/* =============================================
   Professional Portfolio Stylesheet 
   Author: Enterprise Web Development
   ============================================= */

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

html {
    scroll-behavior: smooth;
}

:root {
    /* Light Theme (Default) */
    --color-bg: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-text: #1a1a1a;
    --color-text-light: #555555;
    --color-border: #e0e0e0;
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-accent: #14b8a6;
    --color-success: #10b981;
    --color-error: #ef4444;
    
    /* Dark Theme */
    --color-bg-dark: #0f172a;
    --color-bg-dark-secondary: #1e293b;
    --color-text-dark: #f1f5f9;
    --color-text-dark-light: #cbd5e1;
    --color-border-dark: #334155;
}

html[data-theme="dark"] {
    --color-bg: var(--color-bg-dark);
    --color-bg-secondary: var(--color-bg-dark-secondary);
    --color-text: var(--color-text-dark);
    --color-text-light: var(--color-text-dark-light);
    --color-border: var(--color-border-dark);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

/* ============= TYPOGRAPHY ============= */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

p {
    margin-bottom: 1rem;
    color: var(--color-text-light);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* ============= NAVBAR ============= */
.navbar {
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

html[data-theme="dark"] .navbar {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: 2px;
}

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

.nav-link {
    color: var(--color-text);
    font-weight: 500;
    position: relative;
    transition: color 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
}

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

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--color-text);
    border-radius: 3px;
    transition: all 0.3s ease;
}

.theme-toggle {
    background: none;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background: var(--color-primary);
    color: white;
    transform: rotate(20deg);
}

/* ============= BUTTONS ============= */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(99, 102, 241, 0.3);
}

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

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

/* ============= HERO SECTION ============= */
.hero {
    padding: 6rem 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(20, 184, 166, 0.1));
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-left h1 {
    font-size: 3.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.description {
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.social-links {
    display: flex;
    gap: 1.5rem;
}

.social-links a {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    border: 2px solid var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-5px);
}

.profile-box {
    position: relative;
    width: 300px;
    height: 300px;
    margin: 0 auto;
}

.profile-box {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(99, 102, 241, 0.2);
}

.profile-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    animation: profileFloat 3s ease-in-out infinite;
}

@keyframes profileFloat {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* ============= ABOUT SECTION ============= */
.about {
    padding: 6rem 0;
}

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

.about-text p {
    margin-bottom: 1.5rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-item h3 {
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.stat-item p {
    color: var(--color-text-light);
    margin: 0;
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.highlight-card {
    background: var(--color-bg-secondary);
    padding: 2rem;
    border-radius: 12px;
    border-left: 4px solid var(--color-primary);
    transition: all 0.3s ease;
}

.highlight-card:hover {
    transform: translateX(10px);
    box-shadow: 0 10px 25px rgba(99, 102, 241, 0.15);
}

.highlight-card i {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.highlight-card h3 {
    margin-bottom: 0.5rem;
}

/* ============= SKILLS SECTION ============= */
.skills {
    padding: 6rem 0;
    background: var(--color-bg-secondary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.skill-card {
    background: var(--color-bg);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid var(--color-border);
}

.skill-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.2);
}

.skill-card i {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.skill-card h3 {
    margin-bottom: 1rem;
}

.skill-card p {
    font-size: 0.95rem;
    margin: 0;
}

/* ============= PROJECTS SECTION ============= */
.projects {
    padding: 6rem 0;
}

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

.project-card {
    background: var(--color-bg-secondary);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.2);
    border-color: var(--color-primary);
}

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

.project-top i {
    font-size: 2rem;
    color: var(--color-primary);
}

.project-top h3 {
    margin: 0;
}

.project-meta {
    font-size: 0.9rem;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.project-card p {
    flex: 1;
    margin-bottom: 1.5rem;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tags span {
    background: var(--color-primary);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    opacity: 0.8;
}

.status {
    color: var(--color-success);
    font-weight: 600;
    margin-bottom: 1rem;
}

.view-btn {
    display: inline-block;
    color: var(--color-primary);
    font-weight: 600;
    transition: all 0.3s ease;
}

.view-btn:hover {
    transform: translateX(5px);
}

/* ============= CONTACT SECTION ============= */
.contact {
    padding: 6rem 0;
    background: var(--color-bg-secondary);
}

.section-desc {
    text-align: center;
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: 3rem;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-method {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.contact-method i {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-top: 0.5rem;
}

.contact-method h3 {
    margin-bottom: 0.5rem;
}

.contact-method a {
    color: var(--color-text-light);
}

.contact-form {
    background: var(--color-bg);
    padding: 2.5rem;
    border-radius: 12px;
    border: 1px solid var(--color-border);
}

.contact-form h3 {
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-bg-secondary);
    color: var(--color-text);
    font-family: inherit;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.contact-form button {
    width: 100%;
}

.form-status {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    display: none;
}

.form-status.success {
    display: block;
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
    border: 1px solid var(--color-success);
}

