/* =========================================
   Professional Minimal Portfolio CSS
   Modern Executive Design
   ========================================= */

:root {
    /* Professional Blue Color System */
    --bg-primary: #0f1419;
    --bg-secondary: #1a1f2e;
    --bg-tertiary: #252d3d;
    
    --text-primary: #e8eef7;
    --text-secondary: #a8b2c1;
    --text-muted: #6b7280;
    
    --accent-blue: #3b82f6;
    --accent-blue-light: #60a5fa;
    --accent-blue-dark: #1e40af;
    --accent-teal: #14b8a6;
    
    --border-color: rgba(255, 255, 255, 0.05);
    --overlay-dark: rgba(15, 20, 25, 0.7);
    
    /* Fonts */
    --font-body: 'Inter', sans-serif;
    --font-code: 'JetBrains Mono', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 1rem;
    --spacing-2xl: 5rem;
    
    /* Container */
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

/* =========================================
   Reset & Base Styles
   ========================================= */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    font-weight: 400;
    overflow-x: hidden;
    transform: translate3d(0, 0, 0);
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease, opacity 0.3s ease;
}

ul, ol {
    list-style: none;
}

/* =========================================
   Typography
   ========================================= */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 700;
}

h2 {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    font-weight: 700;
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

p {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* =========================================
   Header & Navigation
   ========================================= */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(15, 20, 25, 0.32);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 0;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 72px;
}

.logo {
    font-family: var(--font-code);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-blue);
    transition: all 0.3s ease;
}

.logo:hover {
    color: var(--accent-blue-light);
}

.nav-list {
    display: flex;
    gap: var(--spacing-xl);
    align-items: center;
}

.nav-link {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
    transition: color 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-blue);
    transition: width 0.3s ease;
}

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

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translateY(10px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translateY(-10px);
}

/* Mobile Hamburger */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-list {
        display: none;
    }

    .nav.nav-active .nav-list {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        border-bottom: 1px solid var(--border-color);
        padding: var(--spacing-lg) var(--container-padding);
        gap: var(--spacing-md);
    }
}

/* =========================================
   Hero Section
   ========================================= */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px var(--container-padding) 60px;
}

.hero .container {
    width: 100%;
}

.hero-content {
    max-width: 700px;
}

.hero-subtitle {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-blue);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: var(--spacing-md);
}

.hero-title {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    animation: fadeInUp 0.8s ease forwards;
}

.hero-tagline {
    font-size: 1.5rem;
    color: var(--accent-blue-light);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease 0.1s forwards;
    opacity: 0;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
    animation: fadeInUp 0.8s ease 0.2s forwards;
    opacity: 0;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    animation: fadeInUp 0.8s ease 0.3s forwards;
    opacity: 0;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    animation: bounce 2s infinite;
}

.scroll-indicator svg {
    width: 24px;
    height: 24px;
    stroke: var(--text-secondary);
    stroke-width: 1.5;
}

/* =========================================
   Common Section Styles
   ========================================= */

section {
    padding: var(--spacing-2xl) 0;
}

section.hero {
    padding: 120px 0 60px;
}

.section-header {
    margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    position: relative;
    padding-bottom: var(--spacing-md);
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-teal));
    border-radius: 2px;
}

/* =========================================
   About Section
   ========================================= */

.about {
    background-color: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    max-width: 900px;
}

.about-content p {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .about-content {
        grid-template-columns: 1fr;
    }
}

/* =========================================
   Skills Section
   ========================================= */

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.skill-category {
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: all 0.3s ease;
    will-change: transform, border-color, background-color;
    transform: translateZ(0);
}

.skill-category:hover {
    border-color: var(--accent-blue);
    background-color: rgba(59, 130, 246, 0.02);
    transform: translateY(-4px);
}

.skill-category h3 {
    margin-bottom: var(--spacing-md);
    color: var(--accent-blue-light);
}

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.skill-tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 6px;
    color: var(--accent-blue-light);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.skill-tag:hover {
    background-color: var(--accent-blue);
    color: var(--bg-primary);
    border-color: var(--accent-blue);
}

/* =========================================
   Projects Section
   ========================================= */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.project-card {
    display: flex;
    flex-direction: column;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.4s ease;
    height: 100%;
    will-change: transform, box-shadow;
    transform: translateZ(0);
}

.project-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-8px);
    background-color: rgba(59, 130, 246, 0.02);
    box-shadow: 0 20px 60px rgba(59, 130, 246, 0.1);
}

.project-image {
    width: 100%;
    height: 220px;
    background-size: cover;
    background-position: center;
    background-color: var(--bg-tertiary);
    transition: transform 0.4s ease;
    overflow: hidden;
}

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

.project-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-lg);
}

.project-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.project-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
    line-height: 1.6;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.project-tech span {
    font-size: 0.8rem;
    padding: 0.35rem 0.75rem;
    background-color: rgba(20, 184, 166, 0.1);
    color: var(--accent-teal);
    border-radius: 4px;
    border: 1px solid rgba(20, 184, 166, 0.2);
}

