:root {
  --wa-deep: #075E54;
  --wa-teal: #128C7E;
  --wa-mint: #25D366;
  --wa-sand: #ECE5DD;
  --wa-white: #FFFFFF;
  --wa-ink: #1f2a28;
  --wa-muted: #4a5c58;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--wa-ink);
  background: var(--wa-sand);
  font-family: system-ui, "Segoe UI", sans-serif;
  line-height: 1.75;
}

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

a {
  color: var(--wa-teal);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--wa-white);
  border-bottom: 1px solid #d7ebe6;
}

.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--wa-deep);
  text-decoration: none;
  font-weight: 700;
  white-space: nowrap;
}

.brand svg,
.wa-logo {
  display: block;
  flex: 0 0 auto;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
}

.site-nav a {
  color: var(--wa-teal);
  text-decoration: none;
  padding: 0.15rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.site-nav a:hover,
.site-nav a:focus {
  color: var(--wa-deep);
  border-bottom-color: var(--wa-mint);
}

.hero {
  background: linear-gradient(180deg, #0b6b60 0%, var(--wa-deep) 58%, #064940 100%);
  color: var(--wa-white);
}

.hero-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 3.4rem 1.25rem 3.6rem;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.4rem;
  align-items: center;
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.9rem, 3vw, 2.7rem);
  line-height: 1.25;
}

.hero p {
  margin: 0 0 1rem;
  color: #e8f6f2;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.4rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.72rem 1.15rem;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 650;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.btn-primary {
  background: var(--wa-mint);
  color: #06352f;
}

.btn-primary:hover,
.btn-primary:focus {
  background: #1ebe5c;
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--wa-white);
  border: 1px solid rgba(255, 255, 255, 0.45);
}

.btn-ghost:hover,
.btn-ghost:focus {
  background: rgba(255, 255, 255, 0.1);
}

.browser-frame {
  background: #f4f7f6;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.22);
  color: var(--wa-ink);
}

.browser-bar {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.65rem 0.8rem;
  background: #dfe8e5;
}

.browser-bar .lights {
  display: flex;
  gap: 0.32rem;
}

.browser-bar .lights span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #c5d2ce;
}

.browser-url {
  flex: 1;
  background: #fff;
  border-radius: 8px;
  padding: 0.28rem 0.6rem;
  font-size: 0.82rem;
  color: var(--wa-teal);
}

.browser-body {
  display: grid;
  grid-template-columns: 42% 58%;
  min-height: 250px;
}

.mock-list {
  background: #fff;
  border-right: 1px solid #e4eeea;
  padding: 0.7rem 0.55rem;
}

.mock-row {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 0.45rem;
  align-items: center;
  padding: 0.42rem 0.3rem;
  border-radius: 8px;
}

.mock-row + .mock-row {
  margin-top: 0.2rem;
}

.mock-row.active {
  background: #e8f8ef;
}

.mock-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #cde8df;
}

.mock-line {
  height: 7px;
  border-radius: 99px;
  background: #d5e3de;
}

.mock-line.short {
  width: 58%;
  margin-top: 0.28rem;
  background: #e4eeea;
}

.mock-chat {
  background: #ece5dd;
  padding: 0.9rem 0.75rem;
}

.mock-bubble {
  max-width: 78%;
  padding: 0.45rem 0.6rem;
  border-radius: 8px;
  background: #fff;
  min-height: 2.1rem;
}

.mock-bubble.out {
  margin-left: auto;
  background: #d9fdd3;
}

.mock-bubble + .mock-bubble {
  margin-top: 0.5rem;
}

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 3rem 1.25rem;
}

.section h2 {
  margin: 0 0 0.85rem;
  color: var(--wa-deep);
  font-size: 1.7rem;
}

.lead {
  margin: 0 0 1.3rem;
  color: var(--wa-muted);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  background: var(--wa-white);
  border-radius: 16px;
  padding: 1.2rem 1.15rem 1.3rem;
  box-shadow: 0 8px 24px rgba(7, 94, 84, 0.08);
}

.card h3 {
  margin: 0.7rem 0 0.6rem;
  color: var(--wa-deep);
  font-size: 1.12rem;
}

.card p {
  margin: 0 0 0.75rem;
  color: var(--wa-muted);
}

.icon-badge {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: #e7f7ee;
  color: var(--wa-teal);
}

.prose p {
  margin: 0 0 1rem;
}

.prose ol,
.prose ul {
  margin: 0 0 1rem;
  padding-left: 1.2rem;
}

.prose li + li {
  margin-top: 0.45rem;
}

.steps {
  display: grid;
  gap: 0.9rem;
}

.step {
  background: var(--wa-white);
  border-radius: 14px;
  padding: 1rem 1.1rem;
  border-left: 5px solid var(--wa-mint);
}

.step h3 {
  margin: 0 0 0.45rem;
  color: var(--wa-deep);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.panel {
  background: var(--wa-white);
  border-radius: 14px;
  padding: 1.1rem 1.15rem;
}

.panel h3 {
  margin: 0 0 0.55rem;
  color: var(--wa-deep);
}

.compare {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.compare article {
  background: var(--wa-white);
  border-radius: 14px;
  padding: 1.1rem 1.15rem;
}

.compare h3 {
  margin: 0 0 0.55rem;
  color: var(--wa-deep);
}

.faq details {
  background: var(--wa-white);
  border-radius: 12px;
  padding: 0.9rem 1rem;
}

.faq details + details {
  margin-top: 0.7rem;
}

.faq summary {
  cursor: pointer;
  color: var(--wa-deep);
  font-weight: 700;
}

.faq p {
  margin: 0.7rem 0 0;
  color: var(--wa-muted);
}

.site-footer {
  background: var(--wa-deep);
  color: #d7efe9;
  padding: 2rem 1.25rem 2.4rem;
}

.site-footer .wrap {
  padding: 0;
}

.site-footer p {
  margin: 0 0 0.75rem;
}

@media (max-width: 900px) {
  .hero-inner,
  .card-grid,
  .split,
  .compare,
  .browser-body {
    grid-template-columns: 1fr;
  }

  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}