/* ============================================================
   PlantSim Website — style.css
   Plant AnalytiX brand color: rgb(108, 204, 21)
   ============================================================ */

/* ---- Google Fonts ----------------------------------------- */
@import url('https://fonts.googleapis.com/css2?family=Lato:wght@300;400;700&family=Roboto:wght@300;400;500&display=swap');

/* ---- CSS Custom Properties (Light mode defaults) ----------- */
:root {
  --color-brand:        rgb(108, 204, 21);
  --color-brand-dark:   rgb(85, 165, 15);
  --color-brand-light:  rgb(140, 220, 60);
  --color-bg:           #ffffff;
  --color-bg-alt:       #f7f9f4;
  --color-bg-hero:      rgb(108, 204, 21);
  --color-text:         #333333;
  --color-text-muted:   #777777;
  --color-text-hero:    #ffffff;
  --color-card-bg:      #ffffff;
  --color-card-border:  #e8ede0;
  --color-border:       #e5e5e5;
  --color-nav-bg:       rgb(108, 204, 21);
  --color-nav-text:     #ffffff;
  --color-nav-hover:    rgba(255, 255, 255, 0.25);
  --color-footer-bg:    rgb(108, 204, 21);
  --color-footer-text:  #ffffff;
  --color-btn-primary-bg:   #ffffff;
  --color-btn-primary-text: rgb(85, 165, 15);
  --color-btn-outline-bg:   transparent;
  --color-btn-outline-text: #ffffff;
  --color-btn-outline-border: rgba(255,255,255,0.7);
  --shadow-card: 0 2px 12px rgba(0,0,0,0.07);
  --shadow-nav:  0 2px 8px rgba(0,0,0,0.12);
}

/* ---- Dark Mode -------------------------------------------- */
[data-theme="dark"] {
  --color-bg:           #1a1a1a;
  --color-bg-alt:       #222222;
  --color-text:         #e8e8e8;
  --color-text-muted:   #aaaaaa;
  --color-card-bg:      #2a2a2a;
  --color-card-border:  #3a3a3a;
  --color-border:       #3a3a3a;
  --color-btn-primary-bg:   #ffffff;
  --color-btn-primary-text: rgb(85, 165, 15);
  --shadow-card: 0 2px 12px rgba(0,0,0,0.3);
  --shadow-nav:  0 2px 8px rgba(0,0,0,0.4);
}

/* ---- Reset & Base ----------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: Roboto, "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 400;
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

h1, h2, h3, h4 {
  font-family: Lato, "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 700;
  line-height: 1.2;
}

a {
  color: var(--color-brand-dark);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

/* ---- Layout utilities ------------------------------------- */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-alt {
  background-color: var(--color-bg-alt);
}

.section-title {
  font-size: 2.4rem;
  text-align: center;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.section-subtitle {
  font-size: 1.1rem;
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: 3rem;
  font-weight: 300;
}

/* Full-width override for navbar and footer */
.navbar .container,
.footer .container {
  max-width: none;
  padding: 0 24px;
}

/* ---- Navbar ----------------------------------------------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--color-nav-bg);
  transition: box-shadow 0.3s ease;
}

.navbar.scrolled {
  box-shadow: var(--shadow-nav);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.navbar-brand img {
  height: 32px;
  width: auto;
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.navbar-nav a {
  color: var(--color-nav-text);
  text-decoration: none;
  font-size: 12px;
  font-weight: 300;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 6px 10px;
  border-radius: 4px;
  transition: background-color 0.2s ease;
}

.navbar-nav a:hover,
.navbar-nav a.active {
  background-color: var(--color-nav-hover);
  text-decoration: none;
}

/* Dark mode toggle button */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-nav-text);
  padding: 6px 10px;
  border-radius: 4px;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s ease;
  margin-left: 8px;
}

.theme-toggle:hover {
  background-color: var(--color-nav-hover);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
.icon-sun { display: none; }
.icon-moon { display: block; }

/* Mobile menu */
.navbar-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  color: var(--color-nav-text);
}

.navbar-toggle svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

/* ---- Hero ------------------------------------------------- */
.hero {
  background-color: var(--color-bg-hero);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 100px 24px 60px;
}

