/* ==================== CSS VARIABLES ==================== */
:root {
  /* Light Mode Colors */
  --primary-color: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary-color: #f59e0b;
  --accent-color: #ec4899;
  
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-overlay: rgba(255, 255, 255, 0.9);
  
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;
  
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;
}

/* Dark Mode Variables */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: #1e293b;
  --bg-overlay: rgba(15, 23, 42, 0.9);
  
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-inverse: #1e293b;
  
  --border-color: #334155;
  --border-light: #475569;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
}

/* ==================== RESET & BASE STYLES ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ==================== TYPOGRAPHY ==================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }

p {
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
}

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

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

/* ==================== UTILITY CLASSES ==================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-title {
  position: relative;
  display: inline-block;
  margin-bottom: var(--space-lg);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  border-radius: var(--radius-sm);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

.highlight {
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: var(--text-inverse);
  border: none;
  border-radius: var(--radius-lg);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left var(--transition-slow);
}

.btn:hover::before {
  left: 100%;
}

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

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

@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 scaleIn {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-20px); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes gradient {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* AOS-like Animation Classes */
.aos-animate {
  animation-duration: 0.8s;
  animation-fill-mode: both;
}

.fade-up { animation-name: fadeInUp; }
.fade-left { animation-name: fadeInLeft; }
.fade-right { animation-name: fadeInRight; }
.scale-in { animation-name: scaleIn; }

/* ==================== NAVIGATION ==================== */
#navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: var(--bg-overlay);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  z-index: var(--z-fixed);
  transition: all var(--transition-normal);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  max-width: 1200px;
  margin: 0 auto;
}

.nav-brand {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
}

.brand-initial {
  color: var(--primary-color);
  font-size: 1.8rem;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-xl);
}

.nav-menu a {
  color: var(--text-primary);
  font-weight: 500;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: width var(--transition-fast);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 80%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.hamburger-line {
  width: 25px;
  height: 3px;
  background: var(--text-primary);
  margin: 3px 0;
  transition: all var(--transition-fast);
  border-radius: var(--radius-sm);
}

/* Dark Mode Toggle */
.theme-toggle {
  position: fixed;
  top: 50%;
  right: 20px;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all var(--transition-normal);
  z-index: var(--z-fixed);
  box-shadow: var(--shadow-lg);
}

.theme-toggle:hover {
  transform: translateY(-50%) scale(1.1);
  box-shadow: var(--shadow-xl);
}

/* ==================== AI CHAT INTEGRATION ==================== */
.ai-chat-container {
  position: fixed;
  top: 15%;
  right: 20px;
  z-index: var(--z-modal);
}

.chat-trigger {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: var(--text-inverse);
  border: none;
  border-radius: var(--radius-xl);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-lg);
  font-size: 0.875rem;
}

.chat-trigger:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.chat-trigger.active {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 2px solid var(--primary-color);
}

.chat-icon {
  font-size: 1.2rem;
}

.chat-label {
  font-weight: 700;
  letter-spacing: 0.5px;
}

.chat-window {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 380px;
  height: 500px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-20px);
  transition: all var(--transition-normal);
}

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

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-color);
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: var(--text-inverse);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.chat-header-info h3 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 700;
}

.chat-header-info p {
  margin: 0;
  font-size: 0.875rem;
  opacity: 0.9;
}

.chat-close {
  background: none;
  border: none;
  color: var(--text-inverse);
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--space-xs);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.chat-close:hover {
  background: rgba(255, 255, 255, 0.2);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.welcome-screen {
  text-align: center;
  padding: var(--space-lg);
}

.welcome-screen h4 {
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.welcome-screen p {
  margin-bottom: var(--space-lg);
  color: var(--text-secondary);
  line-height: 1.6;
}

.quick-questions {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.quick-question {
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
}

.quick-question:hover {
  background: var(--primary-color);
  color: var(--text-inverse);
  transform: translateY(-1px);
}

.chat-message {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.chat-message.user {
  flex-direction: row-reverse;
}

.message-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.chat-message.user .message-avatar {
  background: var(--primary-color);
  color: var(--text-inverse);
}

.chat-message.assistant .message-avatar {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.message-bubble {
  max-width: 80%;
  padding: var(--space-md);
  border-radius: var(--radius-lg);
  position: relative;
  word-wrap: break-word;
}

.chat-message.user .message-bubble {
  background: var(--primary-color);
  color: var(--text-inverse);
  border-bottom-right-radius: var(--radius-sm);
}

.chat-message.assistant .message-bubble {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-bottom-left-radius: var(--radius-sm);
}

.message-time {
  font-size: 0.75rem;
  opacity: 0.7;
  margin-top: var(--space-xs);
}

.typing-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border-bottom-left-radius: var(--radius-sm);
}

