/*
  TLWH - Accessible, colour-blind friendly, keyboard/screen-reader friendly.
  - Strong contrast by default
  - Focus-visible rings
  - No info conveyed by colour alone
  - Reduced motion respected
*/

:root{
  --bg: #0b1220;
  --surface: #121b2f;
  --surface-2: #0f1728;
  --text: #f2f5ff;
  --muted: #c7d0ea;
  --border: rgba(255,255,255,0.14);

  /* accent colours chosen for colour-blind safety (blue + amber) */
  --accent: #4ea1ff;
  --accent-2: #ffbf47;

  --shadow: 0 12px 28px rgba(0,0,0,0.35);
  --radius: 16px;
  --radius-sm: 12px;

  --focus: 3px solid rgba(255,191,71,0.95);
  --focus-shadow: 0 0 0 5px rgba(78,161,255,0.35);

  --container: 1120px;
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --base: 18px;
  --line: 1.6;
}

/* Large text mode */
[data-text="large"]{
  --base: 20px;
}

/* High contrast mode */
[data-contrast="high"]{
  --bg: #000000;
  --surface: #0b0b0b;
  --surface-2: #0b0b0b;
  --text: #ffffff;
  --muted: #e7e7e7;
  --border: rgba(255,255,255,0.35);
  --accent: #7cc6ff;
  --accent-2: #ffd166;
  --shadow: 0 0 0 rgba(0,0,0,0);
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *, *::before, *::after{
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body{
  margin: 0;
  font-family: var(--font);
  font-size: var(--base);
  line-height: var(--line);
  background: radial-gradient(1200px 600px at 20% -10%, rgba(78,161,255,0.22), transparent 60%),
              radial-gradient(900px 500px at 100% 10%, rgba(255,191,71,0.20), transparent 60%),
              var(--bg);
  color: var(--text);
}

img{ max-width: 100%; height: auto; }

a{ color: var(--text); text-decoration-thickness: 2px; text-underline-offset: 4px; }
a:hover{ color: var(--text); text-decoration-color: var(--accent-2); }
a:focus-visible{ outline: var(--focus); box-shadow: var(--focus-shadow); border-radius: 10px; }

.container{
  width: min(var(--container), calc(100% - 2rem));
  margin: 0 auto;
}

.skip-link{
  position: absolute;
  left: -999px;
  top: 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.75rem 1rem;
  border-radius: 999px;
  z-index: 999;
}
.skip-link:focus{
  left: 1rem;
  outline: var(--focus);
  box-shadow: var(--focus-shadow);
}

.sr-only{
  position:absolute;
  width:1px;
  height:1px;
  padding:0;
  margin:-1px;
  overflow:hidden;
  clip: rect(0,0,0,0);
  white-space:nowrap;
  border:0;
}

.site-header{
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--border);
}

.header-inner{
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 0.75rem;
  align-items: center;
  padding: 0.75rem 0;
}

.brand{
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-picture{ display: inline-flex; }

.brand-mark{
  height: 64px;
  width: auto;
  border-radius: 12px;
  background: rgba(255,255,255,0.10);
  border: 2px solid var(--border);
  padding: 8px;
  box-shadow: 0 8px 18px rgba(0,0,0,0.35);
}

@media (max-width: 520px){
  .brand-mark{ height: 56px; padding: 7px; }
}

.brand-title{
  display:block;
  font-weight: 800;
  letter-spacing: 0.2px;
}
.brand-sub{ display:block; color: var(--muted); font-size: 0.92rem; }

.site-nav ul{
  display: flex;
  list-style: none;
  gap: 0.8rem;
  padding: 0;
  margin: 0;
}
.site-nav a{
  display: inline-block;
  padding: 0.55rem 0.65rem;
  border-radius: 999px;
  text-decoration: none;
  border: 1px solid transparent;
}
.site-nav a:not(.btn):hover{
  border-color: var(--border);
  background: rgba(255,255,255,0.06);
}
.site-nav a:not(.btn):focus-visible{
  outline: var(--focus);
  box-shadow: var(--focus-shadow);
}

.header-actions{
  display: flex;
  gap: 0.5rem;
}

.nav-toggle{
  display: none;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.06);
  color: var(--text);
  padding: 0.6rem 0.7rem;
  border-radius: 999px;
}
.nav-toggle:hover{ background: rgba(255,255,255,0.10); }
.nav-toggle:focus-visible{ outline: var(--focus); box-shadow: var(--focus-shadow); }

