/* =========================================================
   授课模式与教学体系组件
   独立命名空间：tls-*
   ========================================================= */

#course-teaching-system {
  --tls-blue: var(--blue, #0b63e5);
  --tls-blue-dark: var(--blue-dark, #0a4cb0);
  --tls-blue-deep: var(--blue-deep, #0a2540);
  --tls-blue-soft: var(--blue-light, #e8f1ff);
  --tls-orange: #f3a51d;
  --tls-ink: var(--text, #1f2d3d);
  --tls-muted: var(--text-sub, #5b6b7f);
  --tls-border: var(--border, #e3eaf3);
  --tls-surface: var(--white, #fff);
  --tls-page: var(--bg-alt, #f5f8fd);
  --tls-radius: var(--radius, 14px);
  --tls-shadow: var(--shadow, 0 8px 30px rgba(11, 99, 229, 0.08));
  padding: 56px 0;
  background: var(--tls-page);
  color: var(--tls-ink);
}

#course-teaching-system *,
#course-teaching-system *::before,
#course-teaching-system *::after {
  box-sizing: border-box;
}

#course-teaching-system svg {
  display: block;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

#course-teaching-system button {
  font: inherit;
}

#course-teaching-system .tls-icon-library {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

#course-teaching-system .tls-container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
}

#course-teaching-system .tls-panel {
  position: relative;
  overflow: hidden;
  padding: 44px;
  border: 1px solid var(--tls-border);
  border-radius: 22px;
  background: var(--tls-surface);
  box-shadow: var(--tls-shadow);
}

#course-teaching-system .tls-head {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(360px, 0.75fr);
  gap: 40px;
  align-items: end;
  margin-bottom: 34px;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--tls-border);
}

#course-teaching-system .tls-head-copy {
  min-width: 0;
}

#course-teaching-system .tls-title {
  margin: 0;
  color: var(--tls-blue-deep);
  font-size: clamp(34px, 3.3vw, 48px);
  font-weight: 750;
  letter-spacing: -0.045em;
  line-height: 1.16;
}

#course-teaching-system .tls-intro {
  max-width: 720px;
  margin: 14px 0 19px;
  color: var(--tls-muted);
  font-size: 16px;
  line-height: 1.85;
}

#course-teaching-system .tls-devices {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--tls-blue-deep);
  font-size: 13px;
  font-weight: 600;
}

#course-teaching-system .tls-devices svg {
  width: 20px;
  height: 20px;
  color: var(--tls-blue);
}

#course-teaching-system .tls-devices i {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--tls-blue);
}

#course-teaching-system .tls-promise {
  position: relative;
  overflow: hidden;
  padding: 23px 25px 21px;
  border: 1px solid var(--tls-border);
  border-radius: 16px;
  background: #f8fbff;
}

#course-teaching-system .tls-promise::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 64px;
  height: 3px;
  background: linear-gradient(90deg, var(--tls-blue), #87b7f3);
}

#course-teaching-system .tls-promise > p {
  margin: 0 0 16px;
  color: var(--tls-blue-deep);
  font-size: 13px;
  font-weight: 700;
}

#course-teaching-system .tls-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 17px;
}

#course-teaching-system .tls-metrics div {
  min-width: 0;
}

#course-teaching-system .tls-metrics strong {
  display: block;
  color: var(--tls-blue);
  font-family: "DIN Alternate", "Avenir Next Condensed", "PingFang SC", sans-serif;
  font-size: 32px;
  font-weight: 800;
  line-height: 1;
}

#course-teaching-system .tls-metrics span {
  display: block;
  margin-top: 7px;
  color: var(--tls-muted);
  font-size: 11px;
  line-height: 1.5;
}

#course-teaching-system .tls-promise-mark {
  position: absolute;
  top: 21px;
  right: 24px;
  padding: 2px 8px;
  border: 1px solid #cfe0f5;
  color: var(--tls-blue);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

#course-teaching-system .tls-module {
  position: relative;
  padding: 32px 0;
  border-bottom: 1px solid var(--tls-border);
}

#course-teaching-system .tls-service-module {
  padding-bottom: 0;
  border-bottom: 0;
}

