/* Portfolio Styles - Consistent Dark Theme with Unified Backgrounds */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* CSS Variables */
:root {
  --primary-cyan: #06b6d4;
  --primary-violet: #7c3aed;
  --accent-teal: #14b8a6;
  --accent-fuchsia: #d946ef;
  --emerald: #10b981;
  --rose: #f43f5e;
  --yellow: #f59e0b;
  --indigo: #6366f1;
  
  --text-primary: #ffffff;
  --text-secondary: #e2e8f0;
  --text-muted: #94a3b8;
  
  --bg-primary: #0f172a;
  --bg-secondary: rgba(15, 23, 42, 0.8);
  --bg-glass: rgba(15, 23, 42, 0.7);
  --bg-pattern: rgba(30, 41, 59, 0.3);
  --border-color: rgba(148, 163, 184, 0.15);
  --border-glow: rgba(6, 182, 212, 0.3);
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
  --shadow-glow: 0 0 30px rgba(6, 182, 212, 0.2);
  
  --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius: 1rem;
  --border-radius-sm: 0.5rem;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', sans-serif;
  line-height: 1.7;
  color: var(--text-secondary);
  background: var(--bg-primary);
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

h1 { font-size: clamp(2rem, 5vw, 4rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h4 { font-size: clamp(1rem, 2vw, 1.25rem); }
h5 { font-size: clamp(0.875rem, 1.5vw, 1.125rem); }
p { color: var(--text-secondary); }

/* Scroll Progress Bar */
#scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-cyan), var(--primary-violet));
  z-index: 1000;
  transition: width 0.1s ease;
}

/* Navigation */
#navbar {
  background: var(--bg-secondary);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
}

#navbar.scrolled {
  background: rgba(15, 23, 42, 0.95);
  box-shadow: var(--shadow-md);
}

.nav-link, .mobile-nav-link {
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition-base);
  font-size: clamp(0.875rem, 2vw, 1rem);
}

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

/* Unified Background Patterns */
.bg-hero-pattern, .bg-about-pattern, .bg-education-pattern, .bg-experience-pattern, .bg-skills-pattern, .bg-languages-pattern, .bg-contact-pattern {
  position: relative;
}

.floating-shapes {
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle at 20% 80%, rgba(6, 182, 212, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(124, 58, 237, 0.1) 0%, transparent 50%);
  animation: float 20s ease-in-out infinite;
  z-index: -1;
}

.geometric-bg {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(45deg, transparent 50%, rgba(6, 182, 212, 0.02) 50%),
    linear-gradient(-45deg, transparent 50%, rgba(124, 58, 237, 0.02) 50%);
  background-size: 30px 30px;
  animation: geometricMove 40s linear infinite;
  z-index: -1;
}

.section-bg-pattern {
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle at 30% 30%, rgba(20, 184, 166, 0.05) 0%, transparent 70%);
  background-size: 300px 300px;
  animation: patternFloat 30s ease-in-out infinite;
  z-index: -1;
}

/* Section-Specific Background Variations */
.bg-hero-pattern .floating-shapes { opacity: 0.8; }
.bg-hero-pattern .geometric-bg { opacity: 0.6; background-size: 40px 40px; }
.bg-about-pattern .section-bg-pattern { opacity: 0.5; background-image: radial-gradient(circle at 40% 60%, rgba(20, 184, 166, 0.08) 0%, transparent 60%); }
.bg-education-pattern .floating-shapes { opacity: 0.4; background-image: radial-gradient(circle at 50% 50%, rgba(124, 58, 237, 0.06) 0%, transparent 60%); }
.bg-experience-pattern .geometric-bg { opacity: 0.3; background-size: 35px 35px; background-image: linear-gradient(60deg, transparent 50%, rgba(16, 185, 129, 0.03) 50%), linear-gradient(-60deg, transparent 50%, rgba(124, 58, 237, 0.03) 50%); }
.bg-skills-pattern .section-bg-pattern { opacity: 0.5; background-image: radial-gradient(circle at 25% 75%, rgba(6, 182, 212, 0.07) 0%, transparent 65%); }
.bg-languages-pattern .floating-shapes { opacity: 0.4; background-image: radial-gradient(circle at 60% 40%, rgba(16, 185, 129, 0.06) 0%, transparent 60%); }
.bg-contact-pattern .geometric-bg { opacity: 0.35; background-size: 32px 32px; background-image: linear-gradient(30deg, transparent 50%, rgba(124, 58, 237, 0.02) 50%), linear-gradient(-30deg, transparent 50%, rgba(6, 182, 212, 0.02) 50%); }

