/* 
 * Navaneeth Krishna - Professional Portfolio Stylesheet
 * AI Engineer + DevOps + Software Developer
 */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

/* --- DESIGN SYSTEM & THEME TOKENS --- */
:root {
  --heading-font: 'Outfit', sans-serif;
  --body-font: 'Plus Jakarta Sans', sans-serif;
  
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  --border-radius-sm: 8px;
  --border-radius-md: 16px;
  --border-radius-lg: 24px;
}

[data-bs-theme="light"] {
  --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  --bg-solid: #f8fafc;
  --card-bg: rgba(255, 255, 255, 0.85);
  --card-border: rgba(226, 232, 240, 0.8);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --primary-color: #4f46e5;
  --primary-rgb: 79, 70, 229;
  --secondary-color: #0d9488;
  --secondary-rgb: 13, 148, 136;
  --accent-color: #8b5cf6;
  --accent-rgb: 139, 92, 246;
  --navbar-bg: rgba(248, 250, 252, 0.8);
  --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.05);
  --card-shadow-hover: 0 20px 40px -15px rgba(79, 70, 229, 0.15);
  --glow-color: rgba(79, 70, 229, 0.15);
  --pill-bg: #f1f5f9;
  --timeline-line: #cbd5e1;
}

[data-bs-theme="dark"] {
  --bg-gradient: linear-gradient(135deg, #090d16 0%, #030712 100%);
  --bg-solid: #090d16;
  --card-bg: rgba(17, 24, 39, 0.7);
  --card-border: rgba(255, 255, 255, 0.05);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --primary-color: #6366f1;
  --primary-rgb: 99, 102, 241;
  --secondary-color: #14b8a6;
  --secondary-rgb: 20, 184, 166;
  --accent-color: #a78bfa;
  --accent-rgb: 167, 139, 250;
  --navbar-bg: rgba(9, 13, 22, 0.8);
  --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.4);
  --card-shadow-hover: 0 20px 40px -15px rgba(99, 102, 241, 0.35);
  --glow-color: rgba(99, 102, 241, 0.25);
  --pill-bg: #1f2937;
  --timeline-line: #374151;
}

/* --- BASE STYLES --- */
body {
  font-family: var(--body-font);
  color: var(--text-secondary);
  background: var(--bg-solid);
  background-image: var(--bg-gradient);
  background-attachment: fixed;
  overflow-x: hidden;
  line-height: 1.6;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

h1, h2, h3, h4, h5, h6, .display-font {
  font-family: var(--heading-font);
  color: var(--text-primary);
  font-weight: 700;
}

/* --- SCROLLBAR --- */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-solid);
}
::-webkit-scrollbar-thumb {
  background: var(--pill-bg);
  border-radius: 5px;
  border: 2px solid var(--bg-solid);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--primary-color);
}

/* --- GLOW EFFECTS --- */
.gradient-text {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--accent-color) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
}

.gradient-text-alt {
  background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

/* --- NAVBAR --- */
.navbar {
  background: var(--navbar-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--card-border);
  transition: all var(--transition-smooth);
  padding: 15px 0;
}

.navbar.scrolled {
  padding: 10px 0;
  box-shadow: var(--card-shadow);
}

.navbar-brand {
  font-family: var(--heading-font);
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: -0.5px;
}

.nav-link {
  font-weight: 500;
  color: var(--text-secondary) !important;
  margin: 0 5px;
  padding: 8px 16px !important;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  font-size: 0.95rem;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary-color) !important;
  background: rgba(var(--primary-rgb), 0.08);
}

/* --- HERO SECTION --- */
.hero-section {
  padding: 160px 0 100px 0;
  position: relative;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -10%;
  right: -5%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--glow-color) 0%, rgba(0,0,0,0) 70%);
  z-index: -1;
  filter: blur(40px);
  pointer-events: none;
}

.hero-subtitle {
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--secondary-color);
  font-size: 0.85rem;
  display: inline-block;
  margin-bottom: 12px;
}

