/* ============================================
   G'anisher Raximov — Portfolio & Academic Hub
   Design System & Styles
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;700&display=swap');

/* ── CSS Custom Properties ── */
:root {
  /* Dark Mode (Default) */
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.7);
  --bg-glass: rgba(255, 255, 255, 0.04);
  --bg-glass-hover: rgba(255, 255, 255, 0.08);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glass-hover: rgba(255, 255, 255, 0.15);

  --text-primary: #f0f4f8;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-purple: #a855f7;
  --accent-purple-glow: rgba(168, 85, 247, 0.3);
  --accent-teal: #14b8a6;
  --accent-teal-glow: rgba(20, 184, 166, 0.3);
  --accent-blue: #3b82f6;
  --accent-blue-glow: rgba(59, 130, 246, 0.3);
  --accent-pink: #ec4899;
  --accent-gradient: linear-gradient(135deg, #a855f7, #3b82f6, #14b8a6);
  --accent-gradient-hover: linear-gradient(135deg, #c084fc, #60a5fa, #2dd4bf);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow-purple: 0 0 30px rgba(168, 85, 247, 0.2);
  --shadow-glow-teal: 0 0 30px rgba(20, 184, 166, 0.2);
  --shadow-glow-blue: 0 0 30px rgba(59, 130, 246, 0.2);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  --navbar-height: 72px;
  --container-max: 1200px;
  --container-padding: 24px;
}

/* Light Mode Variables */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.8);
  --bg-glass: rgba(255, 255, 255, 0.6);
  --bg-glass-hover: rgba(255, 255, 255, 0.85);
  --border-glass: rgba(0, 0, 0, 0.06);
  --border-glass-hover: rgba(0, 0, 0, 0.12);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  --accent-purple: #7c3aed;
  --accent-purple-glow: rgba(124, 58, 237, 0.15);
  --accent-teal: #0d9488;
  --accent-teal-glow: rgba(13, 148, 136, 0.15);
  --accent-blue: #2563eb;
  --accent-blue-glow: rgba(37, 99, 235, 0.15);
  --accent-gradient: linear-gradient(135deg, #7c3aed, #2563eb, #0d9488);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.1);
  --shadow-glow-purple: 0 0 30px rgba(124, 58, 237, 0.1);
  --shadow-glow-teal: 0 0 30px rgba(13, 148, 136, 0.1);
  --shadow-glow-blue: 0 0 30px rgba(37, 99, 235, 0.1);
}

/* ── Reset & Base ── */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--navbar-height);
}

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

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

ul {
  list-style: none;
}

/* ── Loader ── */
#gloader {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 24px;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

#gloader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-initials {
  font-size: 64px;
  font-weight: 900;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: loaderPulse 1.5s ease-in-out infinite;
  letter-spacing: 4px;
}

.loader-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border-glass);
  border-top-color: var(--accent-purple);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes loaderPulse {
  0%, 100% { opacity: 0.5; transform: scale(0.95); }
  50% { opacity: 1; transform: scale(1.05); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── Animated Background Particles ── */
#particles-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.particle {
  position: absolute;
  width: 3px;
  height: 3px;
  background: var(--accent-purple);
  border-radius: 50%;
  opacity: 0;
  animation: particleFloat linear infinite;
}

@keyframes particleFloat {
  0% {
    opacity: 0;
    transform: translateY(100vh) scale(0);
  }
  10% {
    opacity: 0.6;
  }
  90% {
    opacity: 0.6;
  }
  100% {
    opacity: 0;
    transform: translateY(-10vh) scale(1);
  }
}

/* ── Container ── */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* ── Section ── */
.section {
  padding: 100px 0;
  position: relative;
  z-index: 1;
}

.section-title {
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 800;
  margin-bottom: 16px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  margin-bottom: 56px;
}

