/* 公共样式 - 轻量、清爽 */
body {
    background: #f7f8fb;
    color: #333;
}

.navbar-brand {
    font-weight: 700;
}

.hero-section {
    padding: 60px 0;
    text-align: center;
}

.hero-section h1 {
    font-size: 2.8rem;
    margin-bottom: 0.5rem;
}

.hero-section p {
    margin-bottom: 1.25rem;
    color: #555;
}

.cta-button {
    padding: 10px 22px;
    font-size: 1rem;
    border-radius: 999px;
}

.feature-card {
    text-align: center;
    padding: 20px;
    border-radius: 12px;
    border: 1px solid rgba(0,0,0,0.05);
    background: #fff;
    margin-bottom: 20px;
}

.feature-card i {
    font-size: 2.2rem;
    color: #0d6efd;
    margin-bottom: 10px;
}

.online-status {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    margin-right: 6px;
}

.online-status.online { background: #1abc9c; }
.online-status.away { background: #f1c40f; }
.online-status.offline { background: #bdc3c7; }

.chat-messages {
    max-height: 400px;
    overflow-y: auto;
    background: #f8f9fa;
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 12px;
}

.message {
    margin-bottom: 10px;
    padding: 8px;
    border-radius: 6px;
}

.message.sent {
    background: #007bff;
    color: white;
    text-align: right;
}

.message.received {
    background: #e9ecef;
}

.chat-input {
    display: flex;
    gap: 8px;
}

.chat-input input {
    flex: 1;
}

.card-header {
    font-weight: 600;
}

.footer {
    border-top: 1px solid rgba(0,0,0,0.06);
}