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

:root {
  --bg: #f4f3ef;
  --surface: #ffffff;
  --surface2: #f8f7f4;
  --border: rgba(0,0,0,0.08);
  --border-strong: rgba(0,0,0,0.15);
  --text: #1a1a18;
  --text-2: #6b6b68;
  --text-3: #9b9b98;
  --blue: #185FA5;
  --blue-bg: #e8f0fb;
  --blue-text: #0c447c;
  --green: #2e7d32;
  --green-bg: #eaf3de;
  --green-text: #27500a;
  --amber: #8a5a0a;
  --amber-bg: #faeeda;
  --amber-text: #633806;
  --red: #a32d2d;
  --red-bg: #fcebeb;
  --red-text: #791f1f;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --font: 'DM Sans', sans-serif;
  --mono: 'DM Mono', monospace;
}

body { font-family: var(--font); background: var(--bg); color: var(--text); font-size: 14px; line-height: 1.5; height: 100vh; overflow: hidden; }

#app { display: flex; flex-direction: column; height: 100vh; }

/* ── Topbar ── */
.topbar { display: flex; align-items: center; gap: 16px; padding: 0 20px; height: 56px; background: var(--surface); border-bottom: 1px solid var(--border); flex-shrink: 0; }
.topbar-brand { display: flex; align-items: center; gap: 8px; font-weight: 500; font-size: 15px; color: var(--text); white-space: nowrap; }
.topbar-brand i { font-size: 20px; color: var(--blue); }
.topbar-controls { display: flex; align-items: center; gap: 12px; margin-left: 24px; }
.select-group { display: flex; align-items: center; gap: 6px; }
.select-group label { font-size: 12px; color: var(--text-2); white-space: nowrap; }
.select-group select { font-family: var(--font); font-size: 13px; padding: 5px 28px 5px 10px; border-radius: var(--radius-sm); border: 1px solid var(--border-strong); background: var(--surface2); color: var(--text); cursor: pointer; appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b6b68' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 8px center; }
.select-group select:focus { outline: none; border-color: var(--blue); }
.topbar-actions { display: flex; gap: 8px; margin-left: auto; }

/* ── Boutons ── */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 7px 14px; border-radius: var(--radius-sm); border: 1px solid var(--border-strong); background: transparent; color: var(--text); font-family: var(--font); font-size: 13px; cursor: pointer; transition: all .15s; white-space: nowrap; }
.btn:hover { background: var(--surface2); }
.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: .4; cursor: not-allowed; }
.btn-primary { background: var(--blue); color: #fff; border-color: transparent; }
.btn-primary:hover { background: var(--blue-text); }
.btn-success { background: var(--green-bg); color: var(--green-text); border-color: transparent; }
.btn-success:hover { background: #c0dd97; }
.btn-warning { background: var(--amber-bg); color: var(--amber-text); border-color: transparent; }
.btn-warning:hover { background: #fac775; }
.btn-danger { background: var(--red-bg); color: var(--red-text); border-color: transparent; }
.btn-danger:hover { background: #f7c1c1; }
.btn-ghost { background: transparent; color: var(--text-2); }
.btn-ghost:hover { background: var(--surface2); color: var(--text); }
.btn-sm { padding: 4px 10px; font-size: 12px; }

/* ── Layout ── */
.layout { display: flex; flex: 1; overflow: hidden; }

/* ── Sidebar ── */
.sidebar { width: 260px; flex-shrink: 0; background: var(--surface); border-right: 1px solid var(--border); display: flex; flex-direction: column; overflow: hidden; }
.sidebar-header { padding: 12px 16px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; flex-shrink: 0; }
.sidebar-header span { font-size: 12px; font-weight: 500; color: var(--text-2); text-transform: uppercase; letter-spacing: .06em; }
.sidebar-count { background: var(--surface2); border-radius: 999px; padding: 1px 8px; font-size: 11px; color: var(--text-3); font-family: var(--mono); }
.chap-list { flex: 1; overflow-y: auto; padding: 8px; display: flex; flex-direction: column; gap: 2px; }
.chap-item { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: var(--radius-sm); cursor: pointer; transition: all .12s; color: var(--text-2); border: 1px solid transparent; }
.chap-item:hover { background: var(--surface2); color: var(--text); }
.chap-item.active { background: var(--blue-bg); color: var(--blue-text); border-color: rgba(24,95,165,0.15); }
.chap-item.done { color: var(--green); }
.chap-item.done .chap-icon { color: var(--green); }
.chap-num { font-family: var(--mono); font-size: 11px; min-width: 18px; color: var(--text-3); }
.chap-item.active .chap-num { color: var(--blue); }
.chap-content { flex: 1; min-width: 0; }
.chap-title { font-size: 12px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chap-bar { height: 2px; background: var(--border); border-radius: 1px; margin-top: 4px; overflow: hidden; }
.chap-bar-fill { height: 100%; border-radius: 1px; background: currentColor; transition: width .3s; }
.chap-icon { font-size: 14px; flex-shrink: 0; }
.empty-state { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; padding: 40px 20px; color: var(--text-3); text-align: center; }
.empty-state i { font-size: 28px; }
.empty-state p { font-size: 13px; }

