*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    text-decoration: none;
    border: none;
    outline: none;
    scroll-behavior: smooth;
}

:root,
[data-theme="light"] {
    --bg-color: #ffffff;
    --second-bg-color: #f0f2f5;
    --text-color: #222;
    --text-secondary: #555;
    --text-muted: #777;
    --main-color: #0aa;
    --border-color: rgba(0, 0, 0, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.1);
    --overlay-color: rgba(0, 0, 0, 0.5);
}

[data-theme="dark"] {
    --bg-color: #1f242d;
    --second-bg-color: #323946;
    --text-color: #fff;
    --text-secondary: #ccc;
    --text-muted: #aaa;
    --main-color: #0ef;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.2);
    --overlay-color: rgba(0, 0, 0, 0.6);
}

html {
    font-size: 62.5%;
    overflow-x: hidden;
}

body {
    background: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

section {
    min-height: 100vh;
    padding: 10rem 9% 2rem;
    position: relative;
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.section-hidden {
    opacity: 0;
    transform: translateY(4rem);
}

.section-enter {
    opacity: 1;
    transform: translateY(0);
}

section::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 9%;
    right: 9%;
    height: 0.1rem;
    background: linear-gradient(90deg, transparent, var(--main-color), transparent);
    opacity: 0.15;
}

section:last-of-type::after {
    display: none;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 2rem 9%;
    background: var(--bg-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    border-bottom: 0.1rem solid var(--border-color);
    animation: headerSlideDown 0.8s ease forwards;
    transition: padding 0.4s ease, box-shadow 0.4s ease, background 0.4s ease;
}

.header.scrolled {
    padding: 1.2rem 9%;
    box-shadow: 0 0.5rem 2rem var(--shadow-color);
    backdrop-filter: blur(1rem);
    -webkit-backdrop-filter: blur(1rem);
    border-bottom-color: transparent;
}

@keyframes headerSlideDown {
    0% {
        transform: translateY(-100%);
        opacity: 0;
    }
    60% {
        transform: translateY(0.5rem);
        opacity: 1;
    }
    100% {
        transform: translateY(0);
        opacity: 1;
    }
}

.logo {
    font-size: 2.5rem;
    color: var(--text-color);
    font-weight: 600;
    cursor: default;
    animation: logoFadeIn 0.8s ease 0.3s both;
}

@keyframes logoFadeIn {
    0% {
        opacity: 0;
        transform: translateX(-2rem);
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

.header-right {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.navbar a {
    font-size: 1.6rem;
    color: var(--text-color);
    margin-left: 4rem;
    position: relative;
    transition: 0.3s;
}

.navbar a::after {
    content: '';
    position: absolute;
    bottom: -0.4rem;
    left: 0;
    width: 0;
    height: 0.2rem;
    background: var(--main-color);
    border-radius: 0.1rem;
    transition: width 0.3s ease;
}

.navbar a:hover::after,
.navbar a.active::after {
    width: 100%;
}

.navbar a:hover,
.navbar a.active {
    color: var(--main-color);
}

.navbar a.active {
    animation: activeLinkGlow 0.6s ease;
}

@keyframes activeLinkGlow {
    0% {
        text-shadow: 0 0 0 transparent;
        transform: scale(1);
    }
    50% {
        text-shadow: 0 0 1.5rem var(--main-color);
        transform: scale(1.1);
    }
    100% {
        text-shadow: 0 0 0 transparent;
        transform: scale(1);
    }
}

#menu-icon {
    font-size: 3.6rem;
    color: var(--text-color);
    display: none;
}

.home {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 4rem;
}

.home-content h3 {
    font-size: 3.2rem;
    font-weight: 700;
}

.home-content h3 span {
    color: var(--main-color);
}

.home-content h3:nth-of-type(2) {
    margin-bottom: 2rem;
}

.home-content h1 {
    font-size: 5rem;
    font-weight: 700;
    line-height: 1.3;
}

