/* ==========================================================================
   Living Light -- styles-ll.css
   Base accessible framework + topic styles. Mobile-first.
   ========================================================================== */

:root {
  --color-bg: #0b1426;
  --color-text: #eef4fb;
  --color-accent: #5fe3c0;
  --color-accent-hover: #a6f5df;
  --color-border: #2c3e63;
  --color-surface: #13213b;

  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;

  --max-width: 1200px;
  --sidebar-width: 250px;

  /* Topic extras */
  --color-muted: #b9c6da;
  --color-glow-blue: #8fd3ff;
  --color-focus: #ffd866;
  --color-error: #ffb3b3;
  --radius: 0.75rem;
}

/* ---------- Reset-ish ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--color-bg);
  background-image:
    radial-gradient(ellipse at 50% -10%, rgba(95, 227, 192, 0.10), transparent 60%),
    radial-gradient(ellipse at 100% 100%, rgba(143, 211, 255, 0.06), transparent 50%);
  background-attachment: fixed;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
}

img,
svg {
  max-width: 100%;
  height: auto;
  display: block;
}

h1,
h2,
h3,
h4 {
  line-height: 1.2;
  margin: 0 0 var(--space-md);
  font-weight: 700;
}

h1 {
  font-size: 2.1rem;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 1.6rem;
  margin-top: var(--space-lg);
}

h3 {
  font-size: 1.25rem;
  margin-top: var(--space-md);
}

p {
  margin: 0 0 var(--space-md);
}

.main ul,
.main ol {
  padding-left: 1.6rem;
}

li + li {
  margin-top: var(--space-xs);
}

code,
kbd {
  font-family: var(--font-mono);
  font-size: 0.95em;
}

/* ---------- Links ---------- */
a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--color-accent-hover);
  text-decoration-thickness: 0.15em;
}

/* ---------- Focus (outline, not color alone) ---------- */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 0.1875rem solid var(--color-focus);
  outline-offset: 0.1875rem;
  border-radius: 0.125rem;
}

/* Fallback for browsers without :focus-visible */
a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus,
summary:focus {
  outline: 0.1875rem solid var(--color-focus);
  outline-offset: 0.1875rem;
}

a:focus:not(:focus-visible),
button:focus:not(:focus-visible) {
  outline: none;
}

/* ---------- Utilities ---------- */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute;
  left: var(--space-md);
  top: -10rem;
  z-index: 100;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 700;
  border-radius: 0 0 var(--radius) var(--radius);
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 0;
  color: var(--color-bg);
  outline: 0.1875rem solid var(--color-focus);
  outline-offset: 0;
}

/* ---------- Header + nav ---------- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: rgba(11, 20, 38, 0.92);
}

.site-header .container {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-sm);
  padding-top: var(--space-md);
  padding-bottom: var(--space-md);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-text);
  text-decoration: none;
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: 0.02em;
}

.brand:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

.brand img {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  border: 1px solid var(--color-border);
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-sm);
}

.site-nav li + li {
  margin-top: 0;
}

.site-nav a {
  display: inline-block;
  padding: var(--space-sm) var(--space-sm);
  min-height: 2.75rem;
  line-height: 1.75rem;
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 0.3em;
  border-radius: 0.375rem;
}

.site-nav a:hover {
  color: var(--color-accent-hover);
  text-decoration-color: currentColor;
}

/* Current page: underline weight + border, not color alone */
.site-nav a[aria-current="page"] {
  color: var(--color-accent);
  font-weight: 700;
  text-decoration-color: currentColor;
  text-decoration-thickness: 0.18em;
  box-shadow: inset 0 0 0 1px var(--color-border);
}

/* ---------- Main ---------- */
.main {
  display: block;
  padding-top: var(--space-lg);
  padding-bottom: var(--space-xl);
}

.main:focus {
  outline: none;
}

.prose {
  max-width: 44rem;
}

.lead {
  font-size: 1.2rem;
  color: var(--color-text);
}

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

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-glow-blue);
  margin-bottom: var(--space-sm);
}

/* ---------- Hero ---------- */
.hero {
  display: grid;
  gap: var(--space-lg);
  align-items: center;
  padding: var(--space-lg) 0;
}

.hero h1 {
  font-size: 2.4rem;
}

.hero-art {
  max-width: 22rem;
  margin: 0 auto;
}

.glow-text {
  color: var(--color-accent);
  text-shadow: 0 0 0.6rem rgba(95, 227, 192, 0.45);
}

/* ---------- Buttons ---------- */
.button,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  min-height: 2.75rem;
  padding: var(--space-sm) var(--space-md);
  font: inherit;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-bg);
  background: var(--color-accent);
  border: 2px solid var(--color-accent);
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
}

.button:hover,
button:hover {
  color: var(--color-bg);
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  text-decoration: underline;
}

.button-secondary {
  color: var(--color-accent);
  background: transparent;
  border-color: var(--color-accent);
}

.button-secondary:hover {
  color: var(--color-bg);
  background: var(--color-accent-hover);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

/* ---------- Cards ---------- */
.card-grid {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
  padding: 0;
  margin: var(--space-md) 0 0;
  list-style: none;
}

.main ul.card-grid,
.main ol.card-grid {
  padding-left: 0;
}

.card-grid > li + li {
  margin-top: 0;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-md) var(--space-md) var(--space-sm);
  height: 100%;
}

