:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --text: #182230;
  --muted: #667085;
  --line: #d0d5dd;
  --primary: #175cd3;
  --primary-soft: #eff8ff;
  --primary-border: #53b1fd;
  --success: #067647;
  --success-bg: #ecfdf3;
  --success-border: #17b26a;
  --danger: #b42318;
  --danger-bg: #fef3f2;
  --danger-border: #f04438;
  --locked: #667085;
  --locked-bg: #f2f4f7;
  --shadow: 0 1px 3px rgba(16, 24, 40, .12), 0 1px 2px rgba(16, 24, 40, .08);
  --shadow-lg: 0 12px 28px rgba(16, 24, 40, .18);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

.skip-link {
  position: fixed;
  left: 12px;
  top: -80px;
  z-index: 1000;
  padding: 10px 14px;
  background: #101828;
  color: #fff;
  border-radius: 8px;
}

.skip-link:focus {
  top: 12px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  padding: 22px clamp(16px, 3vw, 38px) 16px;
  background: rgba(255, 255, 255, .96);
  border-bottom: 1px solid #e4e7ec;
  backdrop-filter: blur(10px);
}

.brand {
  max-width: 900px;
}

.eyebrow {
  margin: 0 0 3px;
  color: var(--primary);
  font-size: .8rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(1.35rem, 2.4vw, 2rem);
  line-height: 1.15;
}

.subtitle {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: .95rem;
}

.summary {
  display: grid;
  grid-template-columns: repeat(4, minmax(120px, 1fr));
  gap: 10px;
  margin-top: 18px;
}

.summary article {
  display: flex;
  flex-direction: column;
  padding: 11px 13px;
  border: 1px solid #e4e7ec;
  border-radius: 11px;
  background: #fff;
}

.summary strong {
  font-size: 1.1rem;
}

.summary span {
  margin-top: 2px;
  color: var(--muted);
  font-size: .77rem;
}

.progress-track {
  overflow: hidden;
  height: 7px;
  margin-top: 10px;
  border-radius: 999px;
  background: #eaecf0;
}

#progress-bar {
  width: 0;
  height: 100%;
  background: var(--success);
  transition: width .25s ease;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 14px;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 650;
  font-size: .9rem;
}

.toggle input {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
}

.toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 8px 12px;
  border: 1px solid #d0d5dd;
  border-radius: 9px;
  background: #fff;
  cursor: pointer;
  font-weight: 700;
  font-size: .82rem;
  box-shadow: 0 1px 1px rgba(16, 24, 40, .03);
}

.btn:hover {
  background: #f9fafb;
}

.btn:focus-visible,
.course:focus-visible,
.state-menu button:focus-visible {
  outline: 3px solid rgba(83, 177, 253, .45);
  outline-offset: 2px;
}

.btn.danger {
  color: var(--danger);
  border-color: #fecdca;
}

.file-btn {
  user-select: none;
}

main {
  padding: 16px 0 34px;
}

.notice {
  margin: 0 clamp(16px, 3vw, 38px) 12px;
  padding: 11px 14px;
  border: 1px solid #b2ddff;
  border-radius: 10px;
  background: #eff8ff;
  color: #1849a9;
  font-size: .9rem;
}

.curriculum {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 264px;
  align-items: start;
  gap: 13px;
  overflow-x: auto;
  padding: 4px clamp(16px, 3vw, 38px) 22px;
  scroll-snap-type: x proximity;
  scrollbar-color: #98a2b3 transparent;
}

.semester {
  min-height: 260px;
  padding: 11px;
  border: 1px solid #e4e7ec;
  border-radius: 14px;
  background: rgba(255, 255, 255, .72);
  scroll-snap-align: start;
}

.semester-header {
  position: static;
  top: 248px;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: -11px -11px 11px;
  padding: 11px 12px;
  border-bottom: 1px solid #e4e7ec;
  border-radius: 14px 14px 0 0;
  background: #f8fafc;
}

.semester-header h2 {
  margin: 0;
  font-size: .95rem;
}

.semester-header span {
  color: var(--muted);
  font-size: .72rem;
}

.course-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.course {
  position: relative;
  width: 100%;
  min-height: 74px;
  padding: 11px 11px 10px;
  border: 2px solid transparent;
  border-radius: 11px;
  text-align: left;
  background: var(--surface);
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform .12s ease, box-shadow .12s ease, opacity .12s ease, border-color .12s ease;
}

.course:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(16, 24, 40, .13);
}

.course-name {
  display: block;
  padding-right: 26px;
  font-size: .88rem;
  font-weight: 760;
  line-height: 1.28;
}

.course-meta {
  display: block;
  margin-top: 7px;
  color: var(--muted);
  font-size: .7rem;
  line-height: 1.25;
}

.course-icon {
  position: absolute;
  top: 9px;
  right: 9px;
  font-size: 1rem;
  font-weight: 900;
}

.course[data-state="disponible"] {
  border-color: var(--primary-border);
  background: var(--primary-soft);
}

.course[data-state="disponible"] .course-icon {
  color: var(--primary);
}

.course[data-state="aprobado"] {
  border-color: var(--success-border);
  background: var(--success-bg);
}

.course[data-state="aprobado"] .course-icon {
  color: var(--success);
}

.course[data-state="reprobado"] {
  border-color: var(--danger-border);
  background: var(--danger-bg);
}

.course[data-state="reprobado"] .course-icon {
  color: var(--danger);
}

.course[data-state="bloqueado"] {
  border-color: #d0d5dd;
  background: var(--locked-bg);
  color: #667085;
  opacity: .7;
  cursor: not-allowed;
}

.course.related-prereq {
  border-color: #7f56d9 !important;
  box-shadow: 0 0 0 3px rgba(127, 86, 217, .18), var(--shadow);
}

.course.related-unlocks {
  border-color: #f79009 !important;
  box-shadow: 0 0 0 3px rgba(247, 144, 9, .18), var(--shadow);
}

.course.related-focus {
  box-shadow: 0 0 0 4px rgba(23, 92, 211, .2), var(--shadow-lg);
}

.course.filtered-out {
  display: none;
}

.state-menu {
  position: fixed;
  z-index: 100;
  min-width: 178px;
  padding: 6px;
  border: 1px solid #d0d5dd;
  border-radius: 11px;
  background: #fff;
  box-shadow: var(--shadow-lg);
}

.state-menu button {
  width: 100%;
  padding: 9px 10px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  text-align: left;
  cursor: pointer;
  font-weight: 700;
  font-size: .84rem;
}

.state-menu button:hover {
  background: #f2f4f7;
}

.state-menu button[data-action="aprobado"] {
  color: var(--success);
}

.state-menu button[data-action="reprobado"] {
  color: var(--danger);
}

.empty-semester {
  padding: 20px 8px;
  color: var(--muted);
  text-align: center;
  font-size: .8rem;
}

@media (max-width: 760px) {
  .topbar {
    position: relative;
    padding: 17px 14px 13px;
  }

  .summary {
    grid-template-columns: repeat(2, 1fr);
  }

  .toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .toolbar-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .btn {
    width: 100%;
  }

  .curriculum {
    grid-auto-columns: 82vw;
    max-width: 100vw;
    padding-left: 14px;
    padding-right: 14px;
  }

  .semester-header {
    position: static;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}