/* GPACalcPro.com shared stylesheet */
:root {
  --accent: #1d4ed8;
  --accent-dark: #1e40af;
  --accent-light: #dbeafe;
  --bg: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --soft: #f9fafb;
  --soft-2: #f3f4f6;
  --success: #16a34a;
  --warn: #d97706;
  --danger: #dc2626;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 2px rgba(0,0,0,0.03);
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 18px;
  padding: 12px 20px;
}
.brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--accent);
  margin-right: auto;
  letter-spacing: -0.01em;
}
.brand span { color: var(--text); }
.nav a.navlink {
  color: var(--text);
  font-size: 0.92rem;
  padding: 6px 10px;
  border-radius: 6px;
  text-decoration: none;
}
.nav a.navlink:hover {
  background: var(--accent-light);
  color: var(--accent-dark);
}
.nav a.navlink.active {
  background: var(--accent);
  color: #ffffff;
}

/* Layout */
main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px 48px;
}

h1 {
  font-size: 2rem;
  margin: 16px 0 8px;
  letter-spacing: -0.015em;
  color: var(--text);
}
h2 {
  font-size: 1.35rem;
  margin: 32px 0 10px;
  color: var(--text);
}
h3 {
  font-size: 1.05rem;
  margin: 20px 0 8px;
}

.lede {
  color: var(--muted);
  font-size: 1.02rem;
  margin: 0 0 8px;
  max-width: 760px;
}

/* Cards */
.card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin: 16px 0;
}
.card h2:first-child, .card h3:first-child { margin-top: 0; }

.callout {
  background: var(--accent-light);
  border-left: 4px solid var(--accent);
  border-radius: 6px;
  padding: 14px 16px;
  margin: 16px 0;
  color: #1e3a8a;
  font-size: 0.95rem;
}
.callout strong { color: var(--accent-dark); }

/* Form elements */
label {
  display: block;
  font-size: 0.88rem;
  color: var(--muted);
  margin-bottom: 4px;
  font-weight: 500;
}

input[type="text"],
input[type="number"],
select {
  width: 100%;
  padding: 9px 11px;
  font-size: 0.97rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #ffffff;
  font-family: inherit;
  color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus, select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.15);
}

button {
  background: var(--accent);
  color: #ffffff;
  border: none;
  padding: 9px 18px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s;
}
button:hover { background: var(--accent-dark); }
button.secondary {
  background: #ffffff;
  color: var(--accent);
  border: 1px solid var(--accent);
}
button.secondary:hover { background: var(--accent-light); }
button.ghost {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--border);
  padding: 6px 10px;
  font-size: 0.85rem;
}
button.ghost:hover { background: #fef2f2; border-color: var(--danger); }

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 14px 0 6px;
}

/* Course/row grid */
.row-grid {
  display: grid;
  gap: 10px;
  align-items: end;
  margin-bottom: 10px;
}
.row-grid.cols-4 { grid-template-columns: 2fr 1fr 1fr auto; }
.row-grid.cols-5 { grid-template-columns: 2fr 1fr 1fr 1fr auto; }
.row-grid.cols-6 { grid-template-columns: 2fr 1fr 1fr 1fr 1fr auto; }

@media (max-width: 720px) {
  .row-grid.cols-4,
  .row-grid.cols-5,
  .row-grid.cols-6 {
    grid-template-columns: 1fr 1fr;
  }
  .row-grid > .remove-cell {
    grid-column: 1 / -1;
    text-align: right;
  }
}

.header-row {
  font-size: 0.82rem;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 10px;
}
@media (max-width: 720px) {
  .header-row { display: none; }
}

/* Results */
.results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 14px;
  margin-top: 8px;
}
.result-box {
  background: var(--soft);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
}
.result-box .label {
  font-size: 0.78rem;
  text-transform: uppercase;
  color: var(--muted);
  letter-spacing: 0.05em;
  font-weight: 600;
}
.result-box .value {
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--accent);
  margin-top: 4px;
  line-height: 1.1;
}
.result-box.alt .value { color: var(--text); }

/* Tables */
table.scale {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0;
  font-size: 0.95rem;
}
table.scale th, table.scale td {
  text-align: left;
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
}
table.scale th {
  background: var(--soft-2);
  font-weight: 600;
  color: var(--text);
}
table.scale tr:hover td { background: var(--soft); }

/* Footer */
footer {
  margin-top: 50px;
  border-top: 1px solid var(--border);
  background: var(--soft);
  padding: 28px 20px 32px;
  font-size: 0.88rem;
  color: var(--muted);
}
footer .inner {
  max-width: 1100px;
  margin: 0 auto;
}
footer .links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  margin: 8px 0 14px;
}
footer .links a { color: var(--accent); }
footer .disclaimer { margin-top: 8px; font-size: 0.82rem; }

/* Ad slot already inline-styled, but ensure responsive */
.adslot { width: 100%; }

.remove-cell { display: flex; align-items: end; }

.muted { color: var(--muted); font-size: 0.9rem; }

.divider {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 28px 0;
}