/* Modern Portfolio CSS - Abla Ammami */

/* ===== CSS Variables (Design Tokens) ===== */
:root {
  /* Colors */
  --primary-50: #f0f9ff;
  --primary-100: #e0f2fe;
  --primary-200: #bae6fd;
  --primary-300: #7dd3fc;
  --primary-400: #38bdf8;
  --primary-500: #0ea5e9;
  --primary-600: #0284c7;
  --primary-700: #0369a1;
  --primary-800: #075985;
  --primary-900: #0c4a6e;
  
  --secondary-50: #fdf4ff;
  --secondary-100: #fae8ff;
  --secondary-200: #f3d2ff;
  --secondary-300: #e9a8ff;
  --secondary-400: #d946ef;
  --secondary-500: #c026d3;
  --secondary-600: #a21caf;
  --secondary-700: #86198f;
  --secondary-800: #701a75;
  --secondary-900: #581c87;
  
  --neutral-50: #fafafa;
  --neutral-100: #f5f5f5;
  --neutral-200: #e5e5e5;
  --neutral-300: #d4d4d4;
  --neutral-400: #a3a3a3;
  --neutral-500: #737373;
  --neutral-600: #525252;
  --neutral-700: #404040;
  --neutral-800: #262626;
  --neutral-900: #171717;
  
  --success-500: #10b981;
  --warning-500: #f59e0b;
  --error-500: #ef4444;
  
  /* Typography */
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;
  
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Spacing */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;
  --spacing-20: 5rem;
  --spacing-24: 6rem;
  --spacing-32: 8rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Border radius */
  --radius-sm: 0.25rem;
  --radius-base: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  
  /* Z-index */
  --z-dropdown: 10;
  --z-sticky: 20;
  --z-fixed: 30;
  --z-modal: 40;
  --z-tooltip: 50;
}

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

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

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--neutral-800);
  background-color: var(--neutral-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-4);
  color: var(--neutral-900);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

p {
  margin-bottom: var(--spacing-4);
  color: var(--neutral-700);
}

.lead {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-relaxed);
  color: var(--neutral-600);
}

a {
  color: var(--primary-600);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-700);
}

.company-link {
  font-weight: var(--font-weight-semibold);
  color: var(--primary-600);
  border-bottom: 1px solid var(--primary-200);
  transition: all var(--transition-fast);
}

.company-link:hover {
  color: var(--primary-700);
  border-bottom-color: var(--primary-400);
}

/* ===== Utility Classes ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.rounded-sm { border-radius: var(--radius-sm); }
.rounded { border-radius: var(--radius-base); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }
.rounded-full { border-radius: var(--radius-full); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow { box-shadow: var(--shadow-base); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

/* ===== Navigation ===== */
.navbar {
  background: rgba(255, 255, 255, 0.95) !important;
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--neutral-200);
  transition: all var(--transition-normal);
  padding: var(--spacing-4) 0 !important;
  box-shadow: var(--shadow-sm);
}

.navbar-scrolled {
  background: rgba(255, 255, 255, 0.98) !important;
  border-bottom-color: var(--neutral-300);
  box-shadow: var(--shadow-md);
}

.navbar-brand {
  text-decoration: none !important;
}

.navbar-brand .brand-text {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar-nav {
  gap: var(--spacing-2);
}

.navbar-nav .nav-link {
  font-weight: var(--font-weight-medium);
  color: var(--neutral-700) !important;
  padding: var(--spacing-2) var(--spacing-4) !important;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-decoration: none !important;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  color: var(--primary-600) !important;
  background-color: var(--primary-50) !important;
}

.navbar-toggler {
  border: 2px solid var(--neutral-300) !important;
  padding: var(--spacing-2) !important;
  border-radius: var(--radius-md) !important;
}

.navbar-toggler:focus {
  box-shadow: 0 0 0 0.2rem rgba(14, 165, 233, 0.25) !important;
}

.navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%2833, 37, 41, 0.75%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='m4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e") !important;
}

/* ===== Hero Section ===== */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 80px; /* Account for fixed navbar */
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.hero-bg-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  max-height: 100vh;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    rgba(14, 165, 233, 0.9) 0%,
    rgba(168, 85, 247, 0.85) 100%
  );
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  width: 100%;
  padding: var(--spacing-8) 0;
}

