/* ============================================================
   SOHAM WALIMBE PORTFOLIO – style.css
   ============================================================ */

/* ---------- CSS Variables ---------- */
:root {
  --clr-bg: #0d1117;
  --clr-surface: #161b22;
  --clr-surface-hover: #1f262f;
  --clr-border: #30363d;
  --clr-accent: #58a6ff;
  --clr-accent-dim: #1f3a5a;
  --clr-text: #e6edf3;
  --clr-text-secondary: #8b949e;
  --clr-tag: #21262d;
  --clr-tag-text: #79c0ff;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --radius: 8px;
  --nav-h: 64px;
  --max-w: 1100px;
  --transition: 0.2s ease;
}

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

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

body {
  font-family: var(--font);
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--clr-accent); text-decoration: none; transition: opacity var(--transition); }
a:hover { opacity: 0.8; }

ul { list-style: none; }

img { max-width: 100%; }

/* ---------- Utility ---------- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 80px 0;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 48px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  display: block;
  width: 50%;
  height: 3px;
  background: var(--clr-accent);
  border-radius: 2px;
  margin-top: 8px;
}

.subsection-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 40px 0 16px;
  color: var(--clr-text);
}

/* ---------- Navbar ---------- */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--clr-border);
  z-index: 1000;
  transition: background var(--transition);
}

.nav-container {
  max-width: var(--max-w);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  text-decoration: none;
  flex-shrink: 0;
}

/* "SW" initials layer */
.nav-logo-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--clr-accent);
  letter-spacing: 0.05em;
  /* start visible */
  opacity: 1;
  transform: scale(1);
  transition:
    opacity 0.45s cubic-bezier(0.4, 0, 0.2, 1),
    transform 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Photo layer */
.nav-logo-photo-wrap {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  padding: 2px;
  background: linear-gradient(135deg, var(--clr-accent) 0%, #1f3a5a 60%, var(--clr-accent) 100%);
  /* start hidden */
  opacity: 0;
  transform: scale(0.3) rotate(-90deg);
  transition:
    opacity 0.45s cubic-bezier(0.4, 0, 0.2, 1),
    transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1); /* springy overshoot */
}

.nav-logo-photo {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  display: block;
  border: 2px solid var(--clr-bg);
}

/* ---- Active state: photo visible, text hidden ---- */
#navbar.photo-active .nav-logo-text {
  opacity: 0;
  transform: scale(0.4) rotate(45deg);
}

#navbar.photo-active .nav-logo-photo-wrap {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

/* Subtle glow pulse on the nav photo once visible */
#navbar.photo-active .nav-logo-photo-wrap {
  animation: nav-photo-glow 3s ease-in-out infinite;
}

@keyframes nav-photo-glow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(88, 166, 255, 0.0); }
  50%       { box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.35); }
}

.nav-links {
  display: flex;
  gap: 32px;
}

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

.nav-links a:hover {
  color: var(--clr-text);
  opacity: 1;
}

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

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--clr-text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* ---------- Hero ---------- */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 0 24px;
  background: radial-gradient(ellipse at 60% 40%, #1a2a3a 0%, var(--clr-bg) 65%);
}

.hero-content {
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  padding-top: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
}

.hero-text {
  flex: 1;
  min-width: 0;
}

/* Photo column */
.hero-photo-wrap {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-photo-ring {
  width: 260px;
  height: 260px;
  border-radius: 50%;
  padding: 4px;
  background: linear-gradient(135deg, var(--clr-accent) 0%, #1f3a5a 60%, var(--clr-accent) 100%);
  box-shadow: 0 0 32px rgba(88, 166, 255, 0.25);
  animation: ring-pulse 4s ease-in-out infinite;
}

@keyframes ring-pulse {
  0%, 100% { box-shadow: 0 0 28px rgba(88, 166, 255, 0.2); }
  50%       { box-shadow: 0 0 48px rgba(88, 166, 255, 0.45); }
}

.hero-photo {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  display: block;
  border: 3px solid var(--clr-bg);
}

.hero-greeting {
  color: var(--clr-accent);
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 8px;
}

.hero-name {
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.hero-tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.6rem);
  color: var(--clr-text-secondary);
  font-weight: 400;
  margin-bottom: 20px;
}

.hero-sub {
  max-width: 560px;
  color: var(--clr-text-secondary);
  font-size: 1rem;
  margin-bottom: 36px;
  line-height: 1.8;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 26px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: 1.5px solid transparent;
}

.btn-primary {
  background: var(--clr-accent);
  color: #0d1117;
  border-color: var(--clr-accent);
}

.btn-primary:hover {
  background: #79b9ff;
  border-color: #79b9ff;
  opacity: 1;
}

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

.btn-outline:hover {
  background: var(--clr-accent-dim);
  opacity: 1;
}

.hero-links {
  display: flex;
  gap: 24px;
}

.hero-links a {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--clr-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}

.hero-links a:hover {
  color: var(--clr-text);
  opacity: 1;
}

/* ---------- About ---------- */
#about {
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  border-bottom: 1px solid var(--clr-border);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.about-text p {
  color: var(--clr-text-secondary);
  margin-bottom: 16px;
  font-size: 0.975rem;
}

.about-text strong {
  color: var(--clr-text);
}

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

.stat-card {
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: border-color var(--transition);
}

.stat-card:hover {
  border-color: var(--clr-accent);
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--clr-accent);
  line-height: 1;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--clr-text-secondary);
  font-weight: 500;
}

