:root {
            --sf-pro: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --primary-bg: #ffffff;
            --secondary-bg: #f5f5f7;
            --card-bg: #ffffff;
            --text-primary: #1d1d1f;
            --text-secondary: #6e6e73;
            --accent: #0071e3;
            --accent-hover: #0077ed;
            --border: rgba(0, 0, 0, 0.1);
            --shadow: rgba(0, 0, 0, 0.08);
            --nav-bg: rgba(255, 255, 255, 0.8);
        }

        [data-theme="dark"] {
            --primary-bg: #000000;
            --secondary-bg: #161616;
            --card-bg: #1d1d1f;
            --text-primary: #f5f5f7;
            --text-secondary: #a1a1a6;
            --accent: #2997ff;
            --accent-hover: #409cff;
            --border: rgba(255, 255, 255, 0.15);
            --shadow: rgba(0, 0, 0, 0.3);
            --nav-bg: rgba(29, 29, 31, 0.8);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--sf-pro);
            background: var(--primary-bg);
            color: var(--text-primary);
            line-height: 1.6;
            transition: background 0.3s ease, color 0.3s ease;
        }

        .nav-bar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: var(--nav-bg);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border);
            z-index: 1000;
            transition: all 0.3s ease;
        }

        .nav-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 22px;
            height: 48px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo-section {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .logo {
            width: 32px;
            height: 32px;
            border-radius: 8px;
            background: linear-gradient(135deg, #0071e3, #2997ff);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 14px;
            color: #ffffff;
        }

        .nav-title {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
        }

        .nav-controls {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .theme-toggle {
            width: 32px;
            height: 32px;
            border: none;
            background: transparent;
            color: var(--text-primary);
            cursor: pointer;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background 0.2s ease;
            font-size: 18px;
        }

        .theme-toggle:hover {
            background: var(--secondary-bg);
        }

        .lang-select {
            background: transparent;
            color: var(--text-primary);
            border: 1px solid var(--border);
            padding: 4px 8px;
            border-radius: 8px;
            font-size: 12px;
            font-family: var(--sf-pro);
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .lang-select:hover {
            border-color: var(--accent);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 88px 22px 60px;
        }

        .hero-section {
            display: grid;
            grid-template-columns: 1fr 400px;
            gap: 60px;
            align-items: center;
            padding: 210px 0 210px;
        }

        .hero-content {
            text-align: left;
        }

        .hero-title {
            font-size: 56px;
            font-weight: 700;
            letter-spacing: -0.02em;
            margin-bottom: 8px;
            line-height: 1.07;
        }

        .hero-subtitle {
            font-size: 28px;
            font-weight: 400;
            color: var(--text-secondary);
            margin-bottom: 24px;
        }

        .hero-desc {
            font-size: 21px;
            font-weight: 400;
            color: var(--text-secondary);
            margin-bottom: 40px;
            line-height: 1.38;
        }

        .cta-buttons {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-block;
            padding: 12px 24px;
            border-radius: 980px;
            font-size: 17px;
            font-weight: 400;
            text-decoration: none;
            transition: all 0.2s ease;
            border: none;
            cursor: pointer;
        }

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

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

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

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

        .profile-container {
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .profile-image {
            width: 100%;
            max-width: 400px;
            height: auto;
            aspect-ratio: 1;
            border-radius: 20px;
            object-fit: cover;
            box-shadow: 0 20px 60px var(--shadow);
        }

        .section {
            margin: 80px 0;
        }

        .section-title {
            font-size: 40px;
            font-weight: 700;
            text-align: center;
            margin-bottom: 48px;
            letter-spacing: -0.01em;
        }

        .card {
            background: var(--card-bg);
            border-radius: 18px;
            padding: 40px;
            box-shadow: 0 4px 20px var(--shadow);
            border: 1px solid var(--border);
            transition: all 0.3s ease;
            margin-bottom: 24px;
        }

        .card:hover {
            box-shadow: 0 8px 30px var(--shadow);
            transform: translateY(-2px);
        }

        .card-title {
            font-size: 28px;
            font-weight: 600;
            margin-bottom: 20px;
        }

        .card-text {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.47;
            margin-bottom: 16px;
        }

        .cards-stack {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }

        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
            margin-top: 24px;
        }

        .grid-4 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }

        .project-card {
            background: var(--secondary-bg);
            border-radius: 12px;
            padding: 24px;
            transition: all 0.2s ease;
        }

