:root {
    --bg: #081120;
    --bg-2: #020817;
    --card: #1e2b43;
    --card-2: #16233a;
    --text: #f8fafc;
    --muted: #b8c4d9;
    --border: rgba(255, 255, 255, 0.08);
    --accent: #d08cff;
    --accent-2: #82d8ff;
    --input-bg: #020b1f;
    --shadow: 0 12px 30px rgba(0, 0, 0, 0.28);
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
    background:
        radial-gradient(circle at top left, rgba(53, 98, 255, 0.18), transparent 30%),
        radial-gradient(circle at top right, rgba(164, 88, 255, 0.12), transparent 25%),
        linear-gradient(180deg, var(--bg), var(--bg-2));
    color: var(--text);
    min-height: 100vh;
    padding: 16px;
}

.container {
    max-width: 980px;
    margin: 0 auto;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 18px;
}

.brand {
    font-size: 1.05rem;
    font-weight: 700;
    color: #ffffff;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.nav-links a {
    color: #f0abfc;
    text-decoration: none;
    font-size: 0.95rem;
}

.nav-links a:hover {
    text-decoration: underline;
}

.nav-links span {
    color: #d8b4fe;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
    margin-bottom: 18px;
}

.stat {
    background: linear-gradient(180deg, rgba(30, 43, 67, 0.95), rgba(9, 18, 38, 0.95));
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 12px 16px;
    box-shadow: var(--shadow);
    text-align: center;
}

.stat h3 {
    margin: 0 0 4px 0;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--muted);
}

.stat p {
    margin: 0;
    font-size: 1.9rem;
    font-weight: 700;
    color: #ffffff;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 18px 16px;
    margin-bottom: 18px;
    box-shadow: var(--shadow);
}

.card h2 {
    margin-top: 0;
    margin-bottom: 18px;
    font-size: 1.1rem;
    color: #ffffff;
}

.session-form {
    display: grid;
    gap: 10px;
}

.session-form input {
    width: 100%;
    border: 1px solid rgba(255,255,255,0.05);
    background: var(--input-bg);
    color: var(--text);
    border-radius: 12px;
    padding: 14px 14px;
    font-size: 0.95rem;
}

.session-form input::placeholder {
    color: #97a4be;
}

.session-form input:focus {
    outline: none;
    border-color: rgba(208, 140, 255, 0.55);
    box-shadow: 0 0 0 3px rgba(208, 140, 255, 0.12);
}

.session-form button {
    margin-top: 2px;
    border: none;
    border-radius: 12px;
    padding: 14px 16px;
    font-size: 0.98rem;
    font-weight: 700;
    color: #081120;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    cursor: pointer;
    transition: transform 0.15s ease, opacity 0.15s ease;
}

.session-form button:hover {
    transform: translateY(-1px);
    opacity: 0.96;
}

.table-wrap {
    width: 100%;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

thead th {
    font-weight: 700;
    color: #ffffff;
    padding: 12px 10px;
    border-bottom: 1px solid var(--border);
    text-align: center;
}

tbody td {
    padding: 12px 10px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    text-align: center;
    color: #e7edf8;
}

tbody tr:hover {
    background: rgba(255,255,255,0.025);
}

.mobile-list {
    display: none;
}

.mobile-item {
    background: rgba(2, 11, 31, 0.92);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 14px;
    padding: 12px;
}

.mobile-item strong {
    display: block;
    margin-bottom: 10px;
    color: #f0abfc;
    font-size: 0.98rem;
}

.mobile-row {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    padding: 4px 0;
    font-size: 0.92rem;
}

.mobile-row span:first-child {
    color: var(--muted);
}

.mobile-row span:last-child {
    color: #ffffff;
    text-align: right;
}

.empty-state {
    margin: 0;
    color: var(--muted);
}

@media (max-width: 768px) {
    body {
        padding: 12px;
    }

    .nav {
        flex-direction: column;
        align-items: flex-start;
        margin-bottom: 14px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .stat p {
        font-size: 1.35rem;
    }

    .card {
        padding: 16px 14px;
        border-radius: 16px;
    }

    .table-wrap {
        display: none;
    }

    .mobile-list {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }
}