/* ═══════════════════════════════════════════════════
   ComentaIA — Style System
   Font: Outfit (display) + JetBrains Mono (code)
   Palette: Deep ink + Coral accent + Sage
═══════════════════════════════════════════════════ */

:root {
  --ink: #0f0f1a;
  --ink-80: #1e1e32;
  --ink-60: #3d3d58;
  --ink-40: #7c7c9a;
  --ink-20: #c5c5d8;
  --ink-10: #e8e8f0;
  --ink-05: #f4f4f8;

  --accent: #ff5f6d;
  --accent-dark: #e04050;
  --accent-light: #fff0f1;

  --teal: #00b4a0;
  --teal-light: #e0faf8;
  --purple: #7c3aed;
  --purple-light: #f5f0ff;
  --amber: #f59e0b;

  --white: #ffffff;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 20px rgba(15,15,26,0.08);
  --shadow-md: 0 8px 32px rgba(15,15,26,0.12);
  --shadow-lg: 0 16px 48px rgba(15,15,26,0.18);

  --sidebar-w: 220px;
  --font: 'Outfit', system-ui, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font);
  background: var(--ink-05);
  color: var(--ink);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ─── SCROLLBAR ─── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--ink-20); border-radius: 99px; }

/* ══════════════════════════════════════
   LOGIN
══════════════════════════════════════ */
#loginScreen {
  background: linear-gradient(135deg, var(--ink) 0%, #1a1a3e 50%, #0f2027 100%);
  position: relative;
  overflow: hidden;
}

#loginScreen::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255,95,109,0.15) 0%, transparent 70%);
  border-radius: 50%;
}
#loginScreen::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0,180,160,0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.login-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  backdrop-filter: blur(20px);
  border-radius: 24px;
  padding: 48px 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255,255,255,0.05);
  position: relative;
  z-index: 1;
  animation: slideUp 0.5s ease;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.login-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.logo-icon {
  font-size: 48px;
  filter: drop-shadow(0 4px 12px rgba(255,95,109,0.4));
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.login-title {
  color: #fff;
  font-size: 32px;
  font-weight: 800;
  text-align: center;
  letter-spacing: -0.5px;
  margin-bottom: 8px;
}

.login-sub {
  color: rgba(255,255,255,0.5);
  font-size: 14px;
  text-align: center;
  margin-bottom: 32px;
  line-height: 1.5;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.login-input {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-sm);
  color: #fff;
  padding: 14px 16px;
  font-size: 14px;
  font-family: var(--font);
  transition: all 0.2s;
  outline: none;
}

.login-input::placeholder { color: rgba(255,255,255,0.35); }
.login-input:focus {
  border-color: var(--accent);
  background: rgba(255,255,255,0.1);
  box-shadow: 0 0 0 3px rgba(255,95,109,0.15);
}

/* ── Camps amb icona ── */
.field-wrap {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%; /* ← això soluciona l'encongiment */
}

.field-icon {
  position: absolute;
  left: 14px;
  font-size: 15px;
  line-height: 1;
  pointer-events: none;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  color: rgba(255,255,255,0.5); /* ← color blanc semitransparent per al sobre */
  filter: none; /* ← treure el filter anterior */
}

.field-wrap .login-input {
  width: 100%; /* ← també aquí */
  padding-left: 44px;
}

.login-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  color: rgba(255,255,255,0.3);
  font-size: 12px;
}
.login-divider::before,
.login-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: rgba(255,255,255,0.1);
}

/* ══════════════════════════════════════
   BUTTONS
══════════════════════════════════════ */
.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 13px 20px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  white-space: nowrap;
}
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(255,95,109,0.35); }
.btn-primary:active { transform: translateY(0); }

.btn-google {
  background: rgba(255,255,255,0.1);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-sm);
  padding: 13px 20px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.btn-google:hover { background: rgba(255,255,255,0.15); }

.btn-secondary {
  background: var(--ink-05);
  color: var(--ink-60);
  border: 1px solid var(--ink-20);
  border-radius: var(--radius-sm);
  padding: 11px 20px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  white-space: nowrap;
}
.btn-secondary:hover { background: var(--ink-10); }

.btn-link {
  background: transparent;
  color: rgba(255,255,255,0.5);
  border: none;
  font-family: var(--font);
  font-size: 13px;
  cursor: pointer;
  text-decoration: underline;
  transition: color 0.2s;
  padding: 8px;
}
.btn-link:hover { color: rgba(255,255,255,0.8); }

