/* ========================================
   POWERSHELL EBOOK - COMPLETE STYLES
   Version: 3.0 Final - Modern Header
   Author: Mahammad Haneef
   Date: June 2026
   ======================================== */

/* ========================================
   GLOBAL STYLES & CSS VARIABLES
   ======================================== */
:root {
    /* Primary Colors */
    --primary-blue: #0078D4;
    --primary-dark: #005A9E;
    --primary-light: #50E6FF;
    
    /* Background Colors */
    --bg-main: #FFFFFF;
    --bg-sidebar: #F8F9FA;
    --bg-header: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
    --bg-footer: #34495E;
    --bg-code: #1E1E1E;
    --bg-highlight: #FFF9C4;
    --bg-success: #E8F5E9;
    --bg-warning: #FFF3E0;
    --bg-info: #E3F2FD;
    
    /* Text Colors */
    --text-primary: #2C3E50;
    --text-secondary: #7F8C8D;
    --text-light: #FFFFFF;
    --text-code: #D4D4D4;
    
    /* Accent Colors */
    --success: #4CAF50;
    --warning: #FF9800;
    --error: #F44336;
    --info: #2196F3;
    
    /* Spacing */
    --header-height: 80px;
    --footer-height: 60px;
    --sidebar-width: 300px;
    
    /* Transitions */
    --transition-speed: 0.3s;
}

/* Dark Mode Variables */
[data-theme="dark"],
body.dark-mode {
    --bg-main: #1E1E1E;
    --bg-sidebar: #252526;
    --bg-header: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --bg-footer: #252526;
    --text-primary: #E0E0E0;
    --text-secondary: #B0B0B0;
    --bg-success: #1B5E20;
    --bg-warning: #E65100;
    --bg-info: #01579B;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-main);
    overflow: hidden;
    transition: background 0.3s ease, color 0.3s ease;
}

/* ========================================
   MODERN HEADER STYLES
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--bg-header);
    color: var(--text-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
    text-decoration: none;
    color: var(--text-light);
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: translateY(-2px);
}

.logo-icon {
    font-size: 2.5em;
    animation: float 3s ease-in-out infinite;
    filter: drop-shadow(0 4px 8px rgba(80, 230, 255, 0.4));
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

.logo > div {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.logo > div > div:first-child {
    font-size: 1.5em;
    font-weight: 700;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.book-title {
    font-size: 0.85em;
    opacity: 0.9;
    font-weight: 400;
    letter-spacing: 0.3px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 30px;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 5px;
}

.header-nav a {
    color: var(--text-light);
    text-decoration: none;
    padding: 10px 18px;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.95em;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.header-nav a::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.header-nav a:hover::before {
    transform: translateY(0);
}

.header-nav a:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.controls {
    display: flex;
    gap: 8px;
}

.btn-control {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-light);
    padding: 10px 14px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1.1em;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.btn-control::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-control:hover::before {
    width: 200px;
    height: 200px;
}

.btn-control:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
    border-color: rgba(255, 255, 255, 0.4);
}

.btn-control:active {
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

/* ========================================
   MAIN CONTAINER
   ======================================== */
.main-container {
    display: flex;
    margin-top: var(--header-height);
    height: calc(100vh - var(--header-height) - var(--footer-height));
}

/* ========================================
   SIDEBAR STYLES
   ======================================== */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    border-right: 1px solid #ddd;
    overflow-y: auto;
    padding: 20px;
    position: fixed;
    left: 0;
    height: calc(100vh - var(--header-height) - var(--footer-height));
    transition: transform var(--transition-speed);
}

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

.sidebar h2 {
    color: var(--primary-blue);
    font-size: 1.3em;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-blue);
}

.progress-bar {
    background: #E0E0E0;
    height: 8px;
    border-radius: 10px;
    margin-bottom: 20px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    background: linear-gradient(90deg, var(--primary-blue), var(--primary-light));
    height: 100%;
    width: 7%;
    transition: width 0.5s ease;
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 20px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3));
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

