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

body {
    font-family: 'Courier New', monospace;
    background-color: #0a0a0a;
    color: #00ff00;
    min-height: 100vh;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

h1 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: #00ff00;
    text-shadow: 0 0 10px #00ff00;
}

.subtitle {
    text-align: center;
    color: #888;
    margin-bottom: 2rem;
}

/* ─── Progress Summary ─── */
.progress-summary {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1rem;
    background: #111;
    border: 1px solid #333;
    border-radius: 8px;
}

.progress-text {
    color: #00ff00;
    font-weight: bold;
    white-space: nowrap;
}

.progress-bar {
    flex: 1;
    height: 12px;
    background: #1a1a1a;
    border: 1px solid #333;
    border-radius: 6px;
    overflow: hidden;
}

.progress-bar-large {
    height: 20px;
    margin: 1.5rem 0 2rem;
}

.progress-fill {
    height: 100%;
    background: #00ff00;
    border-radius: 6px;
    transition: width 0.5s ease;
    box-shadow: 0 0 8px #00ff0066;
}

.scoreboard-link {
    color: #888;
    text-decoration: none;
    white-space: nowrap;
    font-size: 0.85rem;
}

.scoreboard-link:hover {
    color: #00ff00;
}

/* ─── Challenge Cards ─── */
.challenges {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.card {
    background: #111;
    border: 1px solid #333;
    border-radius: 8px;
    padding: 1.5rem;
    transition: border-color 0.3s;
}

.card:hover {
    border-color: #00ff00;
}

.card-solved {
    border-color: #00ff0044;
    background: #0a1a0a;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.card h2 {
    color: #00ff00;
    font-size: 0.9rem;
}

.card h3 {
    color: #fff;
    margin-bottom: 0.5rem;
}

.card p {
    color: #aaa;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.solved-badge {
    color: #00ff00;
    font-size: 0.85rem;
    font-weight: bold;
    text-shadow: 0 0 6px #00ff0066;
}

.unsolved-badge {
    font-size: 1rem;
    opacity: 0.5;
}

.category-tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.7rem;
    background: #1a1a2a;
    color: #8888ff;
    border: 1px solid #4444aa;
    margin-left: 0.5rem;
    margin-bottom: 0.5rem;
}

.solved-time {
    color: #666;
    font-size: 0.8rem;
    margin-top: 0.5rem;
}

.hint {
    color: #666 !important;
    font-style: italic;
    font-size: 0.85rem !important;
}

.difficulty {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    margin-bottom: 0.5rem;
}

.easy {
    background: #1a3a1a;
    color: #4caf50;
    border: 1px solid #4caf50;
}

.medium {
    background: #3a3a1a;
    color: #ff9800;
    border: 1px solid #ff9800;
}

.hard {
    background: #3a1a1a;
    color: #ff4444;
    border: 1px solid #ff4444;
}

.expert {
    background: #2a1a3a;
    color: #bb66ff;
    border: 1px solid #bb66ff;
}

/* ─── Flag Submission Form ─── */
.flag-form {
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid #222;
}

.flag-input-group {
    display: flex;
    gap: 0.5rem;
}

.flag-input-group input {
    flex: 1;
    padding: 6px 10px;
    background: #0a0a0a;
    border: 1px solid #333;
    border-radius: 4px;
    color: #00ff00;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
}

.flag-input-group input:focus {
    outline: none;
    border-color: #00ff00;
}

.flag-input-group input.input-error {
    border-color: #ff4444;
}

.btn-submit {
    padding: 6px 14px;
    background: #00ff00;
    color: #000;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-family: 'Courier New', monospace;
    font-weight: bold;
    font-size: 0.85rem;
}

.btn-submit:hover {
    background: #00cc00;
}

.flag-error {
    color: #ff4444 !important;
    font-size: 0.8rem !important;
    margin-top: 0.4rem;
}

