:root {
  --ink: #17212b;
  --muted: #5f6f7a;
  --paper: #f7faf8;
  --surface: #ffffff;
  --line: #dbe7df;
  --green: #1f8a5b;
  --green-dark: #12623f;
  --teal: #0f7f8a;
  --yellow: #f6c84c;
  --coral: #e76f51;
  --blue: #3d79d8;
  --shadow: 0 18px 45px rgba(23, 33, 43, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(18px, 4vw, 56px);
  background: rgba(247, 250, 248, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  color: #ffffff;
  background: var(--green);
  border-radius: 8px;
}

nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: clamp(12px, 2.5vw, 28px);
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 700;
}

nav a:hover {
  color: var(--green-dark);
}

.hero {
  min-height: calc(100vh - 128px);
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 1.05fr);
  align-items: center;
  gap: clamp(28px, 5vw, 76px);
  padding: clamp(38px, 7vw, 90px) clamp(18px, 5vw, 72px);
  background:
    linear-gradient(120deg, rgba(31, 138, 91, 0.1), transparent 44%),
    linear-gradient(180deg, #ffffff 0%, #edf7f2 100%);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-size: clamp(3.1rem, 8vw, 7.5rem);
  line-height: 0.92;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 1.04;
  letter-spacing: 0;
}

h3 {
  margin: 18px 0 10px;
  font-size: 1.22rem;
}

.intro {
  max-width: 620px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.24rem);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.button.primary {
  color: #ffffff;
  background: var(--green);
}

.button.secondary {
  color: var(--green-dark);
  background: #ffffff;
  border-color: var(--line);
}

.button:hover {
  transform: translateY(-1px);
}

.energy-board {
  position: relative;
  min-height: 520px;
  border-radius: 8px;
  overflow: hidden;
  background:
    radial-gradient(circle at 70% 16%, rgba(246, 200, 76, 0.32), transparent 18%),
    linear-gradient(180deg, #bfe8f0 0 42%, #83caa0 42% 70%, #4f9b72 70% 100%);
  box-shadow: var(--shadow);
}

.charge-orb {
  position: absolute;
  top: 50px;
  right: 70px;
  width: 86px;
  height: 86px;
  border: 10px solid rgba(255, 255, 255, 0.85);
  border-radius: 50%;
  background: conic-gradient(var(--yellow) 0 72%, rgba(255, 255, 255, 0.35) 72% 100%);
  box-shadow: 0 0 70px rgba(31, 138, 91, 0.55);
}

.battery-bank {
  position: absolute;
  left: 54px;
  bottom: 124px;
  display: flex;
  align-items: flex-end;
  gap: 14px;
}

.battery-bank span {
  position: relative;
  display: block;
  width: 58px;
  height: 178px;
  border: 5px solid #f4fbf8;
  border-radius: 8px;
  background: linear-gradient(180deg, #f8fff9 0 24%, var(--green) 24% 100%);
  box-shadow: 0 16px 26px rgba(23, 33, 43, 0.18);
}

.battery-bank span::before {
  content: "";
  position: absolute;
  top: -17px;
  left: 16px;
  width: 20px;
  height: 12px;
  border-radius: 5px 5px 0 0;
  background: #f4fbf8;
}

.battery-bank span:nth-child(2) {
  height: 224px;
  background: linear-gradient(180deg, #f8fff9 0 12%, var(--yellow) 12% 100%);
}

.battery-bank span:nth-child(3) {
  height: 142px;
  background: linear-gradient(180deg, #f8fff9 0 38%, var(--teal) 38% 100%);
}

.storage-row {
  position: absolute;
  right: 42px;
  bottom: 112px;
  display: grid;
  grid-template-columns: repeat(4, 58px);
  gap: 8px;
  transform: skewX(-10deg);
}

.storage-row span {
  aspect-ratio: 1.4;
  position: relative;
  background: linear-gradient(180deg, #f8fff9 0 18%, #1f8a5b 18% 100%);
  border: 3px solid #d8f2ff;
}

.storage-row span::after {
  content: "";
  position: absolute;
  top: 8px;
  right: -10px;
  width: 8px;
  height: 18px;
  background: #d8f2ff;
  border-radius: 0 4px 4px 0;
}

.city {
  position: absolute;
  right: 28px;
  bottom: 188px;
  display: flex;
  align-items: flex-end;
  gap: 10px;
}

.city span {
  display: block;
  width: 38px;
  background: #29445a;
  border-top: 8px solid #f2f7fa;
}

.city span:nth-child(1) { height: 80px; }
.city span:nth-child(2) { height: 116px; }
.city span:nth-child(3) { height: 94px; }
.city span:nth-child(4) { height: 132px; }

