/**
 * =============================================================================
 * European Mobility Society (EMoS) — Shared Styles & Layout Rules
 * -----------------------------------------------------------------------------
 * Custom palette CSS variables, sticky always-visible footer shell, adaptive
 * header/popover navigation, institution logo frames, expanding member cards,
 * D3 map markers/links, and opt-in reduced-motion transitions.
 *
 * Copyright (c) 2026 European Mobility Society (EMoS)
 * Project: https://mobilityscience.github.io/EMoS/
 * =============================================================================
 */

:root {
  --ink-900: #0f1b2d;
  --ink-700: #33415a;
  --ink-500: #64748b;
  --brand-700: #052b63;
  --brand-600: #244a8f;
  --brand-500: #2f5aa8;
  --brand-50:  #eef3fb;
  --teal-700:  #066666;
  --teal-600:  #088282;
  --teal-500:  #0aa0a0;
  --teal-50:   #ecfaf9;
  --gold-700:  #8a6514;
  --gold-500:  #d19e2a;
  --surface:   #fbfcfe;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  color: var(--ink-900);
}

body > main {
  flex: 1 0 auto;
}

body > footer {
  flex-shrink: 0;
  background: #ffffff;
}

:where(a, button, input, select):focus-visible {
  outline: 2px solid var(--teal-500);
  outline-offset: 2px;
}

/* ================= NAVBAR (progressive native popover + inline auto-fit) ================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #e2e8f0;
}

.header-inner {
  margin-inline: auto;
  max-inline-size: 72rem;
  padding-inline: 1rem;
  block-size: 4.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

@media (min-width: 640px) {
  .header-inner {
    padding-inline: 1.5rem;
  }
}

.header-inner > * {
  flex-shrink: 0;
  white-space: nowrap;
}

.menu-button {
  anchor-name: --menu-button;
}

.site-menu[popover] {
  position: fixed;
  inset: auto;
  inset-block-start: 4.5rem;
  inset-block-start: anchor(--menu-button bottom);
  inset-inline-end: 1rem;
  inline-size: min(82dvw, 20rem);
  max-inline-size: calc(100dvw - 2rem);
  block-size: fit-content;
  max-block-size: calc(100dvh - 6rem);
  margin-block-start: 0.5rem;
  padding: 0.65rem;
  border-radius: 1rem;
  border: 1px solid #e2e8f0;
  background: #ffffff;
  box-shadow: 0 20px 35px -12px rgba(15, 27, 45, 0.18);
  overflow: auto;
}

.site-menu[popover]:not(:is(:popover-open, .\:popover-open)) {
  display: none;
}

.site-menu[popover]:is(:popover-open, .\:popover-open) {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.site-header.is-wide .menu-button {
  display: none;
}

.site-header.is-wide .site-menu {
  position: static;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.25rem;
  inline-size: auto;
  max-inline-size: none;
  block-size: auto;
  max-block-size: none;
  overflow: visible;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.site-header.is-measuring *,
.site-header.is-measuring *::before,
.site-header.is-measuring *::after {
  transition: none !important;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  border-radius: 0.625rem;
  padding: 0.5rem 0.85rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink-700);
  transition: color 0.15s ease, background-color 0.15s ease;
}

.nav-link:hover {
  color: var(--brand-700);
  background: var(--brand-50);
}

/* Non-color active state + high-contrast color (WCAG 1.4.1) */
.nav-link[aria-current="page"] {
  color: var(--brand-700);
  background: var(--brand-50);
  font-weight: 600;
}

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  inset-inline: 0.85rem;
  inset-block-end: 0.2rem;
  block-size: 2px;
  border-radius: 999px;
  background: var(--teal-600);
}

@media (forced-colors: active) {
  .nav-link[aria-current="page"] {
    outline: 2px solid Highlight;
  }
}

/* ================= LOGO SHOWCASE FRAMES ================= */
.inst-logo-frame {
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 0.75rem;
  padding: 0.45rem 0.65rem;
  overflow: clip;
  flex-shrink: 0;
}

.inst-logo-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* ================= GRIDS & CARDS ================= */
.inst-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
}

.members-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  align-items: start;
  gap: 1.25rem;
}

/* Expanding member card */
.member-details {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.28s ease;
}
.member-details > div {
  overflow: hidden;
}
.member-summary-collapse {
  display: grid;
  grid-template-rows: 1fr;
  transition: grid-template-rows 0.28s ease, opacity 0.2s ease;
}
.member-summary-collapse > div {
  overflow: hidden;
}
.is-expanded .member-details,
.member-details.is-open {
  grid-template-rows: 1fr;
}
.is-expanded .member-summary-collapse {
  grid-template-rows: 0fr;
  opacity: 0;
}
.is-expanded .chevron,
button[aria-expanded="true"] .chevron {
  transform: rotate(180deg);
}

/* Custom-branded filter selects (progressive enhancement via appearance: base-select) */
select.select-clean {
  height: 2.625rem;
  cursor: pointer;
}

