/* ============================================================
   ROHAN PATIL — Portfolio CSS
   ============================================================ */

/* ---------- CSS Variables ---------- */
:root {
  --bg-dark:       #0a0e1a;
  --bg-card:       rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --border:        rgba(255, 255, 255, 0.08);
  --border-glow:   rgba(99, 179, 237, 0.4);

  --accent-blue:   #63b3ed;
  --accent-purple: #9f7aea;
  --accent-cyan:   #4fd1c5;
  --accent-pink:   #f687b3;
  --accent-orange: #f6ad55;

  --text-primary:  #f0f4ff;
  --text-secondary:#a0aec0;
  --text-muted:    #718096;

  --gradient-hero: linear-gradient(135deg, #0a0e1a 0%, #0d1b3e 50%, #0a0e1a 100%);
  --gradient-accent: linear-gradient(135deg, #63b3ed, #9f7aea);
  --gradient-card:   linear-gradient(135deg, rgba(99,179,237,0.1), rgba(159,122,234,0.1));

  --font-main: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --radius: 16px;
  --radius-sm: 8px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 40px rgba(99, 179, 237, 0.15);
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  background: var(--bg-dark);
  color: var(--text-primary);
  font-family: var(--font-main);
  line-height: 1.7;
  overflow-x: hidden;
}

::selection { background: rgba(99,179,237,0.3); color: #fff; }

a { color: var(--accent-blue); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-cyan); }

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

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--accent-blue); border-radius: 3px; }

/* ---------- Animated Background ---------- */
.bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.18;
  animation: orbFloat 12s ease-in-out infinite;
}
.bg-orb:nth-child(1) {
  width: 600px; height: 600px;
  background: radial-gradient(circle, #63b3ed, transparent);
  top: -200px; left: -200px;
  animation-delay: 0s;
}
.bg-orb:nth-child(2) {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #9f7aea, transparent);
  top: 40%; right: -150px;
  animation-delay: -4s;
}
.bg-orb:nth-child(3) {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #4fd1c5, transparent);
  bottom: -100px; left: 30%;
  animation-delay: -8s;
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%       { transform: translate(30px, -40px) scale(1.05); }
  66%       { transform: translate(-20px, 20px) scale(0.95); }
}

/* Particle grid */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(99,179,237,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99,179,237,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* ---------- Layout ---------- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

section { padding: 100px 0; }

/* ---------- Navigation ---------- */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: background var(--transition), backdrop-filter var(--transition);
}
nav.scrolled {
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.2rem;
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.3px;
  position: relative;
  padding-bottom: 6px;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 2px;
  background: var(--gradient-accent);
  border-radius: 1px;
  transition: width var(--transition);
}
.nav-links a:hover { color: var(--text-primary); }
.nav-links a:hover::after { width: 100%; }

.nav-cta {
  background: var(--gradient-accent);
  color: #fff !important;
  -webkit-text-fill-color: #fff !important;
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  transition: opacity var(--transition), transform var(--transition);
}
.nav-cta:hover { opacity: 0.85; transform: translateY(-1px); color: #fff; }
.nav-cta::after { display: none !important; }

/* ---------- Hero ---------- */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(99,179,237,0.1);
  border: 1px solid rgba(99,179,237,0.25);
  color: var(--accent-blue);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 24px;
  animation: fadeInDown 0.6s ease both;
}
.hero-badge .dot {
  width: 6px; height: 6px;
  background: var(--accent-cyan);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(1.4); }
}

.hero-name {
  font-size: clamp(2.8rem, 5vw, 4.2rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -2px;
  margin-bottom: 12px;
  animation: fadeInUp 0.7s ease 0.1s both;
}

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

.hero-title {
  font-size: 1.2rem;
  color: var(--text-secondary);
  font-weight: 400;
  margin-bottom: 24px;
  animation: fadeInUp 0.7s ease 0.2s both;
}

.hero-title .typed-cursor {
  color: var(--accent-blue);
  animation: blink 1s step-end infinite;
}

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

.hero-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 480px;
  margin-bottom: 36px;
  animation: fadeInUp 0.7s ease 0.3s both;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeInUp 0.7s ease 0.4s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 20px rgba(99,179,237,0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(99,179,237,0.45);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  transform: translateY(-2px);
  background: rgba(99,179,237,0.05);
}

.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 48px;
  animation: fadeInUp 0.7s ease 0.5s both;
}

.stat-item { text-align: center; }
.stat-number {
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}
.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 4px;
}

/* Hero Visual */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  animation: fadeInRight 0.8s ease 0.3s both;
}

