/* ============================================================
   RAED AL TABANJEH — PORTFOLIO
   Theme: Industrial Intelligence / Dark Technical
   Fonts: Syne (display) + IBM Plex Mono (code/accent) + Lora (body)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;500;600;700;800&family=IBM+Plex+Mono:wght@300;400;500&family=Lora:ital,wght@0,400;0,500;1,400&display=swap');

/* ── CSS VARIABLES ──────────────────────────────────────── */
:root {
  --bg:           #0a0b0d;
  --bg-2:         #0f1114;
  --bg-3:         #15181d;
  --surface:      #1a1e25;
  --surface-2:    #212630;
  --border:       #252b35;
  --border-2:     #2e3540;
  --text:         #e8eaf0;
  --text-2:       #9aa3b2;
  --text-3:       #5a6478;
  --accent:       #00d4ff;
  --accent-dim:   #00d4ff22;
  --accent-2:     #ff6b35;
  --accent-3:     #7fff6b;
  --accent-4:     #c084fc;
  --gold:         #f5c842;
  --font-display: 'Syne', sans-serif;
  --font-mono:    'IBM Plex Mono', monospace;
  --font-body:    'Lora', Georgia, serif;
  --radius:       4px;
  --radius-lg:    8px;
  --transition:   0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --glow:         0 0 20px rgba(0, 212, 255, 0.15);
  --glow-strong:  0 0 40px rgba(0, 212, 255, 0.25);
}

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

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--accent); color: var(--bg); }

/* ── GRID NOISE OVERLAY ──────────────────────────────────── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,212,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.02) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 1;
}

/* ── TYPOGRAPHY ─────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

h1 { font-size: clamp(2.4rem, 6vw, 5rem); }
h2 { font-size: clamp(1.6rem, 4vw, 2.8rem); }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.5rem); }
h4 { font-size: 1rem; font-weight: 600; }

p { color: var(--text-2); }

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

code, .mono {
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--accent);
}

/* ── LAYOUT ─────────────────────────────────────────────── */
.container {
  max-width: 1720px;
  width: 100%;
  margin: 0 auto;
  padding: 0 clamp(1rem, 3.8vw, 3.5rem);
}

.container--narrow {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
}

main,
footer,
section {
  position: relative;
  z-index: 2;
}

.home-philosophy-grid,
.home-insights-grid,
.about-philosophy-grid,
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.home-philosophy-grid {
  align-items: center;
  gap: 3rem;
}

.about-philosophy-grid,
.contact-grid {
  align-items: start;
}

/* ── NAV ─────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 1.25rem 0;
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}

.nav.scrolled {
  background: rgba(10, 11, 13, 0.92);
  backdrop-filter: blur(16px);
  border-bottom-color: var(--border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.nav__logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--text);
  letter-spacing: -0.03em;
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.nav__logo-mark {
  width: 30px;
  height: 30px;
  border-radius: 6px;
  border: 1px solid rgba(0, 212, 255, 0.24);
  background: linear-gradient(145deg, rgba(0, 212, 255, 0.1), rgba(10, 11, 13, 0.2));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 24px rgba(0, 212, 255, 0.12);
  overflow: hidden;
}

.nav__logo-mark img {
  width: 74%;
  height: 74%;
  object-fit: contain;
  display: block;
}

.nav__logo-text {
  white-space: nowrap;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.nav__link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-3);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius);
  transition: all var(--transition);
  border: 1px solid transparent;
}

.nav__link--cta {
  color: var(--text-2);
  border-color: var(--border-2);
}

.nav__link:hover,
.nav__link.active {
  color: var(--accent);
  background: var(--accent-dim);
  border-color: rgba(0, 212, 255, 0.2);
}

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

.nav__menu-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.nav__menu-btn span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text-2);
  transition: all var(--transition);
}

.nav__menu-btn[aria-expanded="true"] span:nth-child(2) {
  transform: translateY(7px) rotate(45deg);
}

.nav__menu-btn[aria-expanded="true"] span:nth-child(3) {
  opacity: 0;
}

.nav__menu-btn[aria-expanded="true"] span:nth-child(4) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── HERO ────────────────────────────────────────────────── */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: 8rem 0 5rem;
  position: relative;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 800px 600px at 70% 40%, rgba(0,212,255,0.05) 0%, transparent 70%),
    radial-gradient(ellipse 400px 400px at 20% 80%, rgba(255,107,53,0.04) 0%, transparent 60%);
}

.hero__brand-mark {
  position: absolute;
  right: clamp(1rem, 5vw, 3rem);
  top: 53%;
  transform: translateY(-50%);
  width: min(34vw, 450px);
  opacity: 0.2;
  filter: drop-shadow(0 0 32px rgba(0, 212, 255, 0.16));
  pointer-events: none;
  z-index: 0;
}

.hero__brand-mark img {
  width: 100%;
  height: auto;
  display: block;
}

.hero__content { position: relative; z-index: 1; }

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 1.5rem;
}

.hero__eyebrow::before {
  content: '';
  display: block;
  width: 2rem; height: 1px;
  background: var(--accent);
}

