:root {
    --bg: #06111f;
    --bg-deep: #030914;
    --bg-soft: #0b1828;

    --card: rgba(15, 34, 55, 0.84);
    --card-hover: rgba(20, 44, 70, 0.96);

    --text: #f5f9ff;
    --muted: #a8b7ca;

    --blue: #4aa8ff;
    --cyan: #54e0ff;
    --purple: #9a7cff;

    --gradient:
        linear-gradient(135deg,
            #4aa8ff,
            #54e0ff,
            #9a7cff);

    --border:
        rgba(255, 255, 255, 0.09);

    --border-blue:
        rgba(84, 224, 255, 0.28);

    --shadow:
        0 20px 50px rgba(0, 0, 0, 0.28);
}


/* =========================
   RESET
========================= */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family:
        Arial,
        Helvetica,
        sans-serif;

    background: var(--bg);

    color: var(--text);

    line-height: 1.65;

    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    width: min(1120px, 90%);
    margin: 0 auto;
}


/* Sticky nav offset */

section[id] {
    scroll-margin-top: 78px;
}


/* =========================
   NAVBAR
========================= */

.header {
    position: sticky;
    top: 0;

    z-index: 1000;

    background:
        linear-gradient(180deg,
            rgba(3, 9, 20, 0.86),
            rgba(6, 17, 31, 0.68));

    backdrop-filter:
        blur(18px) saturate(140%);

    -webkit-backdrop-filter:
        blur(18px) saturate(140%);

    border-bottom:
        1px solid rgba(255, 255, 255, 0.05);

    box-shadow:
        0 8px 28px rgba(0, 0, 0, 0.10);

    transition:
        background 0.3s ease,
        box-shadow 0.3s ease;
}


/* subtle animated line */

.header::after {
    content: "";

    position: absolute;

    left: 0;
    bottom: 0;

    width: 100%;
    height: 1px;

    background:
        linear-gradient(90deg,
            transparent,
            var(--blue),
            var(--cyan),
            var(--purple),
            transparent);

    background-size: 200% 100%;

    opacity: 0.42;

    animation:
        navLine 8s linear infinite;
}


@keyframes navLine {

    from {
        background-position:
            0% 50%;
    }

    to {
        background-position:
            200% 50%;
    }
}


.header.scrolled {
    background:
        rgba(3, 9, 20, 0.95);

    box-shadow:
        0 12px 32px rgba(0, 0, 0, 0.26);
}


.nav-container {
    position: relative;

    min-height: 72px;

    display: flex;

    align-items: center;

    justify-content: space-between;

    transition:
        min-height 0.3s ease;
}


.header.scrolled .nav-container {
    min-height: 64px;
}


/* =========================
   LOGO
========================= */

.logo-link {
    display: flex;
    align-items: center;

    flex-shrink: 0;
}


.site-logo {
    width: 56px;
    height: 56px;

    object-fit: contain;

    border-radius: 13px;

    box-shadow:
        0 8px 20px rgba(0, 0, 0, 0.20);

    transition:
        width 0.3s ease,
        height 0.3s ease,
        transform 0.3s ease;
}


.site-logo:hover {
    transform:
        translateY(-2px) scale(1.03);
}


.header.scrolled .site-logo {
    width: 48px;
    height: 48px;
}


/* =========================
   DESKTOP NAV
========================= */

.nav {
    display: flex;

    align-items: center;

    gap: 6px;
}


.nav a {
    position: relative;

    padding:
        8px 13px;

    color:
        rgba(222, 233, 244, 0.76);

    font-size: 0.94rem;

    font-weight: 500;

    border-radius: 9px;

    transition:
        color 0.3s ease,
        background 0.3s ease,
        transform 0.3s ease;
}


.nav a:hover,
.nav a.active {
    color: #ffffff;

    background:
        linear-gradient(135deg,
            rgba(74, 168, 255, 0.10),
            rgba(154, 124, 255, 0.07));
}


.nav a:hover {
    transform:
        translateY(-2px);
}


.nav a::after {
    content: "";

    position: absolute;

    left: 50%;
    bottom: 3px;

    width: 0;
    height: 2px;

    transform:
        translateX(-50%);

    background: var(--gradient);

    border-radius: 10px;

    transition:
        width 0.3s ease;
}


.nav a:hover::after,
.nav a.active::after {
    width: 38%;
}


/* =========================
   HAMBURGER
========================= */

.menu-toggle {
    display: none;

    width: 44px;
    height: 44px;

    padding: 9px;

    border:
        1px solid rgba(255, 255, 255, 0.09);

    border-radius: 10px;

    background:
        rgba(255, 255, 255, 0.035);

    cursor: pointer;
}


.menu-toggle span {
    display: block;

    width: 100%;
    height: 2px;

    margin: 5px 0;

    background: #ffffff;

    border-radius: 10px;

    transition:
        transform 0.3s ease,
        opacity 0.3s ease;
}


.menu-toggle.active span:nth-child(1) {
    transform:
        translateY(7px) rotate(45deg);
}


