:root {
  --platform-navy-950: #0b1f33;
  --platform-navy-900: #102a43;
  --platform-blue-700: #1769aa;
  --platform-blue-600: #2484c6;
  --platform-teal-600: #008b8b;
  --platform-teal-500: #12a7a1;
  --platform-surface: #ffffff;
  --platform-surface-soft: #f5f8fb;
  --platform-surface-muted: #edf3f8;
  --platform-border: #d8e3ec;
  --platform-text: #172b3a;
  --platform-text-muted: #607487;
  --platform-success: #15803d;
  --platform-warning: #b45309;
  --platform-danger: #b42318;
  --platform-info: #1769aa;
  --platform-radius-sm: .65rem;
  --platform-radius: .95rem;
  --platform-radius-lg: 1.25rem;
  --platform-shadow-sm: 0 3px 12px rgba(16, 42, 67, .07);
  --platform-shadow: 0 12px 32px rgba(16, 42, 67, .10);
  --platform-sidebar-width: 17rem;
  --platform-topbar-height: 4.5rem;
  --platform-content-max: 1500px;
  --platform-focus: 0 0 0 .23rem rgba(36, 132, 198, .24);
}

html { scroll-behavior: smooth; }
body.platform-ui {
  color: var(--platform-text);
  background: var(--platform-surface-soft);
  font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
  min-height: 100vh;
}
body.platform-ui * { box-sizing: border-box; }
body.platform-ui a { color: var(--platform-blue-700); }
body.platform-ui a:hover { color: var(--platform-navy-900); }
body.platform-ui :focus-visible {
  outline: 2px solid var(--platform-blue-600);
  outline-offset: 2px;
  box-shadow: var(--platform-focus);
}
body.platform-ui .skip-link {
  position: fixed;
  top: .75rem;
  left: .75rem;
  z-index: 10000;
  transform: translateY(-150%);
  padding: .75rem 1rem;
  border-radius: var(--platform-radius-sm);
  background: var(--platform-navy-950);
  color: white;
  transition: transform .18s ease;
}
body.platform-ui .skip-link:focus { transform: translateY(0); }

body.platform-ui #content-wrapper,
body.platform-ui #content { background: var(--platform-surface-soft) !important; }
body.platform-ui #content > .container-fluid,
body.platform-ui main .container-fluid {
  width: min(100%, var(--platform-content-max));
  margin-inline: auto;
  padding: clamp(1rem, 2vw, 2rem);
}
body.platform-ui .topbar,
body.platform-ui nav.navbar {
  min-height: var(--platform-topbar-height);
  background: rgba(255,255,255,.96) !important;
  border-bottom: 1px solid var(--platform-border);
  box-shadow: 0 2px 10px rgba(16,42,67,.05) !important;
  backdrop-filter: blur(12px);
}
body.platform-ui .sidebar {
  width: var(--platform-sidebar-width) !important;
  min-width: var(--platform-sidebar-width);
  background: var(--platform-navy-950) !important;
  background-image: none !important;
  border-right: 1px solid rgba(255,255,255,.08);
}
body.platform-ui .sidebar-brand {
  min-height: 5.25rem;
  border-bottom: 1px solid rgba(255,255,255,.1);
  text-decoration: none;
}
body.platform-ui .sidebar .sidebar-brand-text,
body.platform-ui .sidebar .sidebar-brand-icon { color: white; }
body.platform-ui .sidebar .nav-link {
  width: calc(100% - 1rem) !important;
  margin: .15rem .5rem;
  padding: .78rem .85rem !important;
  border-radius: .75rem;
  color: rgba(255,255,255,.78) !important;
  min-height: 44px;
  display: flex !important;
  align-items: center;
  gap: .75rem;
}
body.platform-ui .sidebar .nav-link i { color: rgba(255,255,255,.58) !important; width: 1.2rem; text-align: center; }
body.platform-ui .sidebar .nav-item.active > .nav-link,
body.platform-ui .sidebar .nav-link:hover,
body.platform-ui .sidebar .nav-link[aria-current="page"] {
  color: white !important;
  background: rgba(18,167,161,.17);
}
body.platform-ui .sidebar .nav-item.active > .nav-link i,
body.platform-ui .sidebar .nav-link:hover i { color: #65ddd5 !important; }
body.platform-ui .sidebar-heading {
  color: rgba(255,255,255,.48) !important;
  font-size: .68rem;
  letter-spacing: .11em;
  margin-top: 1rem;
}
body.platform-ui .sidebar-divider { border-color: rgba(255,255,255,.1) !important; }
@media (min-width: 992px) {
  body.platform-ui.sidebar-collapsed .sidebar {
    width: 5.25rem !important;
    min-width: 5.25rem;
  }
  body.platform-ui.sidebar-collapsed .sidebar .sidebar-brand-text,
  body.platform-ui.sidebar-collapsed .sidebar .sidebar-heading,
  body.platform-ui.sidebar-collapsed .sidebar .nav-link span,
  body.platform-ui.sidebar-collapsed .sidebar .collapse,
  body.platform-ui.sidebar-collapsed .sidebar .sidebar-divider {
    display: none !important;
  }
  body.platform-ui.sidebar-collapsed .sidebar .nav-link {
    width: calc(100% - .7rem) !important;
    margin-inline: .35rem;
    justify-content: center;
    padding-inline: .6rem !important;
  }
  body.platform-ui.sidebar-collapsed .sidebar .nav-link i { width: auto; font-size: 1.05rem; }
  body.platform-ui.sidebar-collapsed .sidebar-brand { min-height: 4.75rem; }
}

