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

:root {
  --color-primary: #0b5fa5;
  --color-primary-dark: #084a82;
  --color-primary-light: #e8f2fc;
  --color-accent: #f39c12;
  --color-text: #333;
  --color-text-light: #666;
  --color-bg: #fff;
  --color-bg-gray: #f7f7f7;
  --color-border: #e0e0e0;
  --font-family: "Helvetica Neue", "Noto Sans JP", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  --max-width: 1100px;
  --header-height: 70px;
  --radius: 8px;
  --radius-sm: 4px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  font-size: 16px;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}

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

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

ul {
  list-style: none;
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.header-logo {
  font-size: 16px;
  font-weight: bold;
  color: var(--color-primary);
  white-space: nowrap;
}

.header-logo a {
  color: inherit;
}

.nav-menu {
  display: flex;
  gap: 32px;
}

.nav-menu-spacer,
.nav-menu-footer {
  display: none;
}

.nav-menu a {
  color: var(--color-text);
  font-size: 15px;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.3s;
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 100%;
}

.nav-menu a:hover {
  color: var(--color-primary);
}

/* Hamburger (mobile) */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
  margin-left: auto;
  margin-right: 0;
  z-index: 1002;
  position: relative;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.3s, opacity 0.3s;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  height: 70vh;
  min-height: 400px;
  max-height: 600px;
  background:
    linear-gradient(135deg, rgb(185 207 224 / 75%) 0%, rgba(26, 143, 209, 0.65) 50%, rgba(43, 179, 224, 0.6) 100%),
    url('../images/hero.webp') center/cover no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  margin-top: var(--header-height);
  overflow: hidden;
}

/* Wind line pattern (shared base) */
.hero::before,
.page-header::before,
.wind-pattern::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

/* White wind lines (on blue backgrounds) */
.hero::before,
.page-header::before {
  background:
    repeating-linear-gradient(-15deg, transparent, transparent 40px, rgba(255, 255, 255, 0.05) 40px, rgba(255, 255, 255, 0.05) 42px),
    repeating-linear-gradient(-15deg, transparent, transparent 80px, rgba(255, 255, 255, 0.07) 80px, rgba(255, 255, 255, 0.07) 83px),
    repeating-linear-gradient(-15deg, transparent, transparent 150px, rgba(255, 255, 255, 0.04) 150px, rgba(255, 255, 255, 0.04) 154px);
}

.hero::before {
  z-index: 1;
}

/* Blue wind lines (on white backgrounds) */
.wind-pattern {
  position: relative;
}

.wind-pattern::before {
  background:
    repeating-linear-gradient(-15deg, transparent, transparent 40px, rgba(11, 95, 165, 0.03) 40px, rgba(11, 95, 165, 0.03) 42px),
    repeating-linear-gradient(-15deg, transparent, transparent 80px, rgba(11, 95, 165, 0.04) 80px, rgba(11, 95, 165, 0.04) 83px),
    repeating-linear-gradient(-15deg, transparent, transparent 150px, rgba(11, 95, 165, 0.02) 150px, rgba(11, 95, 165, 0.02) 154px);
}

.wind-pattern > * {
  position: relative;
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 0 24px;
}

.hero-logo-text {
  font-size: 14px;
  letter-spacing: 0.15em;
  opacity: 0.85;
  margin-bottom: 8px;
  font-weight: 400;
}

.hero-title {
  font-size: 36px;
  font-weight: bold;
  margin-bottom: 16px;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.hero-subtitle {
  font-size: 18px;
  opacity: 0.9;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}

/* Wave SVG */
.wave-area {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: 1;
}

.waves {
  display: block;
  width: 100%;
  height: 60px;
}

.parallax > use {
  animation: wave 25s cubic-bezier(0.55, 0.5, 0.45, 0.5) infinite;
}

.parallax > use:nth-child(1) {
  animation-delay: -2s;
  animation-duration: 7s;
}

.parallax > use:nth-child(2) {
  animation-delay: -3s;
  animation-duration: 10s;
}

.parallax > use:nth-child(3) {
  animation-delay: -4s;
  animation-duration: 13s;
}

.parallax > use:nth-child(4) {
  animation-delay: -5s;
  animation-duration: 20s;
}

@keyframes wave {
  0% {
    transform: translate3d(-90px, 0, 0);
  }
  100% {
    transform: translate3d(85px, 0, 0);
  }
}

/* ===== Sections ===== */
.section {
  padding: 80px 24px;
}

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

.section-title {
  text-align: center;
  font-size: 28px;
  font-weight: bold;
  color: var(--color-primary);
  margin-bottom: 48px;
  position: relative;
}

