/* Base Styles */
:root {
  --primary-color: #0066cc;
  --primary-dark: #004c99;
  --primary-light: #339aff;
  --secondary-color: #8a8a8a;
  --secondary-light: #b3b3b3;
  --accent-color: #4bd0a0;
  --success-color: #28a745;
  --warning-color: #ffc107;
  --error-color: #dc3545;
  --light-bg: #f8f9fa;
  --dark-bg: #121212;
  --light-text: #f8f9fa;
  --dark-text: #212529;
  --gray-100: #f8f9fa;
  --gray-200: #e9ecef;
  --gray-300: #dee2e6;
  --gray-400: #ced4da;
  --gray-500: #adb5bd;
  --gray-600: #6c757d;
  --gray-700: #495057;
  --gray-800: #343a40;
  --gray-900: #212529;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 16px;
  --spacing-1: 8px;
  --spacing-2: 16px;
  --spacing-3: 24px;
  --spacing-4: 32px;
  --spacing-5: 40px;
  --spacing-6: 48px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --transition-fast: 0.2s;
  --transition-normal: 0.3s;
  --transition-slow: 0.5s;
}

/* Light/Dark Mode Themes */
body {
  --bg-color: var(--light-bg);
  --text-color: var(--dark-text);
  --card-bg: #ffffff;
  --border-color: var(--gray-300);
  --section-bg: var(--gray-100);
}

body.dark-mode {
  --bg-color: var(--dark-bg);
  --text-color: var(--light-text);
  --card-bg: #1e1e1e;
  --border-color: var(--gray-700);
  --section-bg: #1a1a1a;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  line-height: 1.5;
  color: var(--text-color);
  background-color: var(--bg-color);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

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

ul {
  list-style: none;
}

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

/* Container */
.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-2) 0;
}

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-1) var(--spacing-3);
  border-radius: var(--border-radius-md);
  font-weight: 600;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  text-align: center;
}

.btn i {
  margin-right: var(--spacing-1);
}

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

.btn.primary:hover {
  background-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.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;
  transform: translateY(-2px);
}

/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(5px);
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-normal);
}

body.dark-mode header {
  background-color: rgba(18, 18, 18, 0.95);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-2) 0;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  background-color: var(--card-bg);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-normal);
}

nav ul {
  display: flex;
  gap: var(--spacing-3);
}

nav ul li a {
  font-weight: 500;
  color: var(--text-color);
  position: relative;
}

nav ul li a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: width var(--transition-normal);
}

nav ul li a:hover {
  color: var(--primary-color);
}

nav ul li a:hover::after {
  width: 100%;
}

/* Theme Toggle */
#theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-color);
  font-size: 1.25rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  position: relative;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

#theme-toggle:hover {
  background-color: var(--gray-200);
}

body.dark-mode #theme-toggle:hover {
  background-color: var(--gray-700);
}

#theme-toggle .fa-moon {
  display: block;
}

#theme-toggle .fa-sun {
  display: none;
}

body.dark-mode #theme-toggle .fa-moon {
  display: none;
}

body.dark-mode #theme-toggle .fa-sun {
  display: block;
}

/* Menu Toggle (Mobile) */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-color);
  transition: all var(--transition-fast);
}

/* Hero Section */
#hero {
  padding-top: 100px;
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-6);
}

.hero-text {
  flex: 1;
}

.hero-text h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: var(--spacing-1);
  color: var(--primary-color);
}

.hero-text h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-3);
  color: var(--secondary-color);
}

.hero-text p {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-4);
  max-width: 500px;
}

.cta-buttons {
  display: flex;
  gap: var(--spacing-2);
}

.hero-image {
  flex: 1;
  display: flex;
  justify-content: center;
}

.image-container {
  width: 350px;
  height: 350px;
  border-radius: 50%;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 5px solid var(--card-bg);
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.image-container:hover {
  transform: scale(1.02);
}

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

/* Section Styles */
section {
  padding: var(--spacing-5) 0;
}

section:nth-child(even) {
  background-color: var(--section-bg);
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-5);
  position: relative;
  padding-bottom: var(--spacing-2);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 3px;
  background-color: var(--primary-color);
}

