:root {
    --bg: #f2f9f5;
    --bg2: #e8f5ed;
    --white: #ffffff;
    --green: #00a84f;
    --green-bright: #00c962;
    --green-light: #e0f5ea;
    --green-mid: #a8ddc0;
    --green-dark: #005c2b;
    --navy: #0d2340;
    --navy2: #1a3a6e;
    --navy-light: #e8edf5;
    --text: #0d2340;
    --text-muted: #4a6a5a;
    --card-bg: #ffffff;
    --border: rgba(0,168,79,0.2);
    --shadow: rgba(0,92,43,0.1);
    /* legacy aliases */
    --black: #f2f9f5;
    --dark: #e8f5ed;
    --gray: #4a6a5a;
    --green-dim: #00a84f;
  }
  @keyframes gridMove {
    0% { background-position: 0 0; }
    100% { background-position: 60px 60px; }
  }

  /* ===== HEADER ===== */
  


  @keyframes pulse {
    0%,100% { transform: translate(-50%,-50%) scale(1); opacity: 0.6; }
    50% { transform: translate(-50%,-50%) scale(1.1); opacity: 1; }
  }

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

  /* ===== SECTION STYLES ===== */
  .section {
    position: relative;
    z-index: 1;
    padding-top:1.5rem;
   
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
  }

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

  nav a[style*="color:var(--green)"] { color: var(--green) !important; }

  .section-divider {
    width: 90%;
    margin: 0 auto;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--green-mid), transparent);
    position: relative;
    z-index: 1;
  }

  /* ===== BATTERY CARDS ===== */
  .battery-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    transition: border-color 0.4s, box-shadow 0.4s;
    position: relative;
    box-shadow: 0 4px 24px var(--shadow);
  }

  .battery-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--green), transparent);
    opacity: 0;
    transition: opacity 0.4s;
  }

  .battery-card:hover {
    border-color: rgba(0,168,79,0.5);
    box-shadow: 0 20px 60px rgba(0,92,43,0.15), 0 0 0 1px rgba(0,168,79,0.15);
  }

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

  .battery-card.reverse { direction: rtl; }
  .battery-card.reverse > * { direction: ltr; }

  .card-image {
    position: relative;
    overflow: hidden;
    height: 500px;
    background: var(--dark);
  }

  .card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
    filter: saturate(0.8) brightness(0.85);
  }
 .battery-image {
  position: relative;
  overflow: hidden;
  height: 500px;   /* fixed smaller height */
  /* background: var(--dark); */
}


  .battery-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform 0.6s ease;
    filter: saturate(0.8) brightness(0.85);
  }

  .battery-card:hover .card-image img {
    transform: scale(1.05);
    filter: saturate(1) brightness(0.95);
  }

  .card-image-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0,230,118,0.06), transparent);
  }
  .battery-image-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0,230,118,0.06), transparent);
  }

  .card-image-badge {
    position: absolute;
    bottom: 1rem;
    left: 1rem;
    background: rgba(0,0,0,0.7);
    border: 1px solid var(--green-dim);
    color: var(--green);
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    padding: 0.3rem 0.7rem;
    border-radius: 3px;
    backdrop-filter: blur(6px);
  }

  .card-content {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    background: var(--white);
  }

  .card-eyebrow {
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.3em;
    color: var(--green);
    text-transform: uppercase;
    margin-bottom: 0.8rem;
  }

  .card-title {
    font-family: 'Rajdhani', sans-serif;
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--navy);
  }

  /* ===== TABLE STYLES ===== */
  .voltage-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
  }

  .voltage-table thead tr {
    background: var(--green-light);
  }

  .voltage-table thead th {
    font-family: 'Rajdhani', sans-serif;
    font-weight: 700;
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--green-dark);
    padding: 0.7rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--green-mid);
  }

  .voltage-table tbody tr {
    border-bottom: 1px solid rgba(0,168,79,0.1);
    transition: background 0.3s;
  }

  .voltage-table tbody tr:hover {
    background: var(--green-light);
  }

  .voltage-table tbody td {
    padding: 0.8rem 1rem;
    vertical-align: middle;
  }

  .voltage-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--green), var(--green-dark));
    color: #fff;
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    white-space: nowrap;
    box-shadow: 0 2px 8px rgba(0,168,79,0.3);
  }