.btn-outline {
  background: transparent;
  color: var(--ink-60);
  border: 1px solid var(--ink-20);
  border-radius: var(--radius-sm);
  padding: 9px 16px;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}
.btn-outline:hover { background: var(--ink-05); border-color: var(--ink-40); color: var(--ink); }

.btn-danger-outline {
  background: transparent;
  color: #ef4444;
  border: 1px solid #fca5a5;
  border-radius: var(--radius-sm);
  padding: 9px 14px;
  font-family: var(--font);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-danger-outline:hover { background: #fef2f2; }

.btn-danger {
  background: #ef4444;
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 11px 20px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-danger:hover { background: #dc2626; }

.btn-icon {
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: 6px;
  font-size: 16px;
  line-height: 1;
  transition: background 0.15s;
  color: inherit;
}
.btn-icon:hover { background: var(--ink-10); }

.btn-sm { padding: 7px 12px; font-size: 13px; }
.btn-tutoria {
  background: linear-gradient(135deg, #7c3aed, #a855f7);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 9px 14px;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}
.btn-tutoria:hover { opacity: 0.9; transform: translateY(-1px); }

.w-full { width: 100%; }

/* ══════════════════════════════════════
   APP LAYOUT
══════════════════════════════════════ */
#appRoot {
  display: flex;
  min-height: 100vh;
}

/* ── SIDEBAR ── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--ink);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 200;
  transition: transform 0.3s ease;
}

.sidebar-header {
  padding: 24px 20px 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.07);
}

.sidebar-logo { font-size: 24px; }
.sidebar-title {
  color: #fff;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.3px;
}

.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(255,255,255,0.5);
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  padding: 11px 12px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  text-align: left;
  width: 100%;
}
.nav-item:hover { background: rgba(255,255,255,0.06); color: rgba(255,255,255,0.8); }
.nav-item.active { background: rgba(255,95,109,0.15); color: #fff; }

.nav-icon { font-size: 18px; }

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid rgba(255,255,255,0.07);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.user-email {
  color: rgba(255,255,255,0.6);
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.user-actions {
  display: flex;
  gap: 4px;
}

.user-actions .btn-icon {
  color: rgba(255,255,255,0.4);
  flex: 1;
  text-align: center;
  font-size: 18px;
}
.user-actions .btn-icon:hover { color: rgba(255,255,255,0.8); background: rgba(255,255,255,0.07); }

/* ── MAIN CONTENT ── */
.main-content {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── MOBILE HEADER ── */
.mobile-header {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--white);
  border-bottom: 1px solid var(--ink-10);
  position: sticky;
  top: 0;
  z-index: 100;
}

.mobile-logo {
  font-size: 16px;
  font-weight: 800;
  color: var(--ink);
}

/* ── APP SCREENS ── */
.app-screen {
  padding: 28px 32px;
  flex: 1;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ── SCREEN HEADER ── */
.screen-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 28px;
  gap: 16px;
  flex-wrap: wrap;
}

.screen-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.5px;
  line-height: 1.1;
}

.screen-sub {
  color: var(--ink-40);
  font-size: 14px;
  margin-top: 4px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* ══════════════════════════════════════
   CLASSES GRID
══════════════════════════════════════ */
.classes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.class-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid var(--ink-10);
  position: relative;
  overflow: visible;
}

.class-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  border-radius: var(--radius) var(--radius) 0 0;
}

.class-card:nth-child(6n+1)::before { background: linear-gradient(90deg, #ff5f6d, #ff8f9d); }
.class-card:nth-child(6n+2)::before { background: linear-gradient(90deg, #00b4a0, #5ee7d0); }
.class-card:nth-child(6n+3)::before { background: linear-gradient(90deg, #7c3aed, #a78bfa); }
.class-card:nth-child(6n+4)::before { background: linear-gradient(90deg, #f59e0b, #fcd34d); }
.class-card:nth-child(6n+5)::before { background: linear-gradient(90deg, #3b82f6, #93c5fd); }
.class-card:nth-child(6n+6)::before { background: linear-gradient(90deg, #ec4899, #f9a8d4); }

.class-card:hover {
  border-color: var(--ink-20);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.class-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
  margin-right: 28px;
}

