/* ============================================
   UI² Lab — Urban Intelligence & IoT Lab
   Design language adapted from AI V&V Lab
   KFUPM Green + Saudi Sand/Gold + Urban Night
   ============================================ */

:root {
  --primary: #006747;
  --primary-light: #e8f5f0;
  --primary-dark: #004d35;
  --primary-darker: #003325;
  --primary-rgb: 0, 103, 71;

  --accent-sand: #c4a35a;
  --accent-sand-light: #f5f0e0;
  --accent-sand-dark: #9e8340;

  --night: #0c1f26;          /* urban night teal-navy */
  --teal-deep: #004040;

  --text: #1a1a1a;
  --text-secondary: #6b7280;
  --text-light: #9ca3af;
  --bg: #ffffff;
  --bg-alt: #fafafa;
  --border: #e5e7eb;
  --border-light: #f3f4f6;

  --radius: 12px;
  --radius-lg: 16px;
  --shadow: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.03);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.06), 0 4px 8px rgba(0,0,0,0.04);
  --shadow-hover: 0 12px 32px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.05);

  --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font: var(--font-body);
  --max-width: 1100px;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; scroll-padding-top: 72px; }
body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
h1,h2,h3,h4,h5,h6 { font-family: var(--font-heading); }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }

/* ---- Icons ---- */
.icon { width: 1em; height: 1em; flex-shrink: 0; vertical-align: -0.125em; }
.icon-lg { width: 1.35em; height: 1.35em; }
.icon-xs { width: 0.85em; height: 0.85em; }

.skip-link { position: absolute; top: -100%; left: 1rem; padding: 0.5rem 1rem; background: var(--primary); color: #fff; border-radius: var(--radius); z-index: 1000; font-size: 0.875rem; }
.skip-link:focus { top: 0.5rem; color: #fff; }

/* ---- Navigation ---- */
.site-nav { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.85); border-bottom: 1px solid rgba(229,231,235,0.5); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); }
.nav-container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav-logo { display: flex; align-items: center; gap: 0.5rem; font-weight: 700; font-size: 1.125rem; color: var(--primary); }
.nav-logo:hover { color: var(--primary-dark); }
.logo-mark { position: relative; display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; background: linear-gradient(150deg, var(--primary) 0%, var(--teal-deep) 100%); color: #fff; border-radius: 10px; font-size: 0.8rem; font-weight: 800; letter-spacing: -0.02em; font-family: var(--font-heading); overflow: hidden; }
.logo-lattice { position: absolute; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; }
.logo-text { letter-spacing: -0.02em; font-family: var(--font-heading); }
.nav-links { display: flex; align-items: center; list-style: none; gap: 0.25rem; }
.nav-links a { display: flex; align-items: center; padding: 0.5rem 0.75rem; font-size: 0.9rem; font-weight: 500; color: var(--text-secondary); border-bottom: 2px solid transparent; transition: all var(--transition); }
.nav-links a:hover { color: var(--primary); border-bottom-color: var(--primary); }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 0.5rem; border-radius: var(--radius); }
.hamburger { display: block; width: 20px; height: 2px; background: var(--text); position: relative; transition: background var(--transition); }
.hamburger::before, .hamburger::after { content: ''; display: block; width: 20px; height: 2px; background: var(--text); position: absolute; transition: transform var(--transition); }
.hamburger::before { top: -6px; } .hamburger::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .hamburger { background: transparent; }
.nav-toggle[aria-expanded="true"] .hamburger::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .hamburger::after { transform: translateY(-6px) rotate(-45deg); }