#course-teaching-system .tls-module-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

#course-teaching-system .tls-module-title {
  display: flex;
  align-items: center;
  gap: 18px;
  min-width: 0;
}

#course-teaching-system .tls-module-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 52px;
  width: 52px;
  height: 52px;
  border: 1px solid #cfe0f5;
  border-radius: 50%;
  background: var(--tls-surface);
  color: var(--tls-blue);
  font-family: "DIN Alternate", "Avenir Next Condensed", "PingFang SC", sans-serif;
  font-size: 18px;
  font-weight: 800;
  box-shadow: 0 8px 22px rgba(10, 70, 159, 0.1);
}

#course-teaching-system .tls-module-eyebrow {
  margin: 0 0 2px;
  color: var(--tls-blue);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
}

#course-teaching-system .tls-module-title h3 {
  margin: 0;
  color: var(--tls-blue-deep);
  font-size: clamp(22px, 2vw, 29px);
  font-weight: 720;
  letter-spacing: -0.025em;
  line-height: 1.35;
  text-wrap: balance;
}

#course-teaching-system .tls-side-note {
  flex-shrink: 0;
  margin: 0;
  color: var(--tls-muted);
  font-size: 12px;
}

#course-teaching-system .tls-step-controls {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: 8px;
}

#course-teaching-system .tls-step-nav {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid #cfe0f5;
  border-radius: 11px;
  background: var(--tls-surface);
  color: var(--tls-blue);
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

#course-teaching-system .tls-step-nav svg {
  width: 17px;
  height: 17px;
  stroke-width: 2;
}

#course-teaching-system .tls-step-nav:hover:not(:disabled) {
  border-color: var(--tls-blue);
  background: var(--tls-blue-soft);
  transform: translateY(-1px);
}

#course-teaching-system .tls-step-nav:disabled {
  opacity: 0.35;
  cursor: default;
}

#course-teaching-system .tls-step-nav:focus-visible {
  outline: 3px solid rgba(11, 99, 229, 0.28);
  outline-offset: 2px;
}

#course-teaching-system .tls-step-progress {
  display: inline-flex;
  align-items: baseline;
  min-width: 49px;
  color: #8a9aae;
  font-family: "DIN Alternate", "Avenir Next Condensed", "PingFang SC", sans-serif;
  font-size: 12px;
  font-weight: 700;
}

#course-teaching-system .tls-step-progress strong {
  margin-right: 4px;
  color: var(--tls-blue);
  font-size: 17px;
}

#course-teaching-system .tls-journey-steps {
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
  padding: 29px 0 0;
  list-style: none;
}

#course-teaching-system .tls-journey-steps li {
  position: relative;
  min-width: 0;
}

#course-teaching-system .tls-journey-step {
  position: relative;
  z-index: 1;
  width: 100%;
  min-height: 138px;
  padding: 39px 16px 15px;
  border: 1px solid var(--tls-border);
  border-radius: 15px;
  background: var(--tls-surface);
  color: var(--tls-ink);
  text-align: left;
  cursor: pointer;
  box-shadow: 0 9px 26px rgba(10, 70, 159, 0.06);
  transition: border-color 0.24s ease, box-shadow 0.24s ease, transform 0.24s ease;
}

#course-teaching-system .tls-journey-step:hover,
#course-teaching-system .tls-journey-step:focus-visible {
  border-color: #9fc5f5;
  box-shadow: 0 16px 34px rgba(10, 70, 159, 0.12);
  transform: translateY(-4px);
}

#course-teaching-system .tls-journey-step.is-active {
  border-color: #aacbf3;
  background: linear-gradient(180deg, #fff 0%, #f5f9ff 100%);
  box-shadow: 0 14px 32px rgba(10, 70, 159, 0.11);
  transform: translateY(-2px);
}

#course-teaching-system .tls-journey-step.is-active .tls-step-copy b {
  color: var(--tls-blue);
}

#course-teaching-system .tls-journey-step:focus-visible,
#course-teaching-system .tls-mode:focus-visible,
#course-teaching-system .tls-service-outcome:focus-visible {
  outline: 3px solid rgba(11, 99, 229, 0.28);
  outline-offset: 3px;
}

