/* Color Palette & Themes (Dark Mode Only) */
:root {
    /* Primary brand colors */
    --primary-color: #5690fa; /* Lighter, slightly desaturated blue for main accents */
    --secondary-color: #b0b8bf; /* Muted light gray for less emphasis */
    --accent-color: #63d471; /* Lighter green for success/highlight */

    /* Text Colors */
    --text-color: #e2e6ea; /* Light text for main content */
    --white: #ffffff; /* Pure white for elements on dark backgrounds like hero */

    /* Background Colors - More colorful dark tones */
    --main-bg: #20232b; /* Very dark blue-grey for body/main background */
    --section-bg-odd: rgba(40, 44, 52, 0.88); /* Slightly darker blue-grey, slightly less transparent */
    --section-bg-even: rgba(58, 64, 75, 0.88); /* Deeper blue-grey, slightly less transparent */
    --card-bg: #39404E; /* Deeper blue-grey for cards, distinct from sections */
    --header-footer-bg: #1A1E26; /* Almost black-blue for header/footer */


    /* Shadows and Glows (adjusted for NO glow) */
    --button-hover-shadow: rgba(255,255,255,0.08); /* Reduced opacity for hover shadow */
    --box-shadow-light: rgba(0,0,0,0.25); /* Lighter box shadow */
    --box-shadow-dark: rgba(0,0,0,0.4); /* Darker box shadow */

    /* Fonts */
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Open Sans', sans-serif;

    /* Transition for smooth changes (e.g., hover effects) */
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* General Body & Reset */
body {
    margin: 0;
    font-family: var(--font-body);
    line-height: 1.6;
    color: var(--text-color);
    overflow-x: hidden; /* Prevent horizontal scroll from animations */
    background-color: var(--main-bg); /* Base background color for dark mode */

    /* Dynamic Background: Brighter Stardust */
    background-image:
        radial-gradient(circle at 10% 20%, rgba(255, 255, 255, 0.3) 1.2px, transparent 0),
        radial-gradient(circle at 70% 80%, rgba(255, 255, 255, 0.25) 1px, transparent 0),
        radial-gradient(circle at 40% 50%, rgba(255, 255, 255, 0.2) 0.8px, transparent 0);
    background-size: 100px 100px, 70px 70px, 50px 50px;
    animation: stardust 30s linear infinite alternate;
}

/* NO Glow effect for all text */
p, a, li, span, div:not(.burger div) {
    /* text-shadow removed */
}


/* NO Glow effect for headings */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--primary-color);
    margin-bottom: 0.8em;
    transition: color 0.3s ease, text-shadow 0.3s ease;
    /* text-shadow removed */
}

p {
    margin-bottom: 1em;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* Header & Navigation */
header {
    background-color: var(--header-footer-bg); /* Uses new header/footer variable */
    box-shadow: 0 2px 10px var(--box-shadow-light);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 20px;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-links {
    list-style: none;
    display: flex;
    margin: 0;
    padding: 0;
}

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    font-weight: 600;
    padding: 5px 0;
    position: relative;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 8px;
    transition: color 0.3s ease;
}

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

.nav-links a.active {
    color: var(--accent-color);
}

/* Burger menu for mobile */
.burger {
    display: none;
    cursor: pointer;
}

.burger div {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 5px;
    transition: all 0.3s ease;
}

/* Main Sections */
section {
    padding: 80px 20px;
    margin: 0 auto;
    max-width: 1200px;
    text-align: center;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* More Colorful: Slightly less transparent and distinct section backgrounds */
section:nth-of-type(odd) {
    background-color: var(--section-bg-odd); /* Using new variable */
}

section:nth-of-type(even) {
    background-color: var(--section-bg-even); /* Using new variable */
}


/* Hero Section */
#hero {
    background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('images/hero-bg.jpeg') no-repeat center center/cover;
    color: var(--white);
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background-color: initial;
}

#hero h1 {
    font-size: 3.5rem;
    margin-bottom: 0.5em;
    color: var(--white); /* Always white for hero text */
    /* text-shadow removed */
}

#hero p {
    font-size: 1.3rem;
    margin-bottom: 2em;
    opacity: 0.9;
    /* text-shadow removed */
}

/* Typewriter effect for Hero H1 */
.typewriter {
    overflow: hidden;
    white-space: nowrap;
    margin: 0 auto;
    letter-spacing: .05em;
    animation:
        typing 3.5s steps(40, end) forwards,
        blink-caret .75s step-end infinite;
    border-right: .15em solid orange;
}

/* The typing animation */
@keyframes typing {
    from { width: 0 }
    to { width: 100% }
}

/* The typewriter cursor effect */
@keyframes blink-caret {
    from, to { border-color: transparent }
    50% { border-color: orange; }
}


