/* ============================================
   Modern SA ID Generator — Sharp / Flat Design
   ============================================ */

:root {
  --bg: #0e0e10;
  --surface: #18181b;
  --surface-hover: #1f1f23;
  --border: #2a2a2e;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-glow: rgba(99, 102, 241, .35);
  --text: #e4e4e7;
  --text-muted: #a1a1aa;
  --success: #22c55e;
  --danger: #ef4444;
  --font-mono: 'SF Mono', 'Fira Code', 'JetBrains Mono', 'Cascadia Code', monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --transition-fast: 150ms cubic-bezier(.4,0,.2,1);
  --transition-normal: 250ms cubic-bezier(.4,0,.2,1);
  --transition-slow: 400ms cubic-bezier(.4,0,.2,1);
}

/* ---------- Reset & Base ---------- */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Subtle grid background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.02) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 0;
}

/* ---------- Layout ---------- */

.page-wrapper {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 48px 24px 80px;
  gap: 32px;
}

.container {
  width: 100%;
  max-width: 560px;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 40px 36px;
  position: relative;
  animation: fadeSlideUp var(--transition-slow) both;
}

@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Typography ---------- */

h1, .page-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text);
  text-align: center;
  margin-bottom: 8px;
}

.page-subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 32px;
}

h3 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
  text-align: left;
  margin-bottom: 12px;
}

h3.section-title {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 12px;
}

/* ---------- Form Controls ---------- */

.input-group {
  margin-bottom: 20px;
}

.input-group > label:first-child {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

select,
input[type="number"] {
  width: 100%;
  padding: 12px 14px;
  font-size: 0.95rem;
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 0;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
}

select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23a1a1aa' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

select:focus,
input[type="number"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Radio & Checkbox row */
.radio-group,
.checkbox-inline {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.radio-group label,
.checkbox-inline label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.radio-group label:hover,
.checkbox-inline label:hover {
  color: var(--accent-hover);
}

input[type="radio"],
input[type="checkbox"] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

/* ---------- Buttons ---------- */

button,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 14px 20px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: #fff;
  background-color: var(--accent);
  border: none;
  border-radius: 0;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition:
    background-color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

button:hover,
.btn:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow);
}

button:active,
.btn:active {
  transform: translateY(0);
  box-shadow: none;
}

/* Ripple effect */
button::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle, rgba(255,255,255,.25) 10%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

button:active::after {
  opacity: 1;
}

/* Secondary / outline button */
button.btn-secondary {
  background-color: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
}

button.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent-hover);
  background-color: rgba(99, 102, 241, .08);
  box-shadow: none;
  transform: translateY(-1px);
}

/* ---------- Result Display ---------- */

#result {
  margin-top: 16px;
  margin-bottom: 16px;
  padding: 16px 20px;
  background-color: var(--bg);
  border-left: 3px solid var(--accent);
  border-radius: 0;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  min-height: 0;
  transition: all var(--transition-normal);
}

#result:empty {
  padding: 0;
  margin: 0;
  border: none;
}

#result p {
  color: var(--text);
  margin: 0;
  font-size: inherit;
}

#result strong {
  color: var(--accent-hover);
  font-weight: 600;
}

/* Animate result appearing */
#result.show {
  animation: resultPop var(--transition-normal) both;
}

@keyframes resultPop {
  from { opacity: 0; transform: translateX(-8px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ---------- Info Section ---------- */

.info-section {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.info-section h3 {
  font-size: 0.95rem;
  margin-bottom: 12px;
}

.info-section p {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-hover);
  background: var(--bg);
  padding: 10px 14px;
  border: 1px solid var(--border);
  margin-bottom: 16px;
}

ul {
  list-style: none;
  padding: 0;
}

ul li {
  position: relative;
  padding: 6px 0 6px 20px;
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
}

ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background-color: var(--accent);
}

ul li strong {
  color: var(--text);
  font-weight: 600;
}

/* ---------- Navigation link ---------- */

.nav-link {
  display: block;
  text-align: center;
  margin-top: 12px;
}

.nav-link a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color var(--transition-fast);
}

.nav-link a:hover {
  color: var(--accent-hover);
}

/* ---------- Footer ---------- */

.footer {
  text-align: center;
  padding: 24px;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
}

/* ---------- Animations ---------- */

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.fade-in {
  animation: fadeIn var(--transition-slow) both;
}

.stagger-1 { animation-delay: 50ms; }
.stagger-2 { animation-delay: 100ms; }
.stagger-3 { animation-delay: 150ms; }
.stagger-4 { animation-delay: 200ms; }
.stagger-5 { animation-delay: 250ms; }
.stagger-6 { animation-delay: 300ms; }
.stagger-7 { animation-delay: 350ms; }

/* ---------- Responsive ---------- */

@media (max-width: 640px) {
  .container {
    padding: 28px 20px;
  }

  .page-wrapper {
    padding: 24px 16px 60px;
  }

  h1, .page-title {
    font-size: 1.25rem;
  }

  button, .btn {
    padding: 12px 16px;
    font-size: 0.85rem;
  }
}