/*
Theme Name: SEIKOU 3rd Phase
Theme URI: https://example.com/
Author: SEIKOU
Description: Classic WordPress theme skeleton for SEIKOU 3rd Phase.
Version: 0.1.0
Text Domain: seikou-3rd-phase
*/

:root {
  --color-bg: #ffffff;
  --color-surface: #f7f7f5;
  --color-text: #111111;
  --color-muted: #666666;
  --color-border: #d9d9d6;
  --color-accent: #111111;
  --font-base: "Hiragino Kaku Gothic ProN", "Yu Gothic", "YuGothic", "Meiryo", sans-serif;
  --font-heading: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --container: 1200px;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4rem;
  --radius: 0.25rem;
  --line: 1px solid var(--color-border);
}

html {
  box-sizing: border-box;
}

*, *::before, *::after {
  box-sizing: inherit;
}

body {
  margin: 0;
  font-family: var(--font-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
}

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

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

a:hover {
  text-decoration: underline;
}

.site-container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.site-header,
.site-footer,
.section {
  border-bottom: var(--line);
}

.section {
  padding: var(--space-6) 0;
}

.section-title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 2vw, 2.5rem);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.section-subtitle {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.95rem;
  color: var(--color-muted);
}

.btn,
.wp-block-button__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 3rem;
  padding: 0.85rem 1.5rem;
  border: 1px solid var(--color-text);
  border-radius: 0;
  background: transparent;
  color: var(--color-text);
  font-family: var(--font-heading);
  letter-spacing: 0.04em;
  text-decoration: none;
}

.btn:hover,
.wp-block-button__link:hover {
  background: var(--color-text);
  color: var(--color-bg);
  text-decoration: none;
}

.grid {
  display: grid;
  gap: var(--space-3);
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.muted {
  color: var(--color-muted);
}

.card {
  border: var(--line);
  padding: var(--space-3);
  background: var(--color-bg);
}

.section-lead {
  max-width: 42rem;
  margin: 0 0 var(--space-4);
}

@media (max-width: 900px) {
  .grid-2,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}