/* ===== Reset & Base Styles ===== */
:root {
  --primary-color: #4d61fc;
  --primary-hover: #3a4dd1;
  --secondary-color: #1e293b;
  --background-color: #ffffff;
  --text-color: #334155;
  --text-light: #64748b;
  --border-color: #e2e8f0;
  --card-bg: #ffffff;
  --muted-bg: #f8fafc;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.05);
  --transition: all 0.3s ease;
  --max-width: 1200px;
  --header-height: 70px;
  --radius: 8px;

  /* Font sizes */
  --font-xs: 0.75rem;
  --font-sm: 0.875rem;
  --font-md: 1rem;
  --font-lg: 1.125rem;
  --font-xl: 1.25rem;
  --font-2xl: 1.5rem;
  --font-3xl: 1.875rem;
  --font-4xl: 2.25rem;
  --font-5xl: 3rem;
}

/* Dark Theme Colors */
.dark-theme {
  --primary-color: #6d78ff;
  --primary-hover: #5a64de;
  --secondary-color: #94a3b8;
  --background-color: #0f172a;
  --text-color: #e2e8f0;
  --text-light: #94a3b8;
  --border-color: #1e293b;
  --card-bg: #1e293b;
  --muted-bg: #1e293b;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: "Poppins", sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
  transition: var(--transition);
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

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

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: 1.4;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--secondary-color);
}

h1 {
  font-size: var(--font-4xl);
}

h2 {
  font-size: var(--font-2xl);
}

h3 {
  font-size: var(--font-xl);
}

h4 {
  font-size: var(--font-lg);
}

section {
  padding: 3rem 0;
}

p {
  margin-bottom: 1rem;
}

.section {
  padding: 3rem 0;
}

.section-title {
  text-align: center;
  margin-bottom: 2rem;
}

.section-title h2 {
  font-size: var(--font-2xl);
  margin-bottom: 1rem;
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -0.5rem;
  width: 50px;
  height: 3px;
  background: var(--primary-color);
  transform: translateX(-50%);
}

.section-title p {
  max-width: 700px;
  margin: 0 auto;
  color: var(--text-light);
  font-size: var(--font-sm);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-size: var(--font-sm);
}

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

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

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

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

.btn-download {
  margin-top: 1rem;
}

.btn-submit {
  width: 100%;
  margin-top: 1rem;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: var(--background-color);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: var(--transition);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo a {
  font-size: var(--font-xl);
  font-weight: 700;
}

.logo span {
  color: var(--primary-color);
}

.nav-menu {
  display: none;
}

.nav-list {
  display: flex;
  gap: 2rem;
}

.nav-link {
  font-size: var(--font-sm);
  font-weight: 500;
  transition: var(--transition);
}

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

.header-buttons {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle {
  background: transparent;
  border: none;
  color: var(--text-color);
  cursor: pointer;
  font-size: var(--font-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.theme-toggle:hover {
  color: var(--primary-color);
}

.mobile-menu-btn {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  cursor: pointer;
}

.mobile-menu-btn span {
  width: 100%;
  height: 2px;
  background-color: var(--text-color);
  transition: var(--transition);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  background-color: var(--background-color);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  z-index: 999;
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.mobile-menu.active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.mobile-nav-link {
  font-size: var(--font-md);
  font-weight: 500;
  padding: 0.5rem 0;
  display: block;
  transition: var(--transition);
}

.mobile-nav-link:hover {
  color: var(--primary-color);
  transform: translateX(5px);
}

/* Hero Section */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: var(--header-height);
  background-color: var(--muted-bg);
}

.hero-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 0;
}

.hero-title {
  font-size: var(--font-3xl);
  margin-bottom: 1rem;
}

.hero-title span {
  color: var(--primary-color);
}

.hero-subtitle {
  font-size: var(--font-lg);
  font-weight: 500;
  margin-bottom: 1.5rem;
  color: var(--text-light);
}

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

.hero-buttons {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 0 auto;
  max-width: 400px;
}

.scroll-down {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.scroll-down a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: white;
  transition: var(--transition);
}

.scroll-down a:hover {
  background-color: var(--primary-hover);
}

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

/* About Section */
.about-section {
  background-color: var(--background-color);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

.about-text h3 {
  margin-bottom: 1.5rem;
}

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

.skills-container h3 {
  margin-bottom: 1.5rem;
}

.skills-chart {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.skill-category h4 {
  margin-bottom: 1rem;
}

.skill-bars {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.skill-bar {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.skill-name {
  font-size: var(--font-sm);
  font-weight: 500;
}

.skill-progress {
  height: 8px;
  background-color: var(--border-color);
  border-radius: 10px;
  overflow: hidden;
}

.skill-percentage {
  height: 100%;
  background-color: var(--primary-color);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 0.5rem;
  transition: width 1s ease-in-out;
}

