/* ============ Node Robotics ============ */
:root {
  --navy: #1d4262;
  --navy-deep: #16344d;
  --ink: #24384f;
  --muted: #5b6f82;
  --yellow: #f6c445;
  --yellow-deep: #e3ac1f;
  --sky: #eaf5fd;
  --sky-soft: #f6fbff;
  --periwinkle: #6b83c4;
  --purple: #9b7fd4;
  --mint: #62b892;
  --card-shadow: 0 10px 30px rgba(29, 66, 98, .10);
  --radius: 22px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Nunito', system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: #fff;
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
h1, h2, h3, h4, .btn, .brand-name { font-family: 'Fredoka', 'Nunito', system-ui, sans-serif; }
a { color: var(--navy); }

.container { max-width: 1080px; margin: 0 auto; padding: 0 22px; }
.container-narrow { max-width: 780px; }
.center { text-align: center; }

/* ---------- buttons ---------- */
.btn {
  display: inline-block; text-decoration: none; text-align: center;
  padding: 11px 26px; border-radius: 999px;
  font-weight: 600; font-size: 1rem; line-height: 1.3;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-lg { padding: 15px 32px; font-size: 1.1rem; }
.btn-yellow { background: var(--yellow); color: var(--navy-deep); box-shadow: 0 6px 16px rgba(246, 196, 69, .45); }
.btn-yellow:hover { background: #ffd25e; }
.btn-navy { background: var(--navy); color: #fff; }
.btn-navy:hover { background: var(--navy-deep); }
.btn-outline { border: 2px solid var(--navy); color: var(--navy); background: transparent; }
.btn-outline:hover { background: rgba(29, 66, 98, .06); }
.btn-outline-dark { border: 2px solid rgba(255,255,255,.8); color: #fff; background: transparent; }
.btn-outline-dark:hover { background: rgba(255,255,255,.12); }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.94); backdrop-filter: blur(8px);
  border-bottom: 1px solid #e8f0f7;
}
.nav-row { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding-top: 10px; padding-bottom: 10px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-logo { width: 44px; height: auto; }
.brand-name {
  color: var(--navy); font-weight: 700; font-size: .95rem; line-height: 1.1;
  letter-spacing: .14em; text-transform: uppercase;
}
.nav { display: flex; align-items: center; gap: 26px; }
.nav a { text-decoration: none; color: var(--ink); font-weight: 700; font-size: .98rem; }
.nav a:hover { color: var(--navy); }
.nav .nav-cta { color: var(--navy-deep); }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 24px; height: 3px; background: var(--navy); border-radius: 2px; margin: 5px 0; transition: .2s; }

/* ---------- hero ---------- */
.hero {
  background:
    radial-gradient(600px 300px at 85% 0%, rgba(107, 131, 196, .18), transparent 70%),
    radial-gradient(500px 260px at 10% 100%, rgba(98, 184, 146, .14), transparent 70%),
    linear-gradient(180deg, #e3f2fd 0%, #f3faff 100%);
  padding: 72px 0 64px;
}
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 30px; align-items: center; }
.hero-kicker {
  display: inline-block; background: #fff; border: 2px solid var(--yellow);
  color: var(--navy-deep); font-weight: 800; font-size: .9rem;
  padding: 6px 16px; border-radius: 999px; margin-bottom: 18px;
  box-shadow: 0 4px 12px rgba(29,66,98,.08);
}
.hero h1 {
  font-size: clamp(2.4rem, 5.2vw, 3.6rem); line-height: 1.08;
  color: var(--navy-deep); letter-spacing: .01em;
}
.hero-tagline { font-size: 1.35rem; color: var(--yellow-deep); font-weight: 800; margin: 10px 0 12px; font-family: 'Fredoka', sans-serif; }
.hero-sub { font-size: 1.08rem; color: var(--muted); max-width: 34rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 26px; }
.hero-actions.center { justify-content: center; }
.hero-stats { display: flex; flex-wrap: wrap; gap: 12px; list-style: none; margin-top: 34px; }
.hero-stats li {
  background: #fff; border-radius: 16px; padding: 10px 18px;
  box-shadow: var(--card-shadow); display: flex; flex-direction: column; min-width: 96px;
}
.hero-stats strong { font-family: 'Fredoka', sans-serif; font-size: 1.35rem; color: var(--navy); line-height: 1.2; }
.hero-stats span { font-size: .8rem; color: var(--muted); }
.hero-art { display: flex; justify-content: center; }
.mascot { width: min(300px, 70%); filter: drop-shadow(0 16px 24px rgba(29,66,98,.18)); }

