:root {
  --bg: #0a0e1a;
  --bg-elev: #121a2c;
  --bg-elev-2: #1a2438;
  --bg-elev-3: #212d47;
  --border: #232f47;
  --border-soft: #1a2438;
  --text: #f3f6fb;
  --text-dim: #a3adc6;
  --text-faint: #6c7890;
  --accent: #ff6a1a;
  --accent-2: #ff9248;
  --accent-dim: #ff6a1a1f;
  --accent-text: #ffb28a;
  --ok: #34c98e;
  --danger: #ff5c6c;
  --radius: 14px;
  --radius-sm: 9px;
  --radius-lg: 20px;
  --shadow-sm: 0 2px 10px rgba(0,0,0,.22);
  --shadow: 0 10px 34px rgba(0,0,0,.4);
  --shadow-glow: 0 6px 20px rgba(255,106,26,.28);
  --grad-accent: linear-gradient(135deg, var(--accent), var(--accent-2));
  --grad-bg-1: rgba(255,106,26,.10);
  --grad-bg-2: rgba(52,120,201,.07);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Inter Tight', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --muscle-active: #ff6a1a;
  --muscle-inactive: #4a5b85;
  --muscle-neutral: #5b6a92;
  --muscle-diagram-bg: #0d1526;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f4f5f9;
    --bg-elev: #ffffff;
    --bg-elev-2: #f0f2f7;
    --bg-elev-3: #e7e9f1;
    --border: #e2e5ee;
    --border-soft: #ecedf3;
    --text: #10192e;
    --text-dim: #4c5871;
    --text-faint: #808ba3;
    --accent: #e85f14;
    --accent-2: #ff8a3d;
    --accent-dim: #e85f1418;
    --accent-text: #b8460a;
    --shadow-sm: 0 2px 10px rgba(20,30,60,.06);
    --shadow: 0 10px 30px rgba(20,30,60,.10);
    --shadow-glow: 0 6px 20px rgba(232,95,20,.20);
    --grad-bg-1: rgba(232,95,20,.06);
    --grad-bg-2: rgba(52,120,201,.05);
    --muscle-active: #e85f14;
    --muscle-inactive: #c3cbe0;
    --muscle-neutral: #aab3cc;
    --muscle-diagram-bg: #e7eaf3;
  }
}
:root[data-theme="light"] {
  --bg: #f4f5f9;
  --bg-elev: #ffffff;
  --bg-elev-2: #f0f2f7;
  --bg-elev-3: #e7e9f1;
  --border: #e2e5ee;
  --border-soft: #ecedf3;
  --text: #10192e;
  --text-dim: #4c5871;
  --text-faint: #808ba3;
  --accent: #e85f14;
  --accent-2: #ff8a3d;
  --accent-dim: #e85f1418;
  --accent-text: #b8460a;
  --shadow-sm: 0 2px 10px rgba(20,30,60,.06);
  --shadow: 0 10px 30px rgba(20,30,60,.10);
  --shadow-glow: 0 6px 20px rgba(232,95,20,.20);
  --grad-bg-1: rgba(232,95,20,.06);
  --grad-bg-2: rgba(52,120,201,.05);
  --muscle-active: #e85f14;
  --muscle-inactive: #c3cbe0;
  --muscle-neutral: #aab3cc;
  --muscle-diagram-bg: #e7eaf3;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden; /* rolagem fica só dentro do conteúdo/sidebar, menu nunca some */
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
h1, h2, h3, h4 { font-family: var(--font-display); letter-spacing: -.01em; }

/* scrollbars finos e discretos */
.sidebar, .content, .detail-panel {
  scrollbar-width: thin;
  scrollbar-color: var(--bg-elev-3) transparent;
}
.sidebar::-webkit-scrollbar, .content::-webkit-scrollbar, .detail-panel::-webkit-scrollbar { width: 9px; }
.sidebar::-webkit-scrollbar-thumb, .content::-webkit-scrollbar-thumb, .detail-panel::-webkit-scrollbar-thumb {
  background: var(--bg-elev-3); border-radius: 999px; border: 2px solid var(--bg-elev);
}
.sidebar::-webkit-scrollbar-thumb:hover, .content::-webkit-scrollbar-thumb:hover, .detail-panel::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ---- layout ---- */
.app-shell {
  display: flex; flex-direction: column; height: 100vh; position: relative;
}
.app-shell::before {
  content: ''; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(900px 500px at 8% -8%, var(--grad-bg-1), transparent 60%),
    radial-gradient(700px 460px at 100% 0%, var(--grad-bg-2), transparent 55%);
}
.topbar, .main-layout { position: relative; z-index: 1; }

