body {
    font-family: sans-serif;
    margin: 0;
    background-color: #f0f2f5;
}

.phone-view {
    max-width: 480px;
    margin: 0 auto;
    background-color: white;
    min-height: 100vh;
}

header {
    background-color: #f0f2f5;
    padding: 1em;
    border-bottom: 1px solid #ddd;
}

.header-main {
    text-align: center;
    margin-bottom: 1em;
}

h1 {
    margin: 0 0 0.25em 0;
    font-size: 1.5em;
    color: #1877f2;
}

.speech-bubble {
    display: inline-block;
    width: 24px;
    height: 24px;
    background-color: #1877f2;
    border-radius: 50%;
    margin-right: 0.5em;
    vertical-align: middle;
}

header p {
    margin: 0;
    color: #606770;
    font-size: 0.9em;
}

#login-btn {
    display: block;
    width: 100%;
    background-color: #1877f2;
    color: white;
    border: none;
    padding: 0.8em;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
}

#app {
    padding: 1em;
}

.topic-creation-card {
    background-color: #ffffff;
    padding: 1em;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 1.5em;
}

.card-title {
    margin: 0 0 1em 0;
    font-weight: bold;
    color: #1877f2;
}

.pin-icon {
    display: inline-block;
    width: 20px;
    height: 20px;
    background-color: #1877f2;
    border-radius: 50%;
    margin-right: 0.5em;
    vertical-align: middle;
}

#topic-input, #password-input {
    width: 100%;
    padding: 0.8em;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-bottom: 0.5em;
    box-sizing: border-box;
}

#add-topic-btn {
    width: 100%;
    background-color: #42b72a;
    color: white;
    border: none;
    padding: 0.8em;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    font-weight: bold;
}

#topics-list {
    margin-top: 1em;
}

.topic-item {
    background-color: #f0f2f5;
    padding: 1em;
    border-radius: 10px;
    margin-bottom: 0.5em;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.2s, color 0.2s;
}

.topic-name {
    font-weight: bold;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex-grow: 1;
    margin-right: 1em;
}

.delete-topic-btn {
    background: none;
    border: none;
    color: #a0a0a0;
    font-size: 1.2em;
    cursor: pointer;
    flex-shrink: 0;
}

/* Hover effect for topic items */
.topic-item:hover {
    background-color: #1877f2;
    color: white;
    cursor: pointer;
}

.topic-item:hover .topic-name {
    color: white;
}

.topic-item:hover .delete-topic-btn {
    color: white;
}