.hero-text {
  max-width: 700px;
  color: white;
}

.hero-greeting {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-2);
  color: rgba(255, 255, 255, 0.95);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-6);
  line-height: var(--line-height-tight);
  color: white;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-6);
  line-height: var(--line-height-normal);
  color: white;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.highlight {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.95));
  color: var(--neutral-900);
  padding: var(--spacing-1) var(--spacing-3);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-semibold);
  margin: 0 var(--spacing-1);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-description {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-8);
  color: rgba(255, 255, 255, 0.95);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.hero-cta {
  display: flex;
  gap: var(--spacing-4);
  flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-6);
  border: 2px solid transparent;
  border-radius: var(--radius-lg);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-base);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.btn-lg {
  padding: var(--spacing-4) var(--spacing-8);
  font-size: var(--font-size-lg);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-700), var(--primary-800));
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.1);
  color: white;
  border-color: rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border-color: rgba(255, 255, 255, 0.5);
}

/* ===== Sections ===== */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-16);
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-4);
  background: linear-gradient(135deg, var(--neutral-900), var(--neutral-700));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

/* ===== About Section ===== */
.about-section {
  padding: var(--spacing-20) 0;
  background: white;
  margin-top: 0;
}

.about-image {
  position: relative;
  margin-bottom: var(--spacing-8);
  display: flex;
  justify-content: center;
}

.about-image img {
  width: 100%;
  max-width: 400px;
  height: 500px;
  object-fit: cover;
  object-position: center top;
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
}

.about-badge {
  position: absolute;
  bottom: var(--spacing-6);
  left: var(--spacing-6);
  background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
  color: white;
  padding: var(--spacing-3) var(--spacing-5);
  border-radius: var(--radius-full);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  box-shadow: var(--shadow-lg);
}

.about-content {
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.about-stats {
  display: flex;
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-8);
}

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

.stat-item h3 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--primary-600);
  margin-bottom: var(--spacing-1);
}

.stat-item p {
  font-size: var(--font-size-sm);
  color: var(--neutral-600);
  margin: 0;
}

.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4);
  margin-top: var(--spacing-6);
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

.info-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--neutral-500);
}

.info-item span:not(.info-label),
.info-item a {
  font-weight: var(--font-weight-medium);
  color: var(--neutral-800);
}

/* ===== Experience Section ===== */
.experience-section {
  padding: var(--spacing-20) 0;
  background: var(--neutral-50);
}

.timeline-container {
  position: relative;
  max-width: 1100px;
  margin: 0 auto;
}

.timeline-line {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary-200), var(--secondary-200));
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-8);
  display: flex;
  align-items: flex-start;
}

.timeline-item:nth-child(odd) .timeline-content {
  padding-right: calc(50% + var(--spacing-10));
  margin-left: 0;
}

.timeline-item:nth-child(even) .timeline-content {
  padding-left: calc(50% + var(--spacing-10));
  margin-left: 0;
}

.timeline-dot {
  position: absolute;
  left: 50%;
  top: var(--spacing-4);
  width: 16px;
  height: 16px;
  background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
  border: 4px solid white;
  border-radius: var(--radius-full);
  transform: translateX(-50%);
  box-shadow: var(--shadow-md);
  z-index: 2;
}

.timeline-item.featured .timeline-dot {
  width: 20px;
  height: 20px;
  border-width: 5px;
}

.experience-card {
  background: white;
  border-radius: var(--radius-xl);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  border: 2px solid var(--neutral-100);
  width: 100%;
  max-width: 500px;
}

.experience-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-200);
}

.experience-card.current {
  border-color: var(--primary-300);
  background: linear-gradient(135deg, var(--primary-50), white);
}

.experience-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-4);
  flex-wrap: wrap;
  gap: var(--spacing-3);
}

.experience-company {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
  flex: 1;
}

.company-logo {
  width: 56px;
  height: 40px;
  object-fit: contain;
  border-radius: var(--radius-md);
  border: 1px solid var(--neutral-200);
  padding: var(--spacing-2);
  background: white;
  box-shadow: var(--shadow-sm);
}

.company-logo-placeholder {
  width: 56px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--neutral-200);
  background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}

.company-initial {
  color: white;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
}

.experience-company h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-1);
  color: var(--neutral-900);
}

.experience-company h4 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--primary-600);
  margin: 0;
}

.experience-period {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--neutral-600);
  background: var(--neutral-100);
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.experience-promotion {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-3);
  padding: var(--spacing-2) var(--spacing-4);
  background: linear-gradient(135deg, var(--success-500), var(--primary-600));
  border-radius: var(--radius-lg);
  color: white;
  font-size: var(--font-size-sm);
}

.promotion-badge {
  background: rgba(255, 255, 255, 0.2);
  padding: var(--spacing-1) var(--spacing-2);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.promotion-text {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

.experience-achievements {
  list-style: none;
  margin-bottom: var(--spacing-4);
}

.experience-achievements li {
  position: relative;
  padding-left: var(--spacing-5);
  margin-bottom: var(--spacing-2);
  color: var(--neutral-700);
  line-height: var(--line-height-normal);
  font-size: var(--font-size-sm);
}

