:root {
  --primary: #F97316;
  --primary-dark: #EA580C;
  --primary-light: #FFEDD5;
  --primary-xlight: #FFF7ED;
  --text: #1F2937;
  --text-muted: #6B7280;
  --border: #E5E7EB;
  --card: #FFFFFF;
  --success: #16A34A;
  --success-light: #DCFCE7;
  --danger: #DC2626;
  --danger-light: #FEE2E2;
  --warning: #D97706;
  --warning-light: #FEF3C7;
  --info: #2563EB;
  --info-light: #DBEAFE;
  --radius: 12px;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
}

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

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--primary-xlight);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

/* ── layout ──────────────────────────────────────────── */
.container { max-width: 960px; margin: 0 auto; padding: 0 1rem; }
.container-sm { max-width: 480px; margin: 0 auto; padding: 0 1rem; }

/* ── navbar ──────────────────────────────────────────── */
.navbar {
  background: var(--primary);
  color: #fff;
  padding: .85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 6px rgba(0,0,0,.15);
  position: sticky; top: 0; z-index: 100;
}
.navbar-brand { font-size: 1.1rem; font-weight: 700; letter-spacing: -.3px; }
.navbar-brand small { display: block; font-size: .7rem; font-weight: 400; opacity: .85; }
.navbar-actions { display: flex; gap: .75rem; align-items: center; }
.btn-logout {
  background: rgba(255,255,255,.2);
  color: #fff; border: none;
  padding: .4rem .9rem; border-radius: 6px;
  cursor: pointer; font-size: .85rem;
  transition: background .2s;
}
.btn-logout:hover { background: rgba(255,255,255,.35); }

/* ── hero card (login page) ──────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  padding: 2rem 1rem;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}
.login-card {
  background: #fff;
  border-radius: 18px;
  padding: 2.5rem 2rem;
  width: 100%; max-width: 420px;
  box-shadow: var(--shadow-lg);
  text-align: center;
}
.login-icon { font-size: 3rem; margin-bottom: .5rem; }
.login-card h1 { font-size: 1.45rem; color: var(--primary-dark); margin-bottom: .25rem; }
.login-card p  { color: var(--text-muted); font-size: .9rem; margin-bottom: 1.75rem; }
.login-link    { display: block; margin-top: 1.25rem; color: var(--text-muted); font-size: .85rem; }
.login-link a  { color: var(--primary); text-decoration: none; font-weight: 600; }
.login-link a:hover { text-decoration: underline; }

/* ── form elements ───────────────────────────────────── */
.form-group { margin-bottom: 1.1rem; text-align: left; }
.form-group label { display: block; font-size: .85rem; font-weight: 600; color: var(--text); margin-bottom: .4rem; }
.form-control {
  width: 100%; padding: .7rem .9rem;
  border: 1.5px solid var(--border);
  border-radius: 8px; font-size: .95rem;
  color: var(--text); background: #fff;
  transition: border-color .2s, box-shadow .2s;
}
.form-control:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(249,115,22,.15);
}
select.form-control { cursor: pointer; }

/* ── buttons ─────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  padding: .65rem 1.4rem; border-radius: 8px;
  font-size: .95rem; font-weight: 600;
  cursor: pointer; border: none; transition: all .2s;
  text-decoration: none;
}
.btn-primary  { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(249,115,22,.4); }
.btn-secondary { background: #f3f4f6; color: var(--text); }
.btn-secondary:hover { background: #e5e7eb; }
.btn-success  { background: var(--success); color: #fff; }
.btn-success:hover { background: #15803d; }
.btn-danger   { background: var(--danger); color: #fff; }
.btn-outline  { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary-light); }
.btn-block    { width: 100%; }
.btn:disabled { opacity: .55; cursor: not-allowed; transform: none !important; }
.btn-sm { padding: .4rem .85rem; font-size: .82rem; }

/* ── cards ───────────────────────────────────────────── */
.card {
  background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden;
}
.card-header {
  background: var(--primary-light); padding: 1rem 1.25rem;
  border-bottom: 1px solid rgba(249,115,22,.15);
  font-weight: 700; color: var(--primary-dark);
  display: flex; align-items: center; gap: .5rem;
}
.card-body { padding: 1.25rem; }

