/* ============================================================
   SECTIONS.CSS — Per-section styles
   Hero, About, Skills, Projects, Experience, Education,
   Certifications, Testimonials, Open Source, Contact
   ============================================================ */

/* Background ambience (subtle gradient per section) */
.section::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.85;
}

#hero::before {
  background:
    radial-gradient(58% 42% at 12% 20%, var(--accent-light), transparent 72%),
    radial-gradient(52% 38% at 84% 82%, var(--accent-warm-soft), transparent 74%);
}
#about::before        { background: radial-gradient(55% 36% at 84% 18%, var(--accent-light), transparent 74%); }
#skills::before       { background: radial-gradient(50% 38% at 18% 82%, var(--accent-light), transparent 74%); }
#projects::before     { background: radial-gradient(62% 42% at 86% 16%, var(--accent-light), transparent 72%); }
#experience::before   { background: radial-gradient(48% 34% at 10% 20%, var(--accent-light), transparent 76%); }
#education::before    { background: radial-gradient(56% 38% at 88% 78%, var(--accent-light), transparent 74%); }
#certifications::before { background: radial-gradient(50% 36% at 14% 22%, var(--accent-light), transparent 76%); }
#testimonials::before { background: radial-gradient(48% 34% at 16% 20%, var(--accent-light), transparent 76%); }
#opensource::before   { background: radial-gradient(56% 38% at 82% 80%, var(--accent-light), transparent 74%); }
#contact::before      { background: radial-gradient(58% 40% at 14% 24%, var(--accent-light), transparent 74%); }

/* Alternating section backgrounds for rhythm */
#hero, #skills, #experience, #certifications, #testimonials, #contact { background: var(--bg-primary); }
#about, #projects, #education, #opensource { background: var(--bg-secondary); }

/* ═══════════════════════════════════════════════════════════
   HERO
═══════════════════════════════════════════════════════════ */
.section__bg-decoration {
  position: absolute;
  right: clamp(1.5rem, 7vw, 6rem);
  top: clamp(1.5rem, 10vh, 7rem);
  width: min(44vw, 460px);
  aspect-ratio: 1;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(circle at 35% 35%, var(--accent-light), transparent 72%);
  animation: heroFloat 14s ease-in-out infinite;
}
@keyframes heroFloat {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50%      { transform: translate3d(-8px, 10px, 0) scale(1.04); }
}

.hero__status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.4rem 0.85rem;
  background: var(--surface-1);
  border: 1px solid var(--border-light);
  border-radius: 100px;
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  box-shadow: var(--shadow-sm);
}
.hero__status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 3px var(--success-bg);
  animation: statusPulse 2.4s ease-in-out infinite;
}
@keyframes statusPulse {
  0%, 100% { box-shadow: 0 0 0 3px var(--success-bg); }
  50%      { box-shadow: 0 0 0 6px transparent; }
}
.hero__status-label {
  font-weight: 600;
  text-transform: uppercase;
  color: var(--success);
}

.hero__greeting {
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
  font-weight: 500;
}

.hero__name {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 7vw, var(--font-size-5xl));
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.hero__title {
  font-family: var(--font-serif);
  font-size: var(--font-size-2xl);
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  font-style: italic;
  font-weight: 400;
}

.hero__tagline {
  font-family: var(--font-serif);
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  max-width: var(--measure);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-2xl);
}

.hero__cta {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-3xl);
}

.hero__scroll-hint {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 500;
  animation: scrollHintPulse 3s ease-in-out infinite;
}
.hero__scroll-arrow { display: flex; align-items: center; }
@keyframes scrollHintPulse {
  0%, 100% { opacity: 0.6; transform: translateY(0); }
  50%      { opacity: 1;   transform: translateY(5px); }
}

/* ═══════════════════════════════════════════════════════════
   ABOUT
═══════════════════════════════════════════════════════════ */
.about__content { max-width: var(--measure-wide); }

.about__bio p {
  font-family: var(--font-serif);
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  color: var(--text-secondary);
  max-width: var(--measure);
  margin-bottom: var(--space-lg);
}
.about__bio p:last-child { margin-bottom: var(--space-2xl); }

.about__details {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.about__detail {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--surface-1);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius-lg);
  transition: border-color var(--transition-base),
              box-shadow var(--transition-base),
              transform var(--transition-base);
}
.about__detail:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.about__detail-icon {
  width: 36px; height: 36px;
  flex-shrink: 0;
  background: var(--surface-2);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-warm);
  transition: background var(--transition-base), color var(--transition-base);
}
.about__detail:hover .about__detail-icon {
  background: var(--accent);
  color: var(--bg-primary);
}

