/* ============================================
   ZERO PORTFOLIO - BLACK & WHITE THEME
   Clean, minimal, professional
   ============================================ */

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

/* CSS Variables */
:root {
    --black: #000000;
    --white: #ffffff;
    --gray-100: #f5f5f5;
    --gray-200: #eaeaea;
    --gray-300: #cccccc;
    --gray-400: #999999;
    --gray-500: #666666;
    --gray-600: #444444;
    --gray-700: #333333;
    --gray-800: #222222;
    --gray-900: #111111;
    --transition: all 0.3s ease;
    --shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 10px 30px rgba(0, 0, 0, 0.2);
    --border-radius: 12px;
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --black: #ffffff;
    --white: #000000;
    --gray-100: #111111;
    --gray-200: #222222;
    --gray-300: #333333;
    --gray-400: #666666;
    --gray-500: #999999;
    --gray-600: #cccccc;
    --gray-700: #eaeaea;
    --gray-800: #f5f5f5;
    --gray-900: #ffffff;
    --shadow: 0 5px 20px rgba(255, 255, 255, 0.05);
    --shadow-hover: 0 10px 30px rgba(255, 255, 255, 0.1);
}

/* Base Styles */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--white);
    color: var(--gray-600);
    line-height: 1.6;
    overflow-x: hidden;
    transition: var(--transition);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--black);
    color: var(--white);
    padding: 10px 20px;
    z-index: 9999;
    transition: top 0.3s;
}

.skip-link:focus {
    top: 0;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    inset: 0;
    background: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1040;
    transition: opacity 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    pointer-events: none;
}

.loader {
    text-align: center;
}

.loader-ring {
    width: 50px;
    height: 50px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--black);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 16px;
}

.loader-text {
    color: var(--gray-500);
    font-size: 14px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--black);
}

.brand-icon {
    width: 40px;
    height: 40px;
    background: var(--black);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-weight: 700;
    font-size: 18px;
    transition: var(--transition);
}

.brand-text {
    font-weight: 700;
    font-size: 20px;
    color: var(--black);
}

.nav-menu {
    display: flex;
    gap: 8px;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--gray-500);
    font-size: 14px;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--black);
    background: var(--gray-100);
}

.nav-link.active {
    color: var(--black);
    background: var(--gray-100);
    font-weight: 600;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    background: var(--black);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.nav-toggle {
    display: none;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--black);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 100px 0 60px;
    position: relative;
    background: var(--white);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-greeting {
    margin-bottom: 16px;
}

.greeting-text {
    font-size: 18px;
    color: var(--gray-400);
}

.hero-title {
    margin-bottom: 24px;
}

.title-main {
    display: block;
    font-size: 56px;
    font-weight: 800;
    color: var(--black);
    line-height: 1.1;
    margin-bottom: 8px;
}

.title-sub {
    display: block;
    font-size: 24px;
    font-weight: 600;
    color: var(--gray-500);
}

.hero-description {
    font-size: 18px;
    color: var(--gray-500);
    margin-bottom: 32px;
    max-width: 500px;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-bottom: 32px;
}

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

.stat-number {
    display: block;
    font-size: 32px;
    font-weight: 800;
    color: var(--black);
}

.stat-label {
    font-size: 14px;
    color: var(--gray-400);
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
}

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

.btn-primary:hover {
    background: var(--gray-700);
    border-color: var(--gray-700);
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background: var(--black);
    color: var(--white);
    transform: translateY(-2px);
}

/* Hero Visual */
.hero-image-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
}

.hero-image {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 4px solid var(--black);
    position: relative;
    overflow: hidden;
}

.profile-initials {
    font-size: 100px;
    font-weight: 800;
    color: var(--black);
}

.profile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.floating-elements {
    position: absolute;
    inset: 0;
}

.floating-tech {
    position: absolute;
    width: 50px;
    height: 50px;
    background: var(--black);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: var(--shadow);
    animation: float 3s ease-in-out infinite;
}

