:root {
  --primary-color: #00f5ff;
  --secondary-color: #ff6b6b;
  --accent-color: #4ecdc4;
  --text-primary: #ffffff;
  --text-secondary: #e0e6ed;
  --text-muted: #9ca3af;
  --text-dark: #111827;

  --bg-primary: #0a0f1c;
  --bg-secondary: #1a1f2e;
  --bg-tertiary: #2d3748;

  --surface-primary: rgba(255, 255, 255, 0.05);
  --surface-secondary: rgba(255, 255, 255, 0.1);
  --surface-hover: rgba(255, 255, 255, 0.15);
  --surface-active: rgba(255, 255, 255, 0.2);

  --border-subtle: rgba(255, 255, 255, 0.1);
  --border-default: rgba(255, 255, 255, 0.2);
  --border-strong: rgba(255, 255, 255, 0.3);

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --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);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 30px rgba(0, 245, 255, 0.3);

  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-dark: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
  --gradient-bg: radial-gradient(ellipse at top, #1e3a8a 0%, #0f172a 50%, #000000 100%);

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-3xl: 2rem;

  --transition-fast: 0.15s ease;
  --transition-default: 0.3s ease;
  --transition-slow: 0.5s ease;

  --blur-sm: 4px;
  --blur-md: 12px;
  --blur-lg: 24px;
  --blur-xl: 40px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--gradient-bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(600px circle at 50% 200px, rgba(0, 245, 255, 0.1) 0%, transparent 40%),
    radial-gradient(800px circle at 80% 60%, rgba(255, 107, 107, 0.1) 0%, transparent 40%),
    radial-gradient(400px circle at 20% 80%, rgba(78, 205, 196, 0.1) 0%, transparent 40%);
  pointer-events: none;
  z-index: -1;
}

/* Matrix Code Rain */
.matrix-rain {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}

.matrix-column {
  position: absolute;
  top: -100vh;
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  line-height: 14px;
  color: var(--primary-color);
  opacity: 0.7;
  animation: matrix-fall linear infinite;
}

@keyframes matrix-fall {
  0% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(100vh); opacity: 0; }
}

/* Cursor Trail */
.cursor-trail {
  position: fixed;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--primary-color) 0%, transparent 70%);
  pointer-events: none;
  z-index: 9999;
  opacity: 0.8;
  transition: opacity 0.3s ease;
}

.cursor-trail.active {
  opacity: 1;
  box-shadow: 0 0 20px var(--primary-color);
}

/* Constellation */
.constellation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 2;
}

.star {
  position: absolute;
  width: 2px;
  height: 2px;
  background: var(--primary-color);
  border-radius: 50%;
  opacity: 0.8;
  transition: all 0.3s ease;
}

.star.active {
  transform: scale(3);
  box-shadow: 0 0 10px var(--primary-color);
}

.connection-line {
  position: absolute;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
  opacity: 0.3;
  transition: opacity 0.3s ease;
}

/* Glitch Effect */
.glitch {
  position: relative;
  animation: glitch 2s infinite;
}

.glitch::before,
.glitch::after {
  content: attr(data-text);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.8;
}

.glitch::before {
  animation: glitch-1 0.5s infinite;
  color: var(--secondary-color);
  z-index: -1;
}

.glitch::after {
  animation: glitch-2 0.5s infinite;
  color: var(--accent-color);
  z-index: -2;
}

@keyframes glitch {
  0%, 100% { transform: translate(0); }
  20% { transform: translate(-2px, 2px); }
  40% { transform: translate(-2px, -2px); }
  60% { transform: translate(2px, 2px); }
  80% { transform: translate(2px, -2px); }
}

@keyframes glitch-1 {
  0%, 100% { transform: translate(0); }
  20% { transform: translate(2px, -2px); }
  40% { transform: translate(-2px, 2px); }
  60% { transform: translate(-2px, -2px); }
  80% { transform: translate(2px, 2px); }
}