.power-line {
  position: absolute;
  left: -20px;
  right: -20px;
  bottom: 86px;
  height: 12px;
  background: #273a34;
  box-shadow: 0 20px 0 rgba(39, 58, 52, 0.28);
}

.stats-strip,
.section {
  padding-inline: clamp(18px, 5vw, 72px);
}

.stats-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
}

.stats-strip article {
  display: grid;
  gap: 8px;
  min-height: 150px;
  padding: 28px;
  background: #ffffff;
}

.stats-strip strong {
  color: var(--green);
  font-size: 2.2rem;
}

.stats-strip span,
.module-card p,
.app-subdivision p,
.mini-app-card p,
.software-card p,
.software-card li,
.app-folder-card span,
.folder-card p,
.download-panel p,
.doc-page p,
.action-list p,
footer p {
  color: var(--muted);
  line-height: 1.65;
}

.section {
  padding-top: clamp(64px, 9vw, 112px);
  padding-bottom: clamp(64px, 9vw, 112px);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.module-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.module-card,
.mini-app-card,
.software-card,
.app-folder-card,
.folder-card,
.download-panel,
.doc-index,
.doc-page,
.quiz-card,
.score-panel,
.action-list article {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.module-card {
  min-height: 280px;
  padding: 24px;
}

.icon {
  position: relative;
  width: 52px;
  height: 52px;
  border-radius: 8px;
  background: #ecf7f1;
}

.storage-icon::before,
.grid-icon::before,
.home-icon::before,
.battery-icon::before {
  content: "";
  position: absolute;
  inset: 12px;
}

.storage-icon::before {
  border: 4px solid var(--green);
  border-radius: 5px;
  background: linear-gradient(90deg, var(--yellow) 0 68%, transparent 68%);
  box-shadow: 24px 8px 0 -7px var(--green);
}

.grid-icon::before {
  border: 4px solid var(--teal);
  background: linear-gradient(90deg, transparent 43%, var(--teal) 43% 57%, transparent 57%),
    linear-gradient(0deg, transparent 43%, var(--teal) 43% 57%, transparent 57%);
}

.home-icon::before {
  background: var(--green);
  clip-path: polygon(50% 0, 100% 38%, 100% 100%, 0 100%, 0 38%);
}

.battery-icon::before {
  border: 4px solid var(--blue);
  border-radius: 4px;
  box-shadow: 25px 8px 0 -7px var(--blue);
}

.apps-section {
  background: #ffffff;
}

.app-folder-block + .app-folder-block {
  margin-top: 42px;
}

.app-folder-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-bottom: 34px;
}

.app-folder-card {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  padding: 22px;
}

.app-folder-card h3 {
  margin: 0 0 8px;
  font-size: 1.34rem;
}

.app-folder-card .eyebrow {
  margin-bottom: 6px;
}

.app-folder-card:hover {
  border-color: var(--green);
  transform: translateY(-1px);
}

.app-subdivision {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 18px;
  padding: 22px;
  background: #f4faf7;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.app-subdivision h3,
.mini-app-card h4 {
  margin: 0;
}

.app-subdivision p {
  max-width: 520px;
  margin: 0;
}

.new-app-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 28px;
}

.mini-app-card {
  min-height: 190px;
  padding: 20px;
}

.mini-app-card span {
  color: var(--coral);
  font-weight: 800;
}

.mini-app-card h4 {
  margin-top: 12px;
  font-size: 1.05rem;
}

.mini-app-card p {
  margin-bottom: 0;
}

.mini-app-card .button,
.software-card .button {
  margin-top: 18px;
}

.software-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.software-card {
  min-height: 330px;
  padding: 24px;
}

.software-tag {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  color: var(--green-dark);
  background: #e6f6ee;
  border-radius: 8px;
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.software-card ul {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
  padding-left: 20px;
}

.downloads-section {
  background: #eef7f9;
}

.download-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 22px;
  align-items: start;
}

.folder-grid {
  display: grid;
  gap: 16px;
}

.folder-card {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 18px;
  padding: 22px;
}

.folder-card h3 {
  margin-top: 0;
}

.folder-card .button {
  margin-top: 8px;
}

.folder-icon {
  position: relative;
  display: block;
  width: 58px;
  height: 44px;
  margin-top: 4px;
  border-radius: 8px;
  background: var(--yellow);
  box-shadow: inset 0 -12px 0 rgba(23, 33, 43, 0.08);
}

.folder-icon::before {
  content: "";
  position: absolute;
  top: -10px;
  left: 0;
  width: 28px;
  height: 14px;
  border-radius: 8px 8px 0 0;
  background: var(--yellow);
}

