:root {
  --bg: #f4f0e8;
  --text: #16110f;
  --muted: #5c5049;
  --accent: #005f73;
  --accent-2: #bb3e03;
  --card: rgba(255, 252, 245, 0.84);
  --border: rgba(22, 17, 15, 0.12);
  --shadow: 0 18px 44px rgba(22, 17, 15, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Space Grotesk", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 12% 8%, rgba(0, 95, 115, 0.13), transparent 28%),
    radial-gradient(circle at 90% 24%, rgba(187, 62, 3, 0.15), transparent 34%),
    linear-gradient(165deg, #f4f0e8 0%, #eee4d4 100%);
  line-height: 1.55;
  min-height: 100vh;
}

.bg-shape {
  position: fixed;
  pointer-events: none;
  filter: blur(40px);
  opacity: 0.35;
  z-index: -1;
}

.bg-shape-a {
  width: 360px;
  height: 360px;
  border-radius: 58% 42% 63% 37% / 42% 47% 53% 58%;
  background: #005f73;
  top: -100px;
  right: -90px;
  animation: driftA 16s ease-in-out infinite;
}

.bg-shape-b {
  width: 420px;
  height: 420px;
  border-radius: 45% 55% 30% 70% / 48% 34% 66% 52%;
  background: #bb3e03;
  bottom: -160px;
  left: -120px;
  animation: driftB 18s ease-in-out infinite;
}

.container {
  width: min(1080px, calc(100% - 2rem));
  margin: 0 auto;
}

.battery-page .container {
  width: min(1560px, calc(100% - 2rem));
}

.hero {
  padding: 5rem 0 2rem;
}

.landing-page .container {
  width: min(1280px, calc(100% - 2rem));
}

.landing-page {
  background:
    radial-gradient(circle at 8% 10%, rgba(0, 95, 115, 0.25), transparent 32%),
    radial-gradient(circle at 87% 13%, rgba(187, 62, 3, 0.24), transparent 30%),
    linear-gradient(150deg, #efe4d1 0%, #e8d8be 42%, #eadfcd 100%);
}

.landing-hero {
  padding-top: 4.4rem;
}

.landing-hero-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 1rem;
  align-items: stretch;
}

.launch-panel {
  border: 1px solid rgba(22, 17, 15, 0.16);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.78), rgba(255, 248, 236, 0.62));
  border-radius: 18px;
  padding: 1rem;
  box-shadow: 0 14px 32px rgba(22, 17, 15, 0.14);
}

.launch-panel h2 {
  margin-bottom: 0.6rem;
}

.launch-panel p {
  margin: 0.4rem 0;
  font-size: 0.9rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1rem;
}

.hero-cta {
  text-decoration: none;
  border-radius: 999px;
  padding: 0.58rem 0.95rem;
  border: 1px solid rgba(0, 95, 115, 0.4);
  background: linear-gradient(130deg, #005f73, #0a9396);
  color: #fff;
  font-weight: 700;
  box-shadow: 0 8px 22px rgba(0, 95, 115, 0.24);
}

.hero-cta.ghost {
  color: var(--text);
  background: rgba(255, 255, 255, 0.65);
  border-color: rgba(22, 17, 15, 0.22);
  box-shadow: none;
}

.landing-page .card {
  background: rgba(255, 250, 240, 0.72);
}

.landing-final {
  border: 1px solid rgba(0, 95, 115, 0.25);
}

.top-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.1rem;
}

.top-nav a {
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  font-size: 0.86rem;
  background: rgba(255, 255, 255, 0.5);
}

.top-nav a.active {
  background: rgba(0, 95, 115, 0.12);
  border-color: rgba(0, 95, 115, 0.4);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-2);
  margin-bottom: 0.5rem;
}

h1,
h2 {
  line-height: 1.15;
  margin: 0 0 0.8rem;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.6rem);
  max-width: 14ch;
}

h2 {
  font-size: clamp(1.22rem, 2vw, 1.7rem);
}

.lead {
  max-width: 64ch;
  color: var(--muted);
  margin: 0;
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.2rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  font-size: 0.85rem;
  background: rgba(255, 255, 255, 0.45);
  text-decoration: none;
  color: var(--text);
}

.grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(12, 1fr);
  padding-bottom: 3rem;
}

.card {
  grid-column: span 6;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.2rem;
  box-shadow: var(--shadow);
  backdrop-filter: blur(4px);
}

