:root {
    --beamer-blue: #2B3D96;
    --beamer-shadow: 0 8px 25px rgba(0, 0, 0, 0.25);
    --green-logo: #5c9e1a;
}

body {
    margin: 0;
    padding: 0 0 60px 0;
    background-color: #ffffff;
    font-family: 'Latin Modern Sans', 'Helvetica', sans-serif;
    color: #1a1a1a;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.floating-header {
    z-index: 100;
    width: 92%;
    max-width: 1000px;
    margin: 15px auto 5px auto;
    background-color: var(--beamer-blue);
    color: white;
    padding: 1rem;
    border-radius: 12px;
    box-shadow: var(--beamer-shadow);
    text-align: center;
    font-family: 'Latin Modern Sans', 'Helvetica', sans-serif;
}
.floating-header h1 {
    margin: 0;
    font-size: 1.8rem;
    font-weight: normal;
}
.header-nav {
    margin: 0.3rem 0 0 0;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
}
.header-nav a {
    text-decoration: none;
    color: rgba(255, 255, 255, 0.75);
    padding: 5px 12px;
    border-radius: 6px	;
    transition: background-color 0.2s, color 0.2s;
    font-size: 1rem;
    font-weight: normal;
}
.header-nav a:hover {
    background-color: rgba(255, 255, 255, 0.15);
    color: white;
}

/* active header link (CSS-only, scoped by page body class) */
.page-index  .header-nav a[href="index.html"],
.page-demo-1 .header-nav a[href="demo-1.html"],
.page-demo-2 .header-nav a[href="demo-2.html"],
.page-demo-3 .header-nav a[href="demo-3.html"],
.page-home-2 .header-nav a[href="home-2.html"] {
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
}

.content-container {
    width: 92%;
    max-width: 1000px;
    text-align: center;
    line-height: 1.8;
    font-size: 1.2rem;
    padding: 0 0 2rem 0;
    min-height: 60vh;
}

.floating-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 40px;
    background-color: var(--beamer-blue);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 25px;
    box-sizing: border-box;
    font-family: 'Latin Modern Sans', 'Helvetica', sans-serif;
    font-size: 0.9rem;
    z-index: 100;
    box-shadow: 0 -2px 5px rgba(0,0,0,0.1);
}

.logo-bottom {
    position: fixed;
    bottom: 55px;
    right: 25px;
    width: 50px;
    height: auto;
    z-index: 99;
    fill: var(--green-logo);
}

/* ---------- utility: roman-box ---------- */

.roman-box {
    font-family: 'Latin Modern Roman', 'Times New Roman', serif;
    background: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    text-align: left;
}

/* ---------- page: index ---------- */

.page-index .demo-float-img {
    float: left;
    width: 200px;
    margin-right: 25px;
    margin-bottom: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.page-home-2 .demo-float-img {
    border-radius: 0;
    box-shadow: none;
}

.page-index .toc-item {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 40px;
    font-family: 'Latin Modern Sans', 'Helvetica', sans-serif;
    font-size: 1.6rem;
    cursor: default;
}

.page-index .toc-item.active .toc-num {
    background-color: var(--beamer-blue);
    color: white;
}
.page-index .toc-item.active .toc-text {
    color: var(--beamer-blue);
}

.page-index .toc-item.inactive .toc-num {
    background-color: #ececec;
    color: #c4c9d6;
}
.page-index .toc-item.inactive .toc-text {
    color: #c4c9d6;
}

.page-index .toc-num {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    font-size: 1.2rem;
    font-weight: bold;
}

.page-index .demo-text {
    text-align: left;
    margin-top: 1rem;
    border-top: 1px solid #ddd;
    padding-top: 1.5rem;
    font-size: 1rem;
}

.page-index .profiles-section {
    margin-top: 2.5rem;
    border-top: 1px solid #ddd;
    padding-top: 1.5rem;
    text-align: left;
}
.page-index .profiles-section h3 {
    color: var(--beamer-blue);
    font-family: 'Latin Modern Roman', 'Times New Roman', serif;
    margin-bottom: 0.75rem;
}
.page-index .profiles-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: flex-start;
    gap: 24px;
}
.page-index .profiles-list a {
    color: var(--beamer-blue);
    text-decoration: none;
    font-size: 1.1rem;
}
.page-index .profiles-list a:hover {
    text-decoration: underline;
}

/* ---------- page: demo-1 ---------- */

.page-demo-1 .card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 2rem;
}
.page-demo-1 .card {
    background: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    text-align: left;
}
.page-demo-1 .card h3 {
    margin-top: 0;
    color: var(--beamer-blue);
    font-family: 'Latin Modern Roman', 'Times New Roman', serif;
}
.page-demo-1 .card p {
    margin-bottom: 0;
}

/* ---------- page: demo-2 ---------- */

.page-demo-2 .two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 2rem;
    text-align: left;
}
.page-demo-2 .two-col .col {
    background: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 20px;
}
.page-demo-2 .two-col h3 {
    margin-top: 0;
    color: var(--beamer-blue);
    font-family: 'Latin Modern Roman', 'Times New Roman', serif;
}

/* ---------- page: demo-3 ---------- */

.page-demo-3 .timeline {
    position: relative;
    margin: 2rem 0;
    padding-left: 30px;
    border-left: 3px solid var(--beamer-blue);
}
.page-demo-3 .timeline-item {
    margin-bottom: 30px;
    position: relative;
}
.page-demo-3 .timeline-item::before {
    content: '';
    position: absolute;
    left: -38px;
    top: 5px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--green-logo);
    border: 2px solid white;
    box-shadow: 0 0 0 2px var(--beamer-blue);
}
.page-demo-3 .timeline-item h3 {
    margin: 0 0 5px 0;
    color: var(--beamer-blue);
    font-family: 'Latin Modern Roman', 'Times New Roman', serif;
}
.page-demo-3 .timeline-item p {
    margin: 0;
}

/* ---------- page: 404 ---------- */

.page-404 .error-code {
    font-size: 5rem;
    color: var(--beamer-blue);
    margin: 1rem 0;
    font-family: 'Latin Modern Sans', 'Helvetica', sans-serif;
}

/* ---------- responsive ---------- */

@media (max-width: 640px) {
    .floating-header {
        width: 92%;
        padding: 0.8rem;
    }
    .floating-header h1 {
        font-size: 1.2rem;
    }
    .floating-header .header-nav {
        flex-direction: column;
        align-items: center;
    }
    .floating-header .header-nav a {
        padding: 4px 8px;
        font-size: 0.9rem;
    }
    .content-container {
        width: 92%;
    }
    .floating-footer {
        flex-direction: column;
        height: auto;
        padding: 8px 15px;
        gap: 4px;
        font-size: 0.8rem;
    }
    .logo-bottom {
        width: 30px;
        bottom: auto;
        right: 10px;
    }
}