.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}


.menu-toggle.active span:nth-child(3) {
    transform:
        translateY(-7px) rotate(-45deg);
}


/* =========================
   HERO
========================= */

.hero {
    position: relative;

    padding:
        58px 0 62px;

    overflow: hidden;

    background:
        radial-gradient(circle at 80% 20%,
            rgba(74, 168, 255, 0.17),
            transparent 29%),
        radial-gradient(circle at 18% 85%,
            rgba(154, 124, 255, 0.10),
            transparent 30%),
        linear-gradient(180deg,
            #06111f,
            #081827);
}


.hero-content {
    display: grid;

    grid-template-columns:
        1.25fr 0.75fr;

    gap: 44px;

    align-items: center;
}


.hero-label,
.section-label,
.project-type {
    color: var(--cyan);

    font-size: 0.76rem;

    letter-spacing: 0.15em;

    font-weight: 700;
}


.hero h1 {
    margin:
        12px 0;

    font-size:
        clamp(3rem, 6vw, 4.8rem);

    line-height: 1.03;

    letter-spacing: -0.04em;
}


.hero h1 span {
    background: var(--gradient);

    -webkit-background-clip: text;

    background-clip: text;

    color: transparent;
}


.hero h2 {
    margin-bottom: 17px;

    color: #c4d0df;

    font-size: 1.24rem;

    font-weight: 500;
}


.hero-description {
    max-width: 640px;

    color: var(--muted);

    font-size: 1.02rem;
}


/* =========================
   BUTTONS
========================= */

.hero-buttons {
    display: flex;

    flex-wrap: wrap;

    gap: 13px;

    margin-top: 22px;
}


.btn {
    display: inline-block;

    padding:
        12px 20px;

    border-radius: 10px;

    font-weight: 700;

    transition:
        transform 0.3s ease,
        box-shadow 0.3s ease;
}


.btn-primary {
    background: var(--gradient);

    color: #04111d;
}


.btn-primary:hover {
    transform:
        translateY(-3px);

    box-shadow:
        0 12px 28px rgba(74, 168, 255, 0.20);
}


.btn-secondary {
    color: var(--text);

    border:
        1px solid var(--border);

    background:
        rgba(255, 255, 255, 0.02);
}


.btn-secondary:hover {
    transform:
        translateY(-3px);

    border-color:
        var(--border-blue);

    background:
        rgba(74, 168, 255, 0.07);
}


/* =========================
   CLOUD CARD
========================= */

.cloud-card {
    padding: 30px;

    text-align: center;

    background:
        linear-gradient(145deg,
            rgba(17, 36, 59, 0.95),
            rgba(8, 22, 38, 0.96));

    border:
        1px solid var(--border);

    border-radius: 22px;

    box-shadow: var(--shadow);

    transition:
        transform 0.3s ease,
        border-color 0.3s ease;
}


.cloud-card:hover {
    transform:
        translateY(-5px);

    border-color:
        var(--border-blue);
}


.cloud-icon {
    margin-bottom: 8px;

    font-size: 3rem;
}


.cloud-card h3 {
    font-size: 1.45rem;
}


.cloud-card p {
    margin-top: 6px;

    color: var(--muted);
}


.visitor-box {
    margin-top: 20px;

    padding: 17px;

    background:
        linear-gradient(135deg,
            rgba(74, 168, 255, 0.10),
            rgba(154, 124, 255, 0.07));

    border:
        1px solid rgba(84, 224, 255, 0.18);

    border-radius: 14px;
}


.visitor-label {
    display: block;

    color: var(--muted);

    font-size: 0.84rem;
}


.visitor-number {
    display: block;

    margin-top: 3px;

    color: var(--cyan);

    font-size: 1.9rem;

    font-weight: 800;
}


/* =========================
   SECTIONS
========================= */

.section {
    padding:
        60px 0;
}


.section-alt {
    background:
        linear-gradient(180deg,
            #0a1726,
            #0c1b2c);
}


