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

:root {
    --sepia-dark: #2c1810;
    --sepia-medium: #5d4037;
    --sepia-light: #8d6e63;
    --sepia-lighter: #bcaaa4;
    --sepia-lightest: #efefe9;
    --sepia-accent: #d7ccc8;
    --terminal-bg: #1a1a1a;
    --terminal-green: #00ff41;
    --hover-gold: #ffd54f;
    --link-blue: #007bff;
    --cisco-blue: #049fd9;
    --cisco-dark: #005073;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--sepia-lightest) 0%, var(--sepia-accent) 100%);
    color: var(--sepia-dark);
    line-height: 1.6;
    min-height: 100vh;
}

/* Header */
.header {
    background: linear-gradient(45deg, var(--sepia-dark), var(--sepia-medium));
    color: var(--sepia-lightest);
    padding: 1rem 0;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    max-width: 1200px; /* 1300px */
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    transition: all 0.3s ease;
    cursor: default;
}

.logo-img {
    width: 40px;
    height: 40px;
    margin-right: 0.5rem;
    object-fit: contain;
    border-radius: 8px;
}

.logo i {
    margin-right: 0.5rem;
    font-size: 2rem;
    color: var(--hover-sepia-lightest);
}

.logo:hover {
    transform: translateY(-2px);
    color: white;
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.7); /* Beyaz parlama efekti */
    /* box-shadow: 0 8px 24px rgba(0,0,0,0.15); */
}

.navbar ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.navbar a {
    color: var(--sepia-lightest);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    transition: all 0.5s ease;
    font-weight: bold;
    display: inline-block;
}

.navbar a::before {
    content: '';
    position: absolute;
    top: 0;
    width: 100%;
    height: 100%;
    transition: all 0.5s ease;
}

.navbar a:hover {
    transform: translateY(-2px);
    color: white;
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.7); /* Beyaz parlama efekti */

    /* background: rgba(255, 213, 79, 0.2); */
    /* transform: translateY(-2px); */
}

/* Hero Banner */
.hero {
    background: linear-gradient(135deg, var(--sepia-medium), var(--sepia-light));
    color: var(--sepia-lightest);
    text-align: center;
    padding: 4rem 2rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 100" fill="%23ffffff" opacity="0.1"><polygon points="0,0 1000,0 1000,100 0,80"/></svg>');
    background-size: cover;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    animation: fadeInUp 1s ease;
}

.hero p {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto;
    animation: fadeInUp 1s ease 0.3s both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Main Layout */
.container {
    max-width: 1200px; /* 1300px */
    margin: 2rem auto;
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 2rem;
    padding: 0 2rem;
}

/* Sidebar */
.sidebar {
    background: rgba(255, 255, 255, 0.8);
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
    backdrop-filter: blur(10px);
    height: fit-content;
    position: sticky;
    top: 120px;
}

.sidebar h3 {
    color: var(--sepia-medium);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--sepia-accent);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.accordion-item {
    margin-bottom: 0.5rem;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.accordion-header {
    background: var(--sepia-light);
    color: white;
    padding: 1rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
    user-select: none;
}

.accordion-header:hover {
    background: var(--sepia-medium);
    transform: translateX(5px);
}

.accordion-header.active {
    background: var(--sepia-dark);
}

/* .accordion-icon {
    transition: transform 0.3s ease;
}

.accordion-header.active .accordion-icon {
    transform: rotate(180deg);
} */

.accordion-header i.fa-chevron-right {
    transition: transform 0.3s ease;
    /* margin-right: 3px; */
}

.accordion-header.active i.fa-chevron-right {
    transform: rotate(90deg);
}

.accordion-content {
    background: white;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.accordion-content.active {
    max-height: 500px;
}

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

.accordion-content li {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--sepia-accent);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.accordion-content li i {
    color: var(--sepia-light);
    width: 16px;
    text-align: center;
}

.accordion-content li:hover {
    background: var(--sepia-lightest);
    padding-left: 1.5rem;
    color: var(--sepia-dark);
}
.accordion-content li:hover i {
    color: var(--sepia-medium);
}

.accordion-content li:last-child {
    border-bottom: none;
}

/* Main Content */
.main-content {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
    backdrop-filter: blur(10px);
    min-height: 500px;
}

.content-section {
    margin-bottom: 3rem;
}

.content-section h2 {
    color: var(--sepia-dark);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--sepia-accent);
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.8rem;
}

.content-section h2::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--hover-gold);
}

.problem-card {
    background: linear-gradient(135deg, #fff, var(--sepia-lightest));
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
    border-left: 4px solid var(--sepia-medium);
    transition: all 0.3s ease;
}

.problem-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}

.problem-card h3 {
    color: var(--sepia-medium);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.problem-card h4 {
    color: var(--sepia-medium);
    margin-top: 0.75rem;
    margin-bottom: 0.5rem; /* Added for spacing before slideshow */
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.terminal {
    background: var(--terminal-bg);
    color: var(--terminal-green);
    padding: 1rem;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    margin: 1rem 0;
    position: relative;
    overflow-x: auto;
}

