/* =======================================
   EV Battery Health & Diagnostics
   Main Stylesheet
   ======================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&family=Sora:wght@400;500;600;700;800&display=swap');

/* ---- CSS Variables ---- */
:root {
  /* Color System */
  --bg-primary: #020a07;
  --bg-secondary: #05140e;
  --bg-card: #081f15;
  --bg-card-hover: #0c2b1e;
  --bg-glass: rgba(11, 48, 31, 0.85);

  --accent-blue: #16a34a;
  --accent-blue-glow: rgba(22, 163, 74, 0.25);
  --accent-cyan: #22c55e;
  --accent-teal: #10b981;

  /* Battery Health State Gradients */
  --health-good: #22C55E;
  --health-fair: #FACC15;
  --health-warn: #F97316;
  --health-crit: #EF4444;

  /* Typography Colors */
  --text-primary: #E6EDF3;
  --text-secondary: #9FB3C8;
  --text-muted: #7A8FA6;

  /* UI Elements */
  --border-subtle: rgba(34, 197, 94, 0.15);
  --border-card: rgba(34, 197, 94, 0.2);

  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.4), 0 0 20px rgba(34, 197, 94, 0.15);
  --shadow-glow: 0 0 40px rgba(34, 197, 94, 0.15);

  --nav-height: 72px;
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Layout Spacing */
  --section-pad-desktop: 120px;
  --section-pad-mobile: 80px;
}

[data-theme="light"] {
  --bg-primary: #F8FAFC;
  --bg-secondary: #F1F5F9;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F8FAFC;
  --bg-glass: rgba(255,255,255,0.93);
  --text-primary: #0F172A;
  --text-secondary: #334155;
  --text-muted: #64748B;
  --border-subtle: rgba(34, 197, 94, 0.2);
  --border-card: rgba(29, 161, 242, 0.3);
  --shadow-card: 0 4px 24px rgba(29, 161, 242, 0.08);
  --shadow-hover: 0 12px 32px rgba(29, 161, 242, 0.15), 0 0 20px rgba(45, 212, 191, 0.1);
}

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Inter', sans-serif;
  font-size: 1.125rem;
  background: radial-gradient(circle at center top, #061c13 0%, var(--bg-primary) 100%);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background 0.4s, color 0.4s;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
h1, h2, h3, h4, h5, h6, .nav-logo-title, .nav-link, .btn, .card-title, .section-title {
  font-family: 'Inter', sans-serif;
  letter-spacing: -0.02em;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent-blue); border-radius: 3px; }

/* ---- Utility ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section-pad { padding: var(--section-pad-desktop) 0; }
.text-blue { color: var(--accent-blue); }
.text-teal { color: var(--accent-teal); }
.text-green { color: var(--accent-green); }
.text-orange { color: var(--accent-orange); }
.mono { font-family: 'JetBrains Mono', monospace; font-size: 0.82em; }

.section-label {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.85rem; font-weight: 700; letter-spacing: 3px;
  text-transform: uppercase; color: var(--accent-cyan);
  background: rgba(45, 212, 191, 0.1); border: 1px solid rgba(45, 212, 191, 0.25);
  border-radius: 100px; padding: 6px 16px; margin-bottom: 20px;
}
.section-label::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--accent-cyan); animation: pulse-dot 1.5s infinite; }

.section-title {
  font-size: clamp(2rem, 4vw, 2.5rem); /* 32px to 40px */
  font-weight: 800;
  line-height: 1.2; margin-bottom: 20px; color: var(--text-primary);
  letter-spacing: -0.03em;
}
.section-title span { color: var(--accent-blue); }
.section-desc { font-size: 1.125rem; color: var(--text-secondary); max-width: 750px; line-height: 1.7; margin-bottom: 40px; }
.section-header { margin-bottom: 64px; }
.section-header.center { text-align: center; }
.section-header.center .section-desc { margin-left: auto; margin-right: auto; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font-size: 1rem; font-weight: 600; border: none; cursor: pointer;
  border-radius: 8px; padding: 14px 26px; transition: var(--transition);
  position: relative; overflow: hidden;
}
.btn::after {
  content: ''; position: absolute; inset: 0;
  background: rgba(255,255,255,0.1); opacity: 0; transition: opacity 0.3s;
}
.btn:hover::after { opacity: 1; }
.btn-primary {
  background: var(--accent-cyan);
  color: #020a07; font-weight: 700;
  box-shadow: 0 4px 12px rgba(34, 197, 94, 0.2);
}
.btn-primary:hover { 
  background: var(--accent-teal);
  transform: translateY(-2px); 
  box-shadow: 0 6px 20px rgba(34, 197, 94, 0.3); 
}
.btn-outline {
  background: transparent; color: var(--accent-cyan);
  border: 1.5px solid var(--accent-cyan);
}
.btn-outline:hover { 
  background: rgba(45, 212, 191, 0.1); 
  transform: translateY(-2px) scale(1.02); 
  box-shadow: 0 8px 20px rgba(45, 212, 191, 0.15); 
}
.btn-orange {
  background: var(--accent-cyan);
  color: #020a07; font-weight: 700;
  box-shadow: 0 4px 12px rgba(34, 197, 94, 0.2);
}
.btn-orange:hover { background: var(--accent-teal); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(34, 197, 94, 0.3); }