.section-heading {
    margin-bottom: 30px;
}


.section-heading h2 {
    margin-top: 7px;

    font-size:
        clamp(2rem, 4vw, 2.8rem);

    line-height: 1.15;
}


/* =========================
   ABOUT
========================= */

.about-grid {
    display: grid;

    grid-template-columns:
        1fr 1fr;

    gap: 42px;

    align-items: center;
}


.about-text p {
    margin-bottom: 14px;

    color: var(--muted);
}


.about-stats {
    display: grid;

    grid-template-columns:
        repeat(2, 1fr);

    gap: 15px;
}


.stat-card {
    padding: 21px;

    background: var(--card);

    border:
        1px solid var(--border);

    border-radius: 16px;

    transition:
        transform 0.3s ease,
        border-color 0.3s ease;
}


.stat-card:hover {
    transform:
        translateY(-4px);

    border-color:
        var(--border-blue);
}


.stat-card strong {
    display: block;

    color: var(--cyan);

    font-size: 1.25rem;
}


.stat-card span {
    color: var(--muted);

    font-size: 0.88rem;
}


/* =========================
   SKILLS
========================= */

.skills-grid {
    display: grid;

    grid-template-columns:
        repeat(3, 1fr);

    gap: 18px;
}


.skill-card {
    padding: 24px;

    background: var(--card);

    border:
        1px solid var(--border);

    border-radius: 18px;

    transition:
        transform 0.3s ease,
        border-color 0.3s ease,
        background 0.3s ease;
}


.skill-card:hover {
    transform:
        translateY(-5px);

    border-color:
        var(--border-blue);

    background:
        var(--card-hover);
}


.skill-icon {
    margin-bottom: 12px;

    font-size: 1.9rem;
}


.skill-card h3 {
    margin-bottom: 8px;
}


.skill-card p {
    color: var(--muted);
}


/* =========================
   PROJECTS
========================= */

.projects-grid {
    display: grid;

    grid-template-columns:
        repeat(2, 1fr);

    gap: 20px;
}


.project-card {
    position: relative;

    padding: 26px;

    background: var(--card);

    border:
        1px solid var(--border);

    border-radius: 20px;

    transition:
        transform 0.3s ease,
        border-color 0.3s ease,
        box-shadow 0.3s ease;
}


.project-card:hover {
    transform:
        translateY(-5px);

    border-color:
        var(--border-blue);

    box-shadow:
        0 16px 36px rgba(0, 0, 0, 0.22);
}


.project-card.featured {
    background:
        linear-gradient(145deg,
            rgba(74, 168, 255, 0.12),
            rgba(154, 124, 255, 0.07),
            rgba(15, 34, 55, 0.95));
}


.project-number {
    position: absolute;

    top: 18px;
    right: 22px;

    color:
        rgba(255, 255, 255, 0.06);

    font-size: 2.3rem;

    font-weight: 800;
}


.project-card h3 {
    margin:
        9px 0 11px;

    font-size: 1.35rem;
}


.project-card p {
    color: var(--muted);
}


.tags {
    display: flex;

    flex-wrap: wrap;

    gap: 7px;

    margin:
        18px 0;
}


.tags span {
    padding:
        5px 9px;

    color: var(--cyan);

    font-size: 0.76rem;

    border:
        1px solid rgba(84, 224, 255, 0.17);

    border-radius: 999px;

    background:
        rgba(84, 224, 255, 0.06);
}


.project-link {
    color: var(--cyan);

    font-weight: 700;
}


.project-link:hover {
    color: var(--purple);
}


/* =========================
   EDUCATION
========================= */

.education-card {
    padding: 27px;

    background:
        linear-gradient(135deg,
            rgba(74, 168, 255, 0.07),
            rgba(154, 124, 255, 0.05),
            var(--card));

    border:
        1px solid var(--border);

    border-radius: 19px;
}


.education-card h3 {
    font-size: 1.35rem;
}


.education-card p {
    margin-top: 8px;

    color: var(--muted);
}


/* =========================
   ARCHITECTURE
========================= */

.architecture {
    display: flex;

    flex-wrap: wrap;

    align-items: center;

    justify-content: center;

    gap: 13px;
}


.architecture-item {
    min-width: 115px;

    padding:
        16px 18px;

    text-align: center;

    background: var(--card);

    border:
        1px solid var(--border);

    border-radius: 14px;

    transition:
        transform 0.3s ease,
        border-color 0.3s ease;
}


.architecture-item:hover {
    transform:
        translateY(-4px);

    border-color:
        var(--border-blue);
}


.architecture-item span {
    display: block;

    margin-bottom: 4px;

    font-size: 1.6rem;
}


.arrow {
    color: var(--cyan);

    font-size: 1.4rem;
}


/* =========================
   CONTACT
========================= */

.contact-section {
    padding:
        62px 0;

    background:
        radial-gradient(circle at center,
            rgba(74, 168, 255, 0.10),
            transparent 40%),
        var(--bg-soft);
}


