/* =========================================================
   iBuddie — shared stylesheet
   Design tokens: cream/off-white paper, black ink, gold accent.
   Used by every page on the site (homepage + interior pages).
   ========================================================= */

:root {
  --paper: #F2EFE7;
  --paper-deep: #ECE7DA;
  --ink: #17140F;
  --ink-soft: #55503F;
  --rule: #DAD4C5;
  --rule-strong: #C7BFAA;
  --gold: #B8860B;
  --gold-deep: #8F6A08;
  --green: #2F6B4A;
  --red: #A6432B;
  --card: #FFFFFF;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--paper);
  color: var(--ink);
  background-image: linear-gradient(var(--rule) 1px, transparent 1px);
  background-size: 100% 40px;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--gold-deep);
  outline-offset: 2px;
}

img { max-width: 100%; display: block; }

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- Nav ---------- */
nav {
  position: sticky; top: 0; z-index: 40;
  background: rgba(242,239,231,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule-strong);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 28px;
  position: relative;
}
.logo {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700; font-size: 22px; letter-spacing: -0.02em;
  text-decoration: none; color: var(--ink);
}
.logo span { color: var(--gold-deep); }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a {
  text-decoration: none; font-size: 14.5px; font-weight: 500; color: var(--ink-soft);
}
.nav-links a:hover, .nav-links a:focus-visible { color: var(--ink); }
.nav-cta {
  background: var(--ink); color: var(--paper) !important;
  padding: 10px 20px; border-radius: 8px; font-weight: 600; font-size: 14px;
  text-decoration: none;
}
.nav-toggle {
  display: none;
  background: none; border: 1px solid var(--rule-strong); border-radius: 8px;
  width: 40px; height: 38px; font-size: 18px; color: var(--ink);
  cursor: pointer; line-height: 1;
}

/* ---------- Hero ---------- */
.hero {
  padding: 32px 0 76px;
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center;
}
.eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12.5px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--gold-deep);
  display: inline-flex; align-items: center; gap: 8px;
  margin-bottom: 22px;
}
.eyebrow::before {
  content: ''; width: 7px; height: 7px; border-radius: 50%; background: var(--green);
}
h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 54px; line-height: 1.06; letter-spacing: -0.02em; font-weight: 700;
  margin-bottom: 22px;
}
h1 em {
  font-style: normal; color: var(--gold-deep);
  background: linear-gradient(transparent 62%, rgba(184,134,11,0.22) 62%);
}
.hero-sub {
  font-size: 17.5px; line-height: 1.6; color: var(--ink-soft); max-width: 480px; margin-bottom: 32px;
}
.hero-ctas { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.btn-primary {
  background: var(--ink); color: var(--paper); text-decoration: none;
  padding: 15px 26px; border-radius: 10px; font-weight: 700; font-size: 15px;
  display: inline-flex; align-items: center; gap: 8px; border: none; cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  font-family: inherit;
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(23,20,15,0.18); }
.btn-ghost {
  text-decoration: none; font-weight: 600; font-size: 14.5px; color: var(--ink-soft);
  border-bottom: 1px solid var(--rule-strong); padding-bottom: 2px;
}

/* ---------- Hero doubt demo (signature element) ---------- */
.demo-card {
  background: var(--card);
  border: 1px solid var(--rule-strong);
  border-radius: 16px;
  box-shadow: 0 24px 60px -20px rgba(23,20,15,0.25);
  overflow: hidden;
}
.demo-tabs {
  display: flex; gap: 4px; padding: 12px 12px 0;
  font-family: 'IBM Plex Mono', monospace;
}
.demo-tab {
  font-size: 11.5px; font-weight: 600; padding: 7px 12px; border-radius: 7px 7px 0 0;
  color: var(--ink-soft); cursor: pointer; background: transparent;
  border: none; letter-spacing: 0.02em; font-family: inherit;
}
.demo-tab.active { background: var(--paper-deep); color: var(--ink); }
.demo-body { padding: 20px 22px 22px; min-height: 240px; }
.demo-question {
  display: inline-block; background: var(--ink); color: var(--paper);
  padding: 11px 16px; border-radius: 14px 14px 4px 14px; font-size: 14px;
  margin-bottom: 16px; max-width: 88%; float: right; clear: both;
}
.demo-answer {
  clear: both; background: var(--paper-deep); border-radius: 4px 14px 14px 14px;
  padding: 14px 16px; font-size: 13.5px; line-height: 1.65; color: var(--ink);
  min-height: 88px;
}
.demo-tag, .tag {
  display: inline-block; font-family: 'IBM Plex Mono', monospace; font-size: 10.5px; font-weight: 600;
  background: rgba(47,107,74,0.12); color: var(--green); padding: 3px 9px; border-radius: 999px;
  margin-bottom: 10px;
}
.demo-cursor { display: inline-block; width: 2px; height: 13px; background: var(--ink); margin-left: 1px; animation: blink 0.9s steps(1) infinite; vertical-align: middle; }
@keyframes blink { 50% { opacity: 0; } }

