/* =====================================================
   iTwin Lab – Custom Stylesheet
   Colors from logo:
     Primary Navy : #1b2d6e
     Accent Teal  : #2bc8c8
   ===================================================== */

:root {
  --primary:        #1b2d6e;
  --primary-dark:   #12205a;
  --primary-light:  #2a4090;
  --teal:           #2bc8c8;
  --teal-dark:      #1da8a8;
  --teal-light:     #5dd9d9;
  --light-bg:       #f4f7fb;
  --card-bg:        #ffffff;
  --text-main:      #1a2340;
  --text-muted:     #6b7a99;
  --border:         #e0e8f5;
  --shadow-sm:      0 2px 12px rgba(27,45,110,.08);
  --shadow-md:      0 8px 32px rgba(27,45,110,.14);
  --shadow-lg:      0 20px 60px rgba(27,45,110,.18);
  --radius-sm:      8px;
  --radius-md:      14px;
  --radius-lg:      24px;
  --transition:     all .3s cubic-bezier(.4,0,.2,1);
}

/* ─── Base ─── */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-main);
  background: #fff;
  overflow-x: hidden;
}

h1,h2,h3,h4,h5,h6 {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  line-height: 1.25;
}

.text-teal       { color: var(--teal) !important; }
.text-teal-light { color: var(--teal-light) !important; }

/* ─── Navbar ─── */
#mainNavbar {
  background: transparent;
  padding: .9rem 0;
  transition: var(--transition);
}
#mainNavbar.scrolled {
  background: rgba(18,32,90,.97);
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 24px rgba(0,0,0,.25);
  padding: .55rem 0;
}
.navbar-brand img { transition: var(--transition); }
.navbar-brand:hover img { opacity: .85; }

.nav-link {
  font-weight: 500;
  font-size: .92rem;
  letter-spacing: .02em;
  color: rgba(255,255,255,.82) !important;
  padding: .45rem .85rem !important;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav-link:hover,
.nav-link.active-link {
  color: var(--teal) !important;
  background: rgba(43,200,200,.1);
}

.btn-join {
  background: var(--teal) !important;
  color: var(--primary) !important;
  font-weight: 700 !important;
  border-radius: 50px !important;
  padding: .45rem 1.3rem !important;
}
.btn-join:hover,
.btn-join.active-link {
  background: var(--teal-dark) !important;
  color: var(--primary) !important;
  transform: translateY(-1px);
}

/* ─── Buttons ─── */
.btn-primary-custom {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border: none;
  border-radius: 50px;
  font-weight: 600;
  letter-spacing: .02em;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(27,45,110,.3);
}
.btn-primary-custom:hover {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(27,45,110,.4);
}

.btn-outline-custom {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,.55);
  border-radius: 50px;
  font-weight: 600;
  transition: var(--transition);
}
.btn-outline-custom:hover {
  background: rgba(255,255,255,.12);
  color: #fff;
  border-color: var(--teal);
  transform: translateY(-2px);
}

.btn-teal {
  background: linear-gradient(135deg, var(--teal), var(--teal-dark));
  color: var(--primary);
  border: none;
  border-radius: 50px;
  font-weight: 700;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(43,200,200,.35);
}
.btn-teal:hover {
  background: linear-gradient(135deg, var(--teal-light), var(--teal));
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(43,200,200,.45);
}

/* ─── Section Utilities ─── */
.section-pad { padding: 6rem 0; }

.bg-light-custom { background: var(--light-bg); }

.section-tag {
  display: inline-block;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--teal);
  background: rgba(43,200,200,.12);
  padding: .32rem 1rem;
  border-radius: 50px;
  margin-bottom: .75rem;
}
.section-tag-light {
  color: var(--teal-light);
  background: rgba(43,200,200,.18);
}

.section-title {
  font-size: clamp(1.9rem, 3.5vw, 2.8rem);
  color: var(--primary);
}

