:root {
  --ink: #17324a;
  --ink-soft: #4f6475;
  --paper: #fbf8f2;
  --card: #ffffff;
  --sand: #f1eadd;
  --line: #e2d9c9;
  --accent: #c8532f;
  --accent-dark: #a64022;
  --teal: #1f6f6b;
  --teal-pale: #dcecea;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --radius: 16px;
  --wrap: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 88px; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.6;
}

h1, h2, h3 { font-family: var(--serif); line-height: 1.15; margin: 0; font-weight: 600; }
h1 { font-size: clamp(2.4rem, 5.5vw, 3.7rem); letter-spacing: -0.01em; }
h2 { font-size: clamp(1.9rem, 4vw, 2.6rem); }
h3 { font-size: 1.3rem; }
p { margin: 0; }
a { color: var(--teal); }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

.skip {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--ink);
  color: #fff;
  padding: 8px 14px;
  border-radius: 8px;
  z-index: 30;
}
.skip:focus { left: 12px; }

:focus-visible { outline: 3px solid var(--teal); outline-offset: 2px; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(251, 248, 242, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-row { display: flex; align-items: center; gap: 24px; min-height: 72px; }
.brand {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  margin-right: auto;
}
.main-nav { display: flex; gap: 22px; }
.main-nav a { color: var(--ink); text-decoration: none; font-size: 0.95rem; }
.main-nav a:hover { color: var(--accent); }
.lang { display: inline-block; padding: 11px 4px; font-size: 0.9rem; font-weight: 600; color: var(--ink); }

/* Buttons */
.btn {
  display: inline-block;
  padding: 14px 24px;
  border: 0;
  border-radius: 999px;
  background: var(--accent-dark);
  color: #fff;
  font: 600 1rem var(--sans);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s ease;
}
.btn:hover { background: var(--ink); }
.btn:disabled { opacity: 0.6; cursor: default; }
.btn-small { padding: 10px 18px; font-size: 0.92rem; }
.btn-ghost { background: transparent; color: var(--ink); box-shadow: inset 0 0 0 2px var(--ink); }
.btn-ghost:hover { background: var(--ink); color: #fff; }
.sticky-cta { display: none; }
.nowrap { white-space: nowrap; }

/* Hero */
.hero { padding: 72px 0 64px; }
.hero-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 56px; align-items: center; }
.eyebrow {
  color: var(--teal);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 14px;
}
.lead { font-size: 1.2rem; color: var(--ink-soft); margin: 22px 0 30px; max-width: 34em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }

.chat { display: flex; flex-direction: column; gap: 14px; }
.bubble {
  max-width: 86%;
  padding: 14px 18px;
  border-radius: 18px;
  background: var(--card);
  box-shadow: 0 1px 0 var(--line), 0 8px 24px rgba(23, 50, 74, 0.07);
}
.bubble strong { display: block; font-family: var(--serif); font-size: 1.2rem; font-weight: 600; }
.bubble span { display: block; color: var(--ink-soft); font-size: 0.92rem; }
.bubble.teacher { align-self: flex-start; border-bottom-left-radius: 4px; }
.bubble.student { align-self: flex-end; border-bottom-right-radius: 4px; background: var(--teal-pale); }

/* Facts */
.facts { background: var(--ink); color: #fff; }
.facts-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 30px 0;
  margin: 0;
}
.facts-grid div { display: flex; flex-direction: column-reverse; }
.facts-grid dt { color: #c4d2dc; font-size: 0.92rem; }
.facts-grid dd { margin: 0; font-family: var(--serif); font-size: 1.7rem; font-weight: 600; }

/* Sections */
.section { padding: 80px 0; }
.section.alt { background: var(--sand); }
.section-intro { color: var(--ink-soft); margin-top: 14px; max-width: 38em; }

.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 40px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}
.card p { color: var(--ink-soft); margin-top: 8px; }
.card-link { display: inline-block; margin-top: 4px; padding: 10px 0; font-weight: 600; }

.about { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.about-text p { margin-top: 16px; }
.checks { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.checks li { position: relative; padding-left: 34px; }
.checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.3em;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--teal-pale);
}
.checks li::after {
  content: "";
  position: absolute;
  left: 7px;
  top: calc(0.3em + 5px);
  width: 8px;
  height: 5px;
  border-left: 2px solid var(--teal);
  border-bottom: 2px solid var(--teal);
  transform: rotate(-45deg);
}

