:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-card: #ffffff;
    --text-primary: #0a0a0f;
    --text-secondary: #4a5568;
    --text-muted: #a0aec0;

    --accent-primary: #2563eb;
    --accent-secondary: #1d4ed8;
    --accent-light: #eff6ff;

    --border-color: #e5e7eb;

    --container-width: 1200px;
    --section-padding: 120px;
    --section-padding-mobile: 60px;

    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-primary: #0a0a0f;
    --bg-secondary: #13131a;
    --bg-card: rgba(30, 30, 40, 0.6);
    --text-primary: #f8f9fa;
    --text-secondary: #a0a0a8;
    --text-muted: #6b6b75;

    --accent-primary: #3b82f6;
    --accent-secondary: #60a5fa;
    --accent-light: rgba(59, 130, 246, 0.1);

    --border-color: rgba(255, 255, 255, 0.05);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    transition: var(--transition-smooth);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
}

[data-theme="dark"] body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(96, 165, 250, 0.08) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-smooth);
}

ul {
    list-style: none;
}

.theme-toggle {
    position: fixed;
    top: 100px;
    right: 40px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1001;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 30px rgba(0, 0, 0, 0.15);
}

.theme-toggle .sun-icon {
    display: none;
    color: var(--accent-primary);
}

.theme-toggle .moon-icon {
    display: block;
    color: var(--accent-primary);
}

[data-theme="dark"] .theme-toggle .sun-icon {
    display: block;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: none;
}

.nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 20px 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition-smooth);
}

[data-theme="dark"] .nav {
    background: rgba(10, 10, 15, 0.8);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--accent-primary);
}

[data-theme="dark"] .nav-logo {
    background: linear-gradient(135deg, #3b82f6 0%, #60a5fa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: 40px;
    align-items: center;
}

.nav-link {
    font-size: 14px;
    font-weight: 400;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
    transition: var(--transition-smooth);
}

.nav-link:hover {
    color: var(--text-primary);
}

.btn-contact {
    padding: 10px 24px;
    background: var(--accent-primary);
    border-radius: 8px;
    color: white !important;
}

.btn-contact:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.3);
}

[data-theme="dark"] .btn-contact:hover {
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 40px;
}

.section {
    padding: var(--section-padding) 0;
}

.section-header {
    margin-bottom: 60px;
    text-align: center;
}

.section-label {
    display: inline-block;
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: none;
    text-align: center;
}

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

.btn-primary:hover {
    background: var(--accent-secondary);
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(37, 99, 235, 0.3);
}

[data-theme="dark"] .btn-primary {
    background: linear-gradient(135deg, #3b82f6 0%, #60a5fa 100%);
}

[data-theme="dark"] .btn-primary:hover {
    box-shadow: 0 15px 40px rgba(59, 130, 246, 0.4);
}

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

.btn-secondary:hover {
    background: var(--text-primary);
    color: var(--bg-primary);
}

[data-theme="dark"] .btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: 80px;
}

.hero-container {
    width: 100%;
    max-width: var(--container-width);
    padding: 0 40px;
}

.hero-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-avatar {
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease-out;
}

.avatar-img {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    margin: 0 auto;
    border: 4px solid var(--accent-light);
    box-shadow: 0 20px 60px rgba(37, 99, 235, 0.15);
}

[data-theme="dark"] .avatar-img {
    border-color: rgba(59, 130, 246, 0.2);
    box-shadow: 0 20px 60px rgba(59, 130, 246, 0.2);
}

.hero-title {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-greeting {
    font-size: 18px;
    font-weight: 400;
    color: var(--text-secondary);
}

.hero-name {
    font-size: 72px;
    font-weight: 700;
    line-height: 1.1;
    color: var(--text-primary);
}

[data-theme="dark"] .hero-name {
    background: linear-gradient(135deg, #f8f9fa 0%, #60a5fa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 28px;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: 30px;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-description {
    font-size: 20px;
    line-height: 1.8;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 50px;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

