:root {
    --primary: #00ff88;
    --secondary: #003b27;
    --dark: #0a0a0a;
    --light: #e0e0e0;
    --glow: 0 0 10px var(--primary), 0 0 20px var(--primary);
}

html {
    scroll-behavior: smooth;
}

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

body {
    background: #0000 url('image.png') no-repeat center center;
    background-size: cover;
    color: var(--light);
    font-family: 'Rajdhani', Orbitron;
    overflow-x: hidden;
}

h1,
h2,
h3,
h4 {
    font-family: 'Orbitron', sans-serif;
    text-transform: uppercase;
    letter-spacing: 2px;
    text-align: center;
}

/* Navigation Bar Styles */
header {
    background-color: #00000084;  /* Dark blue background */
    padding: 1rem 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 
                0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.logo h1 {
    color: #00ff73;  /* Bright green accent */
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    font-size: 1.8rem;
    margin: 0;
    text-shadow: var(--glow);
    animation: pulse 1s infinite alternate; 
    letter-spacing: 1px;
    text-shadow: 0 0 8px rgba(0, 255, 115, 0.3);
}

.options ul {
    display: flex;
    gap: 2rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.options li {
    color: #e2e8f0;  /* Light gray text */
    font-family: 'Rajdhani', sans-serif;
    font-weight: 500;
    font-size: 1.1rem;
    letter-spacing: 0.5px;
    cursor: pointer;
    padding: 0.5rem 0;
    position: relative;
    transition: all 0.3s ease;
}

.options li:hover {
    color: #00ff73;  /* Green on hover */
    transform: translateY(-2px);
}

/* Animated underline effect */
.options li::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: #00ff73;
    transition: width 0.3s ease;
}

.options li:hover::after {
    width: 100%;
}

/* Active tab indicator */
.options li.active {
    color: #00ff73;
}

.options li.active::after {
    width: 100%;
}



/* WRITE CODE HERE */
.array-intro h1{
    font-size: 7rem;
    font-weight: 800;
    text-shadow: var(--glow);
    animation: pulse 1s infinite alternate; 
    margin: 30px auto;
}
.flex-centre-divided-into-left-and-right{
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: row;

    margin-top: 100px;
}
.flex-centre-divided-into-left-and-right .what-is-array-left-side{
    display: block;
    width: 550px;
    background-color:  #00ff731b;
    padding: 30px;
    border-radius: 20px;
    margin: 0px 30px;
}
.flex-centre-divided-into-left-and-right .what-is-array-left-side p{
    text-align: left;
    line-height: 25px;
    letter-spacing: 0.3px;
}
.flex-centre-divided-into-left-and-right .visual-structure-right-side img{
    width: 600px;
    margin: 0;
}
@keyframes pulse {
    0% {
        text-shadow: 0 0 10px var(--primary), 0 0 20px var(--primary);
    }

    50% {
        text-shadow: 0 0 15px var(--primary), 0 0 30px var(--primary);
    }

    100% {
        text-shadow: 0 0 10px var(--primary), 0 0 20px var(--primary);
    }
}
.real-life-example-centre{
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 160px auto;
    flex-direction: column;
}
.real-life-example-centre h3{
    font-size: 1.3rem;
    font-weight: 800;
    text-shadow: var(--glow);
    animation: pulse 1s infinite alternate; 
    margin: 20px auto;
}
.features-table-centre-of-screen{
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0px auto;
    flex-direction: column;
    margin-bottom: 70px;
}
.features-table-centre-of-screen h3{
    font-size: 1.3rem;
    font-weight: 800;
    text-shadow: var(--glow);
    animation: pulse 1s infinite alternate; 
    margin: 30px auto;

}
.features-table-centre-of-screen img{
    width: 600px;
}
.operations h3{
    font-size: 1.3rem;
    font-weight: 800;
    margin: 20px auto;
    margin-top: 150px;
}
.operations-centre-of-screen {
    display: flex;
    justify-content: center; /* Changed from space-around */
    align-items: flex-start; /* Changed from center for better card alignment */
    flex-direction: row;
    margin: 100px auto; /* Centered horizontally */
    max-width: 1200px; /* Changed from fixed width */
    width: 90%; /* More responsive */
    gap: 40px; /* Consistent spacing between columns */
    padding: 20px;
}
.operations-centre-of-screen .left-side-explanation{
    display: block;
    width: 900px;
    background-color:  #00ff731b;
    padding: 30px;
    border-radius: 20px;
    margin: 0px 30px;
}
.operations-centre-of-screen .left-side-explanation h4{
    font-size: large;
    text-align: left;
    margin-top: 30px;
    margin-bottom: 20px;
}
.operations-centre-of-screen .left-side-explanation p{
    text-align: left;
    margin: 4px 0px;
}
.operations-centre-of-screen .left-side-explanation .card{
    background: #00ff730f;
    padding: 20px 20px;
}
.operations-centre-of-screen .right-side-cheat-sheet{
    display: block;
    width: 500px;
    position: sticky;
    
}
.operations-centre-of-screen .right-side-cheat-sheet .cheat-sheet-links-codes{
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;