.experience-achievements li:before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  background: var(--primary-500);
  border-radius: var(--radius-full);
}

.experience-achievements li strong {
  color: var(--neutral-900);
  font-weight: var(--font-weight-semibold);
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
}

.tech-tag {
  background: var(--primary-50);
  color: var(--primary-700);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  padding: var(--spacing-1) var(--spacing-3);
  border-radius: var(--radius-full);
  border: 1px solid var(--primary-200);
}

/* ===== Skills Section ===== */
.skills-section {
  padding: var(--spacing-20) 0;
  background: white;
}

.skills-tabs {
  display: flex;
  justify-content: center;
  margin-bottom: var(--spacing-12);
  background: var(--neutral-100);
  border-radius: var(--radius-xl);
  padding: var(--spacing-1);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
  gap: var(--spacing-1);
}

.skill-tab {
  flex: 1;
  padding: var(--spacing-3) var(--spacing-5);
  background: transparent;
  border: none;
  border-radius: var(--radius-lg);
  font-weight: var(--font-weight-medium);
  color: var(--neutral-600);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  text-align: center;
  font-size: var(--font-size-sm);
}

.skill-tab.active,
.skill-tab:hover {
  background: white;
  color: var(--primary-600);
  box-shadow: var(--shadow-sm);
}

.skills-content {
  position: relative;
}

.skill-category {
  display: none;
}

.skill-category.active {
  display: block;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-6);
  max-width: 1200px;
  margin: 0 auto;
}

.skill-card {
  background: var(--neutral-50);
  border: 2px solid var(--neutral-200);
  border-radius: var(--radius-xl);
  padding: var(--spacing-6);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.skill-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-300);
}

.skill-card.featured {
  background: linear-gradient(135deg, var(--primary-50), var(--secondary-50));
  border-color: var(--primary-300);
}

.skill-card.featured .skill-icon {
  background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
}

.skill-icon {
  width: 48px;
  height: 48px;
  background: var(--neutral-200);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-4);
  transition: all var(--transition-normal);
}

.skill-card h4 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-2);
  color: var(--neutral-900);
}

.skill-card p {
  color: var(--neutral-600);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-4);
}

.skill-level {
  height: 4px;
  background: var(--neutral-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.skill-bar {
  height: 100%;
  background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

/* ===== Projects Section ===== */
.projects-section {
  padding: var(--spacing-20) 0;
  background: var(--neutral-50);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-8);
}

.project-card {
  background: white;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  border: 2px solid var(--neutral-200);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-300);
}

.project-card.featured {
  grid-column: span 2;
  border-color: var(--primary-300);
}

.project-image {
  position: relative;
  height: 250px;
  overflow: hidden;
}

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

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

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.8), rgba(168, 85, 247, 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-links {
  display: flex;
  gap: var(--spacing-4);
}

.project-link {
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  backdrop-filter: blur(8px);
  border: 2px solid rgba(255, 255, 255, 0.3);
  transition: all var(--transition-fast);
}

.project-link:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.1);
  color: white;
}

.project-content {
  padding: var(--spacing-6);
}

.project-category {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--primary-600);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-2);
}

.project-content h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-3);
  color: var(--neutral-900);
}

.project-content p {
  color: var(--neutral-600);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-4);
}

/* ===== Speaking Section ===== */
.speaking-section {
  padding: var(--spacing-20) 0;
  background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
  color: white;
}

.speaking-image {
  margin-bottom: var(--spacing-8);
}

.speaking-image img {
  width: 100%;
  max-width: 500px;
  height: 400px;
  object-fit: cover;
  object-position: center;
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
}

.speaking-text h2 {
  color: white;
  margin-bottom: var(--spacing-6);
}

.speaking-text .lead {
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-6);
}

.speaking-highlight {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--spacing-5);
  margin-bottom: var(--spacing-6);
}

.speaking-highlight h4 {
  color: white;
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-3);
  font-weight: var(--font-weight-semibold);
}

.speaking-highlight p {
  color: rgba(255, 255, 255, 0.95);
  margin: 0;
  line-height: var(--line-height-relaxed);
}

.speaking-highlight strong {
  color: var(--primary-100);
  font-weight: var(--font-weight-semibold);
}

.speaking-topics {
  list-style: none;
}

.speaking-topics li {
  position: relative;
  padding-left: var(--spacing-6);
  margin-bottom: var(--spacing-3);
  color: rgba(255, 255, 255, 0.95);
  font-weight: var(--font-weight-medium);
}

.speaking-topics li:before {
  content: '✨';
  position: absolute;
  left: 0;
  top: 0;
}

