/* =========================================================================
   STEMVithai Founder OS — css/founder.css
   Premium dark admin shell. Independent of the public site's styles.css
   (this surface is never shown to students), but shares the brand green
   and Plus Jakarta Sans typeface for family resemblance.
   ========================================================================= */

:root {
  --fos-bg:        #0a0f0a;
  --fos-bg-soft:   #0d140d;
  --fos-card:      #111811;
  --fos-card-hi:   #141f14;
  --fos-border:    #1a2e1a;
  --fos-border-hi: #224222;
  --fos-text:      #eaf1ea;
  --fos-text-soft: #8fa394;
  --fos-text-dim:  #5f7264;
  --fos-accent:    #22c55e;
  --fos-accent-dim:#16a34a;
  --fos-warn:      #eab308;
  --fos-crit:      #ef4444;
  --fos-info:      #38bdf8;
  --fos-radius:    14px;
  --fos-radius-sm: 9px;
  --fos-shadow:    0 12px 32px -12px rgba(0,0,0,0.55);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--fos-bg);
  color: var(--fos-text);
  font-family: 'Plus Jakarta Sans', -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ---------- Shell layout ---------- */
.fos-shell {
  display: grid;
  grid-template-columns: 248px 1fr;
  min-height: 100vh;
}

.fos-sidebar {
  background: var(--fos-bg-soft);
  border-right: 1px solid var(--fos-border);
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  gap: .25rem;
}

.fos-logo {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-weight: 800;
  font-size: 1.05rem;
  padding: 0 .5rem .5rem;
  margin-bottom: .75rem;
  border-bottom: 1px solid var(--fos-border);
}
.fos-logo-mark { font-size: 1.3rem; }
.fos-logo .accent { color: var(--fos-accent); }

.fos-nav-link {
  display: flex;
  align-items: center;
  gap: .65rem;
  padding: .65rem .75rem;
  border-radius: var(--fos-radius-sm);
  color: var(--fos-text-soft);
  font-size: .9rem;
  font-weight: 600;
  transition: background .15s, color .15s;
}
.fos-nav-link:hover { background: var(--fos-card); color: var(--fos-text); }
.fos-nav-link.active { background: rgba(34,197,94,0.12); color: var(--fos-accent); }

.fos-nav-spacer { flex: 1; }

.fos-nav-link--logout {
  cursor: pointer;
  border-top: 1px solid var(--fos-border);
  margin-top: .5rem;
  padding-top: .9rem;
}

.fos-main { padding: 1.75rem 2.25rem 3rem; max-width: 1400px; }

/* ---------- Top bar ---------- */
.fos-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.75rem;
  gap: 1rem;
  flex-wrap: wrap;
}
.fos-topbar-left h1 { font-size: 1.4rem; margin: 0 0 .2rem; }
.fos-topbar-left .fos-sub { color: var(--fos-text-soft); font-size: .85rem; }

.fos-topbar-right { display: flex; align-items: center; gap: 1rem; }

.fos-health {
  display: flex; align-items: center; gap: .4rem;
  font-size: .8rem; color: var(--fos-text-soft);
}
.fos-health-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--fos-accent);
  box-shadow: 0 0 0 3px rgba(34,197,94,0.18);
}
.fos-health-dot.warn { background: var(--fos-warn); box-shadow: 0 0 0 3px rgba(234,179,8,0.18); }
.fos-health-dot.crit { background: var(--fos-crit); box-shadow: 0 0 0 3px rgba(239,68,68,0.18); }

.fos-bell {
  position: relative;
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  background: var(--fos-card);
  border: 1px solid var(--fos-border);
  border-radius: 50%;
  cursor: pointer;
}
.fos-bell-count {
  position: absolute; top: -4px; right: -4px;
  background: var(--fos-crit); color: #fff;
  font-size: .65rem; font-weight: 700;
  width: 16px; height: 16px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
}

.fos-role-badge {
  font-size: .7rem; font-weight: 700; letter-spacing: .03em;
  text-transform: uppercase;
  padding: .3rem .6rem;
  border-radius: var(--fos-radius-sm);
  background: rgba(34,197,94,0.12);
  color: var(--fos-accent);
}

