/* =============================================================================
 * StudyNotes — shared design tokens + frame (top bar) + hub home page styles.
 * Loaded AFTER each subject app's own CSS so the frame reconciliation
 * overrides below win the cascade. All frame classes are prefixed "ss-".
 * ========================================================================== */

/* ---------- tokens ---------- */
:root {
  --ss-ink: #1c2130;
  --ss-bar: #1c2130;
  --ss-bar-text: #e8eaf1;
  --ss-muted: #5e6573;
  --ss-line: #e7e8ed;
  --ss-paper: #fbfbfc;
  --ss-accent: #272c39;                 /* home */
  --ss-accent-gre: #3568bd;             /* matches GRE Notes blue */
  --ss-accent-stats: #283bc9;           /* matches Stats Notes indigo */
  --ss-accent-vocab: #6366f1;
}

/* ---------- shared frame: top bar ---------- */
.ss-topbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 16px;
  height: 46px;
  padding: 0 16px;
  background: var(--ss-bar);
  color: var(--ss-bar-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px;
  border-bottom: 2px solid var(--ss-accent);
}
body[data-site="gre"] .ss-topbar { --ss-accent: var(--ss-accent-gre); }
body[data-site="stats"] .ss-topbar { --ss-accent: var(--ss-accent-stats); }

.ss-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  color: #fff;
  font-weight: 700;
  letter-spacing: -.3px;
  white-space: nowrap;
  text-decoration: none;
}
.ss-brand-mark {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: var(--ss-accent);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
}
.ss-subjects {
  display: flex;
  align-items: center;
  gap: 3px;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.ss-subjects::-webkit-scrollbar { display: none; }
.ss-subject {
  padding: 5px 11px;
  border-radius: 7px;
  color: #c4c9d8;
  white-space: nowrap;
  text-decoration: none;
}
a.ss-subject:hover { background: #2a3042; color: #fff; }
.ss-subject.ss-active {
  background: var(--ss-accent);
  color: #fff;
  font-weight: 600;
}
.ss-soon { opacity: .5; font-size: 12.5px; cursor: default; }
.ss-soon small { margin-left: 4px; font-size: 10px; letter-spacing: 1px; text-transform: uppercase; }
.ss-vocab {
  margin-left: auto;
  white-space: nowrap;
  padding: 6px 12px;
  border-radius: 8px;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #fff;
  font-weight: 600;
  font-size: 13px;
  text-decoration: none;
}
.ss-vocab:hover { filter: brightness(1.12); }

/* ---------- frame + subject app layout reconciliation ----------
 * Both subject apps have viewport-fixed sidebars on desktop only.
 * The sticky bar sits in normal flow, so page content already flows
 * below it; these rules only pull the fixed sidebars down 46px. */
@media (min-width: 851px) {  /* GRE sidebar is fixed above 850px */
  body.ss-framed[data-site="gre"] .sidebar { top: 46px; height: calc(100vh - 46px); }
}
@media (min-width: 1001px) { /* Stats sidebar is fixed above 1000px */
  body.ss-framed[data-site="stats"] .sidebar { top: 46px; height: calc(100vh - 46px); }
}
/* Keep the "skip to content" links visible below the bar when focused */
body.ss-framed .skip:focus { top: 56px; }

/* ---------- hub home page ---------- */
.ss-home {
  max-width: 1040px;
  margin: 0 auto;
  padding: 56px 24px 32px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ss-ink);
  background: var(--ss-paper);
}
.ss-hero { max-width: 720px; }
.ss-eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2.5px;
  color: var(--ss-muted);
}
.ss-hero h1 {
  margin: 0 0 14px;
  font-size: clamp(30px, 5vw, 44px);
  letter-spacing: -1.2px;
  line-height: 1.15;
}
.ss-lede { margin: 0; font-size: 17px; line-height: 1.65; color: var(--ss-muted); }

.ss-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
  margin-top: 40px;
}
.ss-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 22px 20px;
  background: #fff;
  border: 1px solid var(--ss-line);
  border-top: 3px solid var(--ss-accent-gre);
  border-radius: 14px;
  color: var(--ss-ink);
  text-decoration: none;
  box-shadow: 0 4px 18px #26306a05;
  transition: transform .14s ease, box-shadow .14s ease;
}
a.ss-card:hover { transform: translateY(-2px); box-shadow: 0 10px 26px #26306a12; }
.ss-card-gre { border-top-color: var(--ss-accent-gre); }
.ss-card-stats { border-top-color: var(--ss-accent-stats); }
.ss-card-vocab { border-top-color: var(--ss-accent-vocab); }
.ss-card-soon { border-top-color: var(--ss-line); opacity: .8; }
.ss-card-tag {
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 1.6px;
  color: var(--ss-muted);
}
.ss-card h2 { margin: 0; font-size: 22px; letter-spacing: -.5px; }
.ss-card h2 small { font-size: 15px; }
.ss-card p { margin: 0; font-size: 14.5px; line-height: 1.6; color: var(--ss-muted); flex: 1; }
.ss-card-enter { font-size: 14px; font-weight: 600; color: var(--ss-accent); }
.ss-card-soon .ss-card-enter { color: var(--ss-muted); }
.ss-muted { color: var(--ss-muted); }

.ss-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  margin-top: 48px;
  padding-top: 18px;
  border-top: 1px solid var(--ss-line);
  font-size: 12px;
  color: var(--ss-muted);
}

@media (max-width: 720px) {
  .ss-topbar { gap: 8px; padding: 0 10px; }
  .ss-brand-name { display: none; }
  .ss-soon { display: none; }
  .ss-subject { padding: 5px 8px; font-size: 13px; }
  .ss-home { padding: 36px 18px 24px; }
  .ss-cards { grid-template-columns: 1fr; margin-top: 28px; }
}
/* ---------- portal accents (two study sites, one frame) ---------- */
body[data-portal="testprep"] .ss-topbar { --ss-accent: var(--ss-accent-gre); }
body[data-portal="stem"] .ss-topbar { --ss-accent: var(--ss-accent-stats); }

/* ---------- cross-site link (shown only when a real URL is configured) ---------- */
.ss-other {
  color: #9aa3b8;
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  padding: 5px 8px;
  border-radius: 7px;
}
.ss-other:hover { background: #2a3042; color: #fff; }