.ah-roadmap {
  --ah-roadmap-line-color: #dcdcdc;
  --ah-roadmap-dot-color: #383f3b;
  --ah-roadmap-active-dot-color: #37404a;
  --ah-roadmap-year-color: #000000;
  --ah-roadmap-inactive-year-color: #d0d0d0;
  --ah-roadmap-description-color: #178d17;
  --ah-roadmap-button-background: #6d7689;
  --ah-roadmap-button-text-color: #ffffff;
  --ah-roadmap-playhead-x: 25%;
  --ah-roadmap-strip-x: 0px;
  --ah-roadmap-label-gap: 1.25rem;
  --ah-roadmap-center-y: 50%;
  width: 100%;
  font-family: "Lato", sans-serif;
}

.ah-roadmap *,
.ah-roadmap *::before,
.ah-roadmap *::after {
  box-sizing: border-box;
}

.ah-roadmap__shell {
  width: 100%;
  max-width: 1024px;
  margin: 0 auto;
}

/* -------- Track : viewport cố định, strip trượt bên trong -------- */
.ah-roadmap__track {
  position: relative;
  margin: 0 auto 4rem;
  padding: 10rem 0 var(--ah-roadmap-track-pad-b, 14rem);
  border-top: 1px solid var(--ah-roadmap-line-color);
  border-bottom: 1px solid var(--ah-roadmap-line-color);
  overflow-x: clip;
  overflow-y: visible;
  transition: padding 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.ah-roadmap__track::before {
  content: "";
  position: absolute;
  top: var(--ah-roadmap-center-y);
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--ah-roadmap-line-color);
  z-index: 0;
}

/* -------- Playhead : CỐ ĐỊNH, không trượt -------- */
.ah-roadmap__playhead {
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--ah-roadmap-playhead-x);
  width: 1px;
  background-color: var(--ah-roadmap-line-color);
  transform: translateX(-50%);
  z-index: 1;
  pointer-events: none;
}

.ah-roadmap__playhead::before,
.ah-roadmap__playhead::after {
  content: "";
  position: absolute;
  left: -7px;
  width: 0;
  height: 0;
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
}

.ah-roadmap__playhead::before {
  top: 0;
  border-top: 8px solid var(--ah-roadmap-line-color);
}

.ah-roadmap__playhead::after {
  bottom: 0;
  border-bottom: 8px solid var(--ah-roadmap-line-color);
}

/* -------- Strip : trượt ngang để active rơi vào playhead -------- */
.ah-roadmap__steps {
  position: absolute;
  top: var(--ah-roadmap-center-y);
  left: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8rem;
  z-index: 2;
  transform: translate(var(--ah-roadmap-strip-x), -50%);
  will-change: transform;
}

.ah-roadmap[data-ah-roadmap-ready="true"] .ah-roadmap__steps {
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.ah-roadmap__step {
  position: relative;
  flex: 0 0 auto;
  display: flex;
  justify-content: center;
}

/* -------- Hit-area = year + dot, ăn click -------- */
.ah-roadmap__hit {
  position: relative;
  display: block;
  width: 1.2rem;
  height: 1.2rem;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  font: inherit;
  color: inherit;
}

.ah-roadmap__hit:focus-visible {
  outline: 2px solid var(--ah-roadmap-active-dot-color);
  outline-offset: 6px;
  border-radius: 50%;
}

/* -------- Dot -------- */
.ah-roadmap__dot {
  position: absolute;
  top: 0;
  left: 0;
  width: 1.2rem;
  height: 1.2rem;
  border-radius: 50%;
  border: 2px solid var(--ah-roadmap-dot-color);
  background-color: #fff;
  transition: background-color 0.35s ease, border-color 0.35s ease;
}

.ah-roadmap__hit:hover .ah-roadmap__dot {
  background-color: #a6a5a5;
}

.ah-roadmap__step.is-active .ah-roadmap__dot {
  border-color: var(--ah-roadmap-active-dot-color);
  background-color: var(--ah-roadmap-active-dot-color);
}

