:root {
  --blue-900: #0b2545;
  --blue-700: #13315c;
  --blue-500: #1d5fb8;
  --blue-300: #6fa8ff;
  --ink: #0b2545;
  --muted: #5b6b85;
  --border: rgba(11, 37, 69, 0.12);
  --card-bg: #ffffff;
  --page-bg: #eef3fb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--page-bg);
  color: var(--ink);
}

/* --- Access gates (Login / Passwort / Nutzungsregeln) --- */

.access-gate {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: radial-gradient(circle at 20% 20%, var(--blue-500), var(--blue-900) 65%);
}

.access-card {
  width: 100%;
  max-width: 26rem;
  padding: 2.5rem;
  border-radius: 1.25rem;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  color: #fff;
}

.terms-card {
  max-width: 34rem;
}

.access-kicker {
  margin: 0 0 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.7);
}

.access-card h1 {
  margin: 0 0 1rem;
  font-size: 1.6rem;
}

.auth-hint {
  margin: 0 0 1.25rem;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.75);
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  margin-bottom: 0.35rem;
  color: rgba(255, 255, 255, 0.85);
}

.form-group input {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border-radius: 0.6rem;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  font-size: 0.95rem;
}

.form-group input::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

.access-card button[type="submit"],
.access-card button#terms-accept-button {
  width: 100%;
  padding: 0.75rem;
  border: none;
  border-radius: 0.6rem;
  background: linear-gradient(135deg, var(--blue-300), var(--blue-500));
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  margin-top: 0.25rem;
}

.access-card button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.auth-message {
  margin: 0.9rem 0 0;
  font-size: 0.85rem;
  color: #ffd7d7;
}

.terms-content {
  max-height: 40vh;
  overflow-y: auto;
  padding: 1rem;
  margin-bottom: 1rem;
  border-radius: 0.6rem;
  background: rgba(255, 255, 255, 0.08);
  font-size: 0.85rem;
  line-height: 1.6;
  white-space: pre-wrap;
}

.terms-checkbox {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.85rem;
  margin-bottom: 1rem;
  color: rgba(255, 255, 255, 0.9);
}

/* --- App shell --- */

#app-shell {
  max-width: 60rem;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

header h1 {
  margin: 0 0 0.2rem;
  font-size: 1.4rem;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.user-menu {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.secondary-button,
.link-button {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--ink);
  padding: 0.5rem 0.9rem;
  border-radius: 0.6rem;
  font-size: 0.85rem;
  cursor: pointer;
}

.link-button {
  border: none;
  background: none;
  padding: 0;
  color: var(--blue-500);
  font-weight: 600;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 8px 24px rgba(11, 37, 69, 0.06);
}

.muted {
  color: var(--muted);
  font-size: 0.85rem;
}

.access-denied-card h2 {
  margin-top: 0;
}

.view-nav {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.view-tab {
  border: 1px solid var(--border);
  background: #fff;
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  font-size: 0.85rem;
  cursor: pointer;
  color: var(--muted);
}

.view-tab.active {
  background: var(--blue-500);
  border-color: var(--blue-500);
  color: #fff;
}

/* --- Course picker --- */

.course-picker h2 {
  margin: 0 0 0.25rem;
}

.course-picker-list {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.course-picker-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 1.25rem;
  border-radius: 0.9rem;
  border: 1px solid var(--border);
  background: #fff;
  cursor: pointer;
  font-weight: 600;
}

.course-picker-item:hover {
  border-color: var(--blue-500);
}

/* --- Chat --- */

.chat-panel-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.chat-panel-header h2 {
  margin: 0.15rem 0 0;
}

.chat-messages {
  min-height: 20rem;
  max-height: 55vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  padding: 1.25rem;
  border-radius: 1rem;
  border: 1px solid var(--border);
  background: #fff;
  margin-bottom: 1rem;
}

.chat-message {
  max-width: 85%;
  padding: 0.75rem 1rem;
  border-radius: 0.9rem;
  line-height: 1.5;
  font-size: 0.92rem;
  white-space: pre-wrap;
}

.chat-message.user {
  align-self: flex-end;
  background: var(--blue-500);
  color: #fff;
  border-bottom-right-radius: 0.2rem;
}

.chat-message.assistant {
  align-self: flex-start;
  background: #f1f5fb;
  color: var(--ink);
  border-bottom-left-radius: 0.2rem;
}

.chat-sources {
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.chat-source-chip {
  background: rgba(11, 37, 69, 0.06);
  border-radius: 999px;
  padding: 0.15rem 0.6rem;
}

.chat-actions {
  margin-top: 0.6rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.chat-action-button {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--muted);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  font-size: 0.75rem;
  cursor: pointer;
}

.chat-action-button.active {
  border-color: var(--blue-500);
  color: var(--blue-500);
}

.chat-form {
  display: flex;
  gap: 0.6rem;
}

.chat-form textarea {
  flex: 1;
  resize: vertical;
  padding: 0.7rem 0.9rem;
  border-radius: 0.7rem;
  border: 1px solid var(--border);
  font-family: inherit;
  font-size: 0.92rem;
}

.chat-form button {
  align-self: flex-end;
  padding: 0.7rem 1.3rem;
  border: none;
  border-radius: 0.7rem;
  background: var(--blue-500);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}