/* Responsive Background Adjustments */
@media (max-width: 640px) {
  .floating-shapes, .geometric-bg, .section-bg-pattern {
    background-size: 200px 200px;
  }
  .bg-hero-pattern .geometric-bg { background-size: 30px 30px; }
  .bg-experience-pattern .geometric-bg { background-size: 25px 25px; }
  .bg-contact-pattern .geometric-bg { background-size: 25px 25px; }
}

@media (min-width: 1280px) {
  .floating-shapes, .section-bg-pattern { background-size: 400px 400px; }
  .geometric-bg { background-size: 50px 50px; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes geometricMove {
  0% { background-position: 0 0; }
  100% { background-position: 40px 40px; }
}

@keyframes patternFloat {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(8px); }
}

/* Section Icons */
.section-icon-wrapper {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary-cyan), var(--primary-violet));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow);
}

.section-icon {
  font-size: 1.5rem;
  color: var(--text-primary);
}

/* Buttons */
.btn-primary, .btn-secondary {
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius-sm);
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  transition: var(--transition-base);
  font-size: clamp(0.875rem, 2vw, 1rem);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-cyan), var(--primary-violet));
  color: var(--text-primary);
}

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

.btn-secondary {
  background: var(--bg-glass);
  border: 1px solid var(--border-glow);
  color: var(--text-secondary);
}

.btn-secondary:hover {
  background: rgba(30, 41, 59, 0.9);
  color: var(--primary-cyan);
}

/* Stat Cards */
.stat-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1rem;
  transition: var(--transition-base);
}

.stat-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-glow);
}

/* Highlight Cards */
.highlight-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  transition: var(--transition-base);
}

.highlight-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-glow);
}

/* Timeline */
.timeline-item {
  position: relative;
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.timeline-marker {
  position: absolute;
  top: 1rem;
  width: 1.5rem;
  height: 1.5rem;
  background: linear-gradient(135deg, var(--primary-cyan), var(--primary-violet));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow);
  z-index: 10;
}

.timeline-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1rem;
  transition: var(--transition-base);
  max-width: 28rem;
  margin: 0 auto;
}

.timeline-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-glow);
}

.education-date {
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
}

.skill-tags span {
  padding: 0.5rem 1rem;
  background: rgba(71, 85, 105, 0.5);
  color: var(--text-muted);
  border-radius: 9999px;
  font-size: 0.75rem;
}

/* Education and Certifications */
.education-card, .cert-card, .contact-item, .reference-card, .publication-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1rem;
  transition: var(--transition-base);
}

.education-card:hover, .cert-card:hover, .contact-item:hover, .reference-card:hover, .publication-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-glow);
}

.education-icon, .contact-icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  margin-right: 1rem;
}

.education-icon.blue, .contact-icon.blue { background: rgba(6, 182, 212, 0.1); color: var(--primary-cyan); }
.education-icon.purple, .contact-icon.purple { background: rgba(124, 58, 237, 0.1); color: var(--primary-violet); }
.education-icon.emerald, .contact-icon.emerald { background: rgba(16, 185, 129, 0.1); color: var(--emerald); }

/* Skills */
.skill-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1rem;
  transition: var(--transition-base);
  position: relative;
}

.skill-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-glow);
}

.progress-container {
  background: rgba(71, 85, 105, 0.3);
  border-radius: 1rem;
  height: 6px;
  overflow: hidden;
  position: relative;
}