.card h2,
.card h3 {
  margin-top: 0;
}

.card-icon {
  width: 3rem;
  height: 3rem;
  margin-bottom: var(--space-sm);
}

.card .meta {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--color-muted);
}

dl.facts-list {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-xs) var(--space-md);
  margin: 0 0 var(--space-md);
}

dl.facts-list dt {
  font-weight: 700;
  color: var(--color-glow-blue);
}

dl.facts-list dd {
  margin: 0;
}

/* ---------- Callouts / asides ---------- */
.callout {
  border: 1px solid var(--color-border);
  border-left: 0.375rem solid var(--color-accent);
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: var(--space-md);
  margin: var(--space-lg) 0;
}

.callout h2,
.callout h3 {
  margin-top: 0;
}

/* ---------- Table of contents ---------- */
.toc {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-md);
  margin: var(--space-md) 0 var(--space-lg);
}

.toc h2 {
  margin-top: 0;
  font-size: 1.15rem;
}

/* ---------- Section rhythm ---------- */
.section {
  padding-top: var(--space-lg);
  margin-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

/* ---------- Fact cards (facts.html) ---------- */
.fact {
  position: relative;
  display: flex;
  flex-direction: column;
}

.fact .fact-number {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--color-glow-blue);
  margin: 0 0 var(--space-xs);
}

.fact h2 {
  font-size: 1.2rem;
  margin: 0 0 var(--space-sm);
}

.fact-actions {
  margin-top: auto;
  padding-top: var(--space-sm);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm) var(--space-md);
}

.share-btn {
  font-size: 0.95rem;
  min-height: 2.75rem;
}

.share-btn svg {
  width: 1.1rem;
  height: 1.1rem;
}

.share-status {
  position: fixed;
  left: 50%;
  bottom: var(--space-md);
  transform: translateX(-50%);
  z-index: 50;
  max-width: calc(100% - 2rem);
  margin: 0;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-text);
  color: var(--color-bg);
  font-weight: 700;
  border-radius: var(--radius);
  box-shadow: 0 0.5rem 1.5rem rgba(0, 0, 0, 0.45);
}

.share-status:empty {
  padding: 0;
  box-shadow: none;
  background: transparent;
}

.fact:target {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-accent);
}

/* ---------- Forms ---------- */
.form {
  max-width: 36rem;
  margin-top: var(--space-md);
}

.form-field {
  margin-bottom: var(--space-md);
}

.form label {
  display: block;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.req {
  font-weight: 400;
  color: var(--color-muted);
}

.hint {
  display: block;
  font-weight: 400;
  font-size: 0.95rem;
  color: var(--color-muted);
}

.field-error {
  display: block;
  font-weight: 700;
  color: var(--color-error);
}

.field-error:empty {
  display: none;
}

input[type="text"],
input[type="email"],
select,
textarea {
  display: block;
  width: 100%;
  min-height: 2.75rem;
  padding: var(--space-sm) var(--space-sm);
  font: inherit;
  color: var(--color-text);
  background: var(--color-surface);
  border: 2px solid #7f93b5;
  border-radius: 0.5rem;
}

textarea {
  min-height: 10rem;
  resize: vertical;
}

.has-error input,
.has-error textarea,
.has-error select {
  border-color: var(--color-error);
  border-width: 3px;
}

.error-summary {
  border: 3px solid var(--color-error);
  border-radius: var(--radius);
  padding: var(--space-md);
  margin-bottom: var(--space-lg);
  background: var(--color-surface);
}

.error-summary h2 {
  margin-top: 0;
  font-size: 1.2rem;
}

.error-summary a {
  color: var(--color-error);
}

.form-success {
  border: 1px solid var(--color-border);
  border-left: 0.375rem solid var(--color-accent);
  border-radius: var(--radius);
  padding: var(--space-md);
  background: var(--color-surface);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: var(--space-lg) 0;
  font-size: 0.95rem;
}

.site-footer p {
  margin-bottom: var(--space-sm);
}

.site-footer .footer-links {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-md);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-md);
}

.site-footer .footer-links li + li {
  margin-top: 0;
}

.site-footer .footer-links a {
  display: inline-block;
  padding: var(--space-xs) 0;
}

/* ---------- Decorative glow animation ---------- */
.glow-pulse {
  animation: glow-pulse 2.4s ease-in-out 2;
  transform-origin: center;
}

.drift {
  animation: drift 2.4s ease-in-out 2 alternate;
}

@keyframes glow-pulse {
  0%,
  100% {
    opacity: 0.75;
  }
  50% {
    opacity: 1;
  }
}

@keyframes drift {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(-0.4rem);
  }
}

@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;
  }

  .glow-pulse,
  .drift {
    animation: none !important;
  }
}

/* ---------- Larger screens ---------- */
@media (min-width: 40em) {
  h1 {
    font-size: 2.6rem;
  }

  .hero h1 {
    font-size: 3rem;
  }

  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 60em) {
  .container {
    padding: 0 var(--space-lg);
  }

  .site-header .container {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .hero {
    grid-template-columns: 1.3fr 1fr;
    padding: var(--space-xl) 0;
  }

  .hero h1 {
    font-size: 3.5rem;
  }

  .card-grid.three {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- Windows High Contrast / forced colors ---------- */
@media (forced-colors: active) {
  .site-nav a[aria-current="page"] {
    border: 2px solid CanvasText;
  }

  .button,
  button {
    border: 2px solid ButtonText;
  }
}

/* ---------- Print ---------- */
@media print {
  body {
    background: #ffffff;
    color: #000000;
  }

  .site-nav,
  .skip-link,
  .share-btn,
  .hero-art {
    display: none;
  }

  a {
    color: #000000;
  }
}