.floating-tech:nth-child(1) { top: 0; left: 0; animation-delay: 0s; }
.floating-tech:nth-child(2) { top: 20px; right: 0; animation-delay: 0.5s; }
.floating-tech:nth-child(3) { bottom: 20px; left: -10px; animation-delay: 1s; }
.floating-tech:nth-child(4) { bottom: 0; right: 10px; animation-delay: 1.5s; }

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-arrow {
    font-size: 24px;
    color: var(--black);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

/* Section Styles */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--black);
    background: var(--gray-100);
    padding: 6px 16px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 40px;
    font-weight: 800;
    color: var(--black);
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--gray-400);
    max-width: 600px;
    margin: 0 auto;
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-story p {
    margin-bottom: 16px;
    color: var(--gray-500);
    font-size: 16px;
}

.about-highlights {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 32px;
}

.highlight-item {
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.highlight-item i {
    font-size: 24px;
    color: var(--black);
    margin-top: 4px;
}

.highlight-item h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 4px;
}

.highlight-item p {
    font-size: 14px;
    color: var(--gray-400);
    margin: 0;
}

.skills-preview {
    background: var(--gray-100);
    border-radius: var(--border-radius);
    padding: 32px;
}

.skill-category {
    margin-bottom: 24px;
}

.skill-category:last-child {
    margin-bottom: 0;
}

.skill-category h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 12px;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tag {
    background: var(--black);
    color: var(--white);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    transition: var(--transition);
}

.skill-tag:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.skill-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: 32px;
    transition: var(--transition);
}

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

.skill-icon {
    width: 50px;
    height: 50px;
    background: var(--black);
    color: var(--white);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 16px;
}

.skill-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 8px;
}

.skill-card p {
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 16px;
}

.skill-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}

.skill-tech span {
    background: var(--gray-100);
    color: var(--black);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
}

.skill-progress {
    width: 100%;
    height: 6px;
    background: var(--gray-200);
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--black);
    border-radius: 3px;
    width: 0;
    transition: width 1s ease;
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.project-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
}

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

.project-image {
    position: relative;
    height: 200px;
    background: var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-placeholder {
    font-size: 48px;
    color: var(--black);
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

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

.project-link {
    width: 50px;
    height: 50px;
    background: var(--white);
    color: var(--black);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 20px;
    transition: var(--transition);
}

.project-link:hover {
    transform: scale(1.1);
}

.project-content {
    padding: 24px;
}

.project-content h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 8px;
}

.project-content p {
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 16px;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}

.project-tech span {
    background: var(--gray-100);
    color: var(--black);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
}

.project-stats {
    display: flex;
    gap: 20px;
}

.project-stats .stat {
    text-align: left;
}

.project-stats .stat-value {
    display: block;
    font-weight: 700;
    color: var(--black);
    font-size: 14px;
}

.project-stats .stat-label {
    font-size: 12px;
    color: var(--gray-400);
}

/* Experience Section */
.experience-track {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.experience-track::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gray-200);
    transform: translateX(-50%);
}

.xp-card {
    position: relative;
    margin-bottom: 32px;
}

.xp-card__dot {
    position: absolute;
    left: 50%;
    top: 30px;
    width: 16px;
    height: 16px;
    background: var(--black);
    border: 3px solid var(--white);
    border-radius: 50%;
    transform: translateX(-50%);
    z-index: 1;
    box-shadow: 0 0 0 3px var(--black);
}

.xp-card__header {
    width: calc(50% - 30px);
    margin-left: auto;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: 24px;
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
    display: block;
}

.xp-card:nth-child(even) .xp-card__header {
    margin-left: 0;
    margin-right: auto;
}

.xp-card__header:hover {
    border-color: var(--black);
    box-shadow: var(--shadow);
}

.xp-card__logo {
    width: 40px;
    height: 40px;
    background: var(--black);
    color: var(--white);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    margin-bottom: 12px;
}

.xp-card__company {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--black);
    margin-bottom: 4px;
}

.xp-card__title {
    display: block;
    font-size: 16px;
    font-weight: 700;
    color: var(--gray-600);
    margin-bottom: 4px;
}

.xp-card__date {
    display: block;
    font-size: 12px;
    color: var(--gray-400);
}