.progress-bar {
  height: 100%;
  border-radius: 1rem;
  transition: width 1.5s ease-in-out;
  width: 0;
}

.progress-bar.blue { background: var(--primary-cyan); }
.progress-bar.purple { background: var(--primary-violet); }
.progress-bar.emerald { background: var(--emerald); }
.progress-bar.yellow { background: var(--yellow); }
.progress-bar.indigo { background: var(--indigo); }
.progress-bar.rose { background: var(--rose); }

.progress-text {
  position: absolute;
  right: 0.5rem;
  top: -1.25rem;
  font-size: 0.75rem;
  color: var(--primary-cyan);
}

/* Languages */
.language-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  text-align: center;
  transition: var(--transition-base);
}

.language-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-glow);
}

.language-icon {
  animation: float 3s ease-in-out infinite;
}

.language-name {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  font-weight: 700;
}

.language-level {
  font-weight: 600;
  color: var(--primary-cyan);
  margin-bottom: 1rem;
}

.language-progress {
  background: rgba(71, 85, 105, 0.3);
  border-radius: 1rem;
  height: 6px;
  margin-bottom: 1rem;
  overflow: hidden;
}

.language-bar {
  height: 100%;
  border-radius: 1rem;
  transition: width 1.5s ease-in-out;
  width: 0;
}

.language-bar.blue { background: var(--primary-cyan); }
.language-bar.purple { background: var(--primary-violet); }
.language-bar.emerald { background: var(--emerald); }

.service-tag {
  padding: 0.5rem 1rem;
  background: rgba(6, 182, 212, 0.1);
  color: var(--primary-cyan);
  border: 1px solid var(--border-glow);
  border-radius: 9999px;
  font-size: 0.875rem;
  transition: var(--transition-base);
}

.service-tag:hover {
  background: rgba(6, 182, 212, 0.2);
  transform: scale(1.05);
}

/* Social Links */
.social-link, .footer-social {
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  color: var(--text-secondary);
  transition: var(--transition-base);
}

.social-link:hover, .footer-social:hover {
  color: var(--primary-cyan);
  border-color: var(--border-glow);
}

/* Footer */
.footer-link {
  color: var(--text-secondary);
  transition: var(--transition-base);
}

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

/* Back to Top */
.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 2.5rem;
  height: 2.5rem;
  background: linear-gradient(135deg, var(--primary-cyan), var(--primary-violet));
  border-radius: 50%;
  color: var(--text-primary);
  font-size: 1rem;
  transition: var(--transition-base);
  opacity: 0;
  z-index: 1000;
}

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

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

/* Responsive Adjustments */
@media (max-width: 640px) {
  .section-icon-wrapper { width: 40px; height: 40px; }
  .section-icon { font-size: 1.25rem; }
  .btn-primary, .btn-secondary { padding: 0.5rem 1rem; font-size: 0.875rem; }
  .stat-card { padding: 0.75rem; }
  .highlight-card { padding: 0.75rem; }
  .education-card, .cert-card, .contact-item, .reference-card, .publication-card { padding: 0.75rem; }
  .education-icon, .contact-icon { width: 2rem; height: 2rem; font-size: 0.875rem; }
  .skill-card { padding: 0.75rem; }
  .language-card { padding: 1rem; }
  .timeline-card { padding: 0.75rem; }
  .timeline-marker { width: 1.25rem; height: 1.25rem; }
}

@media (min-width: 1280px) {
  .section-icon-wrapper { width: 60px; height: 60px; }
  .section-icon { font-size: 1.75rem; }
  .btn-primary, .btn-secondary { padding: 0.75rem 1.5rem; font-size: 1rem; }
  .stat-card, .highlight-card, .education-card, .cert-card, .contact-item, .reference-card, .publication-card { padding: 1.5rem; }
  .skill-card { padding: 1.5rem; }
  .language-card { padding: 2rem; }
  .timeline-card { padding: 1.5rem; }
}