:root {
  /* Legacy aliases → Social V3 pack + SDD semantic (UI-G01) */
  --surf: #089eaa;
  --surf-light: #e6f7f8;
  --border: #e2e8f0;
  --text: #142b45;
  --muted: #64748b;
  --cream: #f5f7fa;
  --surf-hover: #087f89;
  --danger: #b42318;
  --success: #087f5b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background: var(--cream);
  line-height: 1.5;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0.5rem;
  z-index: 1000;
  padding: 0.5rem 0.85rem;
  background: var(--surf);
  color: #fff;
  border-radius: 8px;
  text-decoration: none;
}
.skip-link:focus {
  left: 0.75rem;
}

:focus-visible {
  outline: 2px solid var(--surf);
  outline-offset: 2px;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding: 0.75rem 1.25rem;
  background: #fff;
  border-bottom: 1px solid var(--border);
}

.brand { font-weight: 700; color: var(--surf); text-decoration: none; font-size: 1.15rem; }

.site-nav { display: flex; gap: 0.85rem 1rem; flex-wrap: wrap; }
.site-nav a { color: var(--text); text-decoration: none; font-size: 0.95rem; }
.site-nav a:hover { color: var(--surf); }

.site-main { max-width: 960px; margin: 0 auto; padding: 1.25rem; }
.site-main:focus { outline: none; }
.site-main:focus-visible { outline: 2px solid var(--surf); outline-offset: 4px; }

.home-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  align-items: center;
}

@media (max-width: 480px) {
  .site-main { padding: 0.85rem; }
  .hero h1 { font-size: 1.45rem; }
  .site-nav { gap: 0.55rem 0.75rem; }
  .site-nav a { font-size: 0.88rem; }
  .btn { padding: 0.55rem 0.85rem; }
}

.site-footer {
  display: flex;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  font-size: 0.85rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
}

.btn {
  display: inline-block;
  border: none;
  border-radius: 8px;
  padding: 0.5rem 1rem;
  background: var(--surf);
  color: #fff;
  cursor: pointer;
  font-size: 0.95rem;
}
.btn.secondary { background: #fff; color: var(--surf); border: 1px solid var(--border); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.field { display: flex; flex-direction: column; gap: 0.35rem; margin-bottom: 0.75rem; }
.field input, .field select, .field textarea {
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
}

.muted { color: var(--muted); font-size: 0.9rem; }
.hidden { display: none !important; }

.hero h1 { margin-top: 0; font-size: 1.75rem; }
.explore-list { list-style: none; padding: 0; margin: 0; }
.explore-list li { margin-bottom: 0.75rem; }
.explore-list a { font-weight: 600; color: var(--surf); text-decoration: none; }
.explore-list a:hover { text-decoration: underline; }
.grid-2 { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

.app-shell-top { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; margin-bottom: 0.75rem; }
.context-pill { font-size: 0.85rem; background: var(--surf-light); color: var(--surf); padding: 0.25rem 0.65rem; border-radius: 999px; }
.app-tabs .tab.disabled { opacity: 0.45; pointer-events: none; }
a.tab { text-decoration: none; color: inherit; display: inline-block; }
a.tab.active { background: var(--surf-light); color: var(--surf); }

.tabs { display: flex; gap: 0.5rem; margin-bottom: 1rem; flex-wrap: wrap; }
.tab {
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #fff;
  cursor: pointer;
  font: inherit;
  color: inherit;
}
button.tab { appearance: none; -webkit-appearance: none; }
.tab.active { background: var(--surf-light); border-color: var(--surf); color: var(--surf); font-weight: 600; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 720px) { .grid-2 { grid-template-columns: 1fr; } }

.feed-item, .people-card, .msg-row, .notif-row {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem;
  margin-bottom: 0.5rem;
  background: #fff;
}

.chat-log {
  height: 220px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem;
  background: #fff;
  margin-bottom: 0.5rem;
}

/* DM history pane — real scroll container so load-older can preserve viewport anchors. */
#msg-list {
  height: min(60vh, 480px);
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem;
  background: #fff;
  margin-bottom: 0.5rem;
}