/* ── Navbar ── */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--navbar-height);
  z-index: 1000;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(10, 14, 26, 0.8);
  border-bottom: 1px solid var(--border-glass);
  transition: all var(--transition-base);
}

[data-theme="light"] #navbar {
  background: rgba(248, 250, 252, 0.85);
}

#navbar.scrolled {
  box-shadow: var(--shadow-md);
}

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

.nav-logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: var(--bg-glass-hover);
}

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

/* Theme Toggle */
.theme-toggle {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-glass);
  background: var(--bg-glass);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all var(--transition-fast);
  margin-left: 8px;
}

.theme-toggle:hover {
  background: var(--bg-glass-hover);
  color: var(--accent-purple);
  border-color: var(--accent-purple);
  transform: rotate(15deg);
}

/* Nav Profile Button */
.btn-nav-profile {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--accent-gradient);
  color: #fff;
  text-decoration: none;
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 12px var(--accent-purple-glow);
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn-nav-profile:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 6px 24px var(--accent-purple-glow);
}

.btn-nav-profile .btn-icon {
  font-size: 1rem;
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
  background: var(--bg-glass);
  color: var(--text-primary);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.mobile-menu-btn.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.mobile-menu-btn.open span:nth-child(2) {
  opacity: 0;
}
.mobile-menu-btn.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ── Hero Section ── */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--navbar-height);
}

.hero-bg-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 40%, rgba(168, 85, 247, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 60%, rgba(20, 184, 166, 0.1) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 50% 20%, rgba(59, 130, 246, 0.08) 0%, transparent 60%);
  z-index: 0;
}

[data-theme="light"] .hero-bg-gradient {
  background:
    radial-gradient(ellipse 80% 60% at 20% 40%, rgba(124, 58, 237, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 60%, rgba(13, 148, 136, 0.06) 0%, transparent 60%);
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 80px;
  width: 100%;
}

.hero-text {
  flex: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border-radius: var(--radius-full);
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent-teal);
  margin-bottom: 28px;
  backdrop-filter: blur(10px);
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-teal);
  animation: dotPulse 2s ease-in-out infinite;
}

@keyframes dotPulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(20, 184, 166, 0.5); }
  50% { opacity: 0.7; box-shadow: 0 0 0 6px rgba(20, 184, 166, 0); }
}

.hero-greeting {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  font-weight: 400;
  margin-bottom: 8px;
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero-name .highlight {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-tagline {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 500px;
  line-height: 1.8;
}

.hero-tagline .tag {
  display: inline-block;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-glass);
  background: var(--bg-glass);
  font-size: 0.85rem;
  margin: 4px 4px 4px 0;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.hero-tagline .tag:hover {
  border-color: var(--accent-purple);
  background: var(--accent-purple-glow);
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-image-wrapper {
  flex-shrink: 0;
  position: relative;
  padding: 6px;
  border-radius: 50%;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-image-wrapper::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(from 0deg, transparent 0%, transparent 40%, var(--accent-purple) 80%, var(--accent-teal) 100%);
  animation: neonSpin 3s linear infinite;
  z-index: 0;
}

.hero-image-wrapper::after {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  background: conic-gradient(from 0deg, transparent 0%, transparent 50%, rgba(168, 85, 247, 0.5) 80%, rgba(20, 184, 166, 0.8) 100%);
  animation: neonSpin 3s linear infinite;
  filter: blur(15px);
  z-index: -1;
}

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

.hero-image {
  width: 310px;
  height: 310px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--bg-primary);
  background: var(--bg-primary);
  position: relative;
  z-index: 1;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: var(--radius-full);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn:hover::before {
  opacity: 1;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-purple-glow);
}

.btn-primary:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 8px 30px var(--accent-purple-glow);
}

.btn-primary:active {
  transform: translateY(0) scale(0.98);
}

.btn-secondary {
  background: var(--bg-glass);
  color: var(--text-primary);
  border: 1px solid var(--border-glass);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  transform: translateY(-2px) scale(1.03);
  border-color: var(--accent-teal);
  box-shadow: 0 8px 30px var(--accent-teal-glow);
  background: var(--bg-glass-hover);
}