.form-status.error {
    display: block;
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-error);
    border: 1px solid var(--color-error);
}

/* ============= FOOTER ============= */
.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: 2rem 0;
    text-align: center;
    color: var(--color-text-light);
}

/* ============= STATUS BADGE ============= */
.status-badge {
    display: inline-block;
    background: linear-gradient(135deg, #10b981, #34d399);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

/* ============= TRUST BADGES ============= */
.trust-badges {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--color-bg-secondary);
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
}

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

.badge i {
    color: var(--color-accent);
}

/* ============= EXPERIENCE TIMELINE ============= */
.experience {
    padding: 4rem 0;
    background: linear-gradient(180deg, var(--color-bg-secondary), var(--color-bg));
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
}

.timeline-item {
    margin-bottom: 3rem;
    position: relative;
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-left: 0;
    margin-right: auto;
    width: calc(50% - 2rem);
    text-align: right;
}

.timeline-item:nth-child(even) .timeline-content {
    margin-left: auto;
    margin-right: 0;
    width: calc(50% - 2rem);
    text-align: left;
}

.timeline-marker {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 16px;
    height: 16px;
    background: var(--color-primary);
    border: 3px solid var(--color-bg);
    border-radius: 50%;
    top: 20px;
}

.timeline-content {
    background: var(--color-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 3px solid var(--color-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.timeline-content:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.15);
}

.timeline-date {
    font-size: 0.9rem;
    color: var(--color-accent);
    font-weight: 600;
    margin: 0.5rem 0;
}

.timeline-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 1rem;
    justify-content: flex-start;
}

.timeline-tags span {
    background: var(--color-primary);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* ============= TESTIMONIALS ============= */
.testimonials {
    padding: 4rem 0;
    background: var(--color-bg-secondary);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.testimonial-card {
    background: var(--color-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.testimonial-card::before {
    content: '\\201C';
    position: absolute;
    top: -20px;
    right: 20px;
    font-size: 6rem;
    color: var(--color-primary);
    opacity: 0.1;
    font-family: Georgia, serif;
}

.testimonial-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.15);
    border-color: var(--color-primary);
}

.rating {
    color: #fbbf24;
    margin-bottom: 1rem;
    font-size: 1.1rem;
    letter-spacing: 2px;
}

.testimonial-text {
    color: var(--color-text-light);
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
    font-style: italic;
}

.testimonial-author h4 {
    margin-bottom: 0.25rem;
    color: var(--color-text);
}

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

/* ============= FOOTER ============= */
.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: 3rem 0 1rem;
    color: var(--color-text-light);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--color-border);
}

.footer-column h3,
.footer-column h4 {
    color: var(--color-text);
    margin-bottom: 1rem;
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: 0.5rem;
}

.footer-column a {
    color: var(--color-text-light);
    transition: color 0.3s ease;
}

.footer-column a:hover {
    color: var(--color-primary);
}

.footer-social {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.footer-social a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-border);
    border-radius: 50%;
    transition: all 0.3s ease;
}

.footer-social a:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    margin: 0.5rem 0;
    font-size: 0.9rem;
}

/* ============= BACK TO TOP BUTTON ============= */
.back-to-top {
    position: fixed;
    bottom: -50px;
    right: 2rem;
    width: 45px;
    height: 45px;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 99;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
}

.back-to-top.show {
    bottom: 2rem;
}

/* ============= RESPONSIVE ============= */
@media (max-width: 768px) {
    h2 {
        font-size: 2rem;
    }
    
    .hero .container,
    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .hero-left h1 {
        font-size: 2.5rem;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        flex-direction: column;
        gap: 0;
        background: var(--color-bg);
        border-top: 1px solid var(--color-border);
        padding: 1rem 0;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-link {
        padding: 1rem 20px;
        display: block;
    }
    
    .nav-link.active::after {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .profile-box {
        width: 250px;
        height: 250px;
    }
}

@media (max-width: 480px) {
    .hero-left h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1.2rem;
    }
    
    h2 {
        font-size: 1.8rem;
        margin-bottom: 2rem;
    }
    
    .hero,
    .about,
    .skills,
    .projects,
    .contact {
        padding: 3rem 0;
    }
    
    .profile-box {
        width: 200px;
        height: 200px;
    }
    
    .social-links {
        gap: 1rem;
    }
    
    .social-links a {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    
    /* Timeline mobile fixes */
    .timeline::before {
        left: 15px;
    }
    
    .timeline-item:nth-child(odd) .timeline-content,
    .timeline-item:nth-child(even) .timeline-content {
        margin-left: 60px;
        margin-right: 0;
        width: calc(100% - 60px);
        text-align: left;
    }
    
    .timeline-marker {
        left: 15px;
    }
    
    /* Testimonials mobile */
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    /* Footer mobile */
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-social {
        justify-content: center;
    }
    
    /* Trust badges mobile */
    .trust-badges {
        justify-content: center;
    }
}