/* ============================================================
   base.css — Resets and Foundation
   B.I.Y Corporate Design System
   ============================================================ */

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

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

@media screen and (max-width: 768px) {
  html { scroll-padding-top: 80px; }
}

body {
  font-family: var(--font-sans-ja);
  font-size: var(--fs-base);
  font-weight: var(--fw-regular);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: var(--lh-normal);
  letter-spacing: var(--tracking-wide);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif-ja);
  color: var(--color-navy);
  line-height: var(--lh-tight);
  font-weight: var(--fw-bold);
  letter-spacing: var(--tracking-wide);
}

p {
  line-height: var(--lh-normal);
}

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

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

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

ul, ol {
  list-style: none;
}

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

::selection {
  background: var(--color-gold);
  color: var(--color-white);
}

/* ── Layout primitives ──────────────────────────────────── */
.container {
  width: 100%;
  max-width: calc(var(--container-width) + (var(--container-padding) * 2));
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.container--narrow {
  max-width: calc(var(--container-narrow) + (var(--container-padding) * 2));
}

.container--wide {
  max-width: calc(var(--container-wide) + (var(--container-padding) * 2));
}

.section {
  padding: var(--section-padding);
  position: relative;
}

.section--lg { padding: var(--section-padding-lg); }
.section--md { padding: var(--section-padding-md); }
.section--sm { padding: var(--section-padding-sm); }

.section--navy {
  background-color: var(--color-navy);
  color: var(--color-text-on-navy);
}

.section--navy-deep {
  background-color: var(--color-navy-deep);
  color: var(--color-text-on-navy);
}

.section--cream { background-color: var(--color-bg-cream); }
.section--bg { background-color: var(--color-bg); }
.section--white { background-color: var(--color-white); }

.section--navy h1,
.section--navy h2,
.section--navy h3,
.section--navy h4,
.section--navy-deep h1,
.section--navy-deep h2,
.section--navy-deep h3,
.section--navy-deep h4 {
  color: var(--color-white);
}

/* Geometric pattern for navy sections */
.section--navy::before,
.section--navy-deep::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(135deg, rgba(200, 168, 74, 0.03) 0%, transparent 45%),
    linear-gradient(45deg, transparent 60%, rgba(200, 168, 74, 0.04) 100%);
  pointer-events: none;
}

.section--navy > *,
.section--navy-deep > * {
  position: relative;
  z-index: 1;
}

/* ── Utility ────────────────────────────────────────────── */
.text-center { text-align: center; }
.text-gold { color: var(--color-gold); }
.text-navy { color: var(--color-navy); }
.text-white { color: var(--color-white); }

.serif-ja { font-family: var(--font-serif-ja); }
.sans-ja { font-family: var(--font-sans-ja); }
.serif-en { font-family: var(--font-serif-en); }
.sans-en { font-family: var(--font-sans-en); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ── Body lock when nav open ────────────────────────────── */
body.nav-open {
  overflow: hidden;
}