.about__detail-body {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.about__detail-label {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 600;
}
.about__detail-value {
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  color: var(--text-primary);
}

/* ═══════════════════════════════════════════════════════════
   SKILLS
═══════════════════════════════════════════════════════════ */
.skills__categories {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

.skills__category-title {
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-weight: 600;
}
.skills__category-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border-light);
}

.skills__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.skill-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--surface-1);
  border: 1px solid var(--border-light);
  padding: 0.45rem 0.95rem;
  border-radius: 100px;
  cursor: default;
  transition: border-color var(--transition-fast),
              background var(--transition-fast),
              color var(--transition-fast),
              transform var(--transition-fast),
              box-shadow var(--transition-fast);
}
.skill-tag:hover {
  border-color: var(--accent);
  background: var(--accent-light);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.skill-tag__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-warm);
  flex-shrink: 0;
  opacity: 0.7;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}
.skill-tag:hover .skill-tag__dot {
  opacity: 1;
  transform: scale(1.3);
}

/* ═══════════════════════════════════════════════════════════
   PROJECTS
═══════════════════════════════════════════════════════════ */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: clamp(1.25rem, 2.2vw, var(--space-xl));
}

.project-card {
  position: relative;
  padding: clamp(1.4rem, 2.4vw, var(--space-xl));
  background: var(--surface-1);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  overflow: hidden;
  transition: box-shadow var(--transition-base),
              transform var(--transition-base),
              border-color var(--transition-base);
}

.project-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-warm));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}
.project-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
  border-color: var(--border-strong);
}
.project-card:hover::before { transform: scaleX(1); }

.project-card--featured {
  background: linear-gradient(180deg, var(--surface-1), var(--surface-2));
}
.project-card--featured::before { transform: scaleX(1); }

.project-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  flex-wrap: wrap;
  color: var(--text-muted);
}

.project-card__category {
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--accent-warm);
}

.project-card__featured-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
  white-space: nowrap;
  font-family: var(--font-sans);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-light);
  padding: 0.25rem 0.6rem;
  border-radius: 100px;
  line-height: 1;
}
.project-card__featured-badge > span[aria-hidden="true"] {
  display: inline-block;
  font-size: 0.85em;
  letter-spacing: 0;
}

.project-card__title {
  font-family: var(--font-serif);
  font-size: var(--font-size-xl);
  color: var(--text-primary);
  font-weight: 400;
  letter-spacing: var(--letter-spacing-tight);
  line-height: 1.2;
}

.project-card__desc {
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  flex: 1;
}

.project-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}
.project-card__tech span {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  background: var(--surface-2);
  color: var(--text-secondary);
  padding: 0.25rem 0.6rem;
  border-radius: var(--border-radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.project-card:hover .project-card__tech span {
  background: var(--accent-light);
  color: var(--accent);
}

.project-card__footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-sm);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--border-light);
  margin-top: var(--space-sm);
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0.4rem 0.7rem;
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius-sm);
  transition: color var(--transition-fast),
              background var(--transition-fast),
              border-color var(--transition-fast),
              transform var(--transition-fast);
}
.project-card__link:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-light);
  transform: translateY(-1px);
}

/* ═══════════════════════════════════════════════════════════
   EXPERIENCE — vertical timeline
═══════════════════════════════════════════════════════════ */
.timeline {
  position: relative;
  padding-left: 3rem;
  max-width: 820px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent) 0%, var(--border-light) 100%);
  border-radius: 1px;
}

.timeline__item {
  position: relative;
  margin-bottom: var(--space-3xl);
}
.timeline__item:last-child { margin-bottom: 0; }

.timeline__marker {
  position: absolute;
  left: -2.65rem;
  top: 6px;
  width: 14px;
  height: 14px;
  background: var(--bg-primary);
  border: 2.5px solid var(--accent);
  border-radius: 50%;
  z-index: 2;
  transition: background var(--transition-fast), transform var(--transition-fast);
}
.timeline__item:hover .timeline__marker {
  background: var(--accent);
  transform: scale(1.25);
}

.timeline__content {
  background: var(--surface-1);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius-lg);
  padding: clamp(1.2rem, 2.2vw, var(--space-xl)) clamp(1.35rem, 2.6vw, var(--space-2xl));
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}
.timeline__item:hover .timeline__content {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.timeline__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-lg);
  margin-bottom: 4px;
  flex-wrap: wrap;
}

