/* RIVERSIDE · ACADÉMIE DE LANGUES - ADMIN (azul marino + rojo) */
:root {
    --c-primary: #16294D;
    --c-primary-dark: #0F1D38;
    --c-primary-light: #EAEEF6;
    --c-accent: #C8102E;
    --c-accent-dark: #A20D24;
    --c-dark: #0E1A30;
    --c-bg: #F7F8FB;
    --c-surface: #FFFFFF;
    --c-text: #1F2937;
    --c-text-soft: #6B7280;
    --c-text-muted: #9CA3AF;
    --c-border: #E5E7EB;
    --c-warning: #F59E0B;
    --c-warning-bg: #FEF3C7;
    --c-success: #10B981;
    --c-success-bg: #D1FAE5;
    --c-danger: #EF4444;
    --c-danger-bg: #FEE2E2;
    --c-info: #3B82F6;
    --c-info-bg: #DBEAFE;
}

* { margin:0; padding:0; box-sizing:border-box; }
body { font-family: 'Inter', system-ui, sans-serif; background: var(--c-bg); color: var(--c-text); font-size: 14px; }
a { color: inherit; text-decoration: none; }
h1,h2,h3,h4 { font-family: 'Plus Jakarta Sans', sans-serif; color: var(--c-dark); }

.app { display: flex; min-height: 100vh; }
.sidebar {
    width: 240px;
    background: linear-gradient(180deg, var(--c-dark) 0%, #111827 100%);
    color: white;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
}
.sidebar-head { padding: 22px 22px 18px; border-bottom: 1px solid rgba(255,255,255,0.08); }
.sidebar-head h1 { color: white; font-size: 17px; font-weight: 800; display: flex; align-items: center; gap: 10px; }
.sidebar-head .icon { width: 32px; height: 32px; background: linear-gradient(135deg,var(--c-primary),var(--c-accent)); border-radius: 9px; display:flex; align-items:center; justify-content:center; font-size: 18px; }
.sidebar-head small { color: rgba(255,255,255,0.5); font-size: 10.5px; margin-top: 4px; display: block; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 600; }
.sidebar-nav { list-style: none; padding: 18px 12px; flex: 1; overflow-y: auto; }
.sidebar-nav li { margin-bottom: 3px; }
.sidebar-nav a { display: flex; align-items: center; gap: 11px; padding: 10px 12px; border-radius: 9px; font-size: 13.5px; font-weight: 600; color: rgba(255,255,255,0.75); transition: 0.2s; }
.sidebar-nav a:hover { background: rgba(255,255,255,0.06); color: white; }
.sidebar-nav a.active { background: var(--c-primary); color: white; box-shadow: 0 4px 14px rgba(22, 41, 77,0.3); }
.sidebar-nav a .badge { margin-left: auto; background: rgba(255,255,255,0.18); padding: 1px 7px; border-radius: 999px; font-size: 10.5px; font-weight: 700; }
.sidebar-nav-section { color: rgba(255,255,255,0.35); font-size: 10px; font-weight: 800; text-transform: uppercase; letter-spacing: 0.08em; padding: 14px 12px 6px; }
.sidebar-foot { padding: 14px 18px; border-top: 1px solid rgba(255,255,255,0.08); font-size: 12px; color: rgba(255,255,255,0.5); }
.sidebar-foot a { color: var(--c-accent); }

.main { flex: 1; min-width: 0; }
.topbar { background: white; padding: 14px 28px; border-bottom: 1px solid var(--c-border); display: flex; align-items: center; justify-content: space-between; gap: 16px; position: sticky; top: 0; z-index: 10; }
.topbar h1 { font-size: 18px; }
.topbar-actions { display: flex; align-items: center; gap: 10px; }
.topbar-user { display: flex; align-items: center; gap: 8px; padding: 6px 10px 6px 6px; background: var(--c-bg); border-radius: 999px; font-size: 12.5px; font-weight: 600; }
.topbar-user .avatar { width: 28px; height: 28px; background: linear-gradient(135deg,var(--c-primary),var(--c-accent)); color: white; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 13px; }
.content { padding: 28px; }

.card { background: white; border: 1px solid var(--c-border); border-radius: 14px; overflow: hidden; margin-bottom: 18px; }
.card-head { padding: 18px 22px; border-bottom: 1px solid var(--c-border); display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.card-head h2, .card-head h3 { font-size: 15.5px; font-weight: 700; }
.card-body { padding: 22px; }
.card-body.flush { padding: 0; }

.kpi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 24px; }
.kpi { background: white; padding: 20px 22px; border-radius: 14px; border: 1px solid var(--c-border); position: relative; overflow: hidden; }
.kpi-label { font-size: 11.5px; color: var(--c-text-muted); text-transform: uppercase; letter-spacing: 0.06em; font-weight: 700; margin-bottom: 8px; }
.kpi-value { font-family: 'Plus Jakarta Sans', sans-serif; font-size: 28px; font-weight: 800; color: var(--c-dark); line-height: 1; }
.kpi-meta { font-size: 12px; color: var(--c-text-soft); margin-top: 6px; }
.kpi-icon { position: absolute; top: 16px; right: 16px; width: 36px; height: 36px; background: var(--c-primary-light); color: var(--c-primary); border-radius: 10px; display: flex; align-items: center; justify-content: center; }

.table-wrap { overflow-x: auto; }
table.t { width: 100%; border-collapse: collapse; }
.t th, .t td { padding: 12px 18px; text-align: left; border-bottom: 1px solid var(--c-border); font-size: 13px; }
.t th { background: var(--c-bg); font-weight: 700; font-size: 11.5px; color: var(--c-text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.t tr:hover td { background: rgba(22, 41, 77,0.03); }
.t .cell-strong { font-weight: 700; color: var(--c-dark); }
.t .cell-soft { color: var(--c-text-soft); font-size: 12px; margin-top: 2px; }
.t a.linkish { color: var(--c-primary); font-weight: 600; }
.t a.linkish:hover { color: var(--c-primary-dark); }

