/* Modern Developer Portfolio CSS */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
    --bg-base: #060913;
    --bg-surface: #0f1523;
    --bg-surface-elevated: #1a2235;
    
    --accent-blue: #0ea5e9;
    --accent-blue-hover: #38bdf8;
    --accent-purple: #8b5cf6;
    
    --text-primary: #f8fafc;
    --text-sec: #94a3b8;
    --text-mute: #64748b;
    
    --border-light: rgba(255, 255, 255, 0.08);
    --border-medium: rgba(255, 255, 255, 0.12);
    
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(14, 165, 233, 0.15);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
}

/* Base Reset & Typography */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    position: relative;
}

/* Animated Mesh Gradient Background */
.background-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background-color: var(--bg-base);
    overflow: hidden;
}
.background-wrapper::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -20%;
    width: 80%;
    height: 100%;
    background: radial-gradient(circle, rgba(14,165,233,0.1) 0%, transparent 60%);
    filter: blur(80px);
    animation: pulse 10s ease-in-out infinite alternate;
}
.background-wrapper::after {
    content: '';
    position: absolute;
    bottom: -50%;
    right: -20%;
    width: 80%;
    height: 100%;
    background: radial-gradient(circle, rgba(139,92,246,0.1) 0%, transparent 60%);
    filter: blur(80px);
    animation: pulse 12s ease-in-out infinite alternate-reverse;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.5; }
    100% { transform: scale(1.1); opacity: 1; }
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Container & Sections */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 8rem 0;
    position: relative;
}

.section-heading {
    margin-bottom: 3.5rem;
    position: relative;
    text-align: center;
}

.section-heading.left {
    text-align: left;
}

.section-heading h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #fff 0%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

/* Gradient Text Accent */
.text-gradient {
    background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-subtitle {
    color: var(--text-sec);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

.section-heading.left .section-subtitle {
    margin: 0;
}

/* Header & Glassmorphism Navigation */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(6, 9, 19, 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-light);
    transition: transform 0.3s ease, background 0.3s ease;
}

.site-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 5rem;
    padding: 0 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.brand a {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.brand span {
    color: var(--accent-blue);
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-sec);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0%;
    height: 2px;
    background: var(--accent-blue);
    transition: width var(--transition-normal);
    border-radius: 2px;
}

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

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

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 6px;
    z-index: 1001;
}

.nav-toggle-bar {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: all 0.3s ease;
    border-radius: 2px;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 5rem;
}

.hero-content {
    max-width: 800px;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1rem;
    background: rgba(14, 165, 233, 0.1);
    border: 1px solid rgba(14, 165, 233, 0.2);
    border-radius: var(--radius-full);
    color: var(--accent-blue);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.875rem;
    letter-spacing: 0.05em;
    margin-bottom: 2rem;
    text-transform: uppercase;
}

.hero h1 {
    font-size: clamp(3rem, 6vw, 5rem);
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.25rem);
    color: var(--text-sec);
    margin-bottom: 3rem;
    max-width: 650px;
    line-height: 1.7;
}

.hero-ctas {
    display: flex;
    gap: 1.25rem;
    flex-wrap: wrap;
    margin-bottom: 3rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    border-radius: var(--radius-full);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn.primary {
    background: var(--accent-blue);
    color: #fff;
    border: none;
    box-shadow: 0 8px 16px rgba(14, 165, 233, 0.25);
}

.btn.primary:hover {
    background: var(--accent-blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 12px 20px rgba(14, 165, 233, 0.35);
}

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

.btn.secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.quick-info {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    list-style: none;
    border-top: 1px solid var(--border-light);
    padding-top: 2rem;
}

.quick-info li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-sec);
    font-size: 0.95rem;
}

.quick-info a {
    color: var(--text-primary);
    font-weight: 500;
}
.quick-info a:hover {
    color: var(--accent-blue);
}

.quick-info i {
    font-size: 1.2rem;
    color: var(--accent-blue);
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text p {
    color: var(--text-sec);
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
}

/* Education Cards */
.edu-grid {
    display: grid;
    gap: 2rem;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

.card {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(135deg, rgba(255,255,255,0.03) 0%, transparent 100%);
    z-index: -1;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

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

.card:hover::before {
    opacity: 1;
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.card p {
    color: var(--text-sec);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.card .item-meta {
    font-family: var(--font-heading);
    color: var(--accent-blue);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
    display: block;
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.skill-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    transition: all var(--transition-normal);
}

.skill-card:hover {
    transform: translateY(-5px);
    border-color: rgba(139, 92, 246, 0.4); /* Purple accent on hover */
    box-shadow: var(--shadow-lg);
}

.skill-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-light);
    padding-bottom: 1rem;
}

.badge-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    list-style: none;
}

.skill-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.skill-badge:hover {
    background: rgba(14, 165, 233, 0.1);
    border-color: rgba(14, 165, 233, 0.3);
    color: var(--accent-blue);
    transform: translateY(-2px);
}

