:root {
    --primary-color: #1D1D1F;
    --secondary-color: #86868B;
    --accent-color: #0071E3;
    --accent-hover: #0077ED;
    --bg-light: #F5F5F7;
    --bg-white: #FFFFFF;
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --border-color: #E5E5E7;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-weight: 400;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-white);
}

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

ul {
    list-style: none;
}

button {
    cursor: pointer;
    border: none;
    outline: none;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 500;
    border-radius: 20px;
    transition: all var(--transition-fast);
    letter-spacing: 0.02em;
}

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

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

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

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

.btn-full {
    width: 100%;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    transition: all var(--transition-normal);
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
}

.header.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-sm);
}

.nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 14px;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 12px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 1px;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    padding: 8px;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 1px;
    transition: all var(--transition-fast);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 24px;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #F5F5F7 0%, #FFFFFF 50%, #F5F5F7 100%);
}

.hero-content {
    max-width: 600px;
    text-align: center;
    z-index: 2;
}

.hero-subtitle {
    font-size: 14px;
    font-weight: 500;
    color: var(--accent-color);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 16px;
    animation: fadeInUp 0.8s ease forwards;
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
    animation: fadeInUp 0.8s ease 0.1s forwards;
    opacity: 0;
}

.hero-description {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    animation: fadeInUp 0.8s ease 0.2s forwards;
    opacity: 0;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    animation: fadeInUp 0.8s ease 0.3s forwards;
    opacity: 0;
}

.hero-visual {
    position: absolute;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.floating-card {
    position: absolute;
    border-radius: 20px;
    background: white;
    box-shadow: var(--shadow-lg);
    animation: float 6s ease-in-out infinite;
}

.card-1 {
    width: 200px;
    height: 280px;
    top: 20%;
    right: 15%;
    animation-delay: 0s;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.card-2 {
    width: 180px;
    height: 240px;
    bottom: 25%;
    left: 10%;
    animation-delay: -2s;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.card-3 {
    width: 160px;
    height: 200px;
    top: 50%;
    right: 30%;
    animation-delay: -4s;
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

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

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-30px) rotate(2deg);
    }
}

.works,
.about,
.contact {
    padding: 100px 24px;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-subtitle {
    font-size: 12px;
    font-weight: 500;
    color: var(--accent-color);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.section-title {
    font-size: 40px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.filter-tabs {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 48px;
}

.filter-tab {
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    transition: all var(--transition-fast);
}

.filter-tab:hover {
    border-color: var(--text-secondary);
    color: var(--text-primary);
}

.filter-tab.active {
    background-color: var(--text-primary);
    color: white;
    border-color: var(--text-primary);
}

.works-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.work-card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.work-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.work-image {
    position: relative;
    overflow: hidden;
}

.work-image img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.work-card:hover .work-image img {
    transform: scale(1.05);
}

.work-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.work-card:hover .work-overlay {
    opacity: 1;
}

.work-view {
    padding: 12px 32px;
    font-size: 14px;
    font-weight: 500;
    color: white;
    background: var(--accent-color);
    border-radius: 20px;
    transition: all var(--transition-fast);
}

.work-view:hover {
    background: var(--accent-hover);
}

.work-info {
    padding: 20px;
}

.work-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.work-category {
    font-size: 14px;
    color: var(--text-secondary);
}

.about-content {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 64px;
    align-items: center;
}

.about-image {
    position: relative;
}

.image-wrapper {
    position: relative;
    width: 320px;
    height: 320px;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.image-wrapper::before {
    content: '';
    position: absolute;
    inset: -10px;
    background: linear-gradient(135deg, var(--accent-color) 0%, transparent 50%);
    border-radius: 50%;
    z-index: -1;
}

.about-text {
    padding: 24px 0;
}

.about-description {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.8;
}

.skills {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 32px;
}

.skill-tag {
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-light);
    border-radius: 16px;
    transition: all var(--transition-fast);
}

.skill-tag:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

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

.contact-content {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
}

.contact-info {
    padding: 24px 0;
}

.contact-description {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 40px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 16px;
    color: var(--text-secondary);
}

.contact-item i {
    width: 20px;
    color: var(--accent-color);
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-link {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.social-link:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.social-link i {
    color: var(--text-secondary);
    font-size: 18px;
}

.social-link:hover i {
    color: var(--accent-color);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 16px;
    font-size: 14px;
    font-family: inherit;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: all var(--transition-fast);
    outline: none;
}

.form-input:focus,
.form-textarea:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-secondary);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.footer {
    padding: 32px 24px;
    text-align: center;
    background: var(--text-primary);
    color: var(--text-secondary);
    font-size: 13px;
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        transition: all var(--transition-normal);
        pointer-events: none;
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .menu-toggle {
        display: flex;
    }

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

    .hero-description {
        font-size: 16px;
    }

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

    .floating-card {
        display: none;
    }

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

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

    .about-content {
        grid-template-columns: 1fr;
        gap: 48px;
        text-align: center;
    }

    .image-wrapper {
        margin: 0 auto;
    }

    .skills {
        justify-content: center;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }
}