.section-text {
  color: var(--text-muted);
  font-size: 1.02rem;
}

/* ─── Hero ─── */
.hero-section {
  position: relative;
  min-height: 100vh;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
  overflow: hidden;
  display: flex;
  align-items: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 70% 60%, rgba(43,200,200,.18) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 20% 30%, rgba(43,200,200,.10) 0%, transparent 60%);
  z-index: 0;
}

/* Animated grid lines */
.hero-particles {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(43,200,200,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43,200,200,.06) 1px, transparent 1px);
  background-size: 60px 60px;
  animation: gridPan 30s linear infinite;
}
@keyframes gridPan {
  0%   { background-position: 0 0; }
  100% { background-position: 60px 60px; }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--teal);
  background: rgba(43,200,200,.15);
  border: 1px solid rgba(43,200,200,.3);
  padding: .4rem 1.2rem;
  border-radius: 50px;
}

.hero-title {
  font-size: clamp(3.5rem, 8vw, 6.5rem);
  font-weight: 800;
  color: #fff;
  letter-spacing: -.02em;
  line-height: 1;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.55rem);
  color: rgba(255,255,255,.75);
  font-weight: 400;
  letter-spacing: .03em;
}

.hero-desc {
  font-size: 1.05rem;
  color: rgba(255,255,255,.65);
  max-width: 620px;
  margin-left: auto;
  margin-right: auto;
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
}
.hero-scroll-indicator span {
  display: block;
  width: 26px;
  height: 44px;
  border: 2px solid rgba(255,255,255,.4);
  border-radius: 13px;
  position: relative;
}
.hero-scroll-indicator span::after {
  content: '';
  display: block;
  width: 4px;
  height: 8px;
  background: var(--teal);
  border-radius: 2px;
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  animation: scrollBob 1.6s ease-in-out infinite;
}
@keyframes scrollBob {
  0%,100% { top: 6px; opacity: 1; }
  50%      { top: 18px; opacity: .3; }
}

/* ─── Stats Strip ─── */
.stats-strip {
  background: linear-gradient(90deg, var(--primary-dark), var(--primary));
  border-bottom: 1px solid rgba(43,200,200,.2);
}
.stat-item { color: #fff; }
.stat-icon {
  font-size: 2rem;
  color: var(--teal);
  margin-bottom: .3rem;
}
.stat-label {
  font-size: .88rem;
  font-weight: 500;
  color: rgba(255,255,255,.72);
  letter-spacing: .02em;
}

/* ─── About Visual ─── */
.about-visual {
  position: relative;
  width: 340px;
  height: 340px;
}
.visual-ring {
  position: absolute;
  border-radius: 50%;
  border: 1.5px solid rgba(43,200,200,.22);
  inset: 0;
  animation: ringPulse 4s ease-in-out infinite;
}
.ring-1 { animation-delay: 0s; }
.ring-2 { transform: scale(.72); animation-delay: .6s; }
.ring-3 { transform: scale(.44); animation-delay: 1.2s; }
@keyframes ringPulse {
  0%,100% { opacity: .22; }
  50%      { opacity: .6; }
}

.visual-core {
  position: absolute;
  inset: 30%;
  background: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  padding: 1.25rem;
}
.visual-logo { max-width: 90px; }

.visual-node {
  position: absolute;
  width: 46px;
  height: 46px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--teal);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: var(--shadow-sm);
  border: 2px solid rgba(43,200,200,.3);
  animation: nodeFloat 3.5s ease-in-out infinite;
}
.node-1 { top:  8%; left:  50%; transform: translate(-50%,0); animation-delay: 0s; }
.node-2 { top:  50%; right: 4%; transform: translate(0,-50%); animation-delay: .5s; }
.node-3 { bottom: 8%; left: 50%; transform: translate(-50%,0); animation-delay: 1s; }
.node-4 { top:  50%; left:  4%; transform: translate(0,-50%); animation-delay: 1.5s; }
@keyframes nodeFloat {
  0%,100% { transform: translate(var(--tx,0), var(--ty,0)); }
  50%      { transform: translate(var(--tx,0), calc(var(--ty,0) - 6px)); }
}
.node-1,.node-3 { --tx: -50%; }
.node-2,.node-4 { --ty: -50%; }

