/* ═══════════════════════════════════════════════════════════
   NIBAKARAN VEERAMUTHTHU — PORTFOLIO
   style.css
   ═══════════════════════════════════════════════════════════ */

/* ── Design Tokens ─────────────────────────────────────── */
:root {
  --bg-primary:      #f6f8fb;
  --bg-secondary:    #ffffff;
  --bg-dark:         #0f172a;
  --bg-darker:       #020617;
  --text-primary:    #0f172a;
  --text-secondary:  #475569;
  --text-light:      #f8fafc;
  --text-muted-dark: #94a3b8;
  --accent-primary:  #0ea5a4;
  --accent-secondary:#2563eb;
  --accent-soft:     #ccfbf1;
  --border-light:    #e5e7eb;
  --card-bg:         #ffffff;

  /* Typography */
  --font-heading: 'Manrope', system-ui, sans-serif;
  --font-body:    'Inter', system-ui, sans-serif;

  /* Spacing scale */
  --space-xs:  0.5rem;
  --space-sm:  0.75rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Layout */
  --container-max: 1200px;
  --container-pad: clamp(1rem, 5vw, 2rem);
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --border-radius-lg: 20px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md:  0 4px 12px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.04);
  --shadow-lg:  0 10px 30px rgba(0,0,0,.10), 0 4px 8px rgba(0,0,0,.06);
  --shadow-card:0 2px 8px rgba(14,165,164,.08);

  /* Transitions */
  --transition: 0.2s ease;
  --transition-md: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
input, textarea, button { font-family: inherit; }

/* Skip link */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* Focus visible */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ── Layout Utilities ───────────────────────────────────── */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.w-full { width: 100%; }

/* ── Buttons ────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius-sm);
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1;
  transition: background var(--transition), color var(--transition),
              border-color var(--transition), box-shadow var(--transition),
              transform var(--transition);
  min-height: 44px;
  white-space: nowrap;
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent-primary);
  color: #fff;
}
.btn-primary:hover, .btn-primary:focus-visible {
  background: #0b8f8e;
  box-shadow: 0 4px 16px rgba(14,165,164,.35);
}

.btn-outline {
  background: transparent;
  color: var(--accent-primary);
  border: 2px solid var(--accent-primary);
}
.btn-outline:hover, .btn-outline:focus-visible {
  background: var(--accent-primary);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 2px solid var(--border-light);
}
.btn-ghost:hover, .btn-ghost:focus-visible {
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

.btn-sm { padding: 0.5rem 1rem; font-size: 0.82rem; }

/* ── Sections ───────────────────────────────────────────── */
.section {
  padding-block: var(--space-4xl);
}
.section--dark {
  background: var(--bg-dark);
  color: var(--text-light);
}
.section--alt {
  background: var(--bg-secondary);
}

/* Section header */
.section-header {
  text-align: center;
  max-width: 640px;
  margin-inline: auto;
  margin-bottom: var(--space-3xl);
}

.section-label {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent-primary);
  margin-bottom: var(--space-sm);
}
.section-label--light { color: var(--accent-primary); }

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}
.section-title--light { color: var(--text-light); }

.section-sub {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
}
.section-sub--light { color: var(--text-muted-dark); }

/* ══════════════════════════════════════════════════════════
   HEADER
══════════════════════════════════════════════════════════ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(246,248,251,.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  transition: box-shadow var(--transition-md);
}
.site-header.scrolled { box-shadow: var(--shadow-md); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  height: 64px;
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  flex-shrink: 0;
}
.logo-mark {
  width: 36px; height: 36px;
  border-radius: 8px;
  background: var(--accent-primary);
  color: #fff;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 800;
  display: grid;
  place-items: center;
  letter-spacing: .02em;
}
.logo-text {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* Nav links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  list-style: none;
}
.nav-link {
  font-family: var(--font-heading);
  font-size: 0.87rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover { color: var(--text-primary); background: rgba(14,165,164,.06); }
.nav-link.active { color: var(--accent-primary); background: var(--accent-soft); }