.btn-canva {
  background: linear-gradient(135deg, #7B2FF7, #00C4CC);
  color: #fff;
  font-weight: 700;
  box-shadow: 0 4px 20px rgba(123, 47, 247, 0.3);
}

.btn-canva:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 8px 30px rgba(123, 47, 247, 0.5);
}

.btn-icon {
  font-size: 1.1rem;
}

/* ── Glass Card ── */
.glass-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 32px;
  transition: all var(--transition-base);
}

.glass-card:hover {
  border-color: var(--border-glass-hover);
  background: var(--bg-glass-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

/* ── About Section ── */
#about .about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 16px;
  line-height: 1.8;
}

.skills-grid {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.skill-item {
  position: relative;
}

.skill-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
}

.skill-name {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.skill-percent {
  font-weight: 700;
  font-size: 0.9rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent-purple);
}

.skill-bar {
  height: 10px;
  border-radius: var(--radius-full);
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  overflow: hidden;
}

.skill-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--accent-gradient);
  width: 0%;
  transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.skill-fill::after {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 30px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3));
  border-radius: var(--radius-full);
}

/* Skill Tags */
.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.skill-tag {
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  color: var(--text-primary);
  transition: all var(--transition-fast);
  cursor: default;
}

.skill-tag:hover {
  border-color: var(--accent-purple);
  background: var(--accent-purple-glow);
  transform: translateY(-2px);
}
.skill-tag i {
  font-size: 1rem;
  vertical-align: -1px;
  margin-right: 2px;
  color: var(--accent-purple);
}

/* Remix Icon base styling */
.hero-tagline .tag i {
  font-size: 1rem;
  color: var(--accent-teal);
  margin-right: 2px;
}

.btn-icon i {
  font-size: 1.1rem;
}

.presentation-badge i {
  font-size: 0.85rem;
  vertical-align: -1px;
  margin-right: 2px;
}

.partnership-intro h3 i {
  color: var(--accent-purple);
  margin-right: 4px;
}
/* ── Stats Section ── */
.stats-section {
  padding: 60px 0;
  position: relative;
  z-index: 1;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-card {
  text-align: center;
  padding: 40px 24px;
}

.stat-icon {
  font-size: 2.4rem;
  margin-bottom: 16px;
  display: block;
}

.stat-icon i {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 8px var(--accent-purple-glow));
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 900;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-family: 'JetBrains Mono', monospace;
  margin-bottom: 8px;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

/* ── Tech Stack Section ── */
.techstack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 28px;
}

.techstack-card {
  position: relative;
  overflow: hidden;
}

.techstack-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.techstack-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.techstack-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--card-accent) 15%, transparent), color-mix(in srgb, var(--card-accent) 5%, transparent));
  border: 1px solid color-mix(in srgb, var(--card-accent) 25%, transparent);
  box-shadow: 0 0 20px color-mix(in srgb, var(--card-accent) 15%, transparent);
  transition: all var(--transition-base);
}

.techstack-card:hover .techstack-icon-wrapper {
  transform: scale(1.1) rotate(-5deg);
  box-shadow: 0 0 30px color-mix(in srgb, var(--card-accent) 30%, transparent);
}

.techstack-icon {
  font-size: 1.6rem;
}

.techstack-icon i {
  color: var(--card-accent);
  filter: drop-shadow(0 0 6px var(--card-accent));
}

/* ── Portfolio Section ── */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 28px;
}

.portfolio-card {
  position: relative;
  overflow: hidden;
}

.portfolio-card-icon {
  font-size: 2.8rem;
  margin-bottom: 20px;
  display: block;
}

.portfolio-card-icon i {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 10px var(--accent-purple-glow));
}