/* ---------- Cards / KPIs ---------- */
.fos-kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.25rem;
}
@media (max-width: 1100px) { .fos-kpi-grid { grid-template-columns: repeat(2, 1fr); } }

.fos-card {
  background: var(--fos-card);
  border: 1px solid var(--fos-border);
  border-radius: var(--fos-radius);
  padding: 1.1rem 1.25rem;
}

.fos-kpi-label {
  font-size: .78rem; color: var(--fos-text-soft); font-weight: 600;
  margin-bottom: .4rem; display: flex; align-items: center; gap: .4rem;
}
.fos-kpi-value { font-size: 1.7rem; font-weight: 800; line-height: 1; }
.fos-kpi-delta { font-size: .75rem; margin-top: .35rem; font-weight: 600; }
.fos-kpi-delta.up { color: var(--fos-accent); }
.fos-kpi-delta.down { color: var(--fos-crit); }

/* ---------- Section headers ---------- */
.fos-section-title {
  font-size: 1.05rem; font-weight: 700;
  margin: 1.75rem 0 .9rem;
  display: flex; align-items: center; justify-content: space-between;
}

/* ---------- Daily brief ---------- */
.fos-brief {
  background: linear-gradient(135deg, rgba(34,197,94,0.10), rgba(34,197,94,0.02));
  border: 1px solid var(--fos-border-hi);
  border-radius: var(--fos-radius);
  padding: 1.25rem 1.4rem;
  font-size: .9rem;
  line-height: 1.7;
}
.fos-brief strong { color: var(--fos-accent); }

/* ---------- Charts grid ---------- */
.fos-chart-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 1rem;
}
.fos-chart-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}
@media (max-width: 1100px) { .fos-chart-grid, .fos-chart-grid-2 { grid-template-columns: 1fr; } }
.fos-chart-card { height: 320px; display: flex; flex-direction: column; }
.fos-chart-card h3 { font-size: .9rem; margin: 0 0 .8rem; color: var(--fos-text-soft); }
.fos-chart-card canvas { flex: 1; max-height: 100%; }

/* ---------- Tables ---------- */
.fos-table-wrap { overflow-x: auto; }
.fos-table { width: 100%; border-collapse: collapse; font-size: .85rem; }
.fos-table th {
  text-align: left; color: var(--fos-text-soft); font-weight: 600;
  font-size: .75rem; text-transform: uppercase; letter-spacing: .03em;
  padding: .5rem .75rem; border-bottom: 1px solid var(--fos-border);
}
.fos-table td {
  padding: .65rem .75rem; border-bottom: 1px solid var(--fos-border);
  color: var(--fos-text);
}
.fos-table tr:last-child td { border-bottom: none; }
.fos-table-empty { color: var(--fos-text-dim); text-align: center; padding: 1.5rem; }

.fos-pill {
  display: inline-block; padding: .15rem .55rem; border-radius: 100px;
  font-size: .72rem; font-weight: 600;
  background: rgba(34,197,94,0.12); color: var(--fos-accent);
}

/* ---------- Recommendations / Alerts ---------- */
.fos-rec, .fos-alert {
  display: flex; gap: .75rem; align-items: flex-start;
  padding: .9rem 1rem; border-radius: var(--fos-radius-sm);
  background: var(--fos-card); border: 1px solid var(--fos-border);
  margin-bottom: .6rem; font-size: .85rem;
}
.fos-rec-icon { font-size: 1.1rem; }
.fos-alert-tag {
  font-size: .65rem; font-weight: 800; letter-spacing: .03em;
  padding: .2rem .5rem; border-radius: 5px; flex-shrink: 0;
  text-transform: uppercase;
}
.fos-alert-tag.info { background: rgba(56,189,248,0.15); color: var(--fos-info); }
.fos-alert-tag.warning { background: rgba(234,179,8,0.15); color: var(--fos-warn); }
.fos-alert-tag.critical { background: rgba(239,68,68,0.15); color: var(--fos-crit); }
.fos-alert-body { flex: 1; }
.fos-alert-title { font-weight: 700; margin-bottom: .15rem; }
.fos-alert-desc { color: var(--fos-text-soft); font-size: .8rem; }
.fos-alert-time { color: var(--fos-text-dim); font-size: .72rem; margin-top: .25rem; }
.fos-alert-dismiss {
  background: none; border: none; color: var(--fos-text-dim); cursor: pointer;
  font-size: .85rem; padding: .2rem;
}
.fos-alert-dismiss:hover { color: var(--fos-text); }

