:root {
    --background: #1a1b26;
    --bg-rgb: 26, 27, 38;
    --surface-1: #24283b;
    --surface-2: #1e1e2e;
    --primary: #c0caf5;
    --secondary: #a9b1d6;
    --accent: #7aa2f7;
    --accent-rgb: 122, 162, 247;
    --green: #9ece6a;
    --red: #f7768e;
    --yellow: #e0af68;
    --comment: #565f89;
    --shadow: rgba(0,0,0,0.3);
    --font-main: 'Inter', sans-serif;
    --font-code: 'Fira Code', monospace;

    /* Syntax Highlighting */
    --syntax-keyword: #bb9af7;
    --syntax-string: #9ece6a;
    --syntax-number: #ff9e64;
    --syntax-comment: #565f89;
    --syntax-function: #7aa2f7;
    --syntax-class: #c0caf5;
}

body.light-mode {
    --background: #f8f9fa;
    --bg-rgb: 248, 249, 250;
    --surface-1: #ffffff;
    --surface-2: #f1f3f5;
    --primary: #212529;
    --secondary: #495057;
    --accent: #007bff;
    --accent-rgb: 0, 123, 255;
    --green: #28a745;
    --red: #dc3545;
    --yellow: #ffc107;
    --comment: #6c757d;
    --shadow: rgba(0,0,0,0.1);

    /* Syntax Highlighting */
    --syntax-keyword: #d73a49;
    --syntax-string: #032f62;
    --syntax-number: #005cc5;
    --syntax-comment: #6a737d;
    --syntax-function: #6f42c1;
    --syntax-class: #e36209;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-code); /* Monospace font */
    background-color: var(--background);
    color: var(--primary);
    line-height: 1.6;
    transition: background-color 0.4s, color 0.4s;
}

body.no-scroll {
    overflow: hidden;
}

a {
    color: var(--accent); /* Glowing text */
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--green);
}

header {
    position: sticky;
    top: 0;
    padding: 1rem 2rem;
    background-color: rgba(var(--bg-rgb), 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--comment);
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-code);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.hamburger {
    display: none; /* Hidden by default on desktop */
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001; /* Above nav links */
}

.hamburger-line {
    display: block;
    width: 25px;
    height: 2px;
    margin: 6px auto;
    background-color: var(--primary);
    transition: all 0.3s ease-in-out;
}

nav.nav-open .hamburger-line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}
nav.nav-open .hamburger-line:nth-child(2) {
    opacity: 0;
}
nav.nav-open .hamburger-line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

.logo::before {
    content: '$ ';
    color: var(--green);
}

nav ul {
    list-style: none;
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links {
    display: flex;
}

nav a {
    color: var(--primary);
    font-weight: 500;
    padding: 0.25rem 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.3s ease;
}

nav .nav-btn {
    background: none;
    border: none;
    color: var(--primary);
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: 500;
    padding: 0.25rem 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.3s ease, color 0.3s ease;
    cursor: pointer;
}

nav a:hover, nav a.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

nav .nav-btn:hover:not(:disabled) {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

/* Special button style for icons */
.btn.btn-icon {
    padding: 0.5rem;
    line-height: 0; /* Ensures button height collapses to padding + icon size */
}

/* Mute Toggle Button */
nav .mute-toggle-btn:hover {
    border-bottom-color: transparent !important; /* Override nav-btn hover in header */
}

.mute-toggle-btn svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    transition: stroke 0.3s ease;
    vertical-align: middle; /* Better alignment */
}

.mute-toggle-btn:hover svg {
    stroke: var(--accent);
}

.mute-toggle-btn .speaker-icon-off {
    display: none;
}

.mute-toggle-btn.muted .speaker-icon-on {
    display: none;
}

.mute-toggle-btn.muted .speaker-icon-off {
    display: block;
}

/* Theme Switcher Toggle */
.theme-switch {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.theme-switch input {
    display: none;
}

.slider {
    background-color: var(--surface-1);
    border: 1px solid var(--comment);
    border-radius: 34px;
    width: 50px;
    height: 26px;
    position: relative;
    transition: background-color 0.4s;
}

.slider::before {
    content: '';
    position: absolute;
    height: 20px;
    width: 20px;
    left: 2px;
    bottom: 2px;
    background-color: var(--yellow);
    border-radius: 50%;
    transition: transform 0.4s;
    /* Moon icon */
    box-shadow: inset 7px -6px 0px 0px var(--surface-1);
}

.theme-switch input:checked + .slider {
    background-color: var(--accent);
}

.theme-switch input:checked + .slider::before {
    transform: translateX(24px);
    /* Sun icon */
    background-color: var(--yellow);
    box-shadow: none;
}

main {
    padding: 2rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
    border-radius: 4px;
    font-family: var(--font-code);
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.btn:hover {
    background-color: var(--accent);
    color: var(--background);
}

/* Override hover for icon buttons in terminal nav to be more subtle */
.section-navigation .mute-toggle-btn.btn:hover {
    background-color: rgba(var(--accent-rgb), 0.15);
    color: var(--accent);
}

