:root {
     --color-primary: #1d4ed8;
     /* blue */
     --color-accent: #f97316;
     /* orange */
     --color-dark: #0f172a;
     --color-light: #f3f4f6;
     --radius-pill: 999px;
     --shadow-soft: 0 12px 30px rgba(15, 23, 42, 0.12);
 }

 * {
     box-sizing: border-box;
 }

 html {
     scroll-behavior: smooth;
     scroll-padding-top: 70px;
 }

 body {
     margin: 0;
     font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
     background: #e5e7eb;
     color: #111827;
 }

 a {
     color: inherit;
     text-decoration: none;
 }

 .container {
     max-width: 1200px;
     margin: 0 auto;
     padding: 0 1.5rem;
 }

 /* Top bar + nav */
 /* .top-bar {
     background: #020617;
     color: #e5e7eb;
     font-size: 0.85rem;
     padding: 0.35rem 0;
 }

 .top-bar-inner {
     max-width: 1100px;
     margin: 0 auto;
     padding: 0 1.5rem;
     display: flex;
     justify-content: space-between;
     gap: 1rem;
 }

 header {
     background: white;
     border-bottom: 1px solid #e5e7eb;
 }

 .nav {
     max-width: 1100px;
     margin: 0 auto;
     padding: 0.75rem 1.5rem;
     display: flex;
     align-items: center;
     justify-content: space-between;
     gap: 1rem;
 }

 .nav-left {
     display: flex;
     align-items: center;
     gap: 0.6rem;
 }

 .logo-mark {
     width: 36px;
     height: 36px;
     border-radius: 999px;
     border: 2px solid #111827;
     display: flex;
     align-items: center;
     justify-content: center;
     font-weight: 700;
 }

 .nav-menu {
     display: flex;
     gap: 1.25rem;
     font-size: 0.9rem;
 }

 .nav-menu a {
     position: relative;
 }

 .nav-menu a.active::after {
     content: "";
     position: absolute;
     left: 0;
     bottom: 0;
     width: 100%;
     height: 2px;
     background: var(--color-primary);
     border-radius: 999px;
 }

 .nav-cta {
     display: flex;
     gap: 0.75rem;
 }

 .pill {
     border-radius: var(--radius-pill);
     padding: 0.45rem 1.1rem;
     font-size: 0.85rem;
     font-weight: 600;
     border: 1px solid transparent;
     cursor: pointer;
 }

 .pill-primary {
     background: var(--color-accent);
     color: #111827;
     border-color: var(--color-accent);
 }

 .pill-outline {
     background: transparent;
     color: #111827;
     border-color: #cbd5f5;
 } */

 /* Hero */
 .hero {
     background: white;
     padding: 2.5rem 0 2rem;
     border-bottom: 1px solid #e5e7eb;
 }

 .hero-inner {
     display: flex;
     gap: 2rem;
     align-items: center;
 }

 .hero-left,
 .hero-right {
     flex: 1;
 }

 .kicker {
     font-size: 0.8rem;
     letter-spacing: 0.18em;
     text-transform: uppercase;
     color: #6b7280;
     margin-bottom: 0.5rem;
 }

 .hero-title {
     margin: 0 0 0.5rem;
     font-size: 2rem;
 }

 .hero-sub {
     font-size: 0.95rem;
     color: #4b5563;
     margin-bottom: 1.25rem;
 }

 .hero-badges {
     display: flex;
     flex-wrap: wrap;
     gap: 0.4rem;
     font-size: 0.78rem;
 }

 .hero-badge {
     padding: 0.18rem 0.7rem;
     border-radius: var(--radius-pill);
     background: #eff6ff;
     color: #1d4ed8;
     border: 1px solid #bfdbfe;
     text-transform: uppercase;
     letter-spacing: 0.08em;
 }

 .hero-card {
     background: #0f172a;
     color: #e5e7eb;
     border-radius: 1.25rem;
     padding: 1.25rem 1.5rem;
     box-shadow: var(--shadow-soft);
     font-size: 0.9rem;
 }

 .hero-card p {
     margin: 0.4rem 0 0;
     font-size: 0.85rem;
     color: #cbd5f5;
 }

 .hero-list {
     margin: 1rem 0 0;
     padding-left: 1.1rem;
     font-size: 0.9rem;
     color: #e5e7eb;
 }

 .hero-list li {
     margin-bottom: 0.15rem;
 }

 /* Sections */
 .section {
     padding: 2.5rem 0;
 }

 .section-title-row {
     display: flex;
     justify-content: space-between;
     align-items: baseline;
     gap: 1rem;
     flex-wrap: wrap;
     margin-bottom: 1.4rem;
 }

 .section-title {
     margin: 0;
     font-size: 1.5rem;
 }

 .section-sub {
     margin: 0;
     font-size: 0.9rem;
     color: #4b5563;
     max-width: 480px;
 }

 /* 3-column cards */
 .three-col {
     display: grid;
     grid-template-columns: repeat(3, minmax(0, 1fr));
     gap: 1rem;
 }