@supports (appearance: base-select) {
  select.select-clean,
  select.select-clean::picker(select) {
    appearance: base-select;
  }
  select.select-clean {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.625rem;
    padding: 0 0.875rem;
    background-color: #ffffff;
    overflow: hidden;
    white-space: nowrap;
  }
  select.select-clean button {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.625rem;
    width: 100%;
    min-width: 0;
  }
  select.select-clean selectedcontent {
    display: block;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    text-align: left;
  }
  select.select-clean::picker-icon {
    color: var(--ink-500);
    flex-shrink: 0;
    margin-inline-start: auto;
    transition: transform 0.18s ease, color 0.15s ease;
  }
  select.select-clean:open::picker-icon {
    transform: rotate(180deg);
    color: var(--brand-700);
  }
  select.select-clean::picker(select) {
    margin-block-start: 0.375rem;
    padding: 0.375rem;
    border-radius: 0.75rem;
    border: 1px solid #cbd5e1;
    background-color: #ffffff;
    box-shadow: 0 14px 32px -10px rgba(15, 27, 45, 0.18);
  }
  select.select-clean option {
    padding: 0.45rem 0.65rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    color: var(--ink-900);
    cursor: pointer;
  }
  select.select-clean option:hover,
  select.select-clean option:checked {
    background-color: #eef3fb;
    color: var(--brand-700);
  }
  .select-fallback-icon {
    display: none;
  }
}

@supports not (appearance: base-select) {
  select.select-clean {
    -webkit-appearance: none;
    appearance: none;
    padding-left: 0.875rem;
    padding-right: 2.5rem;
    text-overflow: ellipsis;
  }
}

/* ================= MAP ================= */
#map-svg {
  display: block;
  width: 100%;
  height: auto;
  touch-action: none;
}

.sea { fill: #f4f7fb; }
.country { fill: #e7ecf3; stroke: #ffffff; stroke-width: 0.7; vector-effect: non-scaling-stroke; }
.country.has-node { fill: #d6e0f0; }

.link {
  fill: none;
  stroke: #052b63;
  stroke-width: 1.3;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
  opacity: 0.16;
  pointer-events: none;
  transition: opacity 0.25s ease, stroke-width 0.15s ease, stroke 0.2s ease;
}
#map-svg.has-selection .link:not(.is-candidate):not(.is-shown) {
  opacity: 0.04;
}
.link.is-candidate {
  stroke: #0aa0a0;
  stroke-width: 2.3;
  stroke-dasharray: 6 6;
  opacity: 0.75;
  pointer-events: stroke;
  cursor: pointer;
}
.link.is-candidate:hover {
  opacity: 1;
  stroke-width: 3.4;
}
.link.is-shown {
  stroke: #d19e2a;
  stroke-width: 3.5;
  opacity: 1;
}

.marker { cursor: pointer; outline: none; transition: opacity 0.2s; }
.marker circle.ring { fill: #ffffff; stroke: #052b63; stroke-width: 2.5; transition: r 0.15s, fill 0.15s, stroke 0.15s; }
.marker text { font-family: Inter, sans-serif; font-weight: 700; fill: #052b63; pointer-events: none; transition: fill 0.15s; }
.marker:hover circle.ring, .marker:focus-visible circle.ring { r: 19; }
.marker.is-selected circle.ring { fill: #052b63; r: 19; }
.marker.is-selected text { fill: #ffffff; }
.marker.is-candidate circle.ring { fill: #f0fbfb; stroke: #0aa0a0; stroke-width: 3; }
.marker.is-pair circle.ring { fill: #d19e2a; stroke: #d19e2a; r: 19; }
.marker.is-pair text { fill: #ffffff; }
.marker.is-dim { opacity: 0.25; }
.marker .pulse { fill: none; stroke: #0aa0a0; stroke-width: 2.2; opacity: 0; }

#node-popup { transition: opacity 0.15s; }
#node-popup.docked {
  left: 8px !important;
  right: 8px;
  top: auto !important;
  bottom: 8px;
  width: auto;
}

#panel { transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1); }
#panel.closed { transform: translateY(105%); }
@media (min-width: 768px) {
  #panel.closed { transform: translateX(110%); }
}
#backdrop { transition: opacity 0.3s; }

/* ================= MOTION (opt-in only) ================= */
@media (prefers-reduced-motion: no-preference) {
  .marker.is-selected .pulse { animation: pulse 1.6s ease-out infinite; }
  .link.is-shown { stroke-dasharray: 10 6; animation: linkFlow 1.4s linear infinite; }
  .page-enter { animation: pageIn 0.28s ease-out both; }
  .card-lift { transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease; }
  .card-lift:hover { transform: translateY(-2px); }
}

@keyframes pulse { 0% { r: 19; opacity: 0.75; } 100% { r: 38; opacity: 0; } }
@keyframes linkFlow { from { stroke-dashoffset: 32; } to { stroke-dashoffset: 0; } }
@keyframes pageIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }