:root {
    --primary-color: #007AFF;
    --primary-dark: #005ECC;
    --primary-light: #339CFF;
    --text-color: #1D1D1F;
    --text-light: #6A6A6F;
    --background-color: #F5F5F7;
    --secondary-background: #FFFFFF;
    --card-background: rgba(255, 255, 255, 0.9);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --gradient-primary: linear-gradient(135deg, #007AFF 0%, #339CFF 100%);
    --gradient-dark: linear-gradient(135deg, #1D1D1F 0%, #434344 100%);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.15);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    letter-spacing: -0.5px;
}

.logo span {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
    font-size: 0.95rem;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition);
}

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 6rem 0;
    background: linear-gradient(135deg, var(--background-color) 0%, var(--secondary-background) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23007AFF' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.8;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    background: var(--gradient-dark);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -1px;
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Social Links */
.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.social-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    border-radius: 12px;
    background: var(--secondary-background);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.social-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: var(--card-background);
}

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

/* Sections */
.section {
    padding: 8rem 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 4rem;
    background: var(--gradient-dark);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

/* Cards */
.card {
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.08);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
    margin-top: 2rem;
}

.project-card {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.project-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.project-header i {
    font-size: 1.75rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.project-header h3 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin: 1.5rem 0;
}

.tech-tag {
    background: rgba(0, 122, 255, 0.1);
    color: var(--primary-color);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.project-links {
    display: flex;
    gap: 1rem;
    margin-top: auto;
    padding-top: 1.5rem;
}

.project-links .btn {
    flex: 1;
    width: 100%;
    justify-content: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    border-radius: 12px;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background: rgba(0, 122, 255, 0.1);
    transform: translateY(-2px);
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2.5rem;
}

.skill-card {
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.skill-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.skill-list {
    list-style: none;
}

.skill-list li {
    margin-bottom: 0.75rem;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.skill-list li::before {
    content: '▹';
    color: var(--primary-color);
}

/* Footer */
.footer {
    background: var(--background-color);
    padding: 2rem 0;
    text-align: center;
    color: var(--text-light);
    font-size: 0.9rem;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

/* Loading Animation */
.loading-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--background-color);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

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

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(0, 122, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.loading-subtext {
    color: var(--text-light);
    font-size: 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }

    .nav-links {
        display: none;
    }

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

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

    .btn {
        width: 100%;
        justify-content: center;
    }

    .section {
        padding: 4rem 0;
    }

    .section-title {
        font-size: 2rem;
        margin-bottom: 2rem;
    }
}