/* =============================================================
   Leo's Explorer — style.css
   Warm, child-friendly, mobile-first layout
   ============================================================= */

/* ── Reset & base ─────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Colors */
  --clr-bg:          #faf8f4;
  --clr-hero-from:   #3a6bc7;
  --clr-hero-to:     #5b9bd5;
  --clr-accent:      #f0a500;
  --clr-accent-soft: #fff4d6;
  --clr-teal:        #3aafa9;
  --clr-card-1:      #eef6ff;
  --clr-card-2:      #f0faf3;
  --clr-card-3:      #fef5e4;
  --clr-card-4:      #f0fdf4;
  --clr-card-5:      #fff0f0;
  --clr-text:        #1a1a2e;
  --clr-text-muted:  #5a5a7a;
  --clr-white:       #ffffff;
  --clr-footer-bg:   #1a1a2e;

  /* Typography */
  --font-body:    'Nunito', system-ui, sans-serif;
  --font-serif:   'Lora', Georgia, serif;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  /* Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;

  /* Shadow */
  --shadow-card: 0 4px 24px rgba(30, 40, 80, 0.08);
  --shadow-hover: 0 8px 36px rgba(30, 40, 80, 0.15);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; text-decoration: none; }

ul { list-style: none; }

/* ── Container ────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1100px;
  margin-inline: auto;
  padding-inline: 1.25rem;
}

/* ── Sections ─────────────────────────────────────────────── */
.section {
  padding-block: var(--space-lg);
}

.section__title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 600;
  color: var(--clr-text);
  text-align: center;
  margin-bottom: 0.5rem;
}

.section__subtitle {
  text-align: center;
  color: var(--clr-text-muted);
  font-size: 1.05rem;
  margin-bottom: var(--space-md);
}

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1rem;
  border-radius: 50px;
  padding: 0.75rem 1.75rem;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
  border: none;
}

.btn--hero {
  background: var(--clr-accent);
  color: var(--clr-text);
  box-shadow: 0 4px 18px rgba(240, 165, 0, 0.4);
  margin-top: var(--space-sm);
}

.btn--hero:hover,
.btn--hero:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(240, 165, 0, 0.5);
}

.btn--card {
  background: var(--clr-hero-from);
  color: var(--clr-white);
  font-size: 0.95rem;
  padding: 0.65rem 1.5rem;
  box-shadow: 0 3px 12px rgba(58, 107, 199, 0.3);
  margin-top: auto;
  align-self: flex-start;
}

.btn--card:hover,
.btn--card:focus-visible {
  background: #2f5ab5;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(58, 107, 199, 0.4);
}

.btn:focus-visible {
  outline: 3px solid var(--clr-accent);
  outline-offset: 3px;
}

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  position: relative;
  background: linear-gradient(135deg, var(--clr-hero-from) 0%, var(--clr-hero-to) 100%);
  color: var(--clr-white);
  text-align: center;
  padding-top: var(--space-xl);
  padding-bottom: calc(var(--space-xl) + 2rem);
  overflow: hidden;
}

.hero__stars {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.star {
  position: absolute;
  color: rgba(255, 255, 255, 0.35);
  font-size: 1.2rem;
  animation: twinkle 3s ease-in-out infinite;
}

.star--1 { top: 12%; left: 8%;  animation-delay: 0s;    font-size: 1.4rem; }
.star--2 { top: 22%; right: 10%; animation-delay: 0.7s;  font-size: 0.9rem; }
.star--3 { top: 60%; left: 5%;  animation-delay: 1.2s;  font-size: 1rem;   }
.star--4 { top: 75%; right: 6%; animation-delay: 0.4s;  font-size: 1.5rem; }
.star--5 { top: 45%; left: 90%; animation-delay: 1.8s;  font-size: 0.8rem; }
.star--6 { top: 10%; left: 55%; animation-delay: 2.1s;  font-size: 1.1rem; }

@keyframes twinkle {
  0%, 100% { opacity: 0.3; transform: scale(1);    }
  50%       { opacity: 0.8; transform: scale(1.2);  }
}

.hero__inner {
  position: relative;
  z-index: 1;
}

.hero__badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 0.35rem 1rem;
  margin-bottom: 1.25rem;
  backdrop-filter: blur(6px);
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 6vw, 3.6rem);
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: 1.25rem;
}

.hero__subtitle {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: rgba(255, 255, 255, 0.88);
  max-width: 600px;
  margin-inline: auto;
  font-weight: 400;
}

.hero__wave {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  line-height: 0;
}

.hero__wave svg {
  width: 100%;
  height: 80px;
}

/* ── About ────────────────────────────────────────────────── */
.about {
  background: var(--clr-bg);
}

