/* =====================================================
   home.css  –  Index page specific styles
   Depends on: style.css (loaded first)
   MEMBER Lab, IIT Kharagpur
   ===================================================== */

/* ══════════════════════════════════════
   HERO
══════════════════════════════════════ */
.hero {
  position: relative;
  min-height: 82vh;
  background:
    linear-gradient(135deg, rgba(10,37,64,0.88) 0%, rgba(26,58,110,0.78) 100%),
    url('../images/background.png') center/cover no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 72px 24px 60px;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 15% 20%, rgba(201,169,97,0.18) 0%, transparent 35%),
    radial-gradient(circle at 85% 80%, rgba(232,119,34,0.15) 0%, transparent 35%);
  animation: bgShift 15s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes bgShift {
  0%   { transform: scale(1)   rotate(0deg); }
  100% { transform: scale(1.1) rotate(2deg); }
}

.hero-inner {
  max-width: 960px;
  text-align: center;
  position: relative;
  z-index: 2;
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

/* Badge pill */
.hero .badge {
  display: inline-block;
  padding: 8px 22px;
  background: rgba(201,169,97,0.18);
  border: 1px solid rgba(201,169,97,0.5);
  border-radius: 30px;
  color: var(--accent-gold);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  backdrop-filter: blur(10px);
}

/* Main heading */
.hero h1 {
  font-size: 3.4rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.5px;
  text-shadow: 0 4px 20px rgba(0,0,0,0.3);
  margin: 0;
}

.hero h1 .accent { color: var(--accent-gold); }

.hero .tagline {
  font-size: 1.2rem;
  font-weight: 300;
  color: #e2e8f0;
  font-style: italic;
  margin: 0;
}

.hero .acronym-explainer {
  font-size: 1rem;
  color: #cbd5e1;
  max-width: 700px;
  line-height: 1.75;
  margin: 0;
}

/* CTA buttons */
.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 4px;
}

.btn {
  padding: 14px 34px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent-gold);
  color: var(--primary-navy);
}
.btn-primary:hover {
  background: #d9bb73;
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(201,169,97,0.4);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.5);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: #fff;
}

/* ══════════════════════════════════════
   STATS STRIP
══════════════════════════════════════ */
.stats-strip {
  background: #fff;
  padding: 40px 24px;
  border-bottom: 1px solid var(--border-soft);
}

.stats-grid {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item .number {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--primary-navy);
  line-height: 1;
}

.stat-item .number .plus { color: var(--accent-gold); }

.stat-item .label {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-top: 8px;
  font-weight: 600;
}

/* ══════════════════════════════════════
   DIRECTOR / PI SECTION
══════════════════════════════════════ */
.director-section {
  padding: 70px 24px;
  background: linear-gradient(180deg, var(--bg-light) 0%, #fff 100%);
}

.director-card {
  max-width: 1100px;
  margin: 0 auto;
  background: #fff;
  border-radius: 20px;
  overflow: hidden;
  display: grid;
  grid-template-columns: 300px 1fr;
  box-shadow: var(--shadow-medium);
  border: 1px solid var(--border-soft);
}

/* Photo side */
.director-card .img-side {
  background: linear-gradient(135deg, var(--primary-navy), var(--primary-blue));
  padding: 40px 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  position: relative;
}

.director-card .img-side::after {
  content: '';
  position: absolute;
  top: 0; right: 0; bottom: 0;
  width: 4px;
  background: var(--accent-gold);
}

.director-card .img-side img {
  width: 180px;
  height: 220px;
  object-fit: cover;
  border-radius: 12px;
  border: 4px solid var(--accent-gold);
  box-shadow: 0 12px 30px rgba(0,0,0,0.3);
}

.director-card .img-side .position-tag {
  padding: 5px 14px;
  background: rgba(201,169,97,0.2);
  color: var(--accent-gold);
  border: 1px solid var(--accent-gold);
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Info side */
.director-card .info-side {
  padding: 40px;
}

.director-card .info-side h2 {
  font-size: 1.85rem;
  color: var(--primary-navy);
  font-weight: 800;
  margin-bottom: 6px;
}

.director-card .info-side .designation {
  color: var(--accent-orange);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 3px;
}

.director-card .info-side .dept {
  color: var(--text-muted);
  font-size: 0.87rem;
  margin-bottom: 16px;
}