.terminal-header {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 30px;
    background: #333;
    border-radius: 8px 8px 0 0;
    display: flex;
    align-items: center;
    padding: 0 10px;
}

.terminal-button {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin-right: 5px;
}
.terminal-button.red { background: #ff5f56; }
.terminal-button.yellow { background: #ffbd2e; }
.terminal-button.green { background: #27c93f; }

.terminal-content {
    margin-top: 30px;
    padding-top: 0.5rem;
}

.command {
    display: block;
    margin: 0.5rem 0;
    white-space: pre-wrap;
    word-break: break-all;
}

.command::before {
    content: '$ ';
    color: var(--hover-gold);
}

.solution-steps {
    counter-reset: step-counter;
    margin-top: 1rem;
}

.step {
    counter-increment: step-counter;
    background: white;
    border-radius: 8px;
    padding: 1rem;
    margin: 1rem 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    position: relative;
    padding-left: 3rem;
    transition: all 0.3s ease;
}

.step::before {
    content: counter(step-counter);
    position: absolute;
    left: 1rem;
    top: 1rem;
    background: var(--sepia-medium);
    color: white;
    width: 25px;
    height: 25px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.9rem;
}

.step:hover {
    background: var(--sepia-lightest);
    transform: translateX(5px);
}

.simulation-note {
    background: var(--sepia-lightest);
    border-left: 4px solid var(--hover-gold);
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
}

.simulation-note i {
    margin-right: 0.5rem;
    color: var(--sepia-medium);
}

.simulation-note a i {
    margin-right: 0.5rem;
    color: var(--hover-gold); /* This was conflicting with download button icon color */
}

/* Download Button */
.download-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: var(--sepia-dark);
    color: var(--sepia-lightest) !important; /* Ensure icon color override */
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    margin-top: 1rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    /* border: none; */
    border: 3px solid var(--sepia-dark);
    cursor: pointer;
}

.download-button i {
    color: var(--sepia-lightest) !important; /* Ensure icon color is correct */
}

.download-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
    background: var(--sepia-lightest);
    color: var(--sepia-dark) !important; /* Ensure icon color override */
}

.download-button:hover i {
    color: var(--sepia-dark) !important; /* Ensure icon color is correct on hover */
}

.download-button:active {
    transform: translateY(-1px);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.2);
}

.download-button i {
    font-size: 1.2rem;
}

/* Issue Card */
.issue-card {
    background: white;
    border-radius: 10px;
    padding: 1.25rem;
    margin: 1rem 0;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    border-left: 4px solid var(--sepia-light);
}

.issue-card h4 {
    color: var(--sepia-dark);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.issue-card p {
    margin-bottom: 0.75rem;
}

.issue-card h5 {
    font-size: 1rem;
    color: var(--sepia-medium);
    margin: 1rem 0 0.5rem 0;
}

/* Footer */
.footer {
    background: var(--sepia-dark);
    color: var(--sepia-lightest);
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    color: var(--sepia-lightest);
    font-size: 1.5rem;
    padding: 0.5rem;
    border-radius: 50%;
    background: var(--sepia-medium);
    transition: all 0.3s ease;
    text-decoration: none;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.social-links a:hover {
    background: var(--hover-gold);
    color: var(--sepia-dark);
    transform: translateY(-3px) scale(1.1);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 0 1rem;
    }

    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    .navbar ul {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .sidebar {
        position: static;
        top: auto;
        margin-bottom: 1.5rem;
    }
    .main-content {
        padding: 1.5rem;
    }
}

/* Animation classes */
.fade-in {
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.slide-in {
    animation: slideIn 0.5s ease;
}

@keyframes slideIn {
    from { transform: translateX(-20px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Loading Indicator */
.loading-indicator {
    text-align: center;
    padding: 2rem;
    font-size: 1.2rem;
    color: var(--sepia-medium);
}
.loading-indicator i {
    margin-right: 0.5rem;
    animation: spin 1.5s linear infinite;
}
@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Additional CSS animations */
@keyframes typewriter {
    from { width: 0; }
    to { width: 100%; }
}

.terminal:hover {
    box-shadow: 0px 0px 20px rgba(0, 255, 65, 0.3);
}

/* Pulse animation for active elements */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.accordion-header:active {
    animation: pulse 0.3s ease;
}

/* Gradient text for special elements */
.gradient-text {
    background: linear-gradient(45deg, var(--sepia-medium), var(--hover-gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Cisco Packet Tracer Logo */
.cisco-logo {
    display: inline-block;
    margin-right: 0.5rem;
    width: 24px;
    height: 24px;
    background-image: url('data:image/svg+xml;base64,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');
    background-size: contain;
    background-repeat: no-repeat;
}