.nav-toggle-bars{
  display:block;
  width: 22px;
  height: 14px;
  position: relative;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  height:2px;
  background: var(--text);
  border-radius: 999px;
}
.nav-toggle-bars::before{ top: 2px; box-shadow: 0 5px 0 var(--text); }
.nav-toggle-bars::after{ bottom: 2px; }

.hero{
  padding: 3.2rem 0 2.2rem;
}

.hero-grid{
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 1.25rem;
  align-items: start;
}

.kicker{
  display:inline-block;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255,255,255,0.06);
}

h1{
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.12;
  margin: 0.9rem 0 0.85rem;
  letter-spacing: -0.3px;
}

.lead{ color: var(--muted); max-width: 60ch; }

.cta-row{ display:flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 1.25rem; }

.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  min-height: 44px; /* touch target */
}

.btn-primary{
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 60%, #ffffff 40%));
  color: #061024;
  border-color: rgba(255,255,255,0.22);
}

.btn-secondary{
  background: rgba(255,255,255,0.06);
  border-color: var(--border);
  color: var(--text);
}

.btn-ghost{
  background: rgba(255,255,255,0.06);
  border-color: var(--border);
  color: var(--text);
  padding: 0.6rem 0.85rem;
  font-weight: 700;
}

/* Hover highlight (also mirrored by focus-visible to avoid hover-only UX) */
.btn:hover{
  transform: translateY(-1px);
  box-shadow: var(--shadow);
  filter: brightness(1.03);
  border-color: color-mix(in srgb, var(--accent-2) 75%, transparent);
}

.btn:active{ transform: translateY(0); box-shadow: none; }
.btn:focus-visible{
  outline: var(--focus);
  box-shadow: var(--focus-shadow), var(--shadow);
  border-color: var(--accent-2);
}

/* Ensure nav CTA buttons keep true button sizing and styles */
.site-nav a.btn{
  padding: 0.72rem 1rem;
  border-radius: 999px;
  min-height: 44px;
  border-color: var(--border);
}

.trust{
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  padding: 0;
  list-style: none;
  margin: 1.4rem 0 0;
}

.trust li{
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
}

.trust-label{ display:block; font-size: 0.92rem; color: var(--muted); }
.trust-value{ display:block; font-weight: 700; }

.hero-card{
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(255,255,255,0.05);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero-card-body{ padding: 1.1rem; }

.section{ padding: 3rem 0; }
.section.alt{
  background: rgba(255,255,255,0.03);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-head{ max-width: 70ch; }
.section-head p{ color: var(--muted); }

h2{ font-size: clamp(1.5rem, 2.6vw, 2rem); margin: 0 0 0.4rem; }
.h3{ font-size: 1.2rem; margin: 0 0 0.35rem; }

.cards{
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
  margin-top: 1.25rem;
}

.card{
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius);
  padding: 1.1rem;
}

.card:focus-within{ outline: var(--focus); box-shadow: var(--focus-shadow); }

.split{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-top: 1.5rem;
  align-items: start;
}

.link-list{ padding-left: 1.1rem; }
.link-list a[aria-disabled="true"]{ opacity: 0.7; pointer-events: none; }

.muted{ color: var(--muted); }

.copybox{
  border: 1px dashed var(--border);
  background: rgba(0,0,0,0.15);
  border-radius: var(--radius-sm);
  padding: 1rem;
}
.copybox:focus-visible{ outline: var(--focus); box-shadow: var(--focus-shadow); }

.avatar{
  width: min(320px, 100%);
  aspect-ratio: 1 / 1;
  border-radius: 999px;
  border: 1px solid var(--border);
  overflow: hidden;
  background: rgba(0,0,0,0.18);
}

.avatar img{
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}


.chips{
  display:flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0.75rem 0 0;
}

.chips li{
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.06);
  border-radius: 999px;
  padding: 0.45rem 0.7rem;
  font-weight: 650;
}

.bullets{ padding-left: 1.1rem; }

.form{ display:grid; gap: 0.85rem; }
.field span{ display:block; font-weight: 700; margin-bottom: 0.35rem; }

input, textarea{
  width: 100%;
  padding: 0.75rem 0.8rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(0,0,0,0.18);
  color: var(--text);
  font: inherit;
}
input:focus-visible, textarea:focus-visible{ outline: var(--focus); box-shadow: var(--focus-shadow); }