.badge { display: inline-block; padding: 3px 9px; border-radius: 999px; font-size: 10.5px; font-weight: 800; text-transform: uppercase; letter-spacing: 0.04em; }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--c-border); margin-bottom: 20px; flex-wrap: wrap; }
.tabs a { padding: 10px 16px; font-size: 13px; font-weight: 600; color: var(--c-text-muted); border-bottom: 2px solid transparent; margin-bottom: -1px; }
.tabs a.active { color: var(--c-dark); border-color: var(--c-primary); }
.tabs a .num { background: var(--c-bg); padding: 1px 7px; border-radius: 999px; font-size: 10.5px; margin-left: 4px; }
.tabs a.active .num { background: var(--c-primary); color: white; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-row-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
@media (max-width: 700px) { .form-row, .form-row-3 { grid-template-columns: 1fr; } }
.form-group { margin-bottom: 14px; }
.form-label { display: block; font-size: 12px; font-weight: 700; color: var(--c-dark); margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.04em; }
.form-control { width: 100%; padding: 10px 12px; border: 1.5px solid var(--c-border); border-radius: 9px; font-family: inherit; font-size: 13.5px; background: white; transition: 0.2s; }
.form-control:focus { outline: none; border-color: var(--c-primary); box-shadow: 0 0 0 3px rgba(22, 41, 77,0.1); }
textarea.form-control { resize: vertical; min-height: 70px; }
.form-help { font-size: 11.5px; color: var(--c-text-muted); margin-top: 4px; }

.btn { display: inline-flex; align-items: center; gap: 6px; padding: 10px 18px; border-radius: 999px; font-weight: 700; font-size: 13px; border: none; cursor: pointer; transition: 0.2s; font-family: inherit; text-decoration: none; }
.btn-primary { background: var(--c-primary); color: white; }
.btn-primary:hover { background: var(--c-primary-dark); }
.btn-accent { background: var(--c-accent); color: var(--c-dark); }
.btn-outline { background: white; color: var(--c-dark); border: 1.5px solid var(--c-border); }
.btn-outline:hover { border-color: var(--c-primary); color: var(--c-primary); }
.btn-success { background: var(--c-success); color: white; }
.btn-danger { background: var(--c-danger); color: white; }
.btn-sm { padding: 6px 12px; font-size: 11.5px; }
.btn-icon { width: 32px; height: 32px; padding: 0; justify-content: center; }

.toolbar { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; flex-wrap: wrap; }
.toolbar input[type="text"], .toolbar input[type="search"], .toolbar select, .toolbar input[type="date"] { padding: 9px 12px; border: 1.5px solid var(--c-border); border-radius: 9px; background: white; font-family: inherit; font-size: 13px; flex: 1; min-width: 180px; }

/* LOGIN */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-accent-dark) 100%); padding: 20px; }
.login-card { background: white; border-radius: 20px; padding: 40px 36px; max-width: 400px; width: 100%; box-shadow: 0 20px 60px rgba(0,0,0,0.2); }
.login-logo { width: 60px; height: 60px; margin: 0 auto 16px; background: linear-gradient(135deg, var(--c-primary), var(--c-accent)); border-radius: 16px; display: flex; align-items: center; justify-content: center; color: white; font-size: 26px; }
.login-card h1 { text-align: center; font-size: 22px; margin-bottom: 6px; }
.login-card p { text-align: center; color: var(--c-text-soft); font-size: 13.5px; margin-bottom: 26px; }

.alert { padding: 12px 14px; border-radius: 10px; font-size: 13px; margin-bottom: 16px; }
.alert-err { background: var(--c-danger-bg); color: var(--c-danger); border-left: 3px solid var(--c-danger); }
.alert-ok { background: var(--c-success-bg); color: var(--c-success); border-left: 3px solid var(--c-success); }
.alert-info { background: var(--c-info-bg); color: var(--c-info); border-left: 3px solid var(--c-info); }

.empty-state { text-align: center; padding: 60px 24px; color: var(--c-text-soft); }
.empty-state .emoji { font-size: 48px; opacity: 0.5; margin-bottom: 12px; }
.empty-state h3 { color: var(--c-dark); font-size: 18px; margin-bottom: 6px; }

/* Progress bar */
.progress { height: 8px; background: var(--c-bg); border-radius: 4px; overflow: hidden; }
.progress > div { height: 100%; background: linear-gradient(90deg, var(--c-primary), var(--c-accent)); border-radius: 4px; transition: width 0.5s; }

/* Pago row */
.pago-row { display: grid; grid-template-columns: 60px 1fr auto auto; gap: 14px; padding: 14px 0; border-bottom: 1px solid var(--c-border); align-items: center; }
.pago-num { width: 48px; height: 48px; background: var(--c-bg); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-weight: 800; color: var(--c-dark); font-family: 'Plus Jakarta Sans'; font-size: 18px; }
.pago-num.is-pagado { background: var(--c-success-bg); color: var(--c-success); }
.pago-num.is-vencido { background: var(--c-danger-bg); color: var(--c-danger); }

@media (max-width: 900px) {
    .app { flex-direction: column; }
    .sidebar { width: 100%; height: auto; position: relative; }
    .sidebar-nav { display: none; }
    .sidebar.open .sidebar-nav { display: block; }
    .content { padding: 20px; }
}

@media print {
    .sidebar, .topbar, .no-print { display: none !important; }
    body { background: white; }
    .content { padding: 0; }
    .card { box-shadow: none; border: none; }
}