:root {
    --bg:           #050505;
    --neon-blue:    #00f2fe;
    --neon-purple:  #9b59ff;
    --text-main:    #ffffff;
    --text-muted:   #a0a0a0;
    --glass-bg:     rgba(20, 20, 20, 0.45);
    --glass-border: rgba(255, 255, 255, 0.08);
    --form-bg:      rgba(0, 0, 0, 0.30);
    --chat-header:  rgba(0, 0, 0, 0.50);
    --chat-foot:    rgba(0, 0, 0, 0.30);
    --btn-text:     #000000;
}

/* ─── LIGHT MODE OVERRIDES ──────────────────────────── */
[data-theme="light"] {
    --bg:           #eef2ff;
    --neon-blue:    #0057e7;
    --neon-purple:  #7c3aed;
    --text-main:    #0f172a;
    --text-muted:   #475569;
    --glass-bg:     rgba(255, 255, 255, 0.65);
    --glass-border: rgba(0, 87, 231, 0.20);
    --form-bg:      rgba(255, 255, 255, 0.55);
    --chat-header:  rgba(230, 235, 255, 0.85);
    --chat-foot:    rgba(230, 235, 255, 0.75);
    --btn-text:     #ffffff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg);
    color: var(--text-main);
    overflow-x: hidden;
    position: relative;
    transition: background-color 0.4s ease, color 0.3s ease;
}

/* Loading Screen */
#loading {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100vh;
    background: #000;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 1s ease, visibility 1s;
}

.loader {
    position: relative;
    width: 150px; height: 150px;
    display: flex; justify-content: center; align-items: center;
}

.ring {
    position: absolute; width: 100%; height: 100%;
    border-radius: 50%;
    animation: animateRing 2s linear infinite;
}

.ring:nth-child(1) {
    border-bottom: 4px solid var(--neon-blue);
    animation-delay: -1.5s;
}
.ring:nth-child(2) {
    border-right: 4px solid var(--neon-purple);
    animation-delay: -1s;
}
.ring:nth-child(3) {
    border-top: 4px solid #fff;
    animation-delay: -0.5s;
}

@keyframes animateRing {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loader span {
    font-weight: 600; letter-spacing: 2px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* 3D Canvas Background */
#bg-canvas {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100vh;
    z-index: -1;
    pointer-events: none;
}

/* Main Content */
main {
    position: relative;
    z-index: 10;
    /* Hide until loading is done */
    opacity: 0;
}

/* Section styling */
section {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 100px 20px;
}

.section-title {
    margin-bottom: 50px;
    text-align: center;
}

.section-title h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 3rem;
    font-weight: 700;
}

.neon-text {
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 20px rgba(0, 242, 254, 0.4);
}

/* Glassmorphism utility */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
    transition: transform 0.4s ease, border-color 0.4s ease;
}

.glass-panel:hover {
    border-color: rgba(255, 255, 255, 0.2);
}

/* Buttons */
.btn {
    padding: 12px 28px;
    border-radius: 30px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
    cursor: pointer;
    font-family: 'Space Grotesk', sans-serif;
}

.primary-btn {
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple));
    color: var(--btn-text);
    box-shadow: 0 0 20px rgba(79, 172, 254, 0.4);
}

.primary-btn:hover {
    box-shadow: 0 0 40px rgba(79, 172, 254, 0.6);
    transform: translateY(-3px);
}

.secondary-btn {
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--glass-border);
}

.secondary-btn:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-3px);
}

/* Hero Section */
.hero-card {
    text-align: center;
    max-width: 500px;
    width: 100%;
}

.profile-img-wrapper {
    position: relative;
    width: 160px; height: 160px;
    margin: 0 auto 20px;
}

.profile-img {
    width: 100%; height: 100%;
    border-radius: 50%;
    object-fit: cover;
    z-index: 2;
    position: relative;
}

.glow-ring {
    position: absolute;
    top: -5px; left: -5px; right: -5px; bottom: -5px;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--neon-blue), var(--neon-purple), transparent);
    z-index: 1;
    animation: rotateGlow 4s linear infinite;
    filter: blur(10px);
}

@keyframes rotateGlow {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.hero-card .name {
    font-size: 3.5rem;
    font-family: 'Space Grotesk', sans-serif;
    margin-bottom: 5px;
}

.hero-card .subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 30px;
}

.btn-group {
    display: flex; gap: 15px; justify-content: center; flex-wrap: wrap;
}