.typing-dots {
  display: flex;
  gap: 4px;
}

.typing-dot {
  width: 8px;
  height: 8px;
  background: var(--text-muted);
  border-radius: 50%;
  animation: pulse 1.4s ease-in-out infinite both;
}

.typing-dot:nth-child(1) { animation-delay: -0.32s; }
.typing-dot:nth-child(2) { animation-delay: -0.16s; }

.error-message {
  padding: var(--space-md);
  background: #fee2e2;
  color: #dc2626;
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  margin-bottom: var(--space-md);
}

.chat-input-area {
  padding: var(--space-lg);
  border-top: 1px solid var(--border-color);
}

.chat-input-form {
  display: flex;
  gap: var(--space-sm);
  align-items: flex-end;
}

.chat-input {
  flex: 1;
  padding: var(--space-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-primary);
  font-size: 0.875rem;
  resize: none;
  min-height: 40px;
  max-height: 80px;
  transition: border-color var(--transition-fast);
}

.chat-input:focus {
  outline: none;
  border-color: var(--primary-color);
}

.chat-send {
  width: 40px;
  height: 40px;
  background: var(--primary-color);
  color: var(--text-inverse);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all var(--transition-fast);
}

.chat-send:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.chat-send:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ==================== HERO SECTION ==================== */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  overflow: hidden;
}

.hero-background {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(236, 72, 153, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(245, 158, 11, 0.05) 0%, transparent 50%);
  animation: gradient 15s ease infinite;
  background-size: 400% 400%;
}

.hero-content {
  text-align: center;
  z-index: 2;
  max-width: 800px;
  padding: var(--space-xl);
}

.hero-greeting {
  font-size: 1.25rem;
  color: var(--primary-color);
  margin-bottom: var(--space-md);
  font-weight: 500;
}

.hero-name {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 800;
  margin-bottom: var(--space-lg);
  background: linear-gradient(135deg, var(--text-primary), var(--primary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-role {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  margin-bottom: var(--space-2xl);
  color: var(--text-secondary);
}

.role-text {
  color: var(--primary-color);
  font-weight: 600;
  position: relative;
}

.role-text::after {
  content: '|';
  animation: pulse 1s infinite;
  margin-left: 2px;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-lg) var(--space-2xl);
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: var(--text-inverse);
  border-radius: var(--radius-xl);
  font-size: 1.125rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-lg);
}

.cta-button:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-xl);
}

.cta-arrow {
  font-size: 1.5rem;
  animation: float 2s ease-in-out infinite;
}

.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
}

.mouse-icon {
  width: 30px;
  height: 50px;
  border: 2px solid var(--text-muted);
  border-radius: 15px;
  position: relative;
  display: block;
}

.mouse-wheel {
  width: 4px;
  height: 10px;
  background: var(--text-muted);
  border-radius: 2px;
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  animation: float 2s ease-in-out infinite;
}

/* ==================== ABOUT SECTION ==================== */
.about-section {
  padding: var(--space-3xl) 0;
  background: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.about-image {
  position: relative;
}

.image-wrapper {
  position: relative;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.image-wrapper::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  opacity: 0.1;
  z-index: 1;
}

.image-wrapper img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-slow);
}

.image-wrapper:hover img {
  transform: scale(1.05);
}

.about-content {
  padding: var(--space-lg);
}

.about-description {
  font-size: 1.125rem;
  line-height: 1.8;
  margin-bottom: var(--space-xl);
}

.personal-info {
  margin-bottom: var(--space-xl);
}

.info-item {
  display: flex;
  margin-bottom: var(--space-md);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--border-light);
}

.info-item dt {
  font-weight: 600;
  color: var(--primary-color);
  min-width: 120px;
}

.info-item dd {
  color: var(--text-secondary);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.stat-item {
  text-align: center;
  padding: var(--space-lg);
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal);
}

.stat-item:hover {
  transform: translateY(-5px);
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary-color);
  margin-bottom: var(--space-sm);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
}

.download-cv-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  background: linear-gradient(135deg, var(--secondary-color), #f59e0b);
  color: var(--text-inverse);
  border-radius: var(--radius-lg);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-md);
}

.download-cv-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* ==================== SKILLS SECTION ==================== */
.skills-section {
  padding: var(--space-3xl) 0;
}

.skills-categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-3xl);
}

.category-card {
  background: var(--bg-card);
  padding: var(--space-2xl);
  border-radius: var(--radius-xl);
  text-align: center;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
  border: 1px solid var(--border-color);
}

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

.category-card h3 {
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

.progress-circle {
  position: relative;
  width: 120px;
  height: 120px;
  margin: 0 auto;
}