.timeline__role {
  font-family: var(--font-serif);
  font-size: var(--font-size-xl);
  color: var(--text-primary);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: var(--letter-spacing-tight);
}

.timeline__date {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
  border: 1px solid var(--border-light);
  background: var(--surface-2);
  border-radius: 100px;
  padding: 4px 10px;
}

.timeline__company {
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  color: var(--accent-warm);
  font-style: italic;
  margin-bottom: var(--space-sm);
}

.timeline__desc {
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ═══════════════════════════════════════════════════════════
   EDUCATION
═══════════════════════════════════════════════════════════ */
.education__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.education__card {
  background: var(--surface-1);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl) var(--space-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition-base),
              box-shadow var(--transition-base),
              transform var(--transition-base);
}
.education__card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}
.education__card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}
.education__card:hover::before { transform: scaleX(1); }

.education__icon {
  width: 52px;
  height: 52px;
  background: var(--surface-2);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-warm);
  margin-bottom: var(--space-sm);
  transition: background var(--transition-base), color var(--transition-base);
}
.education__card:hover .education__icon {
  background: var(--accent);
  color: var(--bg-primary);
}

.education__degree {
  font-family: var(--font-serif);
  font-size: var(--font-size-lg);
  color: var(--text-primary);
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: var(--letter-spacing-tight);
}

.education__school {
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  font-style: italic;
}

.education__year {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--text-muted);
  margin-top: auto;
  padding-top: var(--space-sm);
}

.education__note {
  font-family: var(--font-serif);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  line-height: 1.65;
  margin-top: var(--space-xs);
}

/* ═══════════════════════════════════════════════════════════
   CERTIFICATIONS
═══════════════════════════════════════════════════════════ */
.certifications__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.certification__card {
  background: var(--surface-1);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  transition: border-color var(--transition-base),
              box-shadow var(--transition-base),
              transform var(--transition-base);
}
.certification__card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.certification__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-md);
}

.certification__icon {
  width: 48px;
  height: 48px;
  background: var(--surface-2);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-warm);
}

.certification__year {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--text-muted);
  border: 1px solid var(--border-light);
  background: var(--surface-2);
  border-radius: 100px;
  padding: 4px 10px;
  white-space: nowrap;
}

.certification__name {
  font-family: var(--font-serif);
  font-size: var(--font-size-lg);
  color: var(--text-primary);
  line-height: 1.35;
  letter-spacing: var(--letter-spacing-tight);
}

.certification__issuer {
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  font-style: italic;
}

.certification__link {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-warm);
  text-decoration: none;
  transition: color var(--transition-base), transform var(--transition-fast);
}
.certification__link:hover {
  color: var(--accent);
  transform: translateX(2px);
}
.certification__link svg { width: 14px; height: 14px; }

/* ═══════════════════════════════════════════════════════════
   TESTIMONIALS
═══════════════════════════════════════════════════════════ */
.testimonials__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-xl);
}

.testimonial {
  padding: var(--space-2xl);
  background: var(--surface-1);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  position: relative;
  transition: box-shadow var(--transition-base),
              transform var(--transition-base);
}
.testimonial:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}
.testimonial::before {
  content: "\201C";
  position: absolute;
  top: var(--space-md);
  left: var(--space-xl);
  font-size: 5rem;
  line-height: 1;
  color: var(--border);
  font-family: var(--font-serif);
  pointer-events: none;
}

.testimonial__text {
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--text-secondary);
  font-style: italic;
  margin-top: var(--space-xl);
  flex: 1;
}

.testimonial__author {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.testimonial__avatar {
  width: 44px;
  height: 44px;
  background: var(--accent);
  color: var(--bg-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: 600;
  flex-shrink: 0;
  letter-spacing: 0.04em;
}

.testimonial__name {
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  color: var(--text-primary);
  display: block;
  font-style: normal;
}

.testimonial__role {
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  display: block;
  letter-spacing: 0.04em;
}

/* ═══════════════════════════════════════════════════════════
   OPEN SOURCE & WRITING
═══════════════════════════════════════════════════════════ */
.opensource__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 4vw, var(--space-4xl));
  align-items: start;
}

.opensource__subtitle {
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-weight: 600;
}
.opensource__subtitle::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border-light);
}