.hero-content {
  max-width: 700px;
  margin: 0 auto;
}

.hero-logo {
  width: 130px;
  height: auto;
  margin: 0 auto 28px;
  filter: drop-shadow(0 4px 12px rgba(0,0,0,0.15));
}

.hero-title {
  font-size: 2.6rem;
  color: #ffffff;
  margin-bottom: 1rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 2.5rem;
  font-weight: 300;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 6px;
  font-family: Roboto, sans-serif;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.1s ease;
  white-space: nowrap;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background-color: var(--color-btn-primary-bg);
  color: var(--color-btn-primary-text);
  border-color: var(--color-btn-primary-bg);
}

.btn-primary:hover {
  background-color: #f0f0f0;
  border-color: #f0f0f0;
  color: var(--color-btn-primary-text);
}

.btn-outline {
  background-color: var(--color-btn-outline-bg);
  color: var(--color-btn-outline-text);
  border-color: var(--color-btn-outline-border);
}

.btn-outline:hover {
  background-color: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.9);
}

.btn svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
  flex-shrink: 0;
}

.btn-green {
  background-color: var(--color-brand);
  color: #ffffff;
  border-color: var(--color-brand);
}

.btn-green:hover {
  background-color: var(--color-brand-dark);
  border-color: var(--color-brand-dark);
  color: #ffffff;
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-text-muted);
  border-color: var(--color-border);
}

.btn-ghost:hover {
  background-color: var(--color-brand);
  border-color: var(--color-brand);
  color: #ffffff;
}

.hero-note {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.75);
}

/* ---- Overview --------------------------------------------- */
.overview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.overview-text h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.overview-text p {
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: 1rem;
}

.value-props {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.value-prop {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.value-prop-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background-color: var(--color-brand);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 9px;
}

.value-prop-icon svg {
  width: 22px;
  height: 22px;
  fill: #ffffff;
}

.value-prop-text strong {
  display: block;
  font-size: 0.95rem;
  color: var(--color-text);
  margin-bottom: 2px;
}

.value-prop-text span {
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

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

.feature-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: 10px;
  padding: 28px 24px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(0,0,0,0.11);
}

.feature-card:focus-visible {
  outline: 2px solid var(--color-brand);
  outline-offset: 2px;
}

.feature-card.active {
  border-color: var(--color-brand);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background-color: var(--color-brand);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  padding: 11px;
}

.feature-icon img {
  width: 26px;
  height: 26px;
  object-fit: contain;
}

.feature-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.feature-desc {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: 18px;
  flex: 1;
}

.feature-more-btn {
  border: 1px solid var(--color-brand);
  background-color: transparent;
  color: var(--color-brand-dark);
  border-radius: 8px;
  padding: 7px 14px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease;
  align-self: flex-start;
}

.feature-more-btn:hover {
  background-color: var(--color-brand);
  border-color: var(--color-brand);
  color: #ffffff;
}

.feature-card.active .feature-more-btn {
  background-color: var(--color-brand);
  border-color: var(--color-brand);
  color: #ffffff;
}

.feature-details-panel {
  width: 100%;
  grid-column: 1 / -1;
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: 12px;
  box-shadow: var(--shadow-card);
  padding: 26px 28px;
}

.feature-details-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.feature-details-title {
  font-size: 1.2rem;
  color: var(--color-text);
}

.feature-details-text {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.feature-details-list {
  list-style: disc;
  font-size: 0.9rem;
  margin: 0 0 0 18px;
  color: var(--color-text-muted);
}

.feature-details-list li {
  margin-bottom: 6px;
  line-height: 1.55;
}

.feature-doc-link {
  display: inline-flex;
  margin-top: 14px;
  border: 1px solid var(--color-brand);
  background-color: transparent;
  color: var(--color-brand-dark);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.7px;
  text-decoration: none;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.feature-doc-link:hover {
  background-color: var(--color-brand);
  border-color: var(--color-brand);
  color: #ffffff;
  text-decoration: none;
}

/* ---- Screenshots ------------------------------------------ */
.screenshots-section {
  background-color: var(--color-bg-alt);
}

.screenshots-scroll {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 0;
}

.screenshot-item {
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.12);
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
}

