/* =========================================================================
   KidBooks App — Design System
   ========================================================================= */

:root {
  /* Palette — KidBooks neutro (warm friendly, non Bosco-specific) */
  --color-bg: #FAF6EE;
  --color-bg-soft: #FFFBF0;
  --color-bg-elev: #FFFFFF;
  --color-primary: #E08283;        /* coral pink — calore, libro, casa */
  --color-primary-dark: #C76A6B;
  --color-secondary: #2F7A8B;      /* deep teal — affidabile, intellettuale */
  --color-secondary-dark: #245F6D;
  --color-accent: #F4B942;         /* warm yellow — sole, gioia */
  --color-text: #1F2937;
  --color-text-soft: #4B5563;
  --color-text-muted: #6B7280;
  --color-border: #E7DFD0;
  --color-border-soft: #F0E9DA;

  /* Type */
  --font-display: "Fredoka", "Trebuchet MS", system-ui, sans-serif;
  --font-body: "Lora", Georgia, "Times New Roman", serif;

  /* Type scale */
  --fs-xs: 0.8125rem;
  --fs-sm: 0.9375rem;
  --fs-base: 1.0625rem;
  --fs-md: 1.1875rem;
  --fs-lg: 1.5rem;
  --fs-xl: 2rem;
  --fs-2xl: 2.75rem;
  --fs-3xl: 3.75rem;

  /* Spacing */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-7: 3rem;
  --sp-8: 4rem;
  --sp-9: 6rem;

  /* Layout */
  --container-max: 1100px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-pill: 999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(31, 41, 55, 0.06), 0 1px 3px rgba(31, 41, 55, 0.05);
  --shadow-md: 0 4px 12px rgba(31, 41, 55, 0.08), 0 2px 4px rgba(31, 41, 55, 0.04);
  --shadow-lg: 0 12px 32px rgba(31, 41, 55, 0.12), 0 4px 12px rgba(31, 41, 55, 0.06);

  /* Motion */
  --t-fast: 160ms cubic-bezier(.4, 0, .2, 1);
  --t-base: 240ms cubic-bezier(.4, 0, .2, 1);
  --t-slow: 320ms cubic-bezier(.4, 0, .2, 1);
}

/* -------------------------------------------------------------------------
   Reset minimale
   ------------------------------------------------------------------------- */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg, video { max-width: 100%; height: auto; display: block; }
button { font: inherit; cursor: pointer; }
a { color: var(--color-secondary); text-decoration: none; transition: color var(--t-fast); }
a:hover { color: var(--color-secondary-dark); }
a:focus-visible, button:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-text);
  margin: 0 0 var(--sp-4);
  letter-spacing: -0.01em;
}
h1 { font-size: var(--fs-2xl); }
h2 { font-size: var(--fs-xl); }
h3 { font-size: var(--fs-lg); }
p { margin: 0 0 var(--sp-4); }

/* -------------------------------------------------------------------------
   Layout primitives
   ------------------------------------------------------------------------- */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--sp-5);
}

.section {
  padding-block: var(--sp-7);
}

.section-narrow {
  padding-block: var(--sp-6);
}

/* -------------------------------------------------------------------------
   Header
   ------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 246, 238, 0.92);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--color-border-soft);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--sp-4);
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-md);
  color: var(--color-text);
}
.site-logo:hover { color: var(--color-primary); }
.site-logo svg { height: 32px; width: auto; }

.site-nav a {
  margin-left: var(--sp-5);
  font-family: var(--font-display);
  font-size: var(--fs-sm);
  color: var(--color-text-soft);
}
.site-nav a:hover { color: var(--color-primary); }

/* -------------------------------------------------------------------------
   Hero
   ------------------------------------------------------------------------- */

.hero {
  padding-block: var(--sp-8) var(--sp-7);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero__eyebrow {
  display: inline-block;
  font-family: var(--font-display);
  font-size: var(--fs-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-secondary);
  background: rgba(47, 122, 139, 0.08);
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--radius-pill);
  margin-bottom: var(--sp-5);
}

.hero__title {
  font-size: var(--fs-3xl);
  margin-bottom: var(--sp-5);
  max-width: 18ch;
  margin-inline: auto;
}

.hero__title em {
  font-style: normal;
  color: var(--color-primary);
}

.hero__tagline {
  font-size: var(--fs-md);
  color: var(--color-text-soft);
  max-width: 52ch;
  margin-inline: auto;
}

/* Decorative sparkles on hero */
.hero__decor {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: -1;
}
.hero__decor::before,
.hero__decor::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.5;
}
.hero__decor::before {
  width: 320px;
  height: 320px;
  background: var(--color-primary);
  top: -80px;
  left: -80px;
  opacity: 0.18;
}
.hero__decor::after {
  width: 280px;
  height: 280px;
  background: var(--color-accent);
  bottom: -80px;
  right: -60px;
  opacity: 0.22;
}