.portfolio-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.portfolio-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.portfolio-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.portfolio-card-tags span {
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--accent-purple-glow);
  color: var(--accent-purple);
  border: 1px solid rgba(168, 85, 247, 0.2);
}

.portfolio-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.portfolio-card:hover::after {
  opacity: 1;
}

/* ── Presentations Section ── */
.presentations-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 28px;
}

.presentation-card {
  padding: 40px;
  position: relative;
  overflow: hidden;
}

.presentation-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.04) 0%, transparent 60%);
  transition: transform var(--transition-slow);
}

.presentation-card:hover::before {
  transform: translate(10%, 10%);
}

.presentation-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.presentation-badge.academic {
  background: var(--accent-blue-glow);
  color: var(--accent-blue);
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.presentation-badge.research {
  background: var(--accent-teal-glow);
  color: var(--accent-teal);
  border: 1px solid rgba(20, 184, 166, 0.2);
}

.presentation-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-primary);
  position: relative;
}

.presentation-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 28px;
  position: relative;
}

.presentation-card .btn-canva {
  position: relative;
}

/* ── Partnership Section ── */
.partnership-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.partnership-intro h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.partnership-intro p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.8;
}

.partnership-list {
  counter-reset: partnership;
}

.partnership-item {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-glass);
  transition: all var(--transition-fast);
}

.partnership-item:hover {
  padding-left: 12px;
  border-color: var(--accent-purple);
}

.partnership-item:last-child {
  border-bottom: none;
}

.partnership-number {
  counter-increment: partnership;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent-purple);
  min-width: 32px;
}

.partnership-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ── Channels Section ── */
.channels-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  max-width: 900px;
  margin: 0 auto;
}

.channel-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 40px 28px 36px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-glass);
  transition: all var(--transition-base);
}

.channel-card:hover {
  border-color: var(--channel-color);
  box-shadow:
    0 0 20px color-mix(in srgb, var(--channel-color) 25%, transparent),
    0 0 60px color-mix(in srgb, var(--channel-color) 10%, transparent),
    inset 0 0 30px color-mix(in srgb, var(--channel-color) 5%, transparent);
  transform: translateY(-6px);
}

.channel-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--channel-color);
  opacity: 0;
  transition: opacity var(--transition-base);
  box-shadow: 0 0 15px var(--channel-color);
}

.channel-card:hover::after {
  opacity: 1;
}

.channel-icon-wrapper {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: 24px;
  background: color-mix(in srgb, var(--channel-color) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--channel-color) 15%, transparent);
  transition: all var(--transition-base);
}

.channel-icon-wrapper i {
  color: var(--channel-color);
  filter: drop-shadow(0 0 8px color-mix(in srgb, var(--channel-color) 50%, transparent));
  transition: all var(--transition-base);
}

.channel-card:hover .channel-icon-wrapper {
  transform: scale(1.15);
  background: color-mix(in srgb, var(--channel-color) 18%, transparent);
  border-color: var(--channel-color);
  box-shadow: 0 0 30px color-mix(in srgb, var(--channel-color) 30%, transparent);
}

.channel-card:hover .channel-icon-wrapper i {
  filter: drop-shadow(0 0 14px var(--channel-color));
  transform: scale(1.1);
}

.channel-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
  transition: color var(--transition-base);
}

.channel-card:hover h3 {
  color: var(--channel-color);
}

.channel-handle {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-family: 'JetBrains Mono', monospace;
  margin-bottom: 14px;
}

.channel-desc {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.6;
  display: block;
}

/* ── Contact Section ── */
#contact {
  padding-bottom: 120px;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: 960px;
  margin: 0 auto;
}

.contact-card {
  text-align: center;
  padding: 40px 24px;
  cursor: pointer;
}

.contact-card:hover {
  border-color: var(--accent-purple);
}

.contact-icon {
  font-size: 2.8rem;
  margin-bottom: 16px;
  display: block;
}

.contact-icon i {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 10px var(--accent-purple-glow));
}