.about__inner {
  text-align: center;
  max-width: 680px;
}

.about__icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-sm);
}

.about__text {
  font-size: 1.08rem;
  color: var(--clr-text-muted);
  margin-bottom: 1rem;
}

.about__text:last-child {
  font-style: italic;
  color: var(--clr-text);
  font-weight: 600;
}

/* ── App Cards ────────────────────────────────────────────── */
.apps {
  background: var(--clr-white);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: var(--space-md);
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--clr-white);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(0, 0, 0, 0.05);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  position: relative;
  overflow: hidden;
}

.card:nth-child(1) { background: var(--clr-card-1); }
.card:nth-child(2) { background: var(--clr-card-2); }
.card:nth-child(3) { background: var(--clr-card-3); }
.card:nth-child(4) { background: var(--clr-card-4); }
.card:nth-child(5) { background: var(--clr-card-5); }

.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
}
.card:nth-child(1)::before { background: linear-gradient(90deg, #3a6bc7, #5b9bd5); }
.card:nth-child(2)::before { background: linear-gradient(90deg, #3aafa9, #52c9a0); }
.card:nth-child(3)::before { background: linear-gradient(90deg, #f0a500, #f7c948); }
.card:nth-child(4)::before { background: linear-gradient(90deg, #2d6a4f, #52b788); }
.card:nth-child(5)::before { background: linear-gradient(90deg, #c0392b, #e74c3c); }

.card:hover,
.card:focus-within {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.card__icon {
  font-size: 2.6rem;
  margin-bottom: 0.75rem;
  line-height: 1;
}

.card__title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
  color: var(--clr-text);
}

.card__desc {
  color: var(--clr-text-muted);
  font-size: 0.97rem;
  line-height: 1.65;
  margin-bottom: 1.1rem;
  flex-grow: 1;
}

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.4rem;
}

.card__tags li {
  background: rgba(0, 0, 0, 0.06);
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  padding: 0.3rem 0.8rem;
  color: var(--clr-text);
}

/* ── Learning Journey ─────────────────────────────────────── */
.journey {
  background: var(--clr-bg);
}

.journey__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-top: var(--space-md);
}

.journey__item {
  background: var(--clr-white);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  text-align: center;
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(0, 0, 0, 0.04);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.journey__item.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.journey__emoji {
  display: block;
  font-size: 2.2rem;
  margin-bottom: 0.6rem;
}

.journey__label {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--clr-text);
}

.journey__detail {
  font-size: 0.93rem;
  color: var(--clr-text-muted);
  line-height: 1.6;
}

/* ── Closing ──────────────────────────────────────────────── */
.closing {
  background: linear-gradient(135deg, #fffbf0 0%, #fef3e2 100%);
  border-top: 1px solid rgba(240, 165, 0, 0.15);
  border-bottom: 1px solid rgba(240, 165, 0, 0.15);
}

.closing__inner {
  text-align: center;
  max-width: 620px;
}

.closing__icon {
  font-size: 2.8rem;
  margin-bottom: 0.75rem;
}

.closing__title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: var(--clr-text);
}

.closing__text {
  font-size: 1.05rem;
  color: var(--clr-text-muted);
  margin-bottom: 0.9rem;
  text-align: left;
  font-style: italic;
  font-family: var(--font-serif);
}

.closing__signature {
  margin-top: 1.5rem;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--clr-text);
  text-align: right;
}

/* ── Footer ───────────────────────────────────────────────── */
.footer {
  background: var(--clr-footer-bg);
  color: rgba(255, 255, 255, 0.7);
  padding-block: var(--space-md);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  text-align: center;
}

.footer__text {
  font-size: 1rem;
  font-weight: 600;
  color: #f0d080;
}

.footer__copy {
  font-size: 0.8rem;
  opacity: 0.55;
}

.footer__contact {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.45);
  margin-top: 0.25rem;
}

.footer__contact-link {
  color: rgba(255, 255, 255, 0.55);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.footer__contact-link:hover,
.footer__contact-link:focus-visible {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
}

/* ── Fade-in animation utility ────────────────────────────── */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
}

/* ── Responsive tweaks ────────────────────────────────────── */
@media (max-width: 640px) {
  .hero {
    padding-top: var(--space-lg);
    padding-bottom: calc(var(--space-lg) + 2rem);
  }

  .hero__title {
    font-size: 1.9rem;
  }

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

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

  .section {
    padding-block: var(--space-md);
  }

  .card {
    padding: 1.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .journey__item,
  .fade-in {
    opacity: 1;
    transform: none;
  }
}