/* ─── Vision ─── */
.vision-section {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  position: relative;
  overflow: hidden;
}
.vision-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 60% at 80% 50%, rgba(43,200,200,.15) 0%, transparent 70%);
}

.vision-card {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(43,200,200,.25);
  border-radius: var(--radius-lg);
  padding: 3rem 2.5rem;
  backdrop-filter: blur(10px);
  position: relative;
  z-index: 1;
}
.vision-icon {
  font-size: 3rem;
  color: var(--teal);
}
.vision-quote {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  font-weight: 500;
  color: rgba(255,255,255,.9);
  line-height: 1.75;
  margin: 0;
  border: none;
  font-style: normal;
}

/* ─── Mission Cards ─── */
.mission-card {
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: 2rem 1.75rem;
  border: 1px solid var(--border);
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}
.mission-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--teal);
}
.mission-icon {
  width: 54px;
  height: 54px;
  background: linear-gradient(135deg, rgba(43,200,200,.12), rgba(43,200,200,.22));
  color: var(--teal-dark);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}
.mission-card h5 {
  font-size: 1.08rem;
  color: var(--primary);
  margin-bottom: .5rem;
}
.mission-card p {
  font-size: .94rem;
  color: var(--text-muted);
  margin: 0;
}

/* ─── Research Cards ─── */
.research-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}
.research-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--teal), var(--primary-light));
  opacity: 0;
  transition: var(--transition);
}
.research-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.research-card:hover::before { opacity: 1; }

.research-card-featured {
  background: linear-gradient(145deg, var(--primary) 0%, var(--primary-light) 100%);
  border-color: transparent;
  color: #fff;
}
.research-card-featured .research-title,
.research-card-featured .research-desc { color: rgba(255,255,255,.9); }
.research-card-featured .rtag {
  background: rgba(255,255,255,.12);
  color: rgba(255,255,255,.85);
  border-color: rgba(255,255,255,.2);
}

.research-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.25rem;
}
.research-icon {
  width: 56px;
  height: 56px;
  background: rgba(43,200,200,.12);
  color: var(--teal);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
}
.research-card-featured .research-icon {
  background: rgba(43,200,200,.22);
  color: var(--teal-light);
}

.research-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: rgba(27,45,110,.08);
  line-height: 1;
  font-family: 'Space Grotesk', sans-serif;
}
.research-card-featured .research-number { color: rgba(255,255,255,.1); }

.research-title {
  font-size: 1.25rem;
  color: var(--primary);
  margin-bottom: .75rem;
}
.research-desc {
  font-size: .95rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}
.research-tags { display: flex; flex-wrap: wrap; gap: .4rem; }
.rtag {
  font-size: .76rem;
  font-weight: 600;
  padding: .22rem .75rem;
  border-radius: 50px;
  background: rgba(43,200,200,.1);
  color: var(--teal-dark);
  border: 1px solid rgba(43,200,200,.2);
  letter-spacing: .03em;
}

/* ─── Members ─── */
.member-head-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.member-head-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
.member-avatar {
  width: 90px;
  height: 90px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--teal);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
}
.member-badge {
  display: inline-block;
  font-size: .76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--teal-dark);
  background: rgba(43,200,200,.12);
  padding: .22rem .9rem;
  border-radius: 50px;
}
.member-name {
  font-size: 1.3rem;
  color: var(--primary);
  margin-bottom: .3rem;
}
.member-affiliation {
  font-size: .88rem;
  color: var(--text-muted);
}