.section-title::after {
  content: "";
  display: block;
  width: 60px;
  height: 3px;
  background: var(--color-accent);
  margin: 12px auto 0;
}

.inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

/* ===== Page Header (sub pages) ===== */
.page-header {
  background: linear-gradient(135deg, #0b5fa5 0%, #1a8fd1 100%);
  color: #fff;
  padding: 0 24px;
  padding-top: calc(var(--header-height) + 40px);
  padding-bottom: 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-header > * {
  position: relative;
  z-index: 1;
}

.page-header h1,
.page-header p {
  font-size: 32px;
  font-weight: bold;
  margin: 0;
  line-height: 1.3;
}

/* ===== Cards ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.card-grid--pair {
  grid-template-columns: repeat(auto-fit, minmax(280px, 380px));
  justify-content: center;
}

/* ===== Year Group (activities list) ===== */
.year-group {
  margin-bottom: 64px;
  scroll-margin-top: calc(var(--header-height) + 16px);
}

.card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card,
.card:hover {
  color: var(--color-text);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.card-thumb {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
}

.card-body {
  padding: 20px;
}

.card-body h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.card-body p {
  color: var(--color-text-light);
  font-size: 14px;
}

.card-date {
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 4px;
}

.card-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 8px;
}

.card-tag {
  display: inline-block;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 12px;
  padding: 2px 10px;
  border-radius: 12px;
  margin-bottom: 8px;
}

.card-tag-list .card-tag {
  margin-bottom: 0;
}

.card-tag--release {
  background: #e8f2fc;
  color: #0b5fa5;
}

.card-tag--cleanup {
  background: #e6f4ea;
  color: #1e7e34;
}

.card-tag--event {
  background: #fff4e0;
  color: #b86e00;
}

/* ===== Member List ===== */
.member-area {
  margin-bottom: 48px;
}

.member-area h3 {
  font-size: 22px;
  color: var(--color-primary);
  border-left: 4px solid var(--color-accent);
  padding-left: 12px;
  margin-bottom: 20px;
}

.member-area h3 small {
  font-weight: normal;
  font-size: 14px;
  color: var(--color-text-light);
}

.member-item .url a {
  display: inline-block;
  margin-top: 4px;
  color: var(--color-primary);
  font-size: 13px;
  word-break: break-all;
}

.member-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.member-item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 20px;
}

.member-item h4 {
  font-size: 16px;
  margin-bottom: 4px;
}

.member-item .tel {
  font-size: 14px;
  color: var(--color-text-light);
}


/* ===== About / Board Members ===== */
.table-responsive {
  overflow-x: auto;
  max-width: 880px;
  margin: 0 auto;
}

.board-table {
  width: 100%;
  border-collapse: collapse;
}

.board-table td[data-label="役職"] {
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
}

.board-table th,
.board-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  font-size: 16px;
}

.board-table th {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 600;
  white-space: nowrap;
}

.board-table tr:hover {
  background: var(--color-bg-gray);
}

/* ===== Activity Detail ===== */
.article {
  max-width: 800px;
  margin: 0 auto;
}

.article h1 {
  font-size: 28px;
  margin-bottom: 8px;
}

.article-meta {
  color: var(--color-text-light);
  font-size: 14px;
  margin-bottom: 32px;
}

.article-body {
  line-height: 2;
}

.article-body p {
  margin-bottom: 16px;
}

.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
  margin: 24px 0;
}

.photo-grid img {
  border-radius: var(--radius-sm);
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}

.article-placeholder {
  background: #f7f9fb;
  border: 1px dashed #c6d4e1;
  padding: 24px;
  text-align: center;
  color: var(--color-text-light);
  border-radius: var(--radius-sm);
  margin: 24px 0;
  font-size: 14px;
}

/* ===== About sub-sections ===== */
.about-section {
  max-width: 700px;
  margin: 0 auto;
}

.about-section h3 {
  color: var(--color-primary);
  margin-bottom: 16px;
  font-size: 20px;
  border-left: 4px solid var(--color-accent);
  padding-left: 12px;
}

.about-section p + h3 {
  margin-top: 48px;
}

.about-section p {
  margin-bottom: 24px;
}

/* ===== Contact ===== */
.map-container {
  max-width: 600px;
  margin: 0 auto;
}

.map-container iframe {
  border: 0;
  border-radius: var(--radius);
}

.contact-info {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  max-width: 600px;
  margin: 0 auto;
}

.contact-info dt {
  font-weight: bold;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.contact-info dd {
  margin-bottom: 20px;
  font-size: 15px;
}

