/* ===========================
   CSS VARIABLES & RESET
=========================== */
:root {
  --bg: #0d0d0d;
  --bg-alt: #111111;
  --surface: #1a1a1a;
  --border: #2a2a2a;
  --accent: #00d4ff;
  --accent-dim: rgba(0, 212, 255, 0.1);
  --text: #e8e8e8;
  --text-muted: #888;
  --text-dim: #555;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --nav-height: 64px;
  --transition: 0.25s ease;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

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

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

ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ===========================
   UTILITIES
=========================== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.accent { color: var(--accent); }

.section {
  padding: 100px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 60px;
  letter-spacing: -0.02em;
}

/* ===========================
   BUTTONS
=========================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  outline: none;
  text-decoration: none;
}

.btn:focus-visible {
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.35);
}

.btn-primary {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: transparent;
  color: var(--accent);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

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

/* ===========================
   NAVIGATION
=========================== */
.nav-header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 100;
  background: rgba(13, 13, 13, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-height);
}

.nav {
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.04em;
}

.nav-links {
  display: flex;
  gap: 36px;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}

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

.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: all var(--transition);
}

/* ===========================
   HERO
=========================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: var(--nav-height);
  padding-bottom: 100px;
  background:
    radial-gradient(ellipse 60% 50% at 50% -10%, rgba(0, 212, 255, 0.08) 0%, transparent 70%),
    var(--bg);
}

.hero-content {
  max-width: 680px;
}

.hero-greeting {
  font-family: 'Fira Code', monospace;
  color: var(--accent);
  font-size: 1rem;
  margin-bottom: 12px;
}

.hero-name {
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: 12px;
}

.hero-title {
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  font-weight: 400;
  color: var(--text-muted);
  margin-bottom: 24px;
  min-height: 2.2rem;
  font-family: 'Fira Code', monospace;
}

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

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

.hero-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 40px;
  max-width: 520px;
}

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

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-dim);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.scroll-line {
  width: 1px;
  height: 50px;
  background: linear-gradient(to bottom, var(--text-dim), transparent);
  animation: scrollPulse 2s ease infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* ===========================
   ABOUT
=========================== */
.about-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 60px;
  align-items: start;
}

.about-avatar {
  position: sticky;
  top: calc(var(--nav-height) + 24px);
}

.avatar-img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  border: 3px solid var(--border);
  display: block;
  transition: border-color var(--transition);
}

.avatar-img:hover {
  border-color: var(--accent);
}

.avatar-placeholder {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: var(--surface);
  border: 3px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.04em;
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 20px;
}

.about-details {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 32px 0;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.detail-item {
  display: flex;
  gap: 16px;
  font-size: 0.9rem;
}

.detail-label {
  color: var(--text-dim);
  min-width: 110px;
}

.detail-value {
  color: var(--text);
  font-weight: 500;
}

.status-available {
  color: #4ade80;
  display: flex;
  align-items: center;
  gap: 6px;
}

.status-available::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #4ade80;
  box-shadow: 0 0 6px #4ade80;
  animation: pulse 2s ease infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ===========================
   SKILLS
=========================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: border-color var(--transition), transform var(--transition);
}

.skill-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.skill-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.skill-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.skill-card ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.skill-card li {
  color: var(--text-muted);
  font-size: 0.9rem;
  padding-left: 16px;
  position: relative;
}

.skill-card li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.75rem;
}

/* ===========================
   PROJECTS
=========================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.project-icon {
  font-size: 1.8rem;
}

.project-links {
  display: flex;
  gap: 12px;
}

.project-links a {
  color: var(--text-dim);
  transition: color var(--transition);
  display: flex;
  align-items: center;
}

.project-links a:hover {
  color: var(--accent);
}

.project-title {
  font-size: 1.1rem;
  font-weight: 600;
}

.project-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  flex: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.tag {
  background: var(--accent-dim);
  color: var(--accent);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-family: 'Fira Code', monospace;
  font-weight: 500;
}

/* ===========================
   CONTACT
=========================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 60px;
  align-items: start;
}

.contact-info p {
  color: var(--text-muted);
  margin-bottom: 32px;
  font-size: 1.05rem;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: color var(--transition);
}

.contact-link:hover {
  color: var(--accent);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
}

.form-group input,
.form-group textarea {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color var(--transition);
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-dim);
}

.form-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
  min-height: 1.2em;
}

/* ===========================
   STATS
=========================== */
.stats-section {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 52px 0;
}

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

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent);
  font-family: 'Fira Code', monospace;
  letter-spacing: -0.04em;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ===========================
   BACK TO TOP
=========================== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: #000;
  border: none;
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--transition), transform var(--transition), background var(--transition);
  z-index: 99;
  display: flex;
  align-items: center;
  justify-content: center;
  outline: none;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.back-to-top:hover {
  background: #fff;
}

/* ===========================
   EXPERIENCE (date + location)
=========================== */
.exp-date {
  font-size: 0.78rem;
  font-family: 'Fira Code', monospace;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 3px 8px;
  border-radius: 6px;
}

.exp-location {
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-top: -4px;
}

/* ===========================
   EDUCATION
=========================== */
.education {
  margin-top: 60px;
}

.edu-title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 24px;
  color: var(--text-muted);
}

.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}

.edu-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.edu-year {
  font-family: 'Fira Code', monospace;
  font-size: 0.78rem;
  color: var(--accent);
  white-space: nowrap;
  margin-top: 3px;
}

.edu-card strong {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.edu-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0;
}

.edu-equiv {
  color: var(--text-dim) !important;
  font-style: italic;
  margin-top: 4px !important;
}

/* ===========================
   FOOTER
=========================== */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

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

.footer strong {
  color: var(--text-muted);
}

.footer-sub {
  margin-top: 6px;
  font-size: 0.78rem !important;
}

/* ===========================
   ANIMATIONS (scroll reveal)
=========================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===========================
   RESPONSIVE
=========================== */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    gap: 0;
    padding: 16px 0;
    transform: translateY(-120%);
    transition: transform var(--transition);
  }

  .nav-links.open {
    transform: translateY(0);
  }

  .nav-links li a {
    display: block;
    padding: 14px 24px;
    font-size: 1rem;
  }

  .nav-burger {
    display: flex;
  }

  .nav-burger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .nav-burger.active span:nth-child(2) {
    opacity: 0;
  }
  .nav-burger.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-avatar {
    position: static;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-scroll {
    display: none;
  }
}

@media (max-width: 480px) {
  .section { padding: 70px 0; }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
}