/* ============================================================
   Progress Platform — Design System v1.0
   Zinc gray scale + Brand Blue + LINE Green
   Fonts: Inter via Google Fonts (async), system fallbacks
   ============================================================ */

/* ── CSS Variables ─────────────────────────────────────────── */
:root {
  /* Gray Scale (Zinc) */
  --pg-black:    #09090B;
  --pg-gray-900: #18181B;
  --pg-gray-800: #27272A;
  --pg-gray-700: #3F3F46;
  --pg-gray-600: #52525B;
  --pg-gray-500: #71717A;
  --pg-gray-400: #A1A1AA;
  --pg-gray-300: #D4D4D8;
  --pg-gray-200: #E4E4E7;
  --pg-gray-100: #F4F4F5;
  --pg-gray-50:  #FAFAFA;
  --pg-white:    #FFFFFF;

  /* Brand */
  --pg-blue:      #2563EB;
  --pg-blue-dk:   #1D4ED8;
  --pg-blue-soft: #EFF6FF;
  --pg-green:     #16A34A;
  --pg-line:      #06C755;
  --pg-line-dk:   #05A847;

  /* Semantic Tokens */
  --pg-bg:      #FFFFFF;
  --pg-bg-soft: #FAFAFA;
  --pg-bg-dark: #09090B;
  --pg-text:    #09090B;
  --pg-text-2:  #52525B;
  --pg-text-3:  #A1A1AA;
  --pg-border:  #E4E4E7;

  /* Typography */
  --pg-font: 'Inter', -apple-system, BlinkMacSystemFont,
             'Noto Sans JP', 'Hiragino Sans', 'Yu Gothic', sans-serif;
  --pg-font-mono: 'SF Mono', 'Fira Code', monospace;

  /* Layout */
  --pg-nav-h:       64px;
  --pg-container:   1200px;
  --pg-container-sm: 800px;
  --pg-px:     clamp(16px, 5vw, 48px);
  --pg-py-sm:  clamp(48px, 6vw, 80px);
  --pg-py:     clamp(72px, 9vw, 120px);
  --pg-py-lg:  clamp(96px, 12vw, 160px);

  /* Border Radius */
  --pg-r-sm:   4px;
  --pg-r:      8px;
  --pg-r-md:   12px;
  --pg-r-lg:   16px;
  --pg-r-xl:   24px;
  --pg-r-full: 9999px;

  /* Shadows */
  --pg-sh-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --pg-sh:    0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px -2px rgba(0,0,0,.05);
  --pg-sh-md: 0 10px 15px -3px rgba(0,0,0,.07), 0 4px 6px -4px rgba(0,0,0,.05);
  --pg-sh-lg: 0 20px 25px -5px rgba(0,0,0,.06), 0 8px 10px -6px rgba(0,0,0,.04);

  /* Easing */
  --pg-ease:   cubic-bezier(0.16, 1, 0.3, 1);
  --pg-t:      200ms ease;
  --pg-t-fast: 120ms ease;
  --pg-t-slow: 400ms var(--pg-ease);

  /* Z-index */
  --pg-z-nav:     100;
  --pg-z-overlay: 200;
  --pg-z-modal:   300;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--pg-nav-h) + 16px);
}

body {
  font-family: var(--pg-font);
  color: var(--pg-text);
  background: var(--pg-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}
a:focus-visible {
  outline: 2px solid var(--pg-blue);
  outline-offset: 3px;
  border-radius: var(--pg-r-sm);
}

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

ul, ol { list-style: none; }

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

input, select, textarea {
  font-family: inherit;
}

/* ── Typography ─────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--pg-text);
}

h1 { font-size: clamp(2rem,    4.5vw, 3.75rem); }
h2 { font-size: clamp(1.6rem,  3.2vw, 2.75rem); }
h3 { font-size: clamp(1.125rem, 2vw,  1.5rem);  }
h4 { font-size: clamp(1rem,    1.5vw, 1.125rem); }

p { line-height: 1.75; }

/* ── Layout ─────────────────────────────────────────────────── */
.pg-container {
  width: 100%;
  max-width: var(--pg-container);
  margin-inline: auto;
  padding-inline: var(--pg-px);
}

.pg-container-sm {
  width: 100%;
  max-width: var(--pg-container-sm);
  margin-inline: auto;
  padding-inline: var(--pg-px);
}

/* ── Grid ───────────────────────────────────────────────────── */
.pg-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(1.5rem, 3vw, 2rem);
}
.pg-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.25rem, 2.5vw, 2rem);
}
.pg-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(1rem, 2vw, 1.5rem);
}

@media (max-width: 640px) {
  .pg-grid-2 { grid-template-columns: 1fr; }
}
@media (max-width: 767px) {
  .pg-grid-3, .pg-grid-4 { grid-template-columns: 1fr; }
}
@media (min-width: 641px) and (max-width: 1023px) {
  .pg-grid-3 { grid-template-columns: repeat(2, 1fr); }
  .pg-grid-4 { grid-template-columns: repeat(2, 1fr); }
}

/* ── Section ────────────────────────────────────────────────── */
.pg-sec    { padding-block: var(--pg-py); }
.pg-sec-sm { padding-block: var(--pg-py-sm); }
.pg-sec-lg { padding-block: var(--pg-py-lg); }

.pg-sec-soft { background: var(--pg-bg-soft); }
.pg-sec-dark {
  background: var(--pg-bg-dark);
  color: rgba(255,255,255,.85);
}
.pg-sec-dark h1, .pg-sec-dark h2,
.pg-sec-dark h3, .pg-sec-dark h4 { color: #fff; }

/* ── Text Utilities ─────────────────────────────────────────── */
.pg-eyebrow {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--pg-blue);
  margin-bottom: 12px;
}
.pg-eyebrow.light { color: rgba(255,255,255,.48); }

.pg-lead {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  color: var(--pg-text-2);
  line-height: 1.8;
  max-width: 58ch;
}
.pg-lead.center { margin-inline: auto; text-align: center; }

.text-center { text-align: center; }
.text-balance { text-wrap: balance; }

/* ── Scroll Reveal ───────────────────────────────────────────── */
.rv {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .55s var(--pg-ease), transform .55s var(--pg-ease);
}
.rv.in { opacity: 1; transform: translateY(0); }
.rv.d1 { transition-delay: .08s; }
.rv.d2 { transition-delay: .16s; }
.rv.d3 { transition-delay: .24s; }
.rv.d4 { transition-delay: .32s; }
.rv.d5 { transition-delay: .40s; }

/* ── Misc ───────────────────────────────────────────────────── */
.pg-divider { border: none; border-top: 1px solid var(--pg-border); }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}