.skill-badge i {
    font-size: 1.2rem;
}

.skill-icon {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.75rem;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

/* Projects Layout */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2.5rem;
}

.project-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
    overflow: hidden;
}

.project-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.project-card:hover {
    transform: translateY(-8px);
    border-color: rgba(14, 165, 233, 0.3);
    box-shadow: 0 20px 40px -10px rgba(0,0,0,0.8), 0 0 30px rgba(14,165,233,0.1);
}

.project-card:hover::after {
    opacity: 1;
}

.project-top {
    margin-bottom: 1.5rem;
}

.project-top h3 {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
}

.project-top a {
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.project-top a::after {
    content: '↗';
    font-size: 1.1rem;
    opacity: 0;
    transform: translateX(-10px);
    transition: all var(--transition-normal);
    color: var(--accent-blue);
}

.project-card:hover .project-top a {
    color: var(--accent-blue);
}

.project-card:hover .project-top a::after {
    opacity: 1;
    transform: translateX(0);
}

.project-meta {
    font-size: 0.85rem;
    color: var(--accent-purple);
    font-family: var(--font-heading);
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.project-card ul {
    list-style: none;
    color: var(--text-sec);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: auto; /* push tags down */
}

.project-card ul li {
    font-size: 0.95rem;
    position: relative;
    padding-left: 1.5rem;
}

.project-card ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-blue);
    font-size: 1.2rem;
    line-height: 1;
}

/* Certifications */
.cert-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: center;
}

.cert-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: 50%;
    font-size: 2rem;
    color: var(--text-primary);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.cert-icon:hover {
    transform: translateY(-8px) scale(1.05);
    background: rgba(14, 165, 233, 0.1);
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    box-shadow: 0 10px 20px rgba(14, 165, 233, 0.2);
}

.cert-icon.primary {
    width: 100px;
    height: 100px;
    font-size: 2.5rem;
    background: rgba(14, 165, 233, 0.05);
    border-color: rgba(14, 165, 233, 0.3);
}

.cert-letter {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.25rem;
}

/* Achievements */
.achievements-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.list-highlight {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.list-highlight li {
    position: relative;
    padding-left: 2rem;
    color: var(--text-sec);
    font-size: 1.05rem;
}

.list-highlight li::before {
    content: '→';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--accent-blue);
    font-weight: bold;
}

.achievements-box {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
}

.achievements-box h3 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-size: 1.4rem;
}

/* Contact Section */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.contact-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 3rem 2.5rem;
    text-align: center;
    transition: all var(--transition-normal);
}

.contact-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-blue);
    box-shadow: var(--shadow-md);
}

.contact-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.contact-card a {
    color: var(--text-sec);
    font-size: 1.125rem;
}

.contact-card a:hover {
    color: var(--accent-blue);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1rem;
}

.social-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-light);
    border-radius: 50%;
    font-size: 1.25rem;
    color: var(--text-primary);
    transition: all var(--transition-normal);
}

.social-icon:hover {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    transform: translateY(-5px);
    color: #fff;
    box-shadow: 0 10px 20px rgba(14, 165, 233, 0.3);
}

/* Footer */
.site-footer {
    padding: 3rem 0;
    border-top: 1px solid var(--border-light);
    background: var(--bg-surface);
    text-align: center;
}

.site-footer p {
    color: var(--text-mute);
    font-size: 0.95rem;
}

/* Back to Top */
.to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-light);
    color: var(--text-primary);
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 99;
    box-shadow: var(--shadow-md);
}

.to-top.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.to-top:hover {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    transform: translateY(-5px);
}

/* Scroll Reveal Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.5, 0, 0, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Utilities */
.text-center { text-align: center; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}
.skip-link {
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-blue);
    color: #fff;
    padding: 1rem 2rem;
    z-index: 2000;
    border-radius: var(--radius-full);
}
.skip-link:focus {
    top: 2rem;
}

/* Media Queries */
@media (max-width: 1024px) {
    .about-grid, .achievements-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    .nav-toggle { display: flex; }
    
    .nav-links {
        position: fixed;
        top: 5rem;
        left: 0;
        width: 100%;
        background: rgba(6, 9, 19, 0.95);
        backdrop-filter: blur(16px);
        flex-direction: column;
        align-items: center;
        padding: 2rem 0;
        gap: 1.5rem;
        border-bottom: 1px solid var(--border-light);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all 0.3s ease;
    }

    .nav-links.is-open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
        opacity: 0;
    }
    .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .hero {
        padding-top: 6rem;
        text-align: center;
    }
    .hero-content {
        margin: 0 auto;
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    .hero-ctas {
        justify-content: center;
    }
    .quick-info {
        justify-content: center;
    }
    
    .section {
        padding: 5rem 0;
    }

    .section-heading.left {
        text-align: center;
    }
}