@keyframes glitch-2 {
  0%, 100% { transform: translate(0); }
  20% { transform: translate(-2px, 2px); }
  40% { transform: translate(2px, -2px); }
  60% { transform: translate(2px, 2px); }
  80% { transform: translate(-2px, -2px); }
}

/* Hologram Effect */
.hologram {
  position: relative;
  background: linear-gradient(45deg, transparent 30%, rgba(0, 245, 255, 0.1) 50%, transparent 70%);
  background-size: 20px 20px;
  animation: hologram-scan 2s linear infinite;
}

@keyframes hologram-scan {
  0% { background-position: 0 0; }
  100% { background-position: 20px 20px; }
}

.hologram::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(0, 245, 255, 0.1), transparent);
  animation: hologram-sweep 3s ease-in-out infinite;
}

@keyframes hologram-sweep {
  0%, 100% { transform: translateX(-100%); }
  50% { transform: translateX(100%); }
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: all var(--transition-default);
  position: relative;
}

a::before {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: width var(--transition-default);
}

a:hover::before {
  width: 100%;
}

a:hover {
  color: var(--text-primary);
  text-shadow: 0 0 8px var(--primary-color);
}

/* NAVBAR */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 15, 28, 0.8);
  backdrop-filter: blur(var(--blur-lg));
  -webkit-backdrop-filter: blur(var(--blur-lg));
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition-default);
}

.navbar.scrolled {
  background: rgba(10, 15, 28, 0.95);
  box-shadow: var(--shadow-xl);
}

.navbar-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
}

.navbar-brand {
  text-align: center;
}

.navbar-brand h1 {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-xs);
  letter-spacing: -0.025em;
}

.navbar-brand .subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-weight: 500;
  opacity: 0.9;
}

.navbar-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  justify-content: center;
}

.nav-link {
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-default);
  position: relative;
  overflow: hidden;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-link::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left var(--transition-slow);
}

.nav-link:hover::before {
  left: 100%;
}

.nav-link:hover {
  background: var(--surface-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.navbar-actions {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-default);
  border: none;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: var(--text-dark);
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 40px rgba(0, 245, 255, 0.5);
  color: var(--text-dark);
}

.btn-secondary {
  background: var(--surface-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-default);
}

.btn-secondary:hover {
  background: var(--surface-hover);
  transform: translateY(-2px);
  border-color: var(--primary-color);
  box-shadow: var(--shadow-lg);
}

/* HERO SECTION */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}

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

.hero-title {
  font-size: 4rem;
  font-weight: 800;
  margin-bottom: var(--spacing-lg);
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
  letter-spacing: -0.025em;
  animation: slideInUp 1s ease-out;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-2xl);
  opacity: 0.9;
  animation: slideInUp 1s ease-out 0.2s both;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
  animation: slideInUp 1s ease-out 0.4s both;
}

@keyframes slideInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* SECTIONS */
.section {
  padding: var(--spacing-3xl) var(--spacing-xl);
  max-width: 1000px;
  margin: 0 auto;
  position: relative;
}

.section-title {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: var(--spacing-2xl);
  text-align: center;
  position: relative;
  display: inline-block;
  width: 100%;
}

.section-title::before {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  border-radius: var(--radius-sm);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -16px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 2px;
  background: var(--secondary-color);
  border-radius: var(--radius-sm);
}

/* ABOUT SECTION */
.about-content {
  display: grid;
  gap: var(--spacing-3xl);
  align-items: flex-start;
}

.about-profile-container {
  display: flex;
  justify-content: center;
  margin-bottom: var(--spacing-2xl);
}

.about-profile-card {
  background: var(--surface-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-3xl);
  padding: var(--spacing-2xl);
  text-align: center;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(var(--blur-md));
  -webkit-backdrop-filter: blur(var(--blur-md));
  transition: all var(--transition-default);
  max-width: 400px;
  width: 100%;
}

.about-profile-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color), var(--secondary-color));
  opacity: 0;
  transition: opacity var(--transition-default);
}