.form-note{ color: var(--muted); font-size: 0.95rem; margin: 0; }

.sep{ border: 0; border-top: 1px solid var(--border); margin: 1.1rem 0; }

.site-footer{
  border-top: 1px solid var(--border);
  padding: 1.25rem 0;
  background: rgba(0,0,0,0.18);
}
.footer-inner{ display:flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }

.footer-links{ display:flex; gap: .55rem; align-items:center; flex-wrap:wrap; }
.footer-links .sep{ opacity:.55; }

/* Responsive */
@media (max-width: 920px){
  .hero-grid{ grid-template-columns: 1fr; }
  .trust{ grid-template-columns: 1fr; }
  .cards{ grid-template-columns: 1fr; }
  .split{ grid-template-columns: 1fr; }

  .header-inner{ grid-template-columns: 1fr auto auto; }
  .site-nav{ display:none; position: absolute; left: 1rem; right: 1rem; top: 4.4rem; }
  .site-nav.open{ display:block; }
  .site-nav ul{
    flex-direction: column;
    gap: 0.25rem;
    padding: 0.75rem;
    border: 1px solid var(--border);
    background: color-mix(in srgb, var(--bg) 86%, transparent);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
  }
  .nav-toggle{ display:inline-flex; }
}

@media (prefers-contrast: more){
  :root{ --border: rgba(255,255,255,0.28); }
}



/* Book cover (use <img> to avoid cropping) */
.book-cover-wrap{
  margin: 0;
  padding: 12px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(135deg, rgba(11,18,32,0.10), rgba(11,18,32,0.25));
}
.book-cover-img{
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
}


/* Media + book gallery */
.book-gallery{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.25rem 0 1.1rem;
}
.book-figure{
  margin: 0;
  padding: 0.9rem;
  border-radius: var(--radius);
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.book-figure img{
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.12);
}
.download-row{
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0 0 1.8rem;
}
.disabled{
  display: inline-block;
  padding: 0.55rem 0.75rem;
  border-radius: 12px;
  border: 1px dashed var(--border);
  color: var(--muted);
  background: rgba(255,255,255,0.04);
}

/* Details */
.details{
  margin: 1rem 0 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.04);
}
.details > summary{
  cursor: pointer;
  padding: 0.9rem 1rem;
  list-style: none;
  font-weight: 700;
}
.details > summary::-webkit-details-marker{ display:none; }
.details > summary:focus-visible{ outline: var(--focus); box-shadow: var(--focus-shadow); border-radius: 12px; }
.details-body{ padding: 0 1rem 1rem; color: var(--muted); }
.details[open]{ background: rgba(255,255,255,0.06); }

@media (max-width: 860px){
  .book-gallery{ grid-template-columns: 1fr; }
}


/* Visual text breakers */
.visual-break{ padding: 1.4rem 0 0; }
.breaker-figure{
  margin: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(255,255,255,0.04);
  box-shadow: var(--shadow);
}
.breaker-figure img{ display:block; width:100%; height:auto; }

.quote-break{
  margin-top: 1.35rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(255,255,255,0.05);
  box-shadow: var(--shadow);
  padding: 1.0rem 1.1rem;
  display: grid;
  grid-template-columns: 1fr;
  gap:  0;
  align-items: center;
}
.quote-mark{ width: 88px; height: auto; opacity: 0.95; }
.quote-text{
  margin: 0;
  font-weight: 800;
  letter-spacing: -0.2px;
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
}

/* Mobile top polish */
@media (max-width: 600px){
  .header-inner{
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto;
    padding: 0.65rem 0;
  }
  .header-actions{
    grid-column: 1 / -1;
    justify-content: flex-start;
    flex-wrap: wrap;
  }
  .btn-ghost{ padding: 0.5rem 0.7rem; font-size: 0.92rem; }
  .site-nav{ top: calc(100% + 0.55rem); }
  .hero{ padding: 2.25rem 0 1.65rem; }
  .kicker{ font-size: 0.95rem; display: inline-block; }
}

@media (max-width: 520px){
  h1{ font-size: clamp(1.85rem, 7vw, 2.35rem); }
  .lead{ font-size: 1.02rem; }
  .hero-card-body{ padding: 0.95rem; }
  .quote-break{ grid-template-columns: 1fr; }
  .quote-mark{ width: 64px; }
}