:root {
  --bg: #0a0a0f;
  --surface: #11111a;
  --surface2: #16161f;
  --border: rgba(255,255,255,0.07);
  --border2: rgba(255,255,255,0.12);
  --accent: #7b6ef6;
  --accent2: #e8c56d;
  --accent-dim: rgba(123,110,246,0.12);
  --text: #e8e6f0;
  --muted: #6b6880;
  --muted2: #9996aa;
  --success: #4ade80;
  --danger: #f87171;
  --warning: #fbbf24;
  --sidebar-w: 240px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Syne', sans-serif;
  display: flex;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Sidebar ───────────────────────────────────────────── */
.sidebar {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--sidebar-w);
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 200;
  transition: transform 0.3s ease;
}

.sidebar-header {
  padding: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}
.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.logo-icon {
  color: var(--accent);
  font-size: 1.3rem;
}
.logo-text {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  color: var(--text);
}
.sidebar-toggle {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 1rem;
  display: none;
  padding: 0.25rem;
}

.sidebar-nav {
  flex: 1;
  padding: 1.5rem 1rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.nav-group { display: flex; flex-direction: column; gap: 0.25rem; }
.nav-group-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0 0.5rem;
  margin-bottom: 0.5rem;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.75rem;
  border-radius: 6px;
  text-decoration: none;
  color: var(--muted2);
  font-size: 0.88rem;
  font-weight: 600;
  transition: all 0.2s;
}
.nav-item:hover { background: var(--accent-dim); color: var(--text); }
.nav-item.active { background: var(--accent-dim); color: var(--accent); }
.nav-icon { font-size: 0.9rem; width: 18px; text-align: center; }

.sidebar-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border);
}
.user-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.user-avatar {
  width: 34px; height: 34px;
  border-radius: 50%;
  background: var(--accent-dim);
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 0.7rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.05em;
}
.user-name { font-size: 0.82rem; font-weight: 700; }
.user-role { font-size: 0.7rem; color: var(--muted); margin-top: 1px; }

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

/* ── Topbar ────────────────────────────────────────────── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10,10,15,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0.9rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.topbar-left { display: flex; align-items: center; gap: 1rem; }
.menu-btn {
  background: none;
  border: none;
  color: var(--muted2);
  font-size: 1.2rem;
  cursor: pointer;
  display: none;
  padding: 0.2rem;
  transition: color 0.2s;
}
.menu-btn:hover { color: var(--text); }
.breadcrumb {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--muted);
  letter-spacing: 0.05em;
}
.topbar-right { display: flex; align-items: center; gap: 1rem; }
.search-box {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.45rem 0.9rem;
  color: var(--muted);
  font-size: 1rem;
}
.search-box input {
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-family: 'Syne', sans-serif;
  font-size: 0.82rem;
  width: 180px;
}
.search-box input::placeholder { color: var(--muted); }
.back-link {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.08em;
  white-space: nowrap;
  transition: color 0.2s;
}
.back-link:hover { color: var(--accent); }

/* ── Content ───────────────────────────────────────────── */
.content { padding: 2.5rem 2rem; flex: 1; }

.view { display: none; }
.view.active { display: block; }

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 2rem;
  gap: 1rem;
}
.page-title {
  font-family: 'DM Serif Display', serif;
  font-size: 2rem;
  line-height: 1.1;
}
.page-sub {
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 0.3rem;
}

/* ── Stats row ─────────────────────────────────────────── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.stat-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  transition: border-color 0.2s;
}
.stat-box:hover { border-color: rgba(123,110,246,0.3); }
.stat-val {
  font-family: 'DM Serif Display', serif;
  font-size: 2.2rem;
  color: var(--accent2);
  line-height: 1;
  margin-bottom: 0.35rem;
}
.stat-label {
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}
.stat-trend { font-size: 0.7rem; color: var(--muted); }
.stat-trend.up { color: var(--success); }

/* ── Card ──────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.card-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.card-title { font-size: 0.9rem; font-weight: 700; }

.dash-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

/* ── Bar chart ─────────────────────────────────────────── */
.chart-wrap { padding: 1.5rem; display: flex; flex-direction: column; gap: 1rem; }
.bar-item { display: flex; flex-direction: column; gap: 0.4rem; }
.bar-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--muted2);
}
.bar-track {
  height: 6px;
  background: rgba(255,255,255,0.05);
  border-radius: 3px;
  overflow: hidden;
}
.bar-fill {
  height: 100%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: width 0.8s cubic-bezier(.4,0,.2,1);
}

/* ── Recent list ───────────────────────────────────────── */
.recent-list { padding: 0.5rem 0; }
.recent-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.82rem;
  transition: background 0.15s;
}
.recent-item:last-child { border-bottom: none; }
.recent-item:hover { background: rgba(255,255,255,0.02); }
.recent-name { font-weight: 600; }
.recent-disc { color: var(--muted); font-size: 0.75rem; margin-top: 2px; }
.recent-nota {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  font-weight: 700;
}

/* ── Table ─────────────────────────────────────────────── */
.table { width: 100%; border-collapse: collapse; }
.table th {
  text-align: left;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.01);
}
.table td {
  padding: 1rem 1.5rem;
  font-size: 0.85rem;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s;
}
.table tr:last-child td { border-bottom: none; }
.table tr:hover td { background: rgba(255,255,255,0.02); }