/* Nav actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px; height: 44px;
  border-radius: 8px;
  transition: background var(--transition);
}
.hamburger:hover { background: rgba(0,0,0,.06); }
.hamburger-line {
  display: block;
  width: 22px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-md), opacity var(--transition-md);
}
.hamburger[aria-expanded="true"] .hamburger-line:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger[aria-expanded="true"] .hamburger-line:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] .hamburger-line:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.mobile-menu {
  display: none;
  padding: var(--space-lg) var(--container-pad) var(--space-xl);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-light);
  box-shadow: var(--shadow-lg);
}
.mobile-menu.open { display: block; }
.mobile-links { display: flex; flex-direction: column; gap: var(--space-xs); }
.mobile-link {
  display: block;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}
.mobile-link:hover { color: var(--text-primary); background: var(--bg-primary); }
.mobile-links li:last-child { margin-top: var(--space-sm); }

/* ══════════════════════════════════════════════════════════
   HERO
══════════════════════════════════════════════════════════ */
.hero {
  position: relative;
  padding-block: var(--space-4xl);
  overflow: hidden;
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: center;
}

/* Subtle abstract background */
.hero-bg-elements { position: absolute; inset: 0; pointer-events: none; }
.hero-circle {
  position: absolute;
  border-radius: 50%;
  opacity: .07;
}
.hero-circle--1 {
  width: 600px; height: 600px;
  top: -200px; right: -100px;
  background: radial-gradient(circle, var(--accent-primary), transparent);
}
.hero-circle--2 {
  width: 400px; height: 400px;
  bottom: -100px; left: -100px;
  background: radial-gradient(circle, var(--accent-secondary), transparent);
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(14,165,164,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14,165,164,.04) 1px, transparent 1px);
  background-size: 40px 40px;
}

.hero-grid-layout {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: var(--space-3xl);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content { max-width: 600px; }

.hero-eyebrow {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent-primary);
  margin-bottom: var(--space-lg);
}

.hero-heading {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.03em;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.hero-sub {
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: var(--space-2xl);
  max-width: 520px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
}

/* Info chips */
.hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.875rem;
  border-radius: 100px;
  border: 1px solid var(--border-light);
  background: var(--bg-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
}
.chip svg { color: var(--accent-primary); flex-shrink: 0; }

/* Portrait */
.hero-portrait { display: flex; justify-content: center; }
.portrait-wrapper {
  position: relative;
  width: 320px; height: 380px;
}
.portrait-placeholder {
  width: 100%; height: 100%;
  border-radius: var(--border-radius-lg);
  background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e1 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  border: 2px dashed var(--border-light);
}
.portrait-initials {
  font-family: var(--font-heading);
  font-size: 4rem;
  font-weight: 800;
  color: var(--text-secondary);
  opacity: .4;
}
.portrait-note {
  font-size: 0.78rem;
  color: var(--text-secondary);
  font-style: italic;
}
.portrait-accent {
  position: absolute;
  bottom: -16px; right: -16px;
  width: 100px; height: 100px;
  border-radius: 50%;
  background: var(--accent-soft);
  border: 4px solid var(--accent-primary);
  opacity: .6;
  z-index: -1;
}

/* Portrait image (when added) */
.portrait-wrapper img {
  width: 100%; height: 100%;
  object-fit: cover;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
}

/* ══════════════════════════════════════════════════════════
   EXPERTISE CARDS
══════════════════════════════════════════════════════════ */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
}

.expertise-card {
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius);
  padding: var(--space-2xl);
  transition: transform var(--transition-md), box-shadow var(--transition-md), border-color var(--transition-md);
  box-shadow: var(--shadow-sm);
}
.expertise-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-primary);
}
.expertise-icon {
  width: 56px; height: 56px;
  border-radius: 12px;
  background: var(--accent-soft);
  display: grid;
  place-items: center;
  margin-bottom: var(--space-lg);
  color: var(--accent-primary);
}
.expertise-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}
.expertise-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ══════════════════════════════════════════════════════════
   EXPERIENCE TIMELINE
══════════════════════════════════════════════════════════ */
.timeline {
  position: relative;
  max-width: 800px;
  margin-inline: auto;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0; bottom: 0;
  width: 2px;
  background: rgba(14,165,164,.25);
}

