/* ============================================================
   TOTP Token Generator — Design System
   Dark glassmorphism with gradient accents
   ============================================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Colors */
  --bg-primary: #06060f;
  --bg-secondary: #0c0c1d;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-border: rgba(255, 255, 255, 0.06);
  --bg-input: rgba(255, 255, 255, 0.04);
  --bg-input-focus: rgba(255, 255, 255, 0.07);

  --text-primary: #f0f0f5;
  --text-secondary: rgba(240, 240, 245, 0.55);
  --text-muted: rgba(240, 240, 245, 0.35);

  --accent-start: #6366f1;
  --accent-end: #a855f7;
  --accent-glow: rgba(99, 102, 241, 0.25);

  --success: #22c55e;
  --success-glow: rgba(34, 197, 94, 0.3);

  /* Typography */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Radii */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;

  /* Shadows */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4), 0 0 80px rgba(99, 102, 241, 0.04);
  --shadow-input-focus: 0 0 0 3px var(--accent-glow);
  --shadow-token: 0 0 60px rgba(99, 102, 241, 0.12);

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow-x: hidden;
  position: relative;
}

/* ---------- Background Decorations ---------- */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
}

.bg-glow--1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.12), transparent 70%);
  top: -10%;
  right: -5%;
  animation: float-glow 12s ease-in-out infinite;
}

.bg-glow--2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.08), transparent 70%);
  bottom: -10%;
  left: -5%;
  animation: float-glow 15s ease-in-out infinite reverse;
}

@keyframes float-glow {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(30px, -20px); }
}

/* ---------- Container ---------- */
.container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 520px;
  padding: var(--space-lg);
}

/* ---------- Header ---------- */
.header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.header__icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-sm);
  animation: bounce-in 0.6s var(--ease-out) both;
}

.header__title {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text-primary), var(--accent-start), var(--accent-end));
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradient-shift 6s ease infinite;
}

.header__subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: var(--space-xs);
  font-weight: 400;
}

@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

@keyframes bounce-in {
  0% { transform: scale(0); opacity: 0; }
  60% { transform: scale(1.1); }
  100% { transform: scale(1); opacity: 1; }
}

/* ---------- Card ---------- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-card);
  animation: card-enter 0.5s var(--ease-out) both 0.1s;
}

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

/* ---------- Form ---------- */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.form-group--full {
  grid-column: 1 / -1;
}

.form-label {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.form-label__icon {
  font-size: 0.85rem;
}

.form-input {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  background: var(--bg-input);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  outline: none;
  transition:
    background var(--duration-fast) ease,
    border-color var(--duration-fast) ease,
    box-shadow var(--duration-fast) ease;
  -webkit-appearance: none;
  appearance: none;
}

.form-input--mono {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
}

.form-input:hover {
  border-color: rgba(255, 255, 255, 0.12);
}

.form-input:focus {
  background: var(--bg-input-focus);
  border-color: var(--accent-start);
  box-shadow: var(--shadow-input-focus);
}

.form-input::placeholder {
  color: var(--text-muted);
}

/* Select arrow */
select.form-input {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='rgba(240,240,245,0.4)' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.25rem;
}

/* Number input spinner hide */
.form-input[type="number"]::-webkit-inner-spin-button,
.form-input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.form-input[type="number"] { -moz-appearance: textfield; }

/* ---------- Divider ---------- */
.divider {
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.06) 20%,
    rgba(99, 102, 241, 0.15) 50%,
    rgba(255, 255, 255, 0.06) 80%,
    transparent
  );
  margin: var(--space-lg) 0;
}

/* ---------- Token Section ---------- */
.token-section {
  text-align: center;
}

.countdown {
  margin-bottom: var(--space-sm);
}

.countdown__text {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.countdown__text strong {
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

/* ---------- Progress Bar ---------- */
.progress-bar {
  width: 100%;
  height: 3px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: var(--space-lg);
}

.progress-bar__fill {
  height: 100%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent-start), var(--accent-end));
  transition: width 1s linear;
  position: relative;
}

.progress-bar__fill::after {
  content: '';
  position: absolute;
  right: 0;
  top: -2px;
  width: 8px;
  height: 7px;
  background: var(--accent-end);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--accent-end), 0 0 4px var(--accent-end);
  opacity: 0.8;
}

/* ---------- Token Display ---------- */
.token-display {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  padding: var(--space-lg) var(--space-xl);
  margin-bottom: var(--space-md);
  box-shadow: var(--shadow-token);
  position: relative;
  overflow: hidden;
}

.token-display::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.03), rgba(168, 85, 247, 0.03));
  pointer-events: none;
}

.token-display__value {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--text-primary);
  text-shadow: 0 0 30px rgba(99, 102, 241, 0.2);
  position: relative;
  display: inline-block;
  transition: opacity var(--duration-fast) ease;
}

.token-display__value.is-updating {
  opacity: 0.4;
}

/* ---------- Copy Button ---------- */
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.6rem 1.4rem;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(168, 85, 247, 0.15));
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    background var(--duration-fast) ease,
    border-color var(--duration-fast) ease,
    transform var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) ease;
  outline: none;
}

.copy-btn:hover {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.25), rgba(168, 85, 247, 0.25));
  border-color: rgba(99, 102, 241, 0.35);
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.15);
}

.copy-btn:active {
  transform: scale(0.96);
}

.copy-btn.is-copied {
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.15), rgba(34, 197, 94, 0.2));
  border-color: rgba(34, 197, 94, 0.3);
  color: var(--success);
}

.copy-btn__icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.copy-btn__icon--check {
  color: var(--success);
}

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.6rem 1.2rem;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--success);
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.2);
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  opacity: 0;
  pointer-events: none;
  transition:
    opacity var(--duration-normal) ease,
    transform var(--duration-normal) var(--ease-out);
  z-index: 100;
}

.toast.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---------- Footer ---------- */
.footer {
  text-align: center;
  margin-top: var(--space-xl);
  animation: card-enter 0.5s var(--ease-out) both 0.3s;
}

.footer p {
  font-size: 0.7rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.footer a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--duration-fast) ease;
}

.footer a:hover {
  color: var(--accent-start);
}

/* ---------- Responsive ---------- */
@media (max-width: 540px) {
  .container {
    padding: var(--space-md);
  }

  .card {
    padding: var(--space-lg);
  }

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

  .token-display__value {
    font-size: 2.2rem;
  }

  .header__title {
    font-size: 1.3rem;
  }
}

/* ---------- Utility: reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  .bg-glow { display: none; }
}