.project-link {
    color: var(--accent-blue);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.project-link:hover {
    color: var(--accent-blue-light);
    transform: translateX(4px);
}

/* =========================================
   Credentials Section
   ========================================= */

.credentials {
    background-color: var(--bg-secondary);
}

.credentials-subsection {
    margin-bottom: var(--spacing-2xl);
}

.credentials-subsection h3 {
    color: var(--accent-blue-light);
    margin-bottom: var(--spacing-lg);
    font-size: 1.2rem;
}

.credentials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.credential-card {
    padding: var(--spacing-lg);
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: all 0.3s ease;
    will-change: transform, border-color, background-color;
    transform: translateZ(0);
    cursor: pointer;
}

.credential-card:hover {
    border-color: var(--accent-blue);
    background-color: rgba(59, 130, 246, 0.02);
    transform: translateY(-4px);
}

.credential-card h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.credential-issuer {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
}

/* Inline credential preview inside card */
.credential-preview {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding: var(--spacing-lg);
    border-radius: 12px;
    z-index: 10;
}

.credential-preview img {
    max-width: 100%;
    max-height: 80vh;
    border-radius: 8px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
}

.credential-preview .preview-close {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
}


.credential-date {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* =========================================
   Contact Section
   ========================================= */

.contact {
    padding: 70px 0;
    border-top: 1px solid var(--border-color);
}

.contact-content {
    text-align: center;
    max-width: 550px;
    margin: 0 auto;
}

.contact-subtitle {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-blue);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 0.8rem;
}

.contact-content h2 {
     margin-bottom: 1rem;
}

.contact-description {
    font-size: 1.05rem;
    color: var(--text-secondary);
    /*margin-bottom: var(--spacing-2xl);*/
     margin-bottom: 3rem;
}

.email-link {
    display: inline-block;
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--accent-blue);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
    margin-bottom: var(--spacing-xl);
}

.email-link:hover {
    color: var(--accent-blue-light);
    border-bottom-color: var(--accent-blue-light);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.social-links a {
    color: var(--text-secondary);
    font-weight: 600;
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
}

.social-links a:hover {
    color: var(--accent-blue);
    border-bottom-color: var(--accent-blue);
}

/* =========================================
   Button Styles
   ========================================= */

.btn {
    display: inline-block;
    padding: 0.75rem 1.75rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    border: 1px solid transparent;
    cursor: pointer;
    text-align: center;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background-color: var(--accent-blue-light);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: var(--accent-blue);
    border-color: var(--accent-blue);
}

.btn-secondary:hover {
    background-color: rgba(59, 130, 246, 0.1);
    transform: translateY(-2px);
}

/* =========================================
   Footer
   ========================================= */

.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-xl) 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* =========================================
   Animations
   ========================================= */

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

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(-10px);
    }
}

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

.scroll-reveal {
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
}

/* Canvas Background */

#canvas-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    contain: layout style paint;
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* =========================================
   Responsive Design
   ========================================= */

@media (max-width: 1024px) {
    :root {
        --spacing-2xl: 3.5rem;
        --container-padding: 1.25rem;
    }

    .nav-list {
        gap: var(--spacing-lg);
    }

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

@media (max-width: 768px) {
    :root {
        --spacing-2xl: 2.5rem;
        --spacing-xl: 2rem;
        --container-padding: 1rem;
    }

    section {
        padding: var(--spacing-xl) 0;
    }

    .hero {
        min-height: 85vh;
        padding: 100px var(--container-padding) 50px;
    }

    .hero-cta {
        flex-direction: column;
    }

    .hero-cta .btn {
        width: 100%;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .credentials-grid {
        grid-template-columns: 1fr;
    }

    .social-links {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .contact-content h2 {
        margin: var(--spacing-lg);
    }

    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 1.8rem;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-xl: 1.5rem;
        --spacing-lg: 1.5rem;
    }

    .header-content {
        padding: 0 var(--container-padding);
    }

    .hero {
        min-height: 80vh;
        padding: 80px var(--container-padding) 40px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-tagline {
        font-size: 1.1rem;
    }

    .scroll-indicator {
        display: none;
    }

    .about-content {
        gap: var(--spacing-lg);
    }

    .projects-grid {
        gap: var(--spacing-lg);
    }

    .project-card {
        border-radius: 8px;
    }

    .section-header h2::after {
        width: 40px;
    }
}

/* ===============================
   Certificate Image Modal
================================ */

.view-badge {
    display: inline-block;
    margin-top: 12px;
    font-size: 0.8rem;
    color: var(--accent-blue);
    cursor: pointer;
    font-weight: 600;
}

.credential-card {
    cursor: pointer;
    position: relative;
}

.image-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: 0.3s ease;
    z-index: 2000;
}

.image-modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    position: relative;
    max-width: 90%;
    max-height: 85%;
}

.modal-content img {
    width: 100%;
    max-height: 85vh;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    font-size: 30px;
    color: white;
    cursor: pointer;
}