.skill-percentage span {
  color: white;
  font-size: var(--font-xs);
  font-weight: 500;
}

/* Resume Section & Flowcharts */
.resume-section {
  background-color: var(--muted-bg);
}

.resume-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  margin-bottom: 4rem;
}

.timeline-container {
  position: relative;
}

.timeline-title {
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.timeline-title i {
  color: var(--primary-color);
}

.timeline {
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 0;
  left: 1.5rem;
  height: 100%;
  width: 2px;
  background-color: var(--primary-color);
}

.timeline-item {
  position: relative;
  padding-left: 3.5rem;
  padding-bottom: 2rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: 0.4rem;
  top: 0;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background-color: var(--primary-color);
  border: 4px solid var(--muted-bg);
  z-index: 1;
}

.timeline-date {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background-color: var(--primary-color);
  color: white;
  border-radius: var(--radius);
  font-size: var(--font-xs);
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.timeline-content {
  padding: 1.5rem;
  background-color: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.timeline-content h4 {
  margin-bottom: 0.5rem;
}

.timeline-content p {
  color: var(--text-light);
  font-size: var(--font-sm);
}

/* Skills Flowchart */
.skills-flowchart {
  margin-top: 3rem;
}

.flowchart-title {
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-align: center;
  justify-content: center;
}

.flowchart-title i {
  color: var(--primary-color);
}

.flowchart {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  padding: 2rem 1rem;
  background-color: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow-x: auto;
  width: 100%;
}

.flowchart-node {
  padding: 1.5rem 1rem;
  background-color: var(--muted-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  min-width: 200px;
  text-align: center;
  position: relative;
  transition: var(--transition);
  width: 100%;
  max-width: 250px;
}

.flowchart-node:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.start-node,
.end-node {
  border: 2px solid var(--primary-color);
}

.start-node span,
.end-node span {
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--primary-color);
  color: white;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius);
  font-size: var(--font-xs);
  font-weight: 500;
  white-space: nowrap;
}

.end-node span {
  top: auto;
  bottom: -10px;
}

.highlight-node {
  background-color: var(--primary-color);
  color: white;
}

.highlight-node h4,
.highlight-node p {
  color: white;
}

.node-content h4 {
  margin-bottom: 0.5rem;
  font-size: var(--font-md);
}

.node-content p {
  font-size: var(--font-xs);
  color: var(--text-light);
}

.flowchart-arrow {
  width: 40px;
  height: 2px;
  background-color: var(--primary-color);
  position: relative;
}

.flowchart-arrow::after {
  content: "";
  position: absolute;
  right: 0;
  top: -4px;
  width: 0;
  height: 0;
  border-left: 8px solid var(--primary-color);
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
}

.flowchart-arrow.vertical {
  width: 2px;
  height: 30px;
  margin: 0.5rem 0;
}

.flowchart-arrow.vertical::after {
  right: -4px;
  top: auto;
  bottom: 0;
  transform: rotate(90deg);
}

.flowchart-arrow.down {
  transform: rotate(90deg);
  margin: 1rem 0;
}

.flowchart-branches {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2rem;
  width: 100%;
}

.branch {
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Projects Section */
.projects-section {
  background-color: var(--background-color);
}

.project-filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 3rem;
}

.filter-btn {
  padding: 0.5rem 1rem;
  background-color: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: var(--font-sm);
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.projects-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.project-card {
  background-color: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.project-img {
  position: relative;
  overflow: hidden;
  height: 200px;
}

.project-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

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

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: 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-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  padding: 0 1rem;
}

.project-link {
  padding: 0.5rem 1rem;
  background-color: var(--primary-color);
  color: white;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--font-sm);
  transition: var(--transition);
}

.project-link:hover {
  background-color: var(--primary-hover);
}

.project-info {
  padding: 1.5rem;
}

.project-title {
  margin-bottom: 0.5rem;
}

.project-description {
  color: var(--text-light);
  font-size: var(--font-sm);
  margin-bottom: 1rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.project-tag {
  padding: 0.25rem 0.5rem;
  background-color: var(--muted-bg);
  border-radius: var(--radius);
  font-size: var(--font-xs);
  color: var(--text-light);
}

/* Contact Section */
.contact-section {
  background-color: var(--muted-bg);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

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

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.contact-icon {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-lg);
}

.contact-text p {
  font-size: var(--font-sm);
  color: var(--text-light);
  margin-bottom: 0.25rem;
}

.contact-text a {
  color: var(--primary-color);
  font-weight: 500;
  transition: var(--transition);
}

.contact-text a:hover {
  text-decoration: underline;
}

.social-links h3 {
  margin-bottom: 1.5rem;
}

.social-icons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.social-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--card-bg);
  color: var(--text-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-lg);
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

