/* ==========================================================================
   QBank AI Trainer — Design System
   Base: Bootstrap 5 (no Tailwind). Dark sidebar / light content.
   Type: DM Sans (UI) + DM Mono (data, code, numbers).
   Brand: #00519C
   ========================================================================== */

:root {
  --qb-blue: #00519C;
  --qb-blue-dark: #003A70;
  --qb-blue-light: #E8F1FA;
  --qb-blue-soft: #4A8FC7;

  --qb-sidebar-bg: #0B1D2E;      /* deep navy, near-black */
  --qb-sidebar-bg-active: #12314C;
  --qb-sidebar-text: #A9BBCB;
  --qb-sidebar-text-active: #FFFFFF;
  --qb-sidebar-border: rgba(255, 255, 255, 0.08);

  --qb-bg: #F4F6F9;
  --qb-surface: #FFFFFF;
  --qb-border: #E4E9EF;
  --qb-text: #14212E;
  --qb-text-muted: #6B7A89;

  --qb-success: #1E9E6B;
  --qb-success-bg: #E5F6EE;
  --qb-warning: #C8791A;
  --qb-warning-bg: #FCF0DF;
  --qb-danger: #C5372D;
  --qb-danger-bg: #FBE9E7;

  --qb-radius-sm: 6px;
  --qb-radius: 10px;
  --qb-radius-lg: 14px;

  --qb-shadow: 0 1px 2px rgba(20, 33, 46, 0.04), 0 8px 24px -12px rgba(20, 33, 46, 0.12);
  --qb-shadow-sm: 0 1px 2px rgba(20, 33, 46, 0.06);

  --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'DM Mono', 'SFMono-Regular', Consolas, monospace;
}

body {
  font-family: var(--font-sans);
  background: var(--qb-bg);
  color: var(--qb-text);
  font-size: 15px;
  letter-spacing: -0.01em;
}

.mono, .qb-mono, code, .qb-badge-mono {
  font-family: var(--font-mono);
  letter-spacing: 0;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--qb-text);
}

a { color: var(--qb-blue); text-decoration: none; }
a:hover { color: var(--qb-blue-dark); }

/* ---------- App shell ---------- */
.qb-app {
  display: flex;
  min-height: 100vh;
}

/* ---------- Sidebar (dark) ---------- */
.qb-sidebar {
  width: 264px;
  flex-shrink: 0;
  background: var(--qb-sidebar-bg);
  color: var(--qb-sidebar-text);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 1030;
  transition: transform 0.2s ease;
}

.qb-sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 22px 20px;
  border-bottom: 1px solid var(--qb-sidebar-border);
}

.qb-sidebar-brand .qb-mark {
  width: 38px;
  height: 38px;
  border-radius: var(--qb-radius-sm);
  background: linear-gradient(135deg, var(--qb-blue) 0%, var(--qb-blue-soft) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 14px;
  flex-shrink: 0;
}

.qb-sidebar-brand .qb-brand-title {
  font-weight: 700;
  color: #fff;
  font-size: 15px;
  line-height: 1.2;
}

.qb-sidebar-brand .qb-brand-sub {
  font-size: 11px;
  color: var(--qb-sidebar-text);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.qb-nav {
  flex: 1;
  overflow-y: auto;
  padding: 18px 12px;
}

.qb-nav-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #5D7386;
  padding: 16px 12px 8px;
}

.qb-nav-label:first-child { padding-top: 4px; }

.qb-nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--qb-radius-sm);
  color: var(--qb-sidebar-text);
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 2px;
  border-left: 3px solid transparent;
}

.qb-nav-link i, .qb-nav-link .qb-nav-icon {
  width: 18px;
  text-align: center;
  font-size: 15px;
  flex-shrink: 0;
}

.qb-nav-link:hover {
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
}

.qb-nav-link.active {
  background: var(--qb-sidebar-bg-active);
  color: var(--qb-sidebar-text-active);
  border-left-color: var(--qb-blue-soft);
  font-weight: 700;
}

.qb-sidebar-footer {
  padding: 14px 16px;
  border-top: 1px solid var(--qb-sidebar-border);
  display: flex;
  align-items: center;
  gap: 10px;
}

.qb-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--qb-blue);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 13px;
  flex-shrink: 0;
}

.qb-sidebar-footer .qb-name { color: #fff; font-size: 13.5px; font-weight: 600; }
.qb-sidebar-footer .qb-role { color: var(--qb-sidebar-text); font-size: 11.5px; }

/* ---------- Main / content (light) ---------- */
.qb-main {
  margin-left: 264px;
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.qb-topbar {
  height: 64px;
  background: var(--qb-surface);
  border-bottom: 1px solid var(--qb-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  position: sticky;
  top: 0;
  z-index: 1020;
}

.qb-topbar .qb-eyebrow {
  font-size: 11px;
  font-weight: 700;
  color: var(--qb-blue);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.qb-content { padding: 28px; flex: 1; }

.qb-icon-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--qb-border);
  background: var(--qb-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--qb-text-muted);
}
.qb-icon-btn:hover { background: var(--qb-bg); }

/* ---------- Cards ---------- */
.qb-card {
  background: var(--qb-surface);
  border: 1px solid var(--qb-border);
  border-radius: var(--qb-radius);
  box-shadow: var(--qb-shadow-sm);
}

.qb-card-body { padding: 22px; }

.qb-stat-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
}

.qb-stat-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--qb-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.qb-stat-value {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 500;
  line-height: 1.1;
  color: var(--qb-text);
}