.xp-card__panel {
    display: none;
    width: calc(50% - 30px);
    margin-left: auto;
    background: var(--gray-100);
    border-radius: var(--border-radius);
    padding: 24px;
    margin-top: 8px;
}

.xp-card__panel[aria-hidden="false"] {
    display: block;
}

.xp-card__summary {
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 16px;
}

.xp-card__bullets {
    list-style: none;
    padding: 0;
    margin-bottom: 16px;
}

.xp-card__bullets li {
    font-size: 14px;
    color: var(--gray-500);
    padding-left: 16px;
    position: relative;
    margin-bottom: 8px;
}

.xp-card__bullets li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--black);
    font-weight: 700;
}

.xp-card__skills {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.xp-skill-group__title {
    font-size: 14px;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 8px;
}

.xp-skill-group__list {
    list-style: none;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.xp-skill-group__list li {
    background: var(--white);
    color: var(--black);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    border: 1px solid var(--gray-200);
}

/* Certifications Section */
.certifications-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    max-width: 900px;
    margin: 0 auto;
}

.cert-category h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 24px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--black);
}

.cert-items {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.cert-item {
    display: flex;
    gap: 16px;
    align-items: center;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: 16px;
    transition: var(--transition);
}

.cert-item:hover {
    border-color: var(--black);
    box-shadow: var(--shadow);
}

.cert-icon {
    width: 40px;
    height: 40px;
    background: var(--black);
    color: var(--white);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.cert-info h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 4px;
}

.cert-date {
    font-size: 12px;
    color: var(--gray-400);
}

/* Contact Section */
.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-cta h3 {
    font-size: 32px;
    font-weight: 800;
    color: var(--black);
    margin-bottom: 16px;
}

.contact-cta p {
    font-size: 16px;
    color: var(--gray-500);
    margin-bottom: 32px;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.social-links h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 16px;
}

.social-items {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.social-link {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--black);
    color: var(--white);
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    border: 2px solid var(--black);
}

.social-link:hover {
    background: var(--white);
    color: var(--black);
    transform: translateY(-2px);
}

.social-link i {
    font-size: 16px;
}

/* Footer */
.footer {
    background: var(--black);
    color: var(--white);
    padding: 40px 0;
    text-align: center;
}

.footer-content {
    margin-bottom: 24px;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-brand .brand-icon {
    background: var(--white);
    color: var(--black);
}

.footer-brand .brand-text {
    color: var(--white);
}

.footer-text {
    color: var(--gray-300);
    margin-bottom: 16px;
}

.footer-links {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--gray-300);
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: 16px;
    color: var(--gray-400);
    font-size: 14px;
}

.footer-bottom .fa-heart {
    color: var(--white);
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--black);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: var(--shadow);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

/* Animations */
[data-aos] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].animate-fadeInUp {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 1024px) {
    .skills-grid,
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-content,
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .hero-image-wrapper {
        order: -1;
    }
    
    .title-main {
        font-size: 40px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        border-bottom: 1px solid var(--gray-200);
        flex-direction: column;
        padding: 16px 24px;
        gap: 4px;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .skills-grid,
    .projects-grid,
    .certifications-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .hero-stats {
        gap: 20px;
    }
    
    .stat-number {
        font-size: 24px;
    }
    
    .experience-track::before {
        left: 20px;
    }
    
    .xp-card__dot {
        left: 20px;
    }
    
    .xp-card__header,
    .xp-card:nth-child(even) .xp-card__header,
    .xp-card__panel {
        width: calc(100% - 50px);
        margin-left: 50px;
        margin-right: 0;
    }
    
    .about-highlights {
        grid-template-columns: 1fr;
    }
    
    .section {
        padding: 60px 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .title-main {
        font-size: 32px;
    }
    
    .title-sub {
        font-size: 18px;
    }
    
    .hero-cta,
    .cta-buttons {
        flex-direction: column;
    }
    
    .btn {
        justify-content: center;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 12px;
    }
    
    .social-items {
        flex-direction: column;
        align-items: center;
    }
    
    .social-link {
        width: 100%;
        justify-content: center;
    }
}