.progress-text {
    font-size: 0.85em;
    color: var(--text-secondary);
    margin-bottom: 15px;
    text-align: center;
}

.toc {
    list-style: none;
}

.toc-section {
    margin-bottom: 20px;
}

.toc-section-title {
    font-weight: 700;
    color: var(--primary-dark);
    font-size: 0.95em;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 8px;
    border-radius: 5px;
    transition: background var(--transition-speed);
}

.toc-section-title:hover {
    background: rgba(0,120,212,0.1);
}

.toc-section-title .icon {
    font-size: 1.2em;
}

.toc-chapters {
    list-style: none;
    margin-left: 25px;
}

.toc-chapters li {
    margin: 5px 0;
}

.toc-chapters a {
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: 5px;
    font-size: 0.9em;
    transition: all var(--transition-speed);
}

.toc-chapters a:hover {
    background: rgba(0,120,212,0.1);
    padding-left: 18px;
}

.toc-chapters a.active {
    background: var(--primary-blue);
    color: white;
    font-weight: 600;
}

.toc-chapters a.completed {
    color: #10b981;
    font-weight: 600;
}

.toc-chapters a.completed .checkmark {
    color: #10b981;
    font-weight: bold;
    margin-left: 5px;
}

.chapter-icon {
    font-size: 1em;
}

/* ========================================
   CONTENT AREA STYLES
   ======================================== */
.content {
    margin-left: var(--sidebar-width);
    flex: 1;
    overflow-y: auto;
    padding: 40px 60px;
    background: var(--bg-main);
    transition: margin-left var(--transition-speed);
}

.content.expanded {
    margin-left: 0;
}

.chapter {
    display: none;
    animation: fadeIn 0.5s ease;
}

.chapter.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Chapter Elements */
.chapter h1 {
    color: var(--primary-blue);
    font-size: 2.5em;
    margin-bottom: 20px;
    border-bottom: 4px solid var(--primary-blue);
    padding-bottom: 15px;
}

.chapter h2 {
    color: var(--primary-blue);
    font-size: 1.8em;
    margin-top: 40px;
    margin-bottom: 20px;
    border-left: 5px solid var(--primary-blue);
    padding-left: 15px;
}

.chapter h3 {
    color: var(--primary-dark);
    font-size: 1.4em;
    margin-top: 30px;
    margin-bottom: 15px;
}

.chapter p {
    margin: 15px 0;
    text-align: justify;
}

.chapter ul, .chapter ol {
    margin: 15px 0;
    padding-left: 40px;
}

.chapter li {
    margin: 8px 0;
}

/* Special Boxes */
.metadata {
    background: var(--bg-info);
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    border-left: 5px solid var(--info);
}

.objectives {
    background: var(--bg-success);
    padding: 25px;
    border-radius: 8px;
    margin: 30px 0;
    border-left: 5px solid var(--success);
}

.objectives h2 {
    color: var(--success);
    margin-top: 0;
    border: none;
    padding: 0;
}

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

.objectives li {
    padding-left: 30px;
    position: relative;
}

.objectives li:before {
    content: "✅";
    position: absolute;
    left: 0;
}

.info-box {
    background: var(--bg-info);
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    border-left: 5px solid var(--info);
}

.warning-box {
    background: var(--bg-warning);
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    border-left: 5px solid var(--warning);
}

/* ========================================
   CODE BLOCKS
   ======================================== */
.code-block {
    position: relative;
    margin: 20px 0;
    transition: all 0.3s ease;
}

.code-block:hover {
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.code-header {
    background: linear-gradient(135deg, #1e293b, #334155);
    color: #94a3b8;
    padding: 10px 15px;
    border-radius: 8px 8px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9em;
}