.nav-btn:disabled {
    color: var(--comment);
    cursor: not-allowed;
    opacity: 0.6;
}

/* Hero Section */
#hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;    
}

main > section {
    display: none; /* Hide all sections by default */
    padding: 2rem;
    border: 1px solid var(--comment);
    border-radius: 8px;
    margin-top: 1rem;
}

.terminal-window {
    width: 100%;
    max-width: 800px;
    background-color: var(--surface-1);
    border-radius: 8px;
    box-shadow: 0 10px 30px var(--shadow);
    overflow: hidden;
    margin: 0 auto;
}

.terminal-header {
    background-color: var(--surface-2);
    padding: 0.5rem 1rem;
    display: flex;
    align-items: center;
}

.terminal-buttons {
    display: flex;
    gap: 0.5rem;
}

.terminal-buttons span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}
.terminal-buttons .red { background-color: #f7768e; }
.terminal-buttons .yellow { background-color: #e0af68; }
.terminal-buttons .green { background-color: #9ece6a; }

.terminal-title {
    color: var(--secondary);
    margin: 0 auto;
    font-family: var(--font-code);
}

.terminal-body {
    padding: 1rem 2rem;
    font-family: var(--font-code);
    font-size: 1.1rem;
    text-align: left;
}

.terminal-body h1 {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.terminal-body .prompt {
    color: var(--green);
}

.terminal-body .path {
    color: var(--accent);
}

#typewriter-container {
    display: inline;
}

#typewriter {
    color: var(--primary);
}

.cursor {
    display: inline-block;
    width: 10px;
    height: 1.2rem;
    background-color: var(--accent); /* Glowing cursor */
    animation: blink 1s steps(1) infinite;
}

@keyframes blink {
    50% {
        opacity: 0;
    }
}

.hero-buttons {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.terminal-output-section {
    padding: 2rem 0;
    border-top: 1px dashed var(--comment);
    margin-top: 1rem; 
    text-align: left;
}

.loading-text {
    display: flex;
    align-items: center;
    padding: 1rem 0;
    color: var(--comment);
    font-style: italic;
}

.loader {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid var(--comment);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 0.5rem;
    vertical-align: middle;
}

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

.terminal-footer {
    padding: 1rem 2rem;
    border-top: 1px solid var(--comment);
    background-color: var(--surface-2);
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
}

/* About Page */
#about {
    max-width: 800px;
    margin: 0 auto;
}

#about h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--accent);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2rem;
    align-items: center;
}

.profile-pic-container {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid var(--accent);
}

.profile-pic-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.bio h3 {
    color: var(--green);
    font-family: var(--font-code);
}

/* Skills Page */
#skills h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--accent);
}

.skills-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    max-width: 900px;
    margin: 0 auto;
}

.skill-category {
    width: 100%;
    margin-bottom: 1rem;
}

.skill-category h3 {
    color: var(--green);
    font-family: var(--font-code);
    margin-bottom: 0.5rem;
    border-bottom: 1px solid var(--comment);
    padding-bottom: 0.5rem;
}

.skill-card {
    background-color: var(--surface-1);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-family: var(--font-code);
    font-size: 1rem;
    color: var(--primary);
    position: relative;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-left: 3px solid var(--accent);
}

.skill-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px var(--shadow);
}

.tooltip {
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--surface-2);
    color: var(--primary);
    padding: 0.5rem;
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    font-family: var(--font-main);
    font-size: 0.9rem;
    z-index: 10;
}

.skill-card:hover .tooltip {
    opacity: 1;
    visibility: visible;
}

/* Projects Page */
#projects h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--accent);
}

.projects-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.project-card {
    background-color: var(--surface-1);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px var(--shadow);
}

.project-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.project-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.project-content h3 {
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.tech-badges {
    margin-bottom: 1rem;
}

.tech-badges span {
    background-color: var(--comment);
    color: var(--primary);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-family: var(--font-code);
    margin-right: 0.5rem;
}

.project-links {
    margin-top: auto;
}

/* Experience Page */
#experience h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--accent);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    font-family: var(--font-code);
}

.timeline::before {
    content: '';
    position: absolute;
    width: 2px;
    background-color: var(--comment);
    top: 0;
    bottom: 0;
    left: 20px;
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
    padding-left: 50px;
}

.timeline-dot {
    position: absolute;
    left: 13px;
    top: 5px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--accent);
    border: 2px solid var(--background);
}

.timeline-date {
    color: var(--secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.timeline-content h3 {
    color: var(--green);
    font-size: 1.2rem;
}

.timeline-content p {
    color: var(--secondary);
    margin-bottom: 0.5rem;
}

.timeline-content ul {
    list-style-type: '» ';
    padding-left: 1.5rem;
}

/* Achievements Page */
#achievements h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--accent);
}

.achievements-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.achievement-card {
    background-color: var(--surface-1);
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    border-top: 3px solid var(--yellow);
}

.achievement-card h3 {
    color: var(--yellow);
    margin-bottom: 1rem;
    font-family: var(--font-code);
}