.highlight {
    color: var(--accent-primary);
    font-weight: 600;
}

[data-theme="dark"] .highlight {
    color: var(--accent-secondary);
}

.hero-cta {
    display: flex;
    gap: 20px;
    justify-content: center;
    animation: fadeInUp 0.8s ease-out 0.8s both;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 2px;
    animation: fadeIn 1s ease-out 1s both;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--accent-primary), transparent);
    animation: scrollLine 2s ease-in-out infinite;
}

.about {
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.about-text {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.lead {
    font-size: 22px;
    line-height: 1.6;
    color: var(--text-primary);
}

.about-text p {
    font-size: 17px;
    line-height: 1.8;
    color: var(--text-secondary);
}

.about-text strong {
    color: var(--accent-primary);
    font-weight: 600;
}

[data-theme="dark"] .about-text strong {
    color: var(--accent-secondary);
}

.about-highlights {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.highlight-card {
    padding: 30px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    transition: var(--transition-smooth);
    cursor: default;
}

[data-theme="dark"] .highlight-card {
    backdrop-filter: blur(10px);
}

.highlight-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(37, 99, 235, 0.1);
    border-color: var(--accent-primary);
}

[data-theme="dark"] .highlight-card:hover {
    background: rgba(30, 30, 40, 0.8);
    border-color: rgba(59, 130, 246, 0.3);
}

.highlight-icon {
    font-size: 32px;
    margin-bottom: 12px;
}

.highlight-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.highlight-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.expertise {
    background: var(--bg-primary);
}

[data-theme="dark"] .expertise {
    background: var(--bg-secondary);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.expertise-card {
    padding: 40px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    transition: var(--transition-smooth);
    cursor: default;
}

[data-theme="dark"] .expertise-card {
    backdrop-filter: blur(10px);
}

.expertise-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(37, 99, 235, 0.1);
    border-color: var(--accent-primary);
}

[data-theme="dark"] .expertise-card:hover {
    background: rgba(30, 30, 40, 0.8);
    border-color: rgba(59, 130, 246, 0.4);
    box-shadow: 0 20px 60px rgba(59, 130, 246, 0.15);
}

.card-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-primary);
    border-radius: 12px;
    margin-bottom: 24px;
    color: white;
}

[data-theme="dark"] .card-icon {
    background: linear-gradient(135deg, #3b82f6 0%, #60a5fa 100%);
}

.expertise-card h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.expertise-card p {
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.card-tags span {
    padding: 6px 12px;
    background: var(--accent-light);
    color: var(--accent-primary);
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 400;
}

[data-theme="dark"] .card-tags span {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-secondary);
    border-color: rgba(59, 130, 246, 0.2);
}

.experience {
    background: var(--bg-secondary);
}

[data-theme="dark"] .experience {
    background: var(--bg-primary);
}

.experience-content {
    max-width: 900px;
    margin: 0 auto;
}

.experience-card {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 40px;
    padding: 50px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    margin-bottom: 60px;
}

[data-theme="dark"] .experience-card {
    backdrop-filter: blur(10px);
}

.experience-period {
    font-size: 15px;
    font-weight: 600;
    color: var(--accent-primary);
    padding-top: 5px;
    line-height: 1.5;
}

.experience-details h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.experience-role {
    margin-bottom: 0;
}

.experience-promotion {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 2px dashed var(--border-color);
    position: relative;
}

.promotion-badge {
    display: inline-block;
    padding: 6px 14px;
    background: var(--accent-light);
    color: var(--accent-primary);
    border: 1px solid var(--accent-primary);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

[data-theme="dark"] .promotion-badge {
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent-secondary);
    border-color: var(--accent-secondary);
}

.role-period {
    font-size: 16px;
    font-weight: 400;
    color: var(--text-muted);
    margin-left: 8px;
}

.role-date-label {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 8px;
    opacity: 0.8;
}

.experience-promotion h3 {
    font-size: 22px;
}

.company {
    font-size: 18px;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: 8px;
}

[data-theme="dark"] .company {
    color: var(--accent-secondary);
}

.experience-location {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 16px;
    font-style: italic;
}

