/*
 * Shared visual foundation
 * Warm, editorial styling for the site's common layout and components.
 */

:root {
  color-scheme: light;

  /* Colour */
  --color-page: #f4f0e8;
  --color-surface: #fcfaf6;
  --color-surface-muted: #eee9e0;
  --color-text: #302d2a;
  --color-heading: #232227;
  --color-muted: #6b655e;
  --color-border: #ddd5c9;
  --color-accent: #5b4aa8;
  --color-accent-strong: #443783;
  --color-accent-soft: #e9e5f5;
  --color-footer: #292832;
  --color-on-dark: #fcfaf6;
  --color-focus: #7566bd;

  /* Backwards-compatible aliases used by the existing page styles */
  --primary-color: var(--color-text);
  --accent-color: var(--color-accent);
  --accent-color-2: #6a5ab2;
  --bg-light: var(--color-surface);

  /* Typography */
  --font-body: "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
  --font-heading: "Open Sans", "Helvetica Neue", Arial, sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --line-height-body: 1.7;
  --line-height-heading: 1.2;

  /* Spacing */
  --spacing-2xs: 4px;
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-2xl: 72px;

  /* Layout and shape */
  --content-width: 900px;
  --header-width: 1100px;
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 20px;
  --radius-pill: 9999px;

  /* Depth and movement */
  --shadow-sm: 0 1px 2px rgba(47, 39, 30, 0.06),
    0 4px 12px rgba(47, 39, 30, 0.04);
  --shadow-md: 0 12px 32px rgba(47, 39, 30, 0.09);
  --ease-standard: cubic-bezier(0.22, 1, 0.36, 1);
  --transition-fast: 180ms ease;
  --transition-smooth: 650ms var(--ease-standard);
}

/* ========== Reset and document ========== */

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

html {
  min-height: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  color: var(--color-text);
  background-color: var(--color-page);
  background-image:
    radial-gradient(circle at 85% -10%, rgba(91, 74, 168, 0.07), transparent 34rem),
    linear-gradient(180deg, rgba(255, 255, 255, 0.2), transparent 24rem);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: var(--line-height-body);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

main {
  display: block;
}

img,
picture,
svg,
video,
canvas {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

button,
input,
textarea,
select {
  font: inherit;
}

button,
[type="button"],
[type="submit"] {
  cursor: pointer;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 var(--spacing-sm);
  color: var(--color-heading);
  font-family: var(--font-heading);
  line-height: var(--line-height-heading);
  text-wrap: balance;
}

p,
ul,
ol,
blockquote {
  margin-top: 0;
}

a {
  color: var(--color-accent-strong);
  text-decoration-color: rgba(68, 55, 131, 0.45);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

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

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

::selection {
  color: var(--color-heading);
  background: var(--color-accent-soft);
}

/* ========== Shared layout ========== */

.container {
  width: min(100% - (2 * var(--spacing-sm)), var(--content-width));
  margin-inline: auto;
}

.container-wide {
  width: min(100% - (2 * var(--spacing-sm)), var(--header-width));
  margin-inline: auto;
}

.content-narrow {
  max-width: 68ch;
  margin-inline: auto;
}

.section {
  padding-block: clamp(var(--spacing-lg), 6vw, var(--spacing-2xl));
}

.page-title {
  width: min(100% - (2 * var(--spacing-sm)), var(--content-width));
  margin: clamp(var(--spacing-lg), 6vw, var(--spacing-xl)) auto var(--spacing-md);
  color: var(--color-heading);
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  text-align: center;
}

.page-title::after {
  content: "";
  display: block;
  width: 56px;
  height: 2px;
  margin: var(--spacing-sm) auto 0;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
}

/* ========== Header and pill navigation ========== */

.site-header {
  position: relative;
  z-index: 100;
  padding-block: 10px;
  color: var(--color-on-dark);
  background: linear-gradient(110deg, #2e2b3c, #3d365f 62%, #494077);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 3px 16px rgba(35, 31, 48, 0.14);
}

.header-inner {
  width: min(100% - (2 * var(--spacing-sm)), var(--header-width));
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
}

.brand {
  flex: 0 0 auto;
  color: var(--color-on-dark);
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.015em;
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.brand:hover {
  color: var(--color-on-dark);
  opacity: 0.82;
}

.brand:focus-visible,
.nav-pill a:focus-visible {
  outline-color: var(--color-on-dark);
}

.nav-pill {
  margin: 0;
  padding: 6px;
  display: flex;
  align-items: center;
  gap: clamp(2px, 0.8vw, 8px);
  list-style: none;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.08);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.nav-pill a {
  display: block;
  padding: 8px 13px;
  border-radius: var(--radius-pill);
  color: rgba(252, 250, 246, 0.9);
  font-family: var(--font-heading);
  font-size: 0.925rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast),
    transform var(--transition-fast);
}

