/* ==========================================================================
   German University Research Manager — Design System
   A calm, institutional interface for a personal admissions research
   tool. One serif accent carries the brand and the numbers that matter;
   everything else stays a disciplined, legible sans for the dense forms
   and tables this app lives in. Motion is purposeful: one orchestrated
   entrance on the dashboard, a slow pulse only on genuinely urgent
   deadlines, and calm, consistent hover/focus feedback everywhere else.
   ========================================================================== */

:root {
  /* Ink & surfaces */
  --bg: #F5F5F1;
  --surface: #FFFFFF;
  --surface-alt: #EFEEE8;
  --ink: #1B2430;
  --ink-muted: #62697A;
  --ink-faint: #939AA8;
  --border: #E2E0D7;
  --border-strong: #CFCCC0;

  /* Brand */
  --primary: #1F3D5C;
  --primary-dark: #16293E;
  --primary-soft: #E7EDF3;
  --accent: #A9762F;
  --accent-soft: #F3E8D3;

  /* Semantic */
  --success: #2E6E52;
  --success-soft: #E3F0EA;
  --danger: #A8392F;
  --danger-soft: #F6E4E1;
  --warning: #A9762F;
  --warning-soft: #F3E8D3;
  --info: #2E6483;
  --info-soft: #E3EDF3;

  /* Type */
  --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'IBM Plex Serif', Georgia, 'Times New Roman', serif;

  /* Scale */
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --shadow-1: 0 1px 2px rgba(27, 36, 48, 0.06);
  --shadow-2: 0 4px 16px rgba(27, 36, 48, 0.08);
  --shadow-3: 0 12px 32px rgba(27, 36, 48, 0.14);

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur-fast: 140ms;
  --dur: 240ms;
  --dur-slow: 480ms;

  --sidebar-width: 296px;
}

[data-bs-theme="dark"] {
  --bg: #12151B;
  --surface: #1A1E26;
  --surface-alt: #20242D;
  --ink: #E8E9ED;
  --ink-muted: #9BA2B0;
  --ink-faint: #6B7280;
  --border: #2A2F3A;
  --border-strong: #3A4150;

  --primary: #7FA6D1;
  --primary-dark: #5C87B5;
  --primary-soft: #1E2A3A;
  --accent: #D9A75C;
  --accent-soft: #332711;

  --success: #6FBB98;
  --success-soft: #16261F;
  --danger: #E08579;
  --danger-soft: #2E1B18;
  --warning: #D9A75C;
  --warning-soft: #332711;
  --info: #7FB4D9;
  --info-soft: #16232C;

  --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-2: 0 4px 20px rgba(0, 0, 0, 0.35);
  --shadow-3: 0 16px 40px rgba(0, 0, 0, 0.5);
}

/* Respect reduced-motion globally */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------------------------------------------------------------------
   Base
   --------------------------------------------------------------------- */
html { scroll-behavior: smooth; }

body {
  background-color: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 0.945rem;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--ink);
  font-weight: 600;
  letter-spacing: -0.01em;
}

a { color: var(--primary); }
a:hover { color: var(--primary-dark); }

::selection { background: var(--accent-soft); color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.text-muted { color: var(--ink-muted) !important; }

/* ---------------------------------------------------------------------
   Navbar & brand
   --------------------------------------------------------------------- */
.app-navbar {
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-1);
  z-index: 1040;
  padding-top: 0.55rem;
  padding-bottom: 0.55rem;
}

.navbar-brand {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0;
}
.brand-mark { font-size: 1.15rem; line-height: 1; }
.brand-word {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.brand-word em { font-style: italic; color: var(--ink-muted); font-weight: 500; }

.global-search-form input {
  border-radius: 999px;
  border-color: var(--border);
  background: var(--surface-alt);
  transition: box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.global-search-form input:focus {
  background: var(--surface);
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}

#themeToggleBtn {
  border-color: var(--border);
  color: var(--ink-muted);
  transition: transform var(--dur) var(--ease), color var(--dur-fast) linear, border-color var(--dur-fast) linear;
}
#themeToggleBtn:hover { color: var(--accent); border-color: var(--accent); transform: rotate(-12deg); }

.user-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink);
  border-radius: 999px;
  padding: 0.28rem 0.75rem 0.28rem 0.28rem;
  transition: border-color var(--dur-fast) linear, box-shadow var(--dur) var(--ease);
}
.user-chip:hover { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); color: var(--ink); }
.user-chip-avatar {
  width: 1.6rem; height: 1.6rem;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 0.8rem;
  font-weight: 600;
  flex-shrink: 0;
}
.role-pill-admin {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.68rem;
}

