:root {
    --primary-color: #003366; /* Dark Blue */
    --accent-color: #6699cc;
    --text-color: #333;
    --bg-color: #fff;
    --light-bg: #f4f4f4;
    --max-width: 1000px;
}

body {
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    margin: 0;
    padding: 0;
    color: var(--text-color);
    line-height: 1.6;
}

header {
    background-color: var(--primary-color);
    color: #fff;
    padding: 1rem 0;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

h1.site-title {
    margin: 0;
    font-size: 1.5rem;
}

h1.site-title a {
    color: #fff;
    text-decoration: none;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}

nav ul li a:hover {
    text-decoration: underline;
}

main {
    padding: 40px 0;
    min-height: 60vh;
}

section {
    margin-bottom: 40px;
}

h2 {
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
    color: var(--primary-color);
}

footer {
    background-color: #eee;
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
    font-size: 0.9rem;
}

/* News List */
.news-list {
    list-style: none;
    padding: 0;
}

.news-list li {
    border-bottom: 1px solid #ddd;
    padding: 10px 0;
    display: flex;
    flex-wrap: wrap;
}

.news-date {
    font-weight: bold;
    margin-right: 15px;
    color: #666;
    min-width: 100px;
}

.news-category {
    background-color: var(--accent-color);
    color: #fff;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    margin-right: 15px;
    height: fit-content;
}

.news-title a {
    color: var(--primary-color);
    text-decoration: none;
}

.news-title a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    .header-inner {
        flex-direction: column;
        align-items: flex-start;
    }
    
    nav ul {
        margin-top: 10px;
        flex-wrap: wrap;
    }
    
    nav ul li {
        margin-left: 0;
        margin-right: 15px;
    }
}

/* Allow wider container on large screens so member cards can expand */
@media (min-width: 1200px) {
    .container { max-width: 1400px; }
}

/* allow slightly wider container earlier so members grid can use more width on typical desktops */
@media (min-width: 1000px) {
    .container { max-width: 1200px; }
}

.members-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}
@media (max-width: 900px) {
  .members-grid { grid-template-columns: 1fr; }
}

/* グループごとの見分け（背景色） */
.member-card.group-takaki {
  background: #f3f8ff;           /* 薄い青 */
  border-left: 6px solid #6699cc;
}
.member-card.group-ambe {
  background: #f2fbf4;           /* 薄い緑 */
  border-left: 6px solid #5fae7a; /* 緑系ライン */
}

/* カードがgrid gapで整うように（既存marginを無効化） */
.member-card { margin-bottom: 0 !important; }

/* Sticky header + two-line title (added for local/GitHub Pages) */
header {
    position: fixed; /* �� sticky �ł͂Ȃ� fixed */
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.12);
}

body {
    padding-top: var(--header-h, 0px);
}

.site-title{ margin:0; line-height:1.15; }
.site-title-link{ color:#fff; text-decoration:none; display:inline-block; }
.site-affiliation{ display:block; font-size:.85rem; font-weight:500; opacity:.92; letter-spacing:.02em; }
.site-labname{ display:block; margin-top:4px; font-size:1.45rem; font-weight:700; }

html{ scroll-padding-top: 90px; }
@media (max-width: 768px){
  .site-affiliation{ font-size:.78rem; }
  .site-labname{ font-size:1.15rem; }
}