/* =========================================
   VARIABLES
   ========================================= */
:root {
  --bg: #0b0b12;
  --bg-2: #111120;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.07);
  --border-hover: rgba(124, 58, 237, 0.5);
  --text: #e2e8f0;
  --text-muted: #64748b;
  --text-subtle: #94a3b8;
  --accent: #7c3aed;
  --accent-2: #3b82f6;
  --accent-glow: rgba(124, 58, 237, 0.25);
  --gradient: linear-gradient(135deg, #7c3aed, #3b82f6);
  --gradient-text: linear-gradient(135deg, #a78bfa, #60a5fa);
  --nav-h: 64px;
  --max-w: 1100px;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg: #f8fafc;
  --bg-2: #f1f5f9;
  --bg-card: rgba(0, 0, 0, 0.03);
  --bg-card-hover: rgba(0, 0, 0, 0.05);
  --border: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(109, 40, 217, 0.4);
  --text: #0f172a;
  --text-muted: #64748b;
  --text-subtle: #475569;
  --accent: #6d28d9;
  --accent-2: #2563eb;
  --accent-glow: rgba(109, 40, 217, 0.15);
  --gradient: linear-gradient(135deg, #6d28d9, #2563eb);
  --gradient-text: linear-gradient(135deg, #7c3aed, #3b82f6);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s, color 0.3s;
  overflow-x: hidden;
}

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

strong {
  font-weight: 600;
  color: var(--text);
}

/* =========================================
   NAVIGATION
   ========================================= */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(11, 11, 18, 0.8);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s, border-color 0.3s;
}

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

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.nav-logo {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  color: var(--text);
  cursor: pointer;
}

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

.nav-links {
  display: flex;
  gap: 2rem;
  font-size: 0.875rem;
  font-weight: 500;
}

.nav-links a {
  color: var(--text-muted);
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--gradient);
  transition: width var(--transition);
}

.nav-links a:hover {
  color: var(--text);
}

.nav-links a:hover::after {
  width: 100%;
}

#theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  transition: all var(--transition);
}

#theme-toggle:hover {
  color: var(--text);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.icon-moon { display: block; }
.icon-sun  { display: none; }

[data-theme="light"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun  { display: block; }

/* =========================================
   HERO
   ========================================= */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: calc(var(--nav-h) + 4rem) 2rem 6rem;
  text-align: center;
  overflow: hidden;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 40%, black 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 40%, black 30%, transparent 100%);
}

.hero-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  animation: blobFloat 10s ease-in-out infinite;
}

.hero-blob-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.18), transparent 70%);
  top: -10%;
  right: -15%;
  animation-delay: 0s;
}

.hero-blob-2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.14), transparent 70%);
  bottom: 5%;
  left: -10%;
  animation-delay: -5s;
}

@keyframes blobFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%       { transform: translate(25px, -25px) scale(1.07); }
  66%       { transform: translate(-15px, 20px) scale(0.94); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-subtle);
  background: var(--bg-card);
  margin-bottom: 2rem;
  backdrop-filter: blur(10px);
}

.badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 6px #22c55e;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.6; transform: scale(0.85); }
}

.hero-name {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.05;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--text-subtle);
  margin-bottom: 1.5rem;
  min-height: 1.8em;
  font-weight: 400;
}

.cursor {
  animation: blink 1s step-end infinite;
  opacity: 1;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 580px;
  margin: 0 auto 2.5rem;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  font-family: inherit;
}

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px var(--accent-glow);
}

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

.btn-ghost:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.hero-scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  z-index: 1;
  animation: fadeInUp 1s ease 1.5s both;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.4; transform: scaleY(1); }
  50%       { opacity: 1;   transform: scaleY(1.1); }
}

/* =========================================
   SECTIONS
   ========================================= */
.section {
  padding: 7rem 2rem;
}

.section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 3rem;
  line-height: 1.2;
}

/* Fade-in animation */
.fade-in {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* =========================================
   ABOUT
   ========================================= */
.about-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4rem;
  align-items: start;
}

.about-text p {
  color: var(--text-subtle);
  font-size: 1.05rem;
  line-height: 1.85;
  max-width: 580px;
}

.about-text p + p {
  margin-top: 1.2rem;
}

.about-stats {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 140px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: border-color var(--transition), transform var(--transition);
}

