/* ====================================================
   AKHIL AKASH BINDLA PORTFOLIO - style.css
   Final Updated Version - January 2025 (with all intro/firewall/matrix styles restored & optimized)
   ==================================================== */

/* 1. RESET & BASE */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

/* CSS Variables for Light/Dark mode */
:root {
  --bg-color: #0a0a0a;
  --text-color: #ffffff;
  --card-bg: rgba(255, 255, 255, 0.06);
  --card-border: rgba(255, 255, 255, 0.12);
  --accent: #00d4ff;
  --accent-gradient: linear-gradient(135deg, #00d4ff, #a777e5);
}

body.light-mode {
  --bg-color: #f4f7fa;
  --text-color: #0a0a0a;
  --card-bg: rgba(255, 255, 255, 0.82);
  --card-border: rgba(0, 0, 0, 0.09);
  --accent: #0066cc;
}

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background 0.5s ease, color 0.5s ease;
}

/* 2. 3D BACKGROUND */
#bg-3d {
  position: fixed;
  inset: 0;
  z-index: -1;
  opacity: 0.32;
  pointer-events: none;
}

/* 3. THEME TOGGLE */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 25px;
  z-index: 1000;
}

#theme-switch {
  display: none;
}

.toggle-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 88px;
  height: 42px;
  background: #1e1e2e;
  border-radius: 50px;
  position: relative;
  cursor: pointer;
  padding: 0 14px;
  box-shadow: inset 0 2px 10px rgba(0,0,0,0.6);
  transition: background 0.45s ease;
}

.toggle-label::before {
  content: '';
  position: absolute;
  width: 34px;
  height: 34px;
  background: linear-gradient(145deg, #ffffff, #e0e0ff);
  border-radius: 50%;
  top: 4px;
  left: 4px;
  transition: transform 0.45s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  box-shadow: 0 3px 12px rgba(0,0,0,0.45);
}

#theme-switch:checked + .toggle-label {
  background: var(--accent-gradient);
}

#theme-switch:checked + .toggle-label::before {
  transform: translateX(46px);
  background: linear-gradient(145deg, #fffacd, #ffd700);
}

.sun, .moon {
  font-size: 26px;
  transition: opacity 0.4s ease, transform 0.4s ease;
  z-index: 2;
}

.sun { color: #ffeb3b; }
.moon { color: #e0e7ff; }

#theme-switch:checked + .toggle-label .sun { opacity: 1; transform: scale(1.1); }
#theme-switch:checked + .toggle-label .moon { opacity: 0.35; transform: scale(0.9); }

.toggle-label .sun { opacity: 0.4; }
.toggle-label .moon { opacity: 1; }

/* 4. HERO SECTION */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  position: relative;
  background: radial-gradient(ellipse at center, rgba(0, 212, 255, 0.1) 0%, transparent 70%);
}

.hero-content {
  text-align: center;
  max-width: 800px;
  z-index: 2;
}

.avatar-img {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 2rem;
  border: 3px solid rgba(0, 212, 255, 0.4);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.3);
  transition: transform 0.3s ease;
}

.avatar-img:hover {
  transform: scale(1.05);
}

h1 {
  font-family: 'Orbitron', monospace;
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  background: linear-gradient(135deg, #00D4FF, #A777E5);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.tagline {
  font-size: 1.2rem;
  color: #b0b0b0;
  margin-bottom: 2.5rem;
  font-weight: 400;
}

/* 5. BUTTONS */
.cta, .cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn, .btn-primary, .btn-secondary {
  padding: 0.75rem 2rem;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s ease;
  display: inline-block;
}

.btn-primary {
  background: linear-gradient(135deg, #00D4FF, #A777E5);
  color: #fff;
  box-shadow: 0 10px 30px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 40px rgba(0, 212, 255, 0.4);
}

.btn-secondary {
  background: transparent;
  color: #00D4FF;
  border: 2px solid #00D4FF;
}

.btn-secondary:hover {
  background: #00D4FF;
  color: #0a0a0a;
  transform: translateY(-2px);
}

/* 6. GLASS CARDS */
.glass-card {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 2.5rem;
  margin: 3rem auto;
  max-width: 900px;
  position: relative;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
  transition: transform 0.4s ease;
}

body.light-mode .glass-card {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(15px);
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(167, 119, 229, 0.1));
  border-radius: 20px;
  z-index: -1;
}

[data-tilt] {
  transform-style: preserve-3d;
  perspective: 1000px;
}

[data-tilt]:hover {
  transform: translateY(-10px);
}

/* 7. SECTION HEADINGS */
h2 {
  font-family: 'Orbitron', monospace;
  font-size: 2rem;
  font-weight: 700;
  color: #00D4FF;
  margin-bottom: 1.5rem;
  text-align: center;
  letter-spacing: 0.05em;
}