.contact-content {
    max-width: 680px;

    margin: auto;

    text-align: center;
}


.contact-content h2 {
    margin:
        7px 0 12px;

    font-size: 2.7rem;
}


.contact-content p {
    color: var(--muted);
}


.contact-links {
    display: flex;

    flex-wrap: wrap;

    justify-content: center;

    gap: 13px;

    margin-top: 23px;
}


.contact-links a {
    padding:
        10px 17px;

    border:
        1px solid var(--border);

    border-radius: 10px;

    transition:
        transform 0.3s ease,
        border-color 0.3s ease,
        background 0.3s ease;
}


.contact-links a:hover {
    transform:
        translateY(-3px);

    border-color:
        var(--border-blue);

    background:
        rgba(74, 168, 255, 0.07);
}


/* =========================
   FOOTER
========================= */

.footer {
    background:
        var(--bg-deep);

    border-top:
        1px solid var(--border);
}


.footer-content {
    min-height: 76px;

    display: flex;

    align-items: center;

    justify-content:
        space-between;

    color: var(--muted);

    font-size: 0.88rem;
}


/* =========================
   TABLET
========================= */

@media (max-width: 950px) {

    .hero-content,
    .about-grid {
        grid-template-columns: 1fr;
    }

    .hero-content {
        gap: 32px;
    }

    .cloud-card {
        max-width: 560px;
    }

    .skills-grid {
        grid-template-columns:
            repeat(2, 1fr);
    }

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


/* =========================
   MOBILE
========================= */

@media (max-width: 700px) {

    .container {
        width: 92%;
    }

    section[id] {
        scroll-margin-top: 70px;
    }

    .nav-container {
        min-height: 66px;
    }

    .header.scrolled .nav-container {
        min-height: 60px;
    }

    .site-logo {
        width: 48px;
        height: 48px;
    }

    .header.scrolled .site-logo {
        width: 43px;
        height: 43px;
    }

    .menu-toggle {
        display: block;
        z-index: 1100;
    }

    .nav {
        position: absolute;

        top: 72px;

        left: 0;
        right: 0;

        display: flex;

        flex-direction: column;

        gap: 3px;

        padding: 11px;

        background:
            linear-gradient(180deg,
                rgba(7, 17, 31, 0.97),
                rgba(9, 24, 39, 0.95));

        backdrop-filter:
            blur(20px);

        -webkit-backdrop-filter:
            blur(20px);

        border:
            1px solid var(--border);

        border-radius: 14px;

        box-shadow:
            0 20px 45px rgba(0, 0, 0, 0.38);

        opacity: 0;

        visibility: hidden;

        pointer-events: none;

        transform:
            translateY(-8px);

        transition:
            opacity 0.3s ease,
            transform 0.3s ease,
            visibility 0.3s ease;
    }

    .nav.active {
        opacity: 1;

        visibility: visible;

        pointer-events: auto;

        transform:
            translateY(0);
    }

    .nav a {
        width: 100%;

        padding:
            12px 13px;

        border-radius: 8px;

        font-size: 0.98rem;
    }

    .nav a:hover {
        transform: none;
    }

    .nav a::after {
        display: none;
    }

    .hero {
        padding:
            40px 0 48px;
    }

    .hero-content {
        gap: 28px;
    }

    .hero h1 {
        font-size:
            clamp(2.65rem,
                13vw,
                3.4rem);
    }

    .hero h2 {
        font-size: 1.06rem;
    }

    .hero-description {
        font-size: 0.98rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .cloud-card {
        width: 100%;

        padding: 24px;
    }

    .section {
        padding:
            48px 0;
    }

    .section-heading {
        margin-bottom: 25px;
    }

    .skills-grid,
    .about-stats {
        grid-template-columns: 1fr;
    }

    .skill-card,
    .project-card,
    .education-card {
        padding: 22px;
    }

    .architecture {
        flex-direction: column;
    }

    .arrow {
        transform:
            rotate(90deg);
    }

    .architecture-item {
        width:
            min(100%, 280px);
    }

    .contact-section {
        padding:
            50px 0;
    }

    .contact-content h2 {
        font-size: 2.2rem;
    }

    .contact-links {
        flex-direction: column;
    }

    .contact-links a {
        width: 100%;
    }

    .footer-content {
        min-height: 96px;

        flex-direction: column;

        justify-content: center;

        gap: 4px;

        text-align: center;
    }
}


/* =========================
   SMALL MOBILE
========================= */

@media (max-width: 420px) {

    .hero {
        padding-top: 36px;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .section-heading h2 {
        font-size: 1.9rem;
    }

    .cloud-card {
        padding: 21px;
    }
}


/* =========================
   ACCESSIBILITY
========================= */

@media (prefers-reduced-motion: reduce) {

    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
    }
}