.hero__name {
  font-size: clamp(3rem, 8vw, 6.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.0;
  margin-bottom: 0.5rem;
}

.hero__name-accent { color: var(--accent); }

.hero__title {
  font-family: var(--font-mono);
  font-size: clamp(0.85rem, 2vw, 1.1rem);
  color: var(--text-3);
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero__title-sep { color: var(--border-2); }

.hero__bio {
  max-width: 580px;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-2);
  margin-bottom: 2.5rem;
}

.hero__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero__stats {
  margin-top: 5rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  max-width: 480px;
}

.hero__stat {
  background: var(--bg-2);
  padding: 1.5rem;
  text-align: center;
}

.hero__stat-num {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}

.hero__stat-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 0.25rem;
}

/* ── BUTTONS ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid transparent;
  text-decoration: none;
}

.btn--primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}
.btn--primary:hover {
  background: transparent;
  color: var(--accent);
  box-shadow: var(--glow);
}

.btn--outline {
  background: transparent;
  color: var(--text-2);
  border-color: var(--border-2);
}
.btn--outline:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-dim);
}

.btn--ghost {
  background: transparent;
  color: var(--text-3);
  border-color: transparent;
  padding: 0.75rem 0;
}
.btn--ghost:hover { color: var(--accent); }

/* ── SECTION HEADERS ─────────────────────────────────────── */
.section-header {
  margin-bottom: 3rem;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  margin-bottom: 0.75rem;
}

.section-label::before {
  content: '';
  display: block;
  width: 1.5rem; height: 1px;
  background: var(--accent);
}

.section-title { color: var(--text); }

.section-sub {
  margin-top: 0.75rem;
  max-width: 560px;
}

/* ── CARDS ───────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.card:hover {
  border-color: var(--border-2);
  background: var(--surface-2);
  transform: translateY(-2px);
  box-shadow: var(--glow);
}

.card:hover::before { opacity: 1; }

.card__tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.25rem 0.6rem;
  border-radius: 2px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}

.card__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.card__body { font-size: 0.9rem; line-height: 1.7; }

.card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

/* ── TECH TAGS ───────────────────────────────────────────── */
.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tech-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-3);
  background: var(--bg-3);
  border: 1px solid var(--border);
  padding: 0.2rem 0.55rem;
  border-radius: 2px;
}

/* ── PROJECT GRID ────────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}

/* ── IDEAS LAB ───────────────────────────────────────────── */
.ideas-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

.idea-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: all var(--transition);
  cursor: pointer;
}

.idea-card:hover {
  border-color: rgba(127, 255, 107, 0.3);
  box-shadow: 0 0 20px rgba(127, 255, 107, 0.06);
  transform: translateY(-2px);
}

.idea-status {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}

.idea-status--thinking  { color: var(--accent); }
.idea-status--researching { color: var(--gold); }
.idea-status--building  { color: var(--accent-3); }
.idea-status--parked    { color: var(--text-3); }

.idea-status .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.importance-bar {
  margin-top: 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-3);
}

.importance-track {
  flex: 1;
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.importance-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-3), var(--accent));
  border-radius: 2px;
}

/* ── CATEGORY FILTERS ────────────────────────────────────── */
.filter-bar {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.filter-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-3);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.filter-btn:hover,
.filter-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

/* ── ARTICLE CARDS ───────────────────────────────────────── */
.article-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  transition: all var(--transition);
}

.article-card:hover .article-card__title { color: var(--accent); }

.article-card__num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-3);
  padding-top: 0.3rem;
}

.article-card__title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
  transition: color var(--transition);
}

.article-card__meta {
  display: flex;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-3);
  margin-bottom: 0.6rem;
}

/* ── PHILOSOPHY PILLARS ──────────────────────────────────── */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.pillar {
  background: var(--bg-2);
  padding: 2rem;
  transition: background var(--transition);
}

.pillar:hover { background: var(--surface); }

.pillar-link {
  display: block;
  text-decoration: none;
  color: inherit;
  height: 100%;
}

.pillar__icon {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.pillar__title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.pillar__text {
  font-size: 0.85rem;
  color: var(--text-3);
  line-height: 1.6;
}

/* ── TERMINAL BLOCK ──────────────────────────────────────── */
.terminal {
  background: var(--bg-3);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-lg);
  overflow: hidden;
  font-family: var(--font-mono);
}

.terminal__header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.terminal__dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}

.terminal__dot--red   { background: #ff5f57; }
.terminal__dot--yellow{ background: #ffbd2e; }
.terminal__dot--green { background: #28c840; }

.terminal__title {
  font-size: 0.72rem;
  color: var(--text-3);
  margin-left: 0.5rem;
}

.terminal__body {
  padding: 1.5rem;
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--text-2);
}

.terminal__body .cmd { color: var(--accent); }
.terminal__body .out { color: var(--accent-3); }
.terminal__body .comment { color: var(--text-3); }

/* ── KNOWLEDGE GRAPH VISUAL ──────────────────────────────── */
.kg-visual {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  padding: 2rem;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  position: relative;
}

