:root {
    color-scheme: light dark;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #0f172a;
    color: #e2e8f0;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: radial-gradient(circle at top, rgba(94, 234, 212, 0.15), rgba(15, 23, 42, 0.95));
}

.container {
    width: min(720px, 90vw);
    margin: 0 auto;
    padding: 1.5rem;
}

.site-header,
.site-footer {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(148, 163, 184, 0.2);
}

.site-footer {
    border-top: 1px solid rgba(148, 163, 184, 0.2);
    margin-top: auto;
    border-bottom: none;
}

.site-header h1 {
    margin: 0;
    font-size: 2.4rem;
    color: #38bdf8;
}

.tagline {
    margin: 0.25rem 0 0;
    color: rgba(226, 232, 240, 0.7);
}

main {
    flex: 1;
    display: grid;
    gap: 1.5rem;
    padding: 2rem 0 3rem;
}

.card {
    background: rgba(15, 23, 42, 0.85);
    border: 1px solid rgba(148, 163, 184, 0.25);
    border-radius: 16px;
    padding: 1.75rem;
    box-shadow: 0 20px 40px -20px rgba(15, 23, 42, 0.8);
}

.card h2 {
    margin-top: 0;
    font-size: 1.5rem;
    color: #e0f2fe;
}

.card.success {
    border-color: rgba(74, 222, 128, 0.6);
}

.card.info {
    border-color: rgba(56, 189, 248, 0.6);
}

.card.warning {
    border-color: rgba(251, 191, 36, 0.6);
}

.card.stats {
    border-color: rgba(59, 130, 246, 0.55);
}

.card p,
.card li {
    line-height: 1.6;
}

ul {
    padding-left: 1.5rem;
}

.form-stack {
    display: grid;
    gap: 0.75rem;
    margin-top: 1rem;
}

label {
    font-weight: 600;
    color: rgba(224, 242, 254, 0.9);
}

input[type="email"],
input[type="text"],
input[type="number"] {
    padding: 0.75rem 1rem;
    border-radius: 12px;
    border: 1px solid rgba(148, 163, 184, 0.35);
    background: rgba(15, 23, 42, 0.6);
    color: #e2e8f0;
}

input[type="email"]:focus,
input[type="text"]:focus,
input[type="number"]:focus {
    outline: none;
    border-color: #38bdf8;
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.25);
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 999px;
    border: none;
    cursor: pointer;
    font-weight: 600;
    letter-spacing: 0.02em;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    background: rgba(148, 163, 184, 0.2);
    color: #e2e8f0;
}

.btn.primary {
    background: linear-gradient(120deg, #22d3ee, #3b82f6);
    color: #0f172a;
    box-shadow: 0 12px 24px -12px rgba(59, 130, 246, 0.8);
}

.btn.danger {
    background: linear-gradient(120deg, #f87171, #ef4444);
    color: #0f172a;
    box-shadow: 0 12px 24px -12px rgba(248, 113, 113, 0.8);
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 16px 30px -18px rgba(148, 163, 184, 0.6);
}

.alert {
    border-radius: 12px;
    padding: 1rem 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.alert.success {
    background: rgba(74, 222, 128, 0.15);
    border: 1px solid rgba(74, 222, 128, 0.4);
    color: #bbf7d0;
}

.alert.error {
    background: rgba(248, 113, 113, 0.15);
    border: 1px solid rgba(248, 113, 113, 0.4);
    color: #fecaca;
}

.alert.warning {
    background: rgba(251, 191, 36, 0.15);
    border: 1px solid rgba(251, 191, 36, 0.4);
    color: #fde68a;
}

.muted {
    color: rgba(226, 232, 240, 0.6);
    font-size: 0.9rem;
}

.actions {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.actions .btn,
.actions form {
    margin: 0;
}

.table-responsive {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
    min-width: 100%;
    color: inherit;
}

.table th,
.table td {
    text-align: left;
    padding: 0.75rem;
    border-bottom: 1px solid rgba(148, 163, 184, 0.2);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

.table tbody tr.current-session {
    background: rgba(59, 130, 246, 0.08);
}

.table td.actions,
.table th.actions {
    text-align: right;
    white-space: nowrap;
}

.inline-form {
    display: inline-flex;
    align-items: center;
}

.inline-form .btn {
    margin: 0;
}

.header-flex {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

.header-nav {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    align-items: center;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
}

.stat {
    background: rgba(15, 23, 42, 0.6);
    border-radius: 12px;
    padding: 1rem;
    border: 1px solid rgba(148, 163, 184, 0.2);
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: #f8fafc;
}

.stat-label {
    font-size: 0.85rem;
    color: rgba(226, 232, 240, 0.7);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.timeline {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 1rem;
}

.timeline li {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 1rem;
    align-items: start;
}

.timeline-time {
    font-weight: 600;
    color: rgba(226, 232, 240, 0.7);
}

.timeline-body {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: 12px;
    padding: 0.75rem 1rem;
}

.mini-json {
    margin: 0.5rem 0 0;
    font-size: 0.8rem;
    line-height: 1.4;
    background: rgba(15, 23, 42, 0.5);
    border-radius: 8px;
    padding: 0.5rem 0.75rem;
    overflow-x: auto;
}

.resend-hint {
    display: inline-block;
    margin-top: 0.75rem;
    font-size: 0.85rem;
    color: rgba(226, 232, 240, 0.7);
}

@media (max-width: 600px) {
    .card {
        padding: 1.25rem;
    }

    .site-header h1 {
        font-size: 1.8rem;
    }

    .header-flex {
        flex-direction: column;
        align-items: flex-start;
    }

    .timeline li {
        grid-template-columns: 1fr;
    }

    .timeline-time {
        font-size: 0.85rem;
    }

    .table thead {
        display: none;
    }

    .table tr {
        display: block;
        margin-bottom: 1rem;
        border: 1px solid rgba(148, 163, 184, 0.2);
        border-radius: 12px;
        padding: 0.5rem 0.75rem;
    }

    .table td {
        display: flex;
        justify-content: space-between;
        border-bottom: none;
        padding: 0.5rem 0;
    }

    .table td::before {
        content: attr(data-label);
        font-weight: 600;
        margin-right: 0.5rem;
        color: rgba(226, 232, 240, 0.7);
    }
}