/* ============================================
   Professional Portfolio Stylesheet
   Enhanced with modern design principles
   ============================================ */

/* ========== CSS Variables - Enhanced Color Theme ========== */
:root {
    /* Background Colors - Rich Dark Theme */
    --primary-bg: #0f172a;
    --secondary-bg: #1e293b;
    --tertiary-bg: #334155;
    
    /* Text Colors */
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    /* Accent Colors - Vibrant Gradient Theme */
    --accent-primary: #3b82f6;
    --accent-secondary: #8b5cf6;
    --accent-color: #06b6d4;
    --accent-hover: #22d3ee;
    --accent-gradient: linear-gradient(135deg, #3b82f6, #8b5cf6, #06b6d4);
    
    /* Card Colors */
    --card-bg: rgba(30, 41, 59, 0.8);
    --card-hover: rgba(59, 130, 246, 0.15);
    --card-border: rgba(59, 130, 246, 0.2);
    
    /* UI Elements */
    --border-radius: 12px;
    --border-radius-lg: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 12px 48px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 30px rgba(59, 130, 246, 0.4);
    --shadow-glow-cyan: 0 0 30px rgba(6, 182, 212, 0.4);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--primary-bg) 0%, #0a1628 100%);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    font-size: 16px;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(6, 182, 212, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* ========== Typography ========== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
}

h2 {
    font-size: clamp(2rem, 4vw, 2.5rem);
    position: relative;
    display: inline-block;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--accent-gradient);
    border-radius: 2px;
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.5);
}

h3 {
    font-size: 1.5rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h4 {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

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

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

/* ========== Navigation - Enhanced Styling ========== */
.navbar {
    background: rgba(15, 23, 42, 0.9);
    padding: 1.2rem 3rem;
    position: fixed !important;
    width: 100%;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(59, 130, 246, 0.2);
    transition: var(--transition);
    visibility: visible !important;
    opacity: 1 !important;
    display: block !important;
}

.navbar.scrolled {
    background: rgba(15, 23, 42, 0.98);
    box-shadow: var(--shadow-md), 0 1px 0 rgba(59, 130, 246, 0.1);
    padding: 1rem 3rem;
}

.nav-container {
    display: flex !important;
    justify-content: space-between !important;
    align-items: center !important;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    position: relative;
}

/* Logo - Upper Left Corner */
.logo-container {
    display: flex !important;
    align-items: center !important;
    gap: 12px;
    transition: var(--transition);
    position: relative;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    order: 1;
    flex-shrink: 0;
    visibility: visible !important;
    opacity: 1 !important;
}

#logo-link {
    display: inline-block;
    line-height: 0;
}

.logo-container::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--border-radius);
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.logo-container:hover {
    transform: translateY(-2px);
}

.logo-container:hover::before {
    opacity: 0.1;
}

.logo-img {
    height: 45px;
    width: auto;
    max-width: 150px;
    filter: drop-shadow(0 0 10px rgba(59, 130, 246, 0.6));
    transition: var(--transition);
    display: block;
    object-fit: contain;
}

.logo-container:hover .logo-img {
    filter: drop-shadow(0 0 15px rgba(59, 130, 246, 0.8));
    transform: scale(1.05);
}

.logo-text {
    font-size: 1.9rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.menu-toggle {
    display: none;
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--text-primary);
    transition: var(--transition);
    order: 2;
    flex-shrink: 0;
}

.menu-toggle:hover {
    color: var(--accent-color);
}

/* Menu - Upper Right Corner */
.menu {
    display: flex !important;
    list-style: none !important;
    gap: 0.5rem;
    align-items: center;
    background: rgba(30, 41, 59, 0.6);
    padding: 0.5rem;
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(59, 130, 246, 0.2);
    backdrop-filter: blur(10px);
    order: 3;
    margin: 0;
    flex-shrink: 0;
    visibility: visible !important;
    opacity: 1 !important;
    position: relative;
}

.menu li {
    position: relative;
}

.menu li a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
    padding: 0.65rem 1.5rem;
    position: relative;
    transition: var(--transition);
    border-radius: var(--border-radius);
    display: block;
    background: transparent;
}

.menu li a::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--border-radius);
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.menu li a:hover {
    color: #ffffff;
    transform: translateY(-2px);
}

.menu li a:hover::before {
    opacity: 0.2;
}

.menu li a:active {
    transform: translateY(0);
}

/* ========== Sections ========== */
section {
    padding: 100px 10% 60px;
    min-height: auto;
    position: relative;
    z-index: 1;
}

section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--accent-gradient);
    opacity: 0.3;
}