.download-panel {
  display: grid;
  gap: 18px;
  padding: 22px;
}

.subscribe-form,
.folder-form {
  display: grid;
  gap: 12px;
}

.subscribe-form h3,
.folder-form h3 {
  margin: 0;
}

.subscribe-form label,
.folder-form label {
  display: grid;
  gap: 6px;
  color: var(--ink);
  font-weight: 800;
}

.subscribe-form input,
.folder-form input {
  width: 100%;
  min-height: 44px;
  padding: 0 12px;
  color: var(--ink);
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
}

.download-panel p {
  margin: 0;
  font-size: 0.92rem;
}

.docs-section {
  background: #f3f7fb;
}

.doc-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.doc-index {
  position: sticky;
  top: 88px;
  display: grid;
  gap: 8px;
  padding: 16px;
}

.doc-index a {
  display: block;
  padding: 12px 14px;
  color: var(--muted);
  border-radius: 8px;
  font-weight: 800;
}

.doc-index a:hover {
  color: var(--green-dark);
  background: #e6f6ee;
}

.doc-pages {
  display: grid;
  gap: 14px;
}

.doc-page {
  padding: 24px;
}

.doc-page h3 {
  margin-top: 0;
}

.lab-section {
  background: #eaf4ef;
}

.lab-layout {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  gap: 24px;
  align-items: stretch;
}

.lab-controls {
  display: grid;
  gap: 18px;
  padding: 24px;
  background: var(--ink);
  border-radius: 8px;
}

.lab-controls label {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  color: #ffffff;
  font-weight: 800;
}

.lab-controls input {
  grid-column: 1 / -1;
  width: 100%;
  accent-color: var(--yellow);
}

.lab-results {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 230px;
  gap: 18px;
}

canvas {
  width: 100%;
  height: auto;
  min-height: 320px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.score-panel {
  display: grid;
  align-content: center;
  gap: 10px;
  padding: 24px;
}

.score-panel p,
.score-panel span {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.score-panel strong {
  color: var(--green);
  font-size: 3.6rem;
  line-height: 1;
}

.quiz-card {
  max-width: 820px;
  padding: 26px;
}

#questionText {
  margin-top: 0;
  font-size: 1.25rem;
  font-weight: 800;
}

.answers {
  display: grid;
  gap: 10px;
  margin: 20px 0;
}

.answer-button {
  width: 100%;
  padding: 14px 16px;
  color: var(--ink);
  background: #f4faf7;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
}

.answer-button.correct {
  border-color: var(--green);
  background: #e6f6ee;
}

.answer-button.wrong {
  border-color: var(--coral);
  background: #fff0eb;
}

.quiz-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

#quizResult {
  color: var(--muted);
  font-weight: 700;
}

.action-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.action-list article {
  padding: 22px;
}

.action-list span {
  color: var(--coral);
  font-weight: 800;
}

footer {
  padding: 28px clamp(18px, 5vw, 72px);
  background: var(--ink);
}

footer p {
  margin: 0;
  color: #dbe7df;
}

@media (max-width: 980px) {
  .hero,
  .download-layout,
  .lab-layout,
  .lab-results {
    grid-template-columns: 1fr;
  }

  .energy-board {
    min-height: 420px;
  }

  .module-grid,
  .app-folder-grid,
  .new-app-grid,
  .software-grid,
  .action-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .doc-layout {
    grid-template-columns: 1fr;
  }

  .doc-index {
    position: static;
  }
}

@media (max-width: 680px) {
  .topbar {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    width: 100%;
    justify-content: flex-start;
    gap: 10px 16px;
    font-size: 0.86rem;
  }

  .hero {
    min-height: auto;
    padding-top: 42px;
  }

  .energy-board {
    min-height: 340px;
  }

  .battery-bank {
    left: 24px;
    bottom: 108px;
    scale: 0.72;
    transform-origin: bottom left;
  }

  .storage-row {
    right: 20px;
    bottom: 92px;
    grid-template-columns: repeat(2, 52px);
  }

  .city {
    right: 18px;
    bottom: 156px;
    scale: 0.78;
    transform-origin: bottom right;
  }

  .stats-strip,
  .module-grid,
  .app-folder-grid,
  .new-app-grid,
  .software-grid,
  .action-list {
    grid-template-columns: 1fr;
  }

  .app-subdivision {
    align-items: flex-start;
    flex-direction: column;
  }

  .app-folder-card,
  .folder-card {
    grid-template-columns: 1fr;
  }

  .quiz-footer {
    align-items: stretch;
    flex-direction: column;
  }

  .quiz-footer .button {
    width: 100%;
  }
}