.counter {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary);
    font-family: var(--font-code);
}

/* Contact Page */
#contact h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--accent);
}

.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    max-width: 900px;
    margin: 0 auto;
    background-color: var(--surface-1);
    padding: 2rem;
    border-radius: 8px;
}

.contact-info h3 {
    color: var(--green);
    font-family: var(--font-code);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 0.8rem;
    margin-bottom: 1rem;
    border-radius: 4px;
    border: 1px solid var(--comment);
    background-color: var(--background);
    color: var(--primary);
    font-family: var(--font-main);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.contact-form .btn {
    width: 100%;
}

footer {
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
    border-top: 1px solid var(--comment);
    color: var(--secondary);
    font-size: 0.9rem;
}

.social-links a {
    margin: 0 0.5rem;
    color: var(--secondary);
    font-size: 1.5rem;
}

.social-links a:hover {
    color: var(--accent);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1001;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(var(--bg-rgb), 0.9);
}

.modal-content {
    background-color: var(--surface-1);
    margin: 5% auto;
    padding: 2rem;
    border-radius: 8px;
    max-width: 800px;
    position: relative;
    border-top: 3px solid var(--accent);
}

.modal-content h2 {
    color: var(--accent);
    margin-bottom: 1rem;
}

.modal-content h4 {
    color: var(--green);
    font-family: var(--font-code);
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.close-btn {
    color: var(--secondary);
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
}

.close-btn:hover {
    color: var(--primary);
}

pre {
    background-color: var(--background);
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
    font-family: var(--font-code);
}

code {
    font-family: var(--font-code);
}

/* Syntax Highlighting Simulation */
.code-keyword { color: var(--syntax-keyword); }
.code-string { color: var(--syntax-string); }
.code-number { color: var(--syntax-number); }
.code-comment { color: var(--syntax-comment); }
.code-function { color: var(--syntax-function); }
.code-class { color: var(--syntax-class); }

/* --- Responsive Design --- */

@media (max-width: 1024px) {
    header {
        padding: 1rem;
    }

    .hamburger {
        display: block;
    }

    .nav-links {
        display: block;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: rgba(var(--bg-rgb), 0.95);
        backdrop-filter: blur(10px);
        border-bottom: 1px solid var(--comment);
        transform: translateY(-150%);
        transition: transform 0.3s ease-in-out;
        z-index: 999;
        max-height: calc(100vh - 60px); /* Prevent menu from being too long */
        overflow-y: auto;
    }

    nav.nav-open .nav-links {
        transform: translateY(0);
    }

    nav ul {
        flex-direction: column;
        align-items: center;
        padding: 1rem 0;
        gap: 1rem;
    }

    /* For index.html nav buttons */
    .nav-buttons {
        width: 100%;
    }
    .nav-buttons li {
        width: 100%;
        text-align: center;
        display: flex;
        justify-content: center;
    }
    .nav-buttons .nav-btn {
        width: 80%;
        padding: 0.75rem;
        border-bottom: none;
    }
    nav .nav-btn:hover:not(:disabled) {
        border-bottom-color: transparent;
        background-color: rgba(var(--accent-rgb), 0.1);
    }
    .nav-buttons .theme-switch {
        padding: 0.5rem 0;
    }

    /* For other pages nav links */
    nav ul a {
        padding: 0.75rem;
        display: block;
        width: 100%;
        text-align: center;
    }
    nav ul a:hover, nav ul a.active {
        background-color: rgba(var(--accent-rgb), 0.1);
        border-bottom-color: transparent;
    }
}

@media (max-width: 768px) {
    body {
        font-size: 15px; /* Slightly larger for readability on mobile */
    }

    main {
        padding: 1.5rem 1rem;
    }

    .terminal-window {
        border-radius: 0;
        margin: 0 -1rem; /* Make it edge-to-edge */
        width: auto;
    }

    .terminal-body {
        padding: 1rem;
        font-size: 1rem;
    }

    .terminal-body h1 {
        font-size: 2rem;
    }

    .terminal-footer {
        padding: 1rem;
        gap: 0.5rem;
    }
    .terminal-footer .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        text-align: center;
    }

    .profile-pic-container {
        width: 150px;
        height: 150px;
        margin: 0 auto;
    }

    .bio {
        text-align: left;
    }

    .projects-container,
    .contact-container {
        grid-template-columns: 1fr;
    }

    .contact-container {
        gap: 2rem;
        padding: 1.5rem;
    }

    .timeline::before { left: 10px; }
    .timeline-item { padding-left: 35px; }
    .timeline-dot { left: 3px; width: 14px; height: 14px; }

    .modal-content {
        width: 95%;
        margin: 10% auto;
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.2rem;
    }

    #about h2, #skills h2, #projects h2, #experience h2, #achievements h2, #contact h2 {
        font-size: 2rem;
    }

    .achievement-card { padding: 1.5rem; }
    .counter { font-size: 2.5rem; }
    .contact-form input, .contact-form textarea { padding: 0.7rem; }
}