/* About Section */
.about-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.about-content p {
  margin-bottom: var(--spacing-3);
  font-size: 1.1rem;
}

/* Experience - Timeline */
.timeline {
  position: relative;
  margin: 0 auto;
  max-width: 800px;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 100%;
  background-color: var(--border-color);
}

.timeline-item {
  position: relative;
  padding: var(--spacing-3) 0;
  width: 100%;
  display: flex;
}

.timeline-item:nth-child(odd) {
  justify-content: flex-start;
}

.timeline-item:nth-child(even) {
  justify-content: flex-end;
}

.timeline-dot {
  position: absolute;
  top: var(--spacing-4);
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--primary-color);
  z-index: 1;
}

.timeline-date {
  position: absolute;
  top: var(--spacing-3);
  width: 120px;
  text-align: center;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary-color);
  z-index: 2;
  background-color: var(--bg-color);
  padding: 2px 8px;
  border-radius: var(--border-radius-sm);
}

.timeline-item:nth-child(odd) .timeline-date {
  right: calc(50% + var(--spacing-3));
}

.timeline-item:nth-child(even) .timeline-date {
  left: calc(50% + var(--spacing-3));
}

.timeline-content {
  width: 45%;
  padding: var(--spacing-3);
  background-color: var(--card-bg);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-md);
}

.timeline-content h3 {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-1);
  color: var(--primary-color);
}

.timeline-content h4 {
  font-size: 1rem;
  margin-bottom: var(--spacing-2);
  color: var(--secondary-color);
}

.timeline-content ul {
  padding-left: var(--spacing-3);
  list-style-type: disc;
}

.timeline-content ul li {
  margin-bottom: var(--spacing-1);
}

/* Education Section */
.education-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
  max-width: 800px;
  margin: 0 auto;
}

.education-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-3);
  padding: var(--spacing-3);
  background-color: var(--card-bg);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-md);
}

.education-icon {
  font-size: 2rem;
  color: var(--primary-color);
  padding: var(--spacing-1);
}

.education-details {
  flex: 1;
}

.education-details h3 {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-1);
}

.education-details h4 {
  font-size: 1rem;
  color: var(--secondary-color);
  margin-bottom: var(--spacing-1);
}

.education-date {
  font-size: 0.9rem;
  color: var(--gray-600);
  margin-bottom: var(--spacing-1);
}

/* Skills Section */
.skills-container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-4);
  justify-content: space-between;
}

.skills-category {
  flex: 1;
  min-width: 300px;
}

.skills-category h3 {
  margin-bottom: var(--spacing-3);
  text-align: center;
  font-size: 1.3rem;
  color: var(--primary-color);
}

.skill-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

.skill-item {
  background-color: var(--card-bg);
  padding: var(--spacing-2);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-sm);
}

.skill-info {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-1);
  font-weight: 500;
}

.skill-bar {
  height: 8px;
  background-color: var(--gray-300);
  border-radius: 4px;
  overflow: hidden;
}

.skill-level {
  height: 100%;
  background-color: var(--primary-color);
  border-radius: 4px;
  transition: width var(--transition-slow);
}

/* Contact Section */
.contact-container {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-4);
  background-color: var(--card-bg);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.contact-info {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-4);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.contact-item i {
  font-size: 1.5rem;
  color: var(--primary-color);
}

.social-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-3);
  margin-bottom: var(--spacing-4);
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  background-color: var(--gray-200);
  border-radius: 50%;
  color: var(--primary-color);
  font-size: 1.5rem;
  transition: all var(--transition-fast);
}

body.dark-mode .social-links a {
  background-color: var(--gray-700);
}

.social-links a:hover {
  background-color: var(--primary-color);
  color: white;
  transform: translateY(-3px);
}

.contact-cta {
  margin-top: var(--spacing-4);
}

/* Footer */
footer {
  background-color: var(--gray-800);
  color: var(--light-text);
  padding: var(--spacing-3) 0;
  text-align: center;
}

footer .container {
  padding: var(--spacing-1) 0;
}