/* === Reset + Base (mobile-first) === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Brand — calm blue */
  --color-primary: #0C447C;
  --color-primary-hover: #185FA5;
  --color-surface-info: #E6F1FB;
  --color-surface-info-text: #042C53;
  --color-surface-info-secondary: #185FA5;
  /* Semantic */
  --color-danger: #dc2626;
  --color-danger-hover: #b91c1c;
  --color-success: #16a34a;
  --color-warning: #d97706;
  --color-pending: #6b7280;
  /* Surfaces */
  --color-bg: #f5f7fa;
  --color-card: #ffffff;
  --color-border: #dde3ea;
  /* Text */
  --color-text: #1e293b;
  --color-text-light: #64748b;
  /* Shape */
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: none;
  --shadow-modal: 0 4px 16px rgba(12, 68, 124, 0.08);
}

html { font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-weight: 400;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

/* === Navigation (deep navy) === */
.nav {
  background: var(--color-primary);
  padding: 0.75rem 1rem;
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  max-width: 1200px;
  margin: 0 auto;
}
.nav-brand {
  font-weight: 500;
  font-size: 1.1rem;
  color: #ffffff;
  text-decoration: none;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.nav-links a { color: rgba(255,255,255,0.85); text-decoration: none; font-size: 0.9rem; }
.nav-links a:hover { color: #ffffff; }
.nav-logout { display: inline; }

/* === Container === */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

/* === Typography === */
h1 { font-size: 1.5rem; margin-bottom: 1rem; }
h2 { font-size: 1.2rem; margin-bottom: 0.75rem; color: var(--color-text); }

/* === Auth pages === */
.auth-page {
  max-width: 400px;
  margin: 3rem auto;
  text-align: center;
}
.auth-subtitle { color: var(--color-text-light); margin-bottom: 1.5rem; }

/* === Alerts === */
.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  font-size: 0.9rem;
}
.alert-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: #166534; border: 1px solid #bbf7d0; }
.alert-warning { background: #fffbeb; color: #92400e; border: 1px solid #fcd34d; }

/* === Forms === */
.form { text-align: left; }
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-weight: 500; margin-bottom: 0.25rem; font-size: 0.9rem; }
.form-group small { color: var(--color-text-light); font-size: 0.8rem; }
.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group input[type="password"] {
  width: 100%;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem;
  transition: border-color 0.15s;
}
.form-group input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}
fieldset { border: none; }
legend { font-weight: 500; margin-bottom: 0.5rem; font-size: 0.9rem; }
.checkbox-group { display: flex; flex-direction: column; gap: 0.5rem; }
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.95rem;
}
.checkbox-label input { width: 1.1rem; height: 1.1rem; }

/* === Buttons === */
.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  background: var(--color-card);
  color: var(--color-text);
  transition: all 0.15s;
  line-height: 1.4;
}
.btn:hover { background: var(--color-bg); }
.btn-primary { background: var(--color-primary); color: white; border-color: var(--color-primary); }
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-secondary { background: var(--color-card); }
.btn-danger { background: var(--color-danger); color: white; border-color: var(--color-danger); }
.btn-danger:hover { background: var(--color-danger-hover); }
.btn-full { width: 100%; }
.btn-sm { padding: 0.3rem 0.6rem; font-size: 0.8rem; }
.btn-link {
  background: none;
  border: none;
  color: rgba(255,255,255,0.7);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0;
  text-decoration: underline;
}
.btn-link:hover { color: #ffffff; }

/* === Page header === */
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.page-header h1 { margin-bottom: 0; }

/* === Tables === */
.table-wrapper { overflow-x: auto; }
.table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.table th, .table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}
.table th { font-weight: 600; font-size: 0.85rem; color: var(--color-text-light); text-transform: uppercase; letter-spacing: 0.03em; }
.table td { font-size: 0.9rem; }
.table a { color: var(--color-primary); text-decoration: none; }
.table a:hover { text-decoration: underline; }