.class-card-meta {
  font-size: 13px;
  color: var(--ink-40);
  display: flex;
  align-items: center;
  gap: 12px;
}

.meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--ink-05);
  border-radius: 99px;
  padding: 3px 10px;
  font-size: 12px;
  color: var(--ink-60);
}

.class-card-menu {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 10;
}

.class-card .card-menu-dropdown {
  position: absolute;
  right: 0;
  top: calc(100% + 4px);
  background: var(--white);
  border: 1px solid var(--ink-10);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  min-width: 140px;
  width: max-content;
  z-index: 200;
  overflow: hidden;
}

.card-menu-dropdown button {
  display: block;
  width: 100%;
  text-align: left;
  padding: 9px 14px;
  font-size: 13px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--ink-60);
  font-family: var(--font);
  transition: background 0.1s;
}
.card-menu-dropdown button:hover { background: var(--ink-05); color: var(--ink); }

/* ══════════════════════════════════════
   CLASS VIEW
══════════════════════════════════════ */
.class-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 20px;
  gap: 16px;
  flex-wrap: wrap;
}

.class-header-left {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.btn-back {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--ink-40);
  font-size: 14px;
  padding: 4px 8px;
  border-radius: 6px;
  transition: all 0.15s;
  font-family: var(--font);
  white-space: nowrap;
  margin-top: 4px;
}
.btn-back:hover { color: var(--ink); background: var(--ink-05); }

.class-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--ink);
}

.class-sub {
  font-size: 12px;
  color: var(--ink-40);
  margin-top: 2px;
}

.class-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* CLASS BODY */
.class-body {
  display: flex;
  gap: 16px;
  height: calc(100vh - 200px);
  min-height: 500px;
}

/* ── STUDENTS PANEL ── */
.students-panel {
  width: 300px;
  flex-shrink: 0;
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--ink-10);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.students-panel-inner {
  padding: 16px;
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  position: relative;
}

.close-mobile-btn {
  display: none;
  position: absolute;
  top: 8px;
  right: 8px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 18px;
  color: var(--ink-40);
  padding: 4px 8px;
}

.students-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.students-panel-header h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 6px;
}

.count-badge {
  background: var(--ink-10);
  color: var(--ink-60);
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 99px;
}

.search-input {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--ink-10);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-family: var(--font);
  background: var(--ink-05);
  color: var(--ink);
  outline: none;
  transition: all 0.2s;
  margin-bottom: 10px;
}
.search-input:focus {
  border-color: var(--accent);
  background: var(--white);
  box-shadow: 0 0 0 3px rgba(255,95,109,0.1);
}

.students-list {
  list-style: none;
  overflow-y: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.student-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s;
  position: relative;
  gap: 6px;
}

.student-item:hover { background: var(--ink-05); }
.student-item.active { background: var(--accent-light); }
.student-item.active .student-name { color: var(--accent-dark); font-weight: 600; }

.student-name {
  font-size: 13px;
  color: var(--ink);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.student-comment-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--teal);
  flex-shrink: 0;
}

.student-item-actions {
  display: flex;
  gap: 2px;
  opacity: 0;
  transition: opacity 0.15s;
}
.student-item:hover .student-item-actions { opacity: 1; }

.student-item-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 3px 5px;
  border-radius: 4px;
  font-size: 12px;
  color: var(--ink-40);
  transition: all 0.1s;
}
.student-item-btn:hover { background: var(--ink-10); color: var(--ink); }
.student-item-btn.delete:hover { background: #fee2e2; color: #ef4444; }

.drag-hint {
  font-size: 11px;
  color: var(--ink-20);
  text-align: center;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--ink-05);
}

/* ── COMMENTS PANEL ── */
.comments-panel {
  flex: 1;
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--ink-10);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.comments-empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--ink-40);
  text-align: center;
  padding: 40px;
}

.empty-icon {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.comments-empty-state h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink-40);
  margin-bottom: 8px;
}

.comments-empty-state p {
  font-size: 14px;
  color: var(--ink-20);
}

.comments-grid {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}

/* Student comment card in grid */
.comment-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px;
  border: 1px solid var(--ink-10);
  border-radius: var(--radius);
  margin-bottom: 12px;
  transition: all 0.2s;
  background: var(--ink-05);
}
.comment-card:hover {
  border-color: var(--ink-20);
  background: var(--white);
}

