/* RESET */
* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: 'Poppins', sans-serif;
    background: #f4f7f6;
    color: #333;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background: #fff;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

header h1 { color: #2196f3; font-size: 1.4rem; }

main {
    flex: 1;
    width: 100%;
    max-width: 800px;
    margin: 20px auto;
    padding: 0 15px;
}

.groups-container {
    background: #fff;
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 25px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.groups-container h2 {
    font-size: 1.1rem;
    color: #2196f3;
    margin-bottom: 15px;
    border-bottom: 2px solid #f0f0f0;
    padding-bottom: 8px;
}

/* Create Group Input Area */
.input-group {
    display: flex;
    gap: 10px;
}

#group-name {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-family: inherit;
}

/* Lists */
ul { list-style: none; }

li {
    background: #fafafa;
    padding: 12px 15px;
    margin-bottom: 8px;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid #eee;
}

.empty-msg { color: #888; font-style: italic; border: none; background: none; box-shadow: none; }

/* Buttons */
button {
    cursor: pointer;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    transition: opacity 0.2s;
}

button:hover { opacity: 0.8; }

#homeButton { background: #2196f3; color: #fff; padding: 8px 16px; }

#create-group-btn { background: #2196f3; color: #fff; padding: 10px 20px; }

.join-btn { background: #4caf50; color: #fff; padding: 6px 14px; }

.leave-btn { background: #f44336; color: #fff; padding: 6px 14px; }

/* Responsive */
@media (max-width: 500px) {
    .input-group { flex-direction: column; }
    #create-group-btn { width: 100%; }
}