/* ============================================================
   Carlos Carvalhal — Portfolio
   Dark blue palette · Space Grotesk + Space Mono
   ============================================================ */

/* ── Variables ─────────────────────────────────────────────── */
:root {
  --bg:          #04080F;
  --bg-2:        #080F1C;
  --bg-3:        #0C1628;
  --bg-card:     #0A1422;
  --accent:      #1A6BFF;
  --accent-mid:  #4A90FF;
  --accent-glow: #00AAFF;
  --accent-pale: rgba(26, 107, 255, 0.12);
  --border:      rgba(26, 107, 255, 0.18);
  --border-soft: rgba(255, 255, 255, 0.06);
  --text:        #EEF2FF;
  --text-muted:  #7A8BAA;
  --text-dim:    #3D4F6A;

  --font:  'Space Grotesk', sans-serif;
  --mono:  'Space Mono', monospace;

  --pad:   clamp(80px, 10vw, 130px);
  --cmax:  1120px;
  --r:     8px;
}

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

/* ── Utilities ─────────────────────────────────────────────── */
.container {
  max-width: var(--cmax);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px);
}

.section-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-mid);
  margin-bottom: 40px;
}

.section-heading {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 64px;
  letter-spacing: -0.02em;
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Navigation ────────────────────────────────────────────── */
#nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px clamp(20px, 4vw, 48px);
  transition: padding 0.3s, background 0.3s, border-color 0.3s;
  border-bottom: 1px solid transparent;
}
#nav.scrolled {
  padding-top: 16px;
  padding-bottom: 16px;
  background: rgba(4, 8, 15, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--border);
}

.nav-logo {
  font-family: var(--mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--accent-mid);
  letter-spacing: 0.08em;
  text-decoration: none;
  cursor: default;
}

.nav-links {
  display: flex;
  gap: 40px;
  list-style: none;
}
.nav-links a {
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-muted);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s, background 0.25s;
}
/* Hamburger → X when open */
.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background: var(--text);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  background: var(--text);
}

/* ── Hero ──────────────────────────────────────────────────── */
#hero {
  position: relative;
  height: 100svh;
  min-height: 500px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

#particle-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* Radial gradient fade at bottom */
#hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 100%, rgba(4,8,15,0.9) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 80px clamp(20px, 4vw, 48px) 120px;
  max-width: var(--cmax);
  margin: 0 auto;
  width: 100%;
}

.hero-eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-mid);
  margin-bottom: 24px;
  opacity: 0;
  animation: heroFade 0.8s 0.3s forwards;
}

.hero-name {
  font-size: clamp(4rem, 10vw, 9rem);
  font-weight: 700;
  line-height: 0.92;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 32px;
  opacity: 0;
  animation: heroFade 0.8s 0.5s forwards;
}

.hero-sub {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-muted);
  max-width: min(460px, 100%);
  margin-bottom: 52px;
  min-height: 2em;
  opacity: 0;
  animation: heroFade 0.8s 0.7s forwards;
}

.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  opacity: 0;
  animation: heroFade 0.8s 0.9s forwards;
}

.btn-primary {
  display: inline-block;
  padding: 13px 30px;
  background: var(--accent);
  color: #fff;
  border-radius: 5px;
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.04em;
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
}
.btn-primary:hover {
  background: var(--accent-glow);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(26, 107, 255, 0.4);
}

.btn-ghost {
  display: inline-block;
  padding: 13px 30px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 5px;
  text-decoration: none;
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.04em;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.btn-ghost:hover {
  border-color: var(--accent-mid);
  color: var(--text);
  background: var(--accent-pale);
}

.hero-scroll-hint {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  opacity: 0;
  animation: heroFade 1s 1.3s forwards;
}
.hero-scroll-hint span {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.scroll-bar {
  width: 1px;
  height: 52px;
  background: linear-gradient(to bottom, var(--accent-mid), transparent);
  animation: scrollPulse 2.2s ease-in-out infinite;
}

/* ── About ─────────────────────────────────────────────────── */
#about {
  padding: var(--pad) 0;
  background: var(--bg-2);
  position: relative;
}
#about::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--accent), transparent);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 80px;
  align-items: start;
}

