/* gpacalculatorhighschool.com — design system
   Clean & minimal, whitespace-heavy. Single indigo accent. */

:root {
  --accent: #4338ca;          /* deep indigo */
  --accent-soft: #eef0fb;     /* subtle accent tint for result highlight */
  --accent-border: #d7dbf5;
  --bg: #fafafa;
  --card: #ffffff;
  --text: #17181c;
  --text-2: #5b606b;          /* gray-600 secondary */
  --border: rgba(23, 24, 28, 0.12);
  --border-soft: rgba(23, 24, 28, 0.07);
  --radius: 14px;
  --shadow-card: 0 1px 2px rgba(23, 24, 28, 0.04), 0 4px 16px rgba(23, 24, 28, 0.04);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.wrap { max-width: 1060px; margin: 0 auto; padding: 0 20px; }

/* ---------- Header ---------- */
.site-header {
  background: rgba(250, 250, 250, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border-soft);
  position: sticky;
  top: 0;
  z-index: 50;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.logo {
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
  color: var(--text);
}
.logo:hover { text-decoration: none; }
.logo .logo-mark { color: var(--accent); }
.site-nav { display: flex; gap: 26px; }
.site-nav a {
  color: var(--text-2);
  font-size: 0.94rem;
  font-weight: 500;
}
.site-nav a:hover { color: var(--text); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--text); }

/* ---------- Page scaffold ---------- */
.page { padding: 40px 0 72px; }

/* Right rail reserved for a future ad slot (~300px).
   Flip .ad-rail to display:block and set .page-grid at ≥1200px when ads launch. */
.ad-rail { display: none; }

.page-title {
  font-size: clamp(1.65rem, 4vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -0.022em;
  font-weight: 700;
  margin: 0 0 8px;
}
.page-sub {
  color: var(--text-2);
  font-size: 1.02rem;
  max-width: 640px;
  margin: 0 0 28px;
}

/* ---------- Calculator card ---------- */
.calc-card {
  background: var(--card);
  border: 0.5px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 24px;
  max-width: 780px;
}

.calc-toggles {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
}
.seg {
  display: inline-flex;
  background: var(--bg);
  border: 0.5px solid var(--border);
  border-radius: 10px;
  padding: 3px;
}
.seg button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--text-2);
  font: inherit;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 8px;
  cursor: pointer;
}
.seg button[aria-pressed="true"] {
  background: var(--card);
  color: var(--text);
  box-shadow: 0 1px 3px rgba(23, 24, 28, 0.12);
}

.calc-rows { display: flex; flex-direction: column; gap: 10px; margin-bottom: 14px; }

/* ---------- Semester blocks ---------- */
.sem-block {
  border: 0.5px solid var(--border-soft);
  background: var(--bg);
  border-radius: 12px;
  padding: 14px 14px 12px;
  margin-bottom: 12px;
}
.sem-block input[type="text"], .sem-block input[type="number"], .sem-block select {
  background: var(--card);
}
.sem-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}
.sem-title {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0;
}
.sem-meta { display: flex; align-items: center; gap: 8px; }
.gpa-chip {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border: 0.5px solid var(--accent-border);
  border-radius: 999px;
  padding: 3px 10px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.btn-add-course {
  background: transparent;
  border-color: var(--border);
  color: var(--text-2);
  padding: 7px 14px;
  font-size: 0.88rem;
}
.btn-add-sem { display: block; }

/* per-semester breakdown under results */
.breakdown { margin-top: 18px; }
.breakdown h3 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-2);
  margin: 0 0 6px;
}
.breakdown table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}
.breakdown th, .breakdown td {
  text-align: left;
  padding: 7px 10px;
  border-bottom: 1px solid var(--border-soft);
}
.breakdown th {
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-2);
  font-weight: 600;
}

.calc-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 92px 110px 96px 34px;
  gap: 10px;
  align-items: center;
}
.calc-row.no-credits { grid-template-columns: minmax(0, 1fr) 92px 110px 34px; }
.calc-row.no-type { grid-template-columns: minmax(0, 1fr) 92px 96px 34px; }
.calc-row.no-type.no-credits { grid-template-columns: minmax(0, 1fr) 92px 34px; }

.calc-head {
  display: grid;
  gap: 10px;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-2);
  margin-bottom: 8px;
}

input[type="text"], input[type="number"], select {
  width: 100%;
  font: inherit;
  font-size: 0.95rem;
  color: var(--text);
  background: var(--card);
  border: 0.5px solid var(--border);
  border-radius: 9px;
  padding: 9px 10px;
  min-height: 42px;
}
input:focus, select:focus, .seg button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.row-remove {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--text-2);
  font-size: 1.15rem;
  line-height: 1;
  cursor: pointer;
  padding: 8px 4px;
  border-radius: 8px;
}
.row-remove:hover { color: #b3261e; background: rgba(179, 38, 30, 0.06); }

