:root {
  --bg: #0d1117;
  --bg2: #161b22;
  --bg3: #21262d;
  --border: rgba(255, 255, 255, 0.08);
  --border-em: rgba(255, 255, 255, 0.15);
  --text: #e6edf3;
  --text2: #8b949e;
  --text3: #6e7681;
  --teal: #5dcaa5;
  --teal-dark: #082820;
  --teal-bg: rgba(93, 202, 165, 0.1);
  --teal-border: rgba(93, 202, 165, 0.35);
  --purple: #7f77dd;
  --radius: 10px;
  --radius-lg: 16px;
  --font: "DM Sans", system-ui, -apple-system, sans-serif;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
  --max-w: 1280px;

  /* Typography scale */
  --text-xs: 13px;
  --text-sm: 15px;
  --text-base: 18px;
  --text-md: 20px;
  --text-lg: 22px;
  --text-xl: 28px;
  --text-2xl: 36px;
  --text-3xl: 52px;
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

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

a {
  color: inherit;
  text-decoration: none;
}

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

.container {
  width: min(100% - 48px, var(--max-w));
  margin-inline: auto;
}

/* ── Header ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 84px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--teal) 0%, #0f6e56 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.brand-icon-sm {
  width: 40px;
  height: 40px;
  font-size: 14px;
}

.brand-name {
  font-size: var(--text-md);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.brand-tag {
  font-size: var(--text-sm);
  color: var(--text3);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav a:not(.btn) {
  padding: 10px 14px;
  font-size: var(--text-sm);
  color: var(--text2);
  border-radius: var(--radius);
  transition: color 0.15s, background 0.15s;
}

.nav a:not(.btn):hover {
  color: var(--text);
  background: var(--bg3);
}

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

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text2);
  border-radius: 1px;
  transition: transform 0.2s, opacity 0.2s;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  border-radius: var(--radius);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: inherit;
  border: 1px solid transparent;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.15s, background 0.15s;
  white-space: nowrap;
}

.btn:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--teal);
  color: var(--teal-dark);
}

.btn-secondary {
  background: var(--bg3);
  color: var(--text);
  border-color: var(--border-em);
}

.btn-ghost {
  background: transparent;
  color: var(--text2);
  border-color: var(--border);
}

.btn-ghost:hover {
  color: var(--text);
  background: var(--bg3);
}

.btn-lg {
  padding: 16px 28px;
  font-size: var(--text-base);
}

/* ── Hero ── */
.hero {
  padding: 96px 0 112px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.eyebrow {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--teal);
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, var(--text-3xl));
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.lead {
  font-size: var(--text-md);
  color: var(--text2);
  max-width: 580px;
  margin-bottom: 36px;
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.hero-stats {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero-stats strong {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text);
}

.hero-stats span {
  font-size: var(--text-sm);
  color: var(--text3);
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.phone-mock {
  position: relative;
  z-index: 2;
  width: min(100%, 360px);
  background: #0b141a;
  border: 1px solid var(--border-em);
  border-radius: 32px;
  padding: 16px 16px 24px;
  box-shadow: var(--shadow);
}

.phone-notch {
  width: 96px;
  height: 7px;
  background: var(--bg3);
  border-radius: 4px;
  margin: 6px auto 20px;
}

.chat-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px 18px;
  border-bottom: 1px solid var(--border);
}

.chat-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--teal), #0f6e56);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
}

.chat-name {
  font-size: var(--text-sm);
  font-weight: 600;
}

.chat-status {
  font-size: var(--text-xs);
  color: var(--teal);
}

.chat-body {
  padding: 20px 10px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.bubble {
  max-width: 88%;
  padding: 12px 14px;
  border-radius: 14px;
  font-size: var(--text-sm);
  line-height: 1.5;
}

.bubble-in {
  align-self: flex-start;
  background: var(--bg3);
  border-bottom-left-radius: 4px;
}

.bubble-out {
  align-self: flex-end;
  background: #005c4b;
  color: #e9edef;
  border-bottom-right-radius: 4px;
}

.bubble-meta {
  margin-top: 8px;
  font-size: var(--text-xs);
  color: var(--text3);
}

.bubble-confirm {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--teal-bg);
  border: 1px solid var(--teal-border);
  color: var(--teal);
}

.confirm-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--teal);
  color: var(--teal-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}