#course-teaching-system .tls-step-node {
  position: absolute;
  top: -29px;
  left: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 58px;
  height: 58px;
  margin: 0;
  border: 5px solid var(--tls-surface);
  border-radius: 50%;
  background: var(--tls-blue);
  color: #fff;
  box-shadow: 0 0 0 1px var(--tls-blue), 0 8px 20px rgba(11, 99, 229, 0.18);
  transform: translateX(-50%);
  transition: background 0.24s ease, color 0.24s ease, box-shadow 0.24s ease;
}

#course-teaching-system .tls-step-node svg {
  width: 23px;
  height: 23px;
}

#course-teaching-system .tls-journey-step.is-active .tls-step-node {
  background: var(--tls-blue);
  color: #fff;
  box-shadow: 0 0 0 3px rgba(11, 99, 229, 0.13), 0 10px 24px rgba(11, 99, 229, 0.24);
}

#course-teaching-system .tls-journey-step.is-changing .tls-step-node {
  animation: tls-step-pop 0.36s ease;
}

#course-teaching-system .tls-journey-step.is-changing .tls-step-copy {
  animation: tls-copy-in 0.28s ease;
}

#course-teaching-system .tls-journey-step.is-active .tls-step-node::after {
  content: "";
  position: absolute;
  top: 1px;
  right: -1px;
  width: 5px;
  height: 5px;
  border: 2px solid var(--tls-surface);
  border-radius: 50%;
  background: var(--tls-orange);
}

#course-teaching-system .tls-step-copy {
  display: block;
}

#course-teaching-system .tls-step-copy b {
  display: block;
  margin-bottom: 5px;
  color: var(--tls-blue-deep);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
}

#course-teaching-system .tls-step-copy b small {
  display: block;
  margin-bottom: 3px;
  color: var(--tls-blue);
  font-family: "DIN Alternate", "Avenir Next Condensed", "PingFang SC", sans-serif;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
}

#course-teaching-system .tls-step-copy > span {
  display: block;
  color: var(--tls-muted);
  font-size: 12px;
  line-height: 1.6;
}

#course-teaching-system .tls-learning-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.82fr) minmax(0, 1.35fr);
  overflow: hidden;
  border: 1px solid #cadcf1;
  border-radius: 18px;
  background: var(--tls-blue-deep);
}

#course-teaching-system .tls-learning-statement {
  position: relative;
  display: flex;
  min-height: 286px;
  flex-direction: column;
  justify-content: center;
  padding: 30px;
  color: #fff;
  transition: background-color 0.3s ease;
}

#course-teaching-system .tls-learning-layout.is-replay-mode .tls-learning-statement {
  background: #0b3157;
}

#course-teaching-system .tls-learning-statement::after {
  content: "";
  position: absolute;
  top: 34px;
  right: -1px;
  bottom: 34px;
  width: 1px;
  background: rgba(255, 255, 255, 0.13);
}

#course-teaching-system .tls-learning-statement h4 {
  max-width: 360px;
  margin: 0 0 13px;
  color: #fff;
  font-size: clamp(27px, 2.5vw, 36px);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.28;
  text-wrap: balance;
}

#course-teaching-system .tls-learning-statement > p:not(.tls-mode-readout) {
  max-width: 390px;
  margin: 0;
  color: #a9bdd4;
  font-size: 13px;
  line-height: 1.85;
}

#course-teaching-system .tls-mode-readout {
  position: relative;
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: #d4e2f2;
  font-size: 12px;
}

#course-teaching-system .tls-mode-readout::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--tls-blue);
  vertical-align: 1px;
}

#course-teaching-system .tls-mode-readout::after {
  content: "";
  display: block;
  width: 72%;
  height: 2px;
  margin-top: 10px;
  border-radius: 99px;
  background: linear-gradient(90deg, #68a7f9, rgba(104, 167, 249, 0.18));
  transition: width 0.35s ease, background 0.35s ease;
}

