/* =================================================================
   CHATGPT ADS — LANDING PAGE STYLES
   Design tokens live at the top under :root. Section styles follow
   in the same order as the sections appear in index.html.
   ================================================================= */

:root {
  /* Color */
  --bg-dark:      #0B0E11;
  --bg-dark-2:    #12161A;
  --bg-light:     #F5F5F1;
  --bg-white:     #FFFFFF;

  --ink:          #14181B;
  --ink-invert:   #F3F2ED;
  --muted:        #5B6462;
  --muted-invert: #9CA6A2;

  --accent:       #17B876;
  --accent-dark:  #0E9463;
  --accent-soft:  #E4F7EE;
  --accent-ink:   #06231A;

  --border-light: rgba(20, 24, 27, 0.10);
  --border-dark:  rgba(255, 255, 255, 0.10);

  /* Type */
  --font-display: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body:    "Inter", "Segoe UI", sans-serif;
  --font-mono:    "IBM Plex Mono", "SFMono-Regular", monospace;

  --h1: clamp(2.1rem, 1.2rem + 4vw, 3.6rem);
  --h2: clamp(1.65rem, 1.15rem + 2vw, 2.35rem);
  --h3: clamp(1.05rem, 0.95rem + 0.4vw, 1.2rem);
  --body: clamp(1rem, 0.95rem + 0.2vw, 1.05rem);

  /* Space */
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --section-pad: clamp(3.25rem, 6vw, 6rem);

  /* Shape */
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --radius-pill: 999px;
}

/* ---------- 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; }
}

body {
  margin: 0;
  background: var(--bg-white);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--font-display); line-height: 1.15; margin: 0; font-weight: 600; letter-spacing: -0.01em; }
h1 { font-size: var(--h1); font-weight: 700; }
h2 { font-size: var(--h2); }
h3 { font-size: var(--h3); }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
svg { display: block; width: 22px; height: 22px; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--narrow { max-width: 760px; }

.section { padding-block: var(--section-pad); }

.section-head {
  max-width: 640px;
  margin-bottom: clamp(2rem, 4vw, 3rem);
}
.section-head h2 { margin-bottom: 0.75rem; }
.section-head p { color: var(--muted); font-size: 1.05rem; }
.section-head--invert p { color: var(--muted-invert); }

.section-cta { margin-top: clamp(2rem, 4vw, 3rem); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.95rem 1.75rem;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--accent);
  color: var(--accent-ink);
  box-shadow: 0 12px 24px -10px rgba(23, 184, 118, 0.55);
}
.btn--primary:hover { background: var(--accent-dark); box-shadow: 0 16px 28px -10px rgba(23, 184, 118, 0.6); }

.btn--ghost {
  background: transparent;
  color: var(--ink-invert);
  border: 1.5px solid var(--border-dark);
}
.btn--ghost:hover { border-color: var(--ink-invert); }

.btn--sm { padding: 0.6rem 1.1rem; font-size: 0.9rem; }
.btn--lg { padding: 1.05rem 2rem; font-size: 1.05rem; }
.btn--block { width: 100%; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(11, 14, 17, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-dark);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 0.9rem;
}
.brand { display: flex; align-items: center; gap: 0.6rem; }
.brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
}
.brand__name { font-family: var(--font-display); font-weight: 600; color: var(--ink-invert); font-size: 1.05rem; }

/* ---------- Hero ---------- */
.hero { position: relative; background: var(--bg-dark); color: var(--ink-invert); overflow: hidden; padding-top: clamp(3rem, 7vw, 5.5rem); padding-bottom: clamp(3.5rem, 7vw, 6rem); }
.hero__bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(560px 360px at 82% 12%, rgba(23, 184, 118, 0.16), transparent 65%),
    radial-gradient(circle, rgba(255,255,255,0.05) 1px, transparent 1.4px);
  background-size: auto, 26px 26px;
  pointer-events: none;
}
.hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border-dark);
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  color: var(--muted-invert);
  margin-bottom: 1.5rem;
}
.typing-dots { display: inline-flex; gap: 3px; }
.typing-dots span {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent);
  animation: typing-bounce 1.2s infinite ease-in-out;
}
.typing-dots span:nth-child(2) { animation-delay: 0.15s; }
.typing-dots span:nth-child(3) { animation-delay: 0.3s; }
@keyframes typing-bounce { 0%, 60%, 100% { opacity: 0.35; transform: translateY(0); } 30% { opacity: 1; transform: translateY(-2px); } }