.about-profile-card:hover::before { opacity: 1; }

.about-profile-card:hover {
  transform: translateY(-8px);
  background: var(--surface-secondary);
  border-color: var(--border-default);
  box-shadow: var(--shadow-2xl);
}

.profile-image-wrapper {
  position: relative;
  width: 150px;
  height: 150px;
  margin: 0 auto var(--spacing-xl);
}

.profile-image {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--primary-color);
  transition: all var(--transition-default);
  position: relative;
  z-index: 2;
}

.profile-glow {
  position: absolute;
  top: -4px;
  left: -4px;
  right: -4px;
  bottom: -4px;
  border-radius: 50%;
  background: linear-gradient(45deg, var(--primary-color), var(--accent-color), var(--secondary-color));
  opacity: 0;
  filter: blur(8px);
  transition: opacity var(--transition-default);
  z-index: 1;
}

.about-profile-card:hover .profile-glow { opacity: 0.6; }

.about-profile-card:hover .profile-image {
  transform: scale(1.05);
  border-color: var(--accent-color);
}

.profile-info { text-align: center; }

.profile-name {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.profile-title {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  font-weight: 600;
}

.profile-stats {
  display: flex;
  justify-content: space-around;
  gap: var(--spacing-md);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--spacing-sm);
  border-radius: var(--radius-lg);
  background: var(--surface-secondary);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-default);
  flex: 1;
}

.stat-item:hover {
  transform: translateY(-2px);
  background: var(--surface-hover);
  border-color: var(--primary-color);
}

.stat-number {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--primary-color);
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.about-text-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.about-text {
  font-size: 1.2rem;
  line-height: 1.8;
  color: var(--text-secondary);
  position: relative;
  padding-left: var(--spacing-lg);
}

.about-text::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--primary-color), var(--accent-color));
  border-radius: var(--radius-sm);
}

/* ARTICLES SECTION */
.articles-grid {
  display: flex;
  justify-content: center;
  margin-top: var(--spacing-xl);
}

.article-card {
  background: var(--surface-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-2xl);
  transition: all var(--transition-default);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(var(--blur-md));
  -webkit-backdrop-filter: blur(var(--blur-md));
  max-width: 600px;
  width: 100%;
}

.article-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  transform: scaleX(0);
  transition: transform var(--transition-default);
}

.article-card:hover::before { transform: scaleX(1); }

.article-card:hover {
  transform: translateY(-8px);
  background: var(--surface-secondary);
  border-color: var(--border-default);
  box-shadow: var(--shadow-2xl);
}

.article-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.article-date { font-weight: 600; }

.article-read-time {
  background: var(--surface-secondary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  border: 1px solid var(--border-subtle);
}

.article-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  line-height: 1.4;
  transition: color var(--transition-default);
}

.article-card:hover .article-title { color: var(--primary-color); }

.article-excerpt {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
}

.article-tag {
  background: var(--surface-secondary);
  color: var(--primary-color);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-lg);
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-default);
}

.article-tag:hover {
  background: var(--primary-color);
  color: var(--text-dark);
  transform: translateY(-2px);
}

.article-footer {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  margin-top: auto;
}

.article-link {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-default);
  position: relative;
  border-bottom: 1px solid var(--primary-color);
  padding-bottom: 2px;
}

.article-link::after {
  content: ' →';
  transition: transform var(--transition-default);
}

.article-link:hover::after { transform: translateX(4px); }

.article-platform {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.platform-icon { font-size: 1rem; }

/* EDUCATION TIMELINE */
.education-timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-xl) 0;
}

.education-timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--primary-color), var(--accent-color), var(--secondary-color));
  border-radius: var(--radius-sm);
  transform: translateX(-50%);
  box-shadow: 0 0 20px rgba(0, 245, 255, 0.3);
}

.timeline-item {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-3xl);
  position: relative;
  transition: all var(--transition-default);
}

.timeline-item:hover { transform: scale(1.02); }

.timeline-item:nth-child(odd) { flex-direction: row; }
.timeline-item:nth-child(even) { flex-direction: row-reverse; }