.circle-svg {
  transform: rotate(-90deg);
}

.circle-bg {
  fill: none;
  stroke: var(--border-light);
  stroke-width: 8;
}

.circle-progress {
  fill: none;
  stroke: var(--primary-color);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: 314;
  stroke-dashoffset: 314;
  transition: stroke-dashoffset 2s ease-in-out;
}

.percentage-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-color);
}

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

.skill-item {
  background: var(--bg-card);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal);
}

.skill-item:hover {
  transform: translateY(-3px);
}

.skill-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
}

.skill-header h4 {
  margin: 0;
  color: var(--text-primary);
}

.skill-percentage {
  font-weight: 700;
  color: var(--primary-color);
}

.progress-bar {
  height: 8px;
  background: var(--border-light);
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  border-radius: var(--radius-sm);
  transition: width 2s ease-in-out;
  width: 0%;
}

/* ==================== RESUME SECTION ==================== */
.resume-section {
  padding: var(--space-3xl) 0;
  background: var(--bg-secondary);
}

.resume-tabs {
  max-width: 1000px;
  margin: 0 auto;
}

.tab-navigation {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
}

.tab-btn {
  padding: var(--space-md) var(--space-xl);
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.tab-btn.active,
.tab-btn:hover {
  background: var(--primary-color);
  color: var(--text-inverse);
  border-color: var(--primary-color);
  transform: translateY(-2px);
}

.tab-content {
  display: none;
  animation: fadeInUp 0.5s ease-in-out;
}

.tab-content.active {
  display: block;
}

.timeline {
  position: relative;
  padding-left: var(--space-2xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--primary-color), var(--accent-color));
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-2xl);
  background: var(--bg-card);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.timeline-item:hover {
  transform: translateX(10px);
  box-shadow: var(--shadow-lg);
}

.timeline-icon {
  position: absolute;
  left: -35px;
  top: var(--space-lg);
  width: 40px;
  height: 40px;
  background: var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: var(--shadow-md);
}

.timeline-date {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  background: var(--primary-color);
  color: var(--text-inverse);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.timeline-content h3 {
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.timeline-content h4 {
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.grades ul {
  list-style: none;
  padding-left: var(--space-md);
}

.grades li {
  margin-bottom: var(--space-xs);
  color: var(--text-secondary);
}

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

.award-card {
  background: var(--bg-card);
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  text-align: center;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
  border: 1px solid var(--border-color);
}

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

.award-icon {
  font-size: 3rem;
  margin-bottom: var(--space-lg);
}

.award-date {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  background: var(--accent-color);
  color: var(--text-inverse);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.award-content h3 {
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.award-content h4 {
  color: var(--primary-color);
  margin-bottom: var(--space-md);
}

.certificate-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--primary-color);
  color: var(--text-inverse);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-normal);
  margin-top: var(--space-md);
}

.certificate-link:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

/* ==================== PROJECTS SECTION ==================== */
.projects-section {
  padding: var(--space-3xl) 0;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--space-2xl);
}

.project-card {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
  border: 1px solid var(--border-color);
}

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

.project-image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/10;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

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

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

.project-links {
  display: flex;
  gap: var(--space-md);
}

.project-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: var(--primary-color);
  color: var(--text-inverse);
  border-radius: var(--radius-lg);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-normal);
}

.project-link:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

.project-content {
  padding: var(--space-xl);
}

.project-content h3 {
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.project-content p {
  margin-bottom: var(--space-lg);
  line-height: 1.7;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tech-tag {
  padding: var(--space-xs) var(--space-md);
  background: var(--primary-color);
  color: var(--text-inverse);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
}

/* ==================== BLOG SECTION ==================== */
.blog-section {
  padding: var(--space-3xl) 0;
  background: var(--bg-secondary);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-2xl);
}

.blog-card {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
  border: 1px solid var(--border-color);
}

.blog-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

.blog-image {
  aspect-ratio: 16/10;
  overflow: hidden;
}

.blog-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

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

.blog-content {
  padding: var(--space-xl);
}

.blog-date {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  background: var(--secondary-color);
  color: var(--text-inverse);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.blog-content h3 {
  margin-bottom: var(--space-md);
}

.blog-content h3 a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.blog-content h3 a:hover {
  color: var(--primary-color);
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--primary-color);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.read-more:hover {
  color: var(--primary-dark);
  transform: translateX(5px);
}

/* ==================== HIRE SECTION ==================== */
.hire-section {
  padding: var(--space-3xl) 0;
  position: relative;
  text-align: center;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: var(--text-inverse);
  overflow: hidden;
}

.hire-background {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
  animation: gradient 15s ease infinite;
  background-size: 400% 400%;
}

.hire-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.hire-content h2 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: var(--space-lg);
}

.hire-content p {
  font-size: 1.125rem;
  line-height: 1.8;
  margin-bottom: var(--space-2xl);
  color: rgba(255, 255, 255, 0.9);
}