.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
}

.glow-1 {
  width: 280px;
  height: 280px;
  background: rgba(93, 202, 165, 0.15);
  top: 10%;
  right: 0;
}

.glow-2 {
  width: 200px;
  height: 200px;
  background: rgba(127, 119, 221, 0.12);
  bottom: 0;
  left: 10%;
}

/* ── Sections ── */
.section {
  padding: 104px 0;
}

.section-alt {
  background: var(--bg2);
  border-block: 1px solid var(--border);
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
}

.section-head h2 {
  font-size: clamp(2rem, 3.5vw, var(--text-2xl));
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-sub {
  font-size: var(--text-base);
  color: var(--text2);
  line-height: 1.65;
}

.section-sub.left {
  text-align: left;
  margin-bottom: 28px;
}

/* Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.step-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: border-color 0.2s, transform 0.2s;
}

.section-alt .step-card {
  background: var(--bg3);
}

.step-card:hover {
  border-color: var(--teal-border);
  transform: translateY(-2px);
}

.step-num {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--teal);
  background: var(--teal-bg);
  border: 1px solid var(--teal-border);
  padding: 6px 12px;
  border-radius: 20px;
  margin-bottom: 18px;
}

.step-card h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: 12px;
}

.step-card p {
  font-size: var(--text-sm);
  color: var(--text2);
  line-height: 1.65;
}

/* Use cases */
.use-cases {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.use-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 28px;
  text-align: center;
  transition: border-color 0.2s;
}

.use-card:hover {
  border-color: var(--border-em);
}

.use-icon {
  font-size: 44px;
  margin-bottom: 20px;
  display: inline-flex;
  width: 80px;
  height: 80px;
  align-items: center;
  justify-content: center;
  border-radius: 20px;
  background: var(--bg3);
}

.use-card h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: 12px;
}

.use-card p {
  font-size: var(--text-sm);
  color: var(--text2);
  line-height: 1.65;
}

/* Why */
.why-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.why-copy h2 {
  font-size: clamp(2rem, 3.5vw, var(--text-2xl));
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.check-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.check-list li {
  font-size: var(--text-base);
  color: var(--text2);
  padding-left: 32px;
  position: relative;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--teal);
  font-weight: 700;
}

.why-cards {
  display: grid;
  gap: 16px;
}

.mini-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: grid;
  gap: 6px;
}

.mini-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text3);
  font-weight: 600;
}

.mini-value {
  font-size: 40px;
  font-weight: 700;
  color: var(--teal);
  letter-spacing: -0.02em;
}

.mini-hint {
  font-size: var(--text-sm);
  color: var(--text3);
}

/* CTA */
.cta-section {
  padding-bottom: 112px;
}

.cta-card {
  text-align: center;
  background: linear-gradient(135deg, var(--bg2) 0%, rgba(93, 202, 165, 0.08) 100%);
  border: 1px solid var(--teal-border);
  border-radius: 24px;
  padding: 64px 48px;
}

.cta-card h2 {
  font-size: clamp(1.75rem, 3.5vw, var(--text-xl));
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-card > p {
  font-size: var(--text-base);
  color: var(--text2);
  max-width: 540px;
  margin: 0 auto 36px;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 48px 0;
  background: var(--bg2);
}

.footer-inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: var(--text-md);
}

.footer-copy {
  font-size: var(--text-sm);
  color: var(--text3);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--teal);
}

.footer-links a:hover {
  text-decoration: underline;
}

.footer-legal {
  font-size: var(--text-xs);
  color: var(--text3);
  margin-top: 8px;
}

/* ── Mobile nav ── */
@media (max-width: 900px) {
  .hero-grid,
  .why-grid {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    order: -1;
  }

  .steps,
  .use-cases {
    grid-template-columns: 1fr;
  }

  .nav-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: 84px;
    left: 0;
    right: 0;
    background: var(--bg2);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    gap: 4px;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.25s, opacity 0.25s;
  }

  .nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav a {
    padding: 12px 14px !important;
  }
}

@media (max-width: 600px) {
  .hero {
    padding: 48px 0 64px;
  }

  .section {
    padding: 64px 0;
  }

  .cta-card {
    padding: 40px 24px;
  }

  .hero-actions,
  .cta-actions {
    flex-direction: column;
  }

  .hero-actions .btn,
  .cta-actions .btn {
    width: 100%;
  }
}