.timeline-marker {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0 var(--spacing-xl);
}

.timeline-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--surface-primary);
  border: 3px solid var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  transition: all var(--transition-default);
  box-shadow: 0 0 20px rgba(0, 245, 255, 0.3);
  overflow: hidden;
}

.timeline-logo {
  width: 45px;
  height: 45px;
  object-fit: contain;
  filter: brightness(1.2) contrast(1.1);
  transition: all var(--transition-default);
}

.timeline-item:hover .timeline-icon {
  transform: scale(1.1);
  box-shadow: 0 0 30px rgba(0, 245, 255, 0.5);
}

.timeline-item[data-level="master-current"] .timeline-icon {
  border-color: var(--primary-color);
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
}

.timeline-item[data-level="master-completed"] .timeline-icon {
  border-color: var(--accent-color);
  background: linear-gradient(135deg, var(--accent-color), var(--secondary-color));
}

.timeline-item[data-level="bachelor"] .timeline-icon {
  border-color: var(--secondary-color);
  background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
}

.timeline-year {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 600;
  background: var(--surface-secondary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  white-space: nowrap;
}

.timeline-content {
  flex: 1;
  background: var(--surface-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-xl);
  position: relative;
  backdrop-filter: blur(var(--blur-md));
  -webkit-backdrop-filter: blur(var(--blur-md));
  transition: all var(--transition-default);
}

.timeline-content::before {
  content: '';
  position: absolute;
  top: 50%;
  width: 0;
  height: 0;
  border: 15px solid transparent;
  transform: translateY(-50%);
}

.timeline-item:nth-child(odd) .timeline-content::before {
  left: -30px;
  border-right-color: var(--surface-primary);
}

.timeline-item:nth-child(even) .timeline-content::before {
  right: -30px;
  border-left-color: var(--surface-primary);
}

.timeline-item:hover .timeline-content {
  background: var(--surface-secondary);
  border-color: var(--border-default);
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
}

.timeline-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 var(--spacing-sm) 0;
}

.timeline-program {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--primary-color);
  margin: 0 0 var(--spacing-sm) 0;
}

.timeline-university {
  font-size: 1rem;
  color: var(--text-secondary);
  margin: 0 0 var(--spacing-md) 0;
}

.timeline-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-lg);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.timeline-badge.current {
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: var(--text-dark);
  animation: pulse 2s infinite;
}

.timeline-badge.completed {
  background: var(--surface-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-default);
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0, 245, 255, 0.7); }
  50% { box-shadow: 0 0 0 10px rgba(0, 245, 255, 0); }
}

/* CARD SYSTEM */
.cards-grid {
  display: grid;
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.card {
  background: var(--surface-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-2xl);
  transition: all var(--transition-default);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(var(--blur-md));
  -webkit-backdrop-filter: blur(var(--blur-md));
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  transform: scaleX(0);
  transition: transform var(--transition-default);
}

.card:hover::before { transform: scaleX(1); }

.card:hover {
  transform: translateY(-8px);
  background: var(--surface-secondary);
  border-color: var(--border-default);
  box-shadow: var(--shadow-2xl);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-lg);
  gap: var(--spacing-md);
}

.card-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.4;
  flex: 1;
}

.card-toggle {
  font-size: 1.5rem;
  color: var(--text-muted);
  transition: all var(--transition-default);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--surface-secondary);
  border: 1px solid var(--border-subtle);
}

.card-summary {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
}

.card-details {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease-out, opacity 0.3s ease-out;
  opacity: 0;
}

.card-details ul { list-style: none; padding: 0; }

.card-details li {
  padding: var(--spacing-sm) 0;
  padding-left: var(--spacing-lg);
  position: relative;
  color: var(--text-secondary);
  line-height: 1.7;
}

.card-details li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--primary-color);
  font-weight: 600;
}