.avatar-wrapper {
  position: relative;
  width: 320px;
  height: 320px;
}

.avatar-ring {
  position: absolute;
  inset: -20px;
  border-radius: 50%;
  border: 2px solid transparent;
  background: linear-gradient(var(--bg-dark), var(--bg-dark)) padding-box,
              var(--gradient-accent) border-box;
  animation: spin 8s linear infinite;
}
.avatar-ring::before {
  content: '';
  position: absolute;
  top: -4px; left: 50%;
  transform: translateX(-50%);
  width: 10px; height: 10px;
  background: var(--accent-blue);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--accent-blue);
}

@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

.avatar-img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--border);
  position: relative;
  z-index: 1;
}

/* Fallback avatar (initials) */
.avatar-fallback {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: linear-gradient(135deg, #1a2a4a, #2d1b4e);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  border: 3px solid var(--border);
  position: relative;
  z-index: 1;
  letter-spacing: -4px;
}

.floating-badge {
  position: absolute;
  background: rgba(10,14,26,0.9);
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  white-space: nowrap;
  box-shadow: var(--shadow);
  animation: floatBadge 3s ease-in-out infinite;
  z-index: 2;
}
.floating-badge .badge-icon { font-size: 1.1rem; }
.floating-badge:nth-child(3) { top: 10px; right: -30px; animation-delay: 0s; }
.floating-badge:nth-child(4) { bottom: 30px; left: -40px; animation-delay: -1.5s; }
.floating-badge:nth-child(5) { top: 50%; right: -50px; transform: translateY(-50%); animation-delay: -0.8s; }

@keyframes floatBadge {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-8px); }
}
.floating-badge:nth-child(5) {
  animation: floatBadge5 3s ease-in-out infinite;
  animation-delay: -0.8s;
}
@keyframes floatBadge5 {
  0%, 100% { transform: translateY(-50%); }
  50%       { transform: translateY(calc(-50% - 8px)); }
}

/* ---------- Section Headers ---------- */
.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  color: var(--accent-blue);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.2;
  margin-bottom: 16px;
}

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

.section-desc {
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto;
  font-size: 1rem;
}

.section-divider {
  width: 60px;
  height: 3px;
  background: var(--gradient-accent);
  border-radius: 2px;
  margin: 16px auto 0;
}

/* ---------- About ---------- */
#about { background: rgba(255,255,255,0.01); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-size: 1rem;
}

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 32px;
}

.highlight-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: all var(--transition);
}
.highlight-item:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}
.highlight-icon { font-size: 1.4rem; }
.highlight-text { font-size: 0.85rem; font-weight: 600; color: var(--text-primary); }

.about-visual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.about-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transition: transform var(--transition);
}
.about-card:hover::before { transform: scaleX(1); }
.about-card:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.about-card:nth-child(1) { grid-column: span 2; }

.about-card-icon { font-size: 2rem; margin-bottom: 12px; }
.about-card-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}
.about-card-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ---------- Tech Stack ---------- */
#skills { position: relative; }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.skill-category::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-card);
  opacity: 0;
  transition: opacity var(--transition);
}
.skill-category:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.skill-category:hover::after { opacity: 1; }

.skill-cat-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  position: relative;
  z-index: 1;
}
.skill-cat-icon { font-size: 1.5rem; }
.skill-cat-name {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-blue);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  position: relative;
  z-index: 1;
}

.skill-tag {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 5px 12px;
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 500;
  transition: all var(--transition);
  cursor: default;
}
.skill-tag:hover {
  background: rgba(99,179,237,0.12);
  border-color: rgba(99,179,237,0.4);
  color: var(--accent-blue);
  transform: translateY(-1px);
}

/* ---------- Experience ---------- */
#experience { background: rgba(255,255,255,0.01); }

.timeline {
  position: relative;
  padding-left: 40px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-blue), var(--accent-purple), transparent);
}

.timeline-item {
  position: relative;
  margin-bottom: 48px;
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.timeline-item.visible {
  opacity: 1;
  transform: translateX(0);
}

.timeline-dot {
  position: absolute;
  left: -34px;
  top: 6px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent-blue);
  border: 3px solid var(--bg-dark);
  box-shadow: 0 0 12px rgba(99,179,237,0.6);
  z-index: 1;
}
.timeline-dot.purple { background: var(--accent-purple); box-shadow: 0 0 12px rgba(159,122,234,0.6); }
.timeline-dot.cyan   { background: var(--accent-cyan);   box-shadow: 0 0 12px rgba(79,209,197,0.6); }

.timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
  transition: all var(--transition);
}
.timeline-card:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-glow);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 8px;
}

.timeline-role {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.timeline-period {
  background: rgba(99,179,237,0.1);
  border: 1px solid rgba(99,179,237,0.2);
  color: var(--accent-blue);
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 600;
  white-space: nowrap;
}

.timeline-company {
  color: var(--accent-purple);
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.timeline-achievements {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.timeline-achievements li {
  color: var(--text-secondary);
  font-size: 0.9rem;
  padding-left: 20px;
  position: relative;
}
.timeline-achievements li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
  font-size: 0.8rem;
}

.project-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}
.project-chip {
  background: rgba(159,122,234,0.1);
  border: 1px solid rgba(159,122,234,0.25);
  color: var(--accent-purple);
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
}

/* ---------- Projects ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.project-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.project-card:hover::before { transform: scaleX(1); }
.project-card:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
}

.project-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.project-name {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.project-desc {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.6;
  flex: 1;
  margin-bottom: 20px;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.project-tech span {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 0.72rem;
  font-family: var(--font-mono);
}

.project-links {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}
.project-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  transition: color var(--transition);
}
.project-link:hover { color: var(--accent-blue); }

/* ---------- Education & Certs ---------- */
#education { background: rgba(255,255,255,0.01); }

.edu-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.edu-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.edu-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--gradient-accent);
}
.edu-card:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.edu-icon { font-size: 2rem; margin-bottom: 12px; }
.edu-degree { font-size: 1rem; font-weight: 700; margin-bottom: 4px; }
.edu-school { color: var(--accent-blue); font-size: 0.9rem; font-weight: 600; margin-bottom: 8px; }
.edu-year {
  color: var(--text-muted);
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  gap: 6px;
}
.edu-score {
  display: inline-block;
  background: rgba(99,179,237,0.1);
  border: 1px solid rgba(99,179,237,0.2);
  color: var(--accent-blue);
  padding: 2px 10px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 700;
  margin-top: 10px;
}

.cert-card {
  background: linear-gradient(135deg, rgba(99,179,237,0.08), rgba(159,122,234,0.08));
  border: 1px solid rgba(99,179,237,0.2);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  align-items: center;
  gap: 20px;
  transition: all var(--transition);
  grid-column: span 2;
}
.cert-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.cert-icon { font-size: 3rem; flex-shrink: 0; }
.cert-info { flex: 1; }
.cert-name { font-size: 1.1rem; font-weight: 700; margin-bottom: 4px; }
.cert-issuer { color: var(--accent-orange); font-size: 0.9rem; font-weight: 600; margin-bottom: 8px; }
.cert-validity { color: var(--text-muted); font-size: 0.8rem; }
.cert-verify {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--gradient-accent);
  color: #fff;
  padding: 8px 18px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-top: 12px;
  transition: opacity var(--transition), transform var(--transition);
}
.cert-verify:hover { opacity: 0.85; transform: translateY(-1px); color: #fff; }

/* ---------- Contact ---------- */
#contact {
  text-align: center;
}

.contact-wrapper {
  max-width: 700px;
  margin: 0 auto;
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 48px 0;
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  transition: all var(--transition);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.contact-card:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
  color: var(--text-primary);
}
.contact-card-icon { font-size: 2rem; }
.contact-card-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}
.contact-card-value {
  font-size: 0.88rem;
  color: var(--text-primary);
  font-weight: 500;
  word-break: break-all;
}

.contact-cta {
  margin-top: 16px;
  font-size: 1rem;
  color: var(--text-secondary);
}

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  position: relative;
  z-index: 1;
}
footer span {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 600;
}

/* ---------- Scroll Animations ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}
.reveal-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Stagger delays */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }

/* ---------- Keyframes ---------- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-16px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInRight {
  from { opacity: 0; transform: translateX(40px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ---------- Mobile Menu ---------- */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.menu-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  section { padding: 72px 0; }

  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: rgba(10,14,26,0.97);
    backdrop-filter: blur(20px);
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border);
  }
  .menu-toggle { display: flex; }

  .hero-grid { grid-template-columns: 1fr; text-align: center; }
  .hero-visual { order: -1; }
  .hero-desc { margin: 0 auto 36px; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .avatar-wrapper { width: 220px; height: 220px; }
  .floating-badge { display: none; }

  .about-grid { grid-template-columns: 1fr; }
  .about-visual { grid-template-columns: repeat(3, 1fr); }
  .about-card:nth-child(1) { grid-column: span 3; }

