/* ==========================================================================
   Muhammad Hamza Rafeh - Portfolio
   Dark, tech-focused theme with blue/purple accents
   ========================================================================== */

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #0f1524;
  --bg-card: #131b2e;
  --border-color: rgba(255, 255, 255, 0.08);

  --text-primary: #e6edf7;
  --text-secondary: #93a1b8;

  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-cyan: #22d3ee;
  --gradient: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));

  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --section-pad: 7rem;
  --radius: 14px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.65;
  overflow-x: hidden;
}

h1, h2, h3, h4 { font-family: var(--font-heading); font-weight: 600; line-height: 1.2; }

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

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

::selection { background: var(--accent-purple); color: #fff; }

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent-blue); border-radius: 10px; }

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 2rem;
}

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

#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: -1;
  opacity: 0.35;
}

/* ---------------- Buttons ---------------- */
.btn {
  display: inline-block;
  padding: 0.85rem 1.8rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.25s ease;
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 0 0 rgba(139, 92, 246, 0);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(139, 92, 246, 0.35);
}

.btn-outline {
  border: 1px solid var(--accent-blue);
  color: var(--accent-blue);
  background: transparent;
}
.btn-outline:hover {
  background: rgba(59, 130, 246, 0.1);
  transform: translateY(-3px);
}

.full-width { width: 100%; text-align: center; }

/* ---------------- Navbar ---------------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  background: rgba(10, 14, 23, 0.75);
  border-bottom: 1px solid var(--border-color);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.logo {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  gap: 1.9rem;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  transition: color 0.2s ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient);
  transition: width 0.25s ease;
}
.nav-link:hover, .nav-link.active { color: var(--text-primary); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }

.nav-cv { font-size: 0.85rem; padding: 0.6rem 1.3rem; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
}
.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all 0.3s ease;
}

/* ---------------- Hero ---------------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: 6rem;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.eyebrow {
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  font-size: 0.95rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 12px var(--accent-cyan);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.hero-text h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  background: linear-gradient(135deg, #fff, #b9c6e0);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 0.6rem;
}

.role-line {
  font-size: clamp(1.2rem, 2.6vw, 1.8rem);
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 1.4rem;
}

.cursor { color: var(--accent-cyan); animation: blink 1s step-start infinite; }
@keyframes blink { 50% { opacity: 0; } }

.hero-desc {
  color: var(--text-secondary);
  max-width: 540px;
  margin-bottom: 2rem;
  font-size: 1.02rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  margin-bottom: 2.2rem;
  flex-wrap: wrap;
}

.hero-socials {
  display: flex;
  gap: 1.4rem;
  font-size: 1.4rem;
}
.hero-socials a { color: var(--text-secondary); transition: color 0.2s ease, transform 0.2s ease; }
.hero-socials a:hover { color: var(--accent-blue); transform: translateY(-3px); }

/* Terminal */
.terminal-window {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 30px 60px rgba(0,0,0,0.45);
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1rem;
  background: #0d1220;
  border-bottom: 1px solid var(--border-color);
}

.terminal-bar .dot { box-shadow: none; animation: none; }
.terminal-bar .dot.red { background: #ff5f56; }
.terminal-bar .dot.yellow { background: #ffbd2e; }
.terminal-bar .dot.green { background: #27c93f; }

.terminal-title {
  margin-left: 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.terminal-body {
  padding: 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
}
.terminal-body p { margin-bottom: 0.55rem; }
.terminal-body .prompt { color: var(--accent-cyan); margin-right: 0.4rem; }
.terminal-body .out { color: var(--accent-purple); padding-left: 1rem; }
.blink { animation: blink 1s step-start infinite; }

.scroll-down {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-secondary);
  animation: bounce 2s infinite;
}
@keyframes bounce {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 8px); }
}

/* ---------------- Sections ---------------- */
.section { padding: var(--section-pad) 0; }
.alt-bg { background: var(--bg-secondary); }

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.7rem;
}
.section-title .tag {
  font-family: var(--font-mono);
  color: var(--accent-blue);
  font-size: 1.1rem;
}
.section-sub {
  color: var(--text-secondary);
  margin-bottom: 3rem;
}
.section-title + .about-grid,
.section-title + .skills-grid,
.section-title + .timeline,
.section-title + .cert-grid,
.section-title + .extra-grid,
.section-title + .contact-grid {
  margin-top: 3rem;
}

/* ---------------- About ---------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr;
  gap: 3rem;
}
.about-text p { color: var(--text-secondary); margin-bottom: 1.1rem; }
.about-text strong { color: var(--text-primary); }

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.6rem;
  text-align: center;
  transition: transform 0.25s ease, border-color 0.25s ease;
}
.stat-card:hover { transform: translateY(-6px); border-color: var(--accent-blue); }
.stat-card i { font-size: 1.6rem; color: var(--accent-cyan); margin-bottom: 0.8rem; }
.stat-card h3 { font-size: 1.3rem; margin-bottom: 0.3rem; }
.stat-card p { color: var(--text-secondary); font-size: 0.85rem; }

/* ---------------- Skills ---------------- */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}
.skills-col h3 {
  font-size: 1.1rem;
  margin-bottom: 1.6rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text-primary);
}
.skills-col h3 i { color: var(--accent-purple); }
.tools-heading { margin-top: 2.4rem; }