.opensource__text {
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

/* GitHub stats row */
.opensource__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: var(--space-lg);
  margin: var(--space-xl) 0;
  padding: var(--space-lg);
  background: var(--surface-1);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius-lg);
}

.opensource__stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.opensource__stat-value {
  font-family: var(--font-serif);
  font-size: var(--font-size-2xl);
  color: var(--text-primary);
  font-weight: 400;
  line-height: 1;
  letter-spacing: var(--letter-spacing-tight);
}
.opensource__stat-label {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--text-muted);
}

/* GitHub contribution graph */
.github-graph {
  padding: var(--space-lg);
  background: var(--surface-1);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius-lg);
  overflow-x: auto;
  margin-bottom: var(--space-md);
}

.github-grid {
  display: flex;
  gap: 3px;
}
.github-col {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.github-cell {
  width: 11px;
  height: 11px;
  border-radius: 2px;
  background: var(--github-cell-empty);
  transition: transform 120ms ease;
}
.github-cell:hover { transform: scale(1.4); }
.github-cell[data-level="1"] { background: var(--github-cell-1); }
.github-cell[data-level="2"] { background: var(--github-cell-2); }
.github-cell[data-level="3"] { background: var(--github-cell-3); }
.github-cell[data-level="4"] { background: var(--github-cell-4); }

/* Blog teasers */
.blog-teaser__list {
  display: flex;
  flex-direction: column;
  margin-bottom: var(--space-xl);
}

.blog-teaser__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border-light);
  text-decoration: none;
  color: inherit;
  transition: padding-left var(--transition-fast),
              border-color var(--transition-fast);
}
.blog-teaser__item:last-child { border-bottom: none; }
.blog-teaser__item:hover {
  padding-left: 8px;
  border-bottom-color: var(--accent);
}

.blog-teaser__meta {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--text-muted);
}

.blog-teaser__title {
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  color: var(--text-primary);
  line-height: 1.35;
  transition: color var(--transition-fast);
}
.blog-teaser__item:hover .blog-teaser__title { color: var(--accent); }

/* ═══════════════════════════════════════════════════════════
   CONTACT
═══════════════════════════════════════════════════════════ */
.contact__intro {
  font-family: var(--font-serif);
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  max-width: var(--measure);
  margin-bottom: var(--space-2xl);
}

.contact__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(2rem, 4vw, var(--space-4xl));
  align-items: start;
}

.contact__form {
  padding: var(--space-2xl);
  background: var(--surface-1);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
}

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

.contact__method {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--surface-1);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius-lg);
  transition: border-color var(--transition-base),
              box-shadow var(--transition-base),
              transform var(--transition-base);
}
.contact__method:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.contact__method-icon {
  width: 44px;
  height: 44px;
  background: var(--surface-2);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--accent-warm);
  transition: background var(--transition-base), color var(--transition-base);
}
.contact__method:hover .contact__method-icon {
  background: var(--accent);
  color: var(--bg-primary);
}

.contact__method-body { min-width: 0; flex: 1; }
.contact__method-body h4 {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 4px;
  font-weight: 600;
}
.contact__method-body a {
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  color: var(--text-primary);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: color var(--transition-fast), border-color var(--transition-fast);
  word-break: break-word;
}
.contact__method-body a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* Social links */
.contact__socials {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.contact__social {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--surface-1);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius);
  color: var(--text-secondary);
  text-decoration: none;
  transition: background var(--transition-fast),
              border-color var(--transition-fast),
              color var(--transition-fast),
              transform var(--transition-fast),
              box-shadow var(--transition-fast);
}
.contact__social:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg-primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════════════════════ */
@media (max-width: 1000px) {
  .opensource__grid { grid-template-columns: 1fr; gap: var(--space-3xl); }
}

@media (max-width: 900px) {
  .contact__grid { grid-template-columns: 1fr; gap: var(--space-2xl); }
}

@media (max-width: 600px) {
  .section::before,
  .section__bg-decoration { opacity: 0.55; }

  .projects__grid,
  .education__grid,
  .certifications__grid,
  .testimonials__grid { grid-template-columns: 1fr; }
  .timeline { padding-left: 2.25rem; }
  .hero__name { font-size: var(--font-size-4xl); }
  .contact__method, .contact__form { padding: var(--space-md); }
  .testimonial { padding: var(--space-lg); }
  .testimonial::before { left: var(--space-md); top: var(--space-sm); font-size: 4rem; }
  .education__card { padding: var(--space-lg); }
}