/* About Section */
#about {
    padding-top: 100px;
}

.about-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.profile-pic {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 30px;
    border: 5px solid var(--primary-color);
    box-shadow: 0 5px 15px var(--box-shadow-light);
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.profile-pic:hover {
    transform: scale(1.05);
}

/* Accordion Styles */
.accordion-item {
    width: 100%;
    max-width: 700px;
    margin: 20px auto;
    border: 1px solid var(--dark-bg); /* Keep a subtle border for structure */
    border-radius: 8px;
    overflow: hidden;
    transition: border-color 0.3s ease;
}

.accordion-header {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 15px 20px;
    width: 100%;
    text-align: left;
    border: none;
    outline: none;
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s ease;
    font-family: var(--font-heading);
    font-weight: 600;
    /* text-shadow removed */
}

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

.accordion-header::after {
    content: '\002B';
    font-weight: bold;
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}

.accordion-header.active::after {
    content: "\2212";
    transform: rotate(180deg);
}

.accordion-content {
    padding: 0 20px;
    background-color: var(--card-bg); /* Uses new card background variable */
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out, background-color 0.3s ease;
    text-align: left;
}

.accordion-content p {
    padding-top: 15px;
    padding-bottom: 15px;
    font-size: 0.95rem;
    color: var(--text-color);
}


/* Interests Section */
#interests {
    padding-top: 100px;
}

.interests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.interest-card {
    background-color: var(--card-bg); /* Uses new card background variable */
    border-radius: 10px;
    box-shadow: 0 5px 15px var(--box-shadow-light);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
    text-align: left;
    cursor: pointer;
}

.interest-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 20px var(--box-shadow-dark);
}

.interest-card img.interest-thumbnail {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
    border-bottom: 1px solid var(--section-bg-even); /* Subtle border for images */
}

.interest-card-content {
    padding: 20px;
}

.interest-card h3 {
    font-size: 1.5rem;
    margin-top: 0;
    color: var(--primary-color);
}

.interest-card p {
    font-size: 0.95rem;
    color: var(--secondary-color);
    margin-bottom: 0;
}


/* Contact Section */
#contact {
    padding-top: 100px;
}

.contact-links {
    margin-top: 30px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 25px;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    /* text-shadow removed */
}

.primary-btn {
    background-color: var(--primary-color);
    color: var(--white);
    border: 2px solid var(--primary-color);
}

.primary-btn:hover {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--button-hover-shadow);
}

.secondary-btn {
    background-color: var(--card-bg); /* Use card-bg for secondary button background */
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.secondary-btn:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--button-hover-shadow);
}

.social-btn {
    background-color: var(--secondary-color);
    color: var(--white);
    border: 2px solid var(--secondary-color);
}

.social-btn:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--button-hover-shadow);
}

/* Footer */
footer {
    background-color: var(--header-footer-bg); /* Uses new header/footer variable */
    color: var(--footer-text);
    padding: 30px 20px;
    text-align: center;
    font-size: 0.9rem;
    margin-top: 50px;
    transition: background-color 0.3s ease, color 0.3s ease;
    /* text-shadow removed */
}

/* Back to Top Button */
#backToTopBtn {
    display: none;
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 999;
    border: none;
    outline: none;
    background-color: var(--primary-color);
    color: var(--white);
    cursor: pointer;
    padding: 15px 20px;
    border-radius: 50%;
    font-size: 24px;
    line-height: 1;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease, color 0.3s ease;
    /* text-shadow removed */
}

#backToTopBtn:hover {
    background-color: var(--accent-color);
    transform: translateY(-3px);
    box-shadow: 0 6px 12px var(--box-shadow-dark);
}

/* Fade-in on Scroll Effect */
.fade-in-section {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in-section.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Lightbox Styles */
.lightbox {
    display: none;
    position: fixed;
    z-index: 2000;
    padding-top: 60px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.9);
    transition: opacity 0.3s ease;
    opacity: 0;
}

.lightbox.open {
    display: block;
    opacity: 1;
}

.lightbox-content {
    margin: auto;
    display: block;
    max-width: 80%;
    max-height: 80vh;
    object-fit: contain;
    border-radius: 8px;
    animation: zoomIn 0.3s;
}

.lightbox-caption {
    margin: 15px auto;
    display: block;
    width: 80%;
    max-width: 700px;
    text-align: center;
    color: #ccc;
    padding: 10px 0;
    font-size: 1.2rem;
    /* text-shadow removed */
}

/* Close button for lightbox */
.close-btn {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
    /* text-shadow removed */
}

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

/* Lightbox Animation */
@keyframes zoomIn {
    from {transform: scale(0.8); opacity: 0;}
    to {transform: scale(1); opacity: 1;}
}