/* ---------- Buttons / forms ---------- */
.fos-btn {
  display: inline-flex; align-items: center; gap: .4rem;
  background: var(--fos-accent); color: #06170a;
  border: none; padding: .6rem 1.1rem; border-radius: var(--fos-radius-sm);
  font-weight: 700; font-size: .85rem; cursor: pointer;
  transition: filter .15s;
}
.fos-btn:hover { filter: brightness(1.08); }
.fos-btn:disabled { opacity: .5; cursor: not-allowed; }
.fos-btn--ghost {
  background: transparent; color: var(--fos-text); border: 1px solid var(--fos-border-hi);
}
.fos-btn--danger { background: var(--fos-crit); color: #fff; }

.fos-input, .fos-select, .fos-textarea {
  width: 100%; background: var(--fos-bg-soft); border: 1px solid var(--fos-border-hi);
  color: var(--fos-text); border-radius: var(--fos-radius-sm);
  padding: .6rem .75rem; font-family: inherit; font-size: .88rem;
}
.fos-textarea { resize: vertical; min-height: 220px; line-height: 1.6; }
.fos-input:focus, .fos-select:focus, .fos-textarea:focus {
  outline: none; border-color: var(--fos-accent);
}

/* ---------- Login page ---------- */
.fos-login-shell {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: radial-gradient(circle at 50% 0%, rgba(34,197,94,0.08), transparent 60%), var(--fos-bg);
}
.fos-login-card {
  width: 100%; max-width: 380px; background: var(--fos-card);
  border: 1px solid var(--fos-border); border-radius: var(--fos-radius);
  padding: 2.25rem 2rem; box-shadow: var(--fos-shadow);
}
.fos-login-logo { text-align: center; font-weight: 800; font-size: 1.2rem; margin-bottom: .25rem; }
.fos-login-sub { text-align: center; color: var(--fos-text-soft); font-size: .82rem; margin-bottom: 1.6rem; }
.fos-field { margin-bottom: 1rem; }
.fos-field label { display: block; font-size: .78rem; font-weight: 600; color: var(--fos-text-soft); margin-bottom: .35rem; }
.fos-login-error {
  display: none; background: rgba(239,68,68,0.12); border: 1px solid rgba(239,68,68,0.3);
  color: #fca5a5; font-size: .82rem; padding: .6rem .75rem; border-radius: var(--fos-radius-sm);
  margin-bottom: 1rem;
}
.fos-login-error.show { display: block; }

/* ---------- Notes page ---------- */
.fos-notes-shell { display: grid; grid-template-columns: 320px 1fr; gap: 1.25rem; }
@media (max-width: 900px) { .fos-notes-shell { grid-template-columns: 1fr; } }
.fos-notes-filters { display: flex; gap: .4rem; flex-wrap: wrap; margin-bottom: .9rem; }
.fos-filter-tab {
  font-size: .76rem; font-weight: 600; padding: .35rem .7rem; border-radius: 100px;
  border: 1px solid var(--fos-border-hi); color: var(--fos-text-soft); cursor: pointer;
  background: transparent;
}
.fos-filter-tab.active { background: var(--fos-accent); color: #06170a; border-color: var(--fos-accent); }
.fos-note-card {
  background: var(--fos-card); border: 1px solid var(--fos-border);
  border-radius: var(--fos-radius-sm); padding: .85rem 1rem; margin-bottom: .55rem;
  cursor: pointer;
}
.fos-note-card:hover, .fos-note-card.active { border-color: var(--fos-accent); }
.fos-note-card-title { font-weight: 700; font-size: .9rem; margin-bottom: .25rem; }
.fos-note-card-preview { color: var(--fos-text-soft); font-size: .78rem; }
.fos-note-card-meta { color: var(--fos-text-dim); font-size: .7rem; margin-top: .4rem; }

.fos-empty-state { text-align: center; padding: 3rem 1rem; color: var(--fos-text-dim); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--fos-border-hi); border-radius: 6px; }