 .card {
     background: white;
     border-radius: 1.1rem;
     padding: 1rem 1.1rem 1.1rem;
     border: 1px solid #e5e7eb;
     box-shadow: var(--shadow-soft);
     font-size: 0.9rem;
 }

 .card h3 {
     margin: 0 0 0.35rem;
     font-size: 1rem;
 }

 .card small {
     display: block;
     font-size: 0.75rem;
     text-transform: uppercase;
     letter-spacing: 0.08em;
     color: #6b7280;
     margin-bottom: 0.25rem;
 }

 .card ul {
     margin: 0.4rem 0 0.2rem;
     padding-left: 1.1rem;
     font-size: 0.86rem;
     color: #4b5563;
 }

 .card li {
     margin-bottom: 0.2rem;
 }

 .chip-row {
     display: flex;
     flex-wrap: wrap;
     gap: 0.25rem;
     margin-top: 0.45rem;
     font-size: 0.75rem;
 }

 .chip {
     padding: 0.12rem 0.6rem;
     border-radius: 999px;
     background: #f3f4f6;
     border: 1px solid #e5e7eb;
 }

 /* Two-column layout */
 .two-col {
     display: grid;
     grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
     gap: 1.8rem;
     align-items: flex-start;
 }

 .process-step {
     margin-bottom: 0.9rem;
     padding-bottom: 0.7rem;
     border-bottom: 1px dashed #e5e7eb;
 }

 .process-step:last-child {
     border-bottom: none;
     padding-bottom: 0;
 }

 .process-step h4 {
     margin: 0 0 0.25rem;
     font-size: 0.98rem;
 }

 .process-step p {
     margin: 0;
     font-size: 0.86rem;
     color: #4b5563;
 }

 .side-highlight {
     background: white;
     border-radius: 1.1rem;
     padding: 1rem 1.1rem 1.1rem;
     border: 1px solid #e5e7eb;
     box-shadow: var(--shadow-soft);
     font-size: 0.88rem;
 }

 .side-highlight h3 {
     margin: 0 0 0.4rem;
     font-size: 1rem;
 }

 .side-highlight p {
     margin: 0 0 0.4rem;
     color: #4b5563;
 }

 .side-highlight ul {
     margin: 0.3rem 0 0;
     padding-left: 1.1rem;
     font-size: 0.86rem;
     color: #4b5563;
 }

 .side-highlight li {
     margin-bottom: 0.18rem;
 }

 .badge {
     display: inline-block;
     padding: 0.15rem 0.55rem;
     border-radius: var(--radius-pill);
     background: #eff6ff;
     color: #1d4ed8;
     font-size: 0.75rem;
     border: 1px solid #bfdbfe;
     margin-bottom: 0.35rem;
 }

 /* NiMH vs Lithium section */
 .compare-strip {
     background: #0f172a;
     color: #e5e7eb;
     border-radius: 1.3rem;
     padding: 1.6rem 1.7rem;
     box-shadow: var(--shadow-soft);
     margin-top: 1rem;
     font-size: 0.9rem;
 }

 .compare-strip h3 {
     margin: 0 0 0.4rem;
     font-size: 1.1rem;
 }

 .compare-cols {
     display: grid;
     grid-template-columns: repeat(2, minmax(0, 1fr));
     gap: 1.3rem;
     margin-top: 0.7rem;
 }

 .compare-cols h4 {
     margin: 0 0 0.35rem;
     font-size: 0.96rem;
 }

 .compare-cols ul {
     margin: 0;
     padding-left: 1.1rem;
     font-size: 0.86rem;
     color: #cbd5f5;
 }

 /* CTA section */
 .cta-section {
     padding: 2.5rem 0 3rem;
 }

 .cta-box {
     background: #0f172a;
     color: #e5e7eb;
     border-radius: 1.5rem;
     padding: 1.8rem 1.9rem;
     box-shadow: var(--shadow-soft);
     display: flex;
     flex-wrap: wrap;
     gap: 1.5rem;
     align-items: center;
     justify-content: space-between;
 }

 .cta-box h2 {
     margin: 0 0 0.4rem;
     font-size: 1.5rem;
 }

 .cta-box p {
     margin: 0;
     font-size: 0.9rem;
     color: #cbd5f5;
 }

 .cta-actions {
     display: flex;
     flex-wrap: wrap;
     gap: 0.75rem;
 }

 /* Footer */
 footer {
     background: #020617;
     color: #9ca3af;
     font-size: 0.8rem;
     padding: 1.1rem 0;
     margin-top: 0;
 }

 .footer-inner {
     max-width: 1200px;
     margin: 0 auto;
     padding: 0 1.5rem;
     display: flex;
     justify-content: space-between;
     gap: 1rem;
 }

 @media (max-width: 900px) {

     .hero-inner,
     .three-col,
     .two-col,
     .footer-inner,
     .cta-box,
     .compare-cols {
         flex-direction: column;
         display: flex;
     }

     .nav-menu {
         display: none;
     }
 }