.topbar {
  display: flex; align-items: center; gap: 18px;
  padding: 13px 22px;
  background: color-mix(in srgb, var(--bg-elev) 88%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  z-index: 40;
}
.brand { display: flex; align-items: center; gap: 12px; font-weight: 800; letter-spacing: -.01em; white-space: nowrap; font-family: var(--font-display); font-size: 14.5px; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 10px; flex-shrink: 0;
  background: var(--grad-accent); box-shadow: var(--shadow-glow);
  display: flex; align-items: center; justify-content: center; color: #1a0f08;
}
.brand-mark svg { width: 18px; height: 18px; }
.brand small { display:block; font-weight: 500; color: var(--text-faint); font-size: 11px; letter-spacing: 0; margin-top: 1px; }

.search-wrap { flex: 1; max-width: 560px; position: relative; }
.search-wrap input {
  width: 100%; padding: 11px 16px 11px 40px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--bg-elev-2); color: var(--text);
  font-size: 14px; outline: none; transition: box-shadow .15s, border-color .15s, background .15s;
}
.search-wrap input:focus { border-color: var(--accent); background: var(--bg-elev); box-shadow: 0 0 0 4px var(--accent-dim); }
.search-wrap input::placeholder { color: var(--text-faint); }
.search-wrap svg { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); opacity: .55; width: 16px; height: 16px; pointer-events: none; }

.topbar-actions { display: flex; gap: 8px; align-items: center; margin-left: auto; }
.btn {
  padding: 9px 15px; border-radius: 999px; border: 1px solid var(--border);
  background: var(--bg-elev-2); color: var(--text); font-size: 13px; font-weight: 600;
  display: inline-flex; align-items: center; gap: 6px; white-space: nowrap;
  transition: border-color .15s, transform .12s, box-shadow .15s, background .15s;
}
.btn:hover { border-color: var(--accent); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn.primary { background: var(--grad-accent); border-color: transparent; color: #1a0f08; box-shadow: var(--shadow-glow); }
.btn.primary:hover { filter: brightness(1.06); box-shadow: 0 8px 24px rgba(255,106,26,.38); }
.btn.ghost { background: transparent; }
.btn.sm { padding: 6px 12px; font-size: 12px; }

.main-layout { display: flex; flex: 1; min-height: 0; }

.sidebar {
  width: 252px; flex-shrink: 0; border-right: 1px solid var(--border);
  padding: 20px 14px; overflow-y: auto; background: color-mix(in srgb, var(--bg-elev) 92%, transparent);
  height: 100%;
}
.sidebar h4 { font-size: 10.5px; text-transform: uppercase; letter-spacing: .8px; color: var(--text-faint); margin: 20px 4px 9px; font-weight: 700; }
.sidebar h4:first-child { margin-top: 0; }
.filter-list { display: flex; flex-direction: column; gap: 2px; }
.filter-item {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 11px; border-radius: var(--radius-sm); font-size: 13.5px; color: var(--text-dim);
  transition: background .15s, color .15s, transform .12s;
  position: relative;
}
.filter-item:hover { background: var(--bg-elev-2); color: var(--text); transform: translateX(1px); }
.filter-item.active { background: var(--accent-dim); color: var(--accent-text); font-weight: 700; box-shadow: inset 3px 0 0 var(--accent); }
.filter-item .count { font-size: 11px; color: var(--text-faint); font-weight: 600; }
.filter-item.active .count { color: var(--accent-text); opacity: .85; }