.hero__title { margin-bottom: 1.1rem; max-width: 15ch; }
.hero__subtitle { color: var(--muted-invert); font-size: 1.1rem; max-width: 46ch; margin-bottom: 1.5rem; }

.hero__points { display: flex; flex-direction: column; gap: 0.55rem; margin-bottom: 2.1rem; }
.hero__points li {
  position: relative;
  padding-left: 1.6rem;
  color: var(--ink-invert);
  font-size: 0.98rem;
}
.hero__points li::before {
  content: "";
  position: absolute; left: 0; top: 0.45em;
  width: 8px; height: 8px;
  border-radius: 2px;
  background: var(--accent);
}

.hero__actions { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-bottom: 1.75rem; }

.hero__price { display: flex; align-items: baseline; gap: 0.65rem; flex-wrap: wrap; }
.hero__price-amount { font-family: var(--font-display); font-size: 1.5rem; font-weight: 700; color: var(--ink-invert); }
.hero__price-note { color: var(--muted-invert); font-size: 0.9rem; }

/* ---------- PDF Mockup ---------- */
.hero__visual { display: flex; justify-content: center; }
.mockup { position: relative; width: min(320px, 80vw); aspect-ratio: 3 / 4; }
.mockup__sheet {
  position: absolute; inset: 0;
  background: var(--bg-dark-2);
  border: 1px solid var(--border-dark);
  border-radius: 4px;
}
.mockup__sheet--3 { transform: rotate(7deg) translate(10px, 6px); opacity: 0.55; }
.mockup__sheet--2 { transform: rotate(3.5deg) translate(5px, 3px); opacity: 0.8; }
.mockup__cover {
  position: absolute; inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: linear-gradient(160deg, #10151A 0%, #0B0E11 60%, #0E1E17 130%);
  border: 1px solid rgba(23, 184, 118, 0.35);
  border-radius: 4px;
  padding: 1.75rem 1.6rem;
  box-shadow: 0 30px 60px -20px rgba(0,0,0,0.65);
}
.mockup__tag {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  border: 1px solid rgba(23, 184, 118, 0.4);
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-pill);
}
.mockup__product { font-family: var(--font-display); font-weight: 700; font-size: 1.4rem; color: var(--ink-invert); letter-spacing: 0.02em; }
.mockup__title { color: var(--muted-invert); font-size: 0.95rem; margin-top: 0.35rem; display: block; }
.mockup__edition { font-family: var(--font-mono); font-size: 0.7rem; color: var(--muted-invert); }

/* ---------- Why Now ---------- */
.why { background: var(--bg-light); }
.why__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; }
.why-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: 0 24px 40px -30px rgba(11,14,17,0.35);
}
.why-card__icon {
  width: 42px; height: 42px;
  display: grid; place-items: center;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  margin-bottom: 1.1rem;
}
.why-card h3 { margin-bottom: 0.5rem; }
.why-card p { color: var(--muted); font-size: 0.96rem; }

/* ---------- What You'll Learn ---------- */
.learn { background: var(--bg-white); }
.learn__list { display: flex; flex-direction: column; }
.learn__step {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 1.5rem;
  padding-block: 1.5rem;
  border-top: 1px solid var(--border-light);
}
.learn__step:last-child { border-bottom: 1px solid var(--border-light); }
.learn__num { font-family: var(--font-mono); color: var(--accent-dark); font-size: 0.95rem; padding-top: 0.15rem; }
.learn__step h3 { margin-bottom: 0.4rem; }
.learn__step p { color: var(--muted); max-width: 60ch; }