.director-card .info-side .links {
  display: flex;
  gap: 18px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.director-card .info-side .links a {
  color: var(--accent-cyan);
  font-size: 0.88rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: color var(--transition);
}
.director-card .info-side .links a:hover { color: var(--accent-orange); }

.director-card .info-side .bio {
  color: var(--text-dark);
  font-size: 0.93rem;
  line-height: 1.78;
  text-align: justify;
}

/* ══════════════════════════════════════
   RESEARCH AREAS
══════════════════════════════════════ */
.research-areas {
  padding: 70px 24px;
  background: var(--bg-cream);
}

.research-areas .heading {
  text-align: center;
  margin-bottom: 48px;
}

.research-areas .heading h2 {
  display: inline-block;
  font-size: 2rem;
  color: var(--primary-navy);
  font-weight: 800;
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--accent-gold);
}

.research-areas .heading p {
  color: var(--text-muted);
  font-size: 0.97rem;
  margin-top: 16px;
}

.research-grid {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.research-card {
  background: #fff;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
  border: 1px solid var(--border-soft);
  position: relative;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
}

/* Top accent bar on hover */
.research-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-gold), var(--accent-orange));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.research-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-medium);
}

.research-card:hover::before { transform: scaleX(1); }

/* Image wrap */
.research-card .img-wrap {
  height: 170px;
  background: linear-gradient(135deg, #e8f0f7 0%, #f5e9d4 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
  overflow: hidden;
}

.research-card .img-wrap img {
  max-height: 120px;
  width: auto;
  object-fit: contain;
  transition: transform 0.45s ease;
}
.research-card:hover .img-wrap img { transform: scale(1.08); }

/* Card body */
.research-card .body {
  padding: 22px;
  text-align: center;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.research-card h3 {
  font-size: 1.05rem;
  color: var(--primary-navy);
  font-weight: 700;
}

.research-card p {
  font-size: 0.83rem;
  color: var(--text-muted);
  line-height: 1.6;
  flex: 1;
}

.research-card .explore {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  color: var(--accent-orange);
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.03em;
  margin-top: 4px;
}

.research-card .explore .arrow {
  transition: transform var(--transition);
  display: inline-block;
}
.research-card:hover .explore .arrow { transform: translateX(4px); }

/* ══════════════════════════════════════
   MISSION STRIP
══════════════════════════════════════ */
.mission-strip {
  background: linear-gradient(135deg, var(--primary-navy) 0%, var(--primary-blue) 100%);
  color: #fff;
  padding: 64px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.mission-strip::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(201,169,97,0.14) 0%, transparent 70%);
  pointer-events: none;
}

.mission-strip .content {
  max-width: 820px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.mission-strip h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 18px;
  color: var(--accent-gold);
}

.mission-strip p {
  font-size: 1.05rem;
  line-height: 1.82;
  color: #d8e4f0;
}

/* ══════════════════════════════════════
   REVEAL ANIMATION
══════════════════════════════════════ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ══════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════ */
@media (max-width: 900px) {
  .hero h1             { font-size: 2.2rem; }
  .hero .tagline       { font-size: 1rem; }
  .hero .acronym-explainer { font-size: 0.92rem; }
  .stats-grid          { grid-template-columns: repeat(2, 1fr); }
  .director-card       { grid-template-columns: 1fr; }
  .director-card .img-side { flex-direction: row; padding: 28px; gap: 20px; }
  .director-card .img-side::after { display: none; }
  .director-card .img-side img { width: 110px; height: 130px; }
  .research-grid       { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .hero                { min-height: 70vh; padding: 56px 18px 48px; }
  .hero h1             { font-size: 1.7rem; letter-spacing: 0; }
  .hero .badge         { font-size: 0.68rem; padding: 6px 14px; }
  .hero-cta            { flex-direction: column; align-items: stretch; }
  .btn                 { text-align: center; justify-content: center; padding: 13px 20px; }
  .stats-grid          { grid-template-columns: 1fr 1fr; gap: 16px; }
  .stat-item .number   { font-size: 2rem; }
  .director-card .img-side { flex-direction: column; }
  .director-card .info-side { padding: 24px 18px; }
  .research-grid       { grid-template-columns: 1fr; }
  .mission-strip h2    { font-size: 1.5rem; }
  .mission-strip p     { font-size: 0.93rem; }
}

@media (max-width: 420px) {
  .hero h1             { font-size: 1.45rem; }
  .stats-grid          { grid-template-columns: 1fr 1fr; }
}