/* Keep load-older visible while scrolled to newest — avoids scroll-into-view jump on click. */
#msg-list .dm-load-older {
  position: sticky;
  top: 0;
  z-index: 2;
  width: 100%;
  margin-bottom: 0.5rem;
}

.status-pill {
  display: inline-block;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 999px;
  background: #f1f5f9;
}
.status-pill.ready { background: #ecfdf5; color: var(--success); }
.status-pill.blocked { background: #fef2f2; color: var(--danger); }

/* S63 connectivity banner host */
.sm-connectivity-host { margin: 8px 0; }
.sm-connectivity-host[hidden] { display: none !important; }
.sm-connectivity-banner {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
}
.sm-connectivity-banner[data-kind="offline"],
.sm-connectivity-banner[data-kind="error"] { background: #fff7ed; color: #9a6200; }
.sm-connectivity-banner[data-kind="connecting"] { background: #eaf4fc; color: #09558f; }
.sm-connectivity-banner[data-kind="recovered"] { background: #ecfdf5; color: #087f5b; }

.hero { text-align: center; padding: 2rem 0; }
.hero h1 { font-size: 2rem; margin-bottom: 0.5rem; }

.tag-list { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag-chip {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.25rem 0.65rem;
  background: #fff;
  cursor: pointer;
  font: inherit;
  font-size: 0.85rem;
}
.tag-chip.selected { background: var(--surf-light); border-color: var(--surf); color: var(--surf); }

.people-card-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 0.35rem; }
.people-actions { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.5rem; }
.metric-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.35rem; margin: 0.5rem 0; }
.metric-box {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.35rem;
  text-align: center;
  font-size: 0.75rem;
}
.metric-box strong { display: block; font-size: 0.95rem; }
@media (max-width: 720px) { .metric-grid { grid-template-columns: repeat(2, 1fr); } }

.cobrowse-bar { display: flex; align-items: center; justify-content: space-between; gap: 1rem; background: var(--surf-light); }

.notif-dot {
  display: inline-block;
  min-width: 8px;
  height: 8px;
  border-radius: 8px;
  background: var(--danger);
  vertical-align: middle;
  color: #fff;
  font-size: 10px;
  line-height: 14px;
  text-align: center;
  padding: 0 4px;
}
.notif-dot:empty {
  width: 8px;
  min-width: 8px;
  padding: 0;
}
.notif-dot.hidden { display: none; }

/* Shared product dialogs (S57 / S51 / S65) — minimal host chrome */
.sm-dialog {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0;
  max-width: min(520px, calc(100vw - 24px));
  color: var(--text);
  background: #fff;
  box-shadow: 0 12px 40px rgba(20, 33, 61, 0.18);
}
.sm-dialog::backdrop { background: rgba(20, 33, 61, 0.45); }
.sm-dialog-head { padding: 1rem 1.1rem 0.35rem; }
.sm-dialog-head h2 { font-size: 1.15rem; margin: 0; }
.sm-dialog-body { padding: 0.5rem 1.1rem 0.75rem; }
.sm-dialog-actions { padding: 0.75rem 1.1rem 1rem; gap: 0.5rem; }
.sm-dialog-actions .sm-button,
.sm-dialog-actions .btn { margin: 0; }

/* S49 Surf Mode help popover (not nested Modal) */
.sm-s49-popover {
  background: #fff;
  border: 1px solid var(--border, #D9E2EF);
  border-radius: 12px;
  box-shadow: 0 8px 28px rgba(20, 33, 61, 0.16);
  padding: 12px 14px;
  max-height: min(70vh, 480px);
  overflow: auto;
}
.sm-s49-popover-head { margin-bottom: 8px; }
.sm-s49-popover-head h3 { font-size: 1.05rem; margin: 0; }
.sm-s49-mode-list { list-style: none; margin: 0; padding: 0; gap: 10px; }
.sm-s49-mode-list li { display: grid; gap: 2px; padding: 8px 0; border-bottom: 1px solid var(--border, #EEF2F7); }
.sm-s49-mode-list li:last-child { border-bottom: 0; }