/* ---------------------------------------------------------------------
   Impersonation banner
   --------------------------------------------------------------------- */
.impersonation-banner {
  background: var(--accent-soft);
  border-bottom: 1px solid var(--border-strong);
  color: var(--ink);
  padding: 0.55rem 1rem;
  font-size: 0.87rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  animation: dropIn var(--dur-slow) var(--ease);
}
.impersonation-banner i { color: var(--accent); }

/* ---------------------------------------------------------------------
   Shell layout
   --------------------------------------------------------------------- */
.app-shell { display: flex; min-height: calc(100vh - 56px); }

.app-sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background-color: var(--surface);
  border-right: 1px solid var(--border);
  position: sticky;
  top: 56px;
  height: calc(100vh - 56px);
  overflow: hidden;
}
.sidebar-scroll { height: 100%; overflow-y: auto; padding: 0.85rem 0.6rem 2rem; }
.app-main { flex-grow: 1; min-width: 0; }

.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 56px 0 0 0;
  background: rgba(15, 18, 24, 0.45);
  z-index: 1030;
}
@media (max-width: 991.98px) {
  .app-sidebar {
    position: fixed; left: -100%; top: 56px;
    height: calc(100vh - 56px); z-index: 1035;
    transition: left var(--dur-slow) var(--ease);
    box-shadow: var(--shadow-3);
  }
  .app-sidebar.show { left: 0; }
  .sidebar-backdrop.show { display: block; }
}

/* ---------------------------------------------------------------------
   Sidebar navigation + tree
   --------------------------------------------------------------------- */
.sidebar-section-title {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--ink-faint);
  padding: 0.4rem 0.65rem 0.3rem;
  letter-spacing: 0.02em;
}

.top-nav .nav-link {
  color: var(--ink);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.7rem;
  font-size: 0.91rem;
  font-weight: 500;
  border-left: 2px solid transparent;
  transition: background var(--dur-fast) linear, border-color var(--dur-fast) linear, color var(--dur-fast) linear;
}
.top-nav .nav-link:hover { background: var(--surface-alt); }
.top-nav .nav-link.active {
  background: var(--primary-soft);
  color: var(--primary);
  border-left-color: var(--primary);
  font-weight: 600;
}
[data-bs-theme="dark"] .top-nav .nav-link.active { color: var(--primary); }

.sidebar-divider { border-color: var(--border); margin: 0.75rem 0; }

.tree-uni-row {
  display: flex; align-items: center; gap: 0.3rem;
  padding: 0.38rem 0.4rem;
  border-radius: var(--radius-sm);
  transition: background var(--dur-fast) linear;
}
.tree-uni-row:hover { background-color: var(--surface-alt); }

.tree-toggle {
  background: none; border: none; padding: 0 0.2rem; line-height: 1;
  color: var(--ink-faint);
}
.tree-caret { transition: transform var(--dur) var(--ease); font-size: 0.62rem; }
.tree-toggle[aria-expanded="true"] .tree-caret { transform: rotate(90deg); }

.tree-uni-link {
  flex-grow: 1; text-decoration: none; color: var(--ink);
  font-size: 0.89rem; font-weight: 500;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.tree-status-badge { font-size: 0.58rem; flex-shrink: 0; }

.tree-children {
  padding-left: 1.55rem;
  border-left: 1px dashed var(--border-strong);
  margin-left: 0.9rem;
  overflow: hidden;
}

.tree-item {
  display: block; font-size: 0.83rem;
  padding: 0.28rem 0.45rem;
  color: var(--ink-muted);
  text-decoration: none;
  border-radius: var(--radius-sm);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  transition: background var(--dur-fast) linear, color var(--dur-fast) linear, padding-left var(--dur) var(--ease);
}
.tree-item:hover { background-color: var(--surface-alt); color: var(--primary); padding-left: 0.65rem; }
.tree-programs-label { font-weight: 600; color: var(--ink-faint) !important; cursor: default; font-size: 0.72rem; }
.tree-programs-label:hover { background: none !important; padding-left: 0.45rem !important; }
.tree-program.text-primary { color: var(--primary) !important; background: var(--primary-soft); }

/* ---------------------------------------------------------------------
   Cards, tables, general surfaces
   --------------------------------------------------------------------- */
.card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
}
.card-header { background: transparent; border-bottom: 1px solid var(--border); font-weight: 600; }

.table-responsive { border-radius: var(--radius); }
.table { color: var(--ink); }
.table thead.table-light th, .table > :not(caption) > * > th {
  background-color: var(--surface-alt);
  color: var(--ink-muted);
  font-weight: 600;
  font-size: 0.82rem;
  border-bottom-color: var(--border);
}
.table > :not(caption) > * > td { border-color: var(--border); vertical-align: middle; }
.table-hover > tbody > tr:hover > * { background-color: var(--surface-alt); }