.timeline-item {
  position: relative;
  padding-left: 56px;
  margin-bottom: var(--space-2xl);
}
.timeline-item:last-child { margin-bottom: 0; }

.timeline-marker {
  position: absolute;
  left: 11px;
  top: 22px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--accent-primary);
  border: 3px solid var(--bg-dark);
  box-shadow: 0 0 0 3px rgba(14,165,164,.3);
}

.timeline-card {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--border-radius);
  padding: var(--space-2xl);
  transition: border-color var(--transition-md);
}
.timeline-card:hover { border-color: rgba(14,165,164,.4); }

.timeline-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
  flex-wrap: wrap;
}
.timeline-company {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--accent-primary);
  margin-bottom: 0.25rem;
}
.timeline-role {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-light);
}
.timeline-badge {
  flex-shrink: 0;
  display: inline-block;
  padding: 0.3rem 0.7rem;
  border-radius: 100px;
  background: rgba(14,165,164,.15);
  border: 1px solid rgba(14,165,164,.3);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-primary);
  white-space: nowrap;
}
.timeline-date {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--text-muted-dark);
  margin-bottom: var(--space-md);
}
.timeline-bullets {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
  padding-left: 1.2rem;
  list-style: disc;
}
.timeline-bullets li {
  font-size: 0.92rem;
  color: var(--text-muted-dark);
  line-height: 1.6;
  list-style: disc;
}

/* ── Tags ───────────────────────────────────────────────── */
.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: var(--space-md);
}
.tag {
  padding: 0.25rem 0.6rem;
  border-radius: 100px;
  background: rgba(14,165,164,.1);
  border: 1px solid rgba(14,165,164,.2);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-primary);
}

/* ══════════════════════════════════════════════════════════
   PROJECTS
══════════════════════════════════════════════════════════ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-md), box-shadow var(--transition-md), border-color var(--transition-md);
  box-shadow: var(--shadow-sm);
}
.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-primary);
}

.project-image {
  height: 180px;
  background: linear-gradient(135deg, #e2e8f0, #cbd5e1);
  overflow: hidden;
  flex-shrink: 0;
}
.project-img-placeholder {
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #f0f4f8, #e2e8f0);
  color: var(--text-secondary);
  opacity: .5;
}

.project-body {
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  flex: 1;
}
.project-category {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent-primary);
  margin-bottom: var(--space-xs);
}
.project-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  line-height: 1.3;
}
.project-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
  flex: 1;
  margin-bottom: var(--space-md);
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: auto;
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-light);
}
.project-link {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-primary);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: color var(--transition);
}
.project-link:hover { color: #0b8f8e; text-decoration: underline; }
.project-link--placeholder {
  color: var(--text-secondary);
  font-style: italic;
  font-weight: 400;
  font-size: 0.78rem;
  cursor: default;
}

/* ══════════════════════════════════════════════════════════
   ABOUT
══════════════════════════════════════════════════════════ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: var(--space-3xl);
  align-items: start;
}

.about-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}
.about-text:last-child { margin-bottom: 0; }

.detail-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
}
.detail-list { display: flex; flex-direction: column; gap: 0; }
.detail-row {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding-block: var(--space-md);
  border-bottom: 1px solid var(--border-light);
}
.detail-row:last-child { border-bottom: none; }
.detail-row--highlight {
  background: var(--accent-soft);
  margin-inline: calc(-1 * var(--space-xl));
  padding-inline: var(--space-xl);
  border-radius: 0 0 calc(var(--border-radius) - 2px) calc(var(--border-radius) - 2px);
  border-bottom: none;
}
.detail-row dt {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--text-secondary);
}
.detail-row dt svg { color: var(--accent-primary); }
.detail-row dd {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-primary);
  padding-left: 1.4rem;
}

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

.skill-group {
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-md);
}
.skill-group:hover { box-shadow: var(--shadow-md); }