.card.wide {
  grid-column: span 12;
}

pre {
  margin: 0.85rem 0;
  padding: 0.8rem;
  border-radius: 12px;
  overflow-x: auto;
  border: 1px solid var(--border);
  background: rgba(22, 17, 15, 0.06);
}

code,
pre {
  font-family: "IBM Plex Mono", monospace;
}

ul {
  margin: 0;
  padding-left: 1.1rem;
}

.muted {
  color: var(--muted);
}

.callout {
  border-left: 4px solid rgba(0, 95, 115, 0.55);
  padding-left: 0.8rem;
  margin: 0.3rem 0 0.8rem;
}

.calculator-grid {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 0.75rem;
  align-items: end;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.875rem;
}

input,
select,
button {
  font-family: inherit;
  font-size: 1rem;
  border-radius: 10px;
}

input,
select {
  border: 1px solid var(--border);
  background: #fffdf8;
  padding: 0.65rem 0.7rem;
}

button {
  border: 1px solid transparent;
  background: linear-gradient(145deg, var(--accent), #0a9396);
  color: #fff;
  padding: 0.68rem 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(0, 95, 115, 0.35);
}

.result {
  margin-top: 0.9rem;
  margin-bottom: 0;
  font-weight: 500;
}

.battery-builder {
  grid-template-columns: repeat(5, minmax(130px, 1fr));
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(180px, 1fr));
  gap: 0.8rem;
  margin-top: 1rem;
}

.preset-row {
  margin-bottom: 0.8rem;
}

.preset-btn {
  background: rgba(255, 255, 255, 0.82);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0.45rem 0.78rem;
  border-radius: 999px;
  font-size: 0.86rem;
  cursor: pointer;
}

.preset-btn.active {
  border-color: rgba(0, 95, 115, 0.6);
  background: rgba(0, 95, 115, 0.15);
}

.slider-value {
  display: inline-flex;
  align-self: flex-start;
  margin-top: 0.3rem;
  font-size: 0.82rem;
  padding: 0.12rem 0.45rem;
  border-radius: 999px;
  background: rgba(22, 17, 15, 0.08);
  font-family: "IBM Plex Mono", monospace;
}

.metric-card {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.6);
  padding: 0.8rem;
}

.metric-card h3 {
  font-size: 0.9rem;
  margin: 0 0 0.4rem;
  color: var(--muted);
}

.metric-card p {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
}

.bar-stack {
  margin-top: 0.95rem;
  display: grid;
  gap: 0.55rem;
}

.bar-row {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 0.7rem;
  align-items: center;
  font-size: 0.92rem;
}

.bar-track {
  width: 100%;
  background: rgba(22, 17, 15, 0.1);
  border-radius: 999px;
  height: 12px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  width: 10%;
  border-radius: 999px;
  background: linear-gradient(90deg, #0a9396, #005f73);
  transition: width 0.25s ease;
}

.bar-fill-alt {
  background: linear-gradient(90deg, #ee9b00, #bb3e03);
}

.bar-fill-cycle {
  background: linear-gradient(90deg, #94d2bd, #0a9396);
}

.curve-wrap {
  margin-top: 1rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.55);
  padding: 0.8rem;
}

.curve-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.6rem;
}

.curve-head h3 {
  margin: 0;
  font-size: 1rem;
}

#dischargeCanvas {
  width: 100%;
  height: auto;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(22, 17, 15, 0.04);
}

.curve-note {
  margin: 0.6rem 0 0;
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.sim-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(130px, 1fr));
  gap: 0.7rem;
  align-items: end;
}

.lab-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(130px, 1fr));
  gap: 0.75rem;
  margin-bottom: 0.8rem;
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(140px, 1fr));
  gap: 0.75rem;
}

.kpi-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.7rem;
  background: rgba(255, 255, 255, 0.62);
}

.kpi-card h3 {
  margin: 0 0 0.4rem;
  font-size: 0.84rem;
  color: var(--muted);
}

.kpi-card p {
  margin: 0;
  font-weight: 700;
}

.chart-controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(180px, 1fr));
  gap: 0.75rem;
  margin-bottom: 0.8rem;
}

.vs-strip {
  margin-bottom: 0.8rem;
}

.vs-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.68);
  padding: 0.7rem;
}

.vs-card h3 {
  margin: 0 0 0.45rem;
  font-size: 0.92rem;
}

.vs-card p {
  margin: 0.18rem 0;
  font-size: 0.84rem;
  font-family: "IBM Plex Mono", monospace;
}