}
.operations-centre-of-screen .right-side-cheat-sheet .cheat-sheet-links-codes h4{
    margin-bottom: 50px;
    text-shadow: var(--glow);
    font-weight: bolder;
    font-size: x-large;
    animation: pulse 1s infinite alternate; 
}
.operations-centre-of-screen .right-side-cheat-sheet .cheat-sheet-links-codes a{
    background-color: #00ff73;
    display: flex;
    font-weight: 600;
    letter-spacing: 1px;
    justify-content: center;
    align-items: center;
    color: white;
    border: none;
    border-radius: 25px;
    width: 300px;
    height: 70px;
    margin: 70px auto;
    transition: 0.1s ease-in;
}
.operations-centre-of-screen .right-side-cheat-sheet .cheat-sheet-links-codes a:hover{
    transform: scale(1.05);
    cursor: pointer;
    box-shadow: var(--glow);
    background-color: #00813a;
}
.complexities-chart{
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    margin-bottom: 100px;
}
.complexities-chart h3{
    font-size: 1.3rem;
    font-weight: 800;
    margin: 20px auto;
    margin-top: 150px;  
}
.buttons a{
    background-color: #00ff73;
    display: flex;
    font-weight: 600;
    letter-spacing: 1px;
    justify-content: center;
    align-items: center;
    color: white;
    border: none;
    border-radius: 20px;
    width: 250px;
    height: 60px;
    margin: 70px auto;
    transition: 0.1s ease-in;
}
.buttons a:hover{
transform: scale(1.02);
    cursor: pointer;
    background-color: #00813a;
}












/* Cheat Sheet Styles */
.cheat-sheets {
    margin-top: 12rem;
    margin-bottom: 8rem;
    text-align: center;
}
.cheat-sheet-links {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: center;
    margin-top: 2rem;
}
.cheat-sheet-links a {
    background-color: var(--primary);
    color: black;
    font-weight: bold;
    padding: 1rem 2rem;
    border-radius: 10px;
    text-decoration: none;
    box-shadow: 0 0 10px var(--primary);
    transition: background-color 0.3s, transform 0.3s;
}
.cheat-sheet-links a:hover {
    background-color: #00ff884c;
    transform: scale(1.05);
}
.why-dsa {
    text-align: center;
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 4rem;
    height: 100vh;
    flex-direction: row;
    box-sizing: border-box;
    width: auto;
}
.left-side {
    flex: 1;
    font-size: 2rem;
    line-height: 1.5;
    font-weight: bold;
    text-transform: uppercase;
    width: 400px;
    text-align: left;
    margin-right: 40px;
}
.right-side {
    flex: 1;
    background-color: rgba(0, 255, 136, 0.15); /* green transparent */
    padding: 2rem;
    border-radius: 20px;
    font-size: 1.1rem;
    line-height: 1.6;
    color: white;
    font-weight: 500;
    width: min-content;
    line-height: 40px;
}

footer {
    text-align: center;
    padding: 2rem;
    background-color: rgba(0, 0, 0, 0.7);;
    color: var(--primary);
    font-size: 1rem;
    margin-top: 3rem;
    border: none;
}

/* Responsive adjustments */

/* TERMINAL STYLES */
.terminal {
    margin: 4rem auto;
    max-width: 850px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 15px 40px rgba(0, 255, 115, 0.15);
    border: 1px solid rgba(0, 255, 115, 0.2);
    background: #0a0f17;
}

.terminal-container {
    background: #0a0f17;
    color: #e0e0e0;
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.95rem;
    line-height: 1.7;
}

.terminal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 0, 0, 0.3);
    padding: 0.8rem 1.5rem;
    border-bottom: 1px solid rgba(0, 255, 115, 0.1);
}

.terminal-tabs {
    display: flex;
    gap: 0.8rem;
}

.tab-btn {
    background: transparent;
    color: #7a7a8c;
    border: none;
    padding: 0.5rem 1.2rem;
    border-radius: 6px;
    cursor: pointer;
    font-family: 'Rajdhani', sans-serif;
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.tab-btn::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: #00ff73;
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.tab-btn:hover {
    color: #d4d4d4;
}

.tab-btn.active {
    color: #00ff73;
    background: rgba(0, 255, 115, 0.1);
}

.tab-btn.active::before {
    transform: scaleX(1);
}

.terminal-controls {
    display: flex;
    gap: 0.6rem;
}

.control-dot {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.control-dot:hover {
    opacity: 1;
}

.red { background: #ff5f56; }
.yellow { background: #ffbd2e; }
.green { background: #27c93f; }

.terminal-body {
    padding: 1.8rem;
    min-height: 280px;
    max-height: 400px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: #00ff73 #0a0f17;
}

.terminal-body::-webkit-scrollbar {
    width: 6px;
}

.terminal-body::-webkit-scrollbar-track {
    background: #0a0f17;
}

.terminal-body::-webkit-scrollbar-thumb {
    background-color: #00ff73;
    border-radius: 3px;
}

.code-display {
    display: none;
    margin: 0;
    white-space: pre-wrap;
    tab-size: 4;
}

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

@keyframes fadeIn {
    from { opacity: 0.5; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

.code-comment {
    color: #6a9955;
    font-style: italic;
}

.code-keyword {
    color: #569cd6;
    font-weight: bold;
}

.code-string {
    color: #ce9178;
}

.code-function {
    color: #dcdcaa;
}

.code-number {
    color: #b5cea8;
}

.code-operator {
    color: #d4d4d4;
    font-weight: bold;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .terminal {
        margin: 2rem auto;
        border-radius: 8px;
    }
    
    .terminal-header {
        padding: 0.6rem 1rem;
    }
    
    .terminal-tabs {
        gap: 0.4rem;
    }
    
    .tab-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
    
    .terminal-body {
        padding: 1.2rem;
        min-height: 220px;
    }
}