/* ============================================
   STIVEN NTOKTOROV PORTFOLIO - FINTECH EDITION
   Dark Theme with Neon Accents
   ============================================ */

/* ===== FONTS ===== */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=JetBrains+Mono:wght@300;400;500;600&family=Outfit:wght@300;400;500;600;700;800&display=swap');

/* ===== CSS VARIABLES ===== */
:root {
  /* Colors - Dark FinTech Theme (Teal/Cyan based on network bg) */
  --bg-primary: #0a1014;
  --bg-secondary: #0d1418;
  --bg-card: #111a1f;
  --bg-card-hover: #162025;
  
  /* Accent Colors - Teal/Cyan + Coral accent */
  --accent-primary: #00e5cc;
  --accent-secondary: #00b4d8;
  --accent-tertiary: #ff6b7a;
  --accent-success: #00e5cc;
  --accent-warning: #ffaa00;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #00e5cc 0%, #00b4d8 100%);
  --gradient-secondary: linear-gradient(135deg, #00b4d8 0%, #ff6b7a 100%);
  --gradient-dark: linear-gradient(180deg, #0a1014 0%, #0d1418 100%);
  --gradient-glow: radial-gradient(ellipse at center, rgba(0, 229, 204, 0.12) 0%, transparent 70%);
  
  /* Text Colors */
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-muted: #6a6a7a;
  
  /* Borders */
  --border-color: rgba(0, 229, 204, 0.08);
  --border-glow: rgba(0, 229, 204, 0.3);
  
  /* Typography */
  --font-display: 'Outfit', sans-serif;
  --font-body: 'Space Grotesk', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  /* Spacing */
  --nav-height: 80px;
  --container-max: 1400px;
  --section-padding: 120px;
  
  /* Effects */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-glow: 0 0 40px rgba(0, 229, 204, 0.3);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
}

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

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

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Network Background Effect */
.bg-network {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('../assets/images/bg-network.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.15;
  pointer-events: none;
  z-index: -2;
}

/* Background Effect */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    var(--gradient-glow),
    radial-gradient(ellipse at 80% 20%, rgba(0, 180, 216, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 20% 80%, rgba(255, 107, 122, 0.04) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

/* Grid Lines Background */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: -1;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--accent-primary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-secondary);
}

/* ===== NAVIGATION ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background: rgba(10, 10, 15, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-container {
  width: 100%;
  max-width: var(--container-max);
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.nav-logo-icon {
  width: 45px;
  height: 45px;
  background: var(--gradient-primary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--bg-primary);
}

.nav-logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.4rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-link {
  position: relative;
  padding: 10px 20px;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 8px;
  transition: var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
  color: var(--accent-primary);
  background: rgba(0, 217, 255, 0.1);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: var(--accent-primary);
  border-radius: 2px;
}

.nav-cta {
  padding: 12px 28px;
  background: var(--gradient-primary);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--bg-primary);
  text-decoration: none;
  border-radius: 10px;
  transition: var(--transition-fast);
  box-shadow: 0 4px 20px rgba(0, 217, 255, 0.3);
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(0, 217, 255, 0.4);
}

/* Mobile Menu Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 10px;
}

.nav-toggle span {
  width: 25px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition-fast);
}

/* ===== MAIN CONTAINER ===== */
.main {
  padding-top: var(--nav-height);
  min-height: 100vh;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 40px;
}

.section {
  padding: var(--section-padding) 0;
}

/* ===== TYPOGRAPHY ===== */
.heading-xl {
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.heading-lg {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
}

.heading-md {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 600;
  line-height: 1.3;
}

.heading-sm {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.4;
}

.text-lg {
  font-size: 1.25rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-accent {
  color: var(--accent-primary);
}

/* ===== SECTION HEADER ===== */
.section-header {
  text-align: center;
  margin-bottom: 80px;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(0, 229, 204, 0.1);
  border: 1px solid rgba(0, 229, 204, 0.25);
  border-radius: 50px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-primary);
  margin-bottom: 20px;
}