/* -------- Year label : phía trên-phải dot, đi cùng strip -------- */
.ah-roadmap__year {
  position: absolute;
  bottom: calc(100% + 3rem);
  left: calc(50% + var(--ah-roadmap-label-gap));
  transform: none;
  white-space: nowrap;
  color: var(--ah-roadmap-inactive-year-color);
  font-family: "Lato", sans-serif;
  font-size: 1rem;
  line-height: 1;
  transition: color 0.35s ease, font-weight 0.35s ease;
}

.ah-roadmap__step.is-active .ah-roadmap__year {
  color: var(--ah-roadmap-year-color);
  font-weight: 600;
}

/* -------- Description : phía dưới-phải dot, anchored bên phải playhead -------- */
.ah-roadmap__desc {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: calc(50% + var(--ah-roadmap-label-gap));
  transform: none;
  width: 700px;
  color: var(--ah-roadmap-description-color);
  font-family: "Lato", sans-serif;
  font-size: 1rem;
  line-height: 1.5;
  text-align: left;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

.ah-roadmap__desc > *:first-child { margin-top: 0; }
.ah-roadmap__desc > *:last-child  { margin-bottom: 0; }

.ah-roadmap__desc p {
  margin: 0 0 0.15em;
}

.ah-roadmap__desc ul,
.ah-roadmap__desc ol {
  margin: 0 0 0.75em;
  padding-left: 1.3em;
}

.ah-roadmap__desc li {
  margin-bottom: 0.25em;
}

.ah-roadmap__desc strong {
  font-weight: 700;
  font-size: 1.15rem;
  margin-bottom: 0.5em;
  display: inline-block;
}

.ah-roadmap__step.is-active .ah-roadmap__desc {
  opacity: 1;
  pointer-events: auto;
}

/* -------- Actions / buttons -------- */
.ah-roadmap__actions {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 24px;
  padding-top: 8px;
}

.ah-roadmap__nav {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 16px;
  border: 0;
  border-radius: 4px;
  background: var(--ah-roadmap-button-background);
  color: var(--ah-roadmap-button-text-color);
  font-family: "Lato", sans-serif;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.ah-roadmap__nav:hover:not(:disabled) {
  opacity: 0.92;
  transform: translateY(-1px);
}

.ah-roadmap__nav:disabled {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* -------- Responsive -------- */
@media (max-width: 1200px) {
  .ah-roadmap__desc { width: 600px; }
  .ah-roadmap__steps { gap: 7rem; }
}

@media (max-width: 900px) {
  .ah-roadmap { --ah-roadmap-playhead-x: 22%; }
  .ah-roadmap__desc { width: 420px; top: calc(100% + 1.25rem); }
  .ah-roadmap__steps { gap: 5.5rem; }
  .ah-roadmap__track { padding-top: 8rem; padding-bottom: var(--ah-roadmap-track-pad-b, 12rem); }
  .ah-roadmap__year { bottom: calc(100% + 2.5rem); }
}

@media (max-width: 767px) {
  .ah-roadmap { --ah-roadmap-playhead-x: 18%; --ah-roadmap-center-y: 35%; }
  .ah-roadmap__desc { width: 320px; top: calc(100% + 1rem); }
  .ah-roadmap__steps { gap: 4.5rem; }
  .ah-roadmap__track { padding-top: 5rem; padding-bottom: var(--ah-roadmap-track-pad-b, 11rem); }
  .ah-roadmap__year { bottom: calc(100% + 1.5rem); }
  .ah-roadmap__actions { margin-top: 20px; }
}

@media (max-width: 460px) {
  .ah-roadmap { --ah-roadmap-playhead-x: 15%; --ah-roadmap-label-gap: 0.85rem; --ah-roadmap-center-y: 32%; }
  .ah-roadmap__desc { width: 240px; top: calc(100% + 0.75rem); }
  .ah-roadmap__steps { gap: 3.5rem; }
  .ah-roadmap__track { padding-top: 3.5rem; padding-bottom: var(--ah-roadmap-track-pad-b, 10rem); }
  .ah-roadmap__year { bottom: calc(100% + 1rem); }
}

/* -------- Reduced motion -------- */
@media (prefers-reduced-motion: reduce) {
  .ah-roadmap__steps,
  .ah-roadmap__dot,
  .ah-roadmap__year,
  .ah-roadmap__desc,
  .ah-roadmap__nav {
    transition: none !important;
  }
}