.content { flex: 1; min-width: 0; overflow-y: auto; padding: 24px 28px 60px; }
.content-header { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 18px; flex-wrap: wrap; gap: 8px; }
.content-header h2 { margin: 0; font-size: 21px; font-weight: 800; }
.content-header .sub { color: var(--text-faint); font-size: 13px; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(236px, 1fr)); gap: 13px; }
.card {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 15px; cursor: pointer; transition: border-color .18s, transform .18s, box-shadow .18s;
  position: relative; overflow: hidden;
}
.card::after {
  content: ''; position: absolute; inset: 0; border-radius: inherit; padding: 1px;
  background: var(--grad-accent); opacity: 0; transition: opacity .18s;
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; pointer-events: none;
}
.card:hover { border-color: transparent; transform: translateY(-3px); box-shadow: var(--shadow); }
.card:hover::after { opacity: 1; }
.card .cat-tag { font-size: 10.5px; color: var(--accent-text); font-weight: 700; text-transform: uppercase; letter-spacing: .5px; }
.card h3 { margin: 7px 0 9px; font-size: 15px; line-height: 1.3; font-weight: 700; }
.card .muscles { display: flex; flex-wrap: wrap; gap: 4px; }
.chip {
  font-size: 10.5px; padding: 3px 9px; border-radius: 999px; background: var(--bg-elev-2);
  color: var(--text-dim); border: 1px solid var(--border-soft); font-weight: 500;
}
.card .media-badge { float: right; font-size: 14px; opacity: .7; color: var(--accent); }

.empty-state { text-align: center; padding: 70px 20px; color: var(--text-faint); }

/* ---- detail panel (modal) ---- */
.overlay {
  position: fixed; inset: 0; background: rgba(4,8,16,.55); backdrop-filter: blur(3px);
  display: flex; justify-content: flex-end; z-index: 100;
}
.detail-panel {
  width: min(640px, 100%); height: 100%; background: var(--bg-elev); overflow-y: auto;
  border-left: 1px solid var(--border); box-shadow: -18px 0 46px rgba(0,0,0,.28);
  animation: slidein .22s cubic-bezier(.22,.9,.32,1);
}
@keyframes slidein { from { transform: translateX(28px); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
.detail-head {
  padding: 22px 26px; border-bottom: 1px solid var(--border); position: sticky; top: 0;
  background: color-mix(in srgb, var(--bg-elev) 90%, transparent); backdrop-filter: blur(10px); z-index: 2;
}
.detail-head .close { float: right; }
.detail-head .cat-tag { font-size: 11px; color: var(--accent-text); font-weight: 700; text-transform: uppercase; letter-spacing: .5px; }
.detail-head h2 { margin: 7px 0 0; font-size: 23px; font-weight: 800; }
.detail-body { padding: 22px 26px; display: flex; flex-direction: column; gap: 24px; }
.detail-section h4 { margin: 0 0 9px; font-size: 11.5px; text-transform: uppercase; letter-spacing: .6px; color: var(--text-faint); font-weight: 700; }
.detail-section p { margin: 0; color: var(--text-dim); }
.step-list { margin: 0; padding-left: 20px; display: flex; flex-direction: column; gap: 7px; color: var(--text-dim); }
.error-list { margin: 0; padding-left: 20px; display: flex; flex-direction: column; gap: 7px; color: var(--text-dim); }
.error-list li::marker { color: var(--danger); }
.tip-box { background: var(--accent-dim); border: 1px solid color-mix(in srgb, var(--accent) 55%, transparent); border-radius: var(--radius-sm); padding: 13px 15px; color: var(--text); font-size: 14px; }
.xref-list { display: flex; flex-wrap: wrap; gap: 6px; }
.xref-chip { font-size: 12px; padding: 5px 11px; border-radius: 999px; background: var(--bg-elev-2); border: 1px solid var(--border-soft); transition: border-color .15s, color .15s, background .15s; }
.xref-chip:hover { border-color: var(--accent); color: var(--accent-text); background: var(--accent-dim); }
.muscle-diagram { margin-top: 16px; background: var(--bg-elev-2); border: 1px solid var(--border-soft); border-radius: var(--radius); padding: 16px; }
.muscle-diagram .figures { display: flex; justify-content: center; gap: 16px; }
.muscle-diagram .figures svg { width: 120px; height: 320px; filter: drop-shadow(0 4px 14px rgba(0,0,0,.2)); }
.muscle-diagram .figures svg path[data-region] { cursor: pointer; transition: opacity .1s; }
.muscle-diagram .figures svg path[data-region]:hover { opacity: .8; }
.muscle-diagram .view-label { text-align: center; font-size: 10px; color: var(--text-faint); margin-top: 6px; text-transform: uppercase; letter-spacing: .6px; font-weight: 600; }
.muscle-diagram .hover-panel {
  margin-top: 12px; min-height: 44px; background: var(--bg-elev); border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm); padding: 11px 13px; font-size: 12px; color: var(--text-dim);
}
.muscle-diagram .hover-panel strong { color: var(--text); display: block; margin-bottom: 4px; font-size: 12.5px; }
.muscle-diagram .hover-panel ul { margin: 0; padding-left: 16px; }
.muscle-diagram .hover-panel .hover-more { margin-top: 4px; color: var(--text-faint); }
.media-slot { border: 1.5px dashed var(--border); border-radius: var(--radius); padding: 26px; text-align: center; color: var(--text-faint); font-size: 13px; transition: border-color .15s; }
.media-slot:hover { border-color: var(--accent); }
.media-slot video, .media-slot img { max-width: 100%; border-radius: var(--radius-sm); }
.assign-box { display:flex; gap:8px; align-items:center; }
.assign-box select { flex:1; padding: 9px 11px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--bg-elev-2); color: var(--text); }

