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

body {
    font-family: 'Roboto', sans-serif;
    background-color: #f5f5f5;
    color: #333;
}

.app-header {
    background: linear-gradient(135deg, #1976d2 0%, #1565c0 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-left {
    flex: 1;
}

.platform-title {
    font-size: 1.5rem;
    font-weight: 400;
    letter-spacing: 0.5px;
}

.header-right {
    flex: 1;
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.company-selector-wrapper {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background-color: rgba(255, 255, 255, 0.1);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    min-width: 250px;
}

.company-select-label {
    font-size: 0.875rem;
    color: white;
    opacity: 0.9;
    white-space: nowrap;
}

.company-select-header {
    background-color: white;
    border: none;
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    font-size: 0.875rem;
    cursor: pointer;
    flex: 1;
    min-width: 150px;
}

.company-select-header:focus {
    outline: none;
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.3);
}

.main-content {
    padding: 2rem 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.welcome-message {
    text-align: center;
    background: white;
    border-radius: 8px;
    padding: 3rem 2rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
}

.welcome-message h2 {
    color: #1976d2;
    margin-bottom: 1rem;
    font-weight: 400;
    font-size: 1.75rem;
}

.welcome-message p {
    color: #666;
    font-size: 1.125rem;
    line-height: 1.5;
}

.company-details-main {
    background: white;
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
}

.selected-company-display {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid #e0e0e0;
}

.selected-company-name {
    color: #1976d2;
    font-size: 2.5rem;
    font-weight: 300;
    margin: 0;
    letter-spacing: 0.5px;
}

.topics-section h2 {
    color: #333;
    margin-bottom: 1.5rem;
    font-weight: 400;
    font-size: 1.5rem;
}

.topics-list-main {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.topic-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
    background-color: #e3f2fd;
    color: #1976d2;
    border-radius: 24px;
    font-size: 1.125rem;
    font-weight: 500;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}

.topic-chip:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.topic-chip .material-icons {
    font-size: 20px;
}

.no-topics {
    color: #999;
    font-style: italic;
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .header-right {
        justify-content: flex-start;
        width: 100%;
    }

    .company-selector-wrapper {
        min-width: auto;
        width: 100%;
        max-width: 300px;
    }

    .platform-title {
        font-size: 1.25rem;
    }

    .container {
        padding: 0 1rem;
    }

    .selected-company-name {
        font-size: 2rem;
    }

    .welcome-message {
        padding: 2rem 1.5rem;
    }

    .company-details-main {
        padding: 1.5rem;
    }

    .topics-list-main {
        gap: 0.75rem;
    }

    .topic-chip {
        padding: 0.75rem 1.25rem;
        font-size: 1rem;
    }
}