/* =====================
   CSS RESET & BASE STYLES
   ===================== */

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

:root {
    /* Color Palette */
    --color-bg: #FDFBF7;           /* Warm cream background */
    --color-text: #2C3E50;          /* Dark blue-gray for text */
    --color-text-light: #5A6C7D;    /* Lighter text for descriptions */
    --color-primary: #2563EB;       /* Blue for primary actions */
    --color-primary-hover: #1E40AF; /* Darker blue on hover */
    --color-secondary: #10B981;     /* Green for sustainability/accent */
    --color-secondary-hover: #059669;
    --color-border: #E5E7EB;        /* Light border */
    --color-card-bg: #FFFFFF;       /* White for cards */
    --color-shadow: rgba(0, 0, 0, 0.08);
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 48px;
    --spacing-xl: 64px;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-bg);
}

/* Container - centers content with max width */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* =====================
   NAVIGATION BAR
   ===================== */

.navbar {
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.logo:hover {
    color: var(--color-primary);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-links a {
    color: var(--color-text-light);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-links a:hover {
    color: var(--color-primary);
}

/* =====================
   HERO SECTION
   ===================== */

.hero {
    padding: var(--spacing-xl) 0;
    min-height: 80vh;
    display: flex;
    align-items: center;
}

.hero-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.hero-text h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.subtitle {
    font-size: 1.25rem;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.description {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* Button Styles */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-normal);
    cursor: pointer;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

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

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

/* Profile Image */
.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.profile-img {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 32px var(--color-shadow);
    transition: transform var(--transition-normal);
}

.profile-img:hover {
    transform: scale(1.02);
}

/* =====================
   ABOUT SECTION
   ===================== */

.about {
    padding: var(--spacing-xl) 0;
    background-color: white;
}

.about h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.about-content p {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.achievements {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.achievement-item {
    background-color: var(--color-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
}

.achievement-item h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.achievement-item p {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin: 0;
}

/* =====================
   PROJECTS SECTION
   ===================== */

.projects {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-bg);
}

.projects h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.project-card {
    background-color: var(--color-card-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: 0 2px 8px var(--color-shadow);
    transition: all var(--transition-normal);
    position: relative;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--color-shadow);
}

.project-card.featured {
    border: 2px solid var(--color-secondary);
    background: linear-gradient(to bottom, rgba(16, 185, 129, 0.05), white);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
}

.project-header h3 {
    font-size: 1.5rem;
    color: var(--color-text);
    margin: 0;
    flex: 1;
}

.project-links {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

.icon-link {
    color: var(--color-text-light);
    transition: color var(--transition-fast);
}

.icon-link:hover {
    color: var(--color-primary);
}

.demo-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.demo-link:hover {
    color: var(--color-primary-hover);
}

.award-badge {
    display: inline-block;
    background-color: var(--color-secondary);
    color: white;
    padding: 4px 12px;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.project-description {
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tech-tag {
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--color-primary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
}

.tech-tag.tech-green {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--color-secondary);
}

/* =====================
   SKILLS SECTION
   ===================== */

.skills {
    padding: var(--spacing-xl) 0;
    background-color: white;
}

.skills h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.skill-category {
    background-color: var(--color-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-top: 3px solid var(--color-primary);
}

.skill-category h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.skill-tag {
    background-color: white;
    color: var(--color-text);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
}

.skill-tag:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
}

/* =====================
   CONTACT SECTION
   ===================== */

.contact {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-bg);
}

.contact h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.contact-description {
    text-align: center;
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
}

.contact-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    max-width: 900px;
    margin: 0 auto;
}

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    background-color: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--color-text);
    transition: all var(--transition-normal);
    border: 2px solid var(--color-border);
}

.contact-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--color-shadow);
}

.contact-card svg {
    color: var(--color-primary);
}

.contact-card span {
    font-weight: 600;
}

/* =====================
   FOOTER
   ===================== */

.footer {
    background-color: white;
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    text-align: center;
}

.footer p {
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* =====================
   RESPONSIVE DESIGN
   ===================== */

/* Tablet breakpoint */
@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-text h1 {
        font-size: 2.5rem;
    }
    
    .description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .cta-buttons {
        justify-content: center;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .achievements {
        grid-template-columns: 1fr;
    }
    
    .contact-links {
        grid-template-columns: 1fr;
    }
}

/* Mobile breakpoint */
@media (max-width: 480px) {
    :root {
        --spacing-lg: 32px;
        --spacing-xl: 48px;
    }
    
    .hero-text h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1.125rem;
    }
    
    .description {
        font-size: 1rem;
    }
    
    .nav-links {
        gap: var(--spacing-sm);
        font-size: 0.9rem;
    }
    
    .about h2,
    .projects h2,
    .skills h2,
    .contact h2 {
        font-size: 2rem;
    }
}