#course-teaching-system .tls-learning-layout.is-replay-mode .tls-mode-readout::after {
  width: 38%;
  background: linear-gradient(90deg, #9cc9ff, rgba(156, 201, 255, 0.18));
}

#course-teaching-system .tls-mode-readout.is-changing {
  animation: tls-copy-in 0.28s ease;
}

#course-teaching-system .tls-learning-modes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  padding: 18px;
  background: #f7faff;
}

#course-teaching-system .tls-mode {
  position: relative;
  display: flex;
  min-width: 0;
  min-height: 184px;
  flex-direction: column;
  align-items: flex-start;
  padding: 17px;
  border: 1px solid var(--tls-border);
  border-radius: 14px;
  background: var(--tls-surface);
  color: var(--tls-ink);
  text-align: left;
  cursor: pointer;
  transition: border-color 0.24s ease, box-shadow 0.24s ease, transform 0.24s ease;
}

#course-teaching-system .tls-mode:hover,
#course-teaching-system .tls-mode.is-active {
  border-color: #a8caf5;
  box-shadow: 0 14px 30px rgba(10, 70, 159, 0.1);
  transform: translateY(-3px);
}

#course-teaching-system .tls-mode.is-active {
  border-color: var(--tls-blue);
  background: #fbfdff;
  box-shadow: inset 0 0 0 1px var(--tls-blue), 0 14px 30px rgba(10, 70, 159, 0.1);
}

#course-teaching-system .tls-mode::after {
  content: "";
  position: absolute;
  top: 16px;
  right: 16px;
  width: 8px;
  height: 4px;
  border-bottom: 2px solid var(--tls-blue);
  border-left: 2px solid var(--tls-blue);
  opacity: 0;
  transform: rotate(-45deg) scale(0.65);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

#course-teaching-system .tls-mode.is-active::after {
  opacity: 1;
  transform: rotate(-45deg) scale(1);
}

#course-teaching-system .tls-mode.is-active .tls-mode-icon {
  background: var(--tls-blue);
  color: #fff;
}

#course-teaching-system .tls-mode-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-bottom: 13px;
  border-radius: 11px;
  background: var(--tls-blue-soft);
  color: var(--tls-blue);
}

#course-teaching-system .tls-mode-icon svg {
  width: 23px;
  height: 23px;
}

#course-teaching-system .tls-mode-status {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 6px;
  color: var(--tls-muted);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

#course-teaching-system .tls-mode-status i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--tls-blue);
}

#course-teaching-system .tls-mode > strong {
  margin-bottom: 7px;
  color: var(--tls-blue-deep);
  font-size: 20px;
}

#course-teaching-system .tls-mode > span:not(.tls-mode-icon):not(.tls-mode-status) {
  color: var(--tls-muted);
  font-size: 12px;
  line-height: 1.7;
}

#course-teaching-system .tls-mode > small {
  margin-top: auto;
  padding-top: 10px;
  color: var(--tls-blue);
  font-size: 11px;
  font-weight: 600;
}

#course-teaching-system .tls-device-strip {
  display: flex;
  grid-column: 1 / -1;
  align-items: center;
  gap: 12px;
  min-height: 52px;
  padding: 9px 14px;
  border: 1px dashed #bed3ed;
  border-radius: 12px;
  background: #edf5ff;
}

#course-teaching-system .tls-device-screen {
  position: relative;
  display: block;
  flex: 0 0 auto;
  border: 2px solid var(--tls-blue);
  background: var(--tls-surface);
}

#course-teaching-system .tls-device-screen::after {
  content: "";
  position: absolute;
  background: var(--tls-blue);
}

#course-teaching-system .tls-monitor {
  width: 31px;
  height: 21px;
  border-radius: 3px;
}

#course-teaching-system .tls-monitor::after {
  bottom: -8px;
  left: 12px;
  width: 7px;
  height: 6px;
  border-radius: 1px;
}

#course-teaching-system .tls-phone {
  width: 14px;
  height: 24px;
  border-radius: 4px;
}

#course-teaching-system .tls-phone::after {
  bottom: 2px;
  left: 5px;
  width: 2px;
  height: 2px;
  border-radius: 50%;
}

#course-teaching-system .tls-device-strip p {
  display: flex;
  min-width: 0;
  flex-direction: column;
  margin: 0 0 0 3px;
}

#course-teaching-system .tls-device-strip strong {
  color: var(--tls-blue-deep);
  font-size: 12px;
}

#course-teaching-system .tls-device-strip p span {
  color: var(--tls-muted);
  font-size: 11px;
}

#course-teaching-system .tls-service-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: start;
  gap: 16px;
}

#course-teaching-system .tls-service-card {
  position: relative;
  overflow: hidden;
  padding: 24px;
  border: 1px solid var(--tls-border);
  border-radius: 16px;
  background: var(--tls-surface);
  box-shadow: 0 10px 28px rgba(10, 70, 159, 0.055);
  transition: border-color 0.24s ease, box-shadow 0.24s ease, transform 0.24s ease;
}

#course-teaching-system .tls-service-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--tls-blue), #85b6f1);
  transform: scaleX(0.14);
  transform-origin: left;
  transition: transform 0.3s ease;
}

#course-teaching-system .tls-service-card:hover {
  border-color: #aacbf3;
  box-shadow: 0 18px 40px rgba(10, 70, 159, 0.11);
  transform: translateY(-3px);
}

#course-teaching-system .tls-service-card:hover::before {
  transform: scaleX(1);
}

#course-teaching-system .tls-service-card header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 15px;
}

#course-teaching-system .tls-service-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 35px;
  height: 35px;
  border-radius: 9px;
  background: var(--tls-blue-soft);
  color: var(--tls-blue);
}

#course-teaching-system .tls-service-icon svg {
  width: 20px;
  height: 20px;
}

#course-teaching-system .tls-service-label {
  color: var(--tls-blue);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.11em;
}

#course-teaching-system .tls-service-card h4 {
  min-height: 3.1em;
  margin: 0 0 15px;
  color: var(--tls-blue-deep);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.55;
  text-wrap: balance;
}

#course-teaching-system .tls-service-card ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

#course-teaching-system .tls-service-card li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: var(--tls-muted);
  font-size: 12px;
  line-height: 1.6;
}

#course-teaching-system .tls-service-card li svg {
  flex: 0 0 14px;
  width: 14px;
  height: 14px;
  margin-top: 2px;
  color: var(--tls-blue);
  stroke-width: 2.2;
}

#course-teaching-system .tls-service-card.tls-service-card--list-accent ul.tls-service-points {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 16px 0 0;
  border-top: 1px solid #cbdcf5;
  list-style: none;
}

#course-teaching-system .tls-service-card.tls-service-card--list-accent .tls-service-points li {
  display: grid;
  grid-template-columns: 6px minmax(0, 1fr);
  align-items: flex-start;
  gap: 10px;
}

#course-teaching-system .tls-service-card.tls-service-card--list-accent .tls-service-points li > i {
  width: 5px;
  height: 5px;
  margin-top: 7px;
  border-radius: 50%;
  background: var(--tls-blue);
}

#course-teaching-system .tls-service-card.tls-service-card--list-accent .tls-service-points li > span {
  display: block;
  min-width: 0;
}

#course-teaching-system .tls-service-card.tls-service-card--list-accent .tls-service-points strong {
  display: block;
  color: var(--tls-blue-deep);
  font-size: 13px;
  font-weight: 680;
  line-height: 1.5;
}

#course-teaching-system .tls-service-card.tls-service-card--list-accent .tls-service-points small {
  display: block;
  margin-top: 1px;
  color: var(--tls-muted);
  font-size: 11.5px;
  line-height: 1.65;
}

#course-teaching-system .tls-service-outcome {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 16px;
  align-items: start;
  gap: 4px 8px;
  width: 100%;
  margin: 18px 0 0;
  padding-top: 14px;
  border: 0;
  border-top: 1px dashed #d9e5f2;
  border-radius: 0;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
}

#course-teaching-system .tls-service-outcome:hover strong,
#course-teaching-system .tls-service-outcome[aria-expanded="true"] strong {
  color: var(--tls-blue);
}

#course-teaching-system .tls-service-outcome:hover .tls-service-chevron {
  transform: translateY(2px);
}

#course-teaching-system .tls-service-outcome span {
  flex: 0 0 auto;
  color: var(--tls-blue);
  font-size: 10px;
  font-weight: 700;
}

#course-teaching-system .tls-service-outcome strong {
  color: var(--tls-blue-deep);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.65;
}

#course-teaching-system .tls-service-chevron {
  width: 15px;
  height: 15px;
  margin-top: 2px;
  color: var(--tls-blue);
  transition: transform 0.24s ease;
}

#course-teaching-system .tls-service-card.is-open .tls-service-chevron {
  transform: rotate(180deg);
}

#course-teaching-system .tls-service-card.is-open {
  border-color: #aacbf3;
  box-shadow: 0 16px 36px rgba(10, 70, 159, 0.1);
}

#course-teaching-system .tls-service-card.is-open::before {
  transform: scaleX(1);
}

#course-teaching-system .tls-service-detail {
  margin-top: 12px;
  padding: 11px 12px;
  border-radius: 9px;
  background: #f3f8ff;
  animation: tls-detail-in 0.28s ease both;
}

#course-teaching-system .tls-service-detail[hidden] {
  display: none;
}

#course-teaching-system .tls-service-detail p {
  margin: 0;
  color: var(--tls-muted);
  font-size: 11px;
  line-height: 1.65;
}

#course-teaching-system .tls-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@keyframes tls-step-pop {
  0% { transform: translateX(-50%) scale(0.9); }
  55% { transform: translateX(-50%) scale(1.08); }
  100% { transform: translateX(-50%) scale(1); }
}

@keyframes tls-copy-in {
  from { opacity: 0.4; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes tls-detail-in {
  from { opacity: 0; transform: translateY(-5px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 1120px) {
  #course-teaching-system .tls-panel {
    padding: 34px;
  }

  #course-teaching-system .tls-head {
    grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
    gap: 26px;
  }

  #course-teaching-system .tls-journey-step {
    padding-right: 12px;
    padding-left: 12px;
  }
}

@media (max-width: 980px) {
  #course-teaching-system {
    padding: 36px 0;
  }

  #course-teaching-system .tls-panel {
    padding: 24px;
    border-radius: 18px;
  }

  #course-teaching-system .tls-head {
    grid-template-columns: 1fr;
    gap: 22px;
    margin-bottom: 20px;
    padding-bottom: 24px;
  }

  #course-teaching-system .tls-module {
    padding: 26px 0;
  }

  #course-teaching-system .tls-module-head {
    align-items: flex-start;
  }

  #course-teaching-system .tls-module-index {
    flex-basis: 43px;
    width: 43px;
    height: 43px;
    font-size: 15px;
  }

  #course-teaching-system .tls-module-title {
    gap: 12px;
  }

  #course-teaching-system .tls-module-title h3 {
    font-size: 23px;
  }

  #course-teaching-system .tls-side-note {
    display: none;
  }

  #course-teaching-system .tls-step-controls {
    display: none;
  }

  #course-teaching-system .tls-journey-steps {
    display: block;
    padding: 0;
  }

  #course-teaching-system .tls-journey-steps::before {
    content: "";
    position: absolute;
    top: 28px;
    bottom: 28px;
    left: 31px;
    width: 2px;
    background: linear-gradient(180deg, #dbe8f8 0%, var(--tls-blue) 72%, #94bdec 100%);
  }

  #course-teaching-system .tls-journey-steps li + li {
    margin-top: 9px;
  }

  #course-teaching-system .tls-journey-step {
    display: grid;
    grid-template-columns: 50px minmax(0, 1fr);
    gap: 13px;
    align-items: center;
    min-height: 62px;
    padding: 8px 12px 8px 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    text-align: left;
  }

  #course-teaching-system .tls-journey-step:hover,
  #course-teaching-system .tls-journey-step:focus-visible {
    border-color: transparent;
    background: #f3f8ff;
    box-shadow: none;
    transform: none;
  }