.member-group-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 2rem 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.member-group-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  border-color: var(--teal);
}
.member-group-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, rgba(43,200,200,.12), rgba(43,200,200,.22));
  color: var(--teal-dark);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin: 0 auto 1rem;
}
.member-group-title {
  font-size: 1.1rem;
  color: var(--primary);
  margin-bottom: 1rem;
}
.member-slots { display: flex; flex-direction: column; gap: .55rem; }
.slot {
  font-size: .88rem;
  color: var(--text-muted);
  background: var(--light-bg);
  border-radius: var(--radius-sm);
  padding: .5rem .9rem;
  text-align: left;
  display: flex;
  align-items: center;
}

/* ─── Recruitment ─── */
.recruitment-section {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
  position: relative;
  overflow: hidden;
}
.recruitment-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(43,200,200,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43,200,200,.04) 1px, transparent 1px);
  background-size: 40px 40px;
}
.text-white-70 { color: rgba(255,255,255,.7) !important; }

.opportunities-list {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(43,200,200,.2);
  border-radius: var(--radius-lg);
  padding: 2rem;
  backdrop-filter: blur(10px);
  position: relative;
  z-index: 1;
}
.opp-heading {
  font-size: 1rem;
  font-weight: 700;
  color: var(--teal);
  text-transform: uppercase;
  letter-spacing: .1em;
  margin-bottom: 1.25rem;
}
.opp-items li {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: .85rem 0;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.opp-items li:last-child { border-bottom: none; }
.opp-icon {
  width: 38px;
  height: 38px;
  min-width: 38px;
  background: rgba(43,200,200,.18);
  color: var(--teal-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}
.opp-items strong {
  display: block;
  font-size: .96rem;
  color: rgba(255,255,255,.92);
  margin-bottom: .15rem;
}
.opp-items p {
  font-size: .86rem;
  color: rgba(255,255,255,.55);
  margin: 0;
}

/* ─── Footer ─── */
.footer {
  background: var(--primary-dark);
  padding: 2rem 0;
  border-top: 1px solid rgba(43,200,200,.15);
}
.footer-logo { opacity: .9; }
.footer-tagline {
  font-size: .92rem;
  font-weight: 600;
  color: rgba(255,255,255,.82);
}
.footer-affiliation {
  font-size: .82rem;
  color: var(--teal);
  margin-top: .1rem;
}
.footer-copy {
  font-size: .82rem;
  color: rgba(255,255,255,.45);
}

/* ─── Scroll-reveal animation ─── */
[data-aos] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .65s ease, transform .65s ease;
}
[data-aos].aos-visible {
  opacity: 1;
  transform: translateY(0);
}
[data-aos][data-aos-delay="80"]  { transition-delay: .08s; }
[data-aos][data-aos-delay="100"] { transition-delay: .10s; }
[data-aos][data-aos-delay="120"] { transition-delay: .12s; }
[data-aos][data-aos-delay="160"] { transition-delay: .16s; }
[data-aos][data-aos-delay="240"] { transition-delay: .24s; }
[data-aos][data-aos-delay="320"] { transition-delay: .32s; }
[data-aos="fade-right"] { transform: translateX(-28px); }
[data-aos="fade-left"]  { transform: translateX( 28px); }
[data-aos="fade-right"].aos-visible,
[data-aos="fade-left"].aos-visible  { transform: translateX(0); }

/* ─── Responsive ─── */
@media (max-width: 991.98px) {
  .section-pad { padding: 4rem 0; }
  .about-visual { width: 280px; height: 280px; }
}

@media (max-width: 767.98px) {
  .hero-title { font-size: 3rem; }
  .section-pad { padding: 3rem 0; }
  .vision-card { padding: 2rem 1.25rem; }
  .about-visual { width: 240px; height: 240px; }
  .opportunities-list { padding: 1.5rem 1rem; }
}

@media (max-width: 575.98px) {
  .hero-title { font-size: 2.4rem; }
  .research-card { padding: 1.5rem; }
}