/* Stardust Background Animation */
@keyframes stardust {
    0% {
        background-position: 0px 0px, 0px 0px, 0px 0px;
    }
    50% {
        background-position: 30px 25px, -20px 18px, 15px -10px;
    }
    100% {
        background-position: 0px 0px, 0px 0px, 0px 0px;
    }
}


/* --- Responsive Design Media Queries --- */

/* Base for larger desktops (already mostly covered) */
/* No specific changes here, as it's the default large-screen styling */

/* Tablet & Smaller Desktop Adjustments */
@media (max-width: 1024px) {
    #hero h1 {
        font-size: 3rem; /* Slightly smaller on tablets */
    }

    #hero p {
        font-size: 1.2rem;
    }

    .interests-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); /* Adjust grid for slightly smaller screens */
        gap: 20px;
    }
}

/* Mobile Adjustments (Max-width 768px and below) */
@media (max-width: 768px) {
    nav {
        padding: 1rem 15px; /* Smaller padding */
    }

    .nav-links {
        position: fixed;
        right: 0;
        top: 0;
        height: 100vh;
        width: 70%; /* Wider on smaller mobiles */
        background-color: var(--header-footer-bg);
        flex-direction: column;
        justify-content: center;
        transform: translateX(100%);
        transition: transform 0.5s ease-in-out, background-color 0.3s ease;
        z-index: 99;
        box-shadow: -5px 0 15px var(--box-shadow-light);
    }

    .nav-links.nav-active {
        transform: translateX(0%);
    }

    .nav-links li {
        opacity: 0;
        margin: 20px 0;
        text-align: center;
    }

    .nav-links a {
        font-size: 1.3rem; /* Larger font size for mobile links */
        color: var(--text-color);
    }

    .nav-links a.active {
        color: var(--primary-color);
    }

    .burger {
        display: block;
        z-index: 100;
    }

    /* Burger menu icon animation */
    .burger.toggle .line1 {
        transform: rotate(-45deg) translate(-5px, 6px);
    }

    .burger.toggle .line2 {
        opacity: 0;
    }

    .burger.toggle .line3 {
        transform: rotate(45deg) translate(-5px, -6px);
    }

    #hero h1 {
        font-size: 2.5rem; /* Smaller hero heading */
    }

    #hero p {
        font-size: 1rem; /* Smaller hero paragraph */
    }

    section {
        padding: 60px 15px; /* Reduced vertical and horizontal padding for sections */
    }

    h2 {
        font-size: 2rem; /* Smaller main headings */
    }

    .profile-pic {
        width: 150px;
        height: 150px;
    }

    .accordion-header {
        font-size: 1rem; /* Smaller accordion headers */
        padding: 12px 15px;
    }

    .accordion-content p {
        font-size: 0.9rem; /* Smaller accordion content text */
    }

    .interests-grid {
        grid-template-columns: 1fr; /* Stack cards on small screens */
        gap: 25px;
    }

    .interest-card img.interest-thumbnail {
        height: 180px; /* Slightly smaller image height */
    }

    .interest-card h3 {
        font-size: 1.3rem; /* Smaller interest card titles */
    }

    .btn {
        padding: 10px 20px; /* Slightly smaller buttons */
        font-size: 0.95rem;
    }

    .contact-links {
        flex-direction: column; /* Stack contact buttons vertically */
        gap: 10px;
    }

    footer {
        padding: 20px 15px; /* Smaller footer padding */
        font-size: 0.8rem;
    }

    #backToTopBtn {
        bottom: 20px;
        right: 20px;
        padding: 12px 16px;
        font-size: 20px;
    }

    .lightbox-content {
        max-width: 90%; /* Wider lightbox content on small screens */
        max-height: 70vh;
    }

    .lightbox-caption {
        font-size: 1rem; /* Smaller lightbox caption */
    }

    .close-btn {
        font-size: 35px; /* Smaller close button */
        top: 10px;
        right: 20px;
    }
}

/* Extra Small Mobile Devices */
@media (max-width: 480px) {
    .nav-links {
        width: 85%; /* Even wider to fill more space */
    }

    .logo {
        font-size: 1.5rem; /* Smaller logo */
    }

    #hero h1 {
        font-size: 2rem; /* Even smaller hero heading */
    }

    #hero p {
        font-size: 0.9rem;
    }

    h2 {
        font-size: 1.8rem;
    }

    .btn {
        padding: 8px 18px;
        font-size: 0.9rem;
    }

    section {
        padding: 40px 10px; /* Reduced padding on very small screens */
    }
}


/* Staggered Nav Link Fade Animation (for mobile menu) */
@keyframes navLinkFade {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0px);
    }
}