/* 8. SKILLS */
.skill-badges {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.skill-badges span {
  background: rgba(0, 212, 255, 0.2);
  color: #00D4FF;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 600;
  border: 1px solid rgba(0, 212, 255, 0.3);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.skill-item {
  text-align: center;
  padding: 1.5rem;
  background: rgba(255,255,255,0.05);
  border-radius: 15px;
  border: 1px solid rgba(0,212,255,0.2);
  transition: transform 0.3s ease;
}

body.light-mode .skill-item {
  background: rgba(10,10,10,0.08);
}

.skill-item:hover {
  transform: translateY(-5px);
}

.skill-icon {
  width: 60px; height: 60px;
  background: linear-gradient(135deg, #00D4FF, #A777E5);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: bold;
  color: #fff;
  margin-bottom: 1rem;
}

/* 9. PROJECTS */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.project-item {
  text-align: center;
  padding: 1.5rem;
  background: rgba(255,255,255,0.05);
  border-radius: 15px;
  border: 1px solid rgba(0,212,255,0.2);
  transition: transform 0.3s ease;
  text-decoration: none;
  color: inherit;
}

body.light-mode .project-item {
  background: rgba(10,10,10,0.08);
}

.project-item:hover {
  transform: translateY(-5px);
}

.icon {
  width: 60px; height: 60px;
  background: linear-gradient(135deg, #00D4FF, #A777E5);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: bold;
  color: #fff;
  margin-bottom: 1rem;
}

.project-item h3 {
  font-family: 'Orbitron', monospace;
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
}

.project-item p {
  color: #b0b0b0;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.view-more {
  color: #00D4FF;
  font-weight: 600;
  font-size: 0.9rem;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.project-item:hover .view-more {
  opacity: 1;
}

/* 10. ACHIEVEMENTS */
.achieve-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 1.5rem;
}

.achieve-item {
  text-align: center;
  padding: 1.5rem;
  background: rgba(255,255,255,0.05);
  border-radius: 15px;
  border: 1px solid rgba(0,212,255,0.2);
  transition: transform 0.3s ease;
}

body.light-mode .achieve-item {
  background: rgba(10,10,10,0.08);
}

.achieve-item:hover {
  transform: translateY(-8px);
}

.achieve-item img {
  width: 80px; height: 80px;
  object-fit: contain;
  margin-bottom: 1rem;
  border-radius: 12px;
  background: #fff;
  padding: 8px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.achieve-item h3 {
  font-family: 'Orbitron', monospace;
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

/* 11. CONTACT */
.social {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.social a {
  color: #00D4FF;
  text-decoration: none;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: 25px;
  transition: all 0.3s ease;
  border: 1px solid rgba(0, 212, 255, 0.3);
}

.social a:hover {
  background: rgba(0, 212, 255, 0.1);
  transform: translateY(-2px);
}

/* 12. ORIGINAL NAV (adapted) */
nav {
  background: linear-gradient(90deg, #00f7ff, #ff00ff);
  padding: 1rem;
  text-align: center;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 0 15px rgba(0, 247, 255, 0.5);
}

nav a {
  color: #ffffff;
  margin: 0 0.5rem;
  text-decoration: none;
  font-family: 'Orbitron', sans-serif;
  font-weight: 700;
  text-transform: uppercase;
}

nav a:hover {
  text-shadow: 0 0 15px #00f7ff, 0 0 30px #ff00ff;
}

/* 13. TIMELINE (from original, adapted) */
.timeline {
  position: relative;
  padding: 1rem 0;
}

.timeline-item {
  margin: 2rem 0;
  padding-left: 2rem;
  border-left: 2px solid #00f7ff;
  position: relative;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 0;
  width: 12px;
  height: 12px;
  background: #ff00ff;
  border-radius: 50%;
}

.timeline-logo {
  height: 50px;
  margin-bottom: 0.5rem;
}

/* 14. BADGE (from original) */
.badge {
  background: linear-gradient(90deg, #00f7ff, #ff00ff);
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  font-size: 0.8rem;
  margin-left: 0.5rem;
}

/* 15. ADDITIONAL ORIGINAL ELEMENTS (education-card, talk-card, blog-post, testimonial) */
.education-card, .talk-card, .blog-post, .testimonial {
  background-color: rgba(42, 42, 42, 0.9);
  padding: 1rem;
  margin: 1rem 0;
  border-radius: 5px;
  box-shadow: 0 0 10px rgba(0, 247, 255, 0.4);
}