.kg-node {
  background: var(--surface);
  border: 1px solid var(--border-2);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-2);
  transition: all var(--transition);
}

.kg-node:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

.kg-node--center {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

/* ── CONTACT ─────────────────────────────────────────────── */
.contact-links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1.25rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  text-decoration: none;
}

.contact-link:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
  transform: translateX(4px);
}

.contact-link__icon {
  width: 40px; height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-3);
  border-radius: var(--radius);
  font-size: 1.1rem;
}

.contact-link__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.contact-link__value {
  font-size: 0.95rem;
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 600;
}

/* ── FOOTER ──────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
  margin-top: 6rem;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer__copy {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-3);
}

.footer__links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.footer__links a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-3);
}
.footer__links a:hover { color: var(--accent); }

/* ── ABOUT PAGE ──────────────────────────────────────────── */
.about-hero {
  padding: 10rem 0 5rem;
}

.skills-matrix {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}

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

.skill-group__title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

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

.skill-list li {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-2);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-list li::before {
  content: '›';
  color: var(--accent);
  font-size: 1rem;
}

/* ── PAGE HERO ───────────────────────────────────────────── */
.page-hero {
  padding: 9rem 0 4rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 4rem;
}

/* ── PROJECT DETAIL ──────────────────────────────────────── */
.project-detail {
  padding-top: 9rem;
  padding-bottom: 4rem;
}

.project-detail__body {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 5rem;
  align-items: start;
}

.project-detail__main {
  min-width: 0;
}

.project-detail__sidebar {
  position: sticky;
  top: 7rem;
}

.project-sidebar-block {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.project-section-heading {
  font-size: 1.1rem;
  color: var(--text-2);
  font-weight: 600;
  font-family: var(--font-mono);
  margin-bottom: 0.75rem;
}

.project-section-text {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-2);
}

.project-meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 3rem;
}

.project-meta-item {
  background: var(--bg-2);
  padding: 1.5rem;
}

.project-meta-item__label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.4rem;
}

.project-meta-item__value {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.arch-diagram {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-2);
  white-space: pre;
  overflow-x: auto;
  line-height: 1.6;
}

.project-demos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.project-demo-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1rem;
}

.project-demo-media {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-3);
  margin-bottom: 0.9rem;
}

.project-demo-media img,
.project-demo-media video {
  width: 100%;
  display: block;
  border-radius: var(--radius);
}

/* ── ANIMATIONS ──────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.fade-up {
  animation: fadeUp 0.6s ease forwards;
}

.fade-up--1 { animation-delay: 0.1s; opacity: 0; }
.fade-up--2 { animation-delay: 0.2s; opacity: 0; }
.fade-up--3 { animation-delay: 0.35s; opacity: 0; }
.fade-up--4 { animation-delay: 0.5s; opacity: 0; }

/* ── UTILITY ─────────────────────────────────────────────── */
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-6 { margin-top: 3rem; }
.mt-8 { margin-top: 4rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-6 { margin-bottom: 3rem; }
.mb-8 { margin-bottom: 4rem; }

.text-accent  { color: var(--accent); }
.text-accent2 { color: var(--accent-2); }
.text-accent3 { color: var(--accent-3); }
.text-muted   { color: var(--text-3); }
.text-mono    { font-family: var(--font-mono); }
.text-sm      { font-size: 0.875rem; }
.text-xs      { font-size: 0.78rem; }

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 3rem 0;
}

.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;
}

/* ── RESPONSIVE ──────────────────────────────────────────── */
@media (max-width: 1100px) {
  .nav__inner { gap: 1rem; }
  .nav__links { gap: 0.12rem; }
  .nav__link {
    font-size: 0.72rem;
    padding: 0.35rem 0.65rem;
  }

  .home-philosophy-grid,
  .home-insights-grid,
  .about-philosophy-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .project-detail__body {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .project-detail__sidebar {
    position: static;
  }

  .hero__bio {
    max-width: 100%;
  }
}

@media (max-width: 768px) {

  body.nav-open {
    overflow: hidden;
  }

  .nav__links { display: none; }
  .nav__links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 1rem;
    max-height: calc(100vh - 4.75rem);
    overflow-y: auto;
    box-shadow: 0 24px 40px rgba(0, 0, 0, 0.25);
  }
  .nav__menu-btn { display: flex; }
  .nav__logo { font-size: 0.95rem; gap: 0.5rem; }
  .nav__logo-mark { width: 26px; height: 26px; }
  .nav__logo-text {
    max-width: 140px;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .nav__link { width: 100%; }
  .nav__link--cta { justify-content: center; }

  .hero__stats { grid-template-columns: repeat(3, 1fr); }
  .hero__brand-mark {
    top: auto;
    right: 0.5rem;
    bottom: -1.4rem;
    transform: none;
    width: min(58vw, 260px);
    opacity: 0.14;
  }

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

  .kg-visual { grid-template-columns: 1fr; }

  .article-card { grid-template-columns: 1fr; gap: 0.5rem; }
  .article-card__num { display: none; }
}