.description {
    font-size: 17px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.achievements {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.achievements li {
    padding-left: 28px;
    position: relative;
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.achievements li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: 700;
}

.values-section {
    max-width: 900px;
    margin: 0 auto;
}

.values-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 40px;
    text-align: center;
    color: var(--text-primary);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.value-item {
    display: flex;
    gap: 20px;
    padding: 30px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    transition: var(--transition-smooth);
    cursor: default;
}

[data-theme="dark"] .value-item {
    backdrop-filter: blur(10px);
}

.value-item:hover {
    transform: translateX(10px);
    box-shadow: 0 10px 40px rgba(37, 99, 235, 0.1);
    border-color: var(--accent-primary);
}

[data-theme="dark"] .value-item:hover {
    background: rgba(30, 30, 40, 0.8);
    border-color: rgba(59, 130, 246, 0.3);
}

.value-number {
    font-size: 24px;
    font-weight: 700;
    color: var(--accent-primary);
    flex-shrink: 0;
}

.value-item p {
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.contact {
    background: var(--bg-primary);
}

[data-theme="dark"] .contact {
    background: var(--bg-secondary);
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-title {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--accent-primary);
}

[data-theme="dark"] .contact-title {
    background: linear-gradient(135deg, #3b82f6 0%, #60a5fa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.contact-description {
    font-size: 18px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 60px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 30px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    transition: var(--transition-smooth);
    cursor: pointer;
}

[data-theme="dark"] .contact-link {
    backdrop-filter: blur(10px);
}

.contact-link:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 60px rgba(37, 99, 235, 0.15);
    border-color: var(--accent-primary);
}

[data-theme="dark"] .contact-link:hover {
    background: rgba(30, 30, 40, 0.8);
    border-color: rgba(59, 130, 246, 0.4);
    box-shadow: 0 20px 60px rgba(59, 130, 246, 0.2);
}

.contact-link svg {
    color: var(--accent-primary);
    flex-shrink: 0;
}

.contact-link > div {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
}

.link-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.link-value {
    font-size: 16px;
    font-weight: 400;
    color: var(--text-primary);
}

.footer {
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
    background: var(--bg-secondary);
}

[data-theme="dark"] .footer {
    background: var(--bg-primary);
}

.footer p {
    font-size: 14px;
    color: var(--text-muted);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes scrollLine {
    0%, 100% {
        transform: scaleY(1);
        opacity: 1;
    }
    50% {
        transform: scaleY(1.5);
        opacity: 0.5;
    }
}

@media (max-width: 1024px) {
    :root {
        --section-padding: 80px;
    }

    .theme-toggle {
        right: 24px;
        top: 90px;
    }

    .hero-name {
        font-size: 56px;
    }

    .section-title {
        font-size: 40px;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 50px;
    }

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

    .experience-card {
        grid-template-columns: 1fr;
        gap: 20px;
    }

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

@media (max-width: 768px) {
    :root {
        --section-padding: 60px;
    }

    .container,
    .nav-container,
    .hero-container {
        padding: 0 24px;
    }

    .theme-toggle {
        width: 44px;
        height: 44px;
        right: 20px;
        top: 80px;
    }

    .nav-menu {
        gap: 20px;
    }

    .nav-link {
        font-size: 13px;
    }

    .hero-name {
        font-size: 42px;
    }

    .hero-subtitle {
        font-size: 22px;
    }

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

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

    .hero-scroll {
        display: none;
    }

    .section-title {
        font-size: 32px;
    }

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

    .contact-title {
        font-size: 40px;
    }
}

@media (max-height: 1000px) {
    .hero-scroll {
        display: none;
    }
}

@media (max-width: 480px) {
    .nav-menu {
        display: none;
    }

    .hero-name {
        font-size: 36px;
    }

    .avatar-img {
        width: 150px;
        height: 150px;
    }

    .theme-toggle {
        width: 40px;
        height: 40px;
        right: 16px;
        top: 75px;
    }
}