@import url("page-header.css");

:root {
  color-scheme: light;
  --page-bg: #ffffff;
  --text: #1f2937;
  --muted: #64748b;
  --line: #dbe3f0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", Arial, sans-serif;
  color: var(--text);
  background: var(--page-bg);
}

.page {
  width: min(1220px, calc(100% - 24px));
  margin: 0 auto;
  padding: 20px 0 28px;
}

.select-wrap {
  position: relative;
  min-width: 164px;
}

.select-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--text);
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
  width: 100%;
  cursor: pointer;
  outline: none;
}

.select-trigger:focus {
  border-color: var(--muted);
}

.select-icon {
  width: 14px;
  height: 14px;
  color: var(--muted);
  flex: 0 0 auto;
  transition: transform 0.16s ease;
}

.select-wrap.is-open .select-icon {
  transform: rotate(180deg);
}

.select-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  display: none;
  padding: 6px;
  border: 1px solid var(--line);
  background: #ffffff;
  z-index: 10;
}

.select-wrap.is-open .select-menu {
  display: grid;
  gap: 2px;
}

.select-option {
  min-height: 34px;
  padding: 0 10px;
  border: 0;
  background: #ffffff;
  color: var(--text);
  text-align: left;
  font: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
}

.select-option:hover {
  background: #fafafa;
}

.select-option.is-selected {
  font-weight: 600;
}

.subject-panel {
  margin-top: 20px;
}

.phase-stack {
  display: grid;
  gap: 18px;
}

.phase {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 20px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.phase:first-child {
  border-top: 0;
  padding-top: 0;
}

.phase-label {
  display: grid;
  align-content: start;
  gap: 8px;
}

.phase-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  min-height: 32px;
  padding: 0 12px;
  border: 1px solid var(--line);
  background: #ffffff;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.phase-kicker::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: currentColor;
  flex: 0 0 auto;
}

.phase-kicker--foundation {
  color: #2563eb;
}

.phase-kicker--comprehension {
  color: #16a34a;
}

.phase-kicker--depth {
  color: #ca8a04;
}

.phase-kicker--advanced {
  color: #ea580c;
}

.phase-kicker--polish {
  color: #dc2626;
}

.phase-track {
  position: relative;
  display: grid;
  gap: 12px;
  padding-left: 26px;
}

.phase-track::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--line);
}

.phase-item {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: #ffffff;
}

.phase-item::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 18px;
  width: 12px;
  height: 12px;
  border: 2px solid #ffffff;
  border-radius: 999px;
  background: var(--dot-color, #9ca3af);
  box-sizing: border-box;
}

.phase-item--foundation {
  --dot-color: #2563eb;
}

.phase-item--comprehension {
  --dot-color: #16a34a;
}

.phase-item--depth {
  --dot-color: #ca8a04;
}

.phase-item--advanced {
  --dot-color: #ea580c;
}

.phase-item--polish {
  --dot-color: #dc2626;
}

.phase-link {
  flex: 1 1 auto;
  color: var(--text);
  text-decoration: none;
}

.phase-link:hover strong {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.phase-item strong {
  display: block;
  font-size: 0.96rem;
  line-height: 1.35;
  font-weight: 700;
}

.phase-item:hover {
  background: #fafafa;
}

.phase-item--focused {
  border-color: #4ade80;
  background: #dcfce7;
}

.phase-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
}

.phase-check input {
  width: 18px;
  height: 18px;
  margin: 0;
  cursor: pointer;
  accent-color: var(--dot-color, #2563eb);
}

.phase-item.is-complete strong {
  color: var(--muted);
  text-decoration: line-through;
  text-decoration-thickness: 1px;
}

@media (max-width: 900px) {
  .page {
    width: min(100%, calc(100% - 20px));
    padding-top: 16px;
  }

  .phase {
    grid-template-columns: 1fr;
    gap: 14px;
  }
}