/* --- INDIANA STATE UNIVERSITY THEME --- */
:root {
    --isu-blue: #00437a;      /* Official ISU Sycamore Blue */
    --isu-white: #ffffff;
    --isu-silver: #a2aab0;    /* Metallic Silver Accent */
    --isu-dark-blue: #002d52; /* Deep Navy for backgrounds */
    --text-main: #f8f9fa;
    --text-muted: #d1d8dd;
}

body {
    background: var(--isu-dark-blue);
    background-image: linear-gradient(180deg, var(--isu-dark-blue) 0%, #001a30 100%);
    color: var(--text-main);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* --- NAVIGATION --- */
.nav-header {
    padding: 25px 5%;
    background: rgba(0, 0, 0, 0.2);
    border-bottom: 3px solid var(--isu-blue);
}

.btn-isu {
    display: inline-flex;
    align-items: center;
    padding: 10px 24px;
    border-radius: 4px; /* More "Engineering" block style than pill */
    background: var(--isu-blue);
    border: 1px solid var(--isu-silver);
    color: white;
    text-decoration: none;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.2s ease;
}

.btn-isu:hover {
    background: var(--isu-white);
    color: var(--isu-blue);
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.3);
}

/* --- PROJECT CONTAINER --- */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 20px;
    text-align: center;
}

.project-title h1 {
    font-size: 2.8rem;
    color: var(--isu-white);
    border-bottom: 4px solid var(--isu-blue);
    display: inline-block;
    padding-bottom: 10px;
    margin-bottom: 15px;
}

/* --- 3D VIEWER GALLERY --- */
.gallery-card {
    background: #000; /* Darker background for the model to pop */
    border: 2px solid var(--isu-silver);
    border-radius: 8px;
    position: relative;
    height: 65vh;
    margin-top: 20px;
    box-shadow: 0 15px 50px rgba(0,0,0,0.8);
}

model-viewer {
    width: 100%;
    height: 100%;
}

/* ISU Style Navigation Arrows */
.nav-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: var(--isu-blue);
    color: white;
    border: 1px solid var(--isu-silver);
    width: 50px;
    height: 50px;
    cursor: pointer;
    z-index: 5;
    transition: 0.3s;
    font-size: 1.5rem;
}

.nav-arrow:hover {
    background: var(--isu-white);
    color: var(--isu-blue);
}

.prev { left: 0; border-radius: 0 5px 5px 0; }
.next { right: 0; border-radius: 5px 0 0 5px; }

/* --- INFO PANEL --- */
.info-panel {
    margin-top: 30px;
    background: rgba(255, 255, 255, 0.05);
    padding: 30px;
    border-radius: 8px;
    border-top: 4px solid var(--isu-blue);
    text-align: left;
}

.info-panel h3 {
    color: var(--isu-blue);
    background: var(--isu-white);
    display: inline-block;
    padding: 5px 15px;
    border-radius: 3px;
    margin-top: 0;
}

.status-indicator {
    display: inline-block;
    width: 12px;
    height: 12px;
    background: #27ae60;
    border-radius: 2px;
    margin-right: 8px;
}