/* Import Google Font - Inter with more weights */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

:root {
    --primary-color: #3B82F6;
    --primary-dark: #2563EB;
    --primary-light: #60A5FA;
    --secondary-color: #64748B;
    --accent-color: #10B981;
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-light: #9CA3AF;
    --background-primary: #FFFFFF;
    --background-secondary: #F8FAFC;
    --background-dark: #1E293B;
    --card-background: #FFFFFF;
    --border-color: #E5E7EB;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--background-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

header.container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    flex-wrap: wrap;
}

.logo {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

/* Navigation */
header nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
    align-items: center;
}

header nav ul li a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    position: relative;
    padding: 0.5rem 0;
}

header nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

header nav ul li a:hover::after {
    width: 100%;
}

header nav ul li a:hover {
    color: var(--primary-color);
    transform: translateY(-1px);
}

/* Language Switcher */
.language-switcher {
    display: flex;
    gap: 0.5rem;
    background: var(--background-secondary);
    padding: 0.25rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
}

.language-switcher button {
    background: transparent;
    color: var(--text-secondary);
    border: none;
    padding: 0.5rem 1rem;
    cursor: pointer;
    border-radius: 0.5rem;
    font-weight: 500;
    font-size: 0.875rem;
    transition: all 0.3s ease;
}

.language-switcher button:hover {
    color: var(--text-primary);
    background: rgba(59, 130, 246, 0.1);
}

.language-switcher button.active {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-md);
}

/* Hero Section */
.hero {
    background: var(--gradient-primary);
    color: white;
    padding: 8rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.hero .container {
    position: relative;
    z-index: 2;
}

.hero h2 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.hero p {
    font-size: clamp(1.125rem, 2vw, 1.25rem);
    max-width: 800px;
    margin: 0 auto;
    opacity: 0.95;
    font-weight: 400;
    line-height: 1.6;
}

/* Section Styles */
section {
    padding: 6rem 0;
}

section:nth-of-type(even) {
    background: var(--background-secondary);
}

/* Section Headers */
h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-primary);
    position: relative;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 4rem;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

/* Project Items */
.project-item {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-md);
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.project-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.project-item:hover::before {
    transform: scaleX(1);
}

.project-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.project-item h3 {
    color: var(--primary-color);
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.project-item p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.7;
    margin-bottom: 1rem;
}

.project-item p strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Project Visual Placeholder */
.project-visual-placeholder {
    background: var(--background-secondary);
    height: 200px;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-style: italic;
    margin-top: 2rem;
    border: 2px dashed var(--border-color);
    transition: all 0.3s ease;
}

.project-item:hover .project-visual-placeholder {
    border-color: var(--primary-light);
    background: rgba(59, 130, 246, 0.05);
}

/* Skills Section */
.skill-category {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.skill-category::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.1), transparent);
    transition: left 0.5s ease;
}

.skill-category:hover::before {
    left: 100%;
}

.skill-category:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.skill-category h3 {
    color: var(--primary-color);
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.skill-category p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
    margin: 0;
}

/* Contact Section */
.contact p {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.contact a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    position: relative;
}

.contact a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

.contact a:hover::after {
    width: 100%;
}

.contact a:hover {
    color: var(--primary-dark);
}

.contact i {
    color: var(--primary-color);
    font-size: 1.2rem;
}

/* Footer */
footer {
    background: var(--background-dark);
    color: white;
    text-align: center;
    padding: 3rem 0;
    margin-top: 4rem;
}

footer p {
    font-size: 0.95rem;
    opacity: 0.8;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.project-item,
.skill-category {
    animation: fadeInUp 0.6s ease forwards;
}

/* Responsive Design */
@media (max-width: 768px) {
    header.container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    header nav ul {
        flex-direction: column;
        gap: 1rem;
    }

    .hero {
        padding: 6rem 0;
    }

    .project-item {
        padding: 2rem;
    }

    section {
        padding: 4rem 0;
    }

    .container {
        width: 95%;
        padding: 0 15px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 4rem 0;
    }

    .project-item {
        padding: 1.5rem;
    }

    .skill-category {
        padding: 1.5rem;
    }

    .language-switcher button {
        padding: 0.375rem 0.75rem;
        font-size: 0.8rem;
    }
}

/* Smooth scrolling for anchor links */
html {
    scroll-behavior: smooth;
}

/* Focus styles for accessibility */
button:focus,
a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Loading animation for images */
img {
    transition: opacity 0.3s ease;
}

img[loading] {
    opacity: 0;
}

img.loaded {
    opacity: 1;
}