body.platform-ui .card,
body.platform-ui .content-panel-shell,
body.platform-ui .stat-card,
body.platform-ui .academic-filter-card,
.platform-card {
  border: 1px solid var(--platform-border) !important;
  border-radius: var(--platform-radius) !important;
  background: var(--platform-surface) !important;
  box-shadow: var(--platform-shadow-sm) !important;
}
body.platform-ui .card-header {
  background: transparent !important;
  border-bottom: 1px solid var(--platform-border) !important;
  padding: 1rem 1.15rem;
}
body.platform-ui .card-body { padding: 1.15rem; }
body.platform-ui h1, body.platform-ui h2, body.platform-ui h3,
body.platform-ui h4, body.platform-ui h5, body.platform-ui h6 {
  color: var(--platform-navy-900);
  font-weight: 700;
  letter-spacing: -.015em;
}
body.platform-ui .text-gray-800,
body.platform-ui .text-dark { color: var(--platform-navy-900) !important; }
body.platform-ui .text-gray-600,
body.platform-ui .text-muted { color: var(--platform-text-muted) !important; }

body.platform-ui .btn {
  min-height: 42px;
  border-radius: .7rem;
  font-weight: 650;
  padding: .62rem .95rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  box-shadow: none !important;
}
body.platform-ui .btn-sm { min-height: 36px; padding: .45rem .7rem; }
body.platform-ui .btn-primary,
body.platform-ui .btn-info {
  background: var(--platform-blue-700) !important;
  border-color: var(--platform-blue-700) !important;
  color: white !important;
}
body.platform-ui .btn-primary:hover,
body.platform-ui .btn-info:hover { background: var(--platform-navy-900) !important; border-color: var(--platform-navy-900) !important; }
body.platform-ui .btn-success { background: var(--platform-success) !important; border-color: var(--platform-success) !important; }
body.platform-ui .btn-warning { background: #f59e0b !important; border-color: #f59e0b !important; color: #2b1b00 !important; }
body.platform-ui .btn-danger { background: var(--platform-danger) !important; border-color: var(--platform-danger) !important; }
body.platform-ui .btn-outline-primary { color: var(--platform-blue-700); border-color: var(--platform-blue-700); }
body.platform-ui .btn-outline-primary:hover { background: var(--platform-blue-700); color: white; }

body.platform-ui .form-control,
body.platform-ui .form-select,
body.platform-ui select,
body.platform-ui textarea,
body.platform-ui input:not([type="checkbox"]):not([type="radio"]):not([type="file"]) {
  min-height: 44px;
  border-radius: .72rem !important;
  border: 1px solid #c9d7e2 !important;
  color: var(--platform-text);
  background-color: white;
}
body.platform-ui textarea { min-height: 110px; }
body.platform-ui .form-control:focus,
body.platform-ui .form-select:focus,
body.platform-ui select:focus,
body.platform-ui textarea:focus,
body.platform-ui input:focus {
  border-color: var(--platform-blue-600) !important;
  box-shadow: var(--platform-focus) !important;
}
body.platform-ui label, body.platform-ui .form-label { color: var(--platform-navy-900); font-weight: 650; }
body.platform-ui .form-text { color: var(--platform-text-muted); }
body.platform-ui input[type="file"] { padding: .55rem; border-radius: .72rem; border: 1px dashed #9eb4c5; background: #f8fbfd; }

