:root {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --sidebar-bg: #181818;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent: #bb86fc;
    --accent-hover: #9965d6;
    --success: #03dac6;
    --error: #cf6679;
    --border-color: #333;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    height: 100vh;
    overflow: hidden;
    /* Main scroll handled by content area */
}

.container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

header {
    padding: 1rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

h1 {
    font-size: 1.5rem;
    margin: 0;
    color: var(--text-primary);
}

.controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.main-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
    gap: 2rem;
    padding-top: 2rem;
}

.sidebar {
    width: 250px;
    flex-shrink: 0;
    overflow-y: auto;
    padding-right: 1rem;
    border-right: 1px solid var(--border-color);
}

.toc {
    font-size: 0.9rem;
}

.toc ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc li {
    margin-bottom: 0.5rem;
}

.toc a {
    color: var(--text-secondary);
    text-decoration: none;
    display: block;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    transition: all 0.2s;
}

.toc a:hover,
.toc a.active {
    background-color: rgba(187, 134, 252, 0.1);
    color: var(--accent);
}

.content-area {
    flex: 1;
    overflow-y: auto;
    padding-right: 1rem;
    padding-bottom: 2rem;
}

.markdown-body {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Markdown Content Styles */
.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
    margin-top: 1.5em;
    margin-bottom: 0.5em;
    font-weight: 600;
    color: var(--text-primary);
}

.markdown-body h1 {
    font-size: 2em;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3em;
}

.markdown-body h2 {
    font-size: 1.5em;
}

.markdown-body p {
    margin-bottom: 1em;
    color: var(--text-secondary);
}

/* Buttons & Status */
button,
.secondary-btn {
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    text-decoration: none;
    font-size: 0.9rem;
}

.primary-btn {
    background-color: var(--accent);
    color: #000;
}

.primary-btn:hover {
    background-color: var(--accent-hover);
}

.secondary-btn {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.secondary-btn:hover {
    border-color: var(--text-primary);
}

.status-msg {
    margin-left: 1rem;
    font-size: 0.9rem;
}

.success {
    color: var(--success);
}

.error {
    color: var(--error);
}

.mobile-only {
    display: none;
}


.hidden {
    display: none !important;
}

/* Scrollbars */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #444;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* Mobile Responsiveness - Increased breakpoint for better coverage */
@media (max-width: 1024px) {
    body {
        height: auto;
        overflow: auto;
        -webkit-overflow-scrolling: touch;
    }

    .container {
        padding: 0 1rem;
        height: auto;
        display: block;
    }

    header {
        flex-direction: row;
        /* Horizontal layout saves vertical space */
        flex-wrap: wrap;
        justify-content: space-between;
        gap: 0.5rem;
        text-align: left;
        position: sticky;
        top: 0;
        background-color: var(--bg-color);
        z-index: 100;
        padding: 0.5rem 0;
        /* Reduced padding */
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    }

    header h1 {
        font-size: 1.1rem;
        /* Smaller title */
        margin: 0;
    }

    .controls {
        flex-wrap: wrap;
        justify-content: flex-end;
        gap: 0.5rem;
    }

    .status-msg {
        display: none;
        /* Hide status to save space, or make it very small */
    }

    button,
    .secondary-btn {
        padding: 0.4rem 0.8rem;
        /* Smaller buttons */
        font-size: 0.8rem;
    }

    .main-layout {
        display: block;
        overflow: visible;
        padding-top: 1rem;
    }

    .sidebar {
        /* Fixed overlay behavior */
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: auto;
        max-height: 0;
        background-color: var(--bg-color);
        z-index: 90;
        /* Below header */
        overflow: hidden;
        transition: max-height 0.3s ease-out;
        border-right: none;
        border-bottom: none;
        padding: 0;
        padding-top: 0;
        display: flex;
        flex-direction: column;
    }

    .sidebar.open {
        max-height: 70vh;
        border-bottom: 2px solid var(--accent);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5);
    }

    .toc {
        padding-top: 80px;
        /* Adjusted for smaller header */
        /* Safe space for header */
        padding-bottom: 20px;
        padding-left: 20px;
        padding-right: 20px;
        overflow-y: auto;
    }

    .content-area {
        overflow: visible;
        padding-right: 0;
    }

    .mobile-only {
        display: inline-block;
        margin-bottom: 10px;
    }
}