.about-text h2 {
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text);
  margin-bottom: 28px;
  letter-spacing: -0.01em;
}
.about-text p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 18px;
}
.about-text p:last-child { margin-bottom: 0; }

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

.stat-card {
  padding: 28px 24px;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--r);
  transition: border-color 0.25s, box-shadow 0.25s;
}
.stat-card:hover {
  border-color: rgba(26, 107, 255, 0.45);
  box-shadow: 0 0 28px rgba(26, 107, 255, 0.08);
}

.stat-num {
  font-family: var(--mono);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--accent-glow);
  line-height: 1;
  margin-bottom: 10px;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

/* ── Experience / Timeline ─────────────────────────────────── */
#experience {
  padding: var(--pad) 0;
}

.timeline {
  position: relative;
  padding-left: 0;
}

/* Vertical line — sits at left: 0, dot center is at 5.5px which overlaps it */
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent-mid) 0%, var(--border) 70%, transparent 100%);
}

.tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 32px;
  padding-left: 36px;
  padding-bottom: 60px;
}
.tl-item:last-child { padding-bottom: 0; }

/* Dot: left:0 places its left edge at item's left edge (same as timeline left).
   Dot is 11px wide so it straddles the line perfectly. */
.tl-dot {
  position: absolute;
  left: 0;
  top: 10px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 14px var(--accent);
  border: 2px solid var(--bg);
  transform: translateX(-50%);
}
.tl-dot--dim {
  background: var(--text-dim);
  box-shadow: none;
}

.tl-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 4px;
}
.tl-year {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent-mid);
  letter-spacing: 0.08em;
  white-space: nowrap;
}
.tl-loc {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-dim);
  letter-spacing: 0.06em;
}

.tl-body {}

.tl-company {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 5px;
}
.tl-role {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--accent-mid);
  margin-bottom: 16px;
  line-height: 1.5;
}
.tl-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.75;
  max-width: 580px;
  margin-bottom: 20px;
}
.tl-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.tl-chips span {
  font-size: 12px;
  padding: 4px 13px;
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text-muted);
}

/* ── Skills ────────────────────────────────────────────────── */
#skills {
  padding: var(--pad) 0;
  background: var(--bg-2);
  position: relative;
}
#skills::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border), transparent);
}

.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.skill-group {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  transition: border-color 0.25s, box-shadow 0.25s;
}
.skill-group:hover {
  border-color: rgba(26, 107, 255, 0.35);
  box-shadow: 0 4px 32px rgba(26, 107, 255, 0.06);
}

.sg-title {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-mid);
  margin-bottom: 20px;
}

.sg-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.sg-tags span {
  font-size: 13px;
  padding: 6px 14px;
  background: rgba(26, 107, 255, 0.07);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--text-muted);
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  cursor: default;
}
.sg-tags span:hover {
  background: rgba(26, 107, 255, 0.16);
  color: var(--text);
  border-color: rgba(74, 144, 255, 0.45);
}

/* ── Work / Projects ───────────────────────────────────────── */
#work {
  padding: var(--pad) 0;
}

.work-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.work-card {
  padding: 32px;
  background: var(--bg-2);
  border: 1px solid var(--border-soft);
  border-radius: var(--r);
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}
.work-card:hover {
  border-color: rgba(26, 107, 255, 0.4);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(26, 107, 255, 0.1);
}

.wc-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
}
.wc-year {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-dim);
  letter-spacing: 0.06em;
  white-space: nowrap;
}
.wc-tag {
  font-size: 10px;
  padding: 3px 10px;
  background: rgba(26, 107, 255, 0.1);
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--accent-mid);
  letter-spacing: 0.05em;
  white-space: nowrap;
}
.wc-tag--research {
  background: rgba(0, 200, 150, 0.08);
  border-color: rgba(0, 200, 150, 0.2);
  color: #4ECFAA;
}

.work-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.35;
}
.work-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.75;
  flex: 1;
}
.wc-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: auto;
}
.wc-stack span {
  font-size: 11px;
  padding: 3px 10px;
  border: 1px solid var(--border-soft);
  border-radius: 4px;
  color: var(--text-dim);
  letter-spacing: 0.03em;
}