/* ---------- Section shared ---------- */
section { padding: 76px 0; }
.section-head { max-width: 640px; margin-bottom: 48px; }
.section-label {
  font-family: 'IBM Plex Mono', monospace; font-size: 12px; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--gold-deep); margin-bottom: 12px; display: block;
}
h2 {
  font-family: 'Space Grotesk', sans-serif; font-size: 34px; font-weight: 700; letter-spacing: -0.015em;
  margin-bottom: 12px; line-height: 1.15;
}
h3 { font-family: 'Space Grotesk', sans-serif; font-weight: 700; }
.section-sub { color: var(--ink-soft); font-size: 16px; line-height: 1.6; }
.rule-divider { border: none; border-top: 1px dashed var(--rule-strong); }

/* ---------- Generic grids / cards (reused across sections & pages) ---------- */
.feature-grid, .grid-3, .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.feature-card {
  background: var(--card); border: 1px solid var(--rule-strong); border-radius: 14px; padding: 26px 22px;
}
.feature-icon {
  width: 38px; height: 38px; border-radius: 10px; background: var(--paper-deep);
  display: flex; align-items: center; justify-content: center; margin-bottom: 16px;
  font-size: 18px;
}
.feature-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: 13.5px; color: var(--ink-soft); line-height: 1.55; }

/* ---------- Pricing ---------- */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.price-card {
  background: var(--card); border: 1px solid var(--rule-strong); border-radius: 16px; padding: 30px 26px;
  display: flex; flex-direction: column;
}
.price-card.featured { border: 2px solid var(--ink); position: relative; }
.price-badge {
  position: absolute; top: -13px; left: 26px; background: var(--gold); color: #fff;
  font-family: 'IBM Plex Mono', monospace; font-size: 10.5px; font-weight: 600; padding: 4px 10px; border-radius: 999px;
}
.price-name { font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 19px; margin-bottom: 4px; }
.price-tagline { font-size: 12.5px; color: var(--ink-soft); margin-bottom: 18px; }
.price-amount { font-family: 'Space Grotesk', sans-serif; font-size: 34px; font-weight: 700; margin-bottom: 2px; }
.price-period { font-size: 12.5px; color: var(--ink-soft); margin-bottom: 22px; }
.price-features { list-style: none; margin-bottom: 26px; flex: 1; }
.price-features li { font-size: 13.5px; padding: 6px 0; display: flex; gap: 8px; color: var(--ink-soft); }
.price-features li::before { content: '✓'; color: var(--green); font-weight: 700; }
.price-cta {
  text-align: center; text-decoration: none; padding: 12px 0; border-radius: 9px; font-weight: 700; font-size: 14px;
  background: var(--paper-deep); color: var(--ink);
}
.price-card.featured .price-cta { background: var(--ink); color: var(--paper); }

/* ---------- How it works ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.step-num {
  font-family: 'IBM Plex Mono', monospace; font-size: 12px; font-weight: 600; color: var(--gold-deep);
  margin-bottom: 10px; letter-spacing: 0.04em;
}
.step h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.step p { font-size: 13.5px; color: var(--ink-soft); line-height: 1.6; }

/* ---------- FAQ ---------- */
.faq-item { border-bottom: 1px solid var(--rule-strong); padding: 20px 0; }
.faq-q {
  display: flex; justify-content: space-between; align-items: center; gap: 16px; cursor: pointer;
  font-weight: 600; font-size: 15.5px; background: none; border: none; width: 100%; text-align: left;
  color: var(--ink); font-family: inherit; padding: 0;
}
.faq-plus { font-family: 'IBM Plex Mono', monospace; font-size: 18px; color: var(--gold-deep); transition: transform 0.2s ease; flex-shrink: 0; }
.faq-item.open .faq-plus { transform: rotate(45deg); }
.faq-a {
  max-height: 0; overflow: hidden; transition: max-height 0.25s ease;
  font-size: 14px; color: var(--ink-soft); line-height: 1.6;
}
.faq-item.open .faq-a { max-height: 320px; padding-top: 12px; }

