/* StudyFlow — Context Rail
 * position: fixed; sol kenarda; sadece 1440px+ ekranlarda görünür.
 * Layout'a dokunmaz, content'i sıkıştırmaz. */

.sf-rail {
  display: none;
  position: fixed;
  left: 0;
  top: 70px;
  width: 196px;
  height: calc(100vh - 70px);
  padding: 28px 12px 40px 20px;
  overflow-y: auto;
  border-right: 1px solid rgba(255,255,255,0.055);
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.06) transparent;
  z-index: 40;
  flex-direction: column;
  gap: 0;
}

@media (min-width: 1440px) {
  .sf-rail { display: flex; }
}

/* ── Active tool card ── */
.sf-rail-card {
  background: rgba(255,255,255,0.036);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 13px;
  padding: 13px 14px;
  margin-bottom: 16px;
  flex-shrink: 0;
}

.sf-rail-eyebrow {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 10px;
  font-weight: 700;
  color: rgba(96,165,250,0.5);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.sf-rail-tool-row {
  display: flex;
  align-items: flex-start;
  gap: 9px;
}

.sf-rail-tool-emoji {
  font-size: 19px;
  line-height: 1;
  flex-shrink: 0;
  margin-top: 1px;
}

.sf-rail-tool-name {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 12px;
  font-weight: 700;
  color: #f1f5f9;
  letter-spacing: -0.01em;
  margin-bottom: 3px;
  line-height: 1.3;
}

.sf-rail-tool-desc {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 11px;
  color: #2e3d4e;
  line-height: 1.45;
}

/* ── Nav section ── */
.sf-rail-sep {
  height: 1px;
  background: rgba(255,255,255,0.06);
  margin-bottom: 13px;
  flex-shrink: 0;
}

.sf-rail-section-label {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 10px;
  font-weight: 700;
  color: #253040;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 5px;
  padding: 0 8px;
  flex-shrink: 0;
}

.sf-rail-link {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 6px 8px;
  border-radius: 8px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 12px;
  color: #3b4a5a;
  text-decoration: none;
  transition: background 0.13s, color 0.13s;
  margin-bottom: 1px;
}

.sf-rail-link:hover {
  background: rgba(255,255,255,0.045);
  color: #8fa3b8;
}

.sf-rail-link-icon {
  font-size: 13px;
  width: 16px;
  text-align: center;
  flex-shrink: 0;
}

/* ── Tip section ── */
.sf-rail-tip {
  margin-top: auto;
  padding-top: 16px;
  flex-shrink: 0;
}

.sf-rail-tip-label {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 9px;
  font-weight: 700;
  color: rgba(96,165,250,0.45);
  letter-spacing: 0.09em;
  text-transform: uppercase;
  margin-bottom: 7px;
}

.sf-rail-tip-body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 11px;
  color: rgba(148,163,184,0.55);
  line-height: 1.5;
  padding: 10px 12px;
  background: rgba(255,255,255,0.028);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 9px;
}