/* -------------------------------------------------------------------------
   Buttons
   ------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  min-height: 48px;
  padding: var(--sp-3) var(--sp-5);
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--fs-sm);
  border: 2px solid transparent;
  transition: all var(--t-base);
  text-decoration: none;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn--primary:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  background: var(--color-secondary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn--secondary:hover {
  background: var(--color-secondary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(224, 130, 131, 0.06);
}

.btn--large {
  min-height: 56px;
  padding: var(--sp-4) var(--sp-6);
  font-size: var(--fs-base);
}

/* -------------------------------------------------------------------------
   Saga / Volume cards
   ------------------------------------------------------------------------- */

.card-grid {
  display: grid;
  gap: var(--sp-5);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .card-grid--3 { grid-template-columns: repeat(3, 1fr); }
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--color-bg-elev);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--t-base), box-shadow var(--t-base);
  border: 1px solid var(--color-border-soft);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card--link { color: inherit; }
.card--link:hover { color: inherit; }

.card__cover {
  aspect-ratio: 4 / 3;
  background: linear-gradient(135deg, #F4B942 0%, #E08283 100%);
  position: relative;
  overflow: hidden;
}
.card__cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.card__cover--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  text-align: center;
  padding: var(--sp-5);
}

.card__body {
  padding: var(--sp-5) var(--sp-5) var(--sp-6);
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card__title {
  font-size: var(--fs-lg);
  margin-bottom: var(--sp-3);
}

.card__desc {
  color: var(--color-text-soft);
  font-size: var(--fs-sm);
  margin-bottom: var(--sp-5);
  flex: 1;
}

.card__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--color-primary);
  font-size: var(--fs-sm);
  align-self: flex-start;
  transition: gap var(--t-fast);
}
.card:hover .card__cta { gap: var(--sp-3); }

.card--coming-soon {
  opacity: 0.7;
  background: var(--color-bg-soft);
}
.card--coming-soon:hover {
  transform: none;
  box-shadow: var(--shadow-sm);
}
.card--coming-soon .card__cover {
  background: linear-gradient(135deg, #D5CDB8 0%, #B8AC91 100%);
}
.card__badge {
  position: absolute;
  top: var(--sp-3);
  right: var(--sp-3);
  background: rgba(31, 41, 55, 0.85);
  color: #fff;
  font-family: var(--font-display);
  font-size: var(--fs-xs);
  padding: var(--sp-1) var(--sp-3);
  border-radius: var(--radius-pill);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* -------------------------------------------------------------------------
   Section heading
   ------------------------------------------------------------------------- */

.section-head {
  text-align: center;
  margin-bottom: var(--sp-6);
}
.section-head h2 {
  margin-bottom: var(--sp-3);
}
.section-head p {
  color: var(--color-text-soft);
  max-width: 56ch;
  margin-inline: auto;
}

/* -------------------------------------------------------------------------
   Back link
   ------------------------------------------------------------------------- */

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--font-display);
  font-size: var(--fs-sm);
  color: var(--color-text-soft);
  margin-bottom: var(--sp-5);
}
.back-link:hover { color: var(--color-primary); }
.back-link span { transition: transform var(--t-fast); display: inline-block; }
.back-link:hover span { transform: translateX(-3px); }

/* -------------------------------------------------------------------------
   Footer
   ------------------------------------------------------------------------- */

.site-footer {
  margin-top: var(--sp-8);
  padding-block: var(--sp-6);
  border-top: 1px solid var(--color-border-soft);
  background: var(--color-bg-soft);
  text-align: center;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}
.site-footer p { margin: 0; }
.site-footer .heart { color: var(--color-primary); }

/* -------------------------------------------------------------------------
   404
   ------------------------------------------------------------------------- */

.error-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
  padding: var(--sp-7) var(--sp-5);
}
.error-page__code {
  font-family: var(--font-display);
  font-size: 8rem;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--sp-3);
}

/* -------------------------------------------------------------------------
   Responsive overrides
   ------------------------------------------------------------------------- */

@media (max-width: 767px) {
  :root {
    --fs-3xl: 2.5rem;
    --fs-2xl: 2rem;
    --fs-xl: 1.625rem;
  }
  .hero { padding-block: var(--sp-7) var(--sp-6); }
  .section { padding-block: var(--sp-6); }
  .site-nav a { margin-left: var(--sp-4); }
  .site-nav a:first-child { margin-left: 0; }
}

@media (max-width: 480px) {
  .site-nav { display: none; }
}

/* -------------------------------------------------------------------------
   Reduced motion
   ------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
    scroll-behavior: auto !important;
  }
}