/* ---- Hero with video ---- */
.hero-wrap { position: relative; background: var(--night); overflow: hidden; }
.hero-video { position: absolute; top: 50%; left: 50%; min-width: 100%; min-height: 100%; width: auto; height: auto; transform: translate(-50%, -50%); object-fit: cover; z-index: 0; filter: saturate(0.85); }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(160deg, rgba(4,26,22,0.93) 0%, rgba(0,77,53,0.82) 45%, rgba(12,31,38,0.94) 100%); z-index: 1; }
.hero-pattern { position: absolute; inset: 0; background-image: url('../img/pattern-desert.svg'); background-size: cover; background-position: center; opacity: 0.5; pointer-events: none; z-index: 1; }
.hero { position: relative; z-index: 2; text-align: center; padding: 6.5rem 1.5rem 5.5rem; max-width: var(--max-width); margin: 0 auto; }
.hero-eyebrow { display: inline-block; font-family: var(--font-heading); font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.18em; color: var(--accent-sand); margin-bottom: 1.5rem; }
.hero-title { font-family: var(--font-heading); font-size: 3.4rem; font-weight: 800; letter-spacing: -0.03em; color: #fff; line-height: 1.08; margin-bottom: 1.1rem; }
.hero-title .highlight { color: var(--accent-sand); }
.hero-tagline { font-size: 1.18rem; color: rgba(255,255,255,0.82); max-width: 680px; margin: 0 auto 2.25rem; line-height: 1.65; }
.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.hero-wrap .btn-primary { background: #fff; color: var(--primary); border-color: #fff; box-shadow: 0 2px 12px rgba(0,0,0,0.15); }
.hero-wrap .btn-primary:hover { background: var(--accent-sand-light); border-color: var(--accent-sand-light); color: var(--primary-dark); }
.hero-wrap .btn-outline { background: rgba(0,0,0,0.15); color: #fff; border-color: rgba(255,255,255,0.4); }
.hero-wrap .btn-outline:hover { background: rgba(255,255,255,0.12); border-color: rgba(255,255,255,0.6); color: #fff; box-shadow: none; }

/* ---- Impact strip ---- */
.impact-strip { border-bottom: 1px solid var(--border); }
.impact-strip-inner { max-width: var(--max-width); margin: 0 auto; display: flex; justify-content: center; }
.impact-stat { flex: 1; text-align: center; padding: 2rem 1.5rem; border-right: 1px solid var(--border-light); }
.impact-stat:last-child { border-right: none; }
.impact-number { display: block; font-family: var(--font-heading); font-size: 2.5rem; font-weight: 800; color: var(--accent-sand-dark); letter-spacing: -0.02em; line-height: 1; }
.impact-label { display: block; font-size: 0.75rem; color: var(--text-secondary); margin-top: 0.4rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; }

/* ---- Divider ---- */
.brand-divider { height: 40px; background-image: url('../img/divider.svg'); background-repeat: no-repeat; background-position: center; background-size: 200px 40px; opacity: 0.25; margin: 0 auto; }

/* ---- Buttons ---- */
.btn { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.75rem 1.75rem; font-size: 0.95rem; font-weight: 600; font-family: var(--font-heading); border-radius: 24px; border: 2px solid transparent; cursor: pointer; transition: all var(--transition); }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); box-shadow: 0 2px 8px rgba(0,103,71,0.2); }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; transform: translateY(-1px); }
.btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-1px); }

/* ---- Sections ---- */
.section { padding: 4rem 1.5rem; max-width: var(--max-width); margin: 0 auto; }
.section--alt { position: relative; background: var(--bg-alt); padding: 4rem 1.5rem; }
.section--alt::before { content: ''; position: absolute; inset: 0; background-image: url('../img/pattern-network.svg'); background-size: 200px 200px; opacity: 0.06; pointer-events: none; }
.section--alt .section-inner { position: relative; max-width: var(--max-width); margin: 0 auto; }
.section-header { margin-bottom: 2.5rem; }
.section-label { display: inline-block; font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--primary); background: var(--primary-light); padding: 4px 12px; border-radius: 20px; margin-bottom: 0.75rem; }
.section-title { font-size: 1.85rem; font-weight: 700; letter-spacing: -0.02em; color: var(--text); }
.section-subtitle { margin-top: 0.5rem; color: var(--text-secondary); font-size: 1rem; max-width: 640px; }

