/* ================= 覆盖层 ================= */
/* 统一变量，方便以后一键改主题色 */
:root{
    --cardW: 310px;          /* 卡片宽度 */
    --cardH: 420px;          /* 卡片高度 */
    --radius: 16px;          /* 圆角 */
    --transD: .5s;           /* 翻转时长 */
    --prime: rgba(125,125,125,0.3);        /* Freiburg 主色（蓝紫） */
    --txt: #2d2d2d;
}

/* 1. 页面背景改为浅灰，避免大片黑色压抑 */
body{
    padding: 3rem 1rem;
    font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial;
}

/* 2. 所有卡片父容器：居中 + 统一间距 */
.student-leader,
.student-art,
.student-drylab,
.student-wetlab,
.advisors,
.student-hp,
.pi,
.ins,
.pi-primary,
.pi-secondary{
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2.5rem;
    padding: 2rem 0;
}

/* 3. 卡片外壳：固定尺寸 + 3D 空间 */
.member-card{
    width: var(--cardW);
    height: var(--cardH);
    position: relative;
    transform-style: preserve-3d;
    transition: transform var(--transD) cubic-bezier(.4,0,.2,1);
    cursor: pointer;
    flex: 0 0 var(--cardW);
    will-change: transform;
}
.member-card:hover{ transform: rotateY(180deg); }

/* 4. 正反面通用 */
#m_card_front,
#m_card_back{
    position: absolute;
    inset: 0;
    border-radius: var(--radius);
    overflow: hidden;
    backface-visibility: hidden;
    box-shadow: 0 8px 24px rgba(0,0,0,.12);
}

/* 5. 正面：图片满版 + 底部渐变遮罩 + 文字 */
#m_card_front{
    background: #fff;
}
.front-img,
.front-img img{
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.front-content{
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 1.2rem 1rem;
    background: linear-gradient(to top, rgba(0,0,0,.7) 0%, transparent 100%);
    color: #fff;
}
.front-content h3{
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: .5px;
}

/* 6. 背面：分上下两半，上 45% 头像，下 55% 文字 */
#m_card_back{
    background: linear-gradient(135deg, var(--prime) 0%, #9b7fd4 100%);
    transform: rotateY(180deg);
    display: flex;
    flex-direction: column;
    color: #fff;
}
.back-img{
    height: 45%;
    display: flex;
    align-items: center;
    justify-content: center;
}
.back-img img{
    width: 110px;
    height: 110px;
    border-radius: 50%;
    border: 3px solid #fff;
    object-fit: cover;
    box-shadow: 0 4px 12px rgba(0,0,0,.15);
}
.back-content{
    height: 55%;
    padding: 1.2rem 1.4rem 1.4rem;
    overflow: auto;
    font-size: .95rem;
    line-height: 1.65;
    text-align: center;
}
.back-content p{
    margin: 0;
    color: rgba(255,255,255,.92);
}

/* 7. 修复原拼写错误（calss→class） */
.pi-secondary{ display: flex; flex-wrap: wrap; justify-content: center; }



/* ========= 磨砂玻璃框 ========= */
.student-leader,
.student-wetlab,
.student-drylab,
.student-hp,
.student-art,
.pi,
.ins,
.pi-primary,
.pi-secondary,
.advisors,
.hp{
    position: relative;          /* 为标题定位提供包含块 */
    width: 100%;
    margin: 3rem 0;              /* 上下留呼吸空间 */
    padding: 3.5rem 1rem 2.5rem; /* 上方多留 3.5 rem 给标题 */
    background: rgba(255,255,255,.08);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,.12);
    box-shadow: 0 8px 32px rgba(0,0,0,.15);
}

/* ========= 标题通用 ========= */
.student-leader::before,
.student-wetlab::before,
.student-drylab::before,
.student-hp::before,
.advisors::before,
.student-art::before,
.pi-primary::before,
.pi-secondary::before,
.ins::before{
    content: attr(data-title);   /* 之后在 HTML 里给 section 加 data-title="xxx" 即可 */
    position: absolute;
    top: -4rem;                  /* 刚好骑在玻璃框上边缘 */
    left: 50%;
    transform: translateX(-50%);
    /* 直接套用你现成的 lavender-text 样式 */
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: .1em;
    background: linear-gradient(45deg,#b794f6,#5220b8,#501dbd);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: textFlow 8s ease-in-out infinite;
    text-shadow: 0 2px 10px rgba(183,148,246,.3);
    z-index: 2;
}
.student-leader::after,
.pi::after,
.ad-primary::after,
.ad-secondary::after{
    /* 发光层 */
    content: attr(data-title);
    position: absolute;
    top: -2rem;
    left: 50%;
    transform: translateX(-50%);
    background: inherit;
    -webkit-background-clip: text;
    background-clip: text;
    filter: blur(15px);
    opacity: .7;
    z-index: -1;
    animation: pulse 3s infinite alternate;
}

/* ========= 动画保持原封不动 ========= */
@keyframes textFlow{
    0%,100%{ background-position: 0% 50%; }
    50%{ background-position: 100% 50%; }
}
@keyframes pulse{
    0%{ opacity: .5; transform: translateX(-50%) scale(1); }
    100%{ opacity: .8; transform: translateX(-50%) scale(1.05); }
}




/* ===== 追加 ===== */
.hello-card{
    --cardW:280px;
    --cardH:420px;
    width:var(--cardW);
    height:var(--cardH);
    flex:0 0 var(--cardW);
    position:relative;
    border-radius:16px;
    overflow:hidden;
    box-shadow:0 8px 24px rgba(0,0,0,.12);
}
.hello-card img{
    width:100%;height:100%;object-fit:cover;display:block;vertical-align: middle;
  /* 兜底：强制图片不小于容器尺寸 */
  min-width: 100%;
  min-height: 100%;
}

.hello-card > div:nth-of-type(2) {
  width: 100%;
  height: 100%;
  /* 清除默认margin/padding，避免留白 */
  margin: 0;
  padding: 0;
}



/* 玻璃条：只包职务p+h4+研究方向p */
.hello-card .mem-glass-bar{
    position:absolute;
    left:0;right:0;bottom:0;
    transform:translateY(100%);
    transition:transform .35s ease-out;
    background:rgba(255,255,255,.45);
    border-top:1px solid rgba(255,255,255,.35);
    padding:clamp(.8rem,3vw,1.2rem) clamp(.6rem,2.5vw,1rem);
    text-align:center;
    color:#222;
}
.hello-card:hover .mem-glass-bar{
    transform:translateY(0);
}

/* 三段文字 */
.mem-glass-bar .role{
    font-size:clamp(.75rem,2.2vw,.95rem);
    margin:0 0 .3rem;
    color:#555;
}
.mem-glass-bar h4{
    font-size:clamp(.8rem,2.5vw,1rem);
    font-weight:600;
    margin:0 0 .2rem;
    color:#000;
}
.mem-glass-bar .interest{
    font-size:clamp(.7rem,2vw,.85rem);
    margin:0;
    color:#444;
}

/* 桌面端字略大 */
@media (min-width:768px){
    .mem-glass-bar .role{font-size:.9rem;}
    .mem-glass-bar h4{font-size:1.05rem;}
    .mem-glass-bar .interest{font-size:.8rem;}
}

.hello-card h3{font-size:2.7rem;font-weight:900;margin:0 0 .2rem;}
.hello-card>div:nth-of-type(1){
    position:absolute;left:0;top:79%;
    transform:translateY(-50%);
    width:50%;padding:.6rem .8rem;
    border-bottom:none;
    color:gold;
}