.nav-pill a:hover {
  color: var(--color-on-dark);
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-1px);
}

.nav-pill a.active,
.nav-pill a[aria-current="page"] {
  color: var(--color-accent-strong);
  background: var(--color-surface);
  box-shadow: 0 2px 8px rgba(25, 22, 34, 0.13);
}

/* ========== Media and surfaces ========== */

section.banner {
  width: 100%;
  margin-bottom: var(--spacing-lg);
  overflow: hidden;
  background: var(--color-surface-muted);
}

section.banner img {
  width: 100%;
  object-fit: cover;
}

.card {
  padding: clamp(var(--spacing-sm), 3vw, var(--spacing-md));
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.card--elevated {
  box-shadow: var(--shadow-md);
}

/* ========== Buttons and action rows ========== */

.button-row,
.download-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.btn-primary,
.btn-cta,
.btn-outline {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
}

.btn-primary,
.btn-cta {
  color: #fff;
  background: var(--color-accent-strong);
  box-shadow: 0 5px 14px rgba(68, 55, 131, 0.2);
}

.btn-primary:hover,
.btn-cta:hover {
  color: #fff;
  background: var(--color-accent);
  box-shadow: 0 8px 20px rgba(68, 55, 131, 0.24);
  transform: translateY(-1px);
}

.btn-primary:active,
.btn-cta:active,
.btn-outline:active {
  transform: translateY(0);
}

.btn-outline {
  color: var(--color-accent-strong);
  background: transparent;
  border-color: var(--color-accent);
  box-shadow: none;
}

.btn-outline:hover {
  color: var(--color-accent-strong);
  background: var(--color-accent-soft);
  border-color: var(--color-accent-strong);
  box-shadow: 0 6px 16px rgba(68, 55, 131, 0.1);
  transform: translateY(-1px);
}

.btn-primary {
  width: 100%;
  border-radius: var(--radius-sm);
}

.download-link {
  color: var(--color-accent-strong);
  font-family: var(--font-heading);
  font-weight: 600;
  text-underline-offset: 0.25em;
}

/* ========== Forms ========== */

.grid {
  display: grid;
  gap: var(--spacing-sm);
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
}

label {
  color: var(--color-heading);
  font-family: var(--font-heading);
  font-size: 0.925rem;
  font-weight: 700;
}

input,
textarea,
select {
  width: 100%;
  padding: 11px 13px;
  color: var(--color-text);
  background: #fffdf9;
  border: 1px solid #bfb6aa;
  border-radius: var(--radius-sm);
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

textarea {
  min-height: 8rem;
  resize: vertical;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  background: #fff;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(91, 74, 168, 0.16);
}

/* ========== Footer and social links ========== */

footer {
  margin-top: auto;
  padding: var(--spacing-md) var(--spacing-sm);
  color: rgba(252, 250, 246, 0.86);
  background: var(--color-footer);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
}

.social-links a {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  border-radius: 50%;
  color: var(--color-on-dark);
  font-size: 1.35rem;
  text-decoration: none;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast),
    transform var(--transition-fast);
}

.social-links a:hover,
.social-links a:focus-visible {
  color: var(--color-on-dark);
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

/* Font Awesome adds padding and margins to .fa in some page styles. */
.social-links .fa {
  padding: 0;
  margin: 0;
}

/* ========== Progress and entrance motion ========== */

#scroll-progress {
  position: fixed;
  inset: 0 auto auto 0;
  z-index: 9999;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent-strong), #7566bd);
  box-shadow: 0 1px 5px rgba(68, 55, 131, 0.2);
  transition: width 150ms ease-out;
}

.fade-in {
  opacity: 0;
  transform: translateY(14px);
  will-change: opacity, transform;
  transition:
    opacity var(--transition-smooth),
    transform var(--transition-smooth);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== Responsive behavior ========== */

@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    justify-content: center;
    gap: 10px;
  }

  .nav-pill {
    max-width: 100%;
    flex-wrap: wrap;
    justify-content: center;
  }

  .nav-pill a {
    padding: 8px 11px;
  }

  .grid.two {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container,
  .container-wide,
  .header-inner,
  .page-title {
    width: min(100% - (2 * 12px), var(--content-width));
  }

  .site-header {
    padding-block: 8px;
  }

  .brand {
    font-size: 1.1rem;
  }

  .nav-pill {
    padding: 4px;
    gap: 1px;
  }

  .nav-pill a {
    padding: 7px 9px;
    font-size: var(--font-size-sm);
  }

  .page-title {
    font-size: clamp(1.8rem, 10vw, 2.4rem);
  }
}

/* ========== Motion accessibility ========== */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .fade-in,
  .fade-in.visible {
    opacity: 1;
    transform: none;
    will-change: auto;
  }
}