
  border-radius:18px;
  padding:20px 18px 18px;
  border:1px solid rgba(148,163,184,0.3);
  box-shadow:
    0 22px 65px rgba(15,23,42,0.85),
    0 0 0 1px rgba(15,23,42,1);
}

.card h2 {
  margin:0 0 4px;
  font-size:1.2rem;
  text-align:left;
}

.card-subtitle {
  margin:0 0 12px;
  font-size:0.85rem;
  color:var(--muted);
}

label {
  display:block;
  font-size:0.9rem;
  margin-top:10px;
}

input[type="password"],
input[type="text"],
input[type="number"],
input[type="range"] {
  width:100%;
  margin-top:6px;
  padding:11px 11px;
  border-radius:10px;
  border:1px solid rgba(148,163,184,0.4);
  background:rgba(15,23,42,0.95);
  color:var(--text);
  font-size:0.95rem;
  outline:none;
  transition:border 0.15s, box-shadow 0.15s, background 0.15s;
}

input[type="password"]:focus,
input[type="text"]:focus,
input[type="number"]:focus,
input[type="range"]:focus {
  border-color:#6366f1;
  box-shadow:0 0 0 1px rgba(99,102,241,0.55);
}

/* Range tweak */

input[type="range"] {
  padding:0;
  background:transparent;
}

/* Buttons */

.button {
  width:100%;
  margin-top:14px;
  padding:10px 12px;
  border-radius:999px;
  border:none;
  background:linear-gradient(to right,#2563eb,#6366f1);
  color:white;
  font-size:0.95rem;
  font-weight:500;
  cursor:pointer;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:6px;
  box-shadow:0 14px 30px rgba(37,99,235,0.42);
  transition:transform 0.15s, box-shadow 0.15s, background 0.15s;
}

.button:hover {
  background:linear-gradient(to right,#1d4ed8,#4f46e5);
  transform:translateY(-1px);
  box-shadow:0 18px 40px rgba(37,99,235,0.55);
}

.button:active {
  transform:translateY(0);
  box-shadow:0 10px 18px rgba(15,23,42,0.9);
}

.button-secondary {
  background:rgba(15,23,42,0.85);
  border:1px solid rgba(148,163,184,0.5);
  box-shadow:none;
}

.button-secondary:hover {
  background:rgba(30,64,175,0.6);
}

/* Copy button variant */

.copy-btn {
  background:linear-gradient(to right,#22c55e,#16a34a);
  box-shadow:0 14px 30px rgba(22,163,74,0.4);
}

.copy-btn:hover {
  background:linear-gradient(to right,#16a34a,#15803d);
}

/* Strength + entropy bars */

.bar,
.entropy-bar {
  height:8px;
  background:rgba(15,23,42,0.9);
  border-radius:999px;
  overflow:hidden;
  margin-top:8px;
  border:1px solid rgba(15,23,42,0.9);
}

.bar-fill,
.entropy-fill {
  height:100%;
  width:0;
  transition:all 0.35s ease;
}

.strength-text,
.crack-time {
  margin-top:6px;
  font-size:0.9rem;
}

.strength-text {
  font-weight:600;
}

.entropy {
  margin-top:10px;
  font-size:0.82rem;
  color:var(--muted);
}

.entropy small {
  display:block;
  margin-bottom:4px;
}

#entropyValue {
  display:block;
  margin-top:3px;
}

/* Generated output */

.generated {
  margin-top:12px;
  padding:10px 12px;
  border-radius:12px;
  background:rgba(15,23,42,0.95);
  border:1px dashed rgba(148,163,184,0.55);
  font-family:"SF Mono",ui-monospace,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;
  font-size:0.9rem;
  word-break:break-all;
  min-height:32px;
  display:flex;
  align-items:center;
}

/* Options row */

.options-row {
  display:flex;
  flex-wrap:wrap;
  gap:8px 14px;
  margin-top:8px;
  font-size:0.85rem;
}

.options-row label {
  display:flex;
  align-items:center;
  gap:4px;
  margin:0;
}

.options-row input[type="checkbox"] {
  width:auto;
}

/* Helper text */

.helper {
  margin-top:8px;
  font-size:0.8rem;
  color:var(--muted);
}

/* Toast */

.toast {
  position:fixed;
  top:18px;
  right:18px;
  background:var(--strong);
  color:white;
  padding:11px 16px;
  border-radius:999px;
  box-shadow:0 14px 35px rgba(15,23,42,0.9);
  font-size:0.85rem;
  z-index:9999;
  transform:translateX(120%);
  opacity:0;
  transition:all 0.3s ease;
  max-width:320px;
  display:flex;
  align-items:center;
  gap:8px;
}

.toast.show {
  transform:translateX(0);
  opacity:1;
}

.toast.error {
  background:var(--poor);
}

/* Footer */

.site-footer {
  text-align:center;
  padding:18px 12px 22px;
  font-size:0.8rem;
  color:var(--muted);
  border-top:1px solid rgba(15,23,42,0.9);
  background:rgba(2,6,23,0.96);
}

.site-footer a {
  color:#818cf8;
  text-decoration:none;
}

.site-footer a:hover {
  text-decoration:underline;
}

/* Responsive */

@media (max-width:768px) {
  .nav-links {
    display:none;
  }
  .nav-toggle {
    display:flex;
  }
  .mobile-menu.open {
    display:flex;
  }
  .page-heading h1 {
    font-size:1.55rem;
  }
  .card {
    padding:18px 14px 16px;
    border-radius:16px;
  }
}