/* MottoEキャンパス — Refined design system */

:root {
  /* Refined orange (slightly desaturated, more sophisticated than #FF6B35) */
  --o-50:  #FFF7F2;
  --o-100: #FFEAE0;
  --o-200: #FFD2BE;
  --o-300: #FFB294;
  --o-400: #FA8A5E;
  --o-500: #EA5A1F;   /* primary brand */
  --o-600: #C84A18;
  --o-700: #9F3B14;

  --b-50:  #EFF4FF;
  --b-100: #DCE6FE;
  --b-500: #2A5BD7;   /* refined blue */
  --b-600: #1E45B5;
  --b-700: #173790;

  --g-50:  #ECFAF2;
  --g-100: #D1F2DD;
  --g-500: #0E8A4D;   /* refined green */
  --g-600: #0A6E3D;
  --g-700: #07532E;

  /* Warm neutrals */
  --ink-0:   #FFFFFF;
  --ink-50:  #FAFAF8;   /* warm white background */
  --ink-100: #F2F1ED;
  --ink-200: #E6E4DE;
  --ink-300: #C9C6BD;
  --ink-400: #908B7E;
  --ink-500: #6B6659;
  --ink-600: #4A463D;
  --ink-700: #2E2B25;
  --ink-800: #1B1915;
  --ink-900: #0E0D0B;

  --max: 1240px;
  --max-sm: 1040px;
  --max-text: 720px;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  font-feature-settings: "palt" 1, "kern" 1;
  color: var(--ink-800);
  background: var(--ink-0);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 16px;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }

h1, h2, h3, h4 {
  font-family: 'Inter', 'Noto Sans JP', sans-serif;
  font-weight: 700;
  letter-spacing: -0.022em;
  line-height: 1.18;
  color: var(--ink-900);
}
.jp-display {
  font-family: 'Noto Sans JP', 'Inter', sans-serif;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-500);
}

/* Layout primitives */
.container { max-width: var(--max); margin: 0 auto; padding: 0 32px; }
.container-sm { max-width: var(--max-sm); margin: 0 auto; padding: 0 32px; }
@media (max-width: 640px) {
  .container, .container-sm { padding: 0 20px; }
}

section { padding: 120px 0; }
@media (max-width: 768px) { section { padding: 72px 0; } }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
@media (max-width: 900px) {
  .grid-2 { grid-template-columns: 1fr; gap: 40px; }
  .grid-3 { grid-template-columns: 1fr; gap: 24px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 24px; border-radius: 999px;
  font-size: 15px; font-weight: 600;
  transition: all .2s cubic-bezier(.2,.7,.3,1);
  white-space: nowrap;
}
.btn-primary { background: var(--ink-900); color: var(--ink-0); }
.btn-primary:hover { background: var(--ink-700); transform: translateY(-1px); }
.btn-accent { background: var(--accent, var(--o-500)); color: #fff; }
.btn-accent:hover { background: var(--accent-dark, var(--o-600)); transform: translateY(-1px); box-shadow: 0 12px 28px -10px var(--accent, var(--o-500)); }
.btn-ghost { background: transparent; color: var(--ink-800); border: 1px solid var(--ink-200); }
.btn-ghost:hover { border-color: var(--ink-800); }
.btn-lg { padding: 18px 32px; font-size: 16px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.82);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--ink-100);
}
.header-inner {
  max-width: var(--max); margin: 0 auto;
  padding: 0 32px; height: 68px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand {
  display: inline-flex; align-items: baseline; gap: 2px;
  font-family: 'Inter', sans-serif;
  font-weight: 800; font-size: 19px;
  color: var(--ink-900); letter-spacing: -.02em;
}
.brand .e-mark { color: var(--accent, var(--o-500)); }
.brand-jp { font-family: 'Noto Sans JP', sans-serif; font-weight: 600; font-size: 15px; color: var(--ink-700); margin-left: 1px; }
.brand-tag {
  margin-left: 10px; padding: 3px 8px; border-radius: 5px;
  font-size: 11px; font-weight: 700;
  background: var(--accent-tint, var(--o-50));
  color: var(--accent, var(--o-500));
  letter-spacing: .02em;
}

.nav { display: flex; align-items: center; gap: 32px; }
.nav-link { font-size: 14px; color: var(--ink-600); font-weight: 500; transition: color .15s; }
.nav-link:hover { color: var(--ink-900); }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.nav-actions .btn { padding: 9px 18px; font-size: 14px; }

@media (max-width: 768px) {
  .nav { display: none; }
}

/* Footer */
.site-footer {
  background: var(--ink-900); color: var(--ink-300);
  padding: 80px 0 32px;
}
.footer-grid {
  max-width: var(--max); margin: 0 auto; padding: 0 32px;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px;
}
.footer-grid h4 { color: var(--ink-0); font-size: 13px; font-weight: 600; margin-bottom: 16px; letter-spacing: .04em; }
.footer-grid a { display: block; padding: 6px 0; color: var(--ink-300); font-size: 14px; transition: color .15s; }
.footer-grid a:hover { color: var(--ink-0); }
.footer-tag { color: var(--ink-400); font-size: 14px; margin-top: 12px; max-width: 320px; line-height: 1.7; }
.footer-bottom {
  max-width: var(--max); margin: 56px auto 0; padding: 24px 32px 0;
  border-top: 1px solid #2a2620;
  display: flex; justify-content: space-between;
  font-size: 12px; color: var(--ink-400);
}
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 8px; }
}

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .8s ease, transform .8s cubic-bezier(.2,.7,.3,1); }
.reveal.in { opacity: 1; transform: none; }

/* Dark mode utility (toggled via [data-theme="dark"]) */
[data-theme="dark"] {
  --ink-0:   #0E0D0B;
  --ink-50:  #1B1915;
  --ink-100: #2A2620;
  --ink-200: #3A352D;
  --ink-300: #6B6659;
  --ink-400: #908B7E;
  --ink-500: #B5B0A3;
  --ink-600: #D5D0C3;
  --ink-700: #E6E4DE;
  --ink-800: #F2F1ED;
  --ink-900: #FAFAF8;
}
[data-theme="dark"] body { background: var(--ink-0); color: var(--ink-700); }
[data-theme="dark"] .site-header { background: rgba(14,13,11,.82); border-bottom-color: var(--ink-100); }
[data-theme="dark"] .btn-primary { background: var(--ink-900); color: var(--ink-0); }