/* ===== Footer ===== */
.footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.8);
  padding: 40px 24px;
  text-align: center;
}

.footer-name {
  font-size: 16px;
  font-weight: bold;
  color: #fff;
  margin-bottom: 8px;
}

.footer-address {
  font-size: 13px;
  margin-bottom: 4px;
}

.footer a {
  color: rgba(255, 255, 255, 0.9);
}

.footer a:hover {
  color: #fff;
}

.footer-copyright {
  margin-top: 24px;
  font-size: 12px;
  opacity: 0.6;
}

/* ===== Intro (top page) ===== */
.intro-text {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 40px;
  font-size: 16px;
  line-height: 2;
  color: var(--color-text);
}

/* ===== Stats ===== */
.stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-bottom: 32px;
}

.stat-item {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 48px;
  font-weight: bold;
  color: var(--color-primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 14px;
  color: var(--color-text-light);
}

/* ===== Link buttons ===== */
.btn {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 10px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  transition: background 0.2s;
}

.btn:hover {
  background: var(--color-primary-dark);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}

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

.mt-32 {
  margin-top: 32px;
}

.mt-48 {
  margin-top: 48px;
}
.mb-48 {
  margin-bottom: 48px;
}

.article-body .section-title {
  margin-top: 64px;
}

/* ===== Article Nav (prev/next) ===== */
.article-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.article-nav a {
  font-size: 14px;
  color: var(--color-primary);
}

.article-nav .prev::before {
  content: "\2190 ";
}

.article-nav .next::after {
  content: " \2192";
}

/* ===== Nav Overlay ===== */
.nav-overlay {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 998;
}

.nav-overlay.open {
  display: block;
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 20px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
  z-index: 999;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--color-primary-dark);
}

/* ===== Responsive ===== */
@media (min-width: 768px) and (max-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  .header {
    padding: 0 16px;
  }

  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    right: -300px;
    width: 300px;
    max-width: 85vw;
    height: calc(100vh - var(--header-height));
    background: #fff;
    flex-direction: column;
    gap: 0;
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.15);
    transition: right 0.3s ease;
    padding: 8px 0 24px;
    margin: 0;
    z-index: 999;
    display: flex;
    overflow-y: auto;
  }

  .nav-menu.open {
    right: 0;
  }

  .nav-menu li {
    width: 100%;
    list-style: none;
  }

  .nav-menu-spacer,
  .nav-menu-footer {
    display: block;
  }

  .nav-menu li.nav-menu-spacer {
    flex: 1;
  }

  .nav-menu li.nav-menu-footer {
    padding: 20px 24px 8px;
    font-size: 12px;
    color: var(--color-text-light);
    line-height: 1.6;
    text-align: center;
  }

  .nav-menu li.nav-menu-footer a {
    display: inline;
    padding: 0;
    border: none;
    font-size: 12px;
    color: var(--color-primary);
  }

  .nav-menu a {
    display: block;
    width: 100%;
    padding: 18px 28px;
    border-bottom: 1px solid var(--color-border);
    font-size: 16px;
    font-weight: 500;
    color: var(--color-text);
    text-align: left;
  }

  .nav-menu a {
    position: relative;
  }

  .nav-menu a.active {
    color: var(--color-primary);
    background: var(--color-primary-light);
  }

  .nav-menu a.active::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--color-primary);
  }

  .nav-menu a::after {
    display: none;
  }

  .hero {
    height: 50vh;
    min-height: 300px;
  }

  .hero-title {
    font-size: 24px;
  }

  .hero-subtitle {
    font-size: 15px;
  }

  .section {
    padding: 48px 16px;
  }

  .section-title {
    font-size: 22px;
    margin-bottom: 32px;
  }

  .page-header {
    padding-top: calc(var(--header-height) + 32px);
    padding-bottom: 32px;
    padding-left: 16px;
    padding-right: 16px;
  }

  .page-header h1,
  .page-header p {
    font-size: 24px;
  }

  .header-logo {
    font-size: 14px;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .member-list {
    grid-template-columns: 1fr;
  }

  /* Board table → card layout on mobile */
  .board-table,
  .board-table thead,
  .board-table tbody,
  .board-table th,
  .board-table td,
  .board-table tr {
    display: block;
  }

  .board-table thead {
    display: none;
  }

  .board-table tr {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 12px;
  }

  .board-table td {
    border: none;
    padding: 4px 0;
    font-size: 16px;
  }

  .board-table td::before {
    content: attr(data-label);
    font-weight: 600;
    color: var(--color-primary);
    margin-right: 8px;
    font-size: 13px;
  }

  .board-table tr:hover {
    background: #fff;
  }

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

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}