/* ---------- Curriculum ---------- */
.curriculum { background: var(--bg-dark); color: var(--ink-invert); }
.curriculum__box {
  background: var(--bg-dark-2);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-lg);
  padding: clamp(1.25rem, 3vw, 2.25rem);
}
.curriculum__list { display: flex; flex-direction: column; }
.curriculum__list li {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-block: 1rem;
  border-top: 1px solid var(--border-dark);
  font-size: 1.02rem;
}
.curriculum__list li:first-child { border-top: none; }
.curriculum__index {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  min-width: 2.6rem;
}
.curriculum__extra { color: var(--muted-invert); }
.curriculum__extra .curriculum__index { color: var(--muted-invert); }

/* ---------- Practical Value ---------- */
.value { background: var(--bg-light); }
.value__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.9rem;
}
.value__grid li {
  position: relative;
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 1rem 1.1rem 1rem 2.6rem;
  font-size: 0.96rem;
  font-weight: 500;
}
.value__grid li::before {
  content: "";
  position: absolute; left: 1.1rem; top: 50%;
  transform: translateY(-50%);
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
}
.value__grid li::after {
  content: "";
  position: absolute; left: 1.32rem; top: 50%;
  width: 8px; height: 4px;
  border-left: 2px solid var(--accent-dark);
  border-bottom: 2px solid var(--accent-dark);
  transform: translateY(-70%) rotate(-45deg);
}

/* ---------- Real World Examples ---------- */
.examples { background: var(--bg-white); }
.examples__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.1rem;
}
.example-card {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}
.example-card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-dark);
  background: var(--accent-soft);
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-pill);
  margin-bottom: 0.75rem;
}
.example-card h3 { margin-bottom: 1rem; font-size: 1.05rem; }
.example-card dl { display: flex; flex-direction: column; gap: 0.4rem; }
.example-card dl div { display: flex; justify-content: space-between; gap: 0.75rem; font-size: 0.88rem; border-top: 1px dashed var(--border-light); padding-top: 0.4rem; }
.example-card dl div:first-child { border-top: none; padding-top: 0; }
.example-card dt { color: var(--muted); }
.example-card dd { margin: 0; font-weight: 600; text-align: right; }

/* ---------- Who This Is For ---------- */
.fit { background: var(--bg-light); }
.fit__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
.fit__col {
  border-radius: var(--radius-md);
  padding: 1.75rem;
  border: 1px solid var(--border-light);
}
.fit__col--yes { background: var(--bg-white); }
.fit__col--no { background: transparent; border-style: dashed; }
.fit__col h3 { margin-bottom: 1.1rem; }
.fit__col ul { display: flex; flex-direction: column; gap: 0.75rem; }
.fit__col li { position: relative; padding-left: 1.6rem; font-size: 0.96rem; color: var(--ink); }
.fit__col--yes li::before { content: "✓"; position: absolute; left: 0; color: var(--accent-dark); font-weight: 700; }
.fit__col--no li { color: var(--muted); }
.fit__col--no li::before { content: "✕"; position: absolute; left: 0; color: var(--muted); }

/* ---------- Urgency ---------- */
.urgency { background: var(--bg-dark); color: var(--ink-invert); text-align: center; }
.urgency__inner { max-width: 700px; display: flex; flex-direction: column; align-items: center; gap: 1.25rem; }
.urgency p { color: var(--muted-invert); font-size: 1.05rem; }
.urgency__line { color: var(--ink-invert); font-weight: 600; font-size: 1.1rem; }

