:root {
  --ink: #1b1f2a;
  --ink-soft: #4a5163;
  --muted: #7a8194;
  --bg: #fbfaf7;
  --bg-alt: #f2efe8;
  --card: #ffffff;
  --line: #e4e0d6;
  --accent: #2f5bea;
  --accent-dark: #2246c4;
  --accent-soft: #e8edfd;
  --warm: #f4b740;
  --dark: #141824;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20, 24, 36, .04), 0 8px 24px rgba(20, 24, 36, .06);
  --serif: "Fraunces", Georgia, serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { line-height: 1.15; margin: 0 0 .5em; }
h1, h2 { font-family: var(--serif); font-weight: 700; letter-spacing: -.01em; }
h1 { font-size: clamp(2.4rem, 5.5vw, 3.8rem); }
h2 { font-size: clamp(1.8rem, 3.6vw, 2.5rem); margin-bottom: 1.2em; }
h3 { font-size: 1.15rem; font-weight: 600; }
p { margin: 0 0 1em; }
a { color: var(--accent); }

.container { width: 100%; max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 760px; }

.eyebrow {
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .8em;
}
.eyebrow.light { color: var(--warm); }

/* Buttons */
.btn {
  display: inline-block;
  padding: .85em 1.5em;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font: 600 1rem var(--sans);
  text-decoration: none;
  border: 2px solid var(--accent);
  cursor: pointer;
  transition: background .15s, transform .15s, border-color .15s;
}
.btn:hover { background: var(--accent-dark); border-color: var(--accent-dark); transform: translateY(-1px); }
.btn:focus-visible { outline: 3px solid var(--warm); outline-offset: 2px; }
.btn-ghost { background: transparent; color: var(--accent); }
.btn-ghost:hover { background: var(--accent-soft); border-color: var(--accent); }
.btn-small { padding: .5em 1.1em; font-size: .9rem; }
.btn-block { display: block; width: 100%; text-align: center; }

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(251, 250, 247, .9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-family: var(--serif); font-weight: 700; font-size: 1.3rem; color: var(--ink); text-decoration: none; }
.logo span { color: var(--accent); }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a:not(.btn) { color: var(--ink-soft); text-decoration: none; font-weight: 500; font-size: .95rem; }
.nav-links a:not(.btn):hover { color: var(--ink); }
.nav-links .btn { color: #fff; }
.nav-toggle { display: none; background: none; border: 0; padding: 8px; cursor: pointer; }
.nav-toggle span { display: block; width: 22px; height: 2px; margin: 5px 0; background: var(--ink); border-radius: 2px; }

/* Hero */
.hero { padding: 80px 0 96px; }
.hero-inner { display: grid; grid-template-columns: 1.15fr 1fr; gap: 56px; align-items: center; }
.hero h1 em { font-style: italic; color: var(--accent); }
.lead { font-size: 1.15rem; color: var(--ink-soft); max-width: 34em; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 24px; }
.hero-points { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px 22px; color: var(--ink-soft); font-size: .95rem; }
.hero-points li::before { content: "✓"; color: var(--accent); font-weight: 700; margin-right: 6px; }

.hero-card { position: relative; }
.board {
  background: var(--dark);
  color: #e8ebf5;
  border-radius: 20px;
  padding: 32px 28px;
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: .95rem;
  box-shadow: 0 30px 60px -20px rgba(20, 24, 36, .45);
  transform: rotate(-1.5deg);
}
.board-line { padding: 4px 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.board-line.muted { color: #9aa3bd; }
.board-line.indent { padding-left: 1.6em; }
.board-line .k { color: var(--warm); }
.board-sep { height: 1px; background: #2c3346; margin: 16px 0; }
.badge-free {
  position: absolute;
  right: -14px;
  bottom: -22px;
  width: 104px;
  height: 104px;
  border-radius: 50%;
  background: var(--warm);
  color: var(--dark);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transform: rotate(10deg);
  box-shadow: var(--shadow);
  line-height: 1.1;
}
.badge-free strong { font-size: 1.35rem; }
.badge-free span { font-size: .78rem; font-weight: 600; }

/* Sections */
.section { padding: 88px 0; }
.section-alt { background: var(--bg-alt); }