body.platform-ui .table-responsive {
  border: 1px solid var(--platform-border);
  border-radius: var(--platform-radius);
  background: white;
}
body.platform-ui .table { margin-bottom: 0; color: var(--platform-text); }
body.platform-ui .table thead th {
  background: #eff5f9;
  color: var(--platform-navy-900);
  border-bottom: 1px solid var(--platform-border);
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  white-space: nowrap;
}
body.platform-ui .table td { vertical-align: middle; border-color: #edf2f6; }

body.platform-ui .badge,
.platform-status-badge {
  border-radius: 999px;
  padding: .42rem .68rem;
  font-weight: 700;
  letter-spacing: .01em;
}
.platform-status-badge[data-status="active"] { background: #dcfce7; color: #166534; }
.platform-status-badge[data-status="draft"] { background: #e0f2fe; color: #075985; }
.platform-status-badge[data-status="closed"] { background: #fef3c7; color: #92400e; }
.platform-status-badge[data-status="archived"] { background: #e5e7eb; color: #374151; }
.platform-status-badge[data-status="legacy-unassigned"] { background: #fee2e2; color: #991b1b; }

body.platform-ui .modal { padding: .75rem !important; }
body.platform-ui .modal-dialog {
  margin: .75rem auto;
  max-height: calc(100dvh - 1.5rem);
  display: flex;
  align-items: center;
}
body.platform-ui .modal-content {
  max-height: calc(100dvh - 1.5rem);
  border: 0;
  border-radius: var(--platform-radius-lg);
  box-shadow: 0 24px 70px rgba(11,31,51,.24);
  overflow: hidden;
}
body.platform-ui .modal-header,
body.platform-ui .modal-footer { flex: 0 0 auto; background: white; border-color: var(--platform-border); }
body.platform-ui .modal-body { overflow-y: auto; overscroll-behavior: contain; padding: 1.2rem; }
body.platform-ui .modal-footer { position: sticky; bottom: 0; z-index: 2; }
body.platform-ui .modal-backdrop.show { opacity: .46; }

.platform-period-strip {
  position: relative;
  z-index: 4;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin: 0 auto 1rem;
  padding: .8rem 1rem;
  border: 1px solid #b9d8e9;
  border-left: 4px solid var(--platform-teal-500);
  border-radius: var(--platform-radius);
  background: #f0fbfb;
  color: var(--platform-navy-900);
}
.platform-period-strip.is-warning { border-color: #f5d08a; border-left-color: #f59e0b; background: #fffbeb; }
.platform-period-strip__main { display: flex; align-items: center; gap: .8rem; min-width: 0; }
.platform-period-strip__icon {
  width: 2.4rem; height: 2.4rem; flex: 0 0 auto; border-radius: .75rem;
  display: grid; place-items: center; background: white; color: var(--platform-teal-600);
  box-shadow: var(--platform-shadow-sm);
}
.platform-period-strip__title { font-weight: 800; line-height: 1.2; }
.platform-period-strip__meta { color: var(--platform-text-muted); font-size: .86rem; }

.platform-academic-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(260px, .6fr);
  gap: 1rem;
  margin: 0 0 1.25rem;
}
.platform-academic-card { padding: 1.15rem; }
.platform-academic-card--accent {
  background: linear-gradient(135deg, var(--platform-navy-950), var(--platform-navy-900)) !important;
  color: white;
  border: 0 !important;
}
.platform-academic-card--accent h2,
.platform-academic-card--accent h3,
.platform-academic-card--accent .platform-muted { color: white !important; }
.platform-academic-kicker { font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; font-weight: 800; opacity: .78; }
.platform-academic-code { font-size: clamp(1.65rem, 3vw, 2.35rem); font-weight: 850; margin: .2rem 0; }
.platform-muted { color: var(--platform-text-muted); }
.platform-deadline-list { display: grid; gap: .55rem; margin: .85rem 0 0; }
.platform-deadline { display: flex; justify-content: space-between; gap: 1rem; padding: .58rem .7rem; border-radius: .7rem; background: rgba(255,255,255,.11); }