/* ---------- FAQ ---------- */
.faq { background: var(--bg-white); }
.faq__list { display: flex; flex-direction: column; gap: 0.75rem; }
.faq__item {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 1.1rem 1.3rem;
}
.faq__item summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-weight: 600;
  font-size: 1.02rem;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__icon { position: relative; width: 18px; height: 18px; flex-shrink: 0; }
.faq__icon::before, .faq__icon::after {
  content: "";
  position: absolute; background: var(--ink);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
}
.faq__icon::before { width: 12px; height: 2px; }
.faq__icon::after { width: 2px; height: 12px; transition: transform 0.2s ease; }
.faq__item[open] .faq__icon::after { transform: translate(-50%, -50%) rotate(90deg) scale(0); }
.faq__item p { color: var(--muted); margin-top: 0.85rem; font-size: 0.97rem; }

/* ---------- Final CTA ---------- */
.final-cta { background: var(--bg-dark); color: var(--ink-invert); text-align: center; }
.final-cta__inner { max-width: 640px; display: flex; flex-direction: column; align-items: center; gap: 1.1rem; }
.final-cta p { color: var(--muted-invert); font-size: 1.05rem; }
.final-cta__price { display: flex; flex-direction: column; align-items: center; gap: 0.15rem; margin-top: 0.4rem; }
.final-cta__amount { font-family: var(--font-display); font-size: 2.4rem; font-weight: 700; }
.final-cta__price span:last-child { color: var(--muted-invert); font-size: 0.9rem; }
.final-cta__trust {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 1rem;
  color: var(--muted-invert);
  font-size: 0.85rem;
}
.final-cta__trust li { display: flex; align-items: center; gap: 0.5rem; }
.final-cta__trust svg { width: 18px; height: 18px; color: var(--accent); }

/* ---------- Footer ---------- */
.site-footer { background: #08090B; color: var(--muted-invert); padding-block: 2.75rem 3.5rem; }
.site-footer__top { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1.25rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--border-dark); margin-bottom: 1.5rem; }
.site-footer__brand { color: var(--ink-invert); font-weight: 600; }
.site-footer__edition { font-size: 0.85rem; margin-top: 0.25rem; }
.site-footer__links { display: flex; gap: 1.25rem; flex-wrap: wrap; }
.site-footer__links a { font-size: 0.88rem; }
.site-footer__links a:hover { color: var(--ink-invert); }
.site-footer__disclaimer { font-size: 0.82rem; line-height: 1.6; max-width: 70ch; margin-bottom: 1.25rem; }
.site-footer__copy { font-size: 0.8rem; }

/* ---------- Sticky Mobile CTA ---------- */
.sticky-cta {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 50;
  padding: 0.75rem 1rem calc(0.75rem + env(safe-area-inset-bottom));
  background: rgba(11, 14, 17, 0.96);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--border-dark);
  display: none;
  transform: translateY(0);
  transition: transform 0.25s ease;
}
.sticky-cta.is-hidden { transform: translateY(110%); }

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 1.5rem;
  transform: translate(-50%, 20px);
  background: var(--bg-dark-2);
  color: var(--ink-invert);
  border: 1px solid var(--border-dark);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  max-width: min(420px, 88vw);
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 60;
}
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

/* =================================================================
   RESPONSIVE
   ================================================================= */
@media (max-width: 960px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__visual { order: -1; margin-bottom: 0.5rem; }
  .mockup { width: min(260px, 60vw); }
  .why__grid { grid-template-columns: repeat(2, 1fr); }
  .value__grid { grid-template-columns: repeat(2, 1fr); }
  .examples__grid { grid-template-columns: repeat(2, 1fr); }
  .fit__grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .why__grid { grid-template-columns: 1fr; }
  .value__grid { grid-template-columns: 1fr; }
  .examples__grid { grid-template-columns: 1fr; }
  .learn__step { grid-template-columns: 40px 1fr; gap: 1rem; }
  .hero__actions { flex-direction: column; align-items: stretch; }
  .hero__actions .btn { width: 100%; }
  .site-header .btn--sm { padding: 0.55rem 0.9rem; font-size: 0.85rem; }
  .sticky-cta { display: block; }
  body { padding-bottom: 5.5rem; }
  .final-cta__trust { flex-direction: column; gap: 0.6rem; }
}