/* About Section */
.about-content {
    max-width: 800px;
    font-size: 1.2rem;
    line-height: 1.8;
    text-align: center;
    color: #ddd;
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    max-width: 1000px;
    width: 100%;
}

.skill-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px;
    cursor: pointer;
    transform-style: preserve-3d;
}

.skill-card i {
    font-size: 4rem;
    margin-bottom: 15px;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: transform 0.3s ease;
}

.skill-card:hover i {
    transform: translateZ(30px) scale(1.1);
}

.skill-card h3 {
    font-size: 1.2rem;
    transform: translateZ(20px);
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    max-width: 1100px;
    width: 100%;
}

.project-card {
    padding: 30px;
}

.project-card h3 {
    font-size: 1.8rem;
    margin-bottom: 10px;
}

.project-card p {
    color: var(--text-muted);
    margin-bottom: 25px;
}

.project-card .links {
    display: flex; gap: 15px;
}

.project-link {
    color: var(--neon-blue);
    text-decoration: none;
    display: flex; align-items: center; gap: 5px;
    font-weight: 600;
}

.project-link:hover {
    color: var(--neon-purple);
    text-shadow: 0 0 10px var(--neon-purple);
}

/* Achievements Timeline */
.timeline {
    max-width: 800px;
    width: 100%;
    position: relative;
    border-left: 2px solid var(--glass-border);
    padding-left: 30px;
    margin-left: 20px;
}

.timeline-item {
    position: relative;
    margin-bottom: 40px;
    padding: 25px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -40px; top: 30px;
    width: 16px; height: 16px;
    background: var(--neon-purple);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--neon-purple);
}

.timeline-item h4 {
    font-size: 1.4rem; margin-bottom: 10px;
}

.timeline-item p {
    color: var(--text-muted);
}

/* Contact */
.contact-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 40px;
    width: 100%; max-width: 600px;
}

.socials {
    display: flex; gap: 25px;
}

.social-icon {
    font-size: 2.5rem;
    color: rgba(255,255,255,0.7);
    transition: all 0.3s ease;
    display: inline-block;
}

.social-icon:hover {
    color: var(--neon-blue);
    transform: scale(1.2) rotate(10deg);
    text-shadow: 0 0 15px var(--neon-blue);
}

.contact-form {
    display: flex; flex-direction: column; gap: 20px; width: 100%;
}

.contact-form input, .contact-form textarea {
    background: var(--form-bg);
    border: 1px solid var(--glass-border);
    padding: 15px 20px;
    border-radius: 12px;
    color: var(--text-main);
    outline: none;
    font-size: 1rem;
    transition: border-color 0.3s ease, background 0.4s ease;
}

.contact-form input:focus, .contact-form textarea:focus {
    border-color: var(--neon-blue);
}

.send-btn {
    border: none; font-size: 1.1rem;
    display: flex; justify-content: center; align-items: center; gap: 10px;
}

.email-text {
    text-align: center; margin-top: 10px; color: var(--text-muted);
}

/* AI Chatbot */
#chatbot-container {
    position: fixed;
    bottom: 90px; right: 30px;
    width: 320px; height: 450px;
    display: flex; flex-direction: column;
    padding: 0;
    z-index: 100;
    overflow: hidden;
    transform-origin: bottom right;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

#chatbot-container.hidden {
    transform: scale(0);
    opacity: 0;
    pointer-events: none;
}

.chat-header {
    padding: 15px 20px;
    background: var(--chat-header);
    border-bottom: 1px solid var(--glass-border);
    display: flex; justify-content: space-between; align-items: center;
    transition: background 0.4s ease;
}

.chat-header h3 { font-size: 1.1rem; font-family: 'Space Grotesk', sans-serif;}

.chat-header button {
    background: none; border: none; color: #fff; font-size: 1.5rem; cursor: pointer;
}

.chat-body {
    flex: 1; padding: 20px; overflow-y: auto;
    display: flex; flex-direction: column; gap: 15px;
}

.chat-body::-webkit-scrollbar { width: 6px; }
.chat-body::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); border-radius: 3px; }

.message {
    max-width: 85%; padding: 10px 15px; border-radius: 15px; font-size: 0.95rem; line-height: 1.4;
}

.message.bot {
    background: rgba(79, 172, 254, 0.15);
    border: 1px solid rgba(79, 172, 254, 0.3);
    align-self: flex-start;
    border-bottom-left-radius: 5px;
}

.message.user {
    background: rgba(255, 255, 255, 0.1);
    align-self: flex-end;
    border-bottom-right-radius: 5px;
}

