/* ========================================
   Base — Reset, Typography, Globals
======================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Noto+Sans+JP:wght@300;400;500;700&family=Noto+Serif+JP:wght@400;500;600;700&display=swap');

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--text);
  background-color: var(--bg);
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  line-height: var(--lh-heading);
  letter-spacing: var(--ls-heading);
  color: var(--text);
  font-weight: var(--fw-medium);
}

h1 {
  font-size: var(--fs-h1);
  margin-bottom: var(--space-md);
}

h2 {
  font-size: var(--fs-h2);
  margin-bottom: var(--space-md);
}

h3 {
  font-size: var(--fs-h3);
  margin-bottom: var(--space-sm);
}

p {
  margin-bottom: var(--space-sm);
  color: var(--text-muted);
}

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

a:hover {
  color: var(--primary-dark);
}

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

ul, ol {
  list-style: none;
}

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

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

/* Utility — layout breathing */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

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

.section {
  padding: var(--space-3xl) 0; /* 8px grid; more white space between sections */
}

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

.section--tight {
  padding: var(--space-xl) 0;
}

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

/* Section headers — centered with breathing room */
.section__header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.section__label {
  display: inline-block;
  font-family: var(--font-en);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--primary);
  background: var(--primary-light);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-sm);
}

.section__title {
  font-size: var(--fs-h2);
  margin-bottom: var(--space-sm);
  font-weight: 600;
}

.section__subtitle {
  font-size: var(--fs-body);
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: var(--lh-body);
}

/* Text alignment */
.text-center { text-align: center; }
.text-left   { text-align: left; }

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

/* Divider — subtle */
.divider {
  border: none;
  height: 1px;
  background: var(--border-light);
  margin: var(--space-xl) 0;
}

/* Selection */
::selection {
  background: var(--primary-light);
  color: var(--primary-dark);
}