        .project-card:hover {
            background: var(--card-bg);
            box-shadow: 0 4px 15px var(--shadow);
        }

        .project-title {
            font-size: 19px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .project-desc {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.4;
        }

        .skill-bars {
            margin-top: 24px;
        }

        .skill-item {
            margin-bottom: 20px;
        }

        .skill-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 8px;
            font-size: 15px;
        }

        .skill-name {
            font-weight: 500;
        }

        .skill-percent {
            color: var(--text-secondary);
        }

        .skill-bar-bg {
            height: 6px;
            background: var(--secondary-bg);
            border-radius: 3px;
            overflow: hidden;
        }

        .skill-bar-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--accent), #2997ff);
            border-radius: 3px;
            transition: width 1s ease;
        }

        .chart-container {
            margin-top: 24px;
        }

        .contact-section {
            text-align: center;
        }

        .contact-title {
            font-size: 40px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .contact-text {
            font-size: 21px;
            color: var(--text-secondary);
            margin-bottom: 12px;
            line-height: 1.38;
        }

        .contact-links {
            margin-top: 32px;
            display: flex;
            flex-direction: column;
            gap: 16px;
            align-items: center;
        }

        .contact-link {
            font-size: 17px;
            color: var(--accent);
            text-decoration: none;
            transition: color 0.2s ease;
        }

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

        .footer {
            text-align: center;
            padding: 40px 0;
            color: var(--text-secondary);
            font-size: 14px;
            border-top: 1px solid var(--border);
        }

        @media (max-width: 968px) {
            .hero-section {
                grid-template-columns: 1fr;
                gap: 40px;
                padding: 60px 0 80px
            }

            .hero-content {
                text-align: center;
            }

            .cta-buttons {
                justify-content: center;
            }

            .profile-image {
                max-width: 400px;
            }
        }

        @media (max-width: 768px) {
            .hero-title {
                font-size: 40px;
            }

            .hero-subtitle {
                font-size: 24px;
            }

            .hero-desc {
                font-size: 19px;
            }

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

            .grid-2, .grid-4 {
                grid-template-columns: 1fr;
            }

            .profile-image {
                max-width: 400px;
            }

            .card {
                padding: 28px;
            }
        }

        @media (max-width: 480px) {
            .hero-title {
                font-size: 32px;
            }

            .hero-subtitle {
                font-size: 20px;
            }

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

            .cta-buttons {
                flex-direction: column;
                width: 100%;
            }

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

            .profile-image {
                max-width: 400px;
            }
        }

/* Contact Form Styles - Apple Design */
.contact-form {
    max-width: 600px;
    margin: 40px auto 32px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    font-size: 17px;
    font-family: var(--sf-pro);
    color: var(--text-primary);
    background: var(--secondary-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    transition: all 0.2s ease;
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    background: var(--card-bg);
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(41, 151, 255, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.form-group textarea {
    min-height: 140px;
    resize: vertical;
    line-height: 1.5;
}

.submit-button {
    width: 100%;
    padding: 14px 24px;
    font-size: 17px;
    font-weight: 500;
    font-family: var(--sf-pro);
    color: #ffffff;
    background: var(--accent);
    border: none;
    border-radius: 980px;
    cursor: pointer;
    transition: all 0.2s ease;
    letter-spacing: -0.01em;
}

.submit-button:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(41, 151, 255, 0.3);
}

.submit-button:active {
    transform: translateY(0);
}

.success-message {
    display: none;
    padding: 16px 20px;
    margin-bottom: 24px;
    background: rgba(52, 199, 89, 0.1);
    border: 1px solid rgba(52, 199, 89, 0.3);
    border-radius: 12px;
    color: #34c759;
    font-size: 15px;
    font-weight: 500;
    text-align: center;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Dark theme adjustments */
[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group textarea {
    background: var(--secondary-bg);
}

[data-theme="dark"] .form-group input:focus,
[data-theme="dark"] .form-group textarea:focus {
    background: var(--card-bg);
}

/* Responsive design */
@media (max-width: 768px) {
    .contact-form {
        margin: 32px auto 24px;
    }

    .form-group {
        margin-bottom: 20px;
    }

    .form-group input,
    .form-group textarea {
        padding: 12px 14px;
        font-size: 16px;
    }

    .submit-button {
        padding: 12px 20px;
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .form-group label {
        font-size: 14px;
    }

    .form-group input,
    .form-group textarea {
        padding: 11px 13px;
        font-size: 16px;
    }

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