:root {
    --primary-color: #2563eb;
    --text-color: #1f2937;
    --background-color: #f3f4f6;
}

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

body {
    font-family: system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    direction: rtl;
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--primary-color);
}

h2 {
    font-size: 1.8rem;
    margin: 2rem 0 1rem;
}

.calculator {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

.calculator-form {
    display: grid;
    gap: 1rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

input {
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

button {
    background-color: var(--primary-color);
    color: white;
    padding: 0.75rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    margin-top: 1rem;
}

button:hover {
    opacity: 0.9;
}

.result {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 4px;
    background-color: #f8fafc;
    text-align: center;
    font-size: 1.2rem;
}

.how-to ol {
    margin: 1rem 2rem;
}

.faq details {
    margin-bottom: 1rem;
    padding: 1rem;
    background: white;
    border-radius: 4px;
}

.faq summary {
    cursor: pointer;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.faq p {
    padding: 1rem;
    background: #f8fafc;
    border-radius: 4px;
}