/* ---- Navbar ---- */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-height); display: flex; align-items: center;
  background: rgba(7, 27, 43, 0.85);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition);
}
[data-theme="light"] .navbar { background: rgba(248,250,252,0.9); }
.navbar.scrolled { box-shadow: 0 4px 32px rgba(0,0,0,0.3); }
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; max-width: 1280px; margin: 0 auto; padding: 0 24px;
}
.nav-logo { display: flex; align-items: center; gap: 14px; }
.nav-logo-icon {
  width: 44px; height: 44px; border-radius: 12px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-teal));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; font-weight: 900; color: #fff;
  box-shadow: 0 4px 16px rgba(22, 163, 74, 0.3);
}
.nav-logo-text { display: flex; flex-direction: column; line-height: 1.15; }
.nav-logo-title {
  font-family: 'Sora', sans-serif;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: 1px;
}
.logo-battery { color: #f97316; }
.logo-ev { color: #22c55e; }
.logo-engineer { color: #0ea5e9; }
.logo-dot { color: #071b2b !important; } /* Matches navbar background in dark mode */
[data-theme="light"] .logo-dot { color: #cbd5e1 !important; } /* Subtle indicator in light mode */
.nav-logo-sub { font-family: 'Inter', sans-serif; font-size: 0.75rem; color: var(--text-muted); font-weight: 500; margin-top: 4px; line-height: 1.3; }
.nav-links {
  display: flex; align-items: center; gap: 4px;
}
.nav-link {
  font-size: 0.95rem; font-weight: 500; color: var(--text-secondary);
  padding: 8px 14px; border-radius: 8px; transition: var(--transition);
  white-space: nowrap; position: relative;
}
.nav-link::after {
  content: ''; position: absolute; bottom: 4px; left: 12px; right: 12px; height: 2px;
  background: var(--accent-cyan); transform: scaleX(0); transition: transform 0.3s ease;
}
.nav-link:hover { color: var(--text-primary); }
.nav-link:hover::after { transform: scaleX(1); }

/* Dropdown Menu */
.nav-dropdown { position: relative; display: flex; align-items: center; }
.dropdown-menu {
  position: absolute; top: 100%; left: 0; min-width: 180px;
  background: var(--bg-card); border: 1px solid var(--border-subtle);
  border-radius: 12px; padding: 8px; margin-top: 4px;
  box-shadow: var(--shadow-card); opacity: 0; visibility: hidden;
  transform: translateY(10px); transition: var(--transition);
  z-index: 100; display: flex; flex-direction: column; gap: 4px;
}
.nav-dropdown:hover .dropdown-menu {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.dropdown-item {
  display: block; padding: 10px 14px; color: var(--text-secondary);
  font-size: 0.88rem; font-weight: 500; border-radius: 8px;
  transition: var(--transition); text-decoration: none;
}
.dropdown-item:hover {
  background: rgba(34, 197, 94, 0.1); color: var(--accent-cyan);
}
.nav-actions { display: flex; align-items: center; gap: 14px; }
.theme-toggle {
  width: 38px; height: 38px; border-radius: 50%; border: 1.5px solid var(--border-card);
  background: var(--bg-card); cursor: pointer; display: flex; align-items: center;
  justify-content: center; font-size: 1rem; transition: var(--transition); color: var(--text-primary);
}
.theme-toggle:hover { border-color: var(--accent-blue); background: rgba(14,165,233,0.1); }
.hamburger {
  display: none; flex-direction: column; gap: 5px; cursor: pointer;
  width: 38px; height: 38px; align-items: center; justify-content: center;
  background: var(--bg-card); border: 1px solid var(--border-subtle); border-radius: 8px;
  position: relative; z-index: 1002;
}
.hamburger span { width: 20px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: var(--transition); }
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(2, 10, 7, 0.98); backdrop-filter: blur(20px);
  z-index: 1001; padding: 100px 32px 40px;
  flex-direction: column; gap: 12px; overflow-y: auto;
  transform: translateX(100%); transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}
.mobile-menu.open { transform: translateX(0); }
.mobile-menu.visible { display: flex; }
.mobile-link {
  font-size: 1.25rem; font-weight: 600; color: var(--text-primary);
  padding: 16px 20px; border-radius: 12px; border: 1px solid rgba(255,255,255,0.05);
  transition: var(--transition); text-decoration: none;
  display: flex; align-items: center; gap: 12px;
}
.mobile-link:hover { color: var(--accent-cyan); border-color: var(--accent-cyan); background: rgba(34, 197, 94, 0.05); }

