/* ========================================
   ICHI DESIGN - Shared Reset & Utilities
   ======================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
  list-style: none;
}

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

/* ========================================
   SAMPLE Ribbon - 全ページ共通
   ======================================== */
.sample-ribbon {
  position: fixed;
  top: 30px;
  right: -40px;
  z-index: 9999;
  background: #E53E3E;
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 6px 50px;
  transform: rotate(45deg);
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
  pointer-events: none;
}

/* ========================================
   Hamburger Menu (CSS Only) - 全ページ共通
   ======================================== */
.menu-toggle {
  display: none;
  width: 28px;
  height: 20px;
  position: relative;
  cursor: pointer;
  z-index: 1001;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  position: absolute;
  transition: all 0.3s ease;
}

.menu-toggle span:nth-child(1) { top: 0; }
.menu-toggle span:nth-child(2) { top: 9px; }
.menu-toggle span:nth-child(3) { top: 18px; }

.menu-checkbox {
  display: none;
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
}