/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #3b82f6;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-card: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --border-radius: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    font-size: 16px;
}

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

/* Language Toggle */
.language-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.lang-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 60px 0;
    margin-bottom: 40px;
}

.header-content {
    display: flex;
    align-items: center;
    gap: 40px;
}

.profile-info {
    flex: 1;
}

.name {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.025em;
}

.title {
    font-size: 1.5rem;
    font-weight: 400;
    opacity: 0.9;
    margin-bottom: 24px;
}

.contact-info {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: white;
    text-decoration: none;
    font-weight: 400;
    transition: var(--transition);
}

.contact-item:hover {
    opacity: 0.8;
    transform: translateY(-1px);
}

.contact-item i {
    width: 16px;
    text-align: center;
}

/* Main Content */
.main {
    margin-bottom: 60px;
}

.section {
    margin-bottom: 48px;
}

.section-title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 32px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary-color);
}

.section-title i {
    color: var(--primary-color);
}

/* Projects */
.projects-container {
    display: grid;
    gap: 32px;
}

.project-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 32px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.project-header {
    margin-bottom: 20px;
}

.project-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    line-height: 1.3;
}

.project-title a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

.project-title a:hover {
    color: var(--primary-color);
}

.project-period {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
    background: var(--bg-secondary);
    padding: 4px 12px;
    border-radius: 20px;
    display: inline-block;
}

.project-description {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.7;
}

.project-section {
    margin-bottom: 24px;
}

.project-section:last-child {
    margin-bottom: 0;
}

.project-section-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.project-section-title::before {
    content: '';
    width: 4px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 2px;
}

.project-list {
    list-style: none;
    padding: 0;
}

.project-list li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 8px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.project-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    text-align: center;
    padding: 24px 0;
    margin-top: 60px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
    
    .name {
        font-size: 2.5rem;
    }
    
    .title {
        font-size: 1.25rem;
    }
    
    .contact-info {
        flex-direction: column;
        gap: 12px;
    }
    
    .project-card {
        padding: 24px;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .language-toggle {
        top: 16px;
        right: 16px;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 40px 0;
    }
    
    .name {
        font-size: 2rem;
    }
    
    .project-card {
        padding: 20px;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Loading State */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 200px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}