/* ---------- sections ---------- */
.section { padding: 72px 0; }
.section-sky { background: linear-gradient(180deg, #f0f8fe 0%, #e9f4fc 100%); }
.section-kicker {
  font-family: 'Fredoka', sans-serif; font-weight: 600; letter-spacing: .18em;
  text-transform: uppercase; font-size: .8rem; color: var(--yellow-deep);
  margin-bottom: 8px;
}
.section h2 { font-size: clamp(1.7rem, 3.4vw, 2.3rem); color: var(--navy-deep); line-height: 1.15; }
.section-sub { color: var(--muted); font-size: 1.05rem; margin-top: 10px; max-width: 44rem; }
.footnote { font-size: .8rem; color: var(--muted); margin-top: 26px; }

/* ---------- program ---------- */
.dates-card {
  background: #fff; border-radius: var(--radius); padding: 26px 28px;
  box-shadow: var(--card-shadow); margin: 34px 0 26px;
}
.dates-card h3 { color: var(--navy-deep); font-size: 1.15rem; margin-bottom: 14px; }
.date-chips { display: flex; flex-wrap: wrap; gap: 10px; }
.date-chips span {
  background: var(--sky); color: var(--navy); font-weight: 800;
  border: 1.5px solid #cfe6f7; border-radius: 999px; padding: 7px 18px; font-size: .95rem;
}
.dates-note { color: var(--muted); font-size: .9rem; margin-top: 14px; }

.pricing-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.price-card {
  position: relative; background: #fff; border-radius: var(--radius);
  padding: 34px 28px 28px; box-shadow: var(--card-shadow); overflow: hidden;
}
.track-beginner { border-top: 6px solid var(--yellow); }
.track-intermediate { border-top: 6px solid var(--purple); }
.eb-ribbon {
  position: absolute; top: 16px; right: -34px; transform: rotate(38deg);
  background: var(--yellow); color: var(--navy-deep);
  font-size: .72rem; font-weight: 800; padding: 4px 40px; letter-spacing: .02em;
}
.track-intermediate .eb-ribbon { background: #cdb9f0; }
.price-card h3 { font-size: 1.5rem; color: var(--navy-deep); }
.price-card .age { color: var(--muted); font-size: .95rem; margin: 2px 0 14px; }
.price-card .price { font-family: 'Fredoka', sans-serif; font-size: 3rem; font-weight: 700; color: var(--navy); line-height: 1; }
.price-card .price sup { font-size: 1.3rem; top: -1.1em; position: relative; }
.price-card .price-note { color: var(--muted); font-size: .9rem; margin: 6px 0 16px; }
.price-card ul { list-style: none; margin-bottom: 22px; }
.price-card li { padding: 5px 0 5px 26px; position: relative; color: var(--ink); }
.price-card li::before { content: "✓"; position: absolute; left: 0; color: var(--mint); font-weight: 900; }

/* ---------- curriculum ---------- */
.track-title {
  display: flex; align-items: baseline; gap: 12px; margin: 38px 0 18px;
  font-size: 1.3rem; color: #fff; padding: 10px 22px; border-radius: 14px;
  width: fit-content;
}
.track-title small { font-size: .85rem; font-weight: 500; opacity: .92; font-family: 'Nunito', sans-serif; }
.track-title.beginner { background: var(--yellow); color: var(--navy-deep); }
.track-title.intermediate { background: var(--purple); }
.curriculum-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.course-card {
  background: #fff; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--card-shadow); display: flex; flex-direction: column;
  transition: transform .15s ease;
}
.course-card:hover { transform: translateY(-4px); }
.course-card img { width: 100%; height: 150px; object-fit: cover; }
.course-card h4 { color: var(--navy-deep); font-size: 1.15rem; padding: 16px 20px 0; }
.course-card p { padding: 6px 20px 20px; color: var(--muted); font-size: .93rem; }
.course-card p strong { color: var(--navy); }

/* ---------- why us ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 34px; }
.feature-card {
  background: #fff; border-radius: var(--radius); padding: 26px 24px;
  box-shadow: var(--card-shadow);
}
.feature-icon {
  width: 52px; height: 52px; border-radius: 16px; background: var(--sky);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; margin-bottom: 14px; color: var(--navy); font-weight: 800;
}
.feature-card h3 { color: var(--navy-deep); font-size: 1.12rem; margin-bottom: 6px; }
.feature-card p { color: var(--muted); font-size: .95rem; }

