:root {
    --siemens-petrol: #005f6b;
    --siemens-dark: #00323c;
    --siemens-accent: #00ffb9;
    --text-yellow: #ffffff;
}

body {
    background-color: var(--siemens-dark);
    color: #ffffff;
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

header {
    width: 100%;
    text-align: center;
    padding: 20px 0;
    color: var(--siemens-accent);
    letter-spacing: 2px;
    font-size: 1.2rem;
    text-transform: uppercase;
}

/* User Selection Page */
.user-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
    width: 80%;
    max-width: 400px;
    margin-top: 50px;
}

.user-button {
    background-color: var(--siemens-petrol);
    color: white;
    border: 2px solid var(--siemens-accent);
    padding: 20px;
    font-size: 1.2rem;
    text-decoration: none;
    text-align: center;
    border-radius: 4px;
}

/* Bingo Grid */
.grid-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    width: 95vw;
    max-width: 600px;
    padding-bottom: 40px;
}

.card-container {
    aspect-ratio: 0.8 / 1;
    background-color: var(--siemens-petrol);
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    cursor: pointer;
    overflow: hidden;
}

.photo-area {
    position: relative;
    flex: 1 1 80%;
    display: flex;
    justify-content: center;
    align-items: center;
    border-bottom: 2px solid #3291ff;
}

.press-prompt {
    position: absolute;
    color: var(--text-yellow);
    font-weight: bold;
    z-index: 1;
}

.photo-area img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 2;
    visibility: hidden;
}

.prompt-area {
    flex: 0 0 20%;
    background-color: rgba(0,0,0,0.2);
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 5px;
}

.subject-text {
    color: var(--text-yellow);
    font-size: 0.8rem;
    margin: 0;
}

input[type="file"] { display: none; }