/* 16. INTRO STYLES (FULL - for index.html splash screen) */
#intro-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #1a1a1a;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.stage {
  width: 100%;
  max-width: 800px;
  text-align: left;
  color: #ffffff;
  font-family: 'Roboto', sans-serif;
}

.terminal {
  background: #2a2a2a;
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 0 20px rgba(0, 247, 255, 0.4);
  max-height: 80vh;
  overflow-y: auto;
  transition: opacity 1s ease-out, transform 1s ease-out;
}

.terminal.scroll-out {
  opacity: 0;
  transform: translateY(-20px);
}

.terminal p {
  margin: 0.5rem 0;
  font-size: 1.2rem;
}

.input-line {
  display: flex;
  align-items: center;
}

.input-line span {
  font-size: 1.2rem;
}

.cursor {
  display: inline-block;
  width: 10px;
  height: 20px;
  background: #00f7ff;
  animation: blink 1s step-end infinite;
}

.firewall {
  background: #2a2a2a;
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 0 20px rgba(0, 247, 255, 0.4);
  text-align: center;
}

.firewall h2 {
  font-family: 'Orbitron', sans-serif;
  color: #ff00ff;
}

.firewall-options {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 1rem 0;
}

.firewall-btn {
  background: #333;
  padding: 0.5rem;
  border: none;
  color: #fff;
  border-radius: 5px;
  cursor: pointer;
  font-family: 'Roboto', sans-serif;
  transition: background 0.3s;
  position: relative;
}

.firewall-btn:hover {
  background: linear-gradient(90deg, #00f7ff, #ff00ff);
}

.firewall-btn:hover::after {
  content: attr(title);
  position: absolute;
  top: -30px;
  left: 50%;
  transform: translateX(-50%);
  background: #333;
  padding: 0.5rem;
  border-radius: 5px;
  font-size: 0.8rem;
  white-space: nowrap;
  z-index: 10;
}

#firewall-logs p {
  margin: 0.5rem 0;
  font-size: 1rem;
  text-align: left;
}

#firewall-status {
  margin-top: 1rem;
  font-size: 1.2rem;
}

.decryption {
  background: #2a2a2a;
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 0 20px rgba(0, 247, 255, 0.4);
  text-align: center;
  position: relative;
  z-index: 2;
}

.decryption h2 {
  font-family: 'Orbitron', sans-serif;
  color: #ff00ff;
}

#decryption-logs p {
  margin: 0.5rem 0;
  font-size: 1.2rem;
}

#decryption-complete {
  display: none;
  font-size: 1.5rem;
  font-family: 'Orbitron', sans-serif;
}

.glitch {
  color: #00f7ff;
  position: relative;
  animation: glitch 0.5s linear infinite;
}

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

.glitch::before {
  color: #ff00ff;
  left: 2px;
  animation: glitch-left 0.5s linear infinite reverse;
}

.glitch::after {
  color: #ffffff;
  left: -2px;
  animation: glitch-right 0.5s linear infinite reverse;
}

#matrix-rain {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

/* 17. RESPONSIVE */
@media (max-width: 768px) {
  #hero { padding: 1rem; }
  .avatar-img { width: 180px; height: 180px; }
  .cta { flex-direction: column; align-items: center; }
  .glass-card { margin: 1.5rem; padding: 1.5rem; }
  .project-grid, .skills-grid, .achieve-grid { grid-template-columns: 1fr; }
  .social { flex-direction: column; align-items: center; }
  #intro-container, .stage { max-width: 100%; padding: 1rem; }
  .terminal, .firewall, .decryption { padding: 1.5rem; font-size: 1rem; }
  .firewall-options { gap: 0.8rem; }
  .firewall-btn { font-size: 0.9rem; }
}

@media (max-width: 480px) {
  h1 { font-size: 2rem; }
  .tagline { font-size: 1rem; }
  .glass-card { margin: 1rem; padding: 1rem; }
  .terminal p, #firewall-logs p, #decryption-logs p { font-size: 1rem; }
  #decryption-complete { font-size: 1.3rem; }
  .cursor { height: 18px; }
}

/* 18. ANIMATIONS & SCROLLBAR */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.glass-card { animation: fadeInUp 0.8s ease forwards; }

@keyframes blink {
  50% { opacity: 0; }
}

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

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

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

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #0a0a0a; }
::-webkit-scrollbar-thumb { background: linear-gradient(135deg, #00D4FF, #A777E5); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: linear-gradient(135deg, #A777E5, #00D4FF); }

/* Performance */
.glass-card, .project-item, .btn, .skill-item, .achieve-item {
  will-change: transform;
}