.hero-title {
  font-size: 4rem;
  line-height: 1.1;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
}

@media (max-width: 991px) {
  .hero-title {
    font-size: 3rem;
  }
  .hero-section {
    padding: 120px 0 60px 0;
  }
}

.profile-img-container {
  position: relative;
  width: 300px;
  height: 300px;
  margin: 0 auto;
}

.profile-img-wrapper {
  position: relative;
  z-index: 2;
  border-radius: 50%;
  overflow: hidden;
  width: 100%;
  height: 100%;
  border: 4px solid var(--card-bg);
  box-shadow: var(--card-shadow);
  transition: transform var(--transition-smooth);
}

.profile-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-smooth);
}

.profile-img-container:hover .profile-img-wrapper img {
  transform: scale(1.05);
}

.profile-glow-ring {
  position: absolute;
  top: -8px;
  left: -8px;
  right: -8px;
  bottom: -8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color), var(--accent-color));
  z-index: 1;
  opacity: 0.8;
  animation: floatRing 6s ease-in-out infinite;
}

@keyframes floatRing {
  0%, 100% {
    transform: translateY(0) scale(1);
    border-radius: 50%;
  }
  50% {
    transform: translateY(-5px) scale(1.02);
    border-radius: 48% 52% 49% 51% / 52% 48% 52% 48%;
  }
}

/* --- BUTTONS --- */
.btn-premium {
  padding: 12px 28px;
  font-weight: 600;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-premium-primary {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
  color: #fff !important;
  border: none;
  box-shadow: 0 4px 15px rgba(var(--primary-rgb), 0.4);
}

.btn-premium-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(var(--primary-rgb), 0.6);
}

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

.btn-premium-secondary:hover {
  background: var(--pill-bg);
  border-color: var(--primary-color);
  transform: translateY(-3px);
}

/* --- SECTION GENERAL --- */
.section-padding {
  padding: 100px 0;
}

.section-title-wrapper {
  margin-bottom: 60px;
}

.section-pretitle {
  color: var(--primary-color);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 1.5px;
  font-size: 0.85rem;
  display: block;
  margin-bottom: 8px;
}

.section-title {
  font-size: 2.5rem;
  letter-spacing: -0.5px;
  position: relative;
  display: inline-block;
}

/* --- CARDS & BLOCKS --- */
.portfolio-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-md);
  padding: 30px;
  box-shadow: var(--card-shadow);
  transition: all var(--transition-smooth);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  height: 100%;
}

.portfolio-card:hover {
  transform: translateY(-8px);
  border-color: rgba(var(--primary-rgb), 0.2);
  box-shadow: var(--card-shadow-hover);
}

/* --- STATS CARD --- */
.stat-item {
  text-align: center;
  padding: 15px;
  background: rgba(var(--primary-rgb), 0.04);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
}

.stat-item:hover {
  background: rgba(var(--primary-rgb), 0.08);
}

.stat-num {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary-color);
}

/* --- SKILLS SECTION --- */
.skills-category-card {
  height: 100%;
}

.skill-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--pill-bg);
  color: var(--text-primary);
  border-radius: var(--border-radius-sm);
  margin: 5px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  border: 1px solid var(--card-border);
}

.skill-pill:hover {
  background: var(--primary-color);
  color: #fff !important;
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(var(--primary-rgb), 0.25);
  border-color: var(--primary-color);
}

.skill-pill i {
  color: var(--primary-color);
  transition: color var(--transition-fast);
}

.skill-pill:hover i {
  color: #fff;
}

/* --- TIMELINE (INTERNSHIP & EDUCATION) --- */
.timeline {
  position: relative;
  padding-left: 30px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--timeline-line);
}

.timeline-item {
  position: relative;
  margin-bottom: 40px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -30px;
  top: 5px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--primary-color);
  border: 4px solid var(--bg-solid);
  z-index: 2;
  transition: all var(--transition-fast);
}

.timeline-item:hover .timeline-marker {
  transform: scale(1.3);
  background: var(--secondary-color);
}

