:root {
    --bg: #f4f6f8;
    --card: #ffffff;
    --text: #1f2933;
    --muted: #6b7280;
    --primary: #0f766e;
    --primary-dark: #115e59;
    --danger: #b91c1c;
    --warning: #b45309;
    --success: #166534;
    --border: #d1d5db;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, sans-serif;
    background: linear-gradient(180deg, #eef2f7 0%, #f8fafc 100%);
    color: var(--text);
}

a {
    color: var(--primary);
    text-decoration: none;
}

.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 24px;
    background: #0b1320;
    color: #fff;
}

.top-nav .brand a {
    color: #fff;
    font-size: 1.2rem;
    font-weight: 700;
}

.top-nav nav a {
    color: #dbeafe;
    margin-left: 16px;
}

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

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 18px;
    margin-bottom: 16px;
    box-shadow: 0 4px 14px rgba(15, 23, 42, 0.05);
}

.auth-card {
    max-width: 520px;
    margin: 32px auto;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.input {
    width: 100%;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid var(--border);
    margin-bottom: 10px;
    font-size: 0.95rem;
    background: #fff;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
}

.btn {
    display: inline-block;
    padding: 10px 14px;
    border: none;
    border-radius: 8px;
    background: var(--primary);
    color: #fff;
    cursor: pointer;
    font-weight: 600;
}

.btn:hover {
    background: var(--primary-dark);
}

.btn-small {
    padding: 8px 10px;
    font-size: 0.85rem;
}

.btn-danger {
    background: var(--danger);
}

.btn-warning {
    background: var(--warning);
}

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

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

th, td {
    border-bottom: 1px solid #e5e7eb;
    text-align: left;
    padding: 10px;
}

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

.error {
    display: block;
    color: var(--danger);
    margin-top: -6px;
    margin-bottom: 8px;
}

.flash-wrap {
    margin-bottom: 14px;
}

.flash {
    padding: 10px;
    border-radius: 8px;
    margin-bottom: 8px;
}

.flash-success {
    background: #dcfce7;
    color: var(--success);
}

.flash-danger {
    background: #fee2e2;
    color: var(--danger);
}

.flash-warning {
    background: #fef3c7;
    color: #92400e;
}

.flash-info {
    background: #dbeafe;
    color: #1d4ed8;
}

.simple-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.simple-list li {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    border-bottom: 1px solid #e5e7eb;
    padding: 8px 0;
}

.messages-box {
    border: 1px solid var(--border);
    border-radius: 10px;
    min-height: 280px;
    max-height: 360px;
    overflow-y: auto;
    padding: 10px;
    background: #fbfdff;
}

.message-item {
    border-bottom: 1px solid #edf2f7;
    padding: 8px 0;
}

.message-item p {
    margin: 5px 0 0;
}

.time {
    font-size: 0.8rem;
    color: var(--muted);
    margin-left: 6px;
}

.chat-form {
    display: flex;
    gap: 8px;
    margin-top: 10px;
}

.inline-actions {
    display: flex;
    gap: 10px;
}

.check-label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
}

.avatar {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid #d1d5db;
}

.avatar-fallback {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #c7d2fe;
    color: #1e1b4b;
    font-size: 2.5rem;
    font-weight: 700;
}

@media (max-width: 900px) {
    .grid-2 {
        grid-template-columns: 1fr;
    }

    .chat-form {
        flex-direction: column;
    }
}