/* Tab System for Multiple Issues */
.tab-container {
    margin: 1.5rem 0;
}

.tab-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tab-button {
    padding: 0.5rem 1rem;
    background: var(--sepia-lightest);
    border: 1px solid var(--sepia-lighter);
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-button:hover {
    background: var(--sepia-lighter);
}

.tab-button.active {
    background: var(--sepia-medium);
    color: white;
    border-color: var(--sepia-medium);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

/* Slideshow CSS Integration */
.slideshow-wrapper {
    position: relative;
    margin: 1rem 0;
    padding: 1rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.slideshow-wrapper:hover {
    /* transform: translateX(5px); */
    transform: translateY(-2px);
    box-shadow: 0 0px 20px rgb(255, 79, 79);
}

.slideshow-wrapper h3 {
    color: var(--sepia-medium);
    margin-bottom: 1rem;
    margin-top: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--sepia-accent);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.slideshow-container {
    max-width: 100%;
    position: relative;
    margin: auto;
    border-radius: 8px;
    overflow: hidden;
}

/* Hide the images by default */
.mySlides {
    display: none;
    cursor: pointer;
}

/* Show the active slide */
.mySlides.active {
    display: block;
}

/* Next & previous buttons */
.prev, .next {
    cursor: pointer;
    position: absolute;
    top: 50%;
    width: auto;
    margin-top: -22px;
    padding: 16px;
    color: white;
    font-weight: bold;
    font-size: 18px;
    transition: 0.5s ease;
    border-radius: 0 3px 3px 0;
    user-select: none;
    background-color: rgba(0,0,0,0.5);
    z-index: 10;
}

/* Position the "next button" to the right */
.next {
    right: 0;
    border-radius: 3px 0 0 3px;
}

/* On hover, add a black background color with a little bit see-through */
.prev:hover, .next:hover {
    background-color: rgba(0,0,0,0.8);
}

/* Caption text */
.text {
    color: #f2f2f2;
    font-size: 15px;
    padding: 8px 12px;
    position: absolute;
    bottom: 0px;
    width: 100%;
    text-align: center;
    background-color: rgba(0,0,0,0.5);
}

/* Number text (1/3 etc) */
.numbertext {
    color: #f2f2f2;
    font-size: 12px;
    padding: 8px 12px;
    position: absolute;
    top: 0;
    background-color: rgba(0,0,0,0.5);
    z-index: 5;
}

/* The dots/bullets/indicators */
.dots-container {
    text-align: center;
    padding: 10px 0;
}

.dot {
    cursor: pointer;
    height: 15px;
    width: 15px;
    margin: 0 5px;
    background-color: #bbb;
    border-radius: 50%;
    display: inline-block;
    transition: background-color 0.5s ease;
}

.active-dot, .dot:hover {
    background-color: #717171;
}

/* Fading animation */
.fade {
    animation-name: fade;
    animation-duration: 1.5s;
}

@keyframes fade {
    from {opacity: .4}
    to {opacity: 1}
}

/* Image styling */
.slide-image {
    width: 100%;
    height: auto;
    max-height: 450px;
    object-fit: contain;
    display: block;
    border-radius: 4px;
}

/* Modal styles for enlarged image view */
.modal {
    display: none;
    position: fixed;
    z-index: 1050;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.9);
    transition: all 0.3s ease;
}

.modal-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 90vh;
    margin-top: 50px;
}

.modal-caption {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
    text-align: center;
    color: #ccc;
    padding: 10px 0;
    height: 150px;
}

.close {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
    z-index: 1060;
}

.close:hover,
.close:focus {
    color: #bbb;
    text-decoration: none;
    cursor: pointer;
}

/* Modal navigation buttons */
.modal-prev, .modal-next {
    cursor: pointer;
    position: absolute;
    top: 50%;
    width: auto;
    padding: 16px;
    margin-top: -50px;
    color: white;
    font-weight: bold;
    font-size: 30px;
    transition: 0.5s ease;
    border-radius: 0 3px 3px 0;
    user-select: none;
    background-color: rgba(0,0,0,0.5);
    z-index: 1060;
}

.modal-next {
    right: 0;
    border-radius: 3px 0 0 3px;
}

.modal-prev {
    left: 0;
}

.modal-prev:hover, .modal-next:hover {
    background-color: rgba(0,0,0,0.8);
}

/* Responsive modal */
@media only screen and (max-width: 700px) {
    .modal-content {
        width: 100%;
        max-height: 80vh;
    }
    .close {
        top: 10px;
        right: 20px;
        font-size: 30px;
    }
    .modal-prev, .modal-next {
        padding: 10px;
        font-size: 24px;
    }
}

/* Active accordion item styling */
.accordion-content li.active {
    background: var(--sepia-lightest);
    color: var(--sepia-dark);
    border-left: 3px solid var(--sepia-medium);
}

.accordion-content li.active i {
    color: var(--sepia-dark);
}