.steps {
  list-style: none;
  counter-reset: step;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin: 40px 0 0;
  padding: 0;
}
.steps li { counter-increment: step; }
.steps li::before {
  content: counter(step);
  display: block;
  font-family: var(--serif);
  font-size: 2.6rem;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 10px;
}
.steps p { color: var(--ink-soft); margin-top: 6px; }

/* Pricing */
.prices { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 40px; }
.price { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; }
.price.featured { border: 2px solid var(--teal); }
.amount { font-family: var(--serif); font-size: 3rem; font-weight: 600; margin: 10px 0 2px; line-height: 1.1; }
.amount small { font-family: var(--sans); font-size: 1rem; font-weight: 400; color: var(--ink-soft); }
.price p { color: var(--ink-soft); }
.price-cta { margin-top: 18px; text-align: center; }
.note { color: var(--ink-soft); font-size: 0.95rem; margin-top: 20px; }

/* FAQ */
.faq { margin-top: 32px; max-width: 46em; }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 600; padding: 18px 0; }
.faq details p { color: var(--ink-soft); margin: -8px 0 18px; }

/* Contact */
.contact { display: grid; grid-template-columns: 1fr 1.1fr; gap: 56px; }
.contact-intro p { margin-top: 14px; color: var(--ink-soft); }
.form { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; display: grid; gap: 16px; }
.form label { display: grid; gap: 6px; font-weight: 600; font-size: 0.95rem; }
.form input, .form select, .form textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--ink-soft);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  font: 400 1rem var(--sans);
}
.form .trap { position: absolute; left: -9999px; }
.form-note { margin-top: -6px; font-size: 0.9rem; color: var(--ink-soft); }
.form-status { min-height: 1.5em; font-size: 0.95rem; color: var(--ink-soft); }
.form-status.is-error { color: var(--accent-dark); font-weight: 600; }
.form-status.is-sent { color: var(--ink); font-size: 1rem; }
.form-status:focus { outline: none; }

/* Footer */
.site-footer { background: var(--ink); color: #dbe4ea; padding: 40px 0; font-size: 0.92rem; }
.site-footer a { color: #fff; }
.footer-row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 0 20px; }
.footer-nav a { display: inline-block; padding: 10px 0; }

[hidden] { display: none !important; }

@media (max-width: 860px) {
  body { font-size: 17px; }
  .main-nav { display: none; }
  .hero { padding: 48px 0; }
  .hero-grid, .about, .contact { grid-template-columns: 1fr; gap: 36px; }
  .facts-grid { grid-template-columns: repeat(2, 1fr); }
  .cards, .prices, .steps { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
}

@media (max-width: 560px) {
  .btn-small { display: none; }
  .sticky-cta {
    display: block;
    position: fixed;
    left: 16px;
    right: 16px;
    bottom: 12px;
    z-index: 15;
    text-align: center;
    box-shadow: 0 8px 24px rgba(23, 50, 74, 0.25);
  }
}

@media (max-width: 460px) {
  .wrap { padding: 0 16px; }
  .header-row { gap: 12px; min-height: 56px; }
  .brand { font-size: 1.05rem; }
  .hero { padding: 28px 0 36px; }
  .lead { font-size: 1.05rem; margin: 16px 0 20px; }
  .hero-actions .btn { flex: 1 1 100%; text-align: center; }
  .chat { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}

.section-cta { margin-top: 24px; }
.card:last-child:nth-child(odd) { grid-column: 1 / -1; }
.hero .note { margin-top: 14px; }

@media (max-width: 860px) {
  .card:last-child:nth-child(odd) { grid-column: auto; }
}

.proof { padding: 30px 0; max-width: 46em; }
.section-intro + .checks { margin-top: 24px; max-width: 46em; }

@media (max-width: 460px) {
  .section { padding: 40px 0; }
  .cards, .prices { margin-top: 24px; gap: 14px; }
  .card { padding: 20px; }
  .price { padding: 24px; }
  .steps { margin-top: 24px; gap: 20px; }
}