.list-group-item {
  background: transparent;
  border-color: var(--border);
  color: var(--ink);
  transition: background var(--dur-fast) linear;
}
.list-group-item-action:hover { background-color: var(--surface-alt); }

.nav-tabs { border-bottom-color: var(--border); }
.nav-tabs .nav-link {
  color: var(--ink-muted);
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  font-weight: 500;
  padding: 0.55rem 0.9rem;
  transition: color var(--dur-fast) linear, border-color var(--dur) var(--ease);
}
.nav-tabs .nav-link:hover { color: var(--primary); border-color: var(--border-strong); }
.nav-tabs .nav-link.active {
  color: var(--primary);
  background: transparent;
  border-bottom-color: var(--primary);
  font-weight: 600;
}

.breadcrumb { --bs-breadcrumb-divider: '›'; }
.breadcrumb-item a { color: var(--ink-muted); text-decoration: none; }
.breadcrumb-item a:hover { color: var(--primary); }
.breadcrumb-item.active { color: var(--ink); }

/* ---------------------------------------------------------------------
   Buttons
   --------------------------------------------------------------------- */
.btn { border-radius: var(--radius-sm); font-weight: 500; transition: transform var(--dur-fast) var(--ease), box-shadow var(--dur) var(--ease), background var(--dur-fast) linear, border-color var(--dur-fast) linear; }
.btn:active { transform: translateY(0); }
.btn-primary { background-color: var(--primary); border-color: var(--primary); }
.btn-primary:hover { background-color: var(--primary-dark); border-color: var(--primary-dark); box-shadow: var(--shadow-2); transform: translateY(-1px); }
.btn-outline-secondary { color: var(--ink-muted); border-color: var(--border-strong); }
.btn-outline-secondary:hover { background-color: var(--surface-alt); color: var(--ink); border-color: var(--border-strong); transform: translateY(-1px); }
.btn-outline-primary { color: var(--primary); border-color: var(--primary); }
.btn-outline-primary:hover { background-color: var(--primary); transform: translateY(-1px); }
.btn-outline-danger:hover, .btn-outline-warning:hover, .btn-outline-success:hover { transform: translateY(-1px); }
.btn-sm { border-radius: var(--radius-sm); }

/* ---------------------------------------------------------------------
   Badges
   --------------------------------------------------------------------- */
.badge { font-weight: 600; letter-spacing: 0.01em; }
.text-bg-primary { background-color: var(--primary) !important; }
.text-bg-secondary { background-color: var(--ink-faint) !important; }
.text-bg-success { background-color: var(--success) !important; color: #fff !important; }
.text-bg-danger { background-color: var(--danger) !important; color: #fff !important; }
.text-bg-warning { background-color: var(--warning) !important; color: #fff !important; }
.text-bg-info { background-color: var(--info) !important; color: #fff !important; }
.text-bg-dark { background-color: var(--ink) !important; }
[data-bs-theme="dark"] .text-bg-dark { background-color: var(--ink-faint) !important; color: var(--bg) !important; }
.bg-success-subtle { background-color: var(--success-soft) !important; }
.bg-danger-subtle { background-color: var(--danger-soft) !important; }
.bg-warning-subtle { background-color: var(--warning-soft) !important; }
.bg-info-subtle { background-color: var(--info-soft) !important; }
.bg-primary-subtle { background-color: var(--primary-soft) !important; }
.bg-secondary-subtle { background-color: var(--surface-alt) !important; }

/* ---------------------------------------------------------------------
   Forms
   --------------------------------------------------------------------- */
.form-control, .form-select {
  background-color: var(--surface);
  border-color: var(--border-strong);
  color: var(--ink);
  border-radius: var(--radius-sm);
  transition: border-color var(--dur-fast) linear, box-shadow var(--dur) var(--ease);
}
.form-control:focus, .form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
  background-color: var(--surface);
  color: var(--ink);
}
.form-label { font-weight: 500; color: var(--ink); font-size: 0.87rem; margin-bottom: 0.3rem; }
.form-text { color: var(--ink-faint); }
.badge-select {
  font-weight: 600;
  font-size: 0.8rem;
  border-radius: 999px;
  padding-top: 0.2rem;
  padding-bottom: 0.2rem;
}

/* ---------------------------------------------------------------------
   Modals & toasts
   --------------------------------------------------------------------- */
.modal-content { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-3); }
.modal-header, .modal-footer { border-color: var(--border); }
.modal.fade .modal-dialog { transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease); }