/* ---------- instructors ---------- */
.team-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 22px; margin-top: 34px; }
.team-card {
  background: #fff; border: 1.5px solid #e4eef7; border-radius: var(--radius);
  padding: 28px 24px; text-align: center; box-shadow: var(--card-shadow);
}
.avatar {
  width: 68px; height: 68px; border-radius: 50%; margin: 0 auto 14px;
  background: linear-gradient(135deg, var(--navy), var(--periwinkle));
  color: #fff; font-family: 'Fredoka', sans-serif; font-size: 1.7rem; font-weight: 600;
  display: flex; align-items: center; justify-content: center;
}
.team-card h3 { color: var(--navy-deep); font-size: 1.15rem; }
.team-card h3 span { color: var(--muted); font-weight: 500; font-size: .95rem; }
.team-card .cred { color: var(--yellow-deep); font-weight: 800; font-size: .85rem; margin: 4px 0 10px; }
.team-card p:last-child { color: var(--muted); font-size: .92rem; }

/* ---------- FAQ ---------- */
.faq-list { margin-top: 30px; display: grid; gap: 12px; }
.faq-list details {
  background: #fff; border-radius: 16px; box-shadow: var(--card-shadow);
  padding: 4px 22px;
}
.faq-list summary {
  cursor: pointer; font-weight: 800; color: var(--navy-deep);
  padding: 14px 0; list-style: none; position: relative; padding-right: 30px;
  font-size: 1.02rem;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "+"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%);
  font-size: 1.4rem; color: var(--yellow-deep); font-weight: 600; transition: .2s;
}
.faq-list details[open] summary::after { content: "–"; }
.faq-list details p { padding: 0 0 16px; color: var(--muted); }
.faq-list details a { font-weight: 700; }

/* ---------- contact ---------- */
.contact {
  background:
    radial-gradient(500px 280px at 90% 10%, rgba(107, 131, 196, .35), transparent 70%),
    linear-gradient(160deg, var(--navy) 0%, var(--navy-deep) 100%);
  color: #fff; text-align: center;
}
.contact h2 { color: #fff; }
.contact .section-sub { color: #cfe0ee; margin-left: auto; margin-right: auto; }
.contact .section-sub strong { color: var(--yellow); }
.contact .section-kicker { color: var(--yellow); }
.contact-mascot { width: 130px; margin: 0 auto 18px; }
.contact .hero-actions { margin-bottom: 30px; }
.contact-rows { display: grid; gap: 6px; font-size: 1.02rem; }
.contact-rows a { color: #fff; text-decoration: none; border-bottom: 1.5px solid rgba(255,255,255,.35); }
.contact-rows a:hover { border-color: var(--yellow); }

/* ---------- footer ---------- */
.site-footer { background: #10293d; color: #b9cdda; padding: 44px 0 24px; }
.footer-row { display: flex; justify-content: space-between; gap: 30px; flex-wrap: wrap; }
.footer-brand { display: flex; gap: 16px; align-items: center; }
.footer-brand img { width: 58px; background: #fff; border-radius: 50%; padding: 6px; }
.footer-brand p { font-size: .92rem; line-height: 1.5; }
.footer-brand em { color: var(--yellow); font-style: normal; font-weight: 700; }
.footer-brand strong { color: #fff; font-size: 1rem; }
.footer-links { display: flex; flex-direction: column; gap: 8px; }
.footer-links a { color: #b9cdda; text-decoration: none; font-size: .95rem; }
.footer-links a:hover { color: var(--yellow); }
.footer-legal { border-top: 1px solid rgba(255,255,255,.12); margin-top: 30px; padding-top: 18px; }
.footer-legal p { font-size: .85rem; }

/* ---------- responsive ---------- */
@media (max-width: 880px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-copy { display: flex; flex-direction: column; align-items: center; }
  .hero-sub { max-width: 40rem; }
  .hero-art { order: -1; }
  .mascot { width: 150px; }
  .pricing-grid, .curriculum-grid { grid-template-columns: 1fr 1fr; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .nav {
    position: absolute; top: 100%; left: 0; right: 0;
    background: #fff; flex-direction: column; align-items: stretch; gap: 0;
    box-shadow: 0 14px 24px rgba(29,66,98,.12);
    display: none; padding: 8px 22px 16px;
  }
  .nav.open { display: flex; }
  .nav a { padding: 12px 0; border-bottom: 1px solid #eef4f9; }
  .nav .nav-cta { margin-top: 12px; text-align: center; }
  .nav-toggle { display: block; }
  .section { padding: 56px 0; }
  .pricing-grid, .curriculum-grid, .feature-grid { grid-template-columns: 1fr; }
  .hero-stats li { flex: 1 1 40%; }
  .footer-row { flex-direction: column; }
}