.home-content p {
    font-size: 1.6rem;
    line-height: 1.6;
    color: var(--text-secondary);
    max-width: 50rem;
}

.home-img img {
    width: 32vw;
    animation: floatImage 4s ease-in-out infinite;
    filter: drop-shadow(0 0 2rem var(--main-color));
}

@keyframes floatImage {
    0% { transform: translateY(0); }
    50% { transform: translateY(-2.4rem); }
    100% { transform: translateY(0); }
}

.social-media a {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 4rem;
    height: 4rem;
    background: transparent;
    border: 0.2rem solid var(--main-color);
    border-radius: 50%;
    font-size: 2rem;
    color: var(--main-color);
    margin: 3rem 1.5rem 3rem 0;
    transition: 0.5s ease;
}

.social-media a:hover {
    background: var(--main-color);
    color: var(--second-bg-color);
    box-shadow: 0 0 1rem var(--main-color);
}

.btn {
    display: inline-block;
    padding: 1.2rem 2.8rem;
    background: var(--main-color);
    border-radius: 4rem;
    font-size: 1.6rem;
    color: var(--second-bg-color);
    letter-spacing: 0.1rem;
    font-weight: 600;
    transition: 0.5s ease;
    cursor: pointer;
}

.btn:hover {
    box-shadow: 0 0 1rem var(--main-color);
}

.about {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 4rem;
    background: var(--second-bg-color);
}

.about-img img {
    width: 32vw;
    filter: drop-shadow(0 0 1rem var(--main-color));
}

.heading {
    text-align: center;
    font-size: 4.5rem;
    margin-bottom: 4rem;
}

.heading span {
    color: var(--main-color);
}

.about-content {
    max-width: 60rem;
}

.about-content h2 {
    text-align: left;
    line-height: 1.2;
}

.about-content h3 {
    font-size: 2.4rem;
    color: var(--main-color);
    margin-bottom: 1.5rem;
}

.about-content span {
    color: var(--main-color);
    font-weight: 600;
}

.about-content p {
    font-size: 1.6rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

.skills h2 {
    margin-bottom: 5rem;
}

.skills-container {
    display: flex;
    justify-content: center;
    align-items: stretch;
    flex-wrap: wrap;
    gap: 3rem;
}

.skills-container .skills-box {
    flex: 1 1 30rem;
    background: var(--second-bg-color);
    padding: 3rem 2rem 4rem;
    border-radius: 2rem;
    text-align: center;
    border: 0.2rem solid var(--bg-color);
    transition: 0.5s ease;
}

.skills-container .skills-box:hover {
    border-color: var(--main-color);
    transform: scale(1.02);
}

.skills-box i {
    font-size: 6rem;
    color: var(--main-color);
    margin-bottom: 1.5rem;
}

.skills-box h3 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
}

.skills-box p {
    font-size: 1.5rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

/* Experience */
.experience {
    padding: 10rem 9% 2rem;
    background: var(--second-bg-color);
}

.experience-container {
    display: flex;
    flex-direction: column;
    gap: 3rem;
    max-width: 80rem;
    margin: 0 auto;
    position: relative;
}

.experience-container::before {
    content: '';
    position: absolute;
    left: 2.8rem;
    top: 0;
    bottom: 0;
    width: 0.2rem;
    background: var(--main-color);
    opacity: 0.3;
}

.experience-box {
    display: flex;
    align-items: flex-start;
    gap: 2.5rem;
    background: var(--bg-color);
    padding: 2.5rem;
    border-radius: 1.5rem;
    border: 0.2rem solid var(--second-bg-color);
    transition: 0.5s ease;
    position: relative;
}

.experience-box:hover {
    border-color: var(--main-color);
    transform: translateX(0.5rem);
}

.experience-icon {
    flex-shrink: 0;
    width: 5.5rem;
    height: 5.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--bg-color);
    border-radius: 50%;
    border: 0.2rem solid var(--main-color);
    z-index: 1;
}

.experience-icon i {
    font-size: 2.4rem;
    color: var(--main-color);
}

.experience-content {
    flex: 1;
}

.experience-year {
    display: inline-block;
    font-size: 1.3rem;
    color: var(--main-color);
    font-weight: 600;
    margin-bottom: 0.6rem;
    letter-spacing: 0.05rem;
}

.experience-content h3 {
    font-size: 2rem;
    margin-bottom: 0.8rem;
    color: var(--text-color);
}

.experience-content p {
    font-size: 1.4rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .experience-container::before {
        left: 2.2rem;
    }

    .experience-box {
        padding: 2rem;
        gap: 1.5rem;
    }

    .experience-icon {
        width: 4.5rem;
        height: 4.5rem;
    }

    .experience-icon i {
        font-size: 2rem;
    }

    .experience-content h3 {
        font-size: 1.7rem;
    }
}

/* Project Preview */
.projects {
    padding: 8rem 9% 4rem;
}

.projects .heading {
    margin-bottom: 5rem;
}

.projects-container {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.preview-card {
    display: flex;
    background: var(--bg-color);
    border-radius: 2.5rem;
    overflow: hidden;
    cursor: pointer;
    border: 0.2rem solid var(--border-color);
    transition: 0.5s ease;
}

.preview-card:hover {
    border-color: var(--main-color);
    box-shadow: 0 0 3rem rgba(0, 238, 255, 0.12);
    transform: translateY(-4px);
}

.preview-mockup {
    flex: 1.2;
    position: relative;
    overflow: hidden;
}

.mockup-bar {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 1rem 1.5rem;
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(0.4rem);
    -webkit-backdrop-filter: blur(0.4rem);
    border-bottom: 0.1rem solid rgba(255, 255, 255, 0.1);
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 2;
}

.mockup-dot {
    width: 1rem;
    height: 1rem;
    border-radius: 50%;
}

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

.mockup-url {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.4);
    margin-left: 1rem;
    font-family: monospace;
}

.preview-mockup img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: 0.6s ease;
}

.preview-card:hover .preview-mockup img {
    transform: scale(1.08);
}

.preview-body {
    flex: 1;
    padding: 4rem 3.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.preview-badge {
    display: inline-block;
    align-self: flex-start;
    padding: 0.4rem 1.4rem;
    background: rgba(0, 238, 255, 0.12);
    border: 0.1rem solid var(--main-color);
    color: var(--main-color);
    font-size: 1rem;
    font-weight: 600;
    border-radius: 2rem;
    text-transform: uppercase;
    letter-spacing: 0.15rem;
    margin-bottom: 1.5rem;
}

.preview-body h2 {
    font-size: 3.2rem;
    color: var(--text-color);
    margin-bottom: 0.3rem;
}

.preview-sub {
    font-size: 1.5rem;
    color: var(--main-color);
    font-weight: 300;
    margin-bottom: 1.8rem;
}

.preview-desc {
    font-size: 1.4rem;
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.preview-tags {
    display: flex;
    gap: 0.7rem;
    flex-wrap: wrap;
    margin-bottom: 2.5rem;
}

.preview-tags span {
    padding: 0.3rem 1.1rem;
    background: rgba(0, 238, 255, 0.06);
    border: 0.1rem solid rgba(0, 238, 255, 0.25);
    border-radius: 2rem;
    font-size: 1.1rem;
    color: var(--main-color);
    font-weight: 500;
}

.preview-actions {
    display: flex;
    gap: 1.2rem;
    flex-wrap: wrap;
}

.preview-actions .btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.4rem;
}

.preview-actions .btn i {
    font-size: 1.7rem;
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1.2rem 2.4rem;
    border: 0.2rem solid var(--main-color);
    border-radius: 4rem;
    font-size: 1.4rem;
    color: var(--main-color);
    font-weight: 600;
    transition: 0.4s ease;
    cursor: pointer;
}

.btn-outline i {
    font-size: 1.7rem;
}

.btn-outline:hover {
    background: var(--main-color);
    color: var(--second-bg-color);
    box-shadow: 0 0 1.5rem rgba(0, 238, 255, 0.3);
}

