/* =====================================================
   base.css — Design Tokens, Reset, Shared Components
   ===================================================== */

:root {
  /* Brand Colors */
  --primary:        #00AEEF;
  --primary-dark:   #0090C5;
  --accent:         #F59E0B;

  /* Neutrals */
  --text-main:      #2C2C2C;
  --text-light:     #666666;
  --text-muted:     #999999;

  /* Backgrounds — warm palette */
  --bg-white:       #FFFFFF;
  --bg-cream:       #FAF7F3;
  --bg-warm:        #FFF8F0;
  --border-warm:    #EDE5DC;

  /* Typography */
  --font-ja:   'Noto Sans JP', sans-serif;
  --font-en:   'Montserrat', sans-serif;
  --font-deco: 'Caveat', cursive;

  /* Spacing scale */
  --sp-xs:  0.5rem;
  --sp-sm:  1rem;
  --sp-md:  1.5rem;
  --sp-lg:  2.5rem;
  --sp-xl:  4rem;
  --sp-2xl: 6rem;

  /* Layout */
  --max-w:            1080px;
  --content-pad-x:    clamp(1.5rem, 3vw, 2.5rem);
  --header-h:         72px;

  /* Border radii */
  --r-sm:   8px;
  --r-md:   14px;
  --r-lg:   22px;
  --r-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px  rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.09);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.13);

  --transition: 0.25s ease;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; scroll-padding-top: var(--header-h); }
body {
  font-family: var(--font-ja);
  color: var(--text-main);
  line-height: 1.85;
  background: var(--bg-white);
  -webkit-font-smoothing: antialiased;
}
img  { display: block; max-width: 100%; height: auto; }
a    { text-decoration: none; color: inherit; transition: opacity var(--transition); }
a:hover { opacity: 0.8; }
ul, ol { list-style: none; }

/* ---- Typography Utilities ---- */
.font-en   { font-family: var(--font-en); }
.font-deco { font-family: var(--font-deco); }
.text-center  { text-align: center; }
.text-primary { color: var(--primary); }
.text-accent  { color: var(--accent); }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--r-full);
  font-family: var(--font-ja);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  white-space: nowrap;
}
.btn:hover { opacity: 1; transform: translateY(-2px); }

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 4px 14px rgba(0, 174, 239, 0.2);
}
.btn-primary:hover { box-shadow: 0 6px 20px rgba(0, 174, 239, 0.3); }

.btn-outline {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(4px);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.25); }

.btn-lg { padding: 1rem 2.25rem; font-size: 1.05rem; }
.btn-block { width: 100%; text-align: center; display: flex; }

.btn-text {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: var(--primary);
  font-weight: 700;
  font-size: 0.9rem;
  transition: gap var(--transition);
}
.btn-text:hover { opacity: 1; gap: 0.6rem; }

/* ---- Scroll-triggered Fade-in ---- */
.fade {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 1.4s ease-out, transform 1.4s ease-out;
}
.fade.delay-1 { transition-delay: 0.15s; }
.fade.delay-2 { transition-delay: 0.30s; }
.fade.visible { opacity: 1; transform: translateY(0); }