/* ── Background / Learning ─────────────────────────────────── */
#background {
  padding: var(--pad) 0;
  background: var(--bg-2);
  position: relative;
}
#background::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border), transparent);
}

/* Formal degrees — 2 column */
.bg-degrees {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 56px;
}

/* Certifications subsection */
.certs-section {}

.certs-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 24px;
}
.certs-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.certs-count {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.08em;
}

.certs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

/* Standard cert card */
.cert-card {
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color 0.25s;
  position: relative;
}
.cert-card:hover { border-color: rgba(26, 107, 255, 0.4); }

/* First card "Latest" highlight */
.cert-card--latest {
  border-color: rgba(26, 107, 255, 0.4);
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(26, 107, 255, 0.05) 100%);
}

.cert-latest-badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-glow);
  border: 1px solid rgba(0, 170, 255, 0.35);
  border-radius: 100px;
  padding: 3px 10px;
  margin-bottom: 4px;
  width: fit-content;
}

.cert-issuer {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  text-transform: uppercase;
}
.cert-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}
.cert-date {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-muted);
  margin-top: auto;
  padding-top: 8px;
}

/* "More" card */
.cert-card--more {
  align-items: center;
  justify-content: center;
  text-align: center;
  border-style: dashed;
  border-color: var(--border-soft);
  background: transparent;
}
.cert-card--more:hover { border-color: var(--border); }

.cert-more-num {
  font-family: var(--mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-dim);
  line-height: 1;
}
.cert-more-label {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 16px;
}
.cert-more-link {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent-mid);
  text-decoration: none;
  letter-spacing: 0.06em;
  transition: color 0.2s;
}
.cert-more-link:hover { color: var(--accent-glow); }

/* Certificate link inside main-page cert cards */
.cert-cert-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-muted);
  text-decoration: none;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
  transition: color 0.2s;
}
.cert-cert-link:hover { color: var(--accent-glow); }

/* Shared edu-card used for degrees */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.edu-card {
  padding: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  transition: border-color 0.25s;
}
.edu-card:hover { border-color: rgba(26, 107, 255, 0.4); }

.edu-year {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent-mid);
  letter-spacing: 0.1em;
  margin-bottom: 20px;
}
.edu-school {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}
.edu-degree {
  font-size: 0.9rem;
  color: var(--accent-mid);
  margin-bottom: 12px;
  font-weight: 500;
}
.edu-detail {
  font-size: 0.83rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ── Posts ─────────────────────────────────────────────────── */
#posts {
  padding: var(--pad) 0;
}

/* Empty state */
.posts-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 12px;
  padding: 80px 32px;
  border: 1px dashed var(--border-soft);
  border-radius: var(--r);
  max-width: 520px;
  margin: 0 auto;
}
.posts-empty-icon {
  font-size: 1.6rem;
  color: var(--text-dim);
  margin-bottom: 8px;
}
.posts-empty-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-muted);
}
.posts-empty-sub {
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.6;
  max-width: 360px;
  margin-bottom: 8px;
}

/* Posts grid (for when posts exist) */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.post-card {
  padding: 32px;
  background: var(--bg-2);
  border: 1px solid var(--border-soft);
  border-radius: var(--r);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}
.post-card:hover {
  border-color: rgba(26, 107, 255, 0.4);
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(26, 107, 255, 0.08);
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}
.post-date {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-dim);
  letter-spacing: 0.08em;
}
.post-tag {
  font-size: 10px;
  padding: 2px 9px;
  background: rgba(26, 107, 255, 0.08);
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--accent-mid);
  letter-spacing: 0.05em;
}

.post-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.35;
}
.post-excerpt {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
  flex: 1;
}
.post-link {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent-mid);
  text-decoration: none;
  letter-spacing: 0.06em;
  transition: color 0.2s;
  margin-top: auto;
}
.post-link:hover { color: var(--accent-glow); }

/* Latest post — accent border, matches cert-card--latest */
.post-card--latest {
  border-color: color-mix(in srgb, var(--accent) 35%, transparent);
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--accent) 6%, var(--surface)) 0%,
    var(--surface) 60%
  );
  position: relative;
}
.post-latest-badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-glow);
  border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  border-radius: 100px;
  padding: 2px 8px;
  margin-bottom: 4px;
}

