:root {
  color-scheme: light dark;
  --bg: #0f172a;
  --bg-card: rgba(15, 23, 42, 0.85);
  --bg-body: radial-gradient(circle at top, #1e293b, #0f172a 55%);
  --text-primary: #f8fafc;
  --text-secondary: #cbd5f5;
  --accent: #f97316;
  --accent-soft: rgba(249, 115, 22, 0.16);
  --border: rgba(148, 163, 184, 0.35);
  --shadow: rgba(15, 23, 42, 0.5);
  font-size: 16px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Poppins", system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  background: var(--bg-body);
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.hero {
  background: linear-gradient(135deg, rgba(249, 115, 22, 0.35), transparent);
  padding: 4rem 1.5rem 3rem;
  text-align: center;
}

.hero__content {
  max-width: 680px;
  margin: 0 auto;
}

.hero h1 {
  margin-bottom: 1rem;
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 600;
}

.hero p {
  margin: 0 auto;
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.6;
}

main {
  width: min(1100px, 92vw);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1.5rem;
  padding: 2rem;
  box-shadow: 0 25px 60px -20px var(--shadow);
  backdrop-filter: blur(18px);
}

.card--switcher {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: stretch;
}

.mode-toggle {
  display: inline-flex;
  padding: 0.4rem;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.18);
  border: 1px solid rgba(148, 163, 184, 0.35);
  align-self: center;
  gap: 0.4rem;
}

.mode-toggle__btn {
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 0.6rem 1.2rem;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.mode-toggle__btn:hover {
  transform: translateY(-1px);
}

.mode-toggle__btn.is-active {
  background: var(--accent);
  color: #111827;
}

.mode-hint {
  margin: 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.card h2 {
  margin-top: 0;
  font-size: 1.75rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.field label {
  font-weight: 600;
  color: var(--text-primary);
}

.field__label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.field--full {
  grid-column: 1 / -1;
}

.field__hint {
  margin: 0;
  font-size: 0.85rem;
  color: rgba(226, 232, 240, 0.75);
}

.field__warning {
  margin: 0;
  font-size: 0.85rem;
  color: #fbbf24;
}

.field__warning[hidden] {
  display: none !important;
}

input,
select {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 0.9rem;
  border: 1px solid rgba(148, 163, 184, 0.4);
  background: rgba(15, 23, 42, 0.45);
  color: var(--text-primary);
  font-size: 1rem;
  transition: border 0.2s ease, box-shadow 0.2s ease;
}

input:focus,
select:focus {
  outline: none;
  border-color: rgba(249, 115, 22, 0.6);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

button:focus-visible,
.info-trigger:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.form-actions {
  margin-top: 2.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn {
  padding: 0.9rem 1.8rem;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  letter-spacing: 0.02em;
  background: rgba(148, 163, 184, 0.2);
  color: var(--text-primary);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px -18px rgba(15, 23, 42, 0.8);
}

.btn.primary {
  background: var(--accent);
  color: #111827;
}

.btn.primary:hover {
  box-shadow: 0 18px 35px -15px rgba(249, 115, 22, 0.65);
}

.btn--ghost {
  background: rgba(148, 163, 184, 0.1);
  color: var(--text-secondary);
}

.btn--ghost:hover {
  background: rgba(148, 163, 184, 0.2);
}

.results-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.75rem;
  margin-top: 2rem;
}

.info-trigger {
  border: none;
  background: rgba(148, 163, 184, 0.25);
  color: var(--text-primary);
  border-radius: 999px;
  width: 1.75rem;
  height: 1.75rem;
  font-size: 0.9rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, transform 0.2s ease;
}

.info-trigger:hover {
  background: var(--accent);
  color: #111827;
  transform: translateY(-1px);
}

.info-popover {
  position: relative;
  border-radius: 0.75rem;
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid rgba(148, 163, 184, 0.35);
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  line-height: 1.4;
  color: var(--text-secondary);
  box-shadow: 0 12px 30px -18px var(--shadow);
  margin-top: -0.4rem;
}

.info-popover[hidden] {
  display: none !important;
}

.results-block {
  padding: 1.5rem;
  border-radius: 1.25rem;
  border: 1px solid rgba(148, 163, 184, 0.25);
  background: rgba(15, 23, 42, 0.6);
}

.results-block h3 {
  margin-top: 0;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
}

.result-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.result-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1.5rem;
  padding: 0.6rem 0.8rem;
  border-radius: 0.9rem;
  background: rgba(148, 163, 184, 0.08);
}

.result-list li span:first-child {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.highlight {
  color: var(--accent);
  font-weight: 600;
}

.footer {
  text-align: center;
  padding: 1.5rem;
  color: rgba(226, 232, 240, 0.65);
  font-size: 0.85rem;
  margin-bottom: 2rem;
}

@media (max-width: 640px) {
  body {
    gap: 2.5rem;
  }

  .card {
    padding: 1.5rem;
  }

  .result-list li {
    flex-direction: column;
    align-items: flex-start;
  }
}