:root {
    --accent: #645FAA;
    --accent-dark: #514c91;
    --accent-light: #eeecfa;

    --bg: #ffffff;
    --bg-secondary: #f8f8fa;
    --card: #ffffff;

    --text: #17171b;
    --text-secondary: #5e5e66;

    --border: #dedee4;

    --header-height: 76px;
    --container: 1180px;
    --radius: 18px;
    --transition: 0.25s ease;
}

[data-theme="dark"] {
    --bg: #111114;
    --bg-secondary: #19191e;
    --card: #1c1c21;

    --text: #f5f5f7;
    --text-secondary: #a4a4ad;

    --border: #303038;
    --accent-light: #292642;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: "Inter", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background var(--transition), color var(--transition);
}

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

button {
    font: inherit;
}

.container {
    width: min(var(--container), calc(100% - 48px));
    margin: 0 auto;
}

/* HEADER */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--border);
}

[data-theme="dark"] .header {
    background: rgba(17, 17, 20, 0.85);
}

.nav {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 22px;
    font-weight: 800;
    letter-spacing: -1px;
    color: var(--text);
}

.logo span {
    color: var(--accent);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 34px;
}

.nav-links a {
    position: relative;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    transition: color var(--transition);
}

.nav-links a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -7px;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.theme-toggle,
.menu-toggle {
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    cursor: pointer;
}

.theme-toggle {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    transition: all var(--transition);
}

.theme-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: rotate(15deg);
}

.menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.menu-toggle span {
    display: block;
    width: 18px;
    height: 1px;
    margin: 4px auto;
    background: currentColor;
}

/* HERO */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 100px;
    overflow: hidden;
    background: var(--bg);
}

.hero-decoration {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
}

.decoration-one {
    width: 500px;
    height: 500px;
    right: -200px;
    top: 120px;
    background: var(--accent);
    opacity: 0.08;
    filter: blur(100px);
}

.decoration-two {
    width: 250px;
    height: 250px;
    left: -120px;
    bottom: 50px;
    background: var(--accent);
    opacity: 0.04;
    filter: blur(80px);
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 100px;
    align-items: center;
}

.eyebrow,
.section-number {
    color: var(--accent);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1.8px;
}

.eyebrow {
    margin-bottom: 25px;
}

.hero h1 {
    font-size: clamp(65px, 9vw, 115px);
    line-height: 0.88;
    letter-spacing: -7px;
    font-weight: 800;
    margin-bottom: 35px;
    color: var(--text);
}

.hero h1 span {
    color: var(--accent);
}

.hero-description {
    max-width: 570px;
    color: var(--text-secondary);
    font-size: 20px;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 12px;
    margin-top: 35px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 14px 22px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    transition: all var(--transition);
}

.btn-primary {
    background: var(--accent);
    color: #ffffff;
}

.btn-primary:hover {
    background: var(--accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(100, 95, 170, 0.25);
}

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

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}

.hero-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 28px;
    color: var(--text-secondary);
    font-size: 12px;
}

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

/* HERO CARD */
.hero-card-wrapper {
    display: flex;
    justify-content: center;
}

.hero-card {
    width: 100%;
    max-width: 400px;
    min-height: 440px;
    padding: 28px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 20px 50px rgba(20, 20, 30, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.hero-card:hover {
    transform: translateY(-7px);
    border-color: var(--accent);
    box-shadow: 0 30px 70px rgba(20, 20, 30, 0.12);
}

.card-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.status {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 9px;
    font-weight: 700;
    letter-spacing: 1px;
}

.status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #4caf50;
    box-shadow: 0 0 0 4px rgba(76, 175, 80, 0.1);
}

.card-number {
    color: var(--text-secondary);
    font-size: 11px;
}

.card-main {
    margin-top: 80px;
}

.initials {
    width: 75px;
    height: 75px;
    display: grid;
    place-items: center;
    margin-bottom: 24px;
    border-radius: 14px;
    background: var(--accent);
    color: #ffffff;
    font-size: 24px;
    font-weight: 800;
}

.card-label {
    color: var(--text-secondary);
    font-size: 9px;
    font-weight: 700;
    letter-spacing: 1.4px;
    margin-bottom: 5px;
}

.card-main h2 {
    font-size: 28px;
    letter-spacing: -1px;
    color: var(--text);
}

.card-main > p:last-child {
    color: var(--text-secondary);
    margin-top: 3px;
    font-size: 14px;
}

.card-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    padding-top: 25px;
    border-top: 1px solid var(--border);
}