/* ========== Hero Section ========== */
#hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 100vh;
    padding-top: 120px;
    gap: 4rem;
}

.hero-content {
    max-width: 600px;
    order: 1;
    animation: fadeInLeft 0.8s ease-out;
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
    font-weight: 400;
}

.hero-title {
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: 700;
    margin: 0.5rem 0;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 2px 10px rgba(59, 130, 246, 0.3));
}

.hero-description {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin: 1.5rem 0;
}

.profile-pic {
    width: 350px;
    height: 350px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--accent-color);
    box-shadow: var(--shadow-glow-cyan), var(--shadow-lg), 
                0 0 0 3px rgba(59, 130, 246, 0.2);
    order: 2;
    transition: var(--transition);
    animation: fadeInRight 0.8s ease-out;
    position: relative;
}

.profile-pic::before {
    content: '';
    position: absolute;
    top: -15px;
    left: -15px;
    width: 380px;
    height: 380px;
    border-radius: 50%;
    border: 3px solid var(--accent-secondary);
    opacity: 0.4;
    animation: pulse 3s infinite;
    z-index: -1;
}

.profile-pic:hover {
    transform: scale(1.05);
    box-shadow: 0 0 40px rgba(100, 255, 218, 0.5);
}

.resume-btn-container {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.cool-resume-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 1rem 2rem;
    background: transparent;
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    border-radius: var(--border-radius);
    border: 2px solid var(--accent-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.cool-resume-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: rgba(100, 255, 218, 0.1);
    transition: left 0.3s ease;
}

.cool-resume-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow), var(--shadow-md);
    background: var(--accent-gradient);
    color: #ffffff;
    border-color: transparent;
}

.cool-resume-btn:hover::before {
    opacity: 0;
}

.cool-resume-btn:hover::before {
    left: 0;
}

.cool-resume-btn .btn-icon {
    font-size: 1.2rem;
}

/* ========== Projects Section ========== */
#projects {
    background: linear-gradient(180deg, var(--primary-bg) 0%, var(--secondary-bg) 100%);
    position: relative;
}

#projects h2 {
    margin-bottom: 3rem;
}

.projects-container {
    position: relative;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.project-list {
    display: flex;
    gap: 2rem;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding: 1rem 0;
    scrollbar-width: none;
    scroll-behavior: smooth;
}

.project-list::-webkit-scrollbar {
    display: none;
}

.project-card {
    flex: 0 0 calc(33.333% - 1.34rem);
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    scroll-snap-align: start;
    transition: var(--transition);
    position: relative;
    cursor: pointer;
    border: 1px solid var(--card-border);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

.project-card:hover {
    transform: translateY(-10px) scale(1.02);
    background: rgba(30, 41, 59, 0.95);
    border-color: var(--accent-color);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.project-card a {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.project-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 5px;
    margin-bottom: 1rem;
    transition: var(--transition);
}

.project-card:hover .project-image {
    transform: scale(1.05);
}

.project-card h3 {
    margin-top: 1rem;
    margin-bottom: 0.5rem;
}

.project-card p {
    font-size: 0.95rem;
    line-height: 1.6;
}

.project-card em {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-style: normal;
    font-size: 0.9rem;
    font-weight: 500;
}

.project-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(100, 255, 218, 0.2);
    border: none;
    color: var(--accent-color);
    width: 45px;
    height: 45px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: var(--transition);
    z-index: 10;
    backdrop-filter: blur(10px);
}

.project-btn:hover {
    background: rgba(100, 255, 218, 0.4);
    transform: translateY(-50%) scale(1.1);
}

.project-btn.prev {
    left: 0;
}

.project-btn.next {
    right: 0;
}

/* ========== Certificates Section ========== */
#certificates {
    position: relative;
}

.certificate-carousel {
    position: relative;
    margin-top: 2rem;
    width: 100%;
    max-width: 1200px;
    margin: 2rem auto 0;
    padding: 0 40px;
}

.carousel-track {
    display: flex;
    gap: 2rem;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding: 1rem 0;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    scroll-behavior: smooth;
}

.carousel-track::-webkit-scrollbar {
    display: none;
}

.certificate-card {
    flex: 0 0 calc(33.333% - 1.34rem);
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    scroll-snap-align: start;
    border: 1px solid var(--card-border);
    backdrop-filter: blur(10px);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.certificate-card:hover {
    transform: translateY(-5px) scale(1.02);
    border-color: var(--accent-color);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.certificate-card h3 {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.certificate-card h4 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1rem;
}