/* ---------- Trust / disclaimer callout ---------- */
.disclaimer-box {
  background: var(--card); border: 1px solid var(--rule-strong); border-left: 3px solid var(--gold-deep);
  border-radius: 10px; padding: 18px 20px; font-size: 13.5px; line-height: 1.6; color: var(--ink-soft);
  max-width: 820px;
}
.disclaimer-box strong { color: var(--ink); }

/* ---------- Interior page header (About / Contact / Legal / Learn) ---------- */
.page-header { padding: 64px 0 40px; max-width: 720px; }
.breadcrumb {
  font-family: 'IBM Plex Mono', monospace; font-size: 12px; color: var(--ink-soft);
  margin-bottom: 18px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap;
}
.breadcrumb a { color: var(--ink-soft); text-decoration: none; }
.breadcrumb a:hover { color: var(--ink); text-decoration: underline; }

/* ---------- Prose (long-form legal / about content) ---------- */
.prose { max-width: 760px; }
.prose h2 { font-size: 24px; margin-top: 40px; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: 17px; margin-top: 26px; margin-bottom: 8px; }
.prose p { font-size: 15px; line-height: 1.75; color: var(--ink-soft); margin-bottom: 14px; }
.prose ul, .prose ol { margin: 0 0 14px 22px; color: var(--ink-soft); font-size: 15px; line-height: 1.75; }
.prose li { margin-bottom: 6px; }
.prose strong { color: var(--ink); }
.prose a { color: var(--gold-deep); text-decoration: underline; }
.prose .meta { font-size: 13px; color: var(--ink-soft); margin-bottom: 32px; font-family: 'IBM Plex Mono', monospace; }

/* ---------- Learn subject grid (homepage + /learn hub) ---------- */
.learn-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.learn-card {
  background: var(--card); border: 1px solid var(--rule-strong); border-radius: 14px; padding: 24px 22px;
  scroll-margin-top: 90px;
}
.learn-card h3 { font-size: 16px; margin-bottom: 4px; }
.learn-card .learn-exams { font-size: 11.5px; color: var(--gold-deep); font-family: 'IBM Plex Mono', monospace; margin-bottom: 14px; display: block; }
.learn-card ul { list-style: none; }
.learn-card li { font-size: 13.5px; padding: 6px 0; border-top: 1px dashed var(--rule); color: var(--ink-soft); }
.learn-card li:first-child { border-top: none; }
.learn-card li a { text-decoration: none; color: var(--ink); font-weight: 500; }
.learn-card li a:hover { color: var(--gold-deep); text-decoration: underline; }
.learn-card li.soon { color: var(--ink-soft); font-style: italic; font-size: 12.5px; }

/* ---------- Article content (learn pages) ---------- */
.article-body { max-width: 760px; }
.article-body h2 { font-size: 24px; margin-top: 40px; margin-bottom: 12px; }
.article-body h2:first-of-type { margin-top: 0; }
.article-body p { font-size: 15px; line-height: 1.75; color: var(--ink-soft); margin-bottom: 14px; }
.article-body ul, .article-body ol { margin: 0 0 14px 22px; color: var(--ink-soft); font-size: 15px; line-height: 1.75; }
.article-body li { margin-bottom: 6px; }
.article-body strong { color: var(--ink); }
.info-box {
  background: var(--card); border: 1px solid var(--rule-strong); border-radius: 10px;
  padding: 18px 20px; margin: 18px 0; font-size: 14px; line-height: 1.7; color: var(--ink-soft);
}
.info-box .info-label {
  font-family: 'IBM Plex Mono', monospace; font-size: 11px; font-weight: 700; letter-spacing: 0.06em;
  text-transform: uppercase; display: block; margin-bottom: 10px;
}
.info-box.formula { border-left: 3px solid var(--gold-deep); }
.info-box.formula .info-label { color: var(--gold-deep); }
.info-box.example { border-left: 3px solid var(--green); }
.info-box.example .info-label { color: var(--green); }
.info-box.mistake { border-left: 3px solid var(--red); }
.info-box.mistake .info-label { color: var(--red); }
.info-box.tip { border-left: 3px solid var(--ink); background: var(--paper-deep); }
.info-box.tip .info-label { color: var(--ink); }
.info-box code, .article-body code {
  font-family: 'IBM Plex Mono', monospace; background: var(--paper-deep); padding: 2px 6px; border-radius: 4px; font-size: 13px; color: var(--ink);
}
.article-cta {
  margin-top: 36px; padding: 24px; background: var(--card); border: 1px solid var(--rule-strong);
  border-radius: 14px; display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
}
.article-cta p { margin: 0; font-size: 14px; color: var(--ink-soft); max-width: 420px; }