.platform-timeline { display: grid; grid-template-columns: repeat(9, minmax(100px, 1fr)); gap: .45rem; overflow-x: auto; padding: .25rem 0 .65rem; scrollbar-width: thin; }
.platform-timeline-step { min-width: 105px; padding: .7rem; border: 1px solid var(--platform-border); border-radius: .78rem; background: white; }
.platform-timeline-step__index { width: 1.75rem; height: 1.75rem; border-radius: 999px; display: grid; place-items: center; background: var(--platform-surface-muted); color: var(--platform-text-muted); font-weight: 800; font-size: .78rem; margin-bottom: .4rem; }
.platform-timeline-step.is-complete { border-color: #86d6a2; background: #f0fdf4; }
.platform-timeline-step.is-complete .platform-timeline-step__index { background: var(--platform-success); color: white; }
.platform-timeline-step.is-current { border-color: #6eb5df; background: #eff8ff; box-shadow: inset 0 0 0 1px #6eb5df; }
.platform-timeline-step.is-current .platform-timeline-step__index { background: var(--platform-blue-700); color: white; }
.platform-timeline-step.is-blocked { opacity: .62; }
.platform-timeline-step__label { font-size: .8rem; font-weight: 750; line-height: 1.25; }
.platform-timeline-step__status { font-size: .7rem; color: var(--platform-text-muted); margin-top: .25rem; }

.platform-history { margin-top: 1.25rem; }
.platform-history-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1rem; }
.platform-history-card { padding: 1rem; }
.platform-history-card__head { display: flex; justify-content: space-between; gap: .8rem; align-items: flex-start; }
.platform-history-card__links { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .8rem; }
.platform-history-card__links a { text-decoration: none; font-weight: 700; font-size: .83rem; padding: .45rem .65rem; border-radius: .6rem; border: 1px solid var(--platform-border); background: #f8fbfd; }

.platform-empty-state,
.platform-error-state,
.platform-loading-state { text-align: center; padding: 2.4rem 1rem; border: 1px dashed #b8c8d5; border-radius: var(--platform-radius); background: #fbfdff; color: var(--platform-text-muted); }
.platform-empty-state i,
.platform-error-state i,
.platform-loading-state i { font-size: 1.55rem; margin-bottom: .6rem; color: var(--platform-blue-700); }
.platform-skeleton { position: relative; overflow: hidden; background: #e8eff4; border-radius: .45rem; min-height: 1rem; }
.platform-skeleton::after { content: ""; position: absolute; inset: 0; transform: translateX(-100%); background: linear-gradient(90deg, transparent, rgba(255,255,255,.65), transparent); animation: platform-shimmer 1.25s infinite; }
@keyframes platform-shimmer { to { transform: translateX(100%); } }

.platform-period-admin { display: none; }
.platform-period-admin.is-visible { display: block; }
.platform-period-toolbar { display: flex; flex-wrap: wrap; gap: .75rem; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.platform-period-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 1rem; }
.platform-period-card { padding: 1rem; position: relative; overflow: hidden; }
.platform-period-card.is-active { border-color: #74c9c4 !important; box-shadow: 0 0 0 2px rgba(18,167,161,.1), var(--platform-shadow-sm) !important; }
.platform-period-card__head { display: flex; justify-content: space-between; gap: .75rem; }
.platform-period-card__code { font-size: 1.25rem; font-weight: 850; color: var(--platform-navy-900); }
.platform-period-card__name { color: var(--platform-text-muted); font-size: .9rem; }
.platform-period-card__stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: .45rem; margin: .85rem 0; }
.platform-mini-stat { text-align: center; padding: .55rem .25rem; border-radius: .7rem; background: var(--platform-surface-soft); }
.platform-mini-stat strong { display: block; color: var(--platform-navy-900); font-size: 1.05rem; }
.platform-mini-stat span { font-size: .67rem; color: var(--platform-text-muted); }
.platform-period-card__actions { display: flex; flex-wrap: wrap; gap: .45rem; }
.platform-audit-meta { display: grid; gap: .25rem; padding-top: .7rem; border-top: 1px solid var(--platform-border); font-size: .76rem; color: var(--platform-text-muted); }

.platform-role-switch { display: inline-flex; gap: .35rem; padding: .35rem; border: 1px solid var(--platform-border); border-radius: .85rem; background: white; }
.platform-role-switch button { border: 0; background: transparent; border-radius: .62rem; padding: .55rem .8rem; font-weight: 750; color: var(--platform-text-muted); }
.platform-role-switch button.is-active { background: var(--platform-navy-900); color: white; }

body.platform-ui .dropdown-menu { border: 1px solid var(--platform-border); border-radius: var(--platform-radius); box-shadow: var(--platform-shadow); }
body.platform-ui .toast-container { z-index: 11000; }

