* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: #ecfdf5;
  color: #134e4a;
  line-height: 1.72;
}
a { color: #0d9488; }

.tsi-top {
  background: #134e4a;
  color: #ccfbf1;
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 20px;
  max-width: 920px;
  margin: 0 auto;
}
.tsi-brand { font-weight: 800; font-size: 18px; }
.tsi-nav { display: flex; gap: 12px; font-size: 14px; flex-wrap: wrap; }
.tsi-nav a { color: #99f6e4; text-decoration: none; font-weight: 600; }
.tsi-nav a:hover { color: #fff; }
.tsi-btn {
  display: inline-block;
  background: #14b8a6;
  color: #042f2e !important;
  text-decoration: none;
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 800;
  font-size: 14px;
  border: none;
  cursor: pointer;
}
.tsi-wrap { max-width: 920px; margin: 0 auto; padding: 24px 20px 48px; }
.tsi-hero {
  background: #fff;
  border: 1px solid #99f6e4;
  border-radius: 16px;
  padding: 32px 26px;
  margin-bottom: 24px;
}
.tsi-hero h1 { margin: 0 0 12px; font-size: clamp(24px, 4vw, 34px); color: #115e59; }
.tsi-lead { color: #64748b; font-size: 17px; margin: 0 0 16px; }
.tsi-lesson {
  background: #fff;
  border: 1px solid #99f6e4;
  border-radius: 14px;
  padding: 26px;
  margin-bottom: 18px;
}
.tsi-lesson h2 { margin: 0 0 10px; font-size: 20px; color: #0f766e; }
.tsi-num {
  display: inline-block;
  background: #134e4a;
  color: #fff;
  width: 28px;
  height: 28px;
  line-height: 28px;
  text-align: center;
  border-radius: 50%;
  font-size: 14px;
  font-weight: 800;
  margin-right: 8px;
}
.tsi-faq details {
  background: #fff;
  border: 1px solid #99f6e4;
  border-radius: 10px;
  padding: 12px 16px;
  margin-bottom: 10px;
}
.tsi-faq summary { font-weight: 700; cursor: pointer; color: #115e59; }
.tsi-portal {
  background: #134e4a;
  color: #ccfbf1;
  border-radius: 14px;
  padding: 24px;
  text-align: center;
  margin: 24px 0;
}
.tsi-portal a { color: #5eead4; font-weight: 800; font-size: 20px; }
.tsi-phone {
  background: #fff;
  border: 1px dashed #14b8a6;
  border-radius: 12px;
  padding: 18px;
  margin: 20px 0;
  text-align: center;
}
.tsi-phone-mask { font-size: 20px; letter-spacing: 0.08em; margin: 8px 0; }
.tsi-acc-btn {
  width: 100%;
  text-align: left;
  background: #f0fdfa;
  border: 1px solid #99f6e4;
  border-radius: 10px;
  padding: 12px 16px;
  font-weight: 700;
  color: #115e59;
  cursor: pointer;
  margin-bottom: 8px;
}
.tsi-acc-panel {
  background: #fff;
  border: 1px solid #99f6e4;
  border-radius: 0 0 10px 10px;
  padding: 14px 16px;
  margin: -8px 0 12px;
  font-size: 15px;
}
.tsi-foot { text-align: center; padding: 24px; font-size: 14px; color: #64748b; }
.tsi-icons { display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; margin: 20px 0; }
.tsi-icon {
  width: 56px;
  height: 56px;
  background: #f0fdfa;
  border: 2px solid #14b8a6;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}