.comment-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.comment-card-name {
  font-weight: 700;
  font-size: 15px;
  color: var(--ink);
}

.comment-card-actions {
  display: flex;
  gap: 6px;
}

.comment-text {
  font-size: 14px;
  color: var(--ink-60);
  line-height: 1.6;
  background: var(--white);
  border: 1px solid var(--ink-10);
  border-radius: var(--radius-sm);
  padding: 12px;
  min-height: 60px;
  white-space: pre-wrap;
}

.comment-text.empty {
  color: var(--ink-20);
  font-style: italic;
}

/* ══════════════════════════════════════
   MODALS
══════════════════════════════════════ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15,15,26,0.5);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  animation: fadeIn 0.15s ease;
}

.modal-overlay:not(.hidden) { display: flex; }

.modal-box {
  background: var(--white);
  border-radius: var(--radius);
  padding: 28px;
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.2s ease;
}

.modal-lg { max-width: 560px; }
.modal-sm { max-width: 360px; }

.modal-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 20px;
}

.modal-input {
  width: 100%;
  border: 1px solid var(--ink-20);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 14px;
  font-family: var(--font);
  color: var(--ink);
  outline: none;
  transition: all 0.2s;
  margin-bottom: 16px;
}
.modal-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(255,95,109,0.1);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.file-input {
  width: 100%;
  margin-bottom: 16px;
  font-size: 13px;
  color: var(--ink-60);
}

.import-instructions {
  background: var(--ink-05);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-size: 13px;
  color: var(--ink-60);
  margin-bottom: 16px;
  line-height: 1.7;
}

.import-instructions ul {
  margin-top: 6px;
  margin-left: 16px;
}

.comment-textarea {
  width: 100%;
  border: 1px solid var(--ink-20);
  border-radius: var(--radius-sm);
  padding: 14px;
  font-size: 14px;
  font-family: var(--font);
  color: var(--ink);
  outline: none;
  resize: vertical;
  min-height: 140px;
  line-height: 1.6;
  transition: all 0.2s;
}
.comment-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(255,95,109,0.1);
}

/* ══════════════════════════════════════
   DROPDOWNS
══════════════════════════════════════ */
.relative { position: relative; }

.dropdown-menu {
  position: absolute;
  right: 0;
  top: calc(100% + 4px);
  background: var(--white);
  border: 1px solid var(--ink-10);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  min-width: 180px;
  z-index: 500;
  overflow: hidden;
}

.dropdown-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 10px 14px;
  font-size: 13px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--ink-60);
  font-family: var(--font);
  transition: background 0.1s;
}
.dropdown-item:hover { background: var(--ink-05); color: var(--ink); }

.hidden { display: none !important; }

/* ══════════════════════════════════════
   SPINNER
══════════════════════════════════════ */
.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--ink-10);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ══════════════════════════════════════
   CLASSROOM COURSES LIST
══════════════════════════════════════ */
.classroom-course-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--ink-10);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s;
}
.classroom-course-item:hover { background: var(--ink-05); border-color: var(--ink-20); }
.classroom-course-item.selected { background: var(--accent-light); border-color: var(--accent); }
.classroom-course-name { font-size: 14px; font-weight: 600; color: var(--ink); }
.classroom-course-section { font-size: 12px; color: var(--ink-40); margin-top: 2px; }

/* ══════════════════════════════════════
   DELETE MODE
══════════════════════════════════════ */
.delete-checkbox {
  width: 18px;
  height: 18px;
  accent-color: #ef4444;
  cursor: pointer;
}

/* ══════════════════════════════════════
   MOBILE OVERLAY
══════════════════════════════════════ */
.mobile-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 199;
}

/* ══════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════ */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.mobile-open {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
  }

  .main-content {
    margin-left: 0;
  }

  .mobile-header {
    display: flex;
  }

  .app-screen {
    padding: 16px;
  }

  .screen-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .screen-title { font-size: 22px; }

  .class-body {
    flex-direction: column;
    height: auto;
  }

  .students-panel {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 300;
    width: 85vw;
    max-width: 320px;
    border-radius: 0;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
  }

  .students-panel.mobile-open {
    transform: translateX(0);
  }

  .close-mobile-btn { display: block; }

  .class-header { flex-direction: column; }
  .class-header-actions { gap: 6px; }
  .class-header-actions .btn-sm { padding: 7px 10px; font-size: 12px; }