  .skills-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .edu-grid { grid-template-columns: 1fr; }
  .cert-card { grid-column: span 1; flex-direction: column; text-align: center; }
  .contact-cards { grid-template-columns: 1fr; }

  .timeline { padding-left: 28px; }
  .timeline-dot { left: -22px; }
  .timeline-header { flex-direction: column; }
}

@media (max-width: 480px) {
  .about-highlights { grid-template-columns: 1fr; }
  .about-visual { grid-template-columns: 1fr 1fr; }
  .about-card:nth-child(1) { grid-column: span 2; }
}

/* ---------- Currently Learning grid ---------- */
.skills-grid--focus {
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 768px) {
  .skills-grid--focus { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .skills-grid--focus { grid-template-columns: 1fr; }
}

/* ============================================================
   AI PoC PROJECTS PAGE
   ============================================================ */

/* ---------- Architecture flow diagram ---------- */
.arch-flow {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  margin: 16px 0 0;
}
.arch-step {
  background: rgba(99,179,237,0.08);
  border: 1px solid rgba(99,179,237,0.2);
  color: var(--accent-blue);
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-family: var(--font-mono);
  white-space: nowrap;
}
.arch-arrow {
  color: var(--text-muted);
  font-size: 0.75rem;
}

/* ---------- PoC card ---------- */
.poc-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 40px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.poc-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 4px;
  background: var(--gradient-accent);
  border-radius: 2px 0 0 2px;
}
.poc-card:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-glow);
}

.poc-header {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.poc-icon {
  font-size: 2.8rem;
  line-height: 1;
  flex-shrink: 0;
}
.poc-title-block { flex: 1; min-width: 200px; }
.poc-title {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 6px;
  color: var(--text-primary);
}
.poc-subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
}
.poc-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: flex-start;
}
.poc-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  border-radius: 50px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.3px;
  text-transform: uppercase;
  white-space: nowrap;
}
.poc-badge--rag     { background: rgba(79,209,197,0.12); border: 1px solid rgba(79,209,197,0.3); color: var(--accent-cyan); }
.poc-badge--agent   { background: rgba(159,122,234,0.12); border: 1px solid rgba(159,122,234,0.3); color: var(--accent-purple); }
.poc-badge--lambda  { background: rgba(246,173,85,0.12); border: 1px solid rgba(246,173,85,0.3); color: var(--accent-orange); }
.poc-badge--summary { background: rgba(99,179,237,0.12); border: 1px solid rgba(99,179,237,0.3); color: var(--accent-blue); }

/* ---------- PoC card two-column body ---------- */
.poc-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.poc-section-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.poc-section-label i { color: var(--accent-blue); }

.poc-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.poc-features li {
  color: var(--text-secondary);
  font-size: 0.88rem;
  padding-left: 18px;
  position: relative;
  line-height: 1.5;
}
.poc-features li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
  font-size: 0.75rem;
  top: 2px;
}

.poc-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 24px 0;
}

.poc-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 24px;
}

.poc-github-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 10px 20px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--transition);
}
.poc-github-link:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  background: rgba(99,179,237,0.06);
  transform: translateY(-2px);
}

/* ---------- Use-case tags ---------- */
.use-cases {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 2px;
}
.use-case-tag {
  background: rgba(159,122,234,0.08);
  border: 1px solid rgba(159,122,234,0.2);
  color: var(--accent-purple);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 500;
}

/* ---------- AI Engineering Areas grid ---------- */
.areas-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.area-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  transition: all var(--transition);
}
.area-card:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}
.area-card-icon { font-size: 1.6rem; flex-shrink: 0; }
.area-card-name {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.area-card-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ---------- PoC projects list ---------- */
.poc-list {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* ---------- PoC page hero ---------- */
#poc-hero {
  min-height: 40vh;
  display: flex;
  align-items: center;
  padding: 140px 0 60px;
}
.poc-hero-inner { max-width: 720px; }
.poc-hero-inner .hero-badge { margin-bottom: 20px; }
.poc-hero-inner h1 {
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1.15;
  margin-bottom: 20px;
}
.poc-hero-inner p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
  max-width: 600px;
  margin-bottom: 28px;
}
.poc-hero-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

/* ---------- Uniform footer ---------- */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  position: relative;
  z-index: 1;
}
footer span {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 600;
}

/* ---------- PoC page responsive ---------- */
@media (max-width: 768px) {
  .poc-body   { grid-template-columns: 1fr; gap: 20px; }
  .poc-card   { padding: 24px 20px; }
  .poc-header { gap: 14px; }
  .areas-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .areas-grid { grid-template-columns: 1fr; }
}