/* ---------- Contact page ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.contact-info h3 { font-size: 16px; margin: 22px 0 8px; }
.contact-info h3:first-child { margin-top: 0; }
.contact-info p { font-size: 14px; color: var(--ink-soft); line-height: 1.6; margin-bottom: 6px; }
.contact-info a { color: var(--gold-deep); text-decoration: underline; font-weight: 600; }
.contact-form { background: var(--card); border: 1px solid var(--rule-strong); border-radius: 16px; padding: 28px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--ink); }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 11px 13px; border: 1px solid var(--rule-strong); border-radius: 8px;
  background: var(--paper); font-family: inherit; font-size: 14px; color: var(--ink);
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: 2px solid var(--gold-deep); outline-offset: 1px; border-color: var(--gold-deep);
}
.form-group textarea { resize: vertical; min-height: 110px; }
.form-note { font-size: 12px; color: var(--ink-soft); margin-top: 14px; line-height: 1.6; }

/* ---------- Footer ---------- */
footer { padding: 56px 0 40px; border-top: 1px solid var(--rule-strong); margin-top: 20px; }
.footer-top {
  display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 32px; flex-wrap: wrap; gap: 32px;
}
.footer-tag { font-size: 13.5px; color: var(--ink-soft); max-width: 320px; margin-top: 10px; line-height: 1.6; }
.footer-links { display: flex; gap: 48px; flex-wrap: wrap; }
.footer-col h4 { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 14px; color: var(--ink-soft); }
.footer-col a { display: block; text-decoration: none; font-size: 13.5px; color: var(--ink); margin-bottom: 10px; }
.footer-col a:hover { color: var(--gold-deep); }
.footer-disclaimer {
  font-size: 12px; color: var(--ink-soft); line-height: 1.6; max-width: 760px;
  border-top: 1px dashed var(--rule-strong); padding-top: 18px; margin-bottom: 18px;
}
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center; font-size: 12.5px; color: var(--ink-soft);
  flex-wrap: wrap; gap: 12px;
}

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 40px; }
  .wrap { padding: 0 20px; }
  h1 { font-size: 32px; }
  .hero-sub { font-size: 15px; }
  .eyebrow { font-size: 11px; }
  h2 { font-size: 24px; }
  .section-sub { font-size: 14px; }
  .section-label { font-size: 11px; }
  .feature-grid, .grid-4 { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .grid-3 { grid-template-columns: 1fr; gap: 14px; }
  .feature-card { padding: 18px 16px; }
  .feature-card h3 { font-size: 14px; }
  .feature-card p { font-size: 12.5px; }
  .pricing-grid { grid-template-columns: 1fr; }
  .price-amount { font-size: 28px; }
  .price-name { font-size: 17px; }
  .steps { grid-template-columns: 1fr; }
  .step h3 { font-size: 16px; }
  .step p { font-size: 13px; }
  .demo-question, .demo-answer { font-size: 12.5px; }
  .faq-q { font-size: 14px; }
  .faq-a { font-size: 13px; }
  .btn-primary { font-size: 13.5px; padding: 13px 22px; }
  .btn-ghost { font-size: 13px; }

  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .nav-links {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 2px;
    background: var(--paper); border-bottom: 1px solid var(--rule-strong);
    padding: 10px 20px 16px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 10px 0; width: 100%; }

  .footer-links { gap: 28px; }
  .footer-tag { font-size: 12.5px; }
  .learn-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .contact-grid { grid-template-columns: 1fr; gap: 28px; }
  .page-header { padding: 40px 0 28px; }
  .article-cta { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 560px) {
  .learn-grid { grid-template-columns: 1fr; }
}