@import url('https://fonts.googleapis.com/css2?family=DM+Mono:ital,wght@0,300;0,400;0,500;1,400&family=Syne:wght@400;500;600;700&display=swap');

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

:root {
  --bg:        #080C14;
  --surface:   #0F1420;
  --surface-2: #161C2C;
  --surface-3: #1E2538;
  --border:    rgba(255,255,255,0.07);
  --border-hi: rgba(79,142,247,0.35);
  --accent:    #4F8EF7;
  --accent-dim:#2B5BBF;
  --accent-glow: rgba(79,142,247,0.18);
  --text:      #E8EBF4;
  --text-dim:  #7A82A0;
  --text-faint:#404668;
  --danger:    #EF5350;
  --warn:      #F5A623;
  --good:      #34D399;
  --great:     #60A5FA;
  --radius-sm: 8px;
  --radius:    14px;
  --radius-lg: 20px;
  --font-ui:   'Syne', sans-serif;
  --font-mono: 'DM Mono', monospace;
  --shadow-card: 0 24px 64px rgba(0,0,0,0.55), 0 4px 16px rgba(0,0,0,0.3);
  --shadow-btn:  0 4px 20px rgba(79,142,247,0.3);
}

body {
  font-family: var(--font-ui);
  background: var(--bg);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  color: var(--text);
  /* Subtle grid pattern */
  background-image:
    linear-gradient(rgba(79,142,247,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79,142,247,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
}

.card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 2rem;
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: -60px;
  left: -60px;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(79,142,247,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 1.75rem;
}

.logo-wrap {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  filter: drop-shadow(0 0 8px rgba(79,142,247,0.4));
}

.header-text h1 {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text);
  text-transform: uppercase;
  line-height: 1;
}

.header-text p {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 3px;
  letter-spacing: 0.02em;
  font-family: var(--font-mono);
}

.pg-output {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 0.75rem;
  transition: border-color 0.2s;
}

.pg-output:focus-within,
.pg-output.flash {
  border-color: var(--border-hi);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.pg-password {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 400;
  color: var(--text);
  word-break: break-all;
  flex: 1;
  letter-spacing: 0.06em;
  line-height: 1.45;
  transition: color 0.2s;
  user-select: all;
}

.pg-password.placeholder {
  color: var(--text-faint);
  font-style: italic;
  font-size: 14px;
  letter-spacing: 0.01em;
}

.pg-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.icon-btn {
  background: var(--surface-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 34px;
  height: 34px;
  cursor: pointer;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
  flex-shrink: 0;
}

.icon-btn svg {
  width: 16px;
  height: 16px;
  stroke-width: 2;
}

.icon-btn:hover {
  background: var(--surface-3);
  border-color: var(--border-hi);
  color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.icon-btn:active { transform: scale(0.93); }

.copy-state {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--good);
  font-weight: 500;
  letter-spacing: 0.05em;
  opacity: 0;
  transform: translateY(2px);
  transition: opacity 0.25s, transform 0.25s;
  white-space: nowrap;
}

.copy-state.visible {
  opacity: 1;
  transform: translateY(0);
}

.strength-track {
  display: flex;
  gap: 5px;
  margin-bottom: 5px;
}

.strength-seg {
  height: 3px;
  flex: 1;
  border-radius: 2px;
  background: var(--surface-3);
  transition: background 0.35s ease;
}

.strength-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.strength-label {
  font-size: 11px;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  transition: color 0.35s;
}

.entropy-label {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-faint);
  letter-spacing: 0.02em;
}

.divider {
  height: 1px;
  background: var(--border);
  margin: 1.25rem 0;
}

.ctrl-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 1.25rem;
}

.ctrl-label {
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  min-width: 54px;
  font-weight: 600;
}

.ctrl-row input[type=range] {
  -webkit-appearance: none;
  flex: 1;
  height: 4px;
  border-radius: 2px;
  background: var(--surface-3);
  cursor: pointer;
  outline: none;
  position: relative;
}

.ctrl-row input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 8px rgba(79,142,247,0.5);
  cursor: pointer;
  transition: box-shadow 0.15s, transform 0.15s;
}

.ctrl-row input[type=range]::-webkit-slider-thumb:hover {
  box-shadow: 0 0 14px rgba(79,142,247,0.7);
  transform: scale(1.1);
}

.ctrl-row input[type=range]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  cursor: pointer;
}

.ctrl-val {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  min-width: 28px;
  text-align: right;
}

.section-label {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  font-weight: 600;
  margin-bottom: 10px;
}

.toggle-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
}

.toggle-btn {
  display: flex;
  align-items: center;
  gap: 9px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 11px;
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
  position: relative;
  overflow: hidden;
}

.toggle-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent-glow);
  opacity: 0;
  transition: opacity 0.15s;
}

.toggle-btn:hover::before { opacity: 1; }

.toggle-btn.active {
  border-color: var(--border-hi);
  background: rgba(79,142,247,0.06);
}

.tb-check {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  border: 1.5px solid var(--text-faint);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.15s;
}

.tb-check svg {
  width: 10px;
  height: 10px;
  stroke: var(--bg);
  stroke-width: 2.5;
  opacity: 0;
  transition: opacity 0.15s;
}

.toggle-btn.active .tb-check {
  background: var(--accent);
  border-color: var(--accent);
}

.toggle-btn.active .tb-check svg { opacity: 1; }

.tb-text {
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 0.01em;
  line-height: 1.3;
  position: relative;
  z-index: 1;
}

.toggle-btn.active .tb-text { color: var(--text); }

.gen-btn {
  width: 100%;
  margin-top: 1.25rem;
  padding: 13px;
  font-size: 13px;
  font-weight: 700;
  font-family: var(--font-ui);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border-radius: var(--radius);
  border: 1px solid var(--accent-dim);
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dim) 100%);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  transition: opacity 0.15s, transform 0.1s, box-shadow 0.15s;
  box-shadow: var(--shadow-btn);
  position: relative;
  overflow: hidden;
}

.gen-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15), transparent);
  pointer-events: none;
}

.gen-btn:hover {
  opacity: 0.9;
  box-shadow: 0 6px 28px rgba(79,142,247,0.45);
}

.gen-btn:active { transform: scale(0.975); opacity: 1; }

.gen-btn svg {
  width: 16px;
  height: 16px;
  stroke-width: 2.5;
  flex-shrink: 0;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.spinning { animation: spin 0.45s ease; }

@keyframes flashBorder {
  0%   { border-color: var(--border-hi); box-shadow: 0 0 0 3px var(--accent-glow); }
  100% { border-color: var(--border); box-shadow: none; }
}

.flash { animation: flashBorder 0.6s ease forwards; }