/* Subjects */
.tabs { display: inline-flex; background: var(--bg-alt); border-radius: 999px; padding: 4px; margin-bottom: 32px; }
.tab {
  border: 0;
  background: transparent;
  padding: .6em 1.3em;
  border-radius: 999px;
  font: 600 .95rem var(--sans);
  color: var(--ink-soft);
  cursor: pointer;
}
.tab.active { background: var(--card); color: var(--ink); box-shadow: var(--shadow); }
.subject-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.subject-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
}
.subject-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent);
  display: grid;
  place-items: center;
  font: 700 1.3rem var(--serif);
  margin-bottom: 18px;
}
.subject-card ul { padding-left: 1.1em; margin: 0; color: var(--ink-soft); }
.subject-card li { margin-bottom: .5em; }
.subject-card li strong { color: var(--ink); font-weight: 600; }

/* Steps */
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.steps li { background: var(--card); border-radius: var(--radius); padding: 30px; border: 1px solid var(--line); }
.steps p { color: var(--ink-soft); margin: 0; }
.step-num {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  font-weight: 600;
  margin-bottom: 16px;
}

/* Pricing */
.pricing-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 380px)); gap: 24px; justify-content: center; }
.price-card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 36px 32px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}
.price-card.featured { border: 2px solid var(--accent); }
.ribbon {
  position: absolute;
  top: -13px;
  left: 32px;
  background: var(--accent);
  color: #fff;
  font-size: .75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 999px;
}
.price { display: flex; align-items: baseline; gap: 6px; }
.amount { font: 700 3.2rem var(--serif); line-height: 1; }
.per { color: var(--muted); }
.price-note { color: var(--muted); font-size: .95rem; margin: 8px 0 20px; }
.price-card ul { list-style: none; padding: 0; margin: 0 0 28px; flex: 1; }
.price-card li { padding: 8px 0; border-top: 1px solid var(--line); color: var(--ink-soft); }
.price-card li::before { content: "✓"; color: var(--accent); font-weight: 700; margin-right: 10px; }

/* FAQ */
details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0 22px;
  margin-bottom: 12px;
}
summary {
  cursor: pointer;
  font-weight: 600;
  padding: 18px 0;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 16px;
}
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; font-size: 1.4rem; line-height: 1; color: var(--accent); transition: transform .2s; }
details[open] summary::after { transform: rotate(45deg); }
details p { color: var(--ink-soft); padding-bottom: 6px; }

/* Booking */
.book { background: var(--dark); color: #e8ebf5; }
.book h2 { color: #fff; margin-bottom: .6em; }
.book-copy p { color: #b4bbd0; font-size: 1.05rem; }
.book-inner { display: grid; grid-template-columns: 1fr 1.1fr; gap: 56px; align-items: start; }
.book-form {
  background: var(--card);
  color: var(--ink);
  border-radius: 18px;
  padding: 32px;
}
.field { margin-bottom: 18px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: 6px; }
.optional { color: var(--muted); font-weight: 400; }
input, select, textarea {
  width: 100%;
  font: inherit;
  font-size: 1rem;
  padding: .7em .85em;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg);
  color: var(--ink);
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.invalid { border-color: #d64545; }
textarea { resize: vertical; }
.form-status { margin: 14px 0 0; font-size: .95rem; min-height: 1.4em; }
.form-status.error { color: #c53030; }
.form-status.ok { color: #1f7a4d; }

/* Footer */
.footer { padding: 28px 0; font-size: .9rem; color: var(--muted); border-top: 1px solid var(--line); }
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.footer a { color: var(--ink-soft); text-decoration: none; }

/* Responsive */
@media (max-width: 860px) {
  .hero { padding: 48px 0 72px; }
  .hero-inner, .book-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero-card { max-width: 440px; }
  .subject-grid, .steps { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: minmax(0, 420px); }
  .section { padding: 64px 0; }

  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: 8px 20px 20px;
  }
  .nav-links.open { display: flex; }
  .nav-links a:not(.btn) { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .nav-links .btn { margin-top: 14px; text-align: center; }
}

@media (max-width: 480px) {
  body { font-size: 16px; }
  .container { padding: 0 16px; }
  .field-row { grid-template-columns: 1fr; gap: 0; }
  .book-form, .subject-card, .price-card { padding: 24px 20px; }
  .badge-free { width: 86px; height: 86px; right: -4px; }
  .hero-cta .btn { width: 100%; text-align: center; }
}

[hidden] { display: none !important; }
.hero-inner > *, .book-inner > * { min-width: 0; }