/* Clean White background, very subtle off-white for elements, professional dark gray text. */
:root {
    --bg-color: #FFFFFF;
    --text-color: #333333;
    --primary-btn: #007BFF;
    --primary-btn-hover: #0056b3;
    --error-color: #D32F2F;
    --modal-bg: #FFFFFF;
    --input-border: #DDDDDD;
    --subtle-bg: #FAFAFA;
}

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--subtle-bg);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

main {
    background-color: var(--bg-color);
    padding: 32px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    text-align: center;
    width: 90%;
    max-width: 500px;
    box-sizing: border-box;
}

h1, h2 {
    margin-top: 0;
    margin-bottom: 20px;
    font-weight: 600;
}

.hidden {
    display: none !important;
}

/* Full-screen Modal Overlay */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--subtle-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.modal-content {
    background: var(--modal-bg);
    padding: 32px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    text-align: center;
    width: 90%;
    max-width: 320px;
}

input[type="password"], input[type="file"], input[type="text"] {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid var(--input-border);
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 16px;
    text-align: center;
    background-color: var(--bg-color);
}

input[type="password"] {
    letter-spacing: 4px;
}

input[type="file"] {
    text-align: left;
}

button {
    background-color: var(--primary-btn);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    width: 100%;
    margin-top: 10px;
    transition: background-color 0.2s ease;
}

button:hover {
    background-color: var(--primary-btn-hover);
}

.error-text {
    color: var(--error-color);
    margin-top: 15px;
    font-weight: 500;
    font-size: 14px;
}

.nav-link {
    display: inline-block;
    margin-top: 20px;
    color: var(--primary-btn);
    text-decoration: none;
    font-weight: 500;
}

.nav-link:hover {
    text-decoration: underline;
}

/* Uploader specific */
#progress-text {
    margin-top: 15px;
    font-weight: 500;
    color: var(--primary-btn);
}
#upload-success {
    color: #28a745;
    margin-top: 15px;
    font-weight: 500;
    font-size: 16px;
}

/* WebRTC specific */
#video-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 20px;
}
video {
    width: 100%;
    border-radius: 8px;
    background: #000;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
#camera-blocked {
    font-size: 20px;
    color: var(--error-color);
    font-weight: bold;
    padding: 20px;
    border: 2px solid var(--error-color);
    border-radius: 8px;
}