:root {
  --green: #4c9a92;
  --gray: #a7c8bd;
  --white: #ffecc5;
  --yellow: #f8d281;
  --black: #3e3e3e;
}

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

body {
  font-family: "Rethink Sans", sans-serif;
  background-color: #fff;
  color: var(--black);
  line-height: 1.6;
}

/* Navbar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.2rem 6%;
  background-color: white;
  border-bottom: 1px solid #e5e5e5;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.logo {
  height: 36px;
}

.brand {
  font-weight: 700;
  color: var(--green);
}

nav a {
  margin-left: 2rem;
  text-decoration: none;
  color: var(--black);
  font-weight: 500;
  transition: color 0.2s;
}

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

/* Hero */
#hero {
  background: linear-gradient(120deg, var(--gray), var(--white));
  padding: 8rem 10%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--black);
}

.hero-content {
  max-width: 720px;
}

.hero-title {
  font-size: 2.8rem;
  font-weight: 700;
  margin-bottom: 1rem;
  animation: fadeInUp 1s ease-out;
}

.hero-sub {
  font-size: 1.15rem;
  margin-bottom: 2.5rem;
  color: #444;
  animation: fadeInUp 1.4s ease-out;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  animation: fadeInUp 1.8s ease-out;
}

.btn {
  padding: 0.9rem 1.8rem;
  border-radius: 40px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
}

.btn.primary {
  background-color: var(--green);
  color: white;
}

.btn.primary:hover {
  background-color: var(--black);
}

.btn.secondary {
  border: 2px solid var(--green);
  color: var(--green);
}

.btn.secondary:hover {
  background-color: var(--green);
  color: white;
}

/* Demo button in navbar */
.navbar .btn.demo {
  margin-left: 18px;
  padding: 0.55rem 0.95rem;
  border-radius: 12px;
  background: #3eb392;
  color: white;
  font-weight: 700;
  box-shadow: 0 8px 20px rgba(46, 64, 83, 0.08);
  border: none;
}
.navbar .btn.demo:hover { transform: translateY(-2px); }

/* Sections */
section {
  padding: 6rem 10%;
  text-align: center;
}

h2 {
  font-size: 2rem;
  margin-bottom: 1.2rem;
  color: var(--black);
}

p {
  color: #555;
  max-width: 700px;
  margin: 0 auto;
  font-size: 1.05rem;
}

/* Features */
.features-grid {
  margin-top: 3rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.8rem;
}

.feature-card {
  background-color: #fff;
  border: 1px solid #eaeaea;
  padding: 2rem;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.1);
}

.feature-card h3 {
  color: var(--green);
  font-size: 1.3rem;
  margin-bottom: 0.8rem;
}

#contact {
  background: var(--gray);
  /* give a little breathing room under the contact area */
  padding-bottom: 3rem;
}

/* space between the paragraph and the email button */
#contact .btn {
  display: inline-block; /* allow margin to apply reliably */
  margin-top: 1.25rem;
}

footer {
  text-align: center;
  padding: 2rem;
  background-color: var(--black);
  color: #ffffff;
  font-size: 0.95rem;
}

/* ensure footer descendants (paragraphs, links) render white for contrast */
footer p,
footer a,
footer span {
  color: #ffffff;
}

footer a {
  color: rgba(255,255,255,0.92);
  text-decoration: none;
}

footer a:hover { text-decoration: underline; color: #ffffff; }

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}