.editorial-heading { font-size: 2.1rem; font-weight: 800; letter-spacing: -0.03em; line-height: 1.2; margin-bottom: 1rem; }
.editorial-lede { font-size: 1.22rem; line-height: 1.75; color: var(--text-secondary); max-width: 760px; margin-bottom: 2rem; }
.editorial-lede a { text-decoration: underline; text-underline-offset: 3px; }
.about-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; max-width: 980px; }
.about-cols p { font-size: 1.02rem; line-height: 1.75; color: var(--text); }
.about-cols strong { color: var(--primary-dark); }

/* ---- Cards ---- */
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
.card-grid--5 { grid-template-columns: repeat(3, 1fr); }
.card-grid--5 .card:nth-child(4), .card-grid--5 .card:nth-child(5) { transform: none; }
.card { position: relative; overflow: hidden; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.75rem; transition: all var(--transition); box-shadow: var(--shadow); }
.card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.card-icon { display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 44px; background: var(--primary-light); color: var(--primary); border-radius: var(--radius); font-size: 1.15rem; margin-bottom: 1rem; }
.card-title { font-size: 1.05rem; font-weight: 600; margin-bottom: 0.5rem; }
.card-text { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; }

/* ---- Featured project ---- */
.project-featured { display: grid; grid-template-columns: 1.15fr 1fr; gap: 2.5rem; align-items: center; background: var(--night); border-radius: var(--radius-lg); overflow: hidden; padding: 2rem; margin-bottom: 2.5rem; box-shadow: var(--shadow-lg); }
.project-featured-media video { width: 100%; border-radius: var(--radius); display: block; }
.project-featured-media > video { aspect-ratio: 16 / 9; object-fit: cover; background: #000; }
.media-strip { display: grid; grid-template-columns: 1fr; gap: 0.75rem; margin-top: 0.75rem; }
.media-strip figure { margin: 0; }
.media-strip video { width: 100%; border-radius: 8px; display: block; background: #fff; }
.media-strip figcaption { font-size: 0.7rem; color: rgba(255,255,255,0.55); margin-top: 0.3rem; }
.project-featured-body h3 { color: #fff; font-size: 1.5rem; font-weight: 700; letter-spacing: -0.02em; margin: 0.6rem 0 0.75rem; }
.project-featured-body p { color: rgba(255,255,255,0.78); font-size: 0.97rem; line-height: 1.75; margin-bottom: 1.1rem; }
.project-tag { display: inline-block; font-size: 0.68rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; padding: 3px 10px; border-radius: 20px; }
.project-tag--featured { background: var(--accent-sand); color: var(--night); }

/* ---- Project grid ---- */
.project-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.project-card { display: flex; flex-direction: column; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: all var(--transition); }
.project-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.project-media { background: #f4f5f4; border-bottom: 1px solid var(--border-light); display: flex; align-items: center; justify-content: center; height: 230px; overflow: hidden; }
.project-media img, .project-media video { width: 100%; height: 100%; object-fit: contain; padding: 0.75rem; }
.project-body { padding: 1.5rem 1.6rem 1.6rem; display: flex; flex-direction: column; flex: 1; }
.project-body h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.5rem; letter-spacing: -0.01em; }
.project-body p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 1rem; flex: 1; }
.project-meta { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.chip { display: inline-flex; align-items: center; gap: 0.3rem; font-size: 0.72rem; font-weight: 600; color: var(--primary-dark); background: var(--primary-light); padding: 3px 10px; border-radius: 14px; }
.chip--status { background: var(--accent-sand-light); color: var(--accent-sand-dark); }
.chip--link { background: var(--night); color: #fff; }
.chip--link:hover { background: var(--primary); color: #fff; }

