/* ═══ STUDY SPRINT ═══ */

#ss-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--navy);
  z-index: 99999;
  flex-direction: column;
  font-family: 'DM Sans', sans-serif;
  color: var(--text);
}

.ss-header {
  position: sticky;
  top: 0;
  background: rgba(8,15,10,0.97);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
  padding: 16px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  z-index: 10;
  flex-shrink: 0;
}

.ss-eyebrow {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 3px;
}

.ss-heading {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1.55rem;
  letter-spacing: 2px;
  line-height: 1;
  color: var(--text);
}

.ss-subject-tabs {
  display: flex;
  gap: 8px;
  padding: 16px 28px 0;
  flex-shrink: 0;
}

.ss-subject-tab {
  padding: 9px 18px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.03);
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
}

.ss-subject-tab.active {
  border-color: var(--accent);
  background: rgba(0,201,106,0.1);
  color: var(--accent);
}

#ss-body {
  flex: 1;
  overflow-y: auto;
  padding: 20px 28px 60px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
  align-content: start;
}

.ss-chapter-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ss-chapter-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.35;
}

.ss-chapter-status {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 100px;
  display: inline-block;
  width: fit-content;
}

.ss-tone-new .ss-chapter-status { background: rgba(255,255,255,0.06); color: var(--muted); }
.ss-tone-scheduled .ss-chapter-status { background: rgba(0,201,106,0.1); color: var(--accent); }
.ss-tone-due .ss-chapter-status { background: rgba(244,197,66,0.12); color: var(--gold); }
.ss-tone-overdue .ss-chapter-status { background: rgba(255,77,109,0.12); color: var(--danger); }

.ss-chapter-actions {
  display: flex;
  gap: 8px;
  margin-top: 4px;
}

.ss-btn-notes, .ss-btn-test {
  flex: 1;
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  font-family: 'DM Sans', sans-serif;
}

.ss-btn-notes {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
}

.ss-btn-test {
  background: var(--accent);
  border: none;
  color: var(--navy);
}

.ss-close-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.88rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.ss-close-btn:hover { border-color: var(--danger); color: var(--danger); }

@media (max-width: 600px) {
  .ss-header, .ss-subject-tabs { padding-left: 16px; padding-right: 16px; }
  #ss-body { padding-left: 16px; padding-right: 16px; grid-template-columns: 1fr; }
}