.skill-group-title {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 2px solid var(--accent-soft);
}
.skill-group-title svg { color: var(--accent-primary); flex-shrink: 0; }

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.skill-tag {
  padding: 0.35rem 0.75rem;
  border-radius: 100px;
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.skill-tag:hover {
  background: var(--accent-soft);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* ══════════════════════════════════════════════════════════
   EDUCATION
══════════════════════════════════════════════════════════ */
.education-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  max-width: 1000px;
  margin-inline: auto;
}

.education-card {
  background: var(--card-bg);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-md), border-color var(--transition-md);
}
.education-card:hover { box-shadow: var(--shadow-md); border-color: var(--accent-primary); }
.education-card--active { border-color: var(--accent-primary); background: rgba(14,165,164,.02); }

.education-icon {
  flex-shrink: 0;
  width: 52px; height: 52px;
  border-radius: 12px;
  background: var(--accent-soft);
  display: grid;
  place-items: center;
  color: var(--accent-primary);
}
.education-institution {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--accent-primary);
  margin-bottom: 0.25rem;
}
.education-degree {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
  line-height: 1.3;
}
.education-meta {
  font-size: 0.82rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: var(--space-sm);
}
.education-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Status badge */
.status-badge {
  padding: 0.2rem 0.55rem;
  border-radius: 100px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: .04em;
}
.status-badge--active {
  background: rgba(14,165,164,.12);
  color: var(--accent-primary);
  border: 1px solid rgba(14,165,164,.3);
}

/* ══════════════════════════════════════════════════════════
   CONTACT
══════════════════════════════════════════════════════════ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: start;
}

.contact-sub {
  font-size: 1rem;
  color: var(--text-muted-dark);
  line-height: 1.75;
  margin-bottom: var(--space-2xl);
  max-width: 420px;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}
.contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  color: var(--text-muted-dark);
  font-size: 0.95rem;
  transition: color var(--transition);
}
.contact-item:hover { color: var(--text-light); }
.contact-item svg { flex-shrink: 0; color: var(--accent-primary); }
.contact-item--plain { cursor: default; }
.contact-item--plain:hover { color: var(--text-muted-dark); }

/* Contact form */
.contact-form-wrapper {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--border-radius-lg);
  padding: var(--space-2xl);
}

.contact-form { display: flex; flex-direction: column; gap: var(--space-lg); }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.form-field { display: flex; flex-direction: column; gap: 0.4rem; }

.form-label {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted-dark);
}
.form-label span { color: var(--accent-primary); }

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--border-radius-sm);
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.06);
  color: var(--text-light);
  font-size: 0.95rem;
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
  min-height: 44px;
}
.form-input::placeholder { color: rgba(148,163,184,.5); }
.form-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  background: rgba(255,255,255,.09);
  box-shadow: 0 0 0 3px rgba(14,165,164,.2);
}
.form-input.invalid { border-color: #ef4444; }

.form-textarea { resize: vertical; min-height: 120px; }

.form-error {
  font-size: 0.78rem;
  color: #f87171;
  min-height: 1.2em;
}

/* Submit button */
.btn-submit {
  align-self: flex-start;
  position: relative;
}
.btn-spinner {
  display: none;
  width: 16px; height: 16px;
  border: 2px solid rgba(255,255,255,.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
.btn-submit.loading .btn-text { opacity: 0; }
.btn-submit.loading .btn-spinner { display: block; position: absolute; }

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

/* Form status */
.form-status {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--border-radius-sm);
  font-size: 0.92rem;
  font-weight: 500;
}
.form-status[hidden] {
  display: none;
}
.form-status--success {
  background: rgba(16,185,129,.15);
  border: 1px solid rgba(16,185,129,.3);
  color: #6ee7b7;
}
.form-status--error {
  background: rgba(239,68,68,.12);
  border: 1px solid rgba(239,68,68,.25);
  color: #fca5a5;
}

/* ══════════════════════════════════════════════════════════
   FOOTER
══════════════════════════════════════════════════════════ */
.site-footer {
  background: var(--bg-darker);
  color: var(--text-muted-dark);
  padding-top: var(--space-4xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-3xl);
  padding-bottom: var(--space-3xl);
  border-bottom: 1px solid rgba(255,255,255,.06);
}

