:root {
  --bg: #f8fafc;
  --text: #111827;
  --muted: #4b5563;
  --line: #d1d5db;
  --surface: #ffffff;
  --brand: #0f766e;
  --brand-soft: #ecfdf5;
  --brand-light: #14b8a6;
  --shadow-sm: 0 1px 3px rgba(17, 24, 39, 0.08);
  --shadow-md: 0 4px 12px rgba(17, 24, 39, 0.12);
  --shadow-lg: 0 10px 24px rgba(17, 24, 39, 0.15);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  width: min(1000px, 92vw);
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  background: rgba(248, 250, 252, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 0;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.brand,
.topbar a {
  color: var(--brand);
  text-decoration: none;
  font-weight: 700;
  transition: all 0.2s ease;
}

.brand:hover,
.topbar a:hover {
  color: var(--brand-light);
  transform: translateY(-1px);
}

.topbar nav {
  display: flex;
  gap: 0.9rem;
  align-items: center;
}

.nav-cta {
  background: var(--brand);
  color: white !important;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.nav-cta:hover {
  background: var(--brand-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.hero {
  padding: 3rem 0 1.5rem;
}

.kicker {
  color: var(--brand);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin: 0;
}

h1 {
  margin: 0.4rem 0 0.9rem;
  line-height: 1.15;
  font-size: clamp(1.9rem, 4vw, 3rem);
  background: linear-gradient(135deg, var(--text) 0%, var(--brand) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  margin: 0 0 0.9rem;
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  position: relative;
  display: inline-block;
}

h2::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 50px;
  height: 3px;
  background: linear-gradient(90deg, var(--brand) 0%, var(--brand-light) 100%);
  border-radius: 2px;
}

h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.intro {
  color: var(--muted);
  max-width: 75ch;
}

.section {
  padding: 1.4rem 0 2rem;
}

.section-alt {
  background: #eef2f7;
  border-block: 1px solid var(--line);
}

.module,
.panel,
.controls-list > div,
.cta-inner {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  transition: all 0.3s ease;
}

.module:hover,
.panel:hover,
.controls-list > div:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--brand);
}

.module + .module {
  margin-top: 0.75rem;
}

.module ul {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--muted);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.panel p,
.controls-list p {
  color: var(--muted);
  margin: 0;
}

.controls-list {
  display: grid;
  gap: 0.75rem;
}

.cta {
  padding-bottom: 3rem;
}

.cta-inner {
  background: linear-gradient(135deg, var(--brand-soft) 0%, rgba(16, 185, 129, 0.05) 100%);
  border: 2px solid var(--brand);
  text-align: center;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  font-weight: 700;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.5s, height 0.5s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-light) 100%);
  color: #fff;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--brand-light) 0%, var(--brand) 100%);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.btn-ghost {
  background: white;
  color: var(--brand);
  border: 2px solid var(--brand);
}

.btn-ghost:hover {
  background: var(--brand);
  color: white;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.detail-footer {
  background: var(--surface);
  border-top: 1px solid var(--line);
  padding: 2rem 0;
}

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

.footer-nav {
  display: flex;
  gap: 1.5rem;
}

.footer-nav a {
  color: var(--brand);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.2s ease;
}

.footer-nav a:hover {
  color: var(--brand-light);
  transform: translateY(-1px);
}

@media (max-width: 820px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .topbar nav {
    width: 100%;
    flex-wrap: wrap;
  }
}