.tab-content {
    display: none;
    padding: 20px;
    color:aliceblue;
}

#about {
    display: block;
}

html, body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    text-align: center;
    margin: 0;
    padding: 0;
    height: 100%;
    overflow-x: hidden;
}
#background-video,
#calendar-background-video {
    position: fixed;
    right: 0%;
    left: 0%;
    min-width: 100%;
    min-height: 100%;
    z-index: -1;
    object-fit: cover;
}
#top-line {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 95px;
    background-color: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    z-index: 10;
    display: flex;
    justify-content: flex-start;
    align-items:center;
    background-color: #1111;
    padding: 10px;
}

#top-line button {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    border-bottom: 2px solid #5b6fde;
    border-left: 2px solid #5b6fde; 
    border-right: 2px solid #5b6fde;
    border-top: transparent;
    color:#153dee;
    font-size: large;
    padding: 30px;
    margin: 30px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    background-color: transparent;
    transition: box-shadow 0.3s ease, background-color 0.3s ease;
}

#top-line button:hover {
    text-decoration: underline;
}

/* ── Calendar-themed top bar ──────────────────────────── */
#top-line.cal-theme {
    background-color: rgba(35,35,41,0.85);
    transition: background-color 0.4s ease;
}
#top-line.cal-theme button {
    border-bottom-color: #FBC4CC;
    border-left-color: #FBC4CC;
    border-right-color: #FBC4CC;
    color: #F4F2F5;
    transition: border-color 0.4s ease, color 0.4s ease;
}
#top-line.cal-theme #home-btn {
    filter: brightness(0) invert(1); /* makes a dark logo white */;
}

title {
    font-size: large;
    font-weight: 100;
    margin-bottom: auto;
    color:#000000;
}
h1 {
    font-size: 3rem;
    color: #000000;
    font-weight: bold;
    margin-top: 150px;
}
p {
    font-size: 2rem;
    color:rgb(0, 0, 0);
    max-width: 800px;
    margin: 0 auto 40px auto;
    line-height: 1.5;
}
img {
    display:block;
}