.card-details a {
  color: var(--accent-color);
  font-weight: 600;
}

.card.open .card-details {
  max-height: 1000px;
  opacity: 1;
}

.card.open .card-toggle {
  transform: rotate(45deg);
  background: var(--primary-color);
  color: var(--text-dark);
  border-color: var(--primary-color);
}

/* SKILLS SECTION */
.skills-container {
  display: grid;
  gap: var(--spacing-2xl);
  margin-top: var(--spacing-xl);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
}

.skill-item {
  background: var(--surface-primary);
  padding: var(--spacing-lg);
  border-radius: var(--radius-xl);
  text-align: center;
  transition: all var(--transition-default);
  border: 1px solid var(--border-subtle);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.skill-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(0, 245, 255, 0.1), transparent);
  transition: left var(--transition-slow);
}

.skill-item:hover::before { left: 100%; }

.skill-item:hover {
  transform: translateY(-4px);
  background: var(--surface-secondary);
  border-color: var(--primary-color);
  box-shadow: var(--shadow-lg);
  color: var(--text-primary);
}

.skill-item:nth-child(3n+1):hover { box-shadow: 0 0 20px rgba(0, 245, 255, 0.3); }
.skill-item:nth-child(3n+2):hover { box-shadow: 0 0 20px rgba(255, 107, 107, 0.3); }
skill-item:nth-child(3n+3):hover { box-shadow: 0 0 20px rgba(78, 205, 196, 0.3); }

/* CONTACT SECTION (FIXED CENTERING) */
.contact-content {
  text-align: center;
  width: 100%;
  max-width: 1000px; /* was 600px */
  margin: 0 auto;
}

.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 320px));
  justify-content: center;
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
  width: 100%;
}

.contact-item {
  width: 100%;
  max-width: 320px;
  background: var(--surface-primary);
  padding: var(--spacing-xl);
  border-radius: var(--radius-2xl);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-default);
  text-align: center;
}

.contact-item:hover {
  transform: translateY(-4px);
  background: var(--surface-secondary);
  border-color: var(--border-default);
  box-shadow: var(--shadow-xl);
}

.contact-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-sm);
}

.contact-value {
  font-size: 1.2rem;
  color: var(--text-primary);
  font-weight: 600;
}

.contact-value a {
  color: var(--primary-color);
  font-weight: 600;
}

/* FOOTER */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: var(--spacing-2xl) var(--spacing-xl);
  text-align: center;
  margin-top: var(--spacing-3xl);
}

.footer-content {
  max-width: 600px;
  margin: 0 auto;
  color: var(--text-muted);
}

/* ANIMATIONS */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease-out;
}

.fade-in.visible { opacity: 1; transform: translateY(0); }

.slide-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: all 0.8s ease-out;
}

.slide-in-left.visible { opacity: 1; transform: translateX(0); }

.slide-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: all 0.8s ease-out;
}

.slide-in-right.visible { opacity: 1; transform: translateX(0); }

.scale-in {
  opacity: 0;
  transform: scale(0.9);
  transition: all 0.8s ease-out;
}

.scale-in.visible { opacity: 1; transform: scale(1); }

/* RESPONSIVE DESIGN */
@media (max-width: 430px) {
  .navbar-container {
    padding: var(--spacing-sm) var(--spacing-md);
    gap: var(--spacing-sm);
  }

  .navbar-brand h1 {
    font-size: 1.5rem;
    margin-bottom: 0;
  }

  .navbar-brand .subtitle {
    font-size: 0.85rem;
    margin-bottom: var(--spacing-xs);
  }

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

  .nav-link {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.85rem;
    min-height: 32px;
  }

  .navbar-actions {
    flex-direction: row;
    gap: var(--spacing-xs);
    width: 100%;
  }

  .btn {
    width: 50%;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.85rem;
    min-height: 32px;
  }

  .hero { padding-top: 80px; }

  .hero-title { font-size: 2.2rem; }
  .hero-subtitle { font-size: 1.1rem; }

  .hero-cta {
    flex-direction: row;
    gap: var(--spacing-sm);
  }

  .hero-cta .btn {
    width: auto;
    flex: 1;
  }

  .section { padding: var(--spacing-2xl) var(--spacing-md); }
  .section-title { font-size: 2rem; }