.qb-stat-label { font-size: 12.5px; color: var(--qb-text-muted); margin-top: 2px; }

/* ---------- Buttons (Bootstrap overrides, sharp geometry) ---------- */
.btn {
  border-radius: var(--qb-radius-sm);
  font-weight: 600;
  font-size: 14px;
  padding: 8px 16px;
  letter-spacing: -0.005em;
}

.btn-primary {
  background: var(--qb-blue);
  border-color: var(--qb-blue);
}
.btn-primary:hover, .btn-primary:focus {
  background: var(--qb-blue-dark);
  border-color: var(--qb-blue-dark);
}

.btn-outline-primary {
  color: var(--qb-blue);
  border-color: var(--qb-blue);
}
.btn-outline-primary:hover {
  background: var(--qb-blue);
  border-color: var(--qb-blue);
}

.form-control, .form-select {
  border-radius: var(--qb-radius-sm);
  border-color: var(--qb-border);
  font-size: 14.5px;
  padding: 9px 12px;
}
.form-control:focus, .form-select:focus {
  border-color: var(--qb-blue-soft);
  box-shadow: 0 0 0 3px var(--qb-blue-light);
}

/* ---------- Badges / status pills ---------- */
.qb-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}
.qb-pill-dot { width: 6px; height: 6px; border-radius: 50%; }

.qb-pill-success { background: var(--qb-success-bg); color: var(--qb-success); }
.qb-pill-success .qb-pill-dot { background: var(--qb-success); }

.qb-pill-warning { background: var(--qb-warning-bg); color: var(--qb-warning); }
.qb-pill-warning .qb-pill-dot { background: var(--qb-warning); }

.qb-pill-muted { background: #EEF1F4; color: var(--qb-text-muted); }
.qb-pill-muted .qb-pill-dot { background: #9AA7B2; }

/* ---------- Progress bar ---------- */
.qb-progress {
  height: 8px;
  border-radius: 999px;
  background: var(--qb-border);
  overflow: hidden;
}
.qb-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--qb-blue) 0%, var(--qb-blue-soft) 100%);
  border-radius: 999px;
}

/* ---------- Course / segment list (chat page sidebar) ---------- */
.qb-segment-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 8px;
  border-radius: var(--qb-radius-sm);
}
.qb-segment-item.current { background: var(--qb-blue-light); }
.qb-segment-check {
  width: 20px; height: 20px; border-radius: 50%;
  border: 2px solid var(--qb-border);
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; flex-shrink: 0; margin-top: 1px;
}
.qb-segment-check.done { background: var(--qb-success); border-color: var(--qb-success); color: #fff; }
.qb-segment-check.locked { color: var(--qb-text-muted); }

/* ---------- Chat ---------- */
.qb-chat-window { display: flex; flex-direction: column; gap: 16px; }
.qb-msg { max-width: 72%; padding: 14px 16px; border-radius: var(--qb-radius); font-size: 14.5px; line-height: 1.55; }
.qb-msg-ai { background: var(--qb-surface); border: 1px solid var(--qb-border); align-self: flex-start; }
.qb-msg-user { background: var(--qb-blue); color: #fff; align-self: flex-end; }
.qb-msg pre, .qb-msg code { font-family: var(--font-mono); font-size: 13px; }
.qb-msg-user code { background: rgba(255,255,255,0.15); padding: 1px 5px; border-radius: 4px; }
.qb-msg-ai code { background: var(--qb-bg); padding: 1px 5px; border-radius: 4px; }
.qb-msg-ai p { margin-bottom: 10px; }
.qb-msg-ai p:last-child { margin-bottom: 0; }
.qb-msg-ai ol, .qb-msg-ai ul { padding-left: 20px; margin-bottom: 10px; }
.qb-msg-ai li { margin-bottom: 4px; }
.qb-msg-ai li:last-child { margin-bottom: 0; }

/* ---------- Typing indicator ---------- */
.qb-typing { display: flex; align-items: center; gap: 4px; padding: 16px; }
.qb-typing span {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--qb-text-muted);
  animation: qbTypingBounce 1.2s infinite ease-in-out;
}
.qb-typing span:nth-child(2) { animation-delay: 0.15s; }
.qb-typing span:nth-child(3) { animation-delay: 0.3s; }
@keyframes qbTypingBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-4px); opacity: 1; }
}

/* ---------- Tables ---------- */
.qb-table thead th {
  font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--qb-text-muted); font-weight: 700; border-bottom: 1px solid var(--qb-border);
  padding: 10px 12px;
}
.qb-table td { padding: 14px 12px; border-bottom: 1px solid var(--qb-border); vertical-align: middle; font-size: 14px; }

/* ---------- Responsive ---------- */
.qb-sidebar-toggle { display: none; }

@media (max-width: 991.98px) {
  .qb-sidebar { transform: translateX(-100%); }
  .qb-sidebar.qb-open { transform: translateX(0); }
  .qb-main { margin-left: 0; }
  .qb-sidebar-toggle { display: flex; }
  .qb-content { padding: 18px; }
  .qb-topbar { padding: 0 16px; }
  .qb-msg { max-width: 88%; }
}

.qb-backdrop {
  display: none;
  position: fixed; inset: 0; background: rgba(11, 29, 46, 0.5); z-index: 1025;
}
.qb-backdrop.qb-open { display: block; }