.code-header span {
    font-weight: 600;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-copy {
    background: var(--primary-blue);
    color: white;
    border: none;
    padding: 5px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85em;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-copy:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn-copy:active {
    transform: translateY(0);
}

.btn-copy.copied {
    background: #10b981 !important;
    color: white !important;
}

pre {
    background: var(--bg-code);
    color: var(--text-code);
    padding: 20px;
    border-radius: 0 0 8px 8px;
    overflow-x: auto;
    margin: 0;
    border-left: 4px solid var(--primary-blue);
}

code {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9em;
}

/* ========================================
   TABLES
   ======================================== */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 25px 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

th {
    background: var(--primary-blue);
    color: white;
    padding: 15px;
    text-align: left;
    font-weight: 600;
}

td {
    padding: 12px 15px;
    border-bottom: 1px solid #ddd;
}

tr:hover {
    background: rgba(0,120,212,0.05);
}

/* ========================================
   QUIZ & EXERCISE STYLES
   ======================================== */
.quiz-question {
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

body.dark-mode .quiz-question {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.quiz-question:last-of-type {
    border-bottom: none;
    margin-bottom: 3rem;
}

.exercise {
    background: #F3E5F5;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    border-left: 5px solid #9C27B0;
}

.exercise h4 {
    color: #7B1FA2;
    margin-bottom: 10px;
}

.show-answer {
    background: var(--primary-blue);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    margin-top: 10px;
}

.show-answer:hover {
    background: var(--primary-dark);
    transform: translateX(5px);
}

.show-answer.active {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    box-shadow: 0 4px 8px rgba(16, 185, 129, 0.3);
}

.show-answer.active::before {
    content: "👁️ ";
}

.answer {
    animation: slideDown 0.3s ease;
    overflow: hidden;
    margin-top: 15px;
}

@keyframes slideDown {
    from {
        opacity: 0;
        max-height: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        max-height: 1000px;
        transform: translateY(0);
    }
}

details {
    margin: 15px 0;
    padding: 15px;
    background: #F9F9F9;
    border-radius: 5px;
    border-left: 3px solid #9C27B0;
}

summary {
    cursor: pointer;
    font-weight: 600;
    color: #7B1FA2;
    padding: 5px;
}

summary:hover {
    color: #9C27B0;
}

/* ========================================
   NAVIGATION BUTTONS
   ======================================== */
.chapter-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 50px;
    padding-top: 30px;
    border-top: 2px solid #ddd;
}

.btn-nav {
    background: var(--primary-blue);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all var(--transition-speed);
}

.btn-nav:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,120,212,0.3);
}

.btn-nav:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
}

/* ========================================
   NOTIFICATION SYSTEM
   ======================================== */
.notification {
    position: fixed;
    top: 100px;
    right: 20px;
    padding: 15px 25px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transform: translateX(400px);
    transition: transform 0.3s ease;
    z-index: 10000;
    max-width: 300px;
    word-wrap: break-word;
}

.notification.show {
    transform: translateX(0);
}

.notification-success {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

.notification-error {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
}

.notification-warning {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white;
}

.notification-info {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: white;
}

body.dark-mode .notification {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

/* ========================================
   FOOTER STYLES
   ======================================== */
.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--footer-height);
    background: var(--bg-footer);
    color: var(--text-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 30px;
    font-size: 0.9em;
    z-index: 1000;
}

.footer-left, .footer-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.footer a {
    color: var(--primary-light);
    text-decoration: none;
    transition: color var(--transition-speed);
}

.footer a:hover {
    color: white;
}

/* ========================================
   SCROLL TO TOP BUTTON
   ======================================== */
.scroll-to-top {
    position: fixed;
    bottom: 80px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
    z-index: 999;
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 16px rgba(59, 130, 246, 0.4);
}

/* ========================================
   TOOLTIP STYLES
   ======================================== */
[data-tooltip] {
    position: relative;
    cursor: help;
}