.badge {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  padding: 0.2rem 0.6rem;
  border-radius: 2px;
  font-weight: 400;
}
.badge-green { background: rgba(74,222,128,0.1); color: var(--success); border: 1px solid rgba(74,222,128,0.2); }
.badge-red   { background: rgba(248,113,113,0.1); color: var(--danger);  border: 1px solid rgba(248,113,113,0.2); }
.badge-yellow{ background: rgba(251,191,36,0.1);  color: var(--warning); border: 1px solid rgba(251,191,36,0.2); }
.badge-blue  { background: rgba(123,110,246,0.1); color: var(--accent);  border: 1px solid rgba(123,110,246,0.2); }

.action-btns { display: flex; gap: 0.5rem; }
.btn-icon {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted2);
  border-radius: 4px;
  padding: 0.3rem 0.6rem;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-icon:hover { border-color: var(--accent); color: var(--accent); }
.btn-icon.danger:hover { border-color: var(--danger); color: var(--danger); }

/* ── Disciplinas grid ──────────────────────────────────── */
.disc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}
.disc-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  transition: all 0.25s;
  position: relative;
  overflow: hidden;
}
.disc-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
}
.disc-card:hover { transform: translateY(-4px); border-color: rgba(123,110,246,0.25); }
.disc-codigo {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 0.6rem;
}
.disc-nome { font-size: 1rem; font-weight: 700; margin-bottom: 0.5rem; }
.disc-prof { font-size: 0.78rem; color: var(--muted); margin-bottom: 1rem; }
.disc-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.disc-carga { font-size: 0.72rem; color: var(--muted); }
.disc-actions { display: flex; gap: 0.4rem; }

/* ── Notas ─────────────────────────────────────────────── */
.filters-bar {
  margin-bottom: 1.25rem;
  display: flex;
  gap: 1rem;
}
.select-input {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: 'Syne', sans-serif;
  font-size: 0.85rem;
  padding: 0.6rem 1rem;
  border-radius: 6px;
  outline: none;
  cursor: pointer;
  transition: border-color 0.2s;
  min-width: 260px;
}
.select-input:focus { border-color: var(--accent); }

.nota-input {
  width: 60px;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  padding: 0.35rem 0.5rem;
  border-radius: 4px;
  text-align: center;
  outline: none;
}
.nota-input:focus { border-color: var(--accent); }

.media-val { font-family: 'JetBrains Mono', monospace; font-weight: 700; }
.media-ok  { color: var(--success); }
.media-rep { color: var(--danger); }
.media-rec { color: var(--warning); }

.empty-state {
  text-align: center;
  padding: 5rem 2rem;
  color: var(--muted);
}
.empty-icon { font-size: 2.5rem; margin-bottom: 1rem; opacity: 0.3; }

/* ── Relatórios ────────────────────────────────────────── */
.relatorio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}
.rel-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.75rem;
}
.rel-card h3 { font-size: 0.9rem; margin-bottom: 1.25rem; }
.rel-stat {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.82rem;
}
.rel-stat:last-child { border-bottom: none; }
.rel-stat-label { color: var(--muted); }
.rel-stat-val { font-family: 'JetBrains Mono', monospace; }

/* ── Buttons ───────────────────────────────────────────── */
.btn-primary {
  background: var(--accent);
  color: #fff;
  border: 1.5px solid var(--accent);
  padding: 0.65rem 1.4rem;
  font-family: 'Syne', sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}
.btn-primary:hover { background: transparent; color: var(--accent); }
.btn-ghost {
  background: transparent;
  color: var(--muted2);
  border: 1.5px solid var(--border);
  padding: 0.65rem 1.4rem;
  font-family: 'Syne', sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-ghost:hover { border-color: var(--text); color: var(--text); }

/* ── Modal ─────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(4px);
  z-index: 500;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.modal-overlay.open { display: flex; }
.modal {
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 10px;
  width: 100%;
  max-width: 480px;
  animation: modalIn 0.25s ease;
}
@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}
.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal-header h3 { font-size: 0.95rem; font-weight: 700; }
.modal-close {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 1rem;
  transition: color 0.2s;
}
.modal-close:hover { color: var(--text); }
.modal-body { padding: 1.5rem; display: flex; flex-direction: column; gap: 1.1rem; }
.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

.field-group { display: flex; flex-direction: column; gap: 0.4rem; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.field-group label { font-size: 0.75rem; color: var(--muted); font-weight: 600; letter-spacing: 0.04em; }
.field-group input, .field-group select {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: 'Syne', sans-serif;
  font-size: 0.88rem;
  padding: 0.65rem 0.9rem;
  border-radius: 6px;
  outline: none;
  transition: border-color 0.2s;
}
.field-group input:focus, .field-group select:focus { border-color: var(--accent); }
.field-group select { cursor: pointer; }

/* ── Toast ─────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-left: 3px solid var(--accent);
  color: var(--text);
  padding: 0.9rem 1.4rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  z-index: 999;
  transform: translateY(20px);
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
}
.toast.show { transform: translateY(0); opacity: 1; }

/* ── Responsive ────────────────────────────────────────── */
@media (max-width: 900px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-toggle { display: block; }
  .menu-btn { display: block; }
  .main-wrapper { margin-left: 0; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .dash-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .content { padding: 1.5rem 1rem; }
  .stats-row { grid-template-columns: 1fr; }
  .topbar { padding: 0.9rem 1rem; }
  .search-box { display: none; }
}