.chat-form button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* --- Admin lists / forms (shared) --- */

.archive-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.archive-header h2 {
  margin: 0 0 0.2rem;
}

.archive-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.archive-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1rem;
  border-radius: 0.7rem;
  border: 1px solid var(--border);
  flex-wrap: wrap;
}

.archive-row-main {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.archive-row-title {
  font-weight: 600;
}

.status-pill {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.status-pill.done { background: #e3f6e8; color: #1c7c3c; }
.status-pill.processing { background: #fff6da; color: #9a7300; }
.status-pill.pending { background: #eef1f6; color: var(--muted); }
.status-pill.failed { background: #fde7e7; color: #b3261e; }

.course-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.course-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.2rem 0.65rem;
  font-size: 0.78rem;
  cursor: pointer;
  background: #fff;
}

.course-tag.assigned {
  background: var(--blue-500);
  border-color: var(--blue-500);
  color: #fff;
}

.invite-form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: 0.9rem;
  align-items: end;
}

.invite-form label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.invite-form input,
.invite-form select {
  padding: 0.6rem 0.75rem;
  border-radius: 0.6rem;
  border: 1px solid var(--border);
  font-size: 0.9rem;
  font-family: inherit;
}

.invite-form button {
  padding: 0.65rem 1.1rem;
  border: none;
  border-radius: 0.6rem;
  background: var(--blue-500);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  height: fit-content;
}

[hidden] {
  display: none !important;
}

/* --- Admin Verwaltung: Ergaenzungen, die im Lern-Assistenten-Original
   fehlen (kein Login-Tab-Umschalter, keine Fehlerfarbe, keine
   Rollen-Pille) --- */

.auth-tabs {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.auth-tab {
  flex: 1;
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.8rem;
  font-family: inherit;
  cursor: pointer;
}

.auth-tab.active {
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.4);
  color: #fff;
}

.error {
  color: #b3261e;
  font-size: 0.85rem;
}

.admin-invite-card > div {
  margin-bottom: 1rem;
}

.admin-invite-card h2,
.archive-row-title {
  margin: 0 0 0.2rem;
}

.role-hint {
  display: block;
  font-size: 0.72rem;
  color: var(--muted);
  margin-top: 0.15rem;
}

.role-pill {
  display: inline-block;
  width: fit-content;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(29, 95, 184, 0.12);
  color: var(--blue-500);
}

.role-pill.inactive {
  background: #fde7e7;
  color: #b3261e;
}

.archive-empty {
  color: var(--muted);
  font-size: 0.9rem;
  padding: 0.5rem 0;
}

.user-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

#usage-month {
  padding: 0.45rem 0.6rem;
  border-radius: 0.6rem;
  border: 1px solid var(--border);
  font-size: 0.85rem;
  font-family: inherit;
}

.user-actions select {
  padding: 0.45rem 0.6rem;
  border-radius: 0.6rem;
  border: 1px solid var(--border);
  font-size: 0.85rem;
  font-family: inherit;
}

button.is-loading {
  opacity: 0.7;
  cursor: wait;
}

.documents-search {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border-radius: 0.6rem;
  border: 1px solid var(--border);
  font-size: 0.9rem;
  font-family: inherit;
  margin-bottom: 1rem;
}

.doc-course-group {
  margin-bottom: 1.25rem;
}

.doc-course-group:last-child {
  margin-bottom: 0;
}

.doc-course-title {
  font-size: 1rem;
  margin: 0 0 0.6rem;
  cursor: pointer;
}

.doc-course-title::marker {
  color: var(--blue-500);
}

.doc-week-group {
  margin: 0 0 0.5rem 1.1rem;
}

.doc-week-group:last-child {
  margin-bottom: 0;
}

.doc-week-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin: 0 0 0.4rem;
  cursor: pointer;
}

.doc-week-group[open] > .doc-week-title {
  margin-bottom: 0.4rem;
}

.doc-week-group .archive-list {
  gap: 0.4rem;
  margin-top: 0.4rem;
}

.app-footer {
  box-sizing: border-box;
  margin: 0.75rem auto 2rem;
  max-width: 60rem;
  padding: 0 1.5rem;
  text-align: center;
}

.app-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.1rem;
  justify-content: center;
}

.app-footer a {
  color: var(--muted);
  font-size: 0.82rem;
  text-decoration: none;
}

.app-footer a:hover {
  color: var(--blue-500);
  text-decoration: underline;
}

.preview-modal {
  position: fixed;
  inset: 0;
  background: rgba(11, 37, 69, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  z-index: 1000;
}

.preview-modal-inner {
  background: var(--card-bg);
  border-radius: 1rem;
  width: min(56rem, 100%);
  height: min(85vh, 100%);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(11, 37, 69, 0.35);
}

.preview-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.preview-modal-header h3 {
  margin: 0;
  font-size: 0.95rem;
  overflow-wrap: anywhere;
}

.preview-modal-body {
  flex: 1;
  overflow: auto;
  padding: 0;
}

.preview-modal-body iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

.preview-modal-body .preview-docx {
  padding: 1.5rem 2rem;
  line-height: 1.6;
  color: var(--ink);
}

.preview-modal-body .preview-docx img {
  max-width: 100%;
}

.preview-modal-body .preview-status {
  padding: 2rem;
  color: var(--muted);
  text-align: center;
}