/* ==========================================================================
   vibecodingcourse.it — design system
   Concept: the editor/terminal world (structure, git, VS Code) meeting
   the "vibe" — a warm, fluid accent breaking through a disciplined grid.
   ========================================================================== */

:root {
  /* color */
  --ink: #0F1319;
  --ink-2: #0B0E13;
  --surface: #171C24;
  --surface-2: #1E2530;
  --line: rgba(237, 234, 240, 0.10);
  --line-strong: rgba(237, 234, 240, 0.18);
  --text: #ECEAF0;
  --text-dim: #9096A8;
  --text-faint: #7A8094;
  --vibe-1: #FF5D8F;
  --vibe-2: #FF8A3D;
  --code: #4FD1C5;
  --code-dim: #2B7F79;
  --ok: #6BCB77;

  /* type */
  --font-display: 'JetBrains Mono', 'Fira Code', ui-monospace, 'SFMono-Regular', monospace;
  --font-body: 'Golos Text', 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* layout */
  --container: 1120px;
  --radius-s: 8px;
  --radius-m: 14px;
  --radius-l: 22px;
  --gutter: clamp(20px, 5vw, 48px);
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}
body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p { margin: 0; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
:focus-visible {
  outline: 2px solid var(--code);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- background texture ---------- */
body {
  background-image:
    radial-gradient(ellipse 900px 500px at 15% -10%, rgba(255, 93, 143, 0.10), transparent 60%),
    radial-gradient(ellipse 700px 500px at 100% 10%, rgba(79, 209, 197, 0.08), transparent 55%),
    linear-gradient(var(--ink), var(--ink));
  background-attachment: fixed;
}

/* ---------- layout ---------- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); }
.section { padding: clamp(56px, 9vw, 108px) 0; }
.section-head { max-width: 640px; margin: 0 0 44px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--code);
  margin-bottom: 14px;
}
.eyebrow::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--code); box-shadow: 0 0 0 3px rgba(79,209,197,0.18); }

h1, .h1 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.05;
  font-size: clamp(38px, 6vw, 68px);
}
h2, .h2 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.12;
  font-size: clamp(28px, 4vw, 42px);
}
h3, .h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 21px);
  letter-spacing: -0.01em;
}
.lede {
  font-size: clamp(17px, 2vw, 20px);
  color: var(--text-dim);
  max-width: 52ch;
}
.text-dim { color: var(--text-dim); }
.gradient-text {
  background: linear-gradient(90deg, var(--vibe-1), var(--vibe-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 26px;
  border-radius: var(--radius-s);
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 16px;
  white-space: nowrap;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn-primary {
  background: linear-gradient(90deg, var(--vibe-1), var(--vibe-2));
  color: #1A0E12;
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 30px -8px rgba(255, 93, 143, 0.55); }
.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line-strong);
}
.btn-secondary:hover { border-color: var(--code); color: var(--code); }
.btn-block { width: 100%; }

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(15, 19, 25, 0.78);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; padding: 16px var(--gutter); max-width: var(--container); margin: 0 auto; }
.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
}
.brand-dot { width: 8px; height: 8px; border-radius: 50%; background: linear-gradient(90deg, var(--vibe-1), var(--vibe-2)); }
.brand-ext { color: var(--text-faint); }

.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a { font-size: 14.5px; color: var(--text-dim); transition: color 0.15s ease; }
.nav-links a:hover { color: var(--text); }

.lang-switch { display: flex; align-items: center; gap: 2px; font-family: var(--font-display); font-size: 13px; }
.lang-switch a { padding: 5px 8px; border-radius: 6px; color: var(--text-faint); }
.lang-switch a.active { color: var(--ink); background: var(--text); }
.lang-switch a:not(.active):hover { color: var(--text); background: var(--surface-2); }

.nav-cta { display: flex; align-items: center; gap: 18px; }
.nav-toggle { display: none; }

@media (max-width: 860px) {
  .nav-links { display: none; }
  .nav-toggle {
    display: inline-flex; align-items: center; justify-content: center;
    width: 38px; height: 38px; border: 1px solid var(--line-strong); border-radius: 8px;
  }
  .nav-cta .btn-primary { padding: 10px 16px; font-size: 14px; }
}

/* ---------- hero ---------- */
.hero { padding: clamp(56px, 10vw, 100px) 0 clamp(40px, 7vw, 80px); }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(30px, 6vw, 64px); align-items: center; }
@media (max-width: 940px) { .hero-grid { grid-template-columns: 1fr; } }

