:root {
    --bg-color: #0d1117;
    --box-bg: rgba(22, 27, 34, 0.85);
    --text-main: #c9d1d9;
    --text-muted: #8b949e;
    --accent-neon: #39ff14; /* Neon Green */
    --accent-hover: #32e212;
    --error-color: #ff3333;
    --border-color: #30363d;
    --input-bg: #0d1117;
    --glass-border: rgba(57, 255, 20, 0.3);
    
    --flag-bg: rgba(255, 215, 0, 0.1);
    --flag-border: #ffd700;
    --flag-text: #ffd700;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Courier New', Courier, monospace; /* Hacker aesthetic */
    background-color: var(--bg-color);
    color: var(--text-main);
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(57, 255, 20, 0.05), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(0, 255, 255, 0.05), transparent 25%);
    background-size: cover;
    background-attachment: fixed;
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--accent-neon);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 15px;
    text-shadow: 0 0 5px rgba(57, 255, 20, 0.3);
}

h1 {
    font-size: 2.2em;
    text-align: center;
    margin-top: 20px;
    margin-bottom: 30px;
}

/* Glassmorphism Container */
.challenge, .login-container, .admin-container, .container {
    background-color: var(--box-bg);
    padding: 30px;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5), inset 0 0 10px rgba(57, 255, 20, 0.05);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    margin-top: 15px;
    margin-bottom: 15px;
    width: 100%;
    max-width: 800px;
}

.login-container, .admin-container {
    max-width: 500px;
    margin-top: 50px;
} /* Center small forms */

p {
    line-height: 1.6;
    margin-bottom: 15px;
}

strong {
    color: #fff;
}

a {
    color: var(--accent-neon);
    text-decoration: none;
    transition: all 0.3s ease;
}

a:hover {
    color: #fff;
    text-shadow: 0 0 8px var(--accent-neon);
}

/* Form Elements */
form {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 20px;
}

input[type=text], input[type=email], input[type=password] {
    padding: 12px 15px;
    width: 100%;
    background-color: var(--input-bg);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 16px;
    transition: all 0.3s ease;
}

input[type=text]:focus, input[type=email]:focus, input[type=password]:focus {
    outline: none;
    border-color: var(--accent-neon);
    box-shadow: 0 0 8px rgba(57, 255, 20, 0.2);
}

button {
    background-color: transparent;
    color: var(--accent-neon);
    padding: 12px 20px;
    border: 1px solid var(--accent-neon);
    cursor: pointer;
    border-radius: 4px;
    font-family: inherit;
    font-size: 16px;
    text-transform: uppercase;
    font-weight: bold;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}

button:hover {
    background-color: var(--accent-neon);
    color: #000;
    box-shadow: 0 0 15px rgba(57, 255, 20, 0.5);
}

/* Specific UI Elements */
.error {
    color: var(--error-color);
    font-weight: bold;
    margin-top: 10px;
    text-shadow: 0 0 5px rgba(255, 51, 51, 0.4);
    background: rgba(255, 51, 51, 0.1);
    padding: 10px;
    border-left: 3px solid var(--error-color);
    border-radius: 0 4px 4px 0;
}

.hint {
    color: var(--text-muted);
    font-style: italic;
    font-size: 0.9em;
}

.alumno-info {
    background: rgba(57, 255, 20, 0.05);
    border-left: 3px solid var(--accent-neon);
    padding: 12px 20px;
    border-radius: 0 4px 4px 0;
    margin-bottom: 20px;
    font-size: 0.95em;
    width: 100%;
    max-width: 800px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.flag-box {
    background: var(--flag-bg);
    border: 1px solid var(--flag-border);
    color: var(--flag-text);
    padding: 15px 20px;
    border-radius: 4px;
    margin: 20px 0;
    font-family: 'Courier New', Courier, monospace;
    font-size: 1.1em;
    text-shadow: 0 0 5px rgba(255, 215, 0, 0.3);
    word-break: break-all;
}

/* Status Indicator */
.status-led {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--accent-neon);
    box-shadow: 0 0 8px var(--accent-neon);
    margin-right: 10px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { opacity: 0.6; box-shadow: 0 0 5px var(--accent-neon); }
    50% { opacity: 1; box-shadow: 0 0 15px var(--accent-neon); }
    100% { opacity: 0.6; box-shadow: 0 0 5px var(--accent-neon); }
}

/* Tables (Admin panel) */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    background-color: rgba(22, 27, 34, 0.5);
}

th, td {
    border: 1px solid var(--border-color);
    padding: 12px;
    text-align: left;
}

th {
    background-color: rgba(57, 255, 20, 0.1);
    color: var(--accent-neon);
    font-weight: bold;
}

tr:nth-child(even) {
    background-color: rgba(255, 255, 255, 0.02);
}

tr:hover {
    background-color: rgba(57, 255, 20, 0.05);
}

/* Responsive */
@media (max-width: 600px) {
    .alumno-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    h1 {
        font-size: 1.8em;
    }
}

.cipher {
    font-family: 'Courier New', Courier, monospace;
    background-color: rgba(22, 27, 34, 0.8);
    color: var(--accent-neon);
    padding: 8px 12px;
    border-radius: 4px;
    border: 1px dashed var(--accent-neon);
    display: inline-block;
}

/* Checkbox Groups */
.checkbox-group {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

@media (min-width: 600px) {
    .checkbox-group {
        grid-template-columns: 1fr 1fr;
    }
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(22, 27, 34, 0.5);
    padding: 10px 15px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.9em;
}

.checkbox-label:hover {
    background: rgba(57, 255, 20, 0.05);
    border-color: var(--accent-neon);
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent-neon);
    cursor: pointer;
    margin: 0;
}