:root {
    --color-bg: #ffffff;
    --color-text: #222;
    --color-heading: #004080;
    --color-link: #0066cc;
    --color-border: #e0e0e0;
    --color-code-bg: #f1f1f1; /* Kept the slightly darker background */
    --color-code-text: #333;
    --color-nav-bg: #f8f8f8;
    --color-nav-text: #333;
    --color-nav-active: #004080;
    --color-nav-active-text: #ffffff;
    --shadow: 0 2px 5px rgba(0,0,0,0.05);
}


html[data-theme='dark'] {
    --color-bg: #1e1e1e;
    --color-text: #e0e0e0;
    --color-heading: #80c0ff;
    --color-link: #58a6ff;
    --color-border: #333;
    --color-code-bg: #2a2a2a;
    --color-code-text: #e0e0e0;
    --color-nav-bg: #222;
    --color-nav-text: #e0e0e0;
    --color-nav-active: #80c0ff;
    --color-nav-active-text: #1a1a1a;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.7;
    background-color: var(--color-bg);
    color: var(--color-text);
    display: flex;
}

/* Default RTL Styles */
#sidebar {
    width: 280px;
    height: 100vh;
    position: fixed;
    top: 0;
    right: 0; /* RTL default */
    background-color: var(--color-nav-bg);
    border-left: 1px solid var(--color-border); /* RTL default */
    border-right: none;
    padding: 20px;
    overflow-y: auto;
    box-shadow: var(--shadow);
    z-index: 10;
}

#sidebar ul ul {
    padding-right: 20px; /* RTL default */
    padding-left: 0;
}

main {
    margin-right: 320px; /* RTL default: sidebar width + padding */
    margin-left: auto;
    padding: 40px;
    max-width: 900px;
    width: 100%;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    left: 20px; /* RTL default */
    right: auto;
    padding: 8px 12px;
    background-color: var(--color-code-bg);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: 5px;
    cursor: pointer;
    z-index: 100;
}

/* LTR Overrides for English pages */
html[lang="en"] body {
    direction: ltr; /* Apply LTR direction */
}

html[lang="en"] #sidebar {
    left: 0; /* LTR position */
    right: auto;
    border-right: 1px solid var(--color-border); /* LTR border */
    border-left: none;
}

html[lang="en"] #sidebar ul ul {
    padding-left: 20px; /* LTR padding */
    padding-right: 0;
}

html[lang="en"] main {
    margin-left: 320px; /* LTR margin */
    margin-right: auto;
}

html[lang="en"] .theme-toggle {
    right: 20px; /* LTR position */
    left: auto;
}


/* --- Common Styles (unchanged) --- */

#sidebar h2 {
    font-size: 1.5rem;
    color: var(--color-heading);
    border-bottom: 2px solid var(--color-border);
    padding-bottom: 10px;
}

#sidebar ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

#sidebar li a {
    display: block;
    padding: 10px 15px;
    text-decoration: none;
    color: var(--color-nav-text);
    border-radius: 5px;
    transition: all 0.2s ease;
}

#sidebar li a:hover {
    background-color: var(--color-border);
}

#sidebar li a.active {
    background-color: var(--color-nav-active);
    color: var(--color-nav-active-text);
    font-weight: bold;
}

section {
    margin-bottom: 60px;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 30px;
}

h1, h2, h3 {
    color: var(--color-heading);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 10px;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; border-bottom: none; }

pre {
    background-color: var(--color-code-bg);
    color: var(--color-code-text);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    overflow-x: auto;
    font-family: "Courier New", Courier, monospace;
    font-size: 0.95rem;
    text-align: left; /* Always LTR for code */
    direction: ltr;   /* Always LTR for code */
}

code {
    background-color: var(--color-code-bg);
    padding: 3px 6px;
    border-radius: 5px;
    border: 1px solid var(--color-border);
    font-family: "Courier New", Courier, monospace;
}

a {
    color: var(--color-link);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.button-link {
    display: inline-block;
    padding: 10px 20px;
    background-color: var(--color-heading);
    color: var(--color-bg);
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.2s ease;
}
.button-link:hover {
    opacity: 0.85;
    text-decoration: none;
}

.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin: 20px 0;
    font-size: 0.9rem;
}
.alert-warning {
    background-color: #fffaf0;
    border: 1px solid #ffde7a;
    color: #7a5c00;
}
html[data-theme='dark'] .alert-warning {
    background-color: #3d2f00;
    border-color: #a8934f;
    color: #fff5cc;
}

/* --- Syntax Highlighting --- */
pre code .php-comment,
pre code .html-comment {
    color: #6a9955; /* Green */
}
pre code .php-keyword {
    color: #c586c0; /* Magenta */
}
pre code .php-variable {
    color: #9cdcfe; /* Light blue */
}
pre code .php-string {
    color: #ce9178; /* Orange */
}
pre code .php-function {
    color: #dcdcaa; /* Yellow */
}
pre code .php-class {
    color: #4ec9b0; /* Teal */
}
pre code .php-number {
    color: #b5cea8; /* Olive */
}
pre code .html-tag {
    color: #569cd6; /* Blue */
}
pre code .html-attr {
    color: #9cdcfe; /* Light blue */
}
pre code .html-value {
    color: #ce9178; /* Orange */
}