/* "View all posts" card — dashed, mirrors cert-card--more */
.post-card--more {
  border-style: dashed;
  border-color: var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 6px;
  min-height: 140px;
}
.post-card--more:hover { border-color: color-mix(in srgb, var(--accent) 40%, transparent); }
.post-more-num {
  font-family: var(--mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-dim);
}
.post-more-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 16px;
}
.post-more-link {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent-mid);
  text-decoration: none;
  letter-spacing: 0.06em;
  transition: color 0.2s;
}
.post-more-link:hover { color: var(--accent-glow); }

/* ── Posts page ─────────────────────────────────────────────── */
.posts-page-list { padding: 0 0 96px; }

.post-page-entry {
  padding: 48px 0;
  border-bottom: 1px solid var(--border);
}
.post-page-entry:last-child { border-bottom: none; }

.post-page-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}
.post-page-title {
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  font-weight: 700;
  color: var(--text);
  line-height: 1.25;
  margin-bottom: 10px;
}
.post-page-excerpt {
  font-size: 0.93rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 640px;
  margin-bottom: 28px;
}

/* Twitter embed container */
.post-tweet-embed {
  max-width: 550px;
}
.post-tweet-embed .twitter-tweet {
  margin: 0 !important;
}

/* External link card — rendered for non-tweet posts */
.post-link-card {
  display: flex;
  align-items: center;
  gap: 20px;
  max-width: 540px;
  padding: 20px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  transition: border-color 0.25s, transform 0.2s;
}
.post-link-card:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  transform: translateY(-2px);
}
.post-link-card-body { flex: 1; min-width: 0; }
.post-link-card-domain {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--accent-mid);
  text-transform: lowercase;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.post-link-card-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.post-link-card-arrow {
  font-family: var(--mono);
  font-size: 1.1rem;
  color: var(--accent-mid);
  flex-shrink: 0;
  transition: transform 0.2s;
}
.post-link-card:hover .post-link-card-arrow { transform: translateX(3px); }

/* ── Contact ───────────────────────────────────────────────── */
#contact {
  padding: var(--pad) 0;
  position: relative;
  overflow: hidden;
}

/* Big glowing orb behind contact */
#contact::before {
  content: '';
  position: absolute;
  bottom: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(26,107,255,0.1) 0%, transparent 70%);
  pointer-events: none;
}

.contact-inner {
  text-align: center;
  max-width: 560px;
  margin: 0 auto;
}

.contact-heading {
  font-size: clamp(3rem, 7vw, 6rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--text) 30%, var(--accent-glow) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.contact-sub {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 52px;
}

.contact-links {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.contact-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border: 1px solid var(--border);
  border-radius: 6px;
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.04em;
  transition: all 0.22s;
}
.contact-btn:hover {
  border-color: var(--accent-mid);
  color: var(--text);
  background: var(--accent-pale);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(26, 107, 255, 0.15);
}
.contact-btn svg { width: 18px; height: 18px; flex-shrink: 0; }

/* ── Footer ────────────────────────────────────────────────── */
footer {
  padding: 28px 0;
  border-top: 1px solid var(--border-soft);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
footer span {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}
.footer-konami {
  opacity: 0.25;
  transition: opacity 0.3s;
  user-select: none;
  cursor: default;
}
.footer-konami:hover { opacity: 0.5; }
.footer-konami.active {
  opacity: 1;
  color: var(--accent-glow);
  animation: konami-flash 0.5s ease;
}

/* ── Konami overlay ────────────────────────────────────────── */
#konami-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(4, 8, 15, 0.95);
  backdrop-filter: blur(12px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s;
  text-align: center;
  padding: 32px;
}
#konami-overlay.show {
  opacity: 1;
  pointer-events: all;
}
#konami-overlay h3 {
  font-family: var(--mono);
  font-size: clamp(1.2rem, 3vw, 2rem);
  color: var(--accent-glow);
  margin-bottom: 16px;
  letter-spacing: 0.1em;
}
#konami-overlay p {
  color: var(--text-muted);
  max-width: 480px;
  line-height: 1.7;
  margin-bottom: 32px;
}
#konami-overlay button {
  padding: 12px 28px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 5px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: background 0.2s;
}
#konami-overlay button:hover { background: var(--accent-glow); }