[data-tooltip]::before {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-5px);
    padding: 8px 12px;
    background: rgba(0, 0, 0, 0.9);
    color: white;
    font-size: 12px;
    border-radius: 6px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
    z-index: 1000;
}

[data-tooltip]:hover::before {
    opacity: 1;
    transform: translateX(-50%) translateY(-10px);
}

/* ========================================
   LOADING ANIMATION
   ======================================== */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.text-center {
    text-align: center;
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}

/* ========================================
   SCROLLBAR STYLING
   ======================================== */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-blue);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

body.dark-mode ::-webkit-scrollbar-track {
    background: #1e1e1e;
}

body.dark-mode ::-webkit-scrollbar-thumb {
    background: #3b82f6;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 250px;
    }
    
    .content {
        padding: 30px 40px;
    }
    
    .header {
        padding: 0 25px;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 70px;
    }
    
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-speed);
        z-index: 999;
    }
    
    .sidebar.mobile-open {
        transform: translateX(0);
    }
    
    .content {
        margin-left: 0;
        padding: 20px;
    }
    
    .header {
        padding: 0 15px;
    }
    
    .logo-icon {
        font-size: 2em;
    }
    
    .logo > div > div:first-child {
        font-size: 1.2em;
    }
    
    .book-title {
        font-size: 0.75em;
    }
    
    .header-nav {
        display: none;
    }
    
    .controls {
        gap: 5px;
    }
    
    .btn-control {
        padding: 8px 10px;
        font-size: 1em;
    }
    
    .chapter h1 {
        font-size: 2em;
    }
    
    .notification {
        top: 80px;
        right: 10px;
        left: 10px;
        max-width: none;
        transform: translateY(-100px);
    }
    
    .notification.show {
        transform: translateY(0);
    }
    
    .code-block:hover {
        transform: none;
    }
}

@media (max-width: 480px) {
    .logo > div > div:first-child {
        font-size: 1em;
    }
    
    .book-title {
        display: none;
    }
    
    .btn-control {
        padding: 6px 8px;
        font-size: 0.9em;
    }
    
    .chapter h1 {
        font-size: 1.6em;
    }
    
    .chapter h2 {
        font-size: 1.4em;
    }
}

/* ========================================
   PRINT STYLES
   ======================================== */
@media print {
    .sidebar,
    .header,
    .footer,
    .btn-copy,
    .show-answer,
    .chapter-nav,
    .notification,
    .scroll-to-top,
    .controls {
        display: none !important;
    }
    
    .content {
        margin-left: 0;
        padding: 0;
    }
    
    .code-block {
        page-break-inside: avoid;
    }
    
    .answer {
        display: block !important;
    }
}

/* ========================================
   ACCESSIBILITY ENHANCEMENTS
   ======================================== */
*:focus {
    outline: 2px solid #3b82f6;
    outline-offset: 2px;
}

button:focus-visible {
    outline: 3px solid #3b82f6;
    outline-offset: 3px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .btn-copy,
    .show-answer,
    .btn-nav,
    .btn-control {
        border: 2px solid currentColor;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ========================================
   DARK MODE SPECIFIC ENHANCEMENTS
   ======================================== */
body.dark-mode .code-block:hover {
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
}

body.dark-mode .code-header {
    background: linear-gradient(135deg, #0f172a, #1e293b);
}

body.dark-mode .exercise {
    background: #2d1b3d;
}

body.dark-mode details {
    background: #2d2d2d;
}

body.dark-mode table {
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

body.dark-mode td {
    border-bottom: 1px solid #444;
}

body.dark-mode .sidebar {
    border-right: 1px solid #333;
}

body.dark-mode .metadata,
body.dark-mode .objectives,
body.dark-mode .info-box,
body.dark-mode .warning-box {
    background: rgba(59, 130, 246, 0.1);
}

/* ========================================
   END OF STYLESHEET
   ======================================== */