/* css/header.css — Top header, logo, tabs, user menu, context bar, auth overlay */

/* Auth overlay */
.auth-overlay {
  position: fixed; inset: 0;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000;
}
.auth-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 36px;
  text-align: center;
  max-width: 380px;
  width: 90%;
  box-shadow: var(--shadow-lg);
}
.auth-card h1 { font-size: 22px; font-weight: 700; margin-bottom: 6px; }
.auth-card p  { color: var(--text-sec); font-size: 13px; margin-bottom: 24px; }
.auth-btn {
  width: 100%; padding: 12px; border: none; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 14px; cursor: pointer;
  transition: all var(--dur) var(--ease);
  display: flex; align-items: center; justify-content: center;
}
.auth-btn.primary {
  background: var(--grad-ras); color: white;
  margin-bottom: 10px;
}
.auth-btn.primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-glow-ras); }
.auth-btn.secondary {
  background: transparent; color: var(--text-sec); border: 1px solid var(--border);
}
.auth-btn.secondary:hover { border-color: var(--text-muted); }

/* Auth loading spinner */
.auth-loading {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  padding: 16px; color: var(--text-sec); font-size: 13px;
}
.auth-spinner {
  width: 20px; height: 20px;
  border: 2.5px solid var(--border);
  border-top-color: var(--ras);
  border-radius: 50%;
  animation: authSpin .7s linear infinite;
}
@keyframes authSpin { to { transform: rotate(360deg); } }

/* Auth error */
.auth-error {
  margin-top: 12px; padding: 8px 12px;
  background: #ef444415; border: 1px solid #ef444440;
  border-radius: var(--radius-xs);
  color: var(--danger); font-size: 12px; text-align: left;
}

/* Header */
.app-header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 0 20px;
  display: flex;
  align-items: center;
  height: 56px;
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 16px; letter-spacing: -0.3px;
  white-space: nowrap;
}
.logo svg { flex-shrink: 0; }

/* Tab nav */
.tab-nav {
  display: flex; gap: 2px;
  margin-left: auto;
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 3px;
}
.tab-btn {
  display: flex; align-items: center; gap: 6px;
  padding: 7px 14px;
  border: none; border-radius: var(--radius-xs);
  background: transparent;
  color: var(--text-muted);
  font-size: 12.5px; font-weight: 600; font-family: inherit;
  cursor: pointer;
  transition: all var(--dur) var(--ease);
  white-space: nowrap;
}
.tab-btn svg { width: 14px; height: 14px; }
.tab-btn:hover { color: var(--text-sec); background: var(--bg-hover); }
.tab-btn.active { color: var(--text); background: var(--bg-card); box-shadow: var(--shadow-sm); }

/* Header right controls */
.header-right {
  display: flex; align-items: center; gap: 8px;
  margin-left: 16px;
}
.lang-toggle {
  padding: 6px 10px; border: 1px solid var(--border); border-radius: var(--radius-xs);
  background: transparent; color: var(--text-sec);
  font-size: 12px; font-weight: 600; font-family: inherit;
  cursor: pointer; transition: all var(--dur) var(--ease);
}
.lang-toggle:hover { border-color: var(--ras); color: var(--ras); }

.signout-btn {
  display: flex; align-items: center; gap: 4px;
  padding: 6px 10px; border: 1px solid var(--border); border-radius: var(--radius-xs);
  background: transparent; color: var(--text-muted);
  font-size: 12px; font-family: inherit; cursor: pointer;
  transition: all var(--dur) var(--ease);
}
.signout-btn svg { width: 14px; height: 14px; }
.signout-btn:hover { border-color: var(--danger); color: var(--danger); }

/* Context bar */
.context-bar {
  background: var(--bg-card-2);
  border-bottom: 1px solid var(--border);
  padding: 6px 20px;
  display: flex; align-items: center; gap: 8px;
  font-size: 12.5px; color: var(--text-sec);
}
.ctx-badge {
  padding: 2px 8px; border-radius: 4px;
  font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px;
}
.ctx-badge.ras { background: var(--ras-glow); color: var(--ras); }
.ctx-badge.gk  { background: var(--gk-glow);  color: var(--gk); }
.ctx-badge.sci { background: var(--sci-glow);  color: var(--sci); }
.ctx-sep { color: var(--text-muted); }
.ctx-pct { font-weight: 600; }

/* Exam badge (shared) */
.exam-badge {
  display: inline-block;
  padding: 2px 7px; border-radius: 4px;
  font-size: 10px; font-weight: 700; text-transform: uppercase;
}
.exam-badge.ras { background: var(--ras-glow); color: var(--ras); }
.exam-badge.gk  { background: var(--gk-glow);  color: var(--gk); }
.exam-badge.sci { background: var(--sci-glow);  color: var(--sci); }

/* Mobile responsive */
@media (max-width: 640px) {
  .app-header { padding: 0 10px; height: 50px; }
  .logo span { display: none; }
  .tab-nav {
    position: fixed; bottom: 0; left: 0; right: 0;
    margin-left: 0;
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    border-radius: 0;
    z-index: 100;
    justify-content: center;
    padding: 4px 6px;
    backdrop-filter: blur(16px);
  }
  .tab-btn { padding: 10px 18px; font-size: 12px; }
  .tab-btn svg { display: none; }
  .context-bar { padding: 4px 10px; font-size: 11px; }
  body { padding-bottom: 52px; }
  .header-right { gap: 4px; margin-left: auto; }
  .icon-btn { width: 34px; height: 34px; }
  .lang-toggle { padding: 6px 8px; font-size: 11px; }
  .signout-btn { padding: 6px 8px; }
}