:root {
    --bg: #0f172a;
    --panel: #111827;
    --accent: #22d3ee;
    --accent-strong: #06b6d4;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: #1f2937;
    --danger: #f87171;
    --success: #34d399;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: radial-gradient(120% 120% at 20% 20%, #111827 0%, #0b1224 40%, #070c1a 100%);
    color: var(--text);
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-strong); }

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 24px;
    background: rgba(15, 23, 42, 0.9);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(8px);
}

.brand {
    font-weight: 700;
    letter-spacing: 0.02em;
}

.nav a {
    margin-left: 16px;
    padding: 8px 12px;
    border-radius: 8px;
    transition: background 0.2s ease;
}

.nav a:hover {
    background: rgba(34, 211, 238, 0.1);
}

.container {
    max-width: 1100px;
    margin: 24px auto 60px;
    padding: 0 16px 24px;
}

.card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 16px;
    box-shadow: 0 16px 60px rgba(0, 0, 0, 0.25);
}

.card h2, .card h3 {
    margin-top: 0;
}

form {
    margin-bottom: 12px;
}

label {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 6px;
    color: var(--muted);
}

input[type="text"],
input[type="datetime-local"],
input[type="email"],
input[type="password"],
input[type="number"],
textarea,
select {
    width: 100%;
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: #0b1224;
    color: var(--text);
    margin-bottom: 12px;
}

button, .btn {
    display: inline-block;
    padding: 10px 14px;
    border: none;
    border-radius: 10px;
    background: linear-gradient(120deg, var(--accent-strong), var(--accent));
    color: #0b1224;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.1s ease, box-shadow 0.2s ease;
}

button:hover, .btn:hover { transform: translateY(-1px); }
button:active, .btn:active { transform: translateY(0); }

.btn-secondary {
    background: rgba(255,255,255,0.06);
    color: var(--text);
    border: 1px solid var(--border);
}

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

.table th, .table td {
    text-align: left;
    padding: 10px;
    border-bottom: 1px solid var(--border);
}

.status {
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 0.85rem;
    display: inline-block;
}

.status.scheduled { background: rgba(34, 211, 238, 0.16); color: var(--accent); }
.status.completed { background: rgba(52, 211, 153, 0.16); color: var(--success); }
.status.cancelled { background: rgba(248, 113, 113, 0.16); color: var(--danger); }
.status.pending { background: rgba(255, 255, 255, 0.08); color: var(--text); }
.status.sent { background: rgba(52, 211, 153, 0.16); color: var(--success); }

.flash {
    padding: 12px 14px;
    border-radius: 10px;
    margin-bottom: 12px;
}

.flash.success { background: rgba(52, 211, 153, 0.16); border: 1px solid rgba(52, 211, 153, 0.5); }
.flash.error { background: rgba(248, 113, 113, 0.16); border: 1px solid rgba(248, 113, 113, 0.5); }

.footer {
    text-align: center;
    color: var(--muted);
    padding: 20px;
    border-top: 1px solid var(--border);
    background: #0b1224;
}

.split {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 12px;
}

.empty {
    color: var(--muted);
    font-style: italic;
}

.muted { color: var(--muted); }

@media (max-width: 640px) {
    .topbar { flex-direction: column; align-items: flex-start; gap: 8px; }
    .nav a { margin-left: 0; margin-right: 12px; }
}

@media (max-width: 768px) {
    body { font-size: 15px; }
    .container { padding: 0 12px 20px; }
    .card { padding: 14px; }
    .table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        white-space: nowrap;
    }
    .table th, .table td { padding: 8px 10px; }
    button, .btn { width: 100%; margin-bottom: 8px; }
    form { margin-bottom: 16px; }
}