/* ─── Buttons ─── */
.btn {
    display: inline-block;
    background: #00ff00;
    color: #000;
    padding: 8px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-family: 'Courier New', monospace;
    font-weight: bold;
    font-size: 0.9rem;
    text-decoration: none;
    margin-top: 0.5rem;
}

.btn:hover {
    background: #00cc00;
}

.back {
    display: inline-block;
    color: #00ff00;
    text-decoration: none;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.back:hover {
    text-decoration: underline;
}

/* ─── Challenge Page Forms ─── */
.login-form, .ping-form, .download-form {
    background: #111;
    border: 1px solid #333;
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.3rem;
    color: #00ff00;
}

.form-group input {
    width: 100%;
    padding: 8px 12px;
    background: #0a0a0a;
    border: 1px solid #333;
    border-radius: 4px;
    color: #00ff00;
    font-family: 'Courier New', monospace;
    font-size: 1rem;
}

.form-group input:focus {
    outline: none;
    border-color: #00ff00;
}

.error {
    background: #3a1a1a;
    border: 1px solid #ff4444;
    color: #ff4444;
    padding: 8px 12px;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.flag-box {
    background: #1a3a1a;
    border: 2px solid #00ff00;
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    margin: 1.5rem 0;
}

.flag {
    font-size: 1.5rem;
    color: #00ff00;
    text-shadow: 0 0 10px #00ff00;
    margin-top: 0.5rem;
}

.output-box {
    background: #111;
    border: 1px solid #333;
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.output-box pre {
    white-space: pre-wrap;
    word-wrap: break-word;
    color: #ccc;
    font-size: 0.85rem;
    max-height: 300px;
    overflow-y: auto;
}

.info-box {
    background: #0a1a0a;
    border: 1px solid #1a3a1a;
    border-radius: 8px;
    padding: 1rem;
    margin-top: 1.5rem;
}

.info-box h3 {
    color: #00ff00;
    margin-bottom: 0.5rem;
}

.info-box p {
    color: #888;
    font-size: 0.9rem;
}

.info-box code {
    color: #00ff00;
    background: #1a1a1a;
    padding: 2px 6px;
    border-radius: 3px;
}

.file-list {
    background: #111;
    border: 1px solid #333;
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.file-list h3 {
    color: #00ff00;
    margin-bottom: 0.5rem;
}

.file-list ul {
    list-style: none;
    padding-left: 1rem;
}

.file-list li {
    margin-bottom: 0.3rem;
}

.file-list a {
    color: #4caf50;
    text-decoration: none;
}

.file-list a:hover {
    color: #00ff00;
    text-decoration: underline;
}

/* ─── Scoreboard ─── */
.scoreboard-stats {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin: 2rem 0 1rem;
}

.stat-box {
    background: #111;
    border: 1px solid #333;
    border-radius: 8px;
    padding: 1.5rem 2rem;
    text-align: center;
    min-width: 120px;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: bold;
    color: #00ff00;
    text-shadow: 0 0 8px #00ff0066;
}

.stat-label {
    display: block;
    color: #888;
    font-size: 0.8rem;
    margin-top: 0.3rem;
}

.scoreboard-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.scoreboard-table th,
.scoreboard-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid #222;
}

.scoreboard-table th {
    color: #00ff00;
    font-size: 0.85rem;
    border-bottom: 2px solid #333;
}

.scoreboard-table td {
    color: #aaa;
    font-size: 0.85rem;
}

.row-solved td {
    color: #ccc;
}

.status-solved {
    color: #00ff00;
    font-weight: bold;
}

.status-unsolved {
    color: #666;
}

/* ─── Animation ─── */
@keyframes solvedPulse {
    0% { box-shadow: 0 0 0 0 #00ff0066; }
    50% { box-shadow: 0 0 20px 4px #00ff0033; }
    100% { box-shadow: 0 0 0 0 #00ff0066; }
}

.just-solved {
    animation: solvedPulse 1s ease-in-out 2;
}

/* ─── Footer ─── */
.footer {
    text-align: center;
    color: #444;
    font-size: 0.8rem;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid #222;
}