/* ── Reset & base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #0d1117;
  --surface:   #161b22;
  --border:    #21262d;
  --accent:    #3b82f6;
  --accent-h:  #2563eb;
  --text:      #e6edf3;
  --muted:     #8b949e;
  --radius:    10px;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
}

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

/* ── Header ── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(8px);
  z-index: 100;
}

.logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.5px;
}

nav { display: flex; gap: 1.75rem; }
nav a { color: var(--muted); font-size: 0.9rem; }
nav a:hover { color: var(--text); text-decoration: none; }

/* ── Hero ── */
.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
  padding: 6rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

.hero-content { max-width: 560px; }

h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 1.25rem;
}

.subtitle {
  color: var(--muted);
  font-size: 1.05rem;
  margin-bottom: 2rem;
  line-height: 1.7;
}

.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-primary:hover { background: var(--accent-h); text-decoration: none; }

.btn-secondary {
  display: inline-block;
  background: transparent;
  color: var(--accent);
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9rem;
  border: 1.5px solid var(--accent);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.btn-secondary:hover { background: var(--accent); color: #fff; }

.hero-graphic {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  flex-shrink: 0;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 2rem;
  text-align: center;
  min-width: 150px;
}

.stat-num {
  display: block;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent);
}

.stat-label {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.25rem;
}

/* ── Sections ── */
section {
  padding: 5rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

section + section {
  border-top: 1px solid var(--border);
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 0.6rem;
  letter-spacing: -0.5px;
}

.section-sub {
  color: var(--muted);
  margin-bottom: 2.5rem;
  font-size: 0.95rem;
}

/* ── How it works ── */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.step-num {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.step h3 { font-size: 1rem; margin-bottom: 0.5rem; }
.step p  { color: var(--muted); font-size: 0.9rem; }

/* ── Predictor form ── */
.predictor-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 2rem;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

legend {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--accent);
  padding: 0 0.5rem;
}

.form-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-top: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  flex: 1;
  min-width: 180px;
}

label {
  font-size: 0.85rem;
  color: var(--muted);
}

.optional {
  font-size: 0.75rem;
  color: var(--muted);
}

input[type="text"],
input[type="number"],
input[type="email"],
select {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 0.55rem 0.75rem;
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s;
  width: 100%;
}

input:focus, select:focus {
  border-color: var(--accent);
}

select option { background: var(--bg); }

.predictor-form .btn-primary {
  align-self: flex-start;
  margin-top: 0.5rem;
}

/* ── Results placeholder ── */
.results-placeholder {
  margin-top: 2.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
}

.results-placeholder h3 { margin-bottom: 0.5rem; }
.results-placeholder p  { color: var(--muted); font-size: 0.9rem; margin-bottom: 1.25rem; }

.email-form {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

.email-form input[type="email"] {
  max-width: 280px;
}

/* ── Schools grid ── */
.school-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1rem;
}

.school-tag {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 0.35rem 0.9rem;
  font-size: 0.85rem;
  color: var(--text);
}

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  padding: 3rem 2rem;
  text-align: center;
  color: var(--muted);
}

.footer-inner { max-width: 600px; margin: 0 auto; }
.footer-brand { font-size: 1.1rem; font-weight: 700; color: var(--text); margin-bottom: 0.5rem; }
footer p { font-size: 0.85rem; margin-bottom: 0.25rem; }
.small { font-size: 0.75rem; }

/* ── Responsive ── */
@media (max-width: 700px) {
  .hero { flex-direction: column; padding: 3rem 1.25rem; }
  .hero-graphic { flex-direction: row; flex-wrap: wrap; justify-content: center; }
  nav { gap: 1rem; }
  header { padding: 1rem 1.25rem; }
  section { padding: 3rem 1.25rem; }
}