:root {
  --gptb-teal: #138f92;
  --gptb-teal-dark: #08666a;
  --gptb-purple: #6547c7;
  --gptb-purple-dark: #493195;
  --gptb-mist: #e8f7f5;
  --gptb-lavender: #f0ecfc;
  --gptb-paper: #fffefc;
  --gptb-cloud: #f4f5f7;
  --gptb-ink: #172033;
  --gptb-slate: #596273;
  --gptb-gold: #d8953e;
  --gptb-border: #dfe3e8;
  --gptb-success: #237a57;
  --gptb-error: #b42318;
  --gptb-radius: 18px;
  --gptb-shadow: 0 16px 42px rgba(23, 32, 51, 0.09);
}

.gptb-bookshop, .gptb-section, .gptb-calculator, .gptb-library { color: var(--gptb-ink); font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; font-size: 17px; line-height: 1.65; }
.gptb-bookshop *, .gptb-section *, .gptb-calculator *, .gptb-library * { box-sizing: border-box; }
.gptb-bookshop h1, .gptb-bookshop h2, .gptb-bookshop h3, .gptb-section h1, .gptb-section h2, .gptb-section h3, .gptb-calculator h1, .gptb-calculator h2, .gptb-library h2, .gptb-library h3 { color: var(--gptb-ink); font-family: "Plus Jakarta Sans", Inter, system-ui, sans-serif; letter-spacing: -0.03em; line-height: 1.15; margin-top: 0; }
.gptb-hero { background: linear-gradient(135deg, var(--gptb-paper), var(--gptb-lavender)); border: 1px solid #e4def8; border-radius: 28px; margin: 0 auto 72px; max-width: 1240px; overflow: hidden; padding: clamp(48px, 8vw, 96px); position: relative; }
.gptb-hero::after { background: linear-gradient(135deg, rgba(19,143,146,.12), rgba(101,71,199,.12)); border-radius: 999px; content: ""; height: 280px; position: absolute; right: -80px; top: -90px; width: 280px; }
.gptb-hero > * { max-width: 800px; position: relative; z-index: 1; }
.gptb-hero h1 { font-size: clamp(2.5rem, 6vw, 4.25rem); margin-bottom: 20px; }
.gptb-lead { color: var(--gptb-slate); font-size: clamp(1.08rem, 2vw, 1.28rem); max-width: 720px; }
.gptb-eyebrow { color: var(--gptb-purple-dark); font-size: .78rem; font-weight: 800; letter-spacing: .13em; margin-bottom: 12px; text-transform: uppercase; }
.gptb-section { margin: 0 auto; max-width: 1240px; padding: 72px 24px; }
.gptb-section-heading { margin-bottom: 38px; max-width: 760px; }
.gptb-section-heading h2 { font-size: clamp(2rem, 4vw, 3rem); }
.gptb-grid { display: grid; gap: 24px; }
.gptb-grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.gptb-grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.gptb-grid-4, .gptb-book-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.gptb-path-card, .gptb-category-card, .gptb-book-card, .gptb-calculator-card { background: #fff; border: 1px solid var(--gptb-border); border-radius: var(--gptb-radius); padding: 28px; position: relative; transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease; }
.gptb-path-card:hover, .gptb-category-card:hover, .gptb-book-card:hover, .gptb-calculator-card:hover { border-color: #c8bdf0; box-shadow: var(--gptb-shadow); transform: translateY(-4px); }
.gptb-card-teal { background: var(--gptb-mist); border-color: #bfe7e2; }
.gptb-card-purple { background: var(--gptb-lavender); border-color: #d8cff5; }
.gptb-step { color: var(--gptb-gold); display: block; font-size: 2rem; font-weight: 800; margin-bottom: 28px; }
.gptb-button, a.gptb-button { align-items: center; background: var(--gptb-teal); border: 2px solid var(--gptb-teal); border-radius: 10px; color: #fff !important; display: inline-flex; font-weight: 750; justify-content: center; line-height: 1.2; min-height: 50px; padding: 13px 22px; text-decoration: none !important; transition: background .2s ease, border-color .2s ease, transform .2s ease; }
.gptb-button:hover, .gptb-button:focus-visible { background: var(--gptb-teal-dark); border-color: var(--gptb-teal-dark); transform: translateY(-1px); }
.gptb-button-purple, a.gptb-button-purple { background: var(--gptb-purple); border-color: var(--gptb-purple); }
.gptb-button-purple:hover, .gptb-button-purple:focus-visible { background: var(--gptb-purple-dark); border-color: var(--gptb-purple-dark); }
.gptb-button-outline, a.gptb-button-outline { background: #fff; border-color: var(--gptb-purple); color: var(--gptb-purple-dark) !important; }
.gptb-actions, .gptb-result-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 28px; }
.gptb-category-card { border-top: 6px solid var(--gptb-teal); }
.gptb-category-prompts-content { border-top-color: var(--gptb-purple); }
.gptb-category-traffic-sales { border-top-color: var(--gptb-purple-dark); }
.gptb-category-systems-assistants { border-top-color: var(--gptb-ink); }
.gptb-soft-section { background: var(--gptb-cloud); border-radius: 28px; }
.gptb-book-card { display: flex; flex-direction: column; padding: 18px; }
.gptb-cover-link { aspect-ratio: 1 / 1.6; background: linear-gradient(145deg, var(--gptb-mist), var(--gptb-lavender)); border-radius: 10px; display: block; margin-bottom: 18px; overflow: hidden; }
.gptb-cover { height: 100% !important; object-fit: cover; width: 100% !important; }
.gptb-book-card h3 { font-size: 1.18rem; margin: 10px 0; }
.gptb-book-card h3 a { color: var(--gptb-ink); text-decoration: none; }
.gptb-book-card p { color: var(--gptb-slate); font-size: .95rem; }
