/* Modern login screen + password eye button (all dark) */
.login-screen { background: radial-gradient(ellipse at 30% 20%, #1a2540 0%, #0d1117 65%); }
.login-card {
  width: 400px; max-width: calc(100vw - 32px);
  padding: 40px 34px 30px; border-radius: 22px;
  background: #161b22; border: 1px solid #2a3140;
  box-shadow: 0 24px 70px rgba(0,0,0,.55), 0 0 0 1px rgba(79,142,247,.06);
  animation: lgCardIn .35s ease both;
}
@keyframes lgCardIn { from { opacity: 0; transform: translateY(10px) scale(.985); } to { opacity: 1; transform: none; } }
.login-logo { flex-direction: column; justify-content: center; margin-bottom: 26px; text-align: center; }
.login-logo-text { font-size: 1.5em; font-weight: 700; letter-spacing: -.01em; color: #f0f6fc; }
.login-sub { text-align: center; color: #9aa7bd; font-size: .95em; margin-bottom: 6px; }
.login-roles, .login-form, .login-loading { animation: lgFade .28s ease both; }
@keyframes lgFade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.login-card .login-role-btn {
  flex-direction: row; align-items: center; gap: 14px; min-height: 76px; padding: 14px 16px;
  background: #1c2128; border: 1px solid #2f3846; border-radius: 14px; text-align: left;
  transition: background .18s, border-color .18s, transform .18s, box-shadow .18s;
}
.login-card .login-role-btn:hover { background: #222a35; border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 8px 22px rgba(0,0,0,.35); }
.login-card .login-role-btn.teacher:hover { border-color: #a78bfa; }
.login-card .login-role-btn:active { transform: translateY(0); }
.login-card .login-role-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.login-card .lrb-icon { width: 46px; height: 46px; flex: none; border-radius: 12px; display: flex; align-items: center; justify-content: center;
  background: rgba(79,142,247,.14); color: var(--accent); font-size: 1em; }
.login-card .login-role-btn.teacher .lrb-icon { background: rgba(167,139,250,.14); color: #a78bfa; }
.login-card .login-role-btn svg { margin: 0; color: inherit; }
.login-card .lrb-text { display: flex; flex-direction: column; gap: 2px; flex: 1; min-width: 0; font-size: 1em; color: #e6edf3; }
.login-card .lrb-text b { font-weight: 600; font-size: 1.05em; }
.login-card .lrb-text span { font-size: .86em; color: #8b98ad; }
.login-card .lrb-arrow { font-size: 1.8em; color: #6b7789; line-height: 1; transition: transform .18s, color .18s; }
.login-card .login-role-btn:hover .lrb-arrow { transform: translateX(3px); color: #e6edf3; }

.login-form { gap: 14px; }
.login-form-title { font-size: 1.25em; font-weight: 700; color: #f0f6fc; text-align: center; margin-bottom: 2px; }
.lf-field { position: relative; }
.login-card .lf-field input {
  width: 100%; padding: 22px 14px 8px; height: 54px; background: #0d1117; border: 1px solid #30363d;
  border-radius: 12px; color: #e6edf3; font-size: 1em; outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.login-card .lf-field input[type="password"], .login-card .lf-field input.pw-shown { padding-right: 48px; }
.login-card .lf-field input:hover { border-color: #3d4656; }
.login-card .lf-field input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(79,142,247,.25); }
.lf-field label {
  position: absolute; left: 15px; top: 17px; color: #8b98ad; font-size: 1em; pointer-events: none;
  transform-origin: left top; transition: transform .15s ease, color .15s ease;
}
.lf-field input:focus + label, .lf-field input:not(:placeholder-shown) + label { transform: translateY(-11px) scale(.76); }
.lf-field input:focus + label { color: var(--accent); }
.lf-field input:-webkit-autofill + label { transform: translateY(-11px) scale(.76); }