.card-info span {
    display: block;
    color: var(--text-secondary);
    font-size: 8px;
    letter-spacing: 1.2px;
    margin-bottom: 5px;
}

.card-info strong {
    font-size: 11px;
    font-weight: 600;
    color: var(--text);
}

/* SCROLL */
.scroll-indicator {
    position: absolute;
    bottom: 25px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    color: var(--text-secondary);
    font-size: 9px;
    letter-spacing: 1.5px;
}

/* SECTIONS */
.section {
    padding: 130px 0;
    border-top: 1px solid var(--border);
}

.section:nth-child(even) {
    background: var(--bg-secondary);
}

.section:nth-child(odd) {
    background: var(--bg);
}

.section-heading {
    margin-bottom: 70px;
}

.section-heading h2 {
    margin-top: 15px;
    font-size: clamp(42px, 5vw, 68px);
    line-height: 1;
    letter-spacing: -3px;
    color: var(--text);
}

.section-heading h2 span {
    color: var(--accent);
}

.heading-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 40px;
}

.heading-description {
    max-width: 350px;
    color: var(--text-secondary);
    font-size: 14px;
}

/* ABOUT */
.about-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 120px;
}

.about-text {
    max-width: 680px;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 22px;
}

.about-text .large-text {
    color: var(--text);
    font-size: 23px;
    line-height: 1.55;
}

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

.fact {
    display: grid;
    grid-template-columns: 50px 1fr;
    gap: 20px;
    padding: 22px 0;
    border-bottom: 1px solid var(--border);
}

.fact > span {
    color: var(--accent);
    font-size: 11px;
    font-weight: 600;
}

.fact strong {
    font-size: 14px;
    color: var(--text);
}

.fact p {
    color: var(--text-secondary);
    font-size: 13px;
    margin-top: 3px;
}

/* PROJECTS */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

.project-card {
    min-height: 440px;
    padding: 32px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border: 1px solid var(--border);
    background: var(--card);
    border-radius: var(--radius);
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: translateY(-6px);
    border-color: var(--accent);
    box-shadow: 0 20px 50px rgba(20, 20, 30, 0.08);
}

.project-featured {
    grid-column: span 2;
    min-height: 410px;
}

.project-top {
    display: flex;
    justify-content: space-between;
}

.project-number {
    color: var(--accent);
    font-size: 13px;
    font-weight: 700;
}

.project-type {
    color: var(--text-secondary);
    font-size: 9px;
    letter-spacing: 1.2px;
}

.project-category {
    color: var(--accent) !important;
    font-size: 9px !important;
    font-weight: 700;
    letter-spacing: 1.4px;
    margin-bottom: 10px;
}

.project-content {
    max-width: 700px;
}

.project-content h3 {
    font-size: 31px;
    letter-spacing: -1.5px;
    margin-bottom: 15px;
    color: var(--text);
}

.project-content p {
    color: var(--text-secondary);
    max-width: 600px;
    font-size: 14px;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    margin-top: 25px;
}

.tags span {
    padding: 7px 11px;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 10px;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-top: 30px;
    color: var(--accent);
    font-size: 12px;
    font-weight: 600;
}

.project-link span {
    transition: transform var(--transition);
}

.project-link:hover span {
    transform: translate(3px, -3px);
}

/* SKILLS */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
}

.skill-group {
    padding: 45px;
    background: var(--card);
    min-height: 220px;
}

.skill-label {
    color: var(--accent);
    font-size: 9px;
    font-weight: 700;
    letter-spacing: 1.5px;
    margin-bottom: 25px;
}

.skill-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-list span {
    padding: 9px 13px;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 13px;
}

.language-list {
    display: flex;
    flex-direction: column;
}

.language {
    display: flex;
    justify-content: space-between;
    padding: 9px 0;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
    color: var(--text);
}

.language strong {
    color: var(--accent);
    font-size: 11px;
}

/* EDUCATION */
.timeline {
    border-top: 1px solid var(--border);
}

.timeline-item {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 70px;
    padding: 45px 0;
    border-bottom: 1px solid var(--border);
}

.timeline-date {
    color: var(--accent);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
}

.timeline-category {
    color: var(--text-secondary);
    font-size: 9px;
    letter-spacing: 1.5px;
}

.timeline-content h3 {
    margin-top: 7px;
    font-size: 29px;
    letter-spacing: -1px;
    color: var(--text);
}

.timeline-content h4 {
    color: var(--accent);
    font-size: 17px;
    font-weight: 600;
    margin-top: 2px;
}