.chat-footer {
    padding: 15px;
    border-top: 1px solid var(--glass-border);
    display: flex; gap: 10px;
    background: var(--chat-foot);
    transition: background 0.4s ease;
}

.chat-footer input {
    flex: 1; background: rgba(255,255,255,0.05); border: 1px solid var(--glass-border);
    padding: 10px 15px; border-radius: 20px; color: #fff; outline: none;
}

.chat-footer input:focus { border-color: var(--neon-purple); }

.chat-footer button {
    background: linear-gradient(45deg, var(--neon-blue), var(--neon-purple));
    border: none; width: 40px; height: 40px; border-radius: 50%;
    display: flex; justify-content: center; align-items: center;
    color: #000; font-size: 1.2rem; cursor: pointer;
}

#chatbot-toggle {
    position: fixed; bottom: 30px; right: 30px;
    background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
    border: none; padding: 15px 25px; border-radius: 30px;
    font-weight: 600; font-family: 'Space Grotesk', sans-serif; font-size: 1rem;
    color: #000; cursor: pointer; z-index: 99;
    box-shadow: 0 0 20px rgba(0, 242, 254, 0.4);
    display: flex; align-items: center; gap: 10px;
    transition: all 0.3s ease;
}

#chatbot-toggle:hover {
    transform: translateY(-5px);
    box-shadow: 0 0 30px rgba(0, 242, 254, 0.6);
}

/* ─── THEME TOGGLE BUTTON ──────────────────────────── */
#theme-toggle {
    position: fixed;
    top: 20px; right: 20px;
    z-index: 200;
    width: 46px; height: 46px;
    border-radius: 50%;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--neon-blue);
    font-size: 1.3rem;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 0 15px rgba(0, 87, 231, 0.25);
}
#theme-toggle:hover {
    transform: scale(1.12) rotate(20deg);
    box-shadow: 0 0 25px rgba(0, 87, 231, 0.5);
    border-color: var(--neon-blue);
}

/* Responsive */
@media(max-width: 768px) {
    .hero-card .name { font-size: 2.5rem; }
    .section-title h2 { font-size: 2.2rem; }
    #chatbot-toggle { bottom: 20px; right: 20px; padding: 12px 20px; }
    #chatbot-container { bottom: 80px; right: 20px; width: calc(100% - 40px); height: 400px; }
    #drone-container { transform: translate(-50%, -50%) scale(0.75); }
    #theme-toggle { top: 12px; right: 12px; width: 40px; height: 40px; }
}

/* ─── DRONE ──────────────────────────────────────────────── */

/* Full-viewport fixed overlay (pointer-events none so clicks pass through) */
#drone-wrapper {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    z-index: 50;
}

/* The moving container — GSAP animates its left/top */
#drone-container {
    position: absolute;
    top: 15%;
    left: 78%;
    transform: translate(-50%, -50%);
    filter: drop-shadow(0 0 10px rgba(0, 242, 254, 0.6));
    transition: filter 0.4s ease;
}

/* SVG drone base */
#drone-svg {
    display: block;
    transform-origin: center center;
    /* hover bob handled by JS */
}

/* Rotor spin — transform-box: fill-box makes transform-origin: center work in SVG */
.rotor {
    transform-box: fill-box;
    transform-origin: center;
    animation: spinRotor 0.22s linear infinite;
}
/* Opposite rotors spin the other way for realism */
.r2, .r3 {
    animation-direction: reverse;
    animation-duration: 0.28s;
}

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

/* Spotlight cone pointing downward from drone center */
#drone-spotlight {
    position: absolute;
    left: 50%;
    top: 72%;
    transform: translateX(-50%);
    width: 0; height: 0;
    border-left:  22px solid transparent;
    border-right: 22px solid transparent;
    border-top:   65px solid rgba(0, 242, 254, 0.07);
    filter: blur(14px);
    animation: pulseSpotlight 2s ease-in-out infinite;
}

@keyframes pulseSpotlight {
    0%, 100% { opacity: 0.6; }
    50%       { opacity: 1.0; }
}

/* Section label pill that hovers below the drone */
#drone-label {
    position: absolute;
    top: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 242, 254, 0.12);
    border: 1px solid rgba(0, 242, 254, 0.4);
    color: #00f2fe;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    padding: 4px 12px;
    border-radius: 20px;
    white-space: nowrap;
    backdrop-filter: blur(6px);
    animation: labelPulse 2s ease-in-out infinite;
}

@keyframes labelPulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(0, 242, 254, 0.3); }
    50%       { box-shadow: 0 0 12px 4px rgba(0, 242, 254, 0.15); }
}