/* ---- Testbeds ---- */
.testbed-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.testbed { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.75rem; box-shadow: var(--shadow); transition: all var(--transition); }
.testbed:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.testbed-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1rem; }
.testbed-head i { font-size: 1.4rem; color: var(--primary); }
.testbed h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.5rem; }
.testbed p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.7; }
.status { font-size: 0.66rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; padding: 3px 10px; border-radius: 12px; }
.status--live { background: var(--primary-light); color: var(--primary-dark); }
.status--soon { background: var(--accent-sand-light); color: var(--accent-sand-dark); }
.status--planned { background: var(--border-light); color: var(--text-secondary); }

/* ---- Vision & objectives ---- */
.vision-quote { font-family: var(--font-heading); font-size: 1.3rem; font-weight: 500; line-height: 1.6; color: var(--primary-dark); padding: 0.5rem 0 0.5rem 1.5rem; max-width: 860px; margin-bottom: 2.5rem; }
.objective-list { counter-reset: obj; list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem 2.5rem; max-width: 980px; }
.objective-list li { counter-increment: obj; position: relative; padding-left: 3rem; font-size: 0.95rem; line-height: 1.7; color: var(--text-secondary); }
.objective-list li strong { color: var(--text); display: block; margin-bottom: 0.15rem; }
.objective-list li::before { content: counter(obj, decimal-leading-zero); position: absolute; left: 0; top: 0.1rem; font-family: var(--font-heading); font-size: 1.1rem; font-weight: 800; color: var(--accent-sand); }

/* ---- People ---- */
.pi-section { display: flex; gap: 3rem; align-items: flex-start; max-width: 820px; margin-bottom: 2.5rem; }
.pi-photo-wrap { flex-shrink: 0; }
.pi-photo { width: 140px; height: 140px; border-radius: 50%; object-fit: cover; border: 3px solid var(--primary-light); box-shadow: var(--shadow-md); }
.pi-content { flex: 1; }
.pi-label { display: inline-block; font-family: var(--font-heading); font-size: 0.7rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; color: var(--primary); background: var(--primary-light); padding: 3px 10px; border-radius: 20px; margin-bottom: 0.75rem; }
.pi-name { font-size: 1.6rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 0.25rem; }
.pi-role { font-size: 0.95rem; color: var(--primary); font-weight: 500; margin-bottom: 1rem; }
.pi-bio { font-size: 1rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 1.25rem; }
.pi-links { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.pi-links a { display: inline-flex; align-items: center; gap: 0.35rem; padding: 0.4rem 0.85rem; border-radius: 20px; background: var(--bg-alt); color: var(--text-secondary); font-size: 0.8rem; font-weight: 500; border: 1px solid var(--border); transition: all var(--transition); }
.pi-links a:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.people-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; max-width: 980px; }
.person { display: flex; align-items: center; gap: 0.9rem; padding: 1rem 1.1rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); box-shadow: var(--shadow); }
.person-avatar { flex-shrink: 0; display: inline-flex; align-items: center; justify-content: center; width: 46px; height: 46px; border-radius: 50%; background: var(--primary-light); color: var(--primary); font-family: var(--font-heading); font-weight: 700; font-size: 0.9rem; }
.person-name { font-size: 0.95rem; font-weight: 600; }
.person-role { font-size: 0.8rem; color: var(--text-secondary); line-height: 1.45; }
.positions-cta { padding: 3rem 0 0; border-top: 1px solid var(--border); margin-top: 3rem; }
.positions-cta h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 0.5rem; }
.positions-cta p { color: var(--text-secondary); margin-bottom: 1.25rem; max-width: 560px; line-height: 1.6; }