.timeline-content > p {
    color: var(--text-secondary);
    margin-top: 15px;
    font-size: 14px;
}

.education-meta {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.education-meta span {
    padding: 6px 10px;
    background: var(--accent-light);
    color: var(--accent);
    border-radius: 5px;
    font-size: 10px;
    font-weight: 600;
}

.certifications {
    margin-top: 100px;
}

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

.certification-list {
    border-top: 1px solid var(--border);
}

.certification {
    display: flex;
    justify-content: space-between;
    gap: 30px;
    padding: 25px 0;
    border-bottom: 1px solid var(--border);
}

.certification h3 {
    font-size: 14px;
    color: var(--text);
}

.certification p {
    color: var(--text-secondary);
    font-size: 12px;
    margin-top: 4px;
}

.certification > span {
    white-space: nowrap;
    color: var(--text-secondary);
    font-size: 11px;
}

/* CONTACT (ФИКС КОНТРАСТА) */
.contact {
    padding-bottom: 90px;
}

.contact-box {
    display: grid;
    grid-template-columns: 1fr 0.8fr;
    gap: 100px;
    padding: 70px;
    background: var(--accent);
    color: #ffffff;
    border-radius: var(--radius);
    overflow: hidden;
    position: relative;
}

.contact-box::after {
    content: "";
    position: absolute;
    width: 400px;
    height: 400px;
    right: -200px;
    bottom: -250px;
    border-radius: 50%;
    background: #ffffff;
    opacity: 0.06;
}

.contact-box .section-number {
    color: rgba(255, 255, 255, 0.75);
}

.contact-box h2 {
    max-width: 600px;
    margin-top: 18px;
    font-size: clamp(40px, 5vw, 65px);
    line-height: 1;
    letter-spacing: -3px;
    color: #ffffff;
}

.contact-box h2 span {
    color: #e2e0ff;
}

.contact-description {
    max-width: 500px;
    margin-top: 25px;
    color: rgba(255, 255, 255, 0.85);
    font-size: 14px;
}

.contact-links {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.contact-link {
    display: grid;
    grid-template-columns: 60px 1fr 20px;
    gap: 15px;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    color: #ffffff;
}

.contact-link:first-child {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.contact-link > span:first-child {
    color: rgba(255, 255, 255, 0.65);
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.contact-link strong {
    font-size: 12px;
    font-weight: 500;
    overflow-wrap: anywhere;
    color: #ffffff;
}

.contact-link > span:last-child {
    text-align: right;
    color: #ffffff;
}

.contact-link:hover strong {
    text-decoration: underline;
}

/* FOOTER */
.footer {
    padding: 30px 0;
    border-top: 1px solid var(--border);
    background: var(--bg);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    color: var(--text-secondary);
    font-size: 10px;
}

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

/* MOBILE RESPONSIVE */
@media (max-width: 900px) {
    .nav-links {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        padding: 25px;
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        transform: translateY(-120%);
        transition: transform 0.3s ease;
    }

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

    .menu-toggle {
        display: block;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 70px;
    }

    .hero-card-wrapper {
        justify-content: flex-start;
    }

    .hero-card {
        max-width: 500px;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 70px;
    }

    .contact-box {
        grid-template-columns: 1fr;
        gap: 60px;
    }
}

@media (max-width: 700px) {
    .container {
        width: min(calc(100% - 32px), var(--container));
    }

    .section {
        padding: 90px 0;
    }

    .hero {
        padding-top: 110px;
    }

    .hero h1 {
        font-size: clamp(55px, 17vw, 85px);
        letter-spacing: -4px;
    }

    .hero-description {
        font-size: 17px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        width: 100%;
    }

    .scroll-indicator {
        display: none;
    }

    .section-heading {
        margin-bottom: 45px;
    }

    .section-heading h2 {
        font-size: 44px;
        letter-spacing: -2px;
    }

    .heading-row {
        flex-direction: column;
        align-items: flex-start;
    }

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

    .project-featured {
        grid-column: auto;
    }

    .project-content h3 {
        font-size: 27px;
    }

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

    .skill-group {
        padding: 30px;
    }

    .timeline-item {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .certification {
        flex-direction: column;
        gap: 8px;
    }

    .contact-box {
        padding: 35px 25px;
    }

    .contact-box h2 {
        letter-spacing: -2px;
    }

    .contact-link {
        grid-template-columns: 1fr 20px;
    }

    .contact-link > span:first-child {
        display: none;
    }

    .footer-content {
        flex-direction: column;
        gap: 8px;
    }
}