/* GrayCalc Marketing Styles */
:root {
  --font-sans: 'Inter', system-ui, sans-serif;
  --font-mono: 'Roboto Mono', monospace;
  --clr-bg: #ffffff;
  --clr-text: #111827;
  --clr-accent: #1e40af;
  --clr-accent-dark: #1e3a8a;
  --clr-accent-light: #dbeafe;
  --clr-gray-100: #f3f4f6;
  --clr-gray-200: #e5e7eb;
  --clr-gray-500: #6b7280;
}

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

body {
  font-family: var(--font-sans);
  color: var(--clr-text);
  background: var(--clr-bg);
  line-height: 1.6;
}

.container {
  width: min(92%, 1200px);
  margin-inline: auto;
}

/* Header / Navigation */
.site-header {
  background: var(--clr-bg);
  border-bottom: 1px solid var(--clr-gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0;
}

.logo {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--clr-text);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--clr-text);
  font-weight: 500;
  transition: color .15s;
  padding-inline: 1rem;
}

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

.btn {
  display: inline-block;
  padding: 0.65rem 1.2rem;
  border-radius: 6px;
  font-weight: 600;
  text-decoration: none;
  transition: background .2s, box-shadow .2s;
  padding-inline: 1rem;
}

.btn-primary {
  background: var(--clr-accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--clr-accent-dark);
}

.btn-outline {
  border: 2px solid var(--clr-accent);
  color: var(--clr-accent);
}

.btn-outline:hover {
  background: var(--clr-accent);
  color: #fff;
}

/* Burger icon visible on small screens */
#nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

@media (max-width: 640px) {
  #nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 64px; /* height of header */
    right: 0;
    background: var(--clr-bg);
    flex-direction: column;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    width: 220px;
    box-shadow: 0 6px 24px rgba(0,0,0,0.08);
    transform: translateX(100%);
    transition: transform .25s ease;
  }
  .nav-links.open { transform: translateX(0); }
  .container { width: 94%; }
  .nav-links a, .btn { padding-inline: 0.9rem; }
}

/* Hero */
.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2rem;
  padding: 4rem 0 6rem;
  padding-left: 1rem;
  padding-right: 1rem;
}

.hero-content {
  flex: 1 1 500px;
}

.hero h1 {
  font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
  line-height: 1.2;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
}

.gradient {
  background: linear-gradient(90deg, #1e40af, #3b82f6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  max-width: 45ch;
  margin-bottom: 2rem;
  font-size: 1.125rem;
  color: var(--clr-gray-500);
}

.hero-graphic {
  flex: 1 1 500px;
  text-align: center;
}

.hero-graphic img {
  max-width: 100%;
  border-radius: 0 0 12px 12px;
}

.browser-window {
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0,0,0,.1), 0 2px 8px rgba(0,0,0, .05);
  border: 1px solid var(--clr-gray-200);
}

.browser-header {
  height: 36px;
  background: var(--clr-gray-100);
  border-bottom: 1px solid var(--clr-gray-200);
  border-radius: 12px 12px 0 0;
  display: flex;
  align-items: center;
  padding: 0 12px;
}

.dots {
  display: flex;
  gap: 6px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--clr-gray-200);
}

/* Features */
.features {
  background: var(--clr-gray-100);
  padding: 4rem 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.feature h3 {
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
}

/* Pricing */
.pricing {
  padding: 4rem 0 6rem;
}

.pricing-content h2 {
  text-align: center;
  font-size: 2rem;
  font-family: var(--font-mono);
  margin-bottom: 2.5rem;
}

.pricing-table {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
}

.plan {
  background: #fff;
  border: 1px solid var(--clr-gray-200);
  border-radius: 12px;
  padding: 2rem 1.5rem;
  min-width: 280px;
  text-align: center;
  box-shadow: 0 4px 12px rgba(0,0,0,.05);
  transition: all .2s;
}

.plan-pro {
  border-color: var(--clr-accent);
  transform: scale(1.05);
}

.plan h3 {
  margin-bottom: .75rem;
  font-family: var(--font-mono);
}

.price {
  font-size: 2rem;
  margin-bottom: 1rem;
  font-weight: 700;
}

.period {
  font-size: 1rem;
  font-weight: 500;
  color: var(--clr-gray-500);
}

.plan ul {
  list-style: none;
  margin-bottom: 1.5rem;
}

.plan ul li {
  margin: 0.25rem 0;
}

/* Footer */
.site-footer {
  background: var(--clr-bg);
  border-top: 1px solid var(--clr-gray-200);
  padding: 1.5rem 0;
  font-size: 0.9rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Hero padding edge on mobile */
@media (max-width: 640px) {
  .hero { padding: 3rem 0 4rem; }
  .container { width: 94%; }
}