.preview-card:hover .btn {
    box-shadow: 0 0 1.5rem rgba(0, 238, 255, 0.3);
}

/* Contact */
.contact h2 {
    margin-bottom: 3rem;
}

.contact .contact-social {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 4rem;
    margin-top: 5rem;
}

.contact .contact-social a {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 8rem;
    height: 8rem;
    background: transparent;
    border: 0.2rem solid var(--main-color);
    border-radius: 50%;
    font-size: 4rem;
    color: var(--main-color);
    transition: 0.5s ease;
}

.contact .contact-social a:hover {
    background: var(--main-color);
    color: var(--second-bg-color);
    box-shadow: 0 0 2rem var(--main-color);
    transform: scale(1.1);
}

.contact .contact-text {
    text-align: center;
    font-size: 1.8rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Footer */
.footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    padding: 2rem 9%;
    background: var(--second-bg-color);
}

.footer-text p {
    font-size: 1.4rem;
    color: var(--text-secondary);
}

/* Scroll to Top */
.scroll-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: 0.4s ease;
}

.scroll-top.show {
    opacity: 1;
    visibility: visible;
    animation: scrollTopPopIn 0.5s ease forwards;
}

.scroll-top a {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 4.5rem;
    height: 4.5rem;
    background: var(--main-color);
    border-radius: 50%;
    transition: 0.5s ease;
}

.scroll-top a:hover {
    box-shadow: 0 0 1.5rem var(--main-color);
    transform: translateY(-4px) scale(1.1);
}

.scroll-top a i {
    font-size: 2.4rem;
    color: var(--second-bg-color);
    transition: 0.3s ease;
}

.scroll-top a:hover i {
    animation: scrollTopBounce 0.6s ease;
}

@keyframes scrollTopPopIn {
    0% { transform: scale(0); opacity: 0; }
    60% { transform: scale(1.15); opacity: 0.9; }
    100% { transform: scale(1); opacity: 1; }
}

@keyframes scrollTopBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

/* Navbar Link Click Animation */
@keyframes navLinkPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.12); color: var(--main-color); }
    100% { transform: scale(1); }
}

.navbar a.animating,
.btn.animating,
.btn-outline.animating {
    animation: navLinkPulse 0.4s ease;
}

/* Theme Toggle */
#theme-toggle {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 4rem;
    height: 4rem;
    font-size: 2.4rem;
    color: var(--text-color);
    cursor: pointer;
    transition: 0.3s ease;
}

#theme-toggle:hover {
    color: var(--main-color);
    transform: rotate(15deg);
}

@media (max-width: 1200px) {
    html { font-size: 55%; }
}

@media (max-width: 991px) {
    .header { padding: 2rem 3%; }
    section { padding: 10rem 3% 2rem; }
    .skills { padding: 7rem 3% 2rem; }
    .experience { padding: 7rem 3% 2rem; }
    .projects { padding: 8rem 3% 4rem; }
    .footer { padding: 2rem 3%; }
    .preview-card { flex-direction: column; }
    .preview-body { padding: 3rem 2.5rem; }
}

@media (max-width: 768px) {
    #menu-icon { display: block; }

    .navbar {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        padding: 1rem 3%;
        background: var(--bg-color);
        border-top: 0.1rem solid var(--border-color);
        box-shadow: 0 0.5rem 1rem var(--shadow-color);
        display: none;
    }

    .navbar.active { display: block; }

    .navbar a {
        display: block;
        font-size: 2rem;
        margin: 3rem 0;
    }

    .home { flex-direction: column; }
    .home-content h3 { font-size: 2.6rem; }
    .home-content h1 { font-size: 4rem; }
    .home-img img { width: 60vw; margin-top: 2rem; }

    .about { flex-direction: column-reverse; }
    .about-img img { width: 60vw; }

    .skills h2 { margin-bottom: 3rem; }
}

@media (max-width: 450px) {
    html { font-size: 50%; }
}