/* ── student info bar ────────────────────────────────── */
.info-bar {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: .75rem;
}
.info-name-row { display: flex; flex-direction: column; gap: .1rem; }
.info-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -.3px;
  text-shadow: 0 1px 4px rgba(0,0,0,.18);
}
.info-label {
  font-size: .7rem;
  font-weight: 600;
  opacity: .72;
  text-transform: uppercase;
  letter-spacing: .6px;
}
.info-details-row {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem 1.5rem;
  padding-top: .5rem;
  border-top: 1px solid rgba(255,255,255,.2);
}
.info-detail-item { display: flex; flex-direction: column; gap: .15rem; }
.info-val { font-size: .92rem; font-weight: 600; color: #fff; }

/* ── progress bar ────────────────────────────────────── */
.progress-wrap { background: #fff; padding: 1rem 1.5rem; border-bottom: 1px solid var(--border); }
.progress-label { display: flex; justify-content: space-between; font-size: .85rem; margin-bottom: .4rem; }
.progress-bar-bg { background: var(--border); border-radius: 99px; height: 8px; overflow: hidden; }
.progress-bar-fill { background: var(--primary); height: 100%; border-radius: 99px; transition: width .4s ease; }
.progress-bar-fill.done { background: var(--success); }

/* ── group grid ──────────────────────────────────────── */
.groups-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
  padding: 1.5rem;
}
.group-card {
  background: #fff; border-radius: var(--radius);
  border: 2px solid var(--border);
  padding: 1.1rem;
  transition: border-color .2s, box-shadow .2s, transform .2s;
  cursor: pointer;
}
.group-card:hover:not(.rated) {
  border-color: var(--primary); box-shadow: 0 4px 16px rgba(249,115,22,.2);
  transform: translateY(-2px);
}
.group-card.rated {
  background: var(--success-light); border-color: var(--success);
  cursor: default; opacity: .85;
}
.group-card-title {
  font-size: 1rem; font-weight: 700; color: var(--primary-dark);
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: .6rem;
}
.group-card.rated .group-card-title { color: var(--success); }
.badge-done {
  background: var(--success); color: #fff;
  font-size: .7rem; padding: .2rem .5rem; border-radius: 99px; font-weight: 600;
}
.badge-pending {
  background: var(--primary-light); color: var(--primary-dark);
  font-size: .7rem; padding: .2rem .5rem; border-radius: 99px; font-weight: 600;
}
.badge-locked {
  background: #F3F4F6; color: var(--text-muted);
  font-size: .7rem; padding: .2rem .5rem; border-radius: 99px; font-weight: 600;
}
.group-card.locked {
  background: #F9FAFB; border-color: #E5E7EB;
  cursor: default; opacity: .75;
}
.group-card.locked .group-card-title { color: var(--text-muted); }
.member-list { font-size: .8rem; color: var(--text-muted); }
.member-list li { padding: .15rem 0; list-style: none; }
.member-list li::before { content: '• '; color: var(--primary); }

/* ── star rating ─────────────────────────────────────── */
.criteria-list { display: flex; flex-direction: column; gap: 1.25rem; }
.criterion-row { background: #fafafa; border: 1px solid var(--border); border-radius: 10px; padding: 1rem 1.1rem; }
.criterion-header { margin-bottom: .6rem; }
.criterion-header strong { display: block; font-size: .95rem; }
.criterion-header small { color: var(--text-muted); font-size: .8rem; }
.star-row { display: flex; gap: .4rem; flex-wrap: wrap; }
.star-btn {
  width: 2.6rem; height: 2.6rem; border-radius: 8px;
  border: 2px solid var(--border);
  background: #fff; font-size: 1.1rem;
  cursor: pointer; transition: all .15s;
  display: flex; align-items: center; justify-content: center;
}
.star-btn:hover { border-color: var(--primary); background: var(--primary-light); }
.star-btn.selected { background: var(--primary); border-color: var(--primary); color: #fff; }
.star-label { font-size: .7rem; color: var(--text-muted); text-align: center; margin-top: .2rem; }

/* ── score total banner ──────────────────────────────── */
.score-total {
  background: linear-gradient(90deg, var(--primary), var(--primary-dark));
  color: #fff; border-radius: 10px; padding: 1rem 1.25rem;
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 1.25rem;
}
.score-total .score-num { font-size: 2rem; font-weight: 800; }
.score-total .score-label { font-size: .85rem; opacity: .85; }

/* ── teacher dashboard nav cards ─────────────────────── */
.nav-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 1.1rem; padding: 1.5rem 0; }
.nav-card {
  background: #fff; border-radius: var(--radius); padding: 1.4rem;
  border: 2px solid transparent; text-decoration: none; color: var(--text);
  box-shadow: var(--shadow); transition: all .2s;
  display: flex; flex-direction: column; gap: .5rem;
}
.nav-card:hover { border-color: var(--primary); transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.nav-card .nav-icon { font-size: 2rem; }
.nav-card strong { font-size: 1rem; color: var(--primary-dark); }
.nav-card small { color: var(--text-muted); font-size: .8rem; }

