/* ==========================================================================
   Chopra AgriBot — Design System
   Primary: #1B4332 | Accent: #D4A017 | Background: #F5F0E8
   ========================================================================== */

:root {
  --green-deep: #1B4332;
  --green-mid: #2D6A4F;
  --green-light: #40916C;
  --gold: #D4A017;
  --gold-light: #E8C547;
  --cream: #F5F0E8;
  --cream-dark: #E8E0D4;
  --text: #1a1a1a;
  --text-muted: #4a4a4a;
  --night-bg: #0d1f17;
  --night-card: #142820;
  --shadow: 0 4px 24px rgba(27, 67, 50, 0.08);
  --shadow-lg: 0 12px 48px rgba(27, 67, 50, 0.12);
  --radius: 12px;
  --radius-lg: 20px;
  --font-display: "Playfair Display", Georgia, serif;
  --font-body: "DM Sans", system-ui, sans-serif;
  --nav-height: 72px;
  --transition: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--cream);
  -webkit-font-smoothing: antialiased;
}

body.nav-open {
  overflow: hidden;
}

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

a {
  color: var(--green-deep);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--gold);
}

.container {
  width: min(1120px, 92vw);
  margin-inline: auto;
}

/* Typography */
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--green-deep);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  letter-spacing: -0.02em;
}

h2.section__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  text-align: center;
  margin-bottom: 0.5rem;
}

h3 {
  font-size: 1.2rem;
}

.section__lead {
  text-align: center;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 2.5rem;
  font-size: 1.05rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 999px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--gold {
  background: var(--gold);
  color: var(--green-deep);
  border-color: var(--gold);
  box-shadow: 0 4px 16px rgba(212, 160, 23, 0.35);
}

.btn--gold:hover {
  background: var(--gold-light);
  color: var(--green-deep);
}

.btn--outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.6);
}

.btn--outline:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.btn--sm {
  padding: 0.55rem 1.25rem;
  font-size: 0.875rem;
}

.btn--full {
  width: 100%;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(245, 240, 232, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(27, 67, 50, 0.08);
  height: var(--nav-height);
}

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

.navbar__logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.06em;
  color: var(--green-deep);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.logo-mark {
  color: var(--gold);
  font-size: 0.75rem;
}

.navbar__nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.navbar__nav a:not(.btn) {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
}

.navbar__nav a:not(.btn):hover {
  color: var(--green-deep);
}

.nav-toggle {
  display: none;
}

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

.nav-toggle-label span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--green-deep);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* Hero */
.hero {
  position: relative;
  min-height: calc(100vh - var(--nav-height));
  min-height: calc(100dvh - var(--nav-height));
  display: flex;
  align-items: center;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(13, 31, 23, 0.92) 0%, rgba(27, 67, 50, 0.85) 45%, rgba(45, 106, 79, 0.75) 100%),
    radial-gradient(ellipse at 70% 80%, rgba(212, 160, 23, 0.12) 0%, transparent 50%),
    var(--green-deep);
  color: #fff;
}

.hero__particles {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(212, 160, 23, 0.15) 1px, transparent 1px),
    radial-gradient(circle at 60% 70%, rgba(255, 255, 255, 0.06) 1px, transparent 1px),
    radial-gradient(circle at 80% 20%, rgba(212, 160, 23, 0.1) 1px, transparent 1px);
  background-size: 80px 80px, 120px 120px, 60px 60px;
  animation: drift 40s linear infinite;
  pointer-events: none;
}

@keyframes drift {
  0% { background-position: 0 0, 0 0, 0 0; }
  100% { background-position: 80px 80px, -120px 120px, 60px -60px; }
}

.hero__robot {
  position: absolute;
  right: 8%;
  bottom: 15%;
  width: min(280px, 40vw);
  color: #fff;
  animation: float 6s ease-in-out infinite;
  opacity: 0.9;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-16px); }
}

.robot-svg {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 8px 32px rgba(212, 160, 23, 0.25));
}

.hero__content {
  position: relative;
  z-index: 2;
  padding: 4rem 0;
  max-width: 720px;
}