/* ── Main ── */
.main { flex: 1; overflow-y: auto; padding: 20px; }

/* ── Welcome ── */
.welcome-screen { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: calc(100vh - 140px); text-align: center; gap: 12px; }
.welcome-icon { width: 64px; height: 64px; border-radius: 50%; background: var(--blue-bg); display: flex; align-items: center; justify-content: center; margin-bottom: 8px; }
.welcome-icon i { font-size: 30px; color: var(--blue); }
.welcome-screen h1 { font-size: 22px; font-weight: 500; }
.welcome-screen p { color: var(--text-2); font-size: 14px; }
.welcome-classes { display: flex; gap: 8px; margin-top: 16px; flex-wrap: wrap; justify-content: center; }
.welcome-pill { padding: 6px 16px; border-radius: 999px; border: 1px solid var(--border-strong); background: var(--surface); font-size: 13px; cursor: pointer; transition: all .15s; }
.welcome-pill:hover { background: var(--blue-bg); color: var(--blue-text); border-color: transparent; }

/* ── Dashboard ── */
.dashboard { display: flex; flex-direction: column; gap: 16px; }

/* ── Metrics ── */
.metrics-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.metric { background: var(--surface); border-radius: var(--radius); border: 1px solid var(--border); padding: 14px 16px; }
.metric-label { font-size: 11px; color: var(--text-2); text-transform: uppercase; letter-spacing: .05em; margin-bottom: 6px; }
.metric-value { font-size: 24px; font-weight: 300; color: var(--text); font-family: var(--mono); }
.metric-sub { font-size: 11px; color: var(--text-3); margin-top: 4px; }

/* ── Panels ── */
.panel { background: var(--surface); border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden; }
.panel-header { display: flex; align-items: center; gap: 8px; padding: 10px 16px; border-bottom: 1px solid var(--border); background: var(--surface2); }
.panel-header i { font-size: 16px; color: var(--text-2); }
.panel-title { font-size: 13px; font-weight: 500; color: var(--text-2); }
.close-btn { margin-left: auto; background: none; border: none; cursor: pointer; color: var(--text-3); font-size: 16px; display: flex; align-items: center; padding: 2px; border-radius: 4px; }
.close-btn:hover { color: var(--text); background: var(--border); }

.content-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }

/* ── Session panel ── */
.sess-badge { font-size: 11px; padding: 2px 10px; border-radius: 999px; background: var(--blue-bg); color: var(--blue-text); margin-left: 4px; }
.badge-groupe { background: var(--amber-bg); color: var(--amber-text); }
.session-body { padding: 16px; display: flex; flex-direction: column; gap: 14px; }

.slide-block { background: var(--surface2); border-radius: var(--radius-sm); padding: 14px; display: flex; flex-direction: column; gap: 12px; border: 1px solid var(--border); }
.slide-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.slide-label { font-size: 12px; color: var(--text-2); display: flex; align-items: center; gap: 5px; min-width: 90px; }
.slide-inputs { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.inp-grp { display: flex; flex-direction: column; gap: 3px; }
.inp-grp label { font-size: 10px; color: var(--text-3); text-transform: uppercase; letter-spacing: .04em; }
.inp-grp input { width: 72px; font-family: var(--mono); font-size: 14px; font-weight: 500; text-align: center; padding: 5px 8px; border-radius: var(--radius-sm); border: 1px solid var(--border-strong); background: var(--surface); color: var(--text); }
.inp-grp input:focus { outline: none; border-color: var(--blue); }
.arr { color: var(--text-3); font-size: 16px; margin-top: 14px; }
.prog-wrap { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.prog-bar { width: 100px; height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; }
.prog-fill { height: 100%; background: var(--blue); border-radius: 3px; transition: width .3s; width: 0; }
.prog-pct { font-family: var(--mono); font-size: 13px; font-weight: 500; color: var(--blue); min-width: 38px; text-align: right; }
.ecart-info { font-size: 12px; color: var(--text-3); margin-left: auto; font-family: var(--mono); }
.ecart-pos { color: var(--red); }
.ecart-neg { color: var(--green); }

.pptx-row { display: flex; align-items: center; gap: 10px; padding: 10px 12px; background: var(--surface2); border-radius: var(--radius-sm); border: 1px solid var(--border); }
.pptx-row i { font-size: 18px; color: var(--text-2); flex-shrink: 0; }
.pptx-name { flex: 1; font-size: 13px; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.action-row { display: flex; gap: 8px; flex-wrap: wrap; }