.contact-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.contact-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ── Floating Telegram Button ── */
.floating-telegram {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 999;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2AABEE, #229ED9);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 1.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(42, 171, 238, 0.4);
  transition: all var(--transition-base);
  animation: floatBounce 3s ease-in-out infinite;
}

.floating-telegram:hover {
  transform: scale(1.1) translateY(-4px);
  box-shadow: 0 8px 30px rgba(42, 171, 238, 0.6);
}

.floating-telegram .tooltip {
  position: absolute;
  right: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%);
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 500;
  white-space: nowrap;
  border: 1px solid var(--border-glass);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  pointer-events: none;
}

.floating-telegram:hover .tooltip {
  opacity: 1;
  visibility: visible;
}

@keyframes floatBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ── Footer ── */
.footer {
  position: relative;
  z-index: 1;
  padding: 32px 0;
  border-top: 1px solid var(--border-glass);
  text-align: center;
}

.footer p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer .heart {
  color: var(--accent-pink);
  animation: heartBeat 1.5s ease-in-out infinite;
  display: inline-block;
}

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

/* ── Scroll Reveal Animations ── */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ── Responsive ── */
@media (max-width: 968px) {
  .hero-content {
    flex-direction: column-reverse;
    text-align: center;
    gap: 40px;
  }

  .hero-tagline { margin: 0 auto 40px; }
  .hero-buttons { justify-content: center; }
  .hero-image { width: 240px; height: 240px; }

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

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .presentations-grid {
    grid-template-columns: 1fr;
  }

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

  .contact-grid {
    grid-template-columns: repeat(2, 1fr);
    max-width: 600px;
  }

  .channels-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
  }
}

@media (max-width: 768px) {
  :root {
    --container-padding: 16px;
    --navbar-height: 64px;
  }

  .nav-menu {
    display: none;
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    z-index: 999;
  }

  .nav-menu.open {
    display: flex;
  }

  .nav-link {
    font-size: 1.2rem;
    padding: 12px 24px;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .btn-nav-profile {
    display: none;
  }

  .section {
    padding: 60px 0;
  }

  .portfolio-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .stat-card {
    padding: 24px 16px;
  }

  .stat-number {
    font-size: 2rem;
  }

  .hero-name {
    font-size: 2.2rem;
  }

  .floating-telegram {
    bottom: 20px;
    right: 20px;
    width: 52px;
    height: 52px;
    font-size: 1.4rem;
  }

  .floating-telegram .tooltip {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .hero-image { width: 180px; height: 180px; }
}

/* ── Scroll Reveal Animations ── */
.reveal {
  opacity: 0;
  transform: translateY(40px) scale(0.98);
  transition: opacity 0.8s cubic-bezier(0.5, 0, 0, 1), transform 0.8s cubic-bezier(0.5, 0, 0, 1);
  will-change: opacity, transform;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.reveal-delay-1 { transition-delay: 0.15s; }
.reveal-delay-2 { transition-delay: 0.30s; }
.reveal-delay-3 { transition-delay: 0.45s; }

/* ── Typewriter Effect ── */
.typewriter {
  display: inline-block;
  overflow: hidden;
  white-space: nowrap;
  border-right: 3px solid var(--accent-teal);
  animation: typing 2.5s steps(30, end) forwards, blink-caret 0.8s step-end infinite;
  max-width: 100%;
}

@keyframes typing {
  from { width: 0 }
  to { width: 100% }
}

@keyframes blink-caret {
  from, to { border-color: transparent }
  50% { border-color: var(--accent-teal); }
}

/* ── Smooth scrollbar (Webkit) ── */
::-webkit-scrollbar {
  width: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--accent-purple);
  border-radius: var(--radius-full);
}

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

/* ── Selection ── */
::selection {
  background: var(--accent-purple-glow);
  color: var(--text-primary);
}