.lf-remember { display: flex; align-items: center; gap: 10px; color: #c9d1d9; font-size: .93em; cursor: pointer; user-select: none; }
.lf-remember input { position: absolute; opacity: 0; width: 0; height: 0; }
.lf-check { width: 20px; height: 20px; border-radius: 6px; border: 1px solid #3d4656; background: #0d1117; display: inline-flex; align-items: center; justify-content: center; transition: background .15s, border-color .15s, box-shadow .15s; }
.lf-remember input:checked + .lf-check { background: var(--accent); border-color: var(--accent); }
.lf-remember input:checked + .lf-check::after { content: ''; width: 5px; height: 10px; border: solid #fff; border-width: 0 2px 2px 0; transform: rotate(45deg) translate(-1px,-1px); }
.lf-remember input:focus-visible + .lf-check { box-shadow: 0 0 0 3px rgba(79,142,247,.35); }

.login-card .login-submit-btn {
  height: 50px; border-radius: 12px; font-size: 1.05em; margin-top: 2px;
  background: linear-gradient(180deg, #5a98ff, #3a7ae0); box-shadow: 0 6px 18px rgba(79,142,247,.3);
  transition: transform .15s, box-shadow .15s, filter .15s;
}
.login-card .login-submit-btn:hover { filter: brightness(1.08); box-shadow: 0 8px 22px rgba(79,142,247,.4); background: linear-gradient(180deg, #5a98ff, #3a7ae0); }
.login-card .login-submit-btn:active { transform: translateY(1px); }
.login-card .login-back-btn { padding: 8px; color: #8b98ad; }
.login-error { background: rgba(248,113,113,.1); border: 1px solid rgba(248,113,113,.35); border-radius: 10px; padding: 8px 12px; color: #fca5a5; }

/* Password eye: always visible, independent of the input being empty */
.pw-wrap { display: block; position: relative; flex: 1 1 auto; min-width: 0; }
.pw-wrap > input { width: 100%; padding-right: 44px !important; }
.pw-eye {
  position: absolute; right: 6px; top: 50%; transform: translateY(-50%); z-index: 2;
  width: 38px; height: 38px; display: inline-flex; align-items: center; justify-content: center;
  background: none; border: none; border-radius: 8px; color: #9aa7bd; cursor: pointer; padding: 0;
  opacity: 1 !important; visibility: visible !important; pointer-events: auto !important;
}
.pw-eye:hover { color: #e6edf3; background: rgba(255,255,255,.07); }
.pw-eye:focus-visible { outline: 2px solid var(--accent); }
.pw-eye svg { pointer-events: none; }
.lf-field .pw-eye { top: 27px; }

/* Student picker: back button */
.act-stu-back { margin: 0 0 14px; padding: 8px 14px; background: #1c2128; color: #c9d1d9; border: 1px solid #30363d; border-radius: 8px; cursor: pointer; font: inherit; }
.act-stu-back:hover { background: #222a35; color: #f0f6fc; }

/* Settings modal: larger, two columns on wide screens */
.modal-overlay#settingsModal { align-items: flex-start; overflow-y: auto; padding: 4vh 12px; }
.modal.settings-modal { margin: 0 auto; width: min(720px, 94vw); max-width: 94vw; max-height: 90vh; overflow-y: auto; }
@media (min-width: 720px) {
  .settings-modal { display: grid; grid-template-columns: 1fr 1fr; column-gap: 28px; align-content: start; }
  .settings-modal > h3, .settings-modal > .modal-actions { grid-column: 1 / -1; }
  .settings-modal > .settings-row[style*="column"] { grid-column: 1 / -1; }
  .settings-modal > .settings-row:last-of-type { border-bottom: 1px solid var(--border); }
}
@media (max-width: 719px) { .settings-modal { display: block; } }

/* Teacher: hide "no groups" UI until the first groups fetch resolves */
.app-layout.groups-pending #emptyNewGroupBtn,
.app-layout.groups-pending #emptyStateHint,
.app-layout.groups-pending #groupsList .panel-empty { visibility: hidden !important; }

/* Collapsed groups panel: bigger, comfortable click targets */
.groups-panel:not(:hover) .group-item { min-height: 48px; justify-content: center; padding: 10px 4px; }
.groups-panel .group-item-icon { font-size: 1.85em; }
.groups-panel .panel-header { min-height: 54px; }
.sidebar-toggle, .topbar-sidebar-toggle, #sidebarToggle { min-width: 36px; min-height: 36px; } 
.sidebar-toggle, .topbar-sidebar-toggle { justify-content: center; align-items: center; }