:root {
  --bg: #0b0f1a;
  --bg-elevated: #131a2a;
  --bg-card: #1a2338;
  --border: #2a344d;
  --text: #e8ecf5;
  --text-muted: #9aa5bd;
  --accent: #2f7dfa;
  --accent-hover: #4c8dfb;
  --accent-soft: rgba(47, 125, 250, 0.14);
  font-size: 16px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 16px 48px;
}

/* ---- Header ---- */

.site-header {
  text-align: center;
  padding: 40px 16px 28px;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.logo-mark {
  width: 28px;
  height: 28px;
  color: var(--accent);
}

.wordmark-text {
  font-size: 1.6rem;
  letter-spacing: -0.02em;
  color: var(--text);
}

.wordmark-text strong {
  color: var(--accent);
  font-weight: 700;
}

.tagline {
  margin: 10px 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ---- Category nav ---- */

.category-nav {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin: 0 0 20px;
}

.category-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 18px 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 14px;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.category-btn svg {
  width: 26px;
  height: 26px;
}

.category-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.category-btn.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-hover);
}

/* ---- Search form ---- */

.search-panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
}

.search-form {
  display: none;
  flex-direction: column;
  gap: 14px;
}

.search-form.active {
  display: flex;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

label.full-width {
  grid-column: 1 / -1;
}

label.checkbox-field {
  flex-direction: row;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
}

input[type="text"],
input[type="date"],
input[type="number"],
select {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--text);
  font-size: 0.95rem;
  font-family: inherit;
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
}

input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

input:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.submit-btn {
  margin-top: 6px;
  padding: 13px 20px;
  background: var(--accent);
  border: none;
  border-radius: 10px;
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease;
}

.submit-btn:hover {
  background: var(--accent-hover);
}

/* ---- How it works ---- */

.how-it-works {
  margin-top: 36px;
  text-align: center;
}

.how-it-works h2 {
  font-size: 1.3rem;
  margin: 0 0 8px;
}

.how-it-works-note {
  color: var(--text-muted);
  font-size: 0.9rem;
  max-width: 560px;
  margin: 0 auto 24px;
  line-height: 1.5;
}

.feature-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.feature-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  text-align: left;
}

.feature-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-hover);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card h3 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.feature-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.45;
}

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

.site-footer {
  text-align: center;
  padding: 24px 16px 40px;
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* ---- Desktop (>=900px) ---- */

@media (min-width: 900px) {
  .category-nav {
    grid-template-columns: repeat(4, 1fr);
  }

  .field-row {
    grid-template-columns: 1fr 1fr;
  }

  .feature-row {
    grid-template-columns: repeat(4, 1fr);
  }

  .search-panel {
    padding: 28px;
  }
}