  #btnMobileStudents { display: block; }
}

@media (max-width: 480px) {
  .classes-grid { grid-template-columns: 1fr; }
  .modal-box { padding: 20px; }
  .header-actions { gap: 6px; }
}

/* ══════════════════════════════════════
   DRAGGING (per a ordenar alumnes)
══════════════════════════════════════ */
.student-item[draggable="true"] { cursor: grab; }
.student-item[draggable="true"]:active { cursor: grabbing; }
.drag-over { background: var(--accent-light) !important; border: 1px dashed var(--accent) !important; }

/* ══════════════════════════════════════
   PERÍODES BAR (trimestres / projectes)
══════════════════════════════════════ */
.periodes-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 20px;
  background: var(--white);
  border-bottom: 2px solid var(--ink-10);
  min-height: 44px;
  overflow-x: auto;
  flex-shrink: 0;
}
.periodes-tabs {
  display: flex;
  gap: 4px;
  flex: 1;
  overflow-x: auto;
}
.periode-tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 6px 6px 0 0;
  border: 1.5px solid transparent;
  background: none;
  color: var(--ink-40);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  font-family: var(--font);
  transition: all 0.15s;
  margin-bottom: -2px;
}
.periode-tab:hover { background: var(--accent-light); color: var(--accent); }
.periode-tab.active {
  background: var(--white);
  color: var(--accent);
  border-color: var(--ink-10) var(--ink-10) var(--white);
  font-weight: 700;
}
.periode-tab.tancat { }
.periode-tab.tancat:hover { background: var(--accent-light); }
.periode-tab.tancat.active {
  background: var(--white);
  color: var(--accent);
  border-color: var(--ink-10) var(--ink-10) var(--white);
}
.periode-tab-menu {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 13px;
  padding: 0 2px;
  color: var(--ink-20);
  line-height: 1;
  border-radius: 4px;
  transition: all 0.15s;
}
.periode-tab-menu:hover { color: var(--ink); background: rgba(0,0,0,0.06); }
.btn-add-periode {
  flex-shrink: 0;
  width: 28px; height: 28px;
  border-radius: 50%;
  border: 1.5px dashed var(--ink-20);
  background: none;
  color: var(--ink-40);
  font-size: 16px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.15s;
  font-family: var(--font);
}
.btn-add-periode:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-light); }

/* ══════════════════════════════════════
   SIDEBAR CLASSES LIST
══════════════════════════════════════ */
.sidebar-classes-section {
  padding: 0 12px 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.sidebar-classes-label {
  font-size: 10px;
  font-weight: 700;
  color: rgba(255,255,255,0.25);
  text-transform: uppercase;
  letter-spacing: .8px;
  padding: 8px 12px 4px;
}
.sidebar-class-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.45);
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  text-align: left;
  width: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sidebar-class-item:hover { background: rgba(255,255,255,0.06); color: rgba(255,255,255,0.8); }
.sidebar-class-item.active { background: rgba(255,95,109,0.12); color: #fff; font-weight: 600; }
.sidebar-class-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
  flex-shrink: 0;
}
.sidebar-class-item.active .sidebar-class-dot {
  background: var(--accent);
}

/* ══════════════════════════════════════
   COPY BUTTON + HISTORY
══════════════════════════════════════ */
.btn-copy-comment {
  background: none;
  border: 1px solid var(--ink-10);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 14px;
  cursor: pointer;
  color: var(--ink-40);
  transition: all 0.15s;
  line-height: 1;
}
.btn-copy-comment:hover { background: var(--ink-05); color: var(--ink); border-color: var(--ink-20); }

.history-details {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--ink-10);
}
.history-details summary::-webkit-details-marker { display: none; }
.history-item {
  background: #f9fafb;
  border: 1px solid #f3f4f6;
  border-radius: 8px;
  padding: 10px 12px;
}
.history-item:hover { border-color: #e5e7eb; }

/* ══════════════════════════════════════
   BARRA LATERAL: peu sempre visible en pantalles baixes (portàtils)
══════════════════════════════════════ */
.sidebar {
  overflow-y: auto;
  overscroll-behavior: contain;
}
.sidebar-nav {
  flex: 1 0 auto;
}
.sidebar-footer {
  position: sticky;
  bottom: 0;
  background: var(--ink);
  z-index: 1;
}