.gptb-badge { align-self: flex-start; background: var(--gptb-lavender); border-radius: 99px; color: var(--gptb-purple-dark); font-size: .74rem; font-weight: 800; padding: 5px 10px; text-transform: uppercase; }
.gptb-card-footer { align-items: center; display: flex; gap: 12px; justify-content: space-between; margin-top: auto; padding-top: 14px; }
.gptb-price { font-size: 1.08rem; font-weight: 800; }
.gptb-text-link { color: var(--gptb-purple-dark); font-weight: 750; }
.gptb-calculator-callout { align-items: center; background: linear-gradient(125deg, var(--gptb-ink), var(--gptb-purple-dark)); border-radius: 24px; color: #fff; display: flex; justify-content: space-between; margin-top: 72px; padding: 48px; }
.gptb-calculator-callout h2, .gptb-calculator-callout .gptb-eyebrow { color: #fff; }
.gptb-calculator-callout > div { max-width: 720px; }
.gptb-calculator { margin: 0 auto; max-width: 960px; padding: 48px 24px; }
.gptb-calculator-intro { margin-bottom: 36px; }
.gptb-calculator-intro h1 { font-size: clamp(2.3rem, 6vw, 4rem); }
.gptb-trust-inline { color: var(--gptb-teal-dark); font-weight: 700; }
.gptb-calculator-form { background: #fff; border: 1px solid var(--gptb-border); border-radius: 24px; box-shadow: var(--gptb-shadow); display: grid; gap: 22px; padding: clamp(24px, 5vw, 48px); }
.gptb-field label { display: block; font-weight: 750; margin-bottom: 8px; }
.gptb-field label span, .gptb-field small { color: var(--gptb-slate); font-weight: 500; }
.gptb-field input { border: 2px solid #b9c0ca; border-radius: 9px; color: var(--gptb-ink); font-size: 1.05rem; min-height: 50px; padding: 10px 14px; width: 100%; }
.gptb-field input:focus { border-color: var(--gptb-teal); box-shadow: 0 0 0 3px rgba(19,143,146,.18); outline: none; }
.gptb-input-wrap { align-items: center; display: flex; position: relative; }
.gptb-input-wrap > span { font-weight: 800; left: 14px; position: absolute; }
.gptb-input-wrap input { padding-left: 32px; }
.gptb-input-percent > span { left: auto; right: 14px; }
.gptb-input-percent input { padding-left: 14px; padding-right: 32px; }
.gptb-form-error { background: #fff1f0; border-left: 4px solid var(--gptb-error); color: #801b13; padding: 12px 16px; }
.gptb-results { background: var(--gptb-mist); border: 1px solid #bfe7e2; border-radius: 24px; margin-top: 36px; padding: clamp(24px, 5vw, 52px); }
.gptb-big-result { font-size: clamp(1.5rem, 4vw, 2.5rem); }
.gptb-big-result strong { color: var(--gptb-teal-dark); font-size: 1.6em; }
.gptb-result-grid { display: grid; gap: 14px; grid-template-columns: repeat(4, 1fr); margin: 28px 0; }
.gptb-result-grid > div { background: #fff; border-radius: 12px; padding: 18px; }
.gptb-result-grid span { color: var(--gptb-slate); display: block; font-size: .86rem; }
.gptb-result-grid strong { display: block; font-size: 1.45rem; margin-top: 6px; }
.gptb-actions-list, .gptb-book-recommendation { background: #fff; border-radius: 16px; margin-top: 24px; padding: 28px; }
.gptb-book-recommendation { background: var(--gptb-lavender); }
.gptb-optional-note, .gptb-disclaimer { color: var(--gptb-slate); font-size: .86rem; }
.gptb-book-subtitle { color: var(--gptb-purple-dark); font-size: 1.18rem; font-weight: 700; }
.gptb-book-outcome { color: var(--gptb-slate); font-size: 1.08rem; }
.gptb-trust-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0; }
.gptb-trust-row span { background: var(--gptb-mist); border-radius: 99px; color: var(--gptb-teal-dark); font-size: .82rem; font-weight: 750; padding: 6px 10px; }
.gptb-library-grid { display: grid; gap: 20px; }
.gptb-library-card { align-items: center; border: 1px solid var(--gptb-border); border-radius: 16px; display: grid; gap: 22px; grid-template-columns: 120px 1fr; padding: 20px; }
.gptb-empty-library { background: var(--gptb-lavender); border-radius: 18px; padding: 36px; }
.gptb-library-help { margin-top: 28px; }
[hidden] { display: none !important; }
:focus-visible { outline: 3px solid var(--gptb-gold); outline-offset: 3px; }

@media (max-width: 980px) {
  .gptb-grid-4, .gptb-book-grid, .gptb-grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .gptb-result-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 680px) {
  .gptb-grid-2, .gptb-grid-3, .gptb-grid-4, .gptb-book-grid { grid-template-columns: 1fr; }
  .gptb-hero { border-radius: 18px; margin-bottom: 32px; padding: 42px 24px; }
  .gptb-section { padding: 48px 16px; }
  .gptb-calculator-callout { align-items: stretch; flex-direction: column; gap: 20px; padding: 30px 24px; }
  .gptb-calculator-callout .gptb-button, .gptb-calculator-form .gptb-button, .gptb-result-actions .gptb-button { width: 100%; }
  .gptb-result-grid { grid-template-columns: 1fr; }
  .gptb-library-card { align-items: start; grid-template-columns: 84px 1fr; }
}

@media print {
  header, footer, nav, .gptb-calculator-form, .gptb-result-actions, .gptb-book-recommendation { display: none !important; }
  .gptb-results { border: 0; margin: 0; padding: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}