/* ---- theory pages ---- */
.theory-block { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 22px; margin-bottom: 14px; transition: border-color .15s, box-shadow .15s; }
.theory-block:hover { box-shadow: var(--shadow-sm); }
.theory-block h3 { margin: 0 0 6px; font-size: 16.5px; color: var(--accent-text); font-weight: 800; }
.theory-block .num {
  display: inline-flex; align-items: center; justify-content: center; width: 22px; height: 22px;
  border-radius: 7px; background: var(--grad-accent); color: #1a0f08; font-weight: 800; font-size: 11.5px; margin-right: 8px;
}
table.ref-table { width: 100%; border-collapse: collapse; margin-top: 12px; font-size: 13px; }
table.ref-table th, table.ref-table td { text-align: left; padding: 8px 11px; border-bottom: 1px solid var(--border-soft); }
table.ref-table th { color: var(--text-faint); font-weight: 700; font-size: 11px; text-transform: uppercase; letter-spacing: .4px; }
table.ref-table tr:hover td { background: var(--bg-elev-2); }

/* ---- auth / modal generic ---- */
.modal-backdrop { position: fixed; inset: 0; background: rgba(4,8,16,.55); backdrop-filter: blur(3px); display: flex; align-items: center; justify-content: center; z-index: 200; }
.modal-box { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 26px; width: min(380px, 92vw); box-shadow: var(--shadow); }
.modal-box h3 { margin: 0 0 16px; font-size: 18px; font-weight: 800; }
.field { margin-bottom: 13px; }
.field label { display: block; font-size: 12.5px; color: var(--text-faint); margin-bottom: 6px; font-weight: 600; }
.field input, .field select {
  width: 100%; padding: 10px 12px; border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: var(--bg-elev-2); color: var(--text); transition: border-color .15s, box-shadow .15s; outline: none;
}
.field input:focus, .field select:focus { border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-dim); }
.modal-actions { display: flex; gap: 8px; margin-top: 18px; justify-content: flex-end; }
.msg { font-size: 12.5px; margin-top: 8px; }
.msg.err { color: var(--danger); }
.msg.ok { color: var(--ok); }

/* ---- students / assignments ---- */
.student-row { display: flex; justify-content: space-between; align-items: center; padding: 11px 13px; border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 8px; background: var(--bg-elev); transition: border-color .15s; }
.student-row:hover { border-color: var(--accent); }
.student-row .name { font-weight: 700; }
.student-row .meta { font-size: 12px; color: var(--text-faint); }

@media (max-width: 860px) {
  .sidebar { display: none; }
  .detail-panel { width: 100%; }
  .topbar { flex-wrap: wrap; }
  .search-wrap { order: 3; max-width: 100%; }
}