/* ===== Global CSS Variables ===== */

:root {
    --primary-color: #0559CF;
    --primary-light: #A8CCFF;
    --primary-dark: #084aa7;
    --secondary-color: #0B81CA;
    --text-color: #333;
    --text-light: #666;
    --text-lighter: #999;
    --light-bg: #f0f8ff;
    --white: #fff;
    --black: #000;
    --gray-100: #f8f9fa;
    --gray-200: #f5f7fa;
    --gray-300: #e1e5eb;
    --code-bg: #1e1e1e;
    --code-text: #ccc;
    --code-highlight: #7ec5ff;
    --border-color: #ddd;
    /* Shadows */
    --shadow-light: 0 3px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 5px 15px rgba(0, 0, 0, 0.15);
    --shadow-dark: 0 0 30px rgba(0, 0, 0, 0.2);
    /* Transitions */
    --transition-fast: all 0.3s ease;
    --transition-medium: all 0.4s ease;
    --transition-slow: all 0.5s ease;
    /* Border Radius */
    --border-radius-sm: 5px;
    --border-radius-md: 10px;
    --border-radius-lg: 15px;
}


/* ===== Base Styles ===== */

* {
    scroll-behavior: smooth;
    padding: 0;
    margin: 0;
    font-family: 'Poppins', sans-serif;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    display: flex;
    scroll-behavior: smooth;
    color: var(--text-color);
    background-color: var(--gray-100);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}


/* ===== Header Styles ===== */

.header {
    background: linear-gradient(to right, var(--primary-color), var(--primary-dark));
    color: var(--white);
    text-align: center;
    padding: 10px;
    font-size: 16px;
    font-weight: bold;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 100;
    box-shadow: var(--shadow-light);
}


/* ===== Container & Layout ===== */

.container {
    display: flex;
    width: 100%;
    margin-top: 80px;
}


/* ===== Sidebar Styles ===== */

#togglesidebar {
    position: fixed;
    top: 15px;
    left: 15px;
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: var(--border-radius-sm);
    padding: 8px 12px;
    font-size: 18px;
    cursor: pointer;
    z-index: 200;
    transition: var(--transition-fast);
}

#togglesidebar:hover {
    background-color: var(--primary-dark);
}

.sidebar {
    width: 250px;
    background: var(--white);
    color: var(--text-color);
    padding: 25px;
    height: 100vh;
    position: fixed;
    left: 0;
    top: 60px;
    overflow-y: auto;
    transition: var(--transition-medium);
    box-shadow: var(--shadow-light);
    border-right: 1px solid var(--border-color);
}

.sidebar.closed {
    width: 0;
    padding: 0;
    overflow: hidden;
}

.sidebar h2 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-light);
}

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

.sidebar ul li {
    padding: 8px 0;
    border-bottom: 1px solid var(--gray-300);
}

.sidebar ul li a {
    color: var(--text-color);
    text-decoration: none;
    display: block;
    padding: 8px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
}

.sidebar ul li a:hover {
    color: var(--primary-color);
    background-color: var(--light-bg);
    padding-left: 15px;
}

.sidebar .sup {
    margin-left: 15px;
    display: none;
}


/* ===== Main Content Styles ===== */

.content {
    margin-left: 250px;
    padding: 30px;
    flex-grow: 1;
    transition: var(--transition-medium);
    max-width: 1200px;
    background-color: var(--white);
    box-shadow: var(--shadow-light);
    border-radius: var(--border-radius-md);
    margin-right: 20px;
    margin-bottom: 30px;
}

.content.shifted {
    margin-left: 20px;
}

.content h1 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 30px;
    font-size: 2.5rem;
    border-bottom: 3px solid var(--primary-light);
    padding-bottom: 10px;
}

.content h2 {
    color: var(--primary-dark);
    text-align: center;
    margin: 30px 0 20px;
    font-size: 2rem;
}

.content section {
    padding: 25px 0;
    border-bottom: 1px solid var(--gray-300);
    margin-bottom: 20px;
}


/* ===== Typography ===== */

p {
    margin-bottom: 15px;
    font-size: 16px;
    line-height: 1.7;
}

p strong {
    color: var(--primary-dark);
    font-size: 1.1em;
}

ul,
ol {
    margin-left: 25px;
    margin-bottom: 20px;
}

li {
    margin-bottom: 8px;
}


/* ===== Code Blocks ===== */

pre.span1 {
    color: var(--code-text);
    background-color: var(--code-bg);
    padding: 20px;
    border-radius: var(--border-radius-md);
    overflow-x: auto;
    margin: 20px 0;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 14px;
    line-height: 1.5;
    box-shadow: var(--shadow-light);
    border-left: 4px solid var(--primary-color);
}

.span2 {
    color: var(--code-text);
    background-color: var(--code-highlight);
    padding: 2px 5px;
    border-radius: 3px;
}

code {
    background: var(--light-bg);
    padding: 3px 6px;
    border-radius: 4px;
    font-family: 'Consolas', 'Monaco', monospace;
    color: var(--primary-dark);
    font-size: 0.9em;
}


/* ===== Tables ===== */

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    box-shadow: var(--shadow-light);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
    -webkit-border-radius: var(--border-radius-sm);
    -moz-border-radius: var(--border-radius-sm);
    -ms-border-radius: var(--border-radius-sm);
    -o-border-radius: var(--border-radius-sm);
}

thead {
    background: var(--primary-color);
    color: var(--white);
}

th,
td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--gray-300);
}

tbody tr:nth-child(even) {
    background-color: var(--gray-200);
}

tbody tr:hover {
    background-color: var(--gray-300);
}


/* ===== iframes ===== */

iframe {
    width: 100%;
    height: 500px;
    border-radius: var(--border-radius-md);
    border: none;
    box-shadow: var(--shadow-medium);
    margin: 20px 0;
}


/* ===== Quiz Button ===== */

.btnquiz {
    text-align: center;
    margin: 30px 0;
}

.btnquiz button {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 12px 25px;
    font-size: 16px;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-light);
}

.btnquiz button:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.btnquiz a {
    color: var(--white);
    text-decoration: none;
}


/* ===== Responsive Design ===== */

@media screen and (max-width: 992px) {
    .sidebar {
        width: 220px;
    }
    .content {
        margin-left: 220px;
        padding: 20px;
    }
}

@media screen and (max-width: 768px) {
    .sidebar {
        width: 0;
        padding: 0;
        overflow: hidden;
    }
    .content {
        margin-left: 0;
        margin-right: 0;
        border-radius: 0;
    }
    .content.shifted {
        margin-left: 0;
    }
    #togglesidebar {
        display: block;
    }
    .sidebar.closed {
        width: 0;
    }
    .sidebar:not(.closed) {
        width: 250px;
        padding: 20px;
    }
}


/* ===== Back to Top Button ===== */

.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--primary-color);
    color: var(--white);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    opacity: 0;
    transition: var(--transition-fast);
    z-index: 99;
    box-shadow: var(--shadow-medium);
}

.back-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
}

.back-to-top.visible {
    opacity: 1;
}


/* ===== Preloader ===== */

.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--white);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: var(--transition-medium);
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid var(--gray-300);
    border-top: 5px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}