/* ---------- Timeline ---------- */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--clr-border);
}

.timeline-item {
  position: relative;
  margin-bottom: 48px;
}

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

.timeline-dot {
  position: absolute;
  left: -29px;
  top: 6px;
  width: 14px;
  height: 14px;
  background: var(--clr-accent);
  border-radius: 50%;
  border: 2px solid var(--clr-bg);
}

.timeline-content {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color var(--transition);
}

.timeline-content:hover {
  border-color: var(--clr-accent);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 6px;
}

.timeline-header h3 {
  font-size: 1.05rem;
  font-weight: 600;
}

.timeline-date {
  font-size: 0.8rem;
  color: var(--clr-accent);
  background: var(--clr-accent-dim);
  padding: 3px 10px;
  border-radius: 20px;
  font-weight: 500;
  white-space: nowrap;
}

.timeline-company {
  font-size: 0.85rem;
  color: var(--clr-text-secondary);
  margin-bottom: 16px;
}

.timeline-content ul {
  list-style: disc;
  padding-left: 20px;
}

.timeline-content li {
  font-size: 0.9rem;
  color: var(--clr-text-secondary);
  margin-bottom: 6px;
}

.timeline-content li strong {
  color: var(--clr-text);
}

/* ---------- Projects ---------- */
#projects {
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  border-bottom: 1px solid var(--clr-border);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color var(--transition), transform var(--transition);
}

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

.project-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--clr-tag-text);
  background: var(--clr-tag);
  border: 1px solid #30363d;
  padding: 3px 10px;
  border-radius: 20px;
  width: fit-content;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-card h3 {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.3;
}

.project-card p {
  font-size: 0.875rem;
  color: var(--clr-text-secondary);
  flex: 1;
  line-height: 1.7;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.project-tech span {
  font-size: 0.75rem;
  color: var(--clr-tag-text);
  background: var(--clr-tag);
  border: 1px solid var(--clr-border);
  padding: 2px 10px;
  border-radius: 20px;
}

.project-link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--clr-accent);
}

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

.skill-category {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color var(--transition);
}

.skill-category:hover {
  border-color: var(--clr-accent);
}

.skill-category h3 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--clr-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-tags span {
  font-size: 0.8rem;
  color: var(--clr-text);
  background: var(--clr-tag);
  border: 1px solid var(--clr-border);
  padding: 4px 12px;
  border-radius: 20px;
}

/* ---------- Education & Certs ---------- */
#education {
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  border-bottom: 1px solid var(--clr-border);
}

.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 12px;
}

.edu-card {
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 20px 22px;
  transition: border-color var(--transition);
}

.edu-card:hover {
  border-color: var(--clr-accent);
}

.edu-card h3 {
  font-size: 0.975rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.edu-institute {
  font-size: 0.85rem;
  color: var(--clr-accent);
  margin-bottom: 6px;
}

.edu-meta {
  font-size: 0.8rem;
  color: var(--clr-text-secondary);
}

.cert-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cert-list li {
  font-size: 0.9rem;
  color: var(--clr-text-secondary);
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 12px 16px;
}

/* ---------- Learning & Certifications ---------- */
#learning {
  background: var(--clr-bg);
  border-bottom: 1px solid var(--clr-border);
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

.course-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color var(--transition), transform var(--transition);
}

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

.course-card h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}

.course-card p {
  font-size: 0.85rem;
  color: var(--clr-text-secondary);
  margin-bottom: 16px;
}

.course-status {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: #ffab70;
  background: rgba(255, 171, 112, 0.1);
  border: 1px solid rgba(255, 171, 112, 0.3);
  padding: 3px 10px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.cert-item {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 16px 20px;
  color: var(--clr-text);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.cert-item:hover {
  background: var(--clr-surface-hover);
  border-color: var(--clr-accent);
  transform: translateY(-2px);
}

.cert-item svg {
  color: var(--clr-accent);
  flex-shrink: 0;
}


/* ---------- Contact ---------- */
.contact-sub {
  color: var(--clr-text-secondary);
  font-size: 1rem;
  margin-bottom: 36px;
  margin-top: -32px;
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 18px 20px;
  color: var(--clr-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: border-color var(--transition), color var(--transition), transform var(--transition);
}

.contact-card:hover {
  border-color: var(--clr-accent);
  color: var(--clr-text);
  transform: translateY(-2px);
  opacity: 1;
}

.contact-card svg {
  flex-shrink: 0;
  color: var(--clr-accent);
}

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--clr-border);
  padding: 32px 0;
  text-align: center;
}

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

.footer-sub {
  margin-top: 6px;
  font-size: 0.78rem !important;
  opacity: 0.6;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--clr-surface);
    border-bottom: 1px solid var(--clr-border);
    flex-direction: column;
    padding: 16px 24px 20px;
    gap: 16px;
  }

  .nav-links.open {
    display: flex;
  }

  .hamburger {
    display: flex;
  }

  .hero-content {
    flex-direction: column-reverse;
    text-align: center;
    gap: 32px;
  }

  .hero-links {
    justify-content: center;
  }

  .hero-cta {
    justify-content: center;
  }

  .hero-photo-ring {
    width: 180px;
    height: 180px;
  }

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

  .hero-name {
    font-size: clamp(2rem, 10vw, 3rem);
  }

  section {
    padding: 60px 0;
  }
}

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

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

  .hero-cta {
    flex-direction: column;
    align-items: flex-start;
  }
}