/* ============================================================
   Portfolio Styles - Md Sazzad Hossain
   DEBUG FRIENDLY: Clear section comments & logical ordering
   ============================================================ */

/* -------------------- CSS Variables -------------------- */
:root {
  --bg: #0D0F12;
  --surface: #1A1D23;
  --surface-hover: #21262E;
  --accent: #3B82F6;
  --accent-hover: #2563EB;
  --text: #F3F4F6;
  --text-dim: #9CA3AF;
  --border: #2D333B;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

h1, h2, h3, h4 {
  font-family: 'Space Grotesk', sans-serif;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* -------------------- Layout Utilities -------------------- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* -------------------- Navbar -------------------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(13, 15, 18, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  padding: 1rem 0;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
}

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

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
}

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

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

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
}

/* -------------------- Hero Section -------------------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
}

.hero-content {
  max-width: 800px;
}

.hero-role {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.1rem;
  color: var(--accent);
  margin-bottom: 1rem;
  min-height: 1.5em;
}

.hero-name {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1rem;
}

.hero-tagline {
  font-size: 1.1rem;
  color: var(--text-dim);
  margin-bottom: 2rem;
  max-width: 600px;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.btn {
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s;
  display: inline-block;
  border: none;
  cursor: pointer;
}

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

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

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

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

.stats-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.stat-item {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: var(--text-dim);
}

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

/* -------------------- Section Base -------------------- */
section {
  padding: 5rem 0;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  color: var(--text-dim);
  margin-bottom: 3rem;
}

/* -------------------- About Section -------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about-text {
  color: var(--text-dim);
  line-height: 1.8;
}

.highlight-cards {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: transform 0.2s, border-color 0.2s;
}

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

.card-icon {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

.card p {
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.6;
}

/* -------------------- Skills Section -------------------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
}

.skill-card h3 {
  font-size: 1rem;
  margin-bottom: 1rem;
  color: var(--accent);
}

.skill-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-family: 'JetBrains Mono', monospace;
}

/* -------------------- Projects Section -------------------- */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: transform 0.2s;
}

.project-card:hover {
  transform: translateY(-2px);
}

.project-card.featured {
  grid-column: 1 / -1;
  border-color: var(--accent);
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.project-title {
  font-size: 1.15rem;
  font-weight: 600;
}

.status-badge {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: #4ADE80;
  font-family: 'JetBrains Mono', monospace;
}

.pulse {
  width: 8px;
  height: 8px;
  background: #4ADE80;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.7); }
  70% { box-shadow: 0 0 0 6px rgba(74, 222, 128, 0); }
  100% { box-shadow: 0 0 0 0 rgba(74, 222, 128, 0); }
}

.project-desc {
  color: var(--text-dim);
  font-size: 0.95rem;
  margin-bottom: 1rem;
  line-height: 1.6;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.project-link {
  font-size: 0.9rem;
  font-weight: 500;
}

.project-link::after {
  content: " ->";
}

/* -------------------- Experience Section -------------------- */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: 3rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -2rem;
  top: 0.3rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg);
  margin-left: -5px;
}

.timeline-content h3 {
  font-size: 1.1rem;
  margin-bottom: 0.2rem;
}

.timeline-meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 1rem;
}

.timeline-list {
  list-style: none;
  color: var(--text-dim);
  font-size: 0.95rem;
}

.timeline-list li {
  padding-left: 1.2rem;
  position: relative;
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.timeline-list li::before {
  content: ">";
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* -------------------- Contact Section -------------------- */
.contact-section {
  text-align: center;
}

.contact-section .section-subtitle {
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 2rem;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--text);
  transition: border-color 0.2s;
}

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

.contact-link svg {
  width: 18px;
  height: 18px;
}

/* -------------------- Footer -------------------- */
.footer {
  padding: 2rem 0;
 blockage  text-align: center;
  border-top: 1px solid var(--border);
}

.footer p {
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* -------------------- Mobile Navigation -------------------- */
.mobile-nav {
  display: none;
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 1rem;
  z-index: 999;
}

.mobile-nav.active {
  display: block;
}

.mobile-nav a {
  display: block;
  padding: 0.75rem 0;
  color: var(--text);
  border-bottom: 1px solid var(--border);
}

.mobile-nav a:last-child {
  border-bottom: none;
}

/* -------------------- Responsive: Tablet -------------------- */
@media (max-width: 968px) {
  .about-grid {
    grid-template-columns: 1fr;
  }

  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

/* -------------------- Responsive: Mobile -------------------- */
@media (max-width: 640px) {
  .hero-name {
    font-size: 2.2rem;
  }

  .nav-links {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

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

  .stats-bar {
    flex-direction: column;
    gap: 1rem;
  }

  .cta-buttons {
    flex-direction: column;
  }

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