:root {
    --primary-color: #0077cc;
    --hover-color: #005fa3;
    --background-color: #f5f5f5;
    --text-color: #333;
    --border-color: #ddd;
    --content-bg: #fff;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    margin: 0;
    padding: 0;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    box-sizing: border-box;
    width: 100%;
}

header {
    text-align: center;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 10px;
}

h1 {
    color: var(--primary-color);
    margin-top: 0;
}

.main-content {
    display: flex;
    flex-direction: column;
}

.tabs-container {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    -ms-overflow-style: none;
    scrollbar-width: none;
    margin-bottom: 15px;
    gap: 5px;
    padding-bottom: 5px;
}

.tabs-container::-webkit-scrollbar {
    display: none;
}

.tab-button {
    background: var(--content-bg);
    border: 1px solid var(--border-color);
    padding: 8px 15px;
    cursor: pointer;
    border-radius: 4px;
    font-weight: 500;
    transition: all 0.2s ease;
    flex-shrink: 0;
    color: var(--text-color);
}

.tab-button:active {
    color: white;
}

.tab-button:hover {
    background-color: var(--hover-color);
}

.tab-button.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.content-container {
    background: var(--content-bg);
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    box-sizing: border-box;
    width: 100%;
}

/* Markdown content styling */
.content-container h1,
.content-container h2,
.content-container h3 {
    color: var(--primary-color);
    margin-top: 1.5em;
    margin-bottom: 0.5em;
}

.content-container h1:first-child,
.content-container h2:first-child,
.content-container h3:first-child {
    margin-top: 0;
}

.content-container ul,
.content-container ol {
    padding-left: 20px;
}

.content-container li {
    margin-bottom: 5px;
}

.content-container a {
    color: var(--primary-color);
    text-decoration: none;
}

.content-container a:hover {
    text-decoration: underline;
}

.content-container pre,
.content-container code {
    background-color: #f6f8fa;
    border-radius: 3px;
    padding: 2px 5px;
    font-family: 'Courier New', Courier, monospace;
}

.content-container pre {
    padding: 10px;
    overflow-x: auto;
}

.error-message {
    color: #d32f2f;
    background-color: #ffebee;
    padding: 15px;
    border-radius: 4px;
    border-left: 5px solid #d32f2f;
    margin-bottom: 20px;
}

.content-container blockquote {
    border-left: 4px solid var(--primary-color);
    margin: 1.5em 0;
    padding: 0.5em 1em;
    background-color: rgba(0, 119, 204, 0.05);
    color: #555;
}

.content-container blockquote p {
    margin: 0;
}

.content-container blockquote strong,
.content-container blockquote em {
    color: inherit;
}

.content-container strong {
    color: #2c3e50;
}

.content-container em {
    color: #34495e;
}

.content-container span[style] {
    display: inline-block;
    line-height: inherit;
}

.content-container h1,
.content-container h2,
.content-container h3,
.content-container h4,
.content-container h5,
.content-container h6 {
    margin-bottom: 0.5em;
}

.content-container a {
    color: var(--primary-color);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.content-container a:hover {
    text-decoration: none;
    border-bottom-color: var(--primary-color);
}

.invalid-link {
    color: #666;
    text-decoration: line-through;
    cursor: not-allowed;
    opacity: 0.7;
}

/* Mobile-specific styles */
@media (max-width: 768px) {
    .app-container {
        padding: 10px;
        width: 100%;
        box-sizing: border-box;
    }

    .tabs-container {
        padding: 8px 0;
        gap: 4px;
        justify-content: flex-start;
    }

    .tab-button {
        padding: 8px 16px;
        font-size: 14px;
    }

    header {
        width: 100%;
        overflow-x: hidden;
    }

    header h1 {
        font-size: 24px;
        line-height: 1.4;
        margin: 0;
        padding: 0 10px;
        word-wrap: break-word;
        white-space: normal;
    }

    .content-container {
        padding: 15px;
        width: 100%;
        box-sizing: border-box;
    }

    .content-container * {
        max-width: 100%;
        box-sizing: border-box;
        word-wrap: break-word;
    }

    .content-container pre,
    .content-container code {
        white-space: pre-wrap;
        word-wrap: break-word;
        max-width: 100%;
        box-sizing: border-box;
    }

    .content-container img {
        max-width: 100%;
        height: auto;
    }

    .content-container table {
        width: 100%;
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}

/* Desktop-specific styles */
@media (min-width: 769px) {
    .tabs-container {
        justify-content: flex-start;
    }

    header h1 {
        font-size: 32px;
        margin: 0;
    }

    header h1 .desktop-only {
        display: inline;
    }

    header h1 .mobile-br {
        display: none;
    }
}