.timeline-content {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--border-radius-md);
  padding: 24px;
  box-shadow: var(--card-shadow);
  transition: all var(--transition-smooth);
}

.timeline-item:hover .timeline-content {
  border-color: rgba(var(--primary-rgb), 0.2);
  box-shadow: var(--card-shadow-hover);
  transform: translateX(4px);
}

.timeline-date {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--secondary-color);
  margin-bottom: 5px;
  display: block;
}

/* --- PROJECTS --- */
.project-card {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-icon {
  width: 50px;
  height: 50px;
  background: rgba(var(--primary-rgb), 0.1);
  color: var(--primary-color);
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  transition: all var(--transition-fast);
}

.project-card:hover .project-icon {
  background: var(--primary-color);
  color: #fff;
  transform: rotate(10deg);
}

.project-tech-tags {
  margin-top: auto;
  padding-top: 20px;
}

.tech-tag {
  display: inline-block;
  font-size: 0.75rem;
  padding: 3px 10px;
  background: rgba(var(--primary-rgb), 0.08);
  color: var(--primary-color);
  border-radius: 4px;
  margin-right: 5px;
  margin-bottom: 5px;
  font-weight: 600;
}

/* --- CERTIFICATIONS --- */
.cert-card {
  display: flex;
  align-items: flex-start;
  gap: 15px;
  padding: 20px;
}

.cert-icon {
  font-size: 2rem;
  color: var(--secondary-color);
}

/* --- CONTACT --- */
.contact-info-wrapper {
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 25px;
}

.contact-icon {
  width: 48px;
  height: 48px;
  background: rgba(var(--primary-rgb), 0.08);
  color: var(--primary-color);
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.form-control {
  background: rgba(var(--primary-rgb), 0.02);
  border: 1px solid var(--border-color);
  padding: 12px 18px;
  border-radius: var(--border-radius-sm);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.form-control:focus {
  background: var(--card-bg);
  border-color: var(--primary-color);
  box-shadow: 0 0 0 4px var(--glow-color);
  color: var(--text-primary);
}

/* --- FOOTER --- */
.footer {
  background: var(--navbar-bg);
  border-top: 1px solid var(--card-border);
  padding: 40px 0;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.social-links {
  display: flex;
  gap: 10px;
}

.social-icon {
  width: 40px;
  height: 40px;
  background: var(--pill-bg);
  color: var(--text-primary);
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  border: 1px solid var(--card-border);
  text-decoration: none;
}

.social-icon:hover {
  background: var(--primary-color);
  color: #fff;
  transform: translateY(-3px);
  border-color: var(--primary-color);
}

/* --- THEME TOGGLE SWITCH --- */
.theme-switch-wrapper {
  display: flex;
  align-items: center;
}

.theme-toggle-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  font-size: 1.2rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  width: 40px;
  height: 40px;
}

.theme-toggle-btn:hover {
  background: rgba(var(--primary-rgb), 0.08);
}

/* --- ANIMATION & TRANSACTION UTILITIES --- */

/* Click Ripple Container */
.ripple-container {
  position: relative;
  overflow: hidden;
}

/* Click Ripple Element */
.click-ripple {
  position: absolute;
  border-radius: 50%;
  transform: scale(0);
  background-color: rgba(var(--primary-rgb), 0.25);
  pointer-events: none;
  animation: rippleAnimation 0.6s ease-out;
}

@keyframes rippleAnimation {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* Tactile Active States */
.btn-premium:active, 
.social-icon:active, 
.nav-link:active,
.portfolio-card:active {
  transform: scale(0.97);
  transition: transform var(--transition-fast);
}

/* Scroll Progress Indicator */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--accent-color) 100%);
  z-index: 9999;
  transition: width 0.1s ease;
}

/* Entrance Animations */
.fade-in-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.fade-in-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-in-left.active {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-in-right.active {
  opacity: 1;
  transform: translateX(0);
}

.zoom-in {
  opacity: 0;
  transform: scale(0.92);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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