:root {
  --color-bg: #f6fbf7;
  --color-surface: #ffffff;
  --color-text: #12221a;
  --color-text-muted: #5a6f62;
  --color-primary: #2a9d63;
  --color-primary-dark: #1f7a4d;
  --color-primary-light: #e6f5ec;
  --color-accent: #e9c46a;
  --color-border: #d4e5db;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(18, 34, 26, 0.08);
  --shadow-lg: 0 12px 40px rgba(18, 34, 26, 0.12);
  --max-width: 1120px;
  --header-height: 72px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

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

img {
  max-width: 100%;
  display: block;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-text);
}

.logo-icon {
  font-size: 1.4rem;
  line-height: 1;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
  align-items: center;
}

.nav-links a {
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--color-primary);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.2s ease;
  border: none;
  cursor: pointer;
}

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

.btn-primary {
  background-color: var(--color-primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(42, 157, 99, 0.35);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  box-shadow: 0 6px 18px rgba(42, 157, 99, 0.45);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  box-shadow: inset 0 0 0 2px var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-primary-light);
  box-shadow: inset 0 0 0 2px var(--color-primary);
}

.btn-large {
  padding: 16px 32px;
  font-size: 1.05rem;
}

.btn-note {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  background: rgba(255, 255, 255, 0.25);
  border-radius: 999px;
}

/* Hero */
.hero {
  padding: 80px 0 100px;
  overflow: hidden;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.badge {
  display: inline-block;
  padding: 6px 14px;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: 999px;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.hero-lead {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 520px;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: relative;
}

.energy-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

.energy-card:nth-child(2) {
  margin-left: 40px;
}

.energy-bar {
  height: 10px;
  background: var(--color-border);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 16px;
}

.energy-bar::before {
  content: "";
  display: block;
  height: 100%;
  width: var(--value);
  background: linear-gradient(90deg, var(--color-primary), #4cc484);
  border-radius: 999px;
  animation: grow 1.2s ease-out forwards;
}

.energy-bar--2::before {
  background: linear-gradient(90deg, var(--color-accent), #f4d06f);
}

@keyframes grow {
  from {
    width: 0;
  }
  to {
    width: var(--value);
  }
}

.energy-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 6px;
}

.energy-score {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--color-text);
}

.energy-score span {
  font-size: 1rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* Sections */
section {
  padding: 96px 0;
}

.section-header {
  max-width: 680px;
  margin: 0 auto 64px;
  text-align: center;
}

.section-header h2 {
  font-size: 2.2rem;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-header p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

/* About */
.about {
  background: var(--color-surface);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.about-card {
  padding: 32px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.about-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.about-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.about-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.about-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* Features */
.features-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.feature-item {
  display: flex;
  gap: 24px;
  padding: 32px;
  background: var(--color-surface);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow);
}

.feature-number {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}

.feature-body h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.feature-body p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* Download */
.download {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-bg));
}

.download-box {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
  padding: 64px;
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

.download-box h2 {
  font-size: 2rem;
  margin-bottom: 16px;
}

.download-box > p {
  color: var(--color-text-muted);
  margin-bottom: 32px;
}

.download-btn {
  margin-bottom: 20px;
}

.download-btn[aria-disabled="true"] {
  opacity: 0.7;
  cursor: not-allowed;
}

.download-meta {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* API docs */
.api {
  background: var(--color-surface);
}

.api-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.api-card {
  padding: 28px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background: var(--color-bg);
}

.api-card h3 {
  font-size: 1.1rem;
  margin-bottom: 16px;
}

.api-card pre {
  background: #12221a;
  color: #e6f5ec;
  padding: 16px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.8rem;
  line-height: 1.5;
}

.api-card code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* Apoio / Funding */
.apoio {
  background: linear-gradient(135deg, #f0f7f2 0%, #e8f4eb 100%);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.apoio .section-header p {
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
}

.funding-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 32px;
  padding: 32px 40px;
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  max-width: 960px;
  margin: 0 auto 28px;
}

.funding-logo {
  flex: 0 1 auto;
  max-height: 72px;
  width: auto;
  object-fit: contain;
  display: block;
}

.funding-note {
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  max-width: 720px;
  margin: 0 auto;
}

/* Contact */
.contact-form {
  max-width: 560px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-row label {
  font-size: 0.9rem;
  font-weight: 600;
}

.form-row input,
.form-row textarea {
  padding: 12px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  font-family: inherit;
  font-size: 1rem;
  background: var(--color-surface);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-row input:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(42, 157, 99, 0.12);
}

.form-status {
  margin-top: 12px;
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 500;
}

.form-status.success {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.form-status.error {
  background: #fff3cd;
  color: #856404;
}

/* Footer */
.site-footer {
  background: var(--color-text);
  color: #fff;
  padding: 40px 0;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
}

.footer-copy {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  max-width: 560px;
}

.footer-funding {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 20px;
}

.footer-funding-logo {
  max-height: 56px;
  width: auto;
  object-fit: contain;
  display: block;
}

/* Responsive */
@media (max-width: 900px) {
  .hero .container {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    order: -1;
    max-width: 480px;
    margin: 0 auto;
  }

  .energy-card:nth-child(2) {
    margin-left: 0;
  }

  .about-grid,
  .features-list,
  .api-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 16px 24px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow);
    transform: translateY(-150%);
    opacity: 0;
    transition: transform 0.25s ease, opacity 0.25s ease;
  }

  .nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
  }

  .nav-links a {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: 60px 0 80px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .download-box {
    padding: 40px 24px;
  }

  section {
    padding: 72px 0;
  }

  .funding-bar {
    gap: 24px;
    padding: 24px;
  }

  .funding-logo,
  .footer-funding-logo {
    max-height: 44px;
  }
}