.hero__eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1rem;
}

.hero h1 {
  color: #fff;
  margin-bottom: 1.25rem;
}

.hero__sub {
  font-size: 1.1rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.88);
  margin-bottom: 2rem;
}

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Sections */
.section {
  padding: 5rem 0;
}

.section--alt {
  background: var(--cream-dark);
}

.section--problem {
  background: var(--cream);
}

/* Cards */
.cards {
  display: grid;
  gap: 1.5rem;
}

.cards--3 {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
  background: #fff;
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  border: 1px solid rgba(27, 67, 50, 0.06);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.pain-card .card__icon {
  color: var(--green-mid);
  margin-bottom: 1rem;
}

.pain-card h3 {
  margin-bottom: 0.75rem;
}

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

/* Features grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.feature-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 1.75rem;
  border: 1px solid rgba(27, 67, 50, 0.08);
  box-shadow: var(--shadow);
  transition: border-color var(--transition), transform var(--transition);
}

.feature-card:hover {
  border-color: var(--gold);
  transform: translateY(-3px);
}

.feature-card__icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 1rem;
}

.feature-card h3 {
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Timeline */
.timeline {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 2rem;
  left: 16%;
  right: 16%;
  height: 2px;
  background: linear-gradient(90deg, var(--green-deep), var(--gold), var(--green-deep));
  z-index: 0;
}

.timeline__step {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 0 1rem;
}

.timeline__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 4rem;
  height: 4rem;
  border-radius: 50%;
  background: var(--green-deep);
  color: var(--gold);
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  box-shadow: 0 4px 20px rgba(27, 67, 50, 0.25);
}

.timeline__step h3 {
  margin-bottom: 0.5rem;
}

.timeline__step p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Stats bar */
.stats-bar {
  background: var(--green-deep);
  color: #fff;
  padding: 2.5rem 0;
}

.stats-bar__inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  text-align: center;
}

.stat strong {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--gold);
  margin-bottom: 0.25rem;
}

.stat span {
  font-size: 0.85rem;
  opacity: 0.9;
  letter-spacing: 0.02em;
}

/* Dual farm */
.dual-farm {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.dual-farm__col {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  border: 2px solid rgba(27, 67, 50, 0.1);
  box-shadow: var(--shadow);
}

.dual-farm__col--crop {
  border-color: var(--gold);
  background: linear-gradient(160deg, #fff 0%, rgba(212, 160, 23, 0.06) 100%);
}

.dual-farm__badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--green-deep);
  background: rgba(27, 67, 50, 0.08);
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}

.dual-farm__badge--gold {
  background: rgba(212, 160, 23, 0.2);
  color: var(--green-deep);
}

.dual-farm__col h3 {
  margin-bottom: 1.25rem;
}

.dual-farm__col ul {
  list-style: none;
}

.dual-farm__col li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.dual-farm__col li::before {
  content: "◆";
  position: absolute;
  left: 0;
  color: var(--gold);
  font-size: 0.6rem;
  top: 0.35rem;
}

/* Night section */
.section--night {
  position: relative;
  background: var(--night-bg);
  color: #fff;
  overflow: hidden;
  padding: 6rem 0;
}

.section--night__inner {
  position: relative;
  z-index: 2;
  text-align: center;
}

.night-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(212, 160, 23, 0.2) 0%, transparent 70%);
  pointer-events: none;
  animation: pulse-glow 4s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 0.6; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 1; transform: translate(-50%, -50%) scale(1.08); }
}

.section__title--light,
.section__lead--light {
  color: #fff;
}

.section__lead--light {
  opacity: 0.85;
}

.night-features {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem 2rem;
  margin-top: 2rem;
}

.night-features li {
  font-size: 0.95rem;
  padding: 0.6rem 1.25rem;
  background: var(--night-card);
  border: 1px solid rgba(212, 160, 23, 0.25);
  border-radius: 999px;
  color: var(--gold-light);
}

/* Benefits */
.benefits-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.benefits-header .section__title {
  text-align: left;
  margin-bottom: 0;
}