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

.contact-form-container {
  background-color: var(--card-bg);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

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

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

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

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(77, 97, 252, 0.2);
}

.form-error {
  color: #e53e3e;
  font-size: var(--font-xs);
  margin-top: 0.25rem;
  display: block;
}

/* Footer */
.footer {
  background-color: var(--card-bg);
  padding: 2rem 0;
  border-top: 1px solid var(--border-color);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.footer-copyright {
  text-align: center;
  font-size: var(--font-sm);
  color: var(--text-light);
}

.footer-nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
}

.footer-nav-link {
  font-size: var(--font-sm);
  color: var(--text-light);
  transition: var(--transition);
}

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

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 40px;
  height: 40px;
  background-color: var(--primary-color);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 99;
}

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

.back-to-top:hover {
  background-color: var(--primary-hover);
  transform: translateY(-5px);
}

/* Developer Photo Styles */
.developer-photo-container {
  margin-bottom: 2.5rem;
  position: relative;
}

.developer-photo {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  overflow: hidden;
  margin: 0 auto;
  border: 5px solid var(--primary-color);
  box-shadow: var(--shadow-lg);
  position: relative;
  z-index: 1;
  transition: transform 0.5s ease, box-shadow 0.5s ease;
}

.developer-photo::before {
  content: "";
  position: absolute;
  top: -10px;
  left: -10px;
  right: -10px;
  bottom: -10px;
  border-radius: 50%;
  border: 2px dashed var(--primary-color);
  animation: rotate 20s linear infinite;
  opacity: 0.5;
  z-index: -1;
}

.developer-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.developer-photo:hover {
  transform: scale(1.05);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.developer-photo:hover img {
  transform: scale(1.1);
}

@keyframes rotate {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Animation */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.6s ease forwards;
}

/* Media Queries */
@media screen and (max-width: 480px) {
  h1 {
    font-size: var(--font-2xl);
  }

  h2 {
    font-size: var(--font-xl);
  }

  .section {
    padding: 2rem 0;
  }

  .hero-title {
    font-size: var(--font-2xl);
  }

  .hero-subtitle {
    font-size: var(--font-md);
  }

  .developer-photo {
    width: 120px;
    height: 120px;
  }

  .flowchart-node {
    padding: 1rem;
    min-width: 150px;
  }

  .node-content h4 {
    font-size: var(--font-sm);
  }

  .node-content p {
    font-size: 0.7rem;
  }

  .contact-form-container {
    padding: 1.5rem;
  }
}

@media screen and (min-width: 481px) and (max-width: 767px) {
  .hero-title {
    font-size: var(--font-3xl);
  }

  .developer-photo {
    width: 180px;
    height: 180px;
  }

  .flowchart-branches {
    flex-direction: column;
    gap: 1.5rem;
  }
}

@media screen and (min-width: 576px) {
  .hero-buttons {
    flex-direction: row;
    justify-content: center;
  }
}

@media screen and (min-width: 768px) {
  h1 {
    font-size: var(--font-4xl);
  }

  h2 {
    font-size: var(--font-3xl);
  }

  .section {
    padding: 4rem 0;
  }

  .nav-menu {
    display: block;
  }

  .mobile-menu-btn {
    display: none;
  }

  .about-content,
  .resume-content,
  .contact-content {
    grid-template-columns: 1fr 1fr;
  }

  .projects-container {
    grid-template-columns: repeat(2, 1fr);
  }

  .timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .timeline-item {
    padding-left: 0;
    padding-right: 0;
    width: 50%;
  }

  .timeline-item:nth-child(odd) {
    margin-right: 50%;
    padding-right: 3.5rem;
  }

  .timeline-item:nth-child(even) {
    margin-left: 50%;
    padding-left: 3.5rem;
  }

  .timeline-dot {
    left: auto;
    right: 0.4rem;
  }

  .timeline-item:nth-child(even) .timeline-dot {
    right: auto;
    left: 0.4rem;
  }

  .developer-photo {
    width: 200px;
    height: 200px;
  }

  .flowchart-branches {
    flex-direction: row;
    gap: 2rem;
  }

  .branch {
    flex: 1;
  }

  .footer-content {
    flex-direction: row;
    justify-content: space-between;
  }
}

@media screen and (min-width: 992px) {
  .projects-container {
    grid-template-columns: repeat(3, 1fr);
  }

  .skill-visualization {
    grid-template-columns: 1fr 1fr;
  }

  .developer-photo {
    width: 220px;
    height: 220px;
  }

  .flowchart {
    padding: 2rem;
  }

  .flowchart-node {
    padding: 1.5rem;
  }
}

@media screen and (min-width: 1200px) {
  .developer-photo {
    width: 250px;
    height: 250px;
  }
}