.hero h1 { margin: 16px 0 20px; }
.hero .lede { margin-bottom: 30px; }
.hero-actions { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; margin-bottom: 22px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 18px; font-family: var(--font-display); font-size: 13px; color: var(--text-dim); }
.hero-meta span { display: inline-flex; align-items: center; gap: 7px; }
.dot-live { width: 7px; height: 7px; border-radius: 50%; background: var(--vibe-1); box-shadow: 0 0 0 3px rgba(255,93,143,0.18); }
.dot-ok { width: 7px; height: 7px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 3px rgba(107,203,119,0.18); }

/* signature visual: prompt -> site */
.rig {
  position: relative;
  padding: 8px;
}
.window {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
  box-shadow: 0 30px 60px -20px rgba(0,0,0,0.6);
}
.window-bar { display: flex; align-items: center; gap: 7px; padding: 11px 14px; border-bottom: 1px solid var(--line); }
.window-bar .wdot { width: 10px; height: 10px; border-radius: 50%; background: var(--surface-2); }
.window-bar .wtitle { margin-left: 8px; font-family: var(--font-display); font-size: 12px; color: var(--text-faint); }

.prompt-body { padding: 22px; }
.prompt-label { font-family: var(--font-display); font-size: 12px; color: var(--text-faint); margin-bottom: 10px; }
.prompt-line { font-family: var(--font-display); font-size: 14.5px; color: var(--text); line-height: 1.6; min-height: 4.8em; }
.prompt-line .caret { display: inline-block; width: 8px; height: 1.1em; background: var(--vibe-2); vertical-align: text-bottom; margin-left: 2px; animation: blink 1s step-end infinite; }
@media (prefers-reduced-motion: reduce) { .prompt-line .caret { animation: none; } }
@keyframes blink { 50% { opacity: 0; } }

.transform-row { display: flex; align-items: center; justify-content: center; gap: 10px; padding: 4px 22px 0; }
.transform-row .arrow { color: var(--text-faint); font-family: var(--font-display); font-size: 13px; }
.transform-row .pulse-line { flex: 1; height: 1px; background: linear-gradient(90deg, transparent, var(--vibe-1), var(--code), transparent); }

.site-preview { padding: 16px 22px 22px; }
.browser-chrome {
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  overflow: hidden;
  background: var(--ink-2);
}
.browser-top { display: flex; align-items: center; gap: 8px; padding: 8px 10px; background: var(--surface-2); border-bottom: 1px solid var(--line); }
.browser-url { flex: 1; background: var(--ink); border-radius: 5px; padding: 4px 10px; font-family: var(--font-display); font-size: 11px; color: var(--text-dim); }
.live-badge { display: inline-flex; align-items: center; gap: 5px; font-family: var(--font-display); font-size: 10px; color: var(--ok); }
.browser-body { padding: 14px; display: grid; gap: 8px; }
.skel { border-radius: 4px; background: var(--surface); }
.skel.nav { height: 12px; width: 40%; }
.skel.hero { height: 46px; background: linear-gradient(120deg, rgba(255,93,143,0.16), rgba(255,138,61,0.10)); border: 1px solid rgba(255,93,143,0.22); }
.skel.row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.skel.card { height: 30px; }

/* ---------- hook ---------- */
.hook-quote {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 27px);
  line-height: 1.5;
  color: var(--text);
  border-left: 2px solid var(--code);
  padding-left: 22px;
  margin: 26px 0;
}
.hook-quote .accent { color: var(--vibe-1); }

/* ---------- curriculum (commit log) ---------- */
.commits { border: 1px solid var(--line); border-radius: var(--radius-m); overflow: hidden; background: var(--surface); }
.commit {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 22px;
  padding: 26px 26px;
  border-bottom: 1px solid var(--line);
}
.commit:last-child { border-bottom: none; }
.commit-tag { font-family: var(--font-display); font-size: 13px; color: var(--code); padding-top: 3px; }
.commit-body h3 { margin-bottom: 8px; }
.commit-body p { color: var(--text-dim); font-size: 15.5px; max-width: 58ch; }
@media (max-width: 640px) { .commit { grid-template-columns: 1fr; gap: 8px; } }

/* ---------- included grid ---------- */
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
@media (max-width: 940px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .grid-4 { grid-template-columns: 1fr; } }
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 24px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover { border-color: var(--line-strong); transform: translateY(-2px); }
.card-icon {
  width: 38px; height: 38px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  background: var(--surface-2); color: var(--code); margin-bottom: 16px;
}
.card h3 { margin-bottom: 8px; font-size: 16.5px; }
.card p { color: var(--text-dim); font-size: 14.5px; }

