:root {
  --accent: #15803d;
  --accent-light: #dcfce7;
  --accent-dark: #166534;
  --bg: #ffffff;
  --bg-alt: #f9fafb;
  --border: #e5e7eb;
  --text: #1f2937;
  --text-muted: #6b7280;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.12);
  --gold: #d97706;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Nav */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--accent);
  box-shadow: var(--shadow-lg);
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 56px;
  flex-wrap: wrap;
}
.logo {
  color: #fff;
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
  margin-right: auto;
  white-space: nowrap;
}
.nav-links {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.nav-links a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  font-size: 0.85rem;
  padding: 6px 10px;
  border-radius: var(--radius);
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}
.nav-links a:hover,
.nav-links a.active {
  background: rgba(255,255,255,0.18);
  color: #fff;
}

/* Layout */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 16px 48px;
  flex: 1;
  width: 100%;
}

h1 {
  font-size: 1.75rem;
  color: var(--accent);
  margin-bottom: 8px;
}
.intro {
  color: var(--text-muted);
  margin-bottom: 24px;
  max-width: 720px;
  line-height: 1.7;
}

/* AdSense */
.adslot {
  min-height: 90px;
  background: #f3f4f6;
  text-align: center;
  padding: 10px;
  margin: 16px 0;
  border-radius: 6px;
  color: #999;
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Calc card */
.calc-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}

/* Forms */
.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}
.calc-grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
}
.form-group input,
.form-group select {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  color: var(--text);
  background: var(--bg);
  transition: border-color 0.15s;
}
.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(21,128,61,0.1);
}
.hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Buttons */
.btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
.btn:hover { background: var(--accent-dark); }
.btn-row {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.btn-secondary {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}
.btn-secondary:hover { background: var(--accent-light); }

/* Results */
.result-box {
  background: var(--accent-light);
  border: 1px solid #86efac;
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-top: 16px;
}
.result-box h2 {
  font-size: 1rem;
  color: var(--accent-dark);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.8rem;
}
.result-main {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-dark);
  line-height: 1.2;
}
.result-main.negative { color: #dc2626; }
.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
  margin-top: 12px;
}
.result-item {
  background: #fff;
  border-radius: 6px;
  padding: 12px;
  border: 1px solid #bbf7d0;
}
.result-item .label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 4px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.result-item .value {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
}
.result-item .value.pos { color: var(--accent-dark); }
.result-item .value.neg { color: #dc2626; }

/* Leg table (parlay) */
.leg-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 16px;
  font-size: 0.9rem;
}
.leg-table th {
  background: var(--bg-alt);
  padding: 8px 10px;
  text-align: left;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}
.leg-table td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
}
.leg-table td input {
  width: 100%;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.9rem;
}
.leg-table td input:focus {
  outline: none;
  border-color: var(--accent);
}
.remove-leg {
  background: none;
  border: none;
  color: #dc2626;
  cursor: pointer;
  font-size: 1rem;
  padding: 2px 6px;
  border-radius: 4px;
}
.remove-leg:hover { background: #fee2e2; }

/* Affiliate banner */
.affiliate-banner {
  background: #fffbeb;
  border: 1px solid #fcd34d;
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 24px 0;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.affiliate-banner .ab-text {
  flex: 1;
  min-width: 200px;
}
.affiliate-banner .ab-text strong {
  display: block;
  margin-bottom: 2px;
  color: var(--text);
}
.affiliate-banner .ab-text span {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.affiliate-banner .ab-btn {
  background: var(--gold);
  color: #fff;
  padding: 10px 20px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
  transition: background 0.15s;
}
.affiliate-banner .ab-btn:hover { background: #b45309; }

/* FAQ */
.faq { margin-top: 32px; }
.faq h2 { font-size: 1.2rem; margin-bottom: 16px; color: var(--text); }
.faq-item { margin-bottom: 16px; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.faq-item summary {
  padding: 14px 16px;
  font-weight: 600;
  cursor: pointer;
  background: var(--bg-alt);
  font-size: 0.95rem;
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before { content: "+ "; color: var(--accent); font-weight: 700; }
details[open] .faq-item summary::before { content: "− "; }
.faq-item p {
  padding: 14px 16px;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  border-top: 1px solid var(--border);
}

/* Footer */
footer {
  background: var(--accent-dark);
  color: rgba(255,255,255,0.7);
  text-align: center;
  padding: 20px 16px;
  font-size: 0.8rem;
}
footer a { color: rgba(255,255,255,0.85); text-decoration: none; }
footer a:hover { text-decoration: underline; }

/* Homepage cards */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 24px;
}
.tool-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-decoration: none;
  color: var(--text);
  display: block;
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.15s;
  box-shadow: var(--shadow);
}
.tool-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.tool-card .icon { font-size: 2rem; margin-bottom: 10px; }
.tool-card h3 { font-size: 1rem; margin-bottom: 6px; color: var(--accent); }
.tool-card p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.5; }

/* Responsive */
@media (max-width: 600px) {
  .calc-grid, .calc-grid-3 { grid-template-columns: 1fr; }
  h1 { font-size: 1.4rem; }
  .result-main { font-size: 1.6rem; }
}