.vs-metric {
  position: relative;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0.28rem 0.45rem 0.28rem 1.7rem;
}

.vs-metric::before {
  content: attr(data-marker);
  position: absolute;
  left: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  font-weight: 800;
  font-size: 0.78rem;
  opacity: 0.95;
}

.vs-pos {
  background: rgba(15, 118, 110, 0.15);
  border-color: rgba(15, 118, 110, 0.45);
  color: #0b6159;
  font-weight: 700;
}

.vs-neg {
  background: rgba(180, 35, 24, 0.14);
  border-color: rgba(180, 35, 24, 0.42);
  color: #8f2318;
  font-weight: 700;
}

.vs-flat {
  background: rgba(22, 17, 15, 0.06);
  border-color: rgba(22, 17, 15, 0.18);
  color: var(--text);
}

.chart-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(280px, 1fr));
  gap: 0.8rem;
}

.chart-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.62);
  padding: 0.7rem;
}

.chart-card h3 {
  margin: 0 0 0.5rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.chart-card canvas {
  width: 100%;
  height: 320px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(22, 17, 15, 0.03);
}

.chart-wide {
  margin-top: 0.8rem;
}

#trendChart {
  height: 280px;
}

.delta-pos {
  color: #0f766e;
  font-weight: 700;
}

.delta-neg {
  color: #b42318;
  font-weight: 700;
}

.check {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.55rem 0.6rem;
  background: rgba(255, 255, 255, 0.6);
  font-size: 0.88rem;
}

.check input {
  width: 16px;
  height: 16px;
  margin: 0;
}

.filter-btn {
  background: rgba(255, 255, 255, 0.72);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0.48rem 0.82rem;
  border-radius: 999px;
  font-size: 0.9rem;
  cursor: pointer;
}

.filter-btn.active {
  background: rgba(0, 95, 115, 0.15);
  border-color: rgba(0, 95, 115, 0.5);
}

.table-wrap {
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.56);
}

.compare-table {
  border-collapse: collapse;
  width: 100%;
  min-width: 980px;
}

.compare-table th,
.compare-table td {
  text-align: left;
  padding: 0.7rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
  vertical-align: top;
}

.compare-table th {
  background: rgba(22, 17, 15, 0.06);
  font-size: 0.84rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.footer {
  padding-bottom: 2.2rem;
  color: var(--muted);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 0.65rem;
}

.email-link,
.ig-link {
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 0.72rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
  background: rgba(255, 255, 255, 0.68);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.email-link:hover,
.ig-link:hover {
  transform: translateY(-1px);
  border-color: rgba(0, 95, 115, 0.45);
  box-shadow: 0 8px 18px rgba(0, 95, 115, 0.2);
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

@keyframes driftA {
  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
  50% {
    transform: translate(-24px, 20px) rotate(8deg);
  }
}

@keyframes driftB {
  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
  50% {
    transform: translate(26px, -12px) rotate(-6deg);
  }
}

@media (max-width: 900px) {
  .landing-page .container {
    width: calc(100% - 1rem);
  }

  .landing-hero-grid {
    grid-template-columns: 1fr;
  }

  .battery-page .container {
    width: calc(100% - 1rem);
  }

  .card {
    grid-column: span 12;
  }

  .calculator-grid {
    grid-template-columns: 1fr;
  }

  .battery-builder {
    grid-template-columns: 1fr;
  }

  .sim-grid {
    grid-template-columns: 1fr;
  }

  .lab-grid {
    grid-template-columns: 1fr;
  }

  .kpi-grid {
    grid-template-columns: 1fr;
  }

  .chart-controls {
    grid-template-columns: 1fr;
  }

  .chart-grid {
    grid-template-columns: 1fr;
  }

  .chart-card canvas {
    height: 280px;
  }

  #trendChart {
    height: 240px;
  }

  .metric-grid {
    grid-template-columns: 1fr;
  }

  .compare-table {
    min-width: 860px;
  }

  .compare-table th,
  .compare-table td {
    padding: 0.5rem;
    font-size: 0.82rem;
    white-space: nowrap;
  }

  .compare-table th:first-child,
  .compare-table td:first-child {
    position: sticky;
    left: 0;
    z-index: 2;
    background: #f8f3ea;
    white-space: normal;
    min-width: 180px;
  }

  .compare-table th:first-child {
    z-index: 3;
  }

  .bar-row {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .bg-shape,
  .reveal,
  button {
    animation: none;
    transition: none;
  }
}