/* ── Keyframes ─────────────────────────────────────────────── */
@keyframes heroFade {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.9); }
  50%       { opacity: 1;   transform: scaleY(1.1); }
}
@keyframes konami-flash {
  0%, 100% { color: var(--accent-glow); }
  50%       { color: var(--text); }
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 900px) {
  .about-grid     { grid-template-columns: 1fr; gap: 56px; }
  .edu-grid       { grid-template-columns: 1fr 1fr; }
  .bg-degrees     { grid-template-columns: 1fr; }
  .certs-grid     { grid-template-columns: 1fr 1fr; }
  .skills-grid    { grid-template-columns: 1fr; }
  .posts-grid     { grid-template-columns: 1fr; }
  .tl-item        { grid-template-columns: 1fr; gap: 8px; }
  .tl-meta        { flex-direction: row; gap: 16px; align-items: center; }
}

@media (max-width: 640px) {
  :root { --pad: 72px; }

  .nav-links   { display: none; flex-direction: column; }
  .nav-toggle  { display: flex; }
  .nav-links.open {
    display: flex;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: rgba(4, 8, 15, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 24px clamp(20px, 4vw, 48px) 32px;
    gap: 22px;
    border-bottom: 1px solid var(--border);
  }

  /* Hero */
  #hero         { min-height: 100svh; }
  .hero-name    { font-size: clamp(2.8rem, 13vw, 5rem); }
  .hero-content { padding-bottom: 100px; }
  .hero-cta     { flex-direction: column; align-items: flex-start; gap: 12px; }
  .btn-primary,
  .btn-ghost    { width: 100%; text-align: center; box-sizing: border-box; }

  /* Stats */
  .about-stats  { grid-template-columns: 1fr 1fr; }
  .stat-num     { font-size: 2.2rem; }

  /* Background */
  .edu-grid     { grid-template-columns: 1fr; }
  .bg-degrees   { grid-template-columns: 1fr; }
  .certs-grid   { grid-template-columns: 1fr; }

  /* Timeline padding adjustment on small screens */
  .tl-item      { padding-left: 28px; padding-bottom: 48px; }

  /* Footer */
  .footer-inner { flex-direction: column; gap: 10px; text-align: center; }

  /* Contact */
  .contact-links  { flex-direction: column; align-items: center; }
  .contact-btn    { width: 100%; max-width: 280px; justify-content: center; }
  .contact-heading { font-size: clamp(2.4rem, 11vw, 4rem); }
}

/* Very small screens — 320px phones */
@media (max-width: 380px) {
  .hero-name  { font-size: clamp(2.4rem, 12vw, 3.5rem); }
  .stat-num   { font-size: 1.9rem; }
  .stat-card  { padding: 20px 16px; }
  .tl-item    { padding-left: 24px; }
}

/* ── COURSES PAGE ──────────────────────────────────────────── */

.courses-hero {
  padding: calc(var(--nav-h) + 72px) 0 56px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  text-decoration: none;
  letter-spacing: 0.04em;
  margin-bottom: 28px;
  transition: color 0.2s;
}
.back-link:hover { color: var(--accent-glow); }

.courses-heading {
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  margin: 12px 0 16px;
}

.courses-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 480px;
}

/* Year groups */
.courses-list { padding: 0 0 96px; }

.course-year-group { margin-bottom: 64px; }

.course-year-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.course-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

/* Individual course card */
.course-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color 0.25s, transform 0.25s;
}
.course-card:hover {
  border-color: color-mix(in srgb, var(--accent) 40%, transparent);
  transform: translateY(-2px);
}

.course-platform {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--accent);
  text-transform: uppercase;
}

.course-name {
  font-size: 0.97rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
  flex: 1;
}

.course-date {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.course-cert-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-decoration: none;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  transition: color 0.2s;
}
.course-cert-link:hover { color: var(--accent-glow); }
.course-cert-link svg {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
}

/* Courses page responsive */
@media (max-width: 640px) {
  .course-cards-grid { grid-template-columns: 1fr; }
  .courses-heading   { font-size: clamp(2rem, 10vw, 3rem); }
}