/* === Badges === */
.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}
.badge-success { background: #dcfce7; color: var(--color-success); }
.badge-warning { background: #fef3c7; color: var(--color-warning); }
.badge-info { background: var(--color-surface-info); color: var(--color-primary); }
.badge-pending { background: #f1f5f9; color: var(--color-pending); }

/* === Cards / Details === */
.detail-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1rem;
}
.detail-list { display: grid; grid-template-columns: auto 1fr; gap: 0.4rem 1rem; }
.detail-list dt { font-weight: 500; color: var(--color-text-light); font-size: 0.85rem; }
.detail-list dd { font-size: 0.95rem; }
.detail-grid { display: flex; flex-direction: column; gap: 1rem; }

/* === Invite URL === */
.invite-url-group { margin: 1rem 0; }
.copy-group { display: flex; gap: 0.5rem; margin-top: 0.25rem; }
.copy-input {
  flex: 1;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.8rem;
  background: var(--color-bg);
}
.copy-feedback { color: var(--color-success); font-weight: 500; }
.invite-actions { display: flex; gap: 0.5rem; margin-top: 0.75rem; }
.inline-form { display: inline; }

/* === Category list === */
.category-list { list-style: none; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.category-list li {
  background: var(--color-surface-info);
  color: var(--color-primary);
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
}

/* === Search === */
.search-form { margin-bottom: 1rem; }
.search-group { display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; }
.search-input {
  flex: 1;
  min-width: 200px;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.9rem;
}
.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* === Status dots (overview table) === */
.status-dots { display: flex; gap: 4px; flex-wrap: wrap; }
.status-dot {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 4px;
  font-size: 0.65rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s;
}
.status-dot:focus { outline: 2px solid var(--color-primary); outline-offset: 1px; }
.dot-pending { background: #E5E7EB; color: #6b7280; }
.dot-ok { background: var(--color-primary); color: #ffffff; }
.dot-booked { background: var(--color-primary-hover); color: #ffffff; }

/* === Status field grid (detail page) === */
.status-grid { display: grid; grid-template-columns: 1fr; gap: 0.75rem; }
.status-field label { display: block; font-weight: 500; font-size: 0.85rem; color: var(--color-text-light); margin-bottom: 0.3rem; }
.status-buttons { display: flex; gap: 4px; flex-wrap: wrap; }
.status-btn {
  padding: 0.3rem 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-card);
  color: var(--color-text);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s;
}
.status-btn:hover { background: var(--color-bg); }
.status-btn.status-active { background: var(--color-primary); color: white; border-color: var(--color-primary); }
.status-btn.status-active.status-done { background: var(--color-success); border-color: var(--color-success); }

/* === Subcategory buttons === */
.subcat-buttons { display: flex; gap: 4px; flex-wrap: wrap; }
.subcat-btn {
  padding: 0.3rem 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-card);
  color: var(--color-text);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s;
}
.subcat-btn:hover { background: var(--color-bg); }
.subcat-btn.subcat-active { background: var(--color-primary); color: white; border-color: var(--color-primary); }

/* === Note warning === */
.note-warning {
  background: #fffbeb;
  border: 1px solid #fcd34d;
  border-radius: var(--radius);
  padding: 0.6rem 0.85rem;
  margin-bottom: 0.75rem;
  font-size: 0.85rem;
  color: #92400e;
}

/* === Textarea === */
.form-textarea {
  width: 100%;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-family: inherit;
  line-height: 1.5;
  resize: vertical;
  transition: border-color 0.15s;
}
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* === Save feedback === */
.save-feedback {
  font-size: 0.8rem;
  margin-left: 0.5rem;
  color: var(--color-success);
  font-weight: 500;
}
.status-feedback {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-success);
  margin-top: 0.25rem;
}
.status-feedback-error {
  color: var(--color-danger);
}

