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

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

body {
  font-family: var(--font-ja);
  font-size: var(--text-base);
  font-weight: var(--font-weight-regular);
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-ja);
  color: var(--color-dark);
  background-color: var(--color-bg-page);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.menu-open {
  overflow: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

ul,
ol {
  list-style: none;
}

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

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

/* ========== TYPOGRAPHY - unified sans-serif ========== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-dark);
}

/* ========== LAYOUT - unified container ========== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.container--wide {
  max-width: var(--container-wide);
}

/* ========== SECTION COMMON ========== */
.section-label {
  font-family: var(--font-en);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--tracking-wider);
  color: var(--color-dark);
  text-transform: uppercase;
  display: block;
  margin-bottom: var(--space-4);
}

.section-header {
  margin-bottom: var(--space-16);
}

.section-title {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: var(--font-weight-black);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-8);
  line-height: var(--leading-tight);
  color: var(--color-dark);
}

.section-description {
  font-size: var(--text-base);
  color: var(--color-gray-500);
  line-height: var(--leading-relaxed);
  max-width: 560px;
}

/* ========== SELECTION ========== */
::selection {
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* ========== RISING PARTICLES BACKGROUND ========== */
.particles-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.particles-bg canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Disable on small screens for perf / visual noise */
@media (max-width: 767px) {
  .particles-bg { display: none !important; }
}