  #course-teaching-system .tls-journey-step.is-active {
    background: #f5f9ff;
    box-shadow: inset 0 0 0 1px #dbe8f8;
    transform: none;
  }

  #course-teaching-system .tls-step-node {
    position: relative;
    top: auto;
    left: auto;
    width: 44px;
    height: 44px;
    margin: 0 0 0 9px;
    border: 4px solid var(--tls-surface);
    background: var(--tls-blue);
    color: #fff;
    box-shadow: 0 0 0 1px var(--tls-blue);
    transform: none;
  }

  #course-teaching-system .tls-step-node svg {
    width: 18px;
    height: 18px;
  }

  #course-teaching-system .tls-journey-step.is-active .tls-step-node::after {
    top: -4px;
    right: -4px;
  }

  #course-teaching-system .tls-journey-step.is-changing .tls-step-node {
    animation-name: tls-step-pop-mobile;
  }

  #course-teaching-system .tls-step-copy {
    text-align: left;
  }

  #course-teaching-system .tls-step-copy b {
    margin-bottom: 1px;
    font-size: 14px;
  }

  #course-teaching-system .tls-step-copy b small {
    display: inline;
    margin-right: 6px;
  }

  #course-teaching-system .tls-learning-layout {
    display: block;
    border-radius: 14px;
  }

  #course-teaching-system .tls-learning-statement {
    min-height: 0;
    padding: 25px;
  }

  #course-teaching-system .tls-learning-statement::after {
    display: none;
  }

  #course-teaching-system .tls-learning-statement h4 {
    font-size: 27px;
  }

  #course-teaching-system .tls-learning-modes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding: 16px;
  }

  #course-teaching-system .tls-mode {
    min-height: 190px;
  }

  #course-teaching-system .tls-service-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  #course-teaching-system .tls-service-card {
    padding: 21px;
  }

  #course-teaching-system .tls-service-card h4 {
    min-height: 0;
  }

}

@media (max-width: 600px) {
  #course-teaching-system {
    padding: 28px 0;
  }

  #course-teaching-system .tls-container {
    padding: 0 12px;
  }

  #course-teaching-system .tls-panel {
    padding: 18px;
    border-radius: 14px;
  }

  #course-teaching-system .tls-title {
    font-size: 31px;
  }

  #course-teaching-system .tls-intro {
    font-size: 14px;
  }

  #course-teaching-system .tls-devices {
    flex-wrap: wrap;
    font-size: 12px;
  }

  #course-teaching-system .tls-promise {
    padding: 16px;
  }

  #course-teaching-system .tls-metrics {
    gap: 10px;
  }

  #course-teaching-system .tls-metrics strong {
    font-size: 27px;
  }

  #course-teaching-system .tls-metrics span {
    font-size: 10px;
  }

  #course-teaching-system .tls-promise-mark {
    display: none;
  }

  #course-teaching-system .tls-module {
    padding: 22px 0;
  }

  #course-teaching-system .tls-module-title h3 {
    font-size: 20px;
  }

  #course-teaching-system .tls-module-eyebrow {
    font-size: 10px;
  }

  #course-teaching-system .tls-learning-statement {
    padding: 21px;
  }

  #course-teaching-system .tls-learning-statement h4 {
    font-size: 23px;
  }

  #course-teaching-system .tls-learning-modes {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 12px;
  }

  #course-teaching-system .tls-mode {
    min-height: 0;
    padding: 17px;
  }

  #course-teaching-system .tls-mode-icon {
    margin-bottom: 12px;
  }

  #course-teaching-system .tls-device-strip {
    min-height: 58px;
    padding: 10px 12px;
  }

  #course-teaching-system .tls-service-card {
    padding: 18px;
  }

  #course-teaching-system .tls-service-card h4 {
    font-size: 16px;
  }

}

@media (prefers-reduced-motion: reduce) {
  #course-teaching-system *,
  #course-teaching-system *::before,
  #course-teaching-system *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@keyframes tls-step-pop-mobile {
  0% { transform: scale(0.9); }
  55% { transform: scale(1.08); }
  100% { transform: scale(1); }
}