/* ---- Hero ---- */
.hero {
  min-height: 100vh; display: flex; align-items: center; position: relative;
  overflow: hidden; padding-top: var(--nav-height);
  background: radial-gradient(ellipse 80% 70% at 50% -10%, rgba(14,165,233,0.12) 0%, transparent 70%),
              radial-gradient(ellipse 50% 50% at 80% 60%, rgba(20,184,166,0.07) 0%, transparent 60%),
              var(--bg-primary);
}
.hero-grid-bg {
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(14,165,233,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14,165,233,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}
.hero-inner {
  display: grid; grid-template-columns: 1fr 1fr; gap: 64px;
  align-items: center; padding: 80px 0; position: relative; z-index: 1;
}
.hero-label {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.72rem; font-weight: 600; letter-spacing: 2.5px; text-transform: uppercase;
  color: var(--accent-teal); background: rgba(20,184,166,0.1);
  border: 1px solid rgba(20,184,166,0.25); border-radius: 100px; padding: 6px 16px;
  margin-bottom: 20px;
}
.hero-label-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent-teal); animation: pulse-dot 1.5s infinite; }
.hero-title {
  font-family: 'Inter', sans-serif;
  font-size: clamp(2.8rem, 6vw, 5.5rem); 
  font-weight: 800; line-height: 1.05; margin-bottom: 24px; letter-spacing: -0.04em;
}
.text-ev-battery { color: #22c55e; display: inline-block; margin-bottom: 2px; }
.text-health { color: #0ea5e9; }
.text-ampersand { color: #ffffff; }
.text-diagnostics {
  background: linear-gradient(90deg, #facc15, #f97316, #ef4444);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-subtitle {
  font-size: 1.05rem; font-weight: 600; color: var(--text-secondary);
  margin-bottom: 16px; line-height: 1.5;
}
.hero-desc { font-size: 1.125rem; font-weight: 400; color: var(--text-secondary); line-height: 1.7; margin-bottom: 28px; max-width: 600px; }
.hero-chips { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 36px; }
.hero-chip {
  font-size: 0.8125rem; font-weight: 600; padding: 7px 14px; border-radius: 100px;
  border: 1px solid var(--border-card); color: var(--accent-blue);
  background: rgba(29, 161, 242, 0.08); letter-spacing: 0.3px;
  transition: var(--transition);
}
.hero-chip:hover { background: rgba(29, 161, 242, 0.18); border-color: var(--accent-blue); }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }

/* Hero Visual */
.hero-visual { position: relative; display: flex; align-items: center; justify-content: center; }
.battery-viz {
  width: 100%; max-width: 480px; aspect-ratio: 1;
  position: relative; display: flex; align-items: center; justify-content: center;
}
.battery-ring {
  position: absolute; border-radius: 50%; border: 1px solid transparent;
  animation: rotate-ring 12s linear infinite;
}
.ring-1 { width: 85%; height: 85%; border-color: rgba(14,165,233,0.2); animation-duration: 20s; }
.ring-2 { width: 68%; height: 68%; border-color: rgba(20,184,166,0.15); animation-direction: reverse; animation-duration: 15s; }
.ring-3 { width: 52%; height: 52%; border-color: rgba(34,211,165,0.1); animation-duration: 10s; }
.battery-core {
  width: 200px; height: 200px; border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, rgba(14,165,233,0.3), rgba(14,165,233,0.05) 60%, transparent 80%);
  border: 2px solid rgba(14,165,233,0.35);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 60px rgba(14,165,233,0.2), inset 0 0 40px rgba(14,165,233,0.05);
  position: relative; z-index: 2;
}
.battery-icon-svg { width: 80px; height: 80px; }
.battery-pulse {
  position: absolute; width: 200px; height: 200px; border-radius: 50%;
  border: 2px solid rgba(14,165,233,0.5);
  animation: pulse-expand 2.5s ease-out infinite;
}
.battery-pulse:nth-child(2) { animation-delay: 0.8s; }
.battery-pulse:nth-child(3) { animation-delay: 1.6s; }
.data-nodes {
  position: absolute; inset: 0; pointer-events: none;
}
.data-node {
  position: absolute; width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent-blue); box-shadow: 0 0 8px var(--accent-blue);
  animation: node-blink 3s ease-in-out infinite;
}
.data-node:nth-child(1) { top: 12%; left: 50%; animation-delay: 0s; }
.data-node:nth-child(2) { top: 50%; right: 8%; animation-delay: 0.6s; background: var(--accent-teal); box-shadow: 0 0 8px var(--accent-teal); }
.data-node:nth-child(3) { bottom: 12%; left: 50%; animation-delay: 1.2s; background: var(--accent-green); box-shadow: 0 0 8px var(--accent-green); }
.data-node:nth-child(4) { top: 50%; left: 8%; animation-delay: 1.8s; }
.data-node:nth-child(5) { top: 25%; right: 18%; animation-delay: 0.9s; background: var(--accent-orange); box-shadow: 0 0 8px var(--accent-orange); }

