:root {
    --derma-blue: #5BA2E0;
    --derma-dark: #131313;
    --derma-grey: #202020;
    --derma-light: #D4D4D4;
    --derma-border: #383838;
}

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

body {
    font-family: Verdana, Tahoma, Arial, sans-serif;
    font-size: 13px;
    color: var(--derma-light);
    min-height: 100vh;
    line-height: 1.4;
    background: var(--derma-dark);
    padding: 20px;
}

.rules-container {
    max-width: 1200px;
    margin: 0 auto;
    background: linear-gradient(180deg, var(--derma-grey) 0%, var(--derma-dark) 100%);
    border: 1px solid var(--derma-border);
    border-radius: 3px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    height: 90vh;
}

.rules-header {
    padding: 15px 20px;
    border-bottom: 1px solid var(--derma-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

h1 {
    font-size: 24px;
    font-weight: normal;
    color: var(--derma-blue);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.docs-container {
    flex-grow: 1;
    position: relative;
    background: #fff;
    margin: 1px;
}

iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.back-btn {
    background: linear-gradient(180deg, #2A2A2A 0%, #232323 100%);
    color: var(--derma-light);
    border: 1px solid var(--derma-border);
    border-radius: 2px;
    padding: 8px 12px;
    text-decoration: none;
    transition: all 0.1s ease;
    display: inline-flex;
    align-items: center;
}

.back-btn:hover {
    border-color: var(--derma-blue);
    color: var(--derma-blue);
}

.back-btn span {
    margin-right: 5px;
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    
    h1 {
        font-size: 20px;
    }
}