.toast { background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow-2); }

.alert { border-radius: var(--radius); border: 1px solid transparent; animation: dropIn var(--dur-slow) var(--ease); }
.alert-success { background: var(--success-soft); color: var(--success); border-color: var(--success-soft); }
.alert-danger { background: var(--danger-soft); color: var(--danger); border-color: var(--danger-soft); }
.alert-info { background: var(--info-soft); color: var(--info); border-color: var(--info-soft); }
.alert-light { background: var(--surface-alt); color: var(--ink-muted); }

/* ---------------------------------------------------------------------
   Dashboard stat cards — the app's one hero moment
   --------------------------------------------------------------------- */
.stat-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 1.05rem 1.15rem;
  height: 100%;
  position: relative;
  overflow: hidden;
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.stat-card::before {
  content: "";
  position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--primary);
  opacity: 0.55;
}
.stat-card:hover { box-shadow: var(--shadow-2); transform: translateY(-2px); border-color: var(--border-strong); }
.stat-card .stat-value {
  font-family: var(--font-serif);
  font-size: 1.9rem;
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.stat-card .stat-label {
  font-size: 0.74rem;
  color: var(--ink-muted);
  margin-top: 0.3rem;
  font-weight: 500;
}

/* Dashboard hero entrance: staggered, once, on load only */
.stagger-fade-in {
  opacity: 0;
  animation: fadeInUp var(--dur-slow) var(--ease) forwards;
  animation-delay: calc(var(--i, 0) * 55ms);
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes dropIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Urgent deadlines: a slow, deliberate pulse — not decoration, a signal */
.deadline-soon { color: var(--danger); font-weight: 600; position: relative; }
.deadline-week { color: var(--warning); font-weight: 600; }
@media (prefers-reduced-motion: no-preference) {
  .deadline-soon::before {
    content: "";
    display: inline-block;
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--danger);
    margin-right: 5px;
    animation: pulseSoft 2.2s ease-in-out infinite;
  }
}
@keyframes pulseSoft {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(1.4); }
}

/* ---------------------------------------------------------------------
   Misc utility classes used across pages
   --------------------------------------------------------------------- */
.badge-doc-checklist .form-check { padding-left: 0; display: flex; align-items: center; gap: 0.5rem; }
.global-search-form input { border-radius: 2rem; }
.cursor-pointer { cursor: pointer; }
.subtle-link { color: inherit; text-decoration: none; transition: color var(--dur-fast) linear; }
.subtle-link:hover { color: var(--primary); }
.chip-list .badge { margin: 0 0.25rem 0.25rem 0; }

/* ---------------------------------------------------------------------
   Auth pages (login / register / setup)
   --------------------------------------------------------------------- */
.auth-body {
  background: var(--bg);
  min-height: 100vh;
  margin: 0;
  font-family: var(--font-sans);
}
.auth-shell { display: flex; min-height: 100vh; }

.auth-brand-panel {
  flex: 1 1 46%;
  background: linear-gradient(165deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: #EFF3F7;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 3rem 3.2rem;
  position: relative;
  overflow: hidden;
}
.auth-brand-panel::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    repeating-linear-gradient(0deg, rgba(255,255,255,0.05) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(90deg, rgba(255,255,255,0.05) 0 1px, transparent 1px 64px);
  pointer-events: none;
}
.auth-brand-mark { font-size: 1.6rem; position: relative; z-index: 1; }
.auth-brand-headline {
  font-family: var(--font-serif);
  font-size: 2.1rem;
  line-height: 1.25;
  font-weight: 600;
  max-width: 22ch;
  position: relative; z-index: 1;
  margin: 2rem 0 0;
}
.auth-brand-sub {
  color: rgba(239, 243, 247, 0.78);
  font-size: 0.95rem;
  max-width: 34ch;
  margin-top: 1rem;
  position: relative; z-index: 1;
}
.auth-brand-foot {
  font-size: 0.8rem;
  color: rgba(239, 243, 247, 0.6);
  position: relative; z-index: 1;
}

.auth-form-panel {
  flex: 1 1 54%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 1.5rem;
  background: var(--bg);
}
.auth-form-inner {
  width: 100%;
  max-width: 380px;
  animation: fadeInUp var(--dur-slow) var(--ease);
}
.auth-form-inner h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.5rem;
}
.auth-form-inner .btn-primary { width: 100%; padding: 0.6rem; }

@media (max-width: 900px) {
  .auth-brand-panel { display: none; }
  .auth-form-panel { padding: 2rem 1.25rem; }
}

/* ---------------------------------------------------------------------
   Print (leave clean if ever printed)
   --------------------------------------------------------------------- */
@media print {
  .app-sidebar, .app-navbar, .impersonation-banner { display: none !important; }
}