/* ---- Metrics Strip ---- */
.metrics-strip {
  padding: 0 0 80px;
  background: var(--bg-primary);
}
.metrics-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
  background: var(--bg-secondary); border-radius: 20px;
  border: 1px solid var(--border-subtle); padding: 32px;
  box-shadow: var(--shadow-glow);
}
.metric-card {
  display: flex; flex-direction: column; align-items: center; text-align: center;
  padding: 20px 12px; border-radius: 14px; border: 1px solid transparent;
  transition: var(--transition);
}
.metric-card:hover { border-color: var(--border-card); background: var(--bg-card); }
.metric-icon { font-size: 2rem; margin-bottom: 12px; }
.metric-value { font-size: 1.4rem; font-weight: 900; color: var(--accent-blue); line-height: 1; margin-bottom: 6px; }
.metric-label { font-size: 0.8rem; color: var(--text-secondary); font-weight: 500; }

/* ---- Cards Base ---- */
.card {
  background: var(--bg-card); border: 1px solid var(--border-card);
  border-radius: var(--radius-lg); padding: 24px 28px; position: relative;
  overflow: hidden; transition: var(--transition);
  box-shadow: var(--shadow-card);
}
.card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  border-radius: inherit; border: 1px solid transparent;
  background: linear-gradient(135deg, var(--accent-cyan), transparent) border-box;
  -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: destination-out; mask-composite: exclude;
  opacity: 0; transition: opacity 0.3s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.card:hover::before { opacity: 1; }
.card-icon { font-size: 2rem; margin-bottom: 16px; display: block; }
.card-title { font-size: 1.375rem; /* 22px */ font-weight: 700; margin-bottom: 10px; color: var(--text-primary); }
.card-desc { font-size: 1.125rem; /* 18px */ color: var(--text-secondary); line-height: 1.7; }

/* ---- About Section ---- */
.about-section { background: var(--bg-secondary); }
.researchers-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.researcher-card {
  background: var(--bg-card); border: 1px solid var(--border-card);
  border-radius: 20px; padding: 48px; display: flex; flex-direction: column;
  gap: 24px; transition: var(--transition); position: relative; overflow: hidden;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}
.researcher-card::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-teal));
  opacity: 0; transition: opacity 0.3s;
}
.researcher-card:hover { transform: translateY(-4px); border-color: rgba(34,197,94,0.4); }
.researcher-card:hover::after { opacity: 1; }
.researcher-header { display: flex; gap: 24px; align-items: flex-start; }
.researcher-photo {
  width: 110px; height: 110px; border-radius: 50%; object-fit: cover; object-position: top;
  border: 4px solid var(--accent-blue); box-shadow: 0 0 24px rgba(34,197,94,0.25); flex-shrink: 0;
}
.researcher-info { flex: 1; }
.researcher-name { font-size: 1.4rem; font-weight: 800; color: var(--text-primary); margin-bottom: 4px; }
.researcher-role { font-size: 0.95rem; color: var(--accent-blue); font-weight: 700; margin-bottom: 12px; }
.researcher-inst { font-size: 0.95rem; color: #5a6b7e; line-height: 1.4; margin-bottom: 20px; }
.inst-primary { font-size: 0.95rem; color: #7dd3fc; font-weight: 600; display: block; margin-bottom: 1px; }
.researcher-badges { display: flex; gap: 8px; flex-wrap: wrap; }
.researcher-badge {
  display: inline-flex; font-size: 0.75rem; font-weight: 700;
  padding: 6px 16px; border-radius: 100px;
  background: rgba(34,197,94,0.1); color: var(--accent-cyan); border: 1px solid rgba(34,197,94,0.25);
}
.badge-blue {
  background: rgba(14,165,233,0.1); color: #0ea5e9; border-color: rgba(14,165,233,0.25);
}
.researcher-focus { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.6; border-bottom: 0px solid transparent; padding-bottom: 0; }
.researcher-focus strong { color: var(--accent-cyan); font-weight: 600; }
.researcher-contacts { display: flex; flex-direction: column; gap: 16px; margin-top: 8px; }
.contact-link {
  display: inline-flex; align-items: center; gap: 12px; font-size: 0.88rem; font-weight: 500;
  color: var(--text-secondary); transition: var(--transition); text-decoration: none;
}
.contact-link span { filter: grayscale(1) opacity(0.6); font-size: 1.1rem; }
.contact-link:hover { color: var(--text-primary); }
.contact-link:hover span { filter: none; }

/* ---- Vision Section ---- */
.vision-section { background: var(--bg-primary); }
.vision-desc-block {
  background: var(--bg-card); border: 1px solid var(--border-card);
  border-radius: 20px; padding: 36px; margin-bottom: 40px;
  position: relative; overflow: hidden; max-width: 900px; margin-left: auto; margin-right: auto;
  box-shadow: var(--shadow-card);
}
.vision-desc-block::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: linear-gradient(to bottom, var(--accent-blue), var(--accent-cyan));
}
.vision-desc-block p { font-size: 1.125rem; color: var(--text-secondary); line-height: 1.7; padding-left: 8px; }
.vision-cards { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.vision-card {
  background: var(--bg-card); border: 1px solid var(--border-card);
  border-radius: 20px; padding: 32px 28px; text-align: center;
  transition: var(--transition); position: relative; overflow: hidden;
}
.vision-card:hover { transform: translateY(-4px); border-color: rgba(14,165,233,0.4); }
.vision-icon { font-size: 2.4rem; margin-bottom: 16px; }
.vision-title { font-size: 1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.vision-text { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.7; }

/* ---- R&D Cards ---- */
.rnd-section { background: var(--bg-secondary); }
.rnd-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

/* ---- Pipeline Section ---- */
.pipeline-section { background: var(--bg-primary); }
.pipeline-flow {
  display: grid; grid-template-columns: repeat(6, 1fr);
  gap: 0; position: relative; align-items: stretch;
}
.pipeline-flow::before {
  content: ''; position: absolute; top: 42px; left: 5%; right: 5%; height: 2px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-teal), var(--accent-green));
  z-index: 0;
}
.pipeline-step {
  display: flex; flex-direction: column; align-items: center; text-align: center;
  padding: 0 8px; position: relative; z-index: 1; height: 100%;
}
.pipeline-num {
  width: 56px; height: 56px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-teal));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; font-weight: 900; color: #fff; margin-bottom: 16px;
  box-shadow: 0 0 20px rgba(14,165,233,0.4); position: relative; z-index: 2;
}
.pipeline-card {
  background: var(--bg-card); border: 1px solid var(--border-card);
  border-radius: 14px; padding: 20px 14px; width: 100%; flex: 1;
  transition: var(--transition);
}
.pipeline-card:hover { border-color: rgba(14,165,233,0.4); transform: translateY(-3px); }
.pipeline-card-title { font-size: 0.88rem; font-weight: 700; color: var(--accent-blue); margin-bottom: 8px; }
.pipeline-card-desc { font-size: 0.75rem; color: var(--text-muted); line-height: 1.6; }

/* ---- Degradation Section ---- */
.degradation-section { background: var(--bg-secondary); }
.degradation-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.deg-card {
  background: var(--bg-card); border: 1px solid var(--border-card);
  border-radius: 14px; padding: 20px 16px; transition: var(--transition);
  cursor: pointer; position: relative; overflow: hidden;
}
.deg-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
  transform: scaleX(0); transition: transform 0.3s;
}
.deg-card:hover { transform: translateY(-3px); border-color: rgba(14,165,233,0.4); }
.deg-card:hover::before { transform: scaleX(1); }
.deg-icon { font-size: 1.6rem; margin-bottom: 10px; }
.deg-title { font-size: 0.83rem; font-weight: 700; color: var(--text-primary); margin-bottom: 6px; }
.deg-desc { font-size: 0.75rem; color: var(--text-muted); line-height: 1.6; }
.deg-tag {
  display: inline-block; font-size: 0.65rem; font-weight: 600;
  padding: 3px 8px; border-radius: 4px; background: rgba(14,165,233,0.1);
  color: var(--accent-blue); margin-top: 8px; font-family: 'JetBrains Mono', monospace;
}

/* ---- Battery Health Monitoring ---- */
.health-section { background: var(--bg-primary); }
.health-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.health-tile {
  background: var(--bg-card); border: 1px solid var(--border-card);
  border-radius: 16px; padding: 24px 20px; transition: var(--transition); position: relative;
}
.health-tile-accent {
  width: 40px; height: 4px; border-radius: 2px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-teal));
  margin-bottom: 14px;
}
.health-tile-title { font-size: 0.9rem; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.health-tile-abbr {
  font-family: 'JetBrains Mono', monospace; font-size: 0.8rem;
  color: var(--accent-blue); font-weight: 600; margin-bottom: 10px;
  background: rgba(14,165,233,0.08); border-radius: 6px; padding: 3px 8px; display: inline-block;
}
.health-tile-desc { font-size: 0.8rem; color: var(--text-muted); line-height: 1.65; }
.health-tile:hover { transform: translateY(-3px); border-color: rgba(14,165,233,0.4); box-shadow: 0 8px 24px rgba(0,0,0,0.2); }

/* ---- AI/ML Section ---- */
.aiml-section { background: var(--bg-secondary); }
.aiml-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 40px; }
.featured-project {
  background: linear-gradient(135deg, rgba(14,165,233,0.12), rgba(20,184,166,0.08));
  border: 1px solid rgba(14,165,233,0.35); border-radius: 24px; padding: 40px;
  display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: center;
  position: relative; overflow: hidden;
}
.featured-project::before {
  content: ''; position: absolute; top: -60px; right: -60px;
  width: 200px; height: 200px; border-radius: 50%;
  background: radial-gradient(circle, rgba(14,165,233,0.15), transparent 70%);
}
.featured-label {
  font-size: 0.7rem; font-weight: 700; letter-spacing: 2px; text-transform: uppercase;
  color: var(--accent-orange); background: rgba(249,115,22,0.12);
  border: 1px solid rgba(249,115,22,0.3); border-radius: 100px; padding: 5px 14px;
  display: inline-block; margin-bottom: 14px;
}
.featured-title { font-size: 1.5rem; font-weight: 800; margin-bottom: 12px; line-height: 1.3; }
.featured-desc { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.75; margin-bottom: 20px; }
.featured-visual {
  width: 120px; height: 120px; border-radius: 50%;
  background: radial-gradient(circle, rgba(14,165,233,0.3), rgba(14,165,233,0.05));
  border: 2px solid rgba(14,165,233,0.4); display: flex; align-items: center;
  justify-content: center; font-size: 3rem; flex-shrink: 0;
  box-shadow: 0 0 40px rgba(14,165,233,0.2);
  animation: pulse-glow 3s ease-in-out infinite;
}

/* ---- Technology Platforms ---- */
.tech-section { background: var(--bg-primary); }
.tech-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.tech-card {
  background: var(--bg-card); border: 1px solid var(--border-card);
  border-radius: 20px; padding: 32px; transition: var(--transition);
  display: flex; gap: 20px; align-items: flex-start;
  box-shadow: var(--shadow-card); position: relative; overflow: hidden;
}
.tech-card:hover { transform: translateY(-4px); border-color: rgba(14,165,233,0.4); }
.tech-card-icon-wrap {
  width: 56px; height: 56px; border-radius: 14px; flex-shrink: 0;
  background: linear-gradient(135deg, rgba(14,165,233,0.2), rgba(20,184,166,0.2));
  border: 1px solid var(--border-card); display: flex; align-items: center;
  justify-content: center; font-size: 1.6rem;
}
.tech-card-body { flex: 1; }
.tech-card-title { font-size: 1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.tech-card-desc { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.7; }
.tech-tag {
  display: inline-block; font-size: 0.7rem; font-weight: 600;
  padding: 4px 10px; border-radius: 6px; margin-top: 12px; margin-right: 6px;
  background: rgba(14,165,233,0.1); color: var(--accent-blue);
  border: 1px solid rgba(14,165,233,0.2); font-family: 'JetBrains Mono', monospace;
}

/* ---- Industry Applications ---- */
.industry-section { background: var(--bg-secondary); }
.industry-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.industry-card {
  background: var(--bg-card); border: 1px solid var(--border-card);
  border-radius: 18px; padding: 28px; transition: var(--transition);
}
.industry-card:hover { transform: translateY(-4px); border-color: rgba(14,165,233,0.4); }
.industry-icon { font-size: 2rem; margin-bottom: 14px; }
.industry-title { font-size: 0.95rem; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.industry-desc { font-size: 0.83rem; color: var(--text-secondary); line-height: 1.7; }
.industry-value {
  margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--border-subtle);
  font-size: 0.78rem; color: var(--accent-teal); font-weight: 600;
}

/* ---- Why This Matters ---- */
.why-section { background: var(--bg-primary); }
.why-inner {
  display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center;
}
.why-visual {
  background: var(--bg-card); border: 1px solid var(--border-card);
  border-radius: 24px; padding: 40px; text-align: center; position: relative; overflow: hidden;
}
.why-visual::before {
  content: ''; position: absolute; top: -40px; right: -40px;
  width: 180px; height: 180px; border-radius: 50%;
  background: radial-gradient(circle, rgba(14,165,233,0.12), transparent 70%);
}
.why-big-icon { font-size: 4rem; margin-bottom: 16px; }
.why-stat { font-size: 2.5rem; font-weight: 900; color: var(--accent-blue); line-height: 1; margin-bottom: 4px; }
.why-stat-label { font-size: 0.85rem; color: var(--text-muted); }
.why-stats-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 24px; }
.why-stat-item { padding: 16px; background: var(--bg-secondary); border-radius: 12px; text-align: center; }
.why-points { display: flex; flex-direction: column; gap: 16px; }
.why-point {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 20px; background: var(--bg-card); border: 1px solid var(--border-subtle);
  border-radius: 14px; transition: var(--transition);
}
.why-point:hover { border-color: var(--border-card); transform: translateX(4px); }
.why-point-icon { font-size: 1.4rem; flex-shrink: 0; margin-top: 2px; }
.why-point-title { font-size: 0.9rem; font-weight: 700; color: var(--text-primary); margin-bottom: 4px; }
.why-point-desc { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.6; }

/* ---- Publications ---- */
.pubs-section { background: var(--bg-secondary); }
.pubs-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.pub-card {
  background: var(--bg-card); border: 1px solid var(--border-card);
  border-radius: 18px; padding: 28px; transition: var(--transition);
}
.pub-card:hover { transform: translateY(-3px); border-color: rgba(14,165,233,0.4); }
.pub-card-type {
  font-size: 0.7rem; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase;
  padding: 4px 12px; border-radius: 100px; margin-bottom: 14px; display: inline-block;
}
.type-paper { background: rgba(14,165,233,0.12); color: var(--accent-blue); border: 1px solid rgba(14,165,233,0.2); }
.type-patent { background: rgba(249,115,22,0.12); color: var(--accent-orange); border: 1px solid rgba(249,115,22,0.2); }
.type-report { background: rgba(20,184,166,0.12); color: var(--accent-teal); border: 1px solid rgba(20,184,166,0.2); }
.type-dataset { background: rgba(139,92,246,0.12); color: var(--accent-purple); border: 1px solid rgba(139,92,246,0.2); }
.type-innovation { background: rgba(34,211,165,0.12); color: var(--accent-green); border: 1px solid rgba(34,211,165,0.2); }
.type-roadmap { background: rgba(249,115,22,0.12); color: var(--accent-orange); border: 1px solid rgba(249,115,22,0.2); }
.pub-icon { font-size: 1.8rem; margin-bottom: 12px; }
.pub-title { font-size: 0.9rem; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.pub-desc { font-size: 0.8rem; color: var(--text-muted); line-height: 1.6; }