  .card { padding: var(--spacing-lg); }
  .card-title { font-size: 1.2rem; }

  .about-text { font-size: 1.1rem; }

  .about-profile-card {
    padding: var(--spacing-lg);
    max-width: 350px;
  }

  .profile-image-wrapper {
    width: 120px;
    height: 120px;
    margin-bottom: var(--spacing-lg);
  }

  .profile-name { font-size: 1.5rem; }

  .profile-title {
    font-size: 1rem;
    margin-bottom: var(--spacing-lg);
  }

  .profile-stats {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .stat-item {
    flex-direction: row;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .stat-number {
    font-size: 1.2rem;
    margin-bottom: 0;
  }

  .stat-label { font-size: 0.8rem; }

  .skills-grid {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-sm);
  }

  .skill-item { padding: var(--spacing-md); }

  .articles-grid { justify-content: center; }

  .article-card {
    padding: var(--spacing-lg);
    max-width: 100%;
    margin: 0 var(--spacing-sm);
  }

  .article-title { font-size: 1.3rem; }
  .article-excerpt { font-size: 0.95rem; }

  .article-tags { margin-bottom: var(--spacing-lg); }

  .article-tag {
    font-size: 0.75rem;
    padding: var(--spacing-xs);
  }

  .article-footer {
    justify-content: flex-start;
    align-items: flex-start;
  }

  .education-timeline { padding: var(--spacing-lg) 0; }

  .education-timeline::before {
    left: 30px;
    transform: none;
  }

  .timeline-item {
    flex-direction: row !important;
    align-items: flex-start;
  }

  .timeline-marker {
    margin: 0 var(--spacing-md) 0 0;
    min-width: 60px;
  }

  .timeline-icon {
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
  }

  .timeline-logo {
    width: 30px;
    height: 30px;
  }

  .timeline-year {
    font-size: 0.75rem;
    padding: var(--spacing-xs);
  }

  .timeline-content { padding: var(--spacing-lg); }

  .timeline-content::before {
    left: -15px !important;
    right: auto !important;
    border-right-color: var(--surface-primary) !important;
    border-left-color: transparent !important;
  }

  .timeline-title { font-size: 1.2rem; }
  .timeline-program { font-size: 1rem; }
  .timeline-university { font-size: 0.9rem; }
}

@media (max-width: 768px) and (min-width: 431px) {
  .hero-title { font-size: 3rem; }
  .section-title { font-size: 2.5rem; }
  .navbar-actions { gap: var(--spacing-sm); }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .navbar-container {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  .navbar-brand { text-align: left; }
  .navbar-nav { order: 2; }
  .navbar-actions { order: 3; }

  .hero-cta { flex-direction: row; }

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

  .skills-grid { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }

  /* keep contact centered */
  .contact-info {
    grid-template-columns: repeat(auto-fit, minmax(260px, 320px));
    justify-content: center;
  }
}

@media (min-width: 1025px) {
  .navbar-container {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) var(--spacing-2xl);
  }

  .navbar-brand {
    text-align: left;
    display: flex;
    align-items: center;
    gap: var(--spacing-2xl);
  }

  .navbar-brand h1 { font-size: 2.5rem; }
  .navbar-brand .subtitle { font-size: 1.1rem; }

  .navbar-nav { order: 2; }
  .navbar-actions { order: 3; }

  .hero-title { font-size: 4.5rem; }
  .hero-subtitle { font-size: 1.6rem; }

  .section { padding: var(--spacing-3xl) var(--spacing-2xl); }
  .section-title { font-size: 3.5rem; }

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

  .skills-grid { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }

  /* IMPORTANT: override the old 3-column stretch */
  .contact-info {
    grid-template-columns: repeat(auto-fit, minmax(260px, 320px));
    justify-content: center;
  }
}

@media (min-width: 1200px) {
  .cards-grid {
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  }
}