/* ── Exercices ── */
.side-panel .panel-header { }
.exo-list { padding: 12px; display: flex; flex-direction: column; gap: 8px; }
.exo-item { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--surface2); cursor: pointer; transition: all .15s; }
.exo-item:hover { border-color: var(--blue); background: var(--blue-bg); }
.exo-item.used { opacity: .45; cursor: default; }
.exo-item.used:hover { border-color: var(--border); background: var(--surface2); }
.exo-icon { font-size: 18px; color: var(--text-2); flex-shrink: 0; }
.exo-info { flex: 1; min-width: 0; }
.exo-name { font-size: 13px; font-weight: 500; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.exo-meta { font-size: 11px; color: var(--text-3); margin-top: 2px; }
.exo-badge { font-size: 11px; padding: 2px 8px; border-radius: 999px; flex-shrink: 0; }
.badge-ok { background: var(--green-bg); color: var(--green-text); }
.badge-used { background: var(--surface2); color: var(--text-3); border: 1px solid var(--border); }

/* ── Interro ── */
.interro-body { padding: 12px; display: flex; flex-direction: column; gap: 12px; }
.interro-list { display: flex; flex-direction: column; gap: 6px; }
.interro-item { display: flex; align-items: center; gap: 8px; padding: 8px 12px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--surface2); cursor: pointer; transition: all .15s; font-size: 13px; }
.interro-item:hover { border-color: var(--red); background: var(--red-bg); }
.interro-item.selected { background: var(--red-bg); border-color: var(--red); color: var(--red-text); }
.interro-form { display: flex; flex-direction: column; gap: 10px; padding-top: 10px; border-top: 1px solid var(--border); }
.form-row { display: flex; align-items: center; gap: 10px; }
.form-row label { font-size: 12px; color: var(--text-2); min-width: 80px; }
.form-row input { font-family: var(--font); font-size: 13px; padding: 5px 10px; border-radius: var(--radius-sm); border: 1px solid var(--border-strong); background: var(--surface); color: var(--text); flex: 1; }
.form-row input:focus { outline: none; border-color: var(--blue); }

/* ── History ── */
.history-panel { }
.history-count { margin-left: auto; font-family: var(--mono); font-size: 12px; color: var(--text-3); }
.history-wrap { overflow-x: auto; }
.history-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.history-table th { padding: 8px 14px; text-align: left; font-size: 11px; font-weight: 500; color: var(--text-3); text-transform: uppercase; letter-spacing: .05em; border-bottom: 1px solid var(--border); background: var(--surface2); white-space: nowrap; }
.history-table td { padding: 9px 14px; border-bottom: 1px solid var(--border); color: var(--text); vertical-align: middle; }
.history-table tr:last-child td { border-bottom: none; }
.history-table tr:hover td { background: var(--surface2); }
.empty-row { text-align: center; color: var(--text-3); padding: 24px !important; }
.h-badge { display: inline-flex; align-items: center; font-size: 11px; padding: 2px 8px; border-radius: 999px; }
.h-cours { background: var(--blue-bg); color: var(--blue-text); }
.h-exercice { background: var(--amber-bg); color: var(--amber-text); }
.h-interro { background: var(--red-bg); color: var(--red-text); }
.h-fait { background: var(--green-bg); color: var(--green-text); }
.h-prevu { background: var(--surface2); color: var(--text-3); border: 1px solid var(--border); }
.h-reporte { background: var(--red-bg); color: var(--red-text); }
.edit-link { font-size: 14px; color: var(--text-3); cursor: pointer; padding: 4px; border-radius: 4px; }
.edit-link:hover { color: var(--blue); background: var(--blue-bg); }

/* ── Toast ── */
.toast { position: fixed; bottom: 24px; right: 24px; background: var(--text); color: #fff; padding: 10px 18px; border-radius: var(--radius); font-size: 13px; opacity: 0; transform: translateY(8px); transition: all .25s; pointer-events: none; z-index: 999; }
.toast.show { opacity: 1; transform: translateY(0); }
.toast.success { background: var(--green); }
.toast.error { background: var(--red); }

/* ── Loading ── */
.loading { display: flex; align-items: center; gap: 8px; padding: 20px; color: var(--text-3); font-size: 13px; justify-content: center; }
@keyframes spin { to { transform: rotate(360deg); } }
.spin { display: inline-block; animation: spin .8s linear infinite; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 3px; }

.exo-actions { display: flex; gap: 6px; align-items: center; flex-shrink: 0; margin-left: auto; }
.exo-item { cursor: default; }
.exo-item.used .exo-actions { opacity: .6; }