/* ---- Skills ---- */
.skills-section { background: var(--bg-primary); }
.skills-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.skill-group {
  background: var(--bg-card); border: 1px solid var(--border-card);
  border-radius: 20px; padding: 32px; transition: var(--transition);
}
.skill-group:hover { border-color: rgba(14,165,233,0.4); }
.skill-group-header { display: flex; align-items: center; gap: 14px; margin-bottom: 24px; }
.skill-group-icon { font-size: 1.8rem; }
.skill-group-title { font-size: 1rem; font-weight: 700; color: var(--text-primary); }
.skill-items { display: flex; flex-direction: column; gap: 12px; }
.skill-item { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.skill-name { font-size: 0.85rem; color: var(--text-secondary); font-weight: 500; min-width: 140px; }
.skill-bar { flex: 1; height: 6px; background: var(--bg-secondary); border-radius: 3px; overflow: hidden; }
.skill-fill { height: 100%; border-radius: 3px; background: linear-gradient(90deg, var(--accent-blue), var(--accent-teal)); }

/* ---- Degradation Atlas ---- */
.atlas-section { background: var(--bg-secondary); }
.atlas-intro { font-size: 1.125rem; color: var(--text-secondary); margin-bottom: 40px; line-height: 1.8; max-width: 800px; }
.atlas-rows { display: flex; flex-direction: column; gap: 16px; }
.atlas-row { display: grid; grid-template-columns: 180px 1fr; gap: 0; border-radius: 16px; overflow: hidden; border: 1px solid var(--border-card); }
.atlas-stage {
  padding: 24px 20px; display: flex; flex-direction: column; justify-content: center;
  font-weight: 700; font-size: 0.85rem;
}
.atlas-stage.early { background: linear-gradient(135deg, rgba(34,197,94,0.15), rgba(34,197,94,0.05)); color: var(--health-good); }
.atlas-stage.mid { background: linear-gradient(135deg, rgba(250,204,21,0.15), rgba(250,204,21,0.05)); color: var(--health-fair); }
.atlas-stage.advanced { background: linear-gradient(135deg, rgba(249,115,22,0.15), rgba(249,115,22,0.05)); color: var(--health-warn); }
.atlas-stage.critical { background: linear-gradient(135deg, rgba(239,68,68,0.15), rgba(239,68,68,0.05)); color: var(--health-crit); }
.atlas-stage-label { font-size: 0.75rem; font-weight: 600; opacity: 0.7; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 4px; }
.atlas-stage-name { font-size: 0.95rem; font-weight: 800; }
.atlas-indicators {
  background: var(--bg-card); padding: 20px 24px;
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
}
.atlas-indicator {
  display: flex; align-items: center; gap: 8px; font-size: 0.78rem;
  background: var(--bg-secondary); border: 1px solid var(--border-subtle);
  border-radius: 8px; padding: 6px 12px; color: var(--text-secondary);
}
.atlas-indicator-dot { width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; }

/* ---- Collaboration ---- */
.collab-section {
  background: linear-gradient(135deg, rgba(14,165,233,0.08), rgba(20,184,166,0.05));
  border-top: 1px solid var(--border-subtle); border-bottom: 1px solid var(--border-subtle);
}
.collab-inner { text-align: center; max-width: 700px; margin: 0 auto; }
.collab-orgs { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin: 32px 0; }
.collab-org {
  font-size: 0.8rem; font-weight: 600; padding: 8px 18px; border-radius: 100px;
  border: 1px solid var(--border-card); color: var(--text-secondary); background: var(--bg-card);
  transition: var(--transition);
}
.collab-org:hover { border-color: var(--accent-blue); color: var(--accent-blue); background: rgba(14,165,233,0.08); }