.screenshot-item img {
  width: 100%;
  height: auto;
  display: block;
}

.screenshot-caption {
  padding: 10px 16px;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  font-weight: 500;
  text-align: center;
}

/* ---- Download --------------------------------------------- */
.version-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 4px 14px;
  border-radius: 8px;
  margin-bottom: 2rem;
  letter-spacing: 0.5px;
  text-decoration: none;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.version-badge:hover {
  background-color: var(--color-brand);
  border-color: var(--color-brand);
  color: #ffffff;
  text-decoration: none;
}

.download-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.pricing-note {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.85);
  text-align: center;
  margin-bottom: 0.75rem;
}

.sysreq-note {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.65);
  text-align: center;
}

/* ---- Pricing ---------------------------------------------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 760px;
  margin: 0 auto;
}

.pricing-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: 12px;
  padding: 36px 28px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
}

.pricing-card.featured {
  border-color: var(--color-brand);
  border-width: 2px;
  position: relative;
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-brand);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  padding: 4px 14px;
  border-radius: 20px;
  white-space: nowrap;
}

.pricing-tier {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-brand-dark);
  margin-bottom: 12px;
}

.pricing-price {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1;
  margin-bottom: 4px;
  font-family: Lato, sans-serif;
}

.pricing-price-sub {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.pricing-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin-bottom: 20px;
}

.pricing-features {
  list-style: none;
  margin-bottom: 8px;
  flex: 1;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin-bottom: 10px;
}

.pricing-features li::before {
  content: '';
  display: inline-block;
  width: 16px;
  height: 16px;
  background-color: var(--color-brand);
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 2px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='white' d='M6.5 11.5L3 8l1-1 2.5 2.5 5-5 1 1z'/%3E%3C/svg%3E");
  background-size: contain;
}

.pricing-note-bottom {
  text-align: center;
  margin-top: 2rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ---- Documentation ---------------------------------------- */
.doc-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 700px;
  margin: 0 auto;
}

.doc-card {
  display: flex;
  align-items: center;
  gap: 18px;
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: 10px;
  padding: 24px;
  text-decoration: none;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  color: var(--color-text);
}

.doc-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.1);
  text-decoration: none;
  color: var(--color-text);
}

.doc-card-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background-color: var(--color-brand);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
}

.doc-card-icon svg {
  width: 24px;
  height: 24px;
  fill: #ffffff;
}

.doc-card-label {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 3px;
  color: var(--color-text);
}

.doc-card-desc {
  font-size: 0.83rem;
  color: var(--color-text-muted);
}

.doc-note {
  text-align: center;
  margin-top: 2rem;
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

/* ---- Footer ----------------------------------------------- */
.footer {
  background-color: var(--color-footer-bg);
  color: var(--color-footer-text);
  height: 56px;
  display: flex;
  align-items: center;
}

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

.footer-logo img {
  height: 40px;
  width: auto;
}

.footer-right a {
  color: rgba(255,255,255,0.85);
  font-size: 0.9rem;
  font-weight: 400;
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 4px;
  transition: background-color 0.2s ease;
}

.footer-right a:hover {
  background-color: var(--color-nav-hover);
  color: #ffffff;
  text-decoration: none;
}

/* ---- Responsive ------------------------------------------- */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .screenshots-scroll {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 1.9rem;
  }

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

  .hero-subtitle {
    font-size: 1rem;
  }

  .overview-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .screenshots-scroll {
    grid-template-columns: 1fr;
  }

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

  .footer-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    flex-wrap: nowrap;
    text-align: left;
  }

  /* Mobile nav */
  .navbar-nav {
    display: none;
    flex-direction: column;
    gap: 6px;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background-color: var(--color-nav-bg);
    box-shadow: var(--shadow-nav);
    padding: 8px 6px;
  }

  .navbar-nav.open {
    display: flex;
  }

  .navbar-nav a {
    padding: 10px 16px;
    border-radius: 6px;
    width: auto;
    display: block;
  }

  .navbar-toggle {
    display: flex;
  }

  .navbar-right {
    display: flex;
    align-items: center;
  }
}

@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .pricing-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .download-buttons {
    flex-direction: column;
    align-items: center;
  }
}