  .range-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
  }

  .pill {
    background: var(--navy-light);
    border: 1px solid rgba(13,35,64,0.15);
    color: var(--navy);
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.72rem;
    padding: 0.2rem 0.5rem;
    border-radius: 3px;
    transition: background 0.3s, border-color 0.3s, color 0.3s;
  }

  .pill:hover {
    background: var(--green-light);
    border-color: var(--green);
    color: var(--green-dark);
  }

  /* ===== LFP DUAL SECTION ===== */
  .lfp-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }

  .lfp-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transition: border-color 0.4s, box-shadow 0.4s;
    position: relative;
    box-shadow: 0 4px 20px var(--shadow);
  }

  .lfp-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--green), transparent);
    opacity: 0;
    transition: opacity 0.4s;
  }

  .lfp-card:hover { border-color: rgba(0,168,79,0.5); box-shadow: 0 20px 50px rgba(0,92,43,0.12); }
  .lfp-card:hover::before { opacity: 1; }

  .lfp-image {
    height: 220px;
    overflow: hidden;
    position: relative;
  }

  .lfp-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform 0.6s ease;
  }

  .lfp-card:hover .lfp-image img { transform: scale(1.05); }

  .lfp-image-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, transparent 50%, rgba(255,255,255,0.15));
  }

  .lfp-content { padding: 1.8rem; background: var(--white); }

  .lfp-title {
    font-family: 'Rajdhani', sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--navy);
  }

  /* ===== APPLICATIONS ===== */
  .apps-section {
    position: relative;
    z-index: 1;
    padding: 4rem 5%;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
  }

  .apps-section.visible { opacity: 1; transform: translateY(0); }

  .apps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
  }

  .app-item {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    transition: background 0.3s, border-color 0.3s, transform 0.3s, box-shadow 0.3s;
    cursor: default;
    box-shadow: 0 2px 10px var(--shadow);
  }

  .app-item:hover {
    background: var(--green-light);
    border-color: var(--green);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,92,43,0.12);
  }

  .app-icon {
    font-size: 2rem;
    margin-bottom: 0.8rem;
    display: block;
  }

  .app-name {
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--navy);
    letter-spacing: 0.05em;
  }

  /* ===== SECTION HEADER ===== */
  .section-header {
    margin-bottom: 2.5rem;
  }

  .section-header .eyebrow {
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.35em;
    color: var(--green);
    text-transform: uppercase;
    margin-bottom: 0.6rem;
  }

  .section-header h2 {
    font-family: 'Rajdhani', sans-serif;
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    line-height: 1.1;
    color: var(--navy);
  }

  .section-header h2 span { color: var(--green); }

  /* ===== FOOTER ===== */
  footer {
    position: relative;
    z-index: 1;
    border-top: 1px solid var(--green-mid);
    padding: 2.5rem 5%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 3rem;
    background: var(--white);
    box-shadow: 0 -2px 20px var(--shadow);
  }

  .footer-logo {
    font-family: 'Rajdhani', sans-serif;
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: 0.1em;
    color: var(--navy);
  }

  .footer-logo span { color: var(--green); }

  .footer-info {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: 'Share Tech Mono', monospace;
  }

  .footer-contact {
    text-align: right;
    font-size: 0.8rem;
    color: var(--text-muted);
  }

  .footer-contact a { color: var(--green); text-decoration: none; }

  .scroll-line {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--green), var(--green-bright));
    width: 0%;
    z-index: 100;
    box-shadow: 0 0 8px rgba(0,168,79,0.5);
    transition: width 0.1s;
  }

  /* ===== RESPONSIVE ===== */
  @media (max-width: 900px) {
    .battery-card, .battery-card.reverse {
      grid-template-columns: 1fr;
      direction: ltr;
    }
    .card-image { min-height: 220px; }
    .lfp-grid { grid-template-columns: 1fr; }
    nav { display: none; }
    .hero-stats { gap: 1rem; }
  }

  @keyframes charge {
    0% { opacity: 0.4; }
    50% { opacity: 1; }
    100% { opacity: 0.4; }
  }

  .charge-indicator {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--green);
    margin-right: 0.5rem;
    animation: charge 2s ease-in-out infinite;
    box-shadow: 0 0 6px rgba(0,168,79,0.5);
  }

  .nav-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--green-mid);
    border: 1px solid var(--green);
    transition: background 0.3s;
  }

  .nav-dot.active { background: var(--green); box-shadow: 0 0 6px rgba(0,168,79,0.4); }