.footer-brand .nav-logo { margin-bottom: var(--space-lg); }
.footer-brand .logo-text { color: var(--text-light); }

.footer-tagline {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-muted-dark);
  max-width: 320px;
  margin-bottom: var(--space-lg);
}

.footer-socials {
  display: flex;
  gap: var(--space-sm);
}
.social-link {
  width: 40px; height: 40px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,.1);
  display: grid;
  place-items: center;
  color: var(--text-muted-dark);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.social-link:hover {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
  background: rgba(14,165,164,.1);
}

.footer-nav-title {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-light);
  margin-bottom: var(--space-lg);
}

.footer-nav ul, .footer-contact ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-nav a, .footer-contact a, .footer-contact span {
  font-size: 0.9rem;
  color: var(--text-muted-dark);
  transition: color var(--transition);
}
.footer-nav a:hover, .footer-contact a:hover { color: var(--text-light); }

.footer-bottom {
  padding-block: var(--space-lg);
}
.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}
.footer-copy, .footer-credit {
  font-size: 0.82rem;
  color: rgba(148,163,184,.5);
}

/* ── Back to top ────────────────────────────────────────── */
.back-to-top {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  width: 48px; height: 48px;
  border-radius: 12px;
  background: var(--accent-primary);
  color: #fff;
  display: grid;
  place-items: center;
  box-shadow: 0 4px 16px rgba(14,165,164,.4);
  transition: opacity var(--transition), transform var(--transition), background var(--transition);
  z-index: 50;
}
.back-to-top:hover { background: #0b8f8e; transform: translateY(-2px); }
.back-to-top[hidden] { display: none; }

/* ══════════════════════════════════════════════════════════
   SCROLL REVEAL ANIMATIONS
══════════════════════════════════════════════════════════ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}
.reveal--delay-1 { transition-delay: 0.1s; }
.reveal--delay-2 { transition-delay: 0.2s; }
.reveal--delay-3 { transition-delay: 0.3s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ══════════════════════════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════════════════════════ */

/* 1024px */
@media (max-width: 1100px) {
  .hero-grid-layout {
    grid-template-columns: 1fr 360px;
  }
  .about-grid { grid-template-columns: 1fr 320px; }
  .contact-grid { gap: var(--space-3xl); }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
}

/* 768px */
@media (max-width: 900px) {
  /* Nav */
  .nav-links { display: none; }
  .hamburger { display: flex; }

  /* Hero */
  .hero {
    min-height: auto;
    padding-block: var(--space-3xl);
  }
  .hero-grid-layout {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-content { max-width: 100%; }
  .hero-actions { justify-content: center; }
  .hero-chips { justify-content: center; }
  .hero-sub { margin-inline: auto; }
  .hero-portrait { display: none; } /* Hide portrait on mobile — add it back once you have image */

  /* About */
  .about-grid { grid-template-columns: 1fr; }
  .detail-card { max-width: 480px; }

  /* Contact */
  .contact-grid { grid-template-columns: 1fr; gap: var(--space-2xl); }
  .form-row { grid-template-columns: 1fr; }
  .contact-sub { max-width: 100%; }

  /* Footer */
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-xl); }
  .footer-brand { grid-column: 1 / -1; }
}

/* 480px */
@media (max-width: 600px) {
  .section { padding-block: var(--space-3xl); }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; max-width: 300px; justify-content: center; }

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

  .timeline::before { left: 12px; }
  .timeline-item { padding-left: 40px; }
  .timeline-marker { left: 3px; }
  .timeline-header { flex-direction: column; }

  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom-inner { flex-direction: column; text-align: center; }

  .back-to-top { bottom: var(--space-lg); right: var(--space-lg); }
}

/* 320px */
@media (max-width: 380px) {
  :root { --container-pad: 1rem; }
  .hero-heading { font-size: 1.75rem; }
  .nav-actions .btn-outline { display: none; }
}