/* ---- Footer ---- */
.site-footer { position: relative; background: linear-gradient(160deg, var(--primary-darker) 0%, var(--primary) 50%, var(--teal-deep) 100%); margin-top: 4rem; overflow: hidden; color: rgba(255,255,255,0.8); }
.site-footer .footer-pattern { position: absolute; inset: 0; background-image: url('../img/pattern-desert.svg'); background-size: cover; background-position: center; opacity: 0.35; pointer-events: none; }
.footer-container { position: relative; z-index: 2; max-width: var(--max-width); margin: 0 auto; padding: 3rem 1.5rem 1.5rem; }
.footer-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 2rem; margin-bottom: 2rem; }
.footer-lab-name { font-family: var(--font-heading); font-weight: 700; font-size: 1.05rem; color: #fff; margin-bottom: 0.25rem; }
.footer-affiliation { font-size: 0.85rem; color: rgba(255,255,255,0.55); margin-bottom: 1rem; line-height: 1.6; }
.footer-links { display: flex; gap: 1rem; }
.footer-links a { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: 50%; background: rgba(255,255,255,0.1); color: rgba(255,255,255,0.7); font-size: 1rem; border: 1px solid rgba(255,255,255,0.15); transition: all var(--transition); }
.footer-links a:hover { color: #fff; border-color: rgba(255,255,255,0.4); background: rgba(255,255,255,0.2); }
.footer-nav-columns { display: flex; gap: 4rem; }
.footer-nav-col { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-nav-heading { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; color: rgba(255,255,255,0.4); margin-bottom: 0.25rem; }
.footer-nav-col a { font-size: 0.85rem; font-weight: 500; color: rgba(255,255,255,0.6); }
.footer-nav-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.12); padding-top: 1.5rem; }
.footer-bottom p { font-size: 0.8rem; color: rgba(255,255,255,0.4); }

/* ---- Animations ---- */
@keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.fade-in { opacity: 0; transform: translateY(20px); }
.fade-in.visible { animation: fadeUp 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards; }
@media (prefers-reduced-motion: reduce) {
  .fade-in { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}

/* ---- Responsive ---- */
@media (max-width: 960px) {
  .card-grid--5 { grid-template-columns: 1fr 1fr; }
  .project-featured { grid-template-columns: 1fr; }
  .testbed-grid { grid-template-columns: 1fr; }
  .people-row { grid-template-columns: 1fr; }
  .objective-list { grid-template-columns: 1fr; }
  .about-cols { grid-template-columns: 1fr; gap: 1.25rem; }
}
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--border); flex-direction: column; align-items: stretch; padding: 0.5rem 1rem 1rem; box-shadow: var(--shadow-lg); }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 0.75rem 1rem; }
  .hero { padding: 4rem 1rem 3.5rem; }
  .hero-title { font-size: 2.3rem; }
  .hero-tagline { font-size: 1.05rem; }
  .impact-strip-inner { flex-wrap: wrap; }
  .impact-stat { flex: 1 1 50%; border-bottom: 1px solid var(--border-light); padding: 1.5rem 1rem; }
  .impact-stat:nth-child(2) { border-right: none; }
  .impact-stat:nth-child(3), .impact-stat:nth-child(4) { border-bottom: none; }
  .impact-number { font-size: 2rem; }
  .card-grid--5 { grid-template-columns: 1fr; }
  .project-grid { grid-template-columns: 1fr; }
  .pi-section { flex-direction: column; align-items: center; text-align: center; }
  .pi-links { justify-content: center; }
  .footer-top { flex-direction: column; align-items: center; text-align: center; gap: 1.5rem; }
  .footer-nav-columns { gap: 3rem; justify-content: center; }
  .footer-nav-col { align-items: center; }
  .section { padding: 2.5rem 1rem; }
  .section--alt { padding: 2.5rem 1rem; }
  .section-title { font-size: 1.4rem; }
  .editorial-heading { font-size: 1.6rem; }
  .editorial-lede { font-size: 1.08rem; }
}
@media (max-width: 480px) {
  .hero-title { font-size: 1.9rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .hero-actions .btn { width: 100%; max-width: 280px; justify-content: center; }
  .impact-stat { flex: 1 1 100%; border-right: none; }
  .media-strip { grid-template-columns: 1fr; }
}