/* === Action buttons === */
.action-buttons { display: flex; gap: 0.75rem; flex-wrap: wrap; }

/* === Modal === */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}
.modal-content {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  max-width: 450px;
  width: 90%;
  box-shadow: var(--shadow-modal);
}
.modal-content h3 { margin-bottom: 0.75rem; }
.modal-content p { margin-bottom: 0.75rem; font-size: 0.9rem; }
.modal-actions { display: flex; gap: 0.5rem; margin-top: 1rem; }

/* === Checkbox inline === */
.checkbox-inline { flex-direction: row; flex-wrap: wrap; }

/* === Privacy link === */
.privacy-link { margin-top: 1rem; font-size: 0.85rem; color: var(--color-text-light); }
.privacy-link a { color: var(--color-primary); }
.privacy-page .detail-card { margin-bottom: 1rem; }
.privacy-page ul { margin-left: 1.2rem; margin-top: 0.25rem; }
.privacy-page li { margin-bottom: 0.25rem; font-size: 0.9rem; }

/* === Filter bar === */
.filter-bar { margin-bottom: 1rem; }
.filter-form { display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; }
.filter-select {
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.85rem;
  background: var(--color-card);
}
.filter-checkbox { font-size: 0.85rem; }
.form-select {
  width: 100%;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem;
  background: var(--color-card);
}
.form-row { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.form-row .form-group { flex: 1; min-width: 120px; }

/* === Availability per-day rows (student) === */
.avail-day {
  margin-bottom: 1rem;
}
.avail-day-header {
  font-weight: 600;
  font-size: 0.9rem;
  text-transform: capitalize;
  color: var(--color-text-light);
  margin-bottom: 0.4rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--color-border);
}
.avail-day-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0.25rem 0;
}

/* Slot button (time-labeled) */
.avail-btn-slot {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 56px;
  min-height: 44px;
  padding: 0.4rem 0.75rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-card);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  color: var(--color-text);
}
.avail-btn-slot:hover { background: var(--color-bg); border-color: var(--color-primary); }
.avail-btn-slot:focus { outline: 2px solid var(--color-primary); outline-offset: 2px; }

/* Active (Kan) state */
.avail-btn-slot.avail-btn-on {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}
.avail-btn-slot.avail-btn-on:hover { background: var(--color-primary-hover); }

/* "Alle" button variant */
.avail-btn-alle {
  background: var(--color-surface-info);
  border-color: #bfdbfe;
  color: var(--color-primary);
  font-size: 0.8rem;
}
.avail-btn-alle:hover { background: #dbeafe; }

/* Feedback tooltip (absolutely positioned, no layout shift) */
.avail-feedback-tip {
  position: absolute;
  z-index: 300;
  background: var(--color-primary);
  color: white;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius);
  font-size: 0.75rem;
  font-weight: 600;
  pointer-events: none;
  white-space: nowrap;
  animation: avail-fade 1.5s ease-out forwards;
}
.avail-feedback-error { background: var(--color-danger); }

@keyframes avail-fade {
  0% { opacity: 1; transform: translateY(0); }
  70% { opacity: 1; transform: translateY(-2px); }
  100% { opacity: 0; transform: translateY(-6px); }
}

.avail-info-banner {
  background: var(--color-surface-info);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius);
  padding: 0.6rem 0.85rem;
  margin-bottom: 1rem;
  font-size: 0.85rem;
  color: var(--color-surface-info-text);
}