.hire-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-lg) var(--space-2xl);
  background: var(--text-inverse);
  color: var(--primary-color);
  border-radius: var(--radius-xl);
  font-size: 1.125rem;
  font-weight: 700;
  text-decoration: none;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-xl);
}

.hire-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

/* ==================== CONTACT SECTION ==================== */
.contact-section {
  padding: var(--space-3xl) 0;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-3xl);
}

.contact-card {
  background: var(--bg-card);
  padding: var(--space-2xl);
  border-radius: var(--radius-xl);
  text-align: center;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
  border: 1px solid var(--border-color);
}

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

.contact-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-lg);
  display: block;
}

.contact-card h3 {
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

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

.contact-card a:hover {
  color: var(--primary-color);
}

.contact-image {
  text-align: center;
  margin-top: var(--space-2xl);
}

.contact-image img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

/* ==================== FOOTER ==================== */
.footer {
  background: var(--bg-secondary);
  padding: var(--space-3xl) 0 var(--space-xl);
  border-top: 1px solid var(--border-color);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-section h3 {
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

.footer-section p {
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

.social-links {
  display: flex;
  gap: var(--space-md);
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--primary-color);
  color: var(--text-inverse);
  border-radius: 50%;
  text-decoration: none;
  transition: all var(--transition-normal);
}

.social-links a:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.contact-info {
  font-style: normal;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.contact-icon {
  font-size: 1.2rem;
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
}

/* ==================== BACK TO TOP ==================== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--primary-color);
  color: var(--text-inverse);
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: var(--z-fixed);
  box-shadow: var(--shadow-lg);
}

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

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-3px);
}

/* ==================== LOADING SCREEN ==================== */
.loading-screen {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity var(--transition-slow);
}

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

.loader {
  text-align: center;
}

.loader-circle {
  width: 60px;
  height: 60px;
  border: 4px solid var(--border-light);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--space-lg);
}

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

.loader p {
  color: var(--text-secondary);
  font-weight: 500;
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 768px) {
  .ai-chat-container {
    top: 10%;
    right: 10px;
  }
  
  .chat-window {
    width: 320px;
    height: 450px;
  }
  
  .nav-menu {
    position: fixed;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--bg-overlay);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: var(--space-xl);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .nav-toggle.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .nav-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
  }
  
  .nav-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
  
  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .skills-categories {
    grid-template-columns: 1fr;
  }
  
  .tab-navigation {
    flex-direction: column;
    align-items: center;
  }
  
  .timeline {
    padding-left: var(--space-lg);
  }
  
  .timeline::before {
    left: 10px;
  }
  
  .timeline-icon {
    left: -15px;
    width: 30px;
    height: 30px;
    font-size: 1rem;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .blog-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .theme-toggle {
    right: 10px;
    width: 40px;
    height: 40px;
  }
  
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 480px) {
  .ai-chat-container {
    top: 8%;
    right: 5px;
  }
  
  .chat-window {
    width: 300px;
    height: 400px;
  }
  
  .container {
    padding: 0 var(--space-md);
  }
  
  .hero-content {
    padding: var(--space-lg);
  }
  
  .section-header {
    margin-bottom: var(--space-2xl);
  }
  
  .about-section,
  .skills-section,
  .resume-section,
  .projects-section,
  .blog-section,
  .contact-section {
    padding: var(--space-2xl) 0;
  }
  
  .hire-section {
    padding: var(--space-2xl) 0;
  }
  
  .project-links {
    flex-direction: column;
  }
  
  .awards-grid {
    grid-template-columns: 1fr;
  }
}

/* ==================== PRINT STYLES ==================== */
@media print {
  .nav-toggle,
  .theme-toggle,
  .back-to-top,
  .loading-screen,
  .ai-chat-container {
    display: none !important;
  }
  
  body {
    background: white !important;
    color: black !important;
  }
  
  .hero-section {
    min-height: auto;
    padding: 2rem 0;
  }
  
  section {
    break-inside: avoid;
    page-break-inside: avoid;
  }
}

/* ==================== ACCESSIBILITY ==================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus,
input:focus,
textarea:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
  }
}

.project-link.disabled {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.2rem;
  background-color: #ffcc00;
  color: #000;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: not-allowed;
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transition: all 0.25s ease;
}

.project-link.disabled:hover {
  transform: scale(1.03);
  opacity: 0.95;
}
.project-link.disabled {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 1.3rem;
  background-color: #ffe066;
  color: #333;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: not-allowed;
  text-decoration: none;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
  position: relative;
}

/* Spinning loader circle */
.loader-circle {
  width: 18px;
  height: 18px;
  border: 3px solid #00000022;
  border-top: 3px solid #333;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  display: inline-block;
}

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