/* ===== Values Section ===== */
.values-section {
  padding: var(--spacing-20) 0;
  background: var(--neutral-50);
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-6);
  max-width: 1200px;
  margin: 0 auto;
  align-items: stretch;
}

.value-card {
  text-align: center;
  padding: var(--spacing-8);
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--neutral-200);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  height: 100%;
}

.value-icon {
  width: 72px;
  height: 72px;
  background: linear-gradient(135deg, var(--primary-50), var(--secondary-50));
  border: 2px solid var(--primary-200);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-2xl);
  color: var(--primary-600);
  margin: 0 auto var(--spacing-4);
  transition: all var(--transition-normal);
}

.value-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-300);
}

.value-card:hover .value-icon {
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
}

.value-card h3 {
  font-size: var(--font-size-lg);
  margin: var(--spacing-4) 0 var(--spacing-2);
  color: var(--neutral-900);
  font-weight: var(--font-weight-semibold);
}

.value-card p {
  color: var(--neutral-600);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  margin: 0;
  flex-grow: 1;
}

/* ===== Contact Section ===== */
.contact-section {
  padding: var(--spacing-20) 0;
  background: var(--neutral-50);
}

.contact-card {
  background: white;
  border-radius: var(--radius-2xl);
  padding: var(--spacing-10);
  box-shadow: var(--shadow-xl);
  border: 2px solid var(--primary-200);
}

.contact-info {
  margin-bottom: var(--spacing-10);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-6);
  padding: var(--spacing-4);
  background: var(--neutral-50);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.contact-item:hover {
  background: var(--primary-50);
  transform: translateX(4px);
}

.contact-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
  color: white;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
  flex-shrink: 0;
}

.contact-details h4 {
  margin-bottom: var(--spacing-1);
  color: var(--neutral-900);
}

.contact-details p,
.contact-details a {
  margin: 0;
  color: var(--neutral-600);
}

.contact-message {
  text-align: center;
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  color: var(--neutral-700);
  margin-bottom: var(--spacing-8);
}

.contact-actions {
  display: flex;
  justify-content: center;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-8);
  flex-wrap: wrap;
}

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

.social-link {
  width: 48px;
  height: 48px;
  background: var(--neutral-100);
  color: var(--neutral-600);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
  transition: all var(--transition-fast);
}

.social-link:hover {
  background: var(--primary-600);
  color: white;
  transform: translateY(-2px);
}

/* ===== Footer ===== */
.footer {
  background: var(--neutral-900);
  color: var(--neutral-400);
  padding: var(--spacing-8) 0;
  text-align: center;
}

.footer-text p {
  margin: 0;
  font-size: var(--font-size-sm);
}

.heart {
  color: var(--error-500);
  animation: heartbeat 2s ease-in-out infinite;
}

@keyframes heartbeat {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-6);
  right: var(--spacing-6);
  width: 48px;
  height: 48px;
  background: var(--primary-600);
  color: white;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-fast);
  z-index: var(--z-fixed);
  opacity: 0;
  visibility: hidden;
}

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

.back-to-top:hover {
  background: var(--primary-700);
  color: white;
  transform: translateY(-2px);
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
  :root {
    --spacing-24: 4rem;
    --spacing-16: 3rem;
    --spacing-12: 2rem;
  }
  
  .hero-section {
    height: 90vh;
    text-align: center;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .about-stats {
    justify-content: center;
    gap: var(--spacing-6);
  }
  
  .info-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-3);
  }
  
  .timeline-line {
    left: var(--spacing-4);
  }
  
  .timeline-dot {
    left: var(--spacing-4);
  }
  
  .timeline-item:nth-child(odd) .timeline-content,
  .timeline-item:nth-child(even) .timeline-content {
    padding-left: var(--spacing-12);
    padding-right: 0;
  }
  
  .experience-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-2);
  }

  .experience-card {
    max-width: 100%;
    padding: var(--spacing-4);
  }

  .timeline-item {
    margin-bottom: var(--spacing-6);
  }
  
  .skills-tabs {
    flex-direction: column;
    max-width: 300px;
  }
  
  .skills-grid {
    grid-template-columns: 1fr;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .project-card.featured {
    grid-column: span 1;
  }
  
  .values-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .contact-actions {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .hero-subtitle {
    font-size: var(--font-size-lg);
  }
  
  .highlight {
    display: block;
    margin: var(--spacing-1) 0;
  }
  
  .about-stats {
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-4);
  }
  
  .values-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== Print Styles ===== */
@media print {
  .navbar,
  .hero-section,
  .back-to-top,
  .contact-section {
    display: none !important;
  }
  
  body {
    background: white !important;
    color: black !important;
  }
  
  .section-title {
    color: black !important;
  }
}