/* === Availability overview (admin) === */
.avail-card { margin-bottom: 1rem; }
.avail-header { display: flex; justify-content: space-between; align-items: center; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 0.5rem; }
.avail-time { color: var(--color-text-light); font-size: 0.9rem; margin-left: 0.5rem; }
.avail-badges { display: flex; gap: 0.25rem; }
.avail-meta { font-size: 0.85rem; color: var(--color-text-light); margin-bottom: 0.75rem; display: flex; gap: 0.5rem; align-items: center; }
.avail-lists { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 0.75rem; }
.avail-lists-2col { grid-template-columns: 1fr 1fr; }
.avail-col h4 { font-size: 0.8rem; color: var(--color-text-light); text-transform: uppercase; letter-spacing: 0.03em; margin-bottom: 0.25rem; }
.avail-col ul { list-style: none; font-size: 0.85rem; }
.avail-col ul li { padding: 0.15rem 0; }
.avail-col a { color: var(--color-primary); text-decoration: none; }
.avail-col a:hover { text-decoration: underline; }
.avail-can h4 { color: var(--color-success); }
.avail-cannot h4 { color: var(--color-danger); }
.avail-empty { color: var(--color-text-light); font-size: 0.8rem; font-style: italic; }

/* Admin availability per-day table */
.avail-day-table th { font-size: 0.75rem; }
.avail-day-table td { font-size: 0.85rem; padding: 0.4rem 0.5rem; }
.avail-cell-kan {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 24px;
  background: var(--color-primary);
  color: white;
  border-radius: 4px;
  font-size: 0.75rem;
  text-decoration: none;
}
.avail-cell-kan:hover { background: var(--color-primary-hover); }
.avail-cell-empty {
  display: inline-block;
  width: 28px;
  height: 24px;
  background: var(--color-bg);
  border-radius: 4px;
}

/* === Slot kind label (student view) === */
.slot-kind-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: 0.25rem;
}
.slot-kind-info {
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-top: 0.15rem;
}
.slot-kind-group {
  margin-bottom: 0.75rem;
}

/* === Install banner === */
.install-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-surface-info);
  color: var(--color-surface-info-text);
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  z-index: 200;
  border-top: 1px solid #bfdbfe;
}
.install-banner-close {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--color-text-light);
  padding: 0 4px;
  margin-left: 8px;
}

/* === Hero section === */
.hero-section {
  background: var(--color-surface-info);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
}
.hero-section h1 {
  color: var(--color-surface-info-text);
  font-size: 1.3rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
}
.hero-section p {
  color: var(--color-surface-info-secondary);
  font-size: 0.9rem;
  margin: 0;
}

/* === Misc === */
.empty-state { color: var(--color-text-light); text-align: center; padding: 3rem 1rem; }
.empty-state a { color: var(--color-primary); }
.back-link { margin-top: 1.5rem; }
.back-link a { color: var(--color-text-light); text-decoration: none; }
.back-link a:hover { color: var(--color-primary); }
.info-text { color: var(--color-text-light); font-style: italic; margin-top: 1.5rem; font-size: 0.9rem; }
.mobile-only { display: block; font-size: 0.8rem; color: var(--color-text-light); }
.category-badge { margin-top: 0.2rem; }

/* === Mobile: hide desktop-only columns === */
.hide-mobile { display: none; }

/* === Tablet (768px+) === */
@media (min-width: 768px) {
  .container { padding: 2rem 1.5rem; }
  h1 { font-size: 1.75rem; }
  .auth-page { margin-top: 4rem; }
  .hide-mobile { display: table-cell; }
  .mobile-only { display: none; }
  .detail-grid { flex-direction: row; }
  .detail-grid > * { flex: 1; }
  .status-grid { grid-template-columns: 1fr 1fr; }
}

/* === Mobile: stack availability lists === */
@media (max-width: 767px) {
  .avail-lists { grid-template-columns: 1fr; }
}

/* === Desktop (1024px+) === */
@media (min-width: 1024px) {
  .container { padding: 2rem; }
  h1 { font-size: 2rem; }
  .nav-inner { padding: 0; }
  .nav-links { gap: 1.25rem; }
  .table th, .table td { padding: 0.875rem 1.25rem; }
  .status-grid { grid-template-columns: 1fr 1fr 1fr; }
}