:root {
  --void: #05040f;
  --nebula-violet: #8b5cf6;
  --nebula-cyan: #22d3ee;
  --nebula-magenta: #e879f9;

  --primary-gradient: linear-gradient(135deg, #8b5cf6, #22d3ee);

  --glass-bg: rgba(21, 15, 51, 0.5);
  --glass-border: rgba(167, 163, 201, 0.16);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.35);

  --text: #f4f2ff;
  --text-secondary: #a7a3c9;
  --surface: rgba(255, 255, 255, 0.06);
  --surface-solid: #12102a;

  --error: #ff6b81;

  --radius-l: 24px;
  --radius-m: 14px;
}

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

body {
  background:
    radial-gradient(circle at 0% 0%, rgba(139, 92, 246, 0.18) 0%, transparent 45%),
    radial-gradient(circle at 100% 0%, rgba(34, 211, 238, 0.14) 0%, transparent 45%),
    radial-gradient(circle at 100% 100%, rgba(232, 121, 249, 0.1) 0%, transparent 45%),
    var(--void);
  background-attachment: fixed;
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  padding: 24px 16px;
  min-height: 100vh;
  display: flex;
  justify-content: center;
}

.wrap {
  width: 100%;
  max-width: 480px;
}

/* ------------- LOGO ------------- */

.logo {
  display: block;
  font-family: 'Unbounded', sans-serif;
  font-size: 26px;
  font-weight: 700;
  text-align: center;
  margin: 10px 0 16px;
  text-decoration: none;
  letter-spacing: -0.01em;
}

.logo .shiwan { color: var(--nebula-violet); }
.logo .online { color: var(--nebula-cyan); }
.logo:focus-visible { outline: 2px solid var(--nebula-cyan); outline-offset: 4px; border-radius: 6px; }

/* ------------- PAGE TITLE ------------- */

.title {
  text-align: center;
  font-family: 'Unbounded', sans-serif;
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.subtitle {
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 22px;
}

/* ------------- CARD ------------- */

.card {
  background: var(--glass-bg);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-l);
  padding: 26px 22px 22px;
  box-shadow: var(--glass-shadow);
}

/* ------------- BACK BUTTON ------------- */

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  padding: 8px 14px;
  border-radius: 10px;
  transition: 0.2s;
}

.back-btn:hover { background: rgba(255,255,255,0.12); }
.back-btn:focus-visible { outline: 2px solid var(--nebula-cyan); outline-offset: 2px; }

/* ------------- INPUT / SELECT ------------- */

label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text-secondary);
}

select, input {
  width: 100%;
  padding: 12px 14px;
  font-family: inherit;
  font-size: 0.95rem;
  border-radius: var(--radius-m);
  border: 1px solid var(--glass-border);
  background: var(--surface);
  color: var(--text);
  outline: none;
  transition: 0.2s;
}

select { color-scheme: dark; }

select:focus, input:focus {
  background: rgba(255,255,255,0.1);
  border-color: rgba(139,92,246,0.5);
  box-shadow: 0 0 0 3px rgba(139,92,246,0.2);
}

input::placeholder { color: var(--text-secondary); }

.row { margin-bottom: 16px; }

/* ------------- RESULT BOX ------------- */

.result-box {
  margin-top: 10px;
  padding: 14px;
  border-radius: var(--radius-m);
  background: var(--surface-solid);
  border: 1px solid var(--glass-border);
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  min-height: 44px;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--nebula-cyan);
}

.result-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ------------- EXTRA NUMBERS ------------- */

.nums-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 8px;
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-family: 'JetBrains Mono', monospace;
}

.nums-row div span { color: var(--nebula-magenta); }

/* ------------- ERROR TEXT ------------- */

.error {
  color: var(--error);
  font-size: 0.8rem;
  margin-top: 6px;
  min-height: 16px;
}

/* ------------- HINT TEXT ------------- */

.hint {
  margin-top: 16px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ------------- MOBILE ------------- */

@media (max-width: 480px) {
  body { padding: 16px 12px; }
  .card { padding: 20px 16px; }
  .logo { font-size: 22px; }
  .title { font-size: 1.15rem; }
}