/* ---- Contact Section ---- */
.contact-section { background: var(--bg-primary); }
.contact-inner { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; align-items: start; }
.contact-info-title { font-size: 1.3rem; font-weight: 700; margin-bottom: 8px; }
.contact-info-desc { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.75; margin-bottom: 28px; }
.contact-people { display: flex; flex-direction: column; gap: 20px; }
.contact-person {
  background: var(--bg-card); border: 1px solid var(--border-card);
  border-radius: 16px; padding: 20px;
}
.contact-person-name { font-size: 0.95rem; font-weight: 700; color: var(--text-primary); margin-bottom: 4px; }
.contact-person-role { font-size: 0.78rem; color: var(--accent-blue); margin-bottom: 12px; font-weight: 600; }
.contact-detail { display: flex; align-items: center; gap: 10px; font-size: 0.8rem; color: var(--text-muted); margin-bottom: 6px; }
.contact-detail a { color: var(--text-muted); transition: color 0.2s; }
.contact-detail a:hover { color: var(--accent-blue); }
.contact-form {
  background: var(--bg-card); border: 1px solid var(--border-card);
  border-radius: 20px; padding: 36px;
}
.form-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 24px; }
.form-group { margin-bottom: 18px; }
.form-label { display: block; font-size: 0.8rem; font-weight: 600; color: var(--text-secondary); margin-bottom: 8px; letter-spacing: 0.3px; }
.form-input, .form-select, .form-textarea {
  width: 100%; padding: 13px 16px; border-radius: 10px; font-size: 0.88rem; font-family: 'Inter', sans-serif;
  background: var(--bg-secondary); border: 1.5px solid var(--border-subtle);
  color: var(--text-primary); transition: var(--transition); outline: none;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--accent-blue); box-shadow: 0 0 0 3px rgba(14,165,233,0.12);
}
.form-textarea { resize: vertical; min-height: 120px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ---- Footer ---- */
.footer {
  background: var(--bg-secondary); border-top: 1px solid var(--border-subtle);
  padding: 64px 0 32px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand-desc { font-size: 0.83rem; color: var(--text-muted); line-height: 1.75; margin-top: 14px; }
.footer-heading { font-size: 0.78rem; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: var(--accent-blue); margin-bottom: 16px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-link { font-size: 0.83rem; color: var(--text-muted); transition: color 0.2s; }
.footer-link:hover { color: var(--accent-blue); }
.footer-socials { display: flex; gap: 10px; margin-top: 16px; }
.social-btn {
  width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--border-card);
  background: var(--bg-card); display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem; color: var(--text-muted); transition: var(--transition);
}
.social-btn:hover { border-color: var(--accent-blue); color: var(--accent-blue); background: rgba(14,165,233,0.1); }
.footer-bottom {
  padding-top: 24px; border-top: 1px solid var(--border-subtle);
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 12px;
}
.footer-note { font-size: 0.78rem; color: var(--text-muted); }
.footer-copy { font-size: 0.78rem; color: var(--text-muted); }

/* ---- Animations ---- */
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.7); }
}
@keyframes rotate-ring {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
@keyframes pulse-expand {
  0% { transform: scale(1); opacity: 0.6; }
  100% { transform: scale(2.2); opacity: 0; }
}
@keyframes node-blink {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.3; transform: scale(0.6); }
}
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 40px rgba(34,197,94,0.2); }
  50% { box-shadow: 0 0 70px rgba(34,197,94,0.45); }
}
@keyframes fade-up {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes slide-in-left {
  from { opacity: 0; transform: translateX(-24px); }
  to { opacity: 1; transform: translateX(0); }
}

.animate-fade-up { animation: fade-up 0.6s ease forwards; }
.animate-slide-left { animation: slide-in-left 0.6s ease forwards; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.opacity-0 { opacity: 0; }

/* ---- Intersection Observer Reveals ---- */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-left { opacity: 0; transform: translateX(-30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal-left.visible { opacity: 1; transform: translateX(0); }
.reveal-right { opacity: 0; transform: translateX(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal-right.visible { opacity: 1; transform: translateX(0); }

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .nav-inner { padding: 0 20px; }
  .rnd-grid { grid-template-columns: repeat(2, 1fr); }
  .pipeline-flow { grid-template-columns: repeat(2, 1fr); }
  .degradation-grid { grid-template-columns: repeat(2, 1fr); }
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; padding: 120px 0 60px; }
  .hero-content { display: flex; flex-direction: column; align-items: center; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-btns { justify-content: center; }
  
  .hero-visual { margin-top: 40px; justify-content: center; flex-direction: column; gap: 20px; }
  .battery-viz { width: 220px; height: 220px; margin-bottom: 20px; }
  .hero-float-card { 
    position: relative !important; top: auto !important; left: auto !important; right: auto !important; bottom: auto !important;
    margin: 0 auto !important; width: 100% !important; max-width: 280px !important;
    transform: none !important; opacity: 1 !important; visibility: visible !important;
    box-shadow: var(--shadow-card) !important;
  }
  
  .researchers-grid { grid-template-columns: 1fr; }
  .researcher-card { padding: 32px 24px; }
  
  .section-pad { padding: 80px 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 40px; text-align: center; }
}

@media (max-width: 480px) {
  .nav-logo-title { font-size: 1rem; }
  .section-title { font-size: 1.75rem; }
  .hero-title { font-size: 2.25rem; }
  
  .researcher-header { flex-direction: column; align-items: center; text-align: center; gap: 20px; }
  .researcher-photo { width: 100px; height: 100px; }
  .researcher-badges { justify-content: center; }
  .researcher-contacts { align-items: center; }
  
  .metrics-grid { grid-template-columns: 1fr; }
  .aiml-grid { grid-template-columns: 1fr; }
  .why-stats-row { grid-template-columns: 1fr; }
}