.stat-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-top: 0.3rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* =========================================
   PROJECTS
   ========================================= */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  transition: border-color var(--transition), transform var(--transition), background var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--gradient);
  opacity: 0;
  transition: opacity var(--transition);
}

.project-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.project-card:hover::before {
  opacity: 1;
}

.project-featured {
  grid-column: span 2;
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.06), rgba(59, 130, 246, 0.04));
  border-color: rgba(124, 58, 237, 0.2);
}

.project-featured:hover {
  border-color: rgba(124, 58, 237, 0.5);
  box-shadow: 0 20px 60px rgba(124, 58, 237, 0.15);
}

.project-card-top {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.project-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  flex-shrink: 0;
}

.project-featured .project-icon {
  width: 46px;
  height: 46px;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.project-badges {
  display: flex;
  gap: 0.4rem;
  flex: 1;
}

.featured-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: rgba(124, 58, 237, 0.15);
  color: #a78bfa;
  border: 1px solid rgba(124, 58, 237, 0.25);
}

.hardware-badge {
  background: rgba(20, 184, 166, 0.12);
  color: #2dd4bf;
  border-color: rgba(20, 184, 166, 0.25);
}

.internship-badge {
  background: rgba(245, 158, 11, 0.12);
  color: #fbbf24;
  border-color: rgba(245, 158, 11, 0.25);
}

.project-gh-link {
  margin-left: auto;
  color: var(--text-muted);
  transition: color var(--transition), transform var(--transition);
  flex-shrink: 0;
}

.project-gh-link:hover {
  color: var(--text);
  transform: translateY(-1px);
}

.project-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1.3;
}

.project-featured h3 {
  font-size: 1.3rem;
}

.project-card p {
  font-size: 0.9rem;
  color: var(--text-subtle);
  line-height: 1.7;
  flex: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.25rem;
}

.tag {
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  transition: all var(--transition);
}

.project-card:hover .tag {
  border-color: rgba(124, 58, 237, 0.2);
}

.tag-hw {
  background: rgba(20, 184, 166, 0.08);
  border-color: rgba(20, 184, 166, 0.2);
  color: #2dd4bf;
}

/* =========================================
   SKILLS
   ========================================= */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.skill-group {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--transition), transform var(--transition);
}

.skill-group:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.skill-group-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  font-family: 'JetBrains Mono', monospace;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 500;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: var(--text-subtle);
  transition: all var(--transition);
  cursor: default;
}

.skill-tag:hover {
  background: rgba(124, 58, 237, 0.1);
  border-color: rgba(124, 58, 237, 0.35);
  color: var(--text);
  transform: translateY(-1px);
}

/* =========================================
   CONTACT
   ========================================= */
.contact-inner {
  text-align: center;
}

.contact-inner .section-label,
.contact-inner .section-title {
  text-align: center;
}

.contact-inner .section-title {
  margin-bottom: 1rem;
}

.contact-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 500px;
  margin: 0 auto 3rem;
  line-height: 1.75;
}

.contact-cards {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 520px;
  margin: 0 auto;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
  text-align: left;
}

.contact-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}

.contact-card-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  flex-shrink: 0;
}

.contact-card-text {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.contact-card-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
}

.contact-card-value {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  margin-top: 0.1rem;
}

.contact-arrow {
  color: var(--text-muted);
  flex-shrink: 0;
  transition: transform var(--transition), color var(--transition);
}

.contact-card:hover .contact-arrow {
  transform: translate(2px, -2px);
  color: var(--accent);
}

/* =========================================
   FOOTER
   ========================================= */
.footer {
  border-top: 1px solid var(--border);
  padding: 2rem;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

/* =========================================
   ANIMATIONS
   ========================================= */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hero-content {
  animation: fadeInUp 0.9s ease both;
}

/* =========================================
   RESPONSIVE
   ========================================= */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

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

  .project-featured {
    grid-column: span 1;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .about-stats {
    flex-direction: row;
    min-width: unset;
  }

  .stat-card {
    flex: 1;
  }

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

  .section {
    padding: 5rem 1.5rem;
  }

  .hero {
    padding: calc(var(--nav-h) + 3rem) 1.5rem 5rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 0.75rem;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    justify-content: center;
  }

  .about-stats {
    flex-direction: column;
  }
}