.section-label svg {
  width: 16px;
  height: 16px;
}

.section-label::before {
  display: none;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
}

.section-title {
  margin-bottom: 20px;
}

.section-description {
  max-width: 600px;
  margin: 0 auto;
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 32px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  transition: var(--transition-medium);
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--bg-primary);
  box-shadow: 0 4px 25px rgba(0, 217, 255, 0.35);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 40px rgba(0, 217, 255, 0.5);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--accent-primary);
  background: rgba(0, 217, 255, 0.1);
}

.btn-icon {
  width: 50px;
  height: 50px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  transition: var(--transition-fast);
}

.btn-icon:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateY(-2px);
}

/* ===== CARDS ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 32px;
  transition: var(--transition-medium);
}

.card:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  transform: translateY(-5px);
  box-shadow: var(--shadow-glow);
}

/* ===== TECH STACK LOGOS ===== */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 20px;
}

.tech-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 24px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  transition: var(--transition-medium);
  cursor: default;
}

.tech-item:hover {
  border-color: var(--accent-primary);
  background: var(--bg-card-hover);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 217, 255, 0.2);
}

.tech-item img,
.tech-item i {
  width: 48px;
  height: 48px;
  object-fit: contain;
  filter: grayscale(20%);
  transition: var(--transition-fast);
}

.tech-item:hover img,
.tech-item:hover i {
  filter: grayscale(0%);
  transform: scale(1.1);
}

.tech-item span {
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: center;
  font-weight: 500;
}

.tech-item:hover span {
  color: var(--text-primary);
}

/* ===== STATS ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.stat-item {
  text-align: center;
  padding: 30px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  transition: var(--transition-medium);
}

.stat-item:hover {
  border-color: var(--accent-primary);
  transform: translateY(-5px);
}

.stat-number {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-top: 8px;
}

/* ===== TAGS ===== */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag {
  padding: 6px 14px;
  background: rgba(0, 217, 255, 0.1);
  border: 1px solid var(--border-glow);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--accent-primary);
  font-weight: 500;
}

/* ===== FOOTER ===== */
.footer {
  padding: 60px 0 30px;
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-logo-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--bg-primary);
}

.footer-text {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-socials {
  display: flex;
  gap: 12px;
}

.social-link {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition-fast);
}

.social-link:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateY(-3px);
}

.social-link svg {
  width: 20px;
  height: 20px;
}

/* ===== 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 float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 20px rgba(0, 217, 255, 0.3); }
  50% { box-shadow: 0 0 40px rgba(0, 217, 255, 0.6); }
}

.animate-fade-in-up {
  animation: fadeInUp 0.8s ease forwards;
}

.animate-fade-in-left {
  animation: fadeInLeft 0.8s ease forwards;
}

.animate-fade-in-right {
  animation: fadeInRight 0.8s ease forwards;
}

.animate-float {
  animation: float 4s ease-in-out infinite;
}

.animate-glow {
  animation: glow 3s ease-in-out infinite;
}

/* Animation Delays */
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .container {
    padding: 0 30px;
  }
  
  .section {
    padding: 80px 0;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    background: rgba(10, 10, 15, 0.98);
    flex-direction: column;
    padding: 30px;
    gap: 10px;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-medium);
    border-bottom: 1px solid var(--border-color);
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .nav-cta {
    display: none;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
  }
  
  .stat-item {
    padding: 20px;
  }
  
  .stat-number {
    font-size: 2rem;
  }
  
  .container {
    padding: 0 20px;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .section-header {
    margin-bottom: 50px;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .tech-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }
  
  .tech-item {
    padding: 16px 12px;
  }
  
  .tech-item img,
  .tech-item i {
    width: 36px;
    height: 36px;
  }
  
  .btn {
    padding: 14px 24px;
    font-size: 0.9rem;
  }
}