.certificate-card a {
    display: inline-block;
    margin-top: 1rem;
    color: var(--accent-color);
    text-decoration: underline;
    transition: var(--transition);
}

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

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(100, 255, 218, 0.2);
    border: none;
    color: var(--accent-color);
    width: 45px;
    height: 45px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: var(--transition);
    z-index: 10;
    backdrop-filter: blur(10px);
}

.carousel-btn:hover {
    background: rgba(100, 255, 218, 0.4);
    transform: translateY(-50%) scale(1.1);
}

.carousel-btn.prev {
    left: 0;
}

.carousel-btn.next {
    right: 0;
}

/* ========== Contact Section ========== */
#contact {
    text-align: center;
    padding: 80px 10% 40px;
    background: linear-gradient(180deg, var(--secondary-bg) 0%, var(--primary-bg) 100%);
}

#contact h2 {
    margin-bottom: 1rem;
}

#contact > p {
    max-width: 600px;
    margin: 0 auto 2rem;
    font-size: 1.1rem;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.contact-link {
    color: var(--accent-color);
    text-decoration: none;
    font-size: 1.2rem;
    padding: 1rem 1.5rem;
    border: 2px solid var(--accent-color);
    background: transparent;
    border-radius: var(--border-radius);
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.contact-link:hover {
    color: #ffffff;
    background: var(--accent-gradient);
    border-color: transparent;
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow), var(--shadow-md);
}

.contact-link i {
    font-size: 1.3rem;
}

/* ========== Footer ========== */
footer {
    text-align: center;
    padding: 2rem;
    background-color: var(--primary-bg);
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid rgba(100, 255, 218, 0.1);
}

/* ========== Animations ========== */
@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.3;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(1.05);
    }
}

/* ========== Responsive Design ========== */
@media (max-width: 1024px) {
    .project-card,
    .certificate-card {
        flex: 0 0 calc(50% - 1rem);
    }
    
    section {
        padding: 80px 8% 50px;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: 1rem 1.5rem;
    }
    
    .menu {
        display: none !important;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(15, 23, 42, 0.98);
        padding: 1rem;
        box-shadow: var(--shadow-md);
        backdrop-filter: blur(20px);
        border-radius: var(--border-radius);
        border: 1px solid rgba(59, 130, 246, 0.2);
        gap: 0.5rem;
    }
    
    .menu li a {
        padding: 1rem;
        text-align: center;
    }
    
    .menu.active {
        display: flex;
    }
    
    .menu-toggle {
        display: block;
    }
    
    #hero {
        flex-direction: column;
        text-align: center;
        padding-top: 100px;
        min-height: auto;
        gap: 2rem;
    }
    
    .hero-content {
        margin-top: 2rem;
        order: 2;
    }
    
    .profile-pic {
        width: 250px;
        height: 250px;
        order: 1;
    }
    
    .profile-pic::before {
        width: 270px;
        height: 270px;
        top: -10px;
        left: -10px;
    }
    
    .project-card,
    .certificate-card {
        flex: 0 0 100%;
        min-width: 0;
    }
    
    .project-btn, .carousel-btn {
        display: flex !important;
        width: 40px;
        height: 40px;
        font-size: 0.9rem;
        background: rgba(100, 255, 218, 0.5);
        box-shadow: var(--shadow-sm);
    }
    
    .project-btn.prev, .carousel-btn.prev {
        left: 10px;
    }
    
    .project-btn.next, .carousel-btn.next {
        right: 10px;
    }
    
    .projects-container, .certificate-carousel {
        padding: 0 30px;
    }
    
    .project-list, .carousel-track {
        padding: 1rem 0;
    }
    
    section {
        padding: 60px 5% 40px;
    }
    
    section h2 {
        font-size: 2rem;
    }
    
    .contact-links {
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .resume-btn-container {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .cool-resume-btn {
        width: 100%;
        justify-content: center;
    }
    
    .project-btn, .carousel-btn {
        width: 35px;
        height: 35px;
        font-size: 0.8rem;
    }
    
    .contact-link {
        font-size: 1rem;
        padding: 0.8rem 1.2rem;
    }
}

/* ========== Performance Optimizations ========== */
.project-card, .certificate-card {
    will-change: transform;
}

/* ========== Scrollbar Styling (for browsers that show it) ========== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--primary-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-hover);
}