.lang-toggle {
  display: flex;
  border: 2px solid var(--green-deep);
  border-radius: 999px;
  overflow: hidden;
}

.lang-toggle__btn {
  padding: 0.45rem 1.1rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  border: none;
  background: transparent;
  color: var(--green-deep);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.lang-toggle__btn--active {
  background: var(--green-deep);
  color: var(--cream);
}

.acre-note {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  font-size: 1.05rem;
}

.acre-note strong {
  color: var(--green-deep);
}

.testimonials {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.testimonial {
  background: #fff;
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow);
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.testimonial__avatar {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--green-deep);
  color: var(--gold);
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.testimonial blockquote p {
  font-size: 0.92rem;
  color: var(--text);
  margin-bottom: 0.75rem;
  font-style: italic;
}

.testimonial footer {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.testimonial cite {
  font-style: normal;
  color: var(--green-mid);
  font-weight: 600;
}

/* Contact form */
.form-error {
  max-width: 560px;
  margin: 0 auto 1.25rem;
  padding: 0.85rem 1.1rem;
  background: rgba(180, 40, 40, 0.08);
  border: 1px solid rgba(180, 40, 40, 0.35);
  border-radius: 8px;
  color: #8b2020;
  font-size: 0.9rem;
  font-weight: 500;
  text-align: center;
}

.form-row--recaptcha {
  display: flex;
  justify-content: center;
}

.contact-form {
  max-width: 560px;
  margin: 0 auto;
  background: #fff;
  padding: 2.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(27, 67, 50, 0.08);
}

.form-row {
  margin-bottom: 1.25rem;
}

.form-row--half {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-row label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--green-deep);
  margin-bottom: 0.4rem;
}

.form-hint {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-body);
  font-size: 1rem;
  border: 2px solid var(--cream-dark);
  border-radius: 8px;
  background: var(--cream);
  color: var(--text);
  transition: border-color var(--transition);
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--green-mid);
}

.contact-form textarea {
  resize: vertical;
  min-height: 100px;
}

/* Footer */
.footer {
  background: var(--green-deep);
  color: rgba(255, 255, 255, 0.85);
  padding: 3rem 0 2rem;
}

.footer__inner {
  display: grid;
  gap: 1.5rem;
  text-align: center;
}

.footer__logo {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #fff;
  font-size: 1rem;
}

.footer__tagline {
  margin-top: 0.35rem;
  font-size: 0.9rem;
  opacity: 0.9;
}

.footer__links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.footer__links a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.9rem;
}

.footer__links a:hover {
  color: var(--gold);
}

.footer__copy {
  font-size: 0.8rem;
  opacity: 0.6;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Responsive */
@media (max-width: 900px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .timeline {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .timeline::before {
    display: none;
  }

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

  .dual-farm {
    grid-template-columns: 1fr;
  }

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

  .hero__robot {
    opacity: 0.4;
    right: -5%;
  }
}

@media (max-width: 768px) {
  .nav-toggle-label {
    display: flex;
  }

  .navbar__nav {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--cream);
    padding: 1.5rem;
    transform: translateX(100%);
    transition: transform var(--transition);
    border-top: 1px solid rgba(27, 67, 50, 0.1);
  }

  .navbar__nav a {
    padding: 1rem 0;
    border-bottom: 1px solid rgba(27, 67, 50, 0.06);
    font-size: 1.1rem;
  }

  .navbar__nav .btn {
    margin-top: 1rem;
    text-align: center;
  }

  #nav-toggle:checked ~ .navbar__nav {
    transform: translateX(0);
  }

  #nav-toggle:checked + .nav-toggle-label span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  #nav-toggle:checked + .nav-toggle-label span:nth-child(2) {
    opacity: 0;
  }

  #nav-toggle:checked + .nav-toggle-label span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

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

  .form-row--half {
    grid-template-columns: 1fr;
  }

  .benefits-header {
    flex-direction: column;
    align-items: center;
  }

  .benefits-header .section__title {
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero__ctas {
    flex-direction: column;
  }

  .hero__ctas .btn {
    width: 100%;
  }

  .stats-bar__inner {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}