.btn-add {
  appearance: none;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border: 0.5px solid var(--accent-border);
  border-radius: 10px;
  padding: 9px 16px;
  cursor: pointer;
}
.btn-add:hover { filter: brightness(0.98); }

/* prior GPA block (cumulative mode) */
.prior-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding: 14px;
  background: var(--bg);
  border: 0.5px solid var(--border-soft);
  border-radius: 10px;
  margin-bottom: 16px;
}
.prior-block label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-2);
  display: block;
  margin-bottom: 5px;
}

/* ---------- Results ---------- */
.results {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 20px;
}
.results.single { grid-template-columns: 1fr; }
.results.triple { grid-template-columns: repeat(3, 1fr); }
.result-card {
  border: 0.5px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
  background: var(--card);
}
.result-card.primary {
  background: var(--accent-soft);
  border-color: var(--accent-border);
}
.result-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-2);
  margin: 0 0 4px;
}
.result-card.primary .result-label { color: var(--accent); }
.result-value {
  font-size: 2.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  margin: 0;
}
.result-meta { font-size: 0.82rem; color: var(--text-2); margin: 4px 0 0; }

/* ---------- Content sections below calculator ---------- */
.content { max-width: 720px; margin-top: 56px; }
.content h2 {
  font-size: 1.45rem;
  letter-spacing: -0.015em;
  margin: 44px 0 12px;
}
.content h3 { font-size: 1.12rem; margin: 28px 0 8px; }
.content p, .content li { color: #333640; font-size: 1rem; }
.content table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.94rem;
  margin: 16px 0;
}
.content th, .content td {
  text-align: left;
  padding: 9px 12px;
  border-bottom: 1px solid var(--border-soft);
}
.content th {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-2);
}
.table-scroll { overflow-x: auto; }

/* FAQ */
.faq details {
  border-bottom: 1px solid var(--border-soft);
  padding: 4px 0;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  padding: 12px 0;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 12px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--text-2); font-weight: 500; }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: 0 0 14px; }

/* Related links */
.related { margin-top: 56px; max-width: 720px; }
.related h2 { font-size: 1.2rem; margin: 0 0 14px; }
.related ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.related li a { font-weight: 500; }
.related li span { color: var(--text-2); font-size: 0.92rem; display: block; }

/* ---------- Blog ---------- */
.post-list { list-style: none; padding: 0; margin: 24px 0 0; max-width: 720px; display: grid; gap: 6px; }
.post-list li {
  border-bottom: 1px solid var(--border-soft);
  padding: 18px 0;
}
.post-list h2 { font-size: 1.18rem; margin: 0 0 6px; letter-spacing: -0.01em; }
.post-list p { margin: 0; color: var(--text-2); font-size: 0.95rem; }

.article { max-width: 720px; }
.article-meta { color: var(--text-2); font-size: 0.88rem; margin-bottom: 28px; }
.article h1 {
  font-size: clamp(1.7rem, 4vw, 2.2rem);
  line-height: 1.22;
  letter-spacing: -0.022em;
  margin: 0 0 10px;
}
.article h2 { font-size: 1.42rem; letter-spacing: -0.015em; margin: 40px 0 12px; }
.article h3 { font-size: 1.1rem; margin: 26px 0 8px; }
.article p, .article li { color: #333640; }
.article table { border-collapse: collapse; width: 100%; font-size: 0.94rem; margin: 16px 0; }
.article th, .article td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--border-soft); }
.article th { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-2); }
.callout {
  background: var(--accent-soft);
  border: 0.5px solid var(--accent-border);
  border-radius: 12px;
  padding: 16px 18px;
  margin: 24px 0;
}
.callout p { margin: 0; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border-soft);
  margin-top: 40px;
  padding: 40px 0 48px;
  font-size: 0.9rem;
  color: var(--text-2);
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 28px;
  margin-bottom: 28px;
}
.footer-cols h3 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-2);
  margin: 0 0 10px;
}
.footer-cols ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 7px; }
.footer-cols a { color: var(--text-2); }
.footer-cols a:hover { color: var(--text); }
.footer-note { font-size: 0.84rem; }

/* ---------- Mobile ---------- */
@media (max-width: 640px) {
  .calc-card { padding: 16px; }
  .calc-head { display: none; }
  .calc-row, .calc-row.no-credits, .calc-row.no-type, .calc-row.no-type.no-credits {
    grid-template-columns: 1fr 1fr;
    border-bottom: 1px solid var(--border-soft);
    padding-bottom: 12px;
  }
  .calc-row .cell-name { grid-column: 1 / -1; }
  .calc-row .row-remove { justify-self: end; }
  .results, .results.triple { grid-template-columns: 1fr; }
  .prior-block { grid-template-columns: 1fr; }
  .site-nav { gap: 18px; }
  .sem-block { padding: 12px 10px 10px; }
  .sem-head { flex-wrap: wrap; }
}

@media (max-width: 480px) {
  .logo > span:not(.logo-mark) { display: none; }
}