/* ---------- pricing ---------- */
.pricing-wrap { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 40px; align-items: start; }
@media (max-width: 860px) { .pricing-wrap { grid-template-columns: 1fr; } }
.price-card {
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-l);
  padding: clamp(28px, 4vw, 40px);
  position: relative;
  overflow: hidden;
}
.price-card::before {
  content: "";
  position: absolute; inset: -1px;
  background: linear-gradient(135deg, rgba(255,93,143,0.12), transparent 40%);
  pointer-events: none;
}
.price-row { display: flex; align-items: baseline; gap: 14px; margin: 6px 0 4px; }
.price-now { font-family: var(--font-display); font-size: clamp(44px, 6vw, 58px); font-weight: 800; }
.price-was { font-family: var(--font-display); font-size: 22px; color: var(--text-faint); text-decoration: line-through; }
.price-badge {
  display: inline-block; font-family: var(--font-display); font-size: 11.5px;
  color: var(--ink); background: linear-gradient(90deg, var(--vibe-1), var(--vibe-2));
  padding: 4px 10px; border-radius: 100px; margin-bottom: 14px;
}
.price-note { color: var(--text-dim); font-size: 14px; margin: 10px 0 26px; }
.check-list { display: grid; gap: 12px; margin-bottom: 28px; }
.check-list li { display: flex; gap: 10px; font-size: 15px; color: var(--text); align-items: flex-start; }
.check-list svg { flex-shrink: 0; margin-top: 3px; color: var(--code); }
.price-fine { font-size: 12.5px; color: var(--text-faint); margin-top: 14px; text-align: center; }

.for-you { display: grid; gap: 16px; }
.for-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-m); padding: 22px 24px; }
.for-card h3 { margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.for-card ul { display: grid; gap: 9px; }
.for-card li { font-size: 14.5px; color: var(--text-dim); padding-left: 18px; position: relative; }
.for-card li::before { content: "—"; position: absolute; left: 0; color: var(--text-faint); }

/* ---------- instructor ---------- */
.instructor { display: grid; grid-template-columns: 120px 1fr; gap: 26px; align-items: center; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-l); padding: 30px; }
@media (max-width: 560px) { .instructor { grid-template-columns: 1fr; text-align: center; } .instructor .avatar { margin: 0 auto; } }
.avatar { width: 100px; height: 100px; border-radius: 50%; background: var(--surface-2); border: 1px dashed var(--line-strong); display: flex; align-items: center; justify-content: center; font-family: var(--font-display); font-size: 11px; color: var(--text-faint); text-align: center; padding: 8px; }
.instructor h3 { margin-bottom: 8px; }
.instructor p { color: var(--text-dim); font-size: 15px; }

/* ---------- FAQ ---------- */
.faq-item { border-bottom: 1px solid var(--line); }
.faq-q {
  width: 100%; text-align: left; display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 22px 4px; font-family: var(--font-body); font-weight: 700; font-size: 16.5px;
}
.faq-q .plus { font-family: var(--font-display); color: var(--code); font-size: 20px; transition: transform 0.2s ease; flex-shrink: 0; }
.faq-item[data-open="true"] .plus { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.25s ease; }
.faq-a-inner { padding: 0 4px 22px; color: var(--text-dim); font-size: 15px; max-width: 68ch; }
.faq-item[data-open="true"] .faq-a { max-height: 260px; }

/* ---------- final CTA ---------- */
.final-cta {
  text-align: center;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-l);
  padding: clamp(40px, 7vw, 72px) clamp(20px, 5vw, 40px);
  background: linear-gradient(180deg, var(--surface), var(--ink));
  position: relative;
  overflow: hidden;
}
.final-cta::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(ellipse 600px 300px at 50% 0%, rgba(255,93,143,0.14), transparent 60%);
  pointer-events: none;
}
.final-cta h2 { max-width: 18ch; margin: 0 auto 26px; }
.final-cta .hero-actions { justify-content: center; }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--line); padding: 46px 0; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 24px; justify-content: space-between; align-items: center; }
.footer-links { display: flex; flex-wrap: wrap; gap: 22px; font-size: 13.5px; color: var(--text-faint); }
.footer-links a:hover { color: var(--text-dim); }
.footer-fine { font-size: 12.5px; color: var(--text-faint); margin-top: 22px; }

/* ---------- form (contact) ---------- */
.form-row { display: flex; gap: 12px; flex-wrap: wrap; }
.form-row input {
  flex: 1; min-width: 200px;
  background: var(--surface-2); border: 1px solid var(--line-strong); border-radius: var(--radius-s);
  color: var(--text); padding: 13px 14px; font-family: var(--font-body); font-size: 15px;
}
.form-row input:focus { border-color: var(--code); }
.form-row input::placeholder { color: var(--text-faint); }
.form-note { font-size: 12.5px; color: var(--text-faint); margin-top: 10px; }

/* ---------- reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.5s ease, transform 0.5s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; } }