/* ── tables ──────────────────────────────────────────── */
.table-wrap { overflow-x: auto; border-radius: 10px; border: 1px solid var(--border); }
table { width: 100%; border-collapse: collapse; font-size: .88rem; }
thead th { background: var(--primary); color: #fff; padding: .65rem .9rem; text-align: left; white-space: nowrap; }
tbody td { padding: .6rem .9rem; border-bottom: 1px solid var(--border); vertical-align: middle; }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--primary-xlight); }
.rank-1 td:first-child { color: #F59E0B; font-weight: 800; font-size: 1.1rem; }
.rank-2 td:first-child { color: #9CA3AF; font-weight: 700; }
.rank-3 td:first-child { color: #B45309; font-weight: 700; }

/* ── alerts ──────────────────────────────────────────── */
.alert { padding: .75rem 1rem; border-radius: 8px; font-size: .9rem; margin-bottom: 1rem; }
.alert-success { background: var(--success-light); color: var(--success); border-left: 4px solid var(--success); }
.alert-danger  { background: var(--danger-light);  color: var(--danger);  border-left: 4px solid var(--danger); }
.alert-warning { background: var(--warning-light); color: var(--warning); border-left: 4px solid var(--warning); }
.alert-info    { background: var(--info-light);    color: var(--info);    border-left: 4px solid var(--info); }

/* ── tabs ────────────────────────────────────────────── */
.tabs { display: flex; gap: .5rem; margin-bottom: 1.25rem; border-bottom: 2px solid var(--border); padding-bottom: 0; }
.tab-btn {
  padding: .5rem 1.2rem; border: none; background: none;
  font-size: .9rem; font-weight: 600; color: var(--text-muted);
  cursor: pointer; border-bottom: 3px solid transparent; margin-bottom: -2px;
  transition: color .2s, border-color .2s;
}
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }
.tab-pane { display: none; }
.tab-pane.active { display: block; }

/* ── upload dropzone ─────────────────────────────────── */
.dropzone {
  border: 2.5px dashed var(--primary); border-radius: var(--radius);
  padding: 2.5rem 1rem; text-align: center;
  background: var(--primary-xlight); cursor: pointer;
  transition: background .2s;
}
.dropzone:hover, .dropzone.drag { background: var(--primary-light); }
.dropzone p { color: var(--text-muted); font-size: .9rem; margin-top: .5rem; }

/* ── completion badge ────────────────────────────────── */
.status-done    { color: var(--success); font-weight: 600; }
.status-pending { color: var(--warning); font-weight: 600; }
.status-none    { color: var(--text-muted); }

/* ── score pill ──────────────────────────────────────── */
.score-pill {
  display: inline-block; padding: .2rem .6rem;
  border-radius: 99px; font-size: .82rem; font-weight: 700;
}
.score-pill.high   { background: var(--success-light); color: var(--success); }
.score-pill.mid    { background: var(--warning-light); color: var(--warning); }
.score-pill.low    { background: var(--danger-light);  color: var(--danger); }

/* ── misc ────────────────────────────────────────────── */
.page-title { font-size: 1.3rem; font-weight: 800; color: var(--primary-dark); margin: 1.5rem 0 .75rem; }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.mt-1 { margin-top: .5rem; } .mt-2 { margin-top: 1rem; } .mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: .5rem; } .mb-2 { margin-bottom: 1rem; }
.gap-1 { gap: .5rem; } .flex { display: flex; } .flex-wrap { flex-wrap: wrap; }
.spinner { display: inline-block; width: 1rem; height: 1rem; border: 2px solid rgba(255,255,255,.4); border-top-color: #fff; border-radius: 50%; animation: spin .7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.hidden { display: none !important; }

/* ── criterion score bar ─────────────────────────────── */
.crit-bar-wrap { display: flex; align-items: center; gap: .5rem; font-size: .8rem; }
.crit-bar-bg { flex: 1; background: var(--border); border-radius: 99px; height: 6px; overflow: hidden; }
.crit-bar-fill { background: var(--primary); height: 100%; border-radius: 99px; }

/* ── responsive ──────────────────────────────────────── */
@media (max-width: 600px) {
  .groups-grid { grid-template-columns: 1fr; padding: 1rem; }
  .nav-cards { grid-template-columns: 1fr 1fr; }
  .login-card { padding: 2rem 1.25rem; }
}