:root {
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f4f7f9;
    --color-text-primary: #1f2937;
    --color-text-secondary: #6b7280;
    --color-link: #4b4b4b;       /* monochrome link color */
    --color-link-hover: #2a2a2a; /* darker monochrome on hover */
    --color-border: black;
    --color-code-bg: #f3f4f6;
    --font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.dark-mode {
    --color-bg-primary: #1f2937;
    --color-bg-secondary: #374151;
    --color-text-primary: #f9fafb;
    --color-text-secondary: #d1d5db;
    --color-link: #b0b0b0;       /* lighter monochrome for dark mode */
    --color-link-hover: #e0e0e0; /* lighter hover */
    --color-border: #4b5563;
    --color-code-bg: #4b5563;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

#app-container {
display: flex;
flex-direction: column;
min-height: 100vh;
}

#main-header {
display: flex;
justify-content: space-between;
align-items: center;
padding: 1rem 1.5rem;
border-bottom: 2px solid var(--color-text-primary);
background-color: var(--color-bg-primary);
position: sticky;
top: 0;
z-index: 10;
}

.logo-title {
    font-size: 70%;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
}

.cloud-icon {
    font-size: 1.2em;
    margin-right: 0.25rem;
    white-space: nowrap;
    vertical-align: middle;
    filter: grayscale(100%) !important; /* Always monochrome */
}

.header-controls {
    display: flex;
    gap: 0.5rem;
}

main {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

#sidebar {
width: 280px;
padding: 1.5rem;
background-color: #000000;
color: white !important;
flex-shrink: 0;
font-size: 80%;
position: fixed;
top: 60px;
left: 0;
height: calc(100% - 60px);
z-index: 20;
transform: translateX(-100%);
transition: transform 0.3s ease-out;
box-shadow: 2px 0 5px rgba(0, 0, 0, 0.2);
border-right: 1px solid var(--color-border);
}

#sidebar a {
color: white !important;
}

#sidebar.hidden {
transform: translateX(-100%);
}

#sidebar:not(.hidden) {
transform: translateX(0);
}

#content {
flex-grow: 1;
overflow-x: auto;
padding-left: 20%;
padding-right: 20%;
padding-top: 2rem;
padding-bottom: 2rem;
}

a {
    color: var(--color-link);
    text-decoration: underline;
    transition: color 0.2s;
}

a:hover {
    color: var(--color-link-hover);
}

.file-list {
    list-style: none;
    padding: 0;
    margin-top: 1rem;
}

.file-list li {
    margin-bottom: 0.4rem;
}

.file-list a {
    display: block;
    padding: 0.3rem 0;
    color: var(--color-text-primary);
}

footer {
    font-size: 50%;
    padding: 10px;
    background-color: black;
    color: white;
    position: fixed;
    text-align: center;
    left: 0;
    bottom: 0;
    width: 100%;
}

.file-icon {
    margin-right: 0.5rem;
    color: var(--color-text-secondary);
    filter: grayscale(100%) !important; /* Always monochrome */
}

#theme-toggle,
.menu-toggle,
#size-down,
#size-up {
background: none;
border: 1px solid var(--color-border);
color: var(--color-text-primary);
cursor: pointer;
padding: 0.5rem 0.75rem;
font-size: 1.2rem;
line-height: 1;
border-radius: 4px;
transition: background-color 0.2s;
}

#theme-icon {
filter: grayscale(100%);
/* optionally adjust brightness or contrast if needed */
transition: filter 0.3s ease;
color: inherit; /* so it uses current text color */
}


#theme-toggle:hover,
.menu-toggle:hover,
#size-down:hover,
#size-up:hover {
background-color: var(--color-bg-secondary);
}

#content h1,
#content h2,
#content h3,
#content h4 {
margin-top: 2rem;
margin-bottom: 1rem;
font-weight: 500;
color: var(--color-text-primary);
border-bottom: 0.5px dashed var(--color-border);
padding-bottom: 20px;
text-align: center;
}

#content h1 { font-size: 2.2rem; }
#content h2 { font-size: 1.8rem; }

#content p {
margin-bottom: 1rem;
text-align: justify;
}

#content ul,
#content ol {
margin-left: 2rem;
margin-bottom: 1rem;
}

#content pre {
background-color: var(--color-code-bg);
padding: 1rem;
border-radius: 4px;
overflow-x: auto;
margin-bottom: 1rem;
font-family: var(--font-family);
font-size: 0.9rem;
}

#content code {
background-color: var(--color-code-bg);
padding: 0.2rem 0.4rem;
border-radius: 3px;
font-family: var(--font-family);
}

#content img {display: block;height: auto;/* width: 100%; */max-width: 500px;margin: 20px auto;border: 2px solid var(--color-border);border-radius: 4px;filter: grayscale(100%);transition: filter 0.3s ease;}

/* On hover capable devices: images become color on hover */
@media (hover: hover) and (pointer: fine) {
    #content img:hover {
    filter: none;
    }
}

/* On touch devices: images remain monochrome */
@media (hover: none) and (pointer: coarse) {
    #content img {
    filter: grayscale(100%);
    }
}

.initial-load,
.error-prompt {
    color: var(--color-text-secondary);
    font-style: italic;
    margin-top: 1rem;
}

@media (max-width: 768px) {
    #sidebar {
    width: 80%;
    }

    .menu-toggle {
        display: block;
    }

    #content {
    padding-left: 20px;
    padding-right: 20px;
    padding-top: 10px;
    padding-bottom: 10px;
    }

    #content img {
    max-width: 100%;
    }
}

@media (min-width: 769px) {
    body {
        font-size: 150%;
    }

    .menu-toggle {
        display: block;
    }

    #sidebar {
    width: 280px;
    }
}