.skill-bar { margin-bottom: 1.4rem; }
.skill-head {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}
.bar-track {
  height: 8px;
  border-radius: 6px;
  background: rgba(255,255,255,0.06);
  overflow: hidden;
}
.bar-fill {
  height: 100%;
  width: 0%;
  border-radius: 6px;
  background: var(--gradient);
  transition: width 1.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.badge-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}
.badge {
  font-size: 0.85rem;
  padding: 0.55rem 1rem;
  border-radius: 30px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.25s ease;
}
.badge:hover { border-color: var(--accent-blue); color: var(--text-primary); transform: translateY(-3px); }
.badge i { color: var(--accent-cyan); }
.badge.tool i { color: var(--accent-purple); }

/* ---------------- Timeline ---------------- */
.timeline {
  position: relative;
  padding-left: 2rem;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(var(--accent-blue), var(--accent-purple));
}
.timeline-item {
  position: relative;
  margin-bottom: 2.6rem;
}
.timeline-item:last-child { margin-bottom: 0; }
.timeline-dot {
  position: absolute;
  left: -2rem;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
}
.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.6rem 1.8rem;
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.timeline-content:hover { border-color: var(--accent-blue); transform: translateX(4px); }
.timeline-content h3 { font-size: 1.15rem; margin-bottom: 0.2rem; }
.timeline-role {
  display: block;
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-family: var(--font-mono);
  margin-bottom: 0.8rem;
}
.timeline-content p { color: var(--text-secondary); font-size: 0.92rem; margin-bottom: 0.9rem; }

.tag-row { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.mini-tag {
  font-size: 0.75rem;
  padding: 0.3rem 0.7rem;
  border-radius: 20px;
  background: rgba(59, 130, 246, 0.12);
  color: var(--accent-blue);
  border: 1px solid rgba(59, 130, 246, 0.25);
}
.mini-tag.lab {
  background: rgba(139, 92, 246, 0.12);
  color: var(--accent-purple);
  border-color: rgba(139, 92, 246, 0.3);
}

/* ---------------- Projects ---------------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(310px, 1fr));
  gap: 1.8rem;
}
.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.8rem;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
}
.project-card:hover {
  transform: translateY(-8px);
  border-color: var(--accent-purple);
  box-shadow: 0 20px 40px rgba(139, 92, 246, 0.15);
}
.project-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.2rem;
}
.project-icon { font-size: 1.6rem; color: var(--accent-cyan); }
.project-card h3 { font-size: 1.1rem; margin-bottom: 0.7rem; }
.project-card p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 1rem; }
.project-card .tag-row { margin-bottom: 1.1rem; }
.outcome {
  margin-top: auto;
  font-size: 0.85rem;
  color: var(--text-primary);
  border-top: 1px dashed var(--border-color);
  padding-top: 0.9rem;
}
.outcome i { color: var(--accent-cyan); margin-right: 0.4rem; }

/* ---------------- Certifications ---------------- */
.cert-grid { display: grid; gap: 1.5rem; }
.cert-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex;
  align-items: center;
  gap: 2rem;
  max-width: 640px;
}
.cert-ring {
  flex-shrink: 0;
  width: 100px;
  height: 100px;
  border-radius: 50%;
  border: 4px solid var(--accent-blue);
  border-top-color: var(--accent-purple);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-primary);
  animation: spin 6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.cert-ring span { animation: spin 6s linear infinite reverse; }
.cert-info h3 { margin-bottom: 0.5rem; }
.cert-info p { color: var(--text-secondary); font-size: 0.9rem; }

/* ---------------- Extracurricular ---------------- */
.extra-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.8rem;
}
.extra-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.8rem;
  text-align: center;
  transition: transform 0.25s ease, border-color 0.25s ease;
}
.extra-card:hover { transform: translateY(-6px); border-color: var(--accent-blue); }
.extra-card i { font-size: 1.8rem; color: var(--accent-purple); margin-bottom: 1rem; }
.extra-card h3 { margin-bottom: 0.6rem; font-size: 1.05rem; }
.extra-card p { color: var(--text-secondary); font-size: 0.9rem; }

/* ---------------- Contact ---------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}
.contact-info p { color: var(--text-secondary); margin-bottom: 1.6rem; }
.contact-link {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
  transition: color 0.2s ease, transform 0.2s ease;
}
.contact-link:hover { color: var(--accent-cyan); transform: translateX(6px); }
.contact-link i { color: var(--accent-blue); width: 20px; }

.contact-form { display: flex; flex-direction: column; gap: 1.1rem; }
.form-row input, .form-row textarea {
  width: 100%;
  padding: 0.9rem 1.1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  resize: vertical;
  transition: border-color 0.2s ease;
}
.form-row input:focus, .form-row textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
}

/* ---------------- Footer ---------------- */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 0;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}
.footer-socials { display: flex; gap: 1.4rem; font-size: 1.2rem; }
.footer-socials a { color: var(--text-secondary); transition: color 0.2s ease; }
.footer-socials a:hover { color: var(--accent-blue); }
.footer p { color: var(--text-secondary); font-size: 0.85rem; }

#back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: none;
  background: var(--gradient);
  color: #fff;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.3s ease;
  z-index: 90;
  box-shadow: 0 10px 25px rgba(59, 130, 246, 0.35);
}
#back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }

/* ---------------- Reveal on scroll ---------------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ---------------- Responsive ---------------- */
@media (max-width: 1024px) {
  .hero-inner, .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .about-stats { order: -1; }
  .skills-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  :root { --section-pad: 5rem; }
  .nav-links {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    flex-direction: column;
    align-items: center;
    padding: 2rem 0;
    gap: 1.6rem;
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-150%);
    transition: transform 0.3s ease;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-cv { display: none; }
  .hamburger { display: flex; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .cert-card { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .container { padding: 0 1.3rem; }
  .about-stats { grid-template-columns: 1fr; }
  .hero-buttons { flex-direction: column; }
  .hero-buttons .btn { text-align: center; }
}