/*
 * マルチバース百合教会 - Modern CSS
 * 2025 Redesign
 */

/* ===== CSS Variables ===== */
:root {
  --color-primary: #c51147;
  --color-primary-dark: #a00e3a;
  --color-secondary: #ec6a8d;
  --color-background: #ffffff;
  --color-surface: #f8f9fa;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-border: #e0e0e0;

  --font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "BIZ UDPGothic", Meiryo, sans-serif;
  --font-size-base: 16px;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  --max-width: 1200px;
  --header-height: 60px;
  --border-radius: 8px;
  --transition: 0.3s ease;
}

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul, ol {
  list-style: none;
}

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

.section {
  padding: var(--spacing-2xl) 0;
}

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

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
}

.header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.header__logo {
  font-size: var(--font-size-lg);
  font-weight: bold;
  color: var(--color-primary);
}

.header__logo img {
  height: 32px;
  width: auto;
}

/* ===== Navigation ===== */
.nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.nav__list {
  display: flex;
  gap: var(--spacing-sm);
}

.nav__link {
  display: block;
  padding: var(--spacing-xs) var(--spacing-sm);
  color: var(--color-text);
  font-weight: 500;
  border-radius: var(--border-radius);
  transition: all var(--transition);
}

.nav__link:hover {
  color: var(--color-primary);
  background-color: var(--color-surface);
}

.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.nav__toggle-icon {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  position: relative;
}

.nav__toggle-icon::before,
.nav__toggle-icon::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  left: 0;
}

.nav__toggle-icon::before {
  top: -7px;
}

.nav__toggle-icon::after {
  bottom: -7px;
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .nav__toggle {
    display: block;
  }

  .nav__list {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    background-color: var(--color-background);
    padding: var(--spacing-lg);
    gap: var(--spacing-sm);
    transform: translateX(100%);
    transition: transform var(--transition);
  }

  .nav__list.is-open {
    transform: translateX(0);
  }

  .nav__link {
    font-size: var(--font-size-lg);
    padding: var(--spacing-sm);
  }
}

/* ===== Hero ===== */
.hero {
  padding-top: calc(var(--header-height) + var(--spacing-2xl));
  padding-bottom: var(--spacing-2xl);
  text-align: center;
}

.hero__logo {
  max-width: 500px;
  margin: 0 auto var(--spacing-lg);
}

.hero__description {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== Section Heading ===== */
.section__heading {
  font-size: var(--font-size-2xl);
  font-weight: bold;
  margin-bottom: var(--spacing-lg);
  position: relative;
  padding-bottom: var(--spacing-sm);
}

.section__heading::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background-color: var(--color-primary);
}

.section__heading--center {
  text-align: center;
}

.section__heading--center::after {
  left: 50%;
  transform: translateX(-50%);
}

/* ===== Posts List ===== */
.posts {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.post-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  transition: background-color var(--transition);
}

.post-item:hover {
  background-color: var(--color-surface);
}

.post-item__title {
  font-weight: 500;
  color: var(--color-text);
}

.post-item__date {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

.post-item a {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  color: inherit;
  text-decoration: none;
}

.post-item a .post-item__title {
  color: var(--color-text);
  transition: color var(--transition);
}

.post-item a:hover .post-item__title {
  color: var(--color-primary);
}

@media (min-width: 768px) {
  .post-item {
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-md);
  }

  .post-item a {
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-md);
    flex: 1;
  }

  .post-item__date {
    flex-shrink: 0;
    order: -1;
  }

  .post-item a .post-item__date {
    order: -1;
  }
}

/* ===== Videos ===== */
.videos {
  display: grid;
  gap: var(--spacing-lg);
}

@media (min-width: 768px) {
  .videos {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .videos {
    grid-template-columns: repeat(3, 1fr);
  }
}

.video-item {
  position: relative;
  padding-bottom: 56.25%;
  border-radius: var(--border-radius);
  overflow: hidden;
  background-color: var(--color-surface);
}

.video-item iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* ===== Activities ===== */
.activities {
  display: grid;
  gap: var(--spacing-lg);
}

@media (min-width: 768px) {
  .activities {
    grid-template-columns: repeat(2, 1fr);
  }
}

.activity-card {
  background-color: var(--color-surface);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}

.activity-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.activity-card__title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
}

/* ===== Button ===== */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-primary);
  color: #fff;
  font-weight: 500;
  border-radius: 50px;
  transition: all var(--transition);
  border: 2px solid var(--color-primary);
}

.btn:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #fff;
}

.btn--outline {
  background-color: transparent;
  color: var(--color-primary);
}

.btn--outline:hover {
  background-color: var(--color-primary);
  color: #fff;
}

/* ===== Gallery ===== */
.gallery {
  display: grid;
  gap: var(--spacing-sm);
  grid-template-columns: repeat(2, 1fr);
}

@media (min-width: 768px) {
  .gallery {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .gallery {
    grid-template-columns: repeat(5, 1fr);
  }
}

.gallery__item {
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: var(--border-radius);
  cursor: pointer;
}

.gallery__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}

.gallery__item:hover img {
  transform: scale(1.05);
}

/* ===== Footer ===== */
.footer {
  background-color: var(--color-text);
  color: #fff;
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.footer__copy {
  font-size: var(--font-size-sm);
  opacity: 0.8;
}

/* ===== Utilities ===== */
.text-center {
  text-align: center;
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

/* ===== Contact Page ===== */
.contact-info {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.contact-info p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-light);
}

/* ===== Accessibility ===== */
.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;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ===== Print ===== */
@media print {
  .header,
  .nav {
    display: none;
  }

  .hero {
    padding-top: var(--spacing-lg);
  }
}