@media (max-width: 991.98px) {
  :root { --platform-sidebar-width: min(19rem, 88vw); }
  body.platform-ui .sidebar {
    position: fixed !important;
    inset: 0 auto 0 0;
    z-index: 1050;
    transform: translateX(-102%);
    transition: transform .22s ease;
    overflow-y: auto;
  }
  body.platform-ui.sidebar-open .sidebar,
  body.platform-ui .sidebar.show-mobile { transform: translateX(0); }
  body.platform-ui.sidebar-open::after {
    content: ""; position: fixed; inset: 0; z-index: 1040; background: rgba(11,31,51,.52);
  }
  body.platform-ui #content-wrapper { width: 100% !important; }
  .platform-academic-hero { grid-template-columns: 1fr; }
  .platform-period-strip { align-items: flex-start; }
}

@media (max-width: 767.98px) {
  body.platform-ui #content > .container-fluid,
  body.platform-ui main .container-fluid { padding: .9rem; }
  body.platform-ui .modal { padding: 0 !important; }
  body.platform-ui .modal-dialog { margin: 0; width: 100%; max-width: none; min-height: 100dvh; align-items: flex-end; }
  body.platform-ui .modal-content { width: 100%; max-height: 96dvh; border-radius: 1.1rem 1.1rem 0 0; }
  body.platform-ui .modal-footer { display: grid; grid-template-columns: 1fr; }
  body.platform-ui .modal-footer .btn { width: 100%; }
  .platform-period-strip { flex-direction: column; }
  .platform-period-card__stats { grid-template-columns: repeat(2, 1fr); }
  .platform-period-grid, .platform-history-grid { grid-template-columns: 1fr; }
  body.platform-ui .table-responsive { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  body.platform-ui .academic-filter-row { flex-direction: column !important; align-items: stretch !important; }
  body.platform-ui .academic-filter-btn, body.platform-ui .academic-period-select { width: 100% !important; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

/* Formularios académicos compartidos */
.platform-field-counter {
  margin-top: .35rem;
  text-align: right;
  color: var(--platform-text-muted);
  font-size: .75rem;
  font-weight: 650;
}
.platform-dropzone {
  padding: .65rem;
  border: 1px dashed #9eb4c5;
  border-radius: .85rem;
  background: #f8fbfd;
  transition: border-color .18s ease, background-color .18s ease, box-shadow .18s ease;
}
.platform-dropzone.is-dragging {
  border-color: var(--platform-teal-500);
  background: #ecfdfb;
  box-shadow: 0 0 0 3px rgba(18, 167, 161, .12);
}
.platform-dropzone > input[type="file"] {
  width: 100%;
  border: 0 !important;
  background: transparent !important;
}
.platform-file-summary {
  display: flex;
  align-items: center;
  gap: .65rem;
  margin-top: .55rem;
  padding: .65rem;
  border-radius: .7rem;
  background: white;
  border: 1px solid var(--platform-border);
  min-width: 0;
}
.platform-file-summary > span:nth-child(2) { min-width: 0; flex: 1; }
.platform-file-summary strong,
.platform-file-summary small { display: block; overflow-wrap: anywhere; }
.platform-file-summary small { color: var(--platform-text-muted); margin-top: .12rem; }
.platform-file-summary.is-success { border-color: #86d6a2; background: #f0fdf4; }
.platform-file-summary.is-error { border-color: #f0a2a2; background: #fff5f5; color: #991b1b; }
.platform-file-icon {
  width: 2.1rem;
  height: 2.1rem;
  border-radius: .65rem;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  background: var(--platform-surface-soft);
  color: var(--platform-blue-700);
}
.platform-draft-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
  padding: .85rem 1rem;
  border: 1px solid #b9d8e9;
  border-left: 4px solid var(--platform-blue-700);
  border-radius: .8rem;
  background: #eff8ff;
  color: var(--platform-navy-900);
}
@media (max-width: 575.98px) {
  .platform-draft-banner { align-items: stretch; flex-direction: column; }
  .platform-file-summary { align-items: flex-start; }
}
.platform-history-details {
  border: 1px solid var(--platform-border);
  border-radius: .7rem;
  padding: .65rem .75rem;
  background: #fbfdff;
}
.platform-history-details summary { cursor: pointer; color: var(--platform-navy-900); font-weight: 750; }
.platform-history-observation { padding: .5rem 0; border-top: 1px solid #edf2f6; color: var(--platform-text); font-size: .84rem; }
.platform-history-observation:first-child { border-top: 0; }