:root {
  --bg: #0d1117;
  --card: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --dim: #8b949e;
  --green: #39d353;
  --green-mid: #26a641;
  --green-dark: #0e4429;
  --empty: #21262d;
  --danger: #f85149;
}

* { box-sizing: border-box; }

/* The hidden attribute must always win, even over display rules like .signin's flex */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

button { font: inherit; cursor: pointer; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(8px);
  z-index: 5;
  padding-top: max(12px, env(safe-area-inset-top));
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 17px;
}

.brand-sq {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  background: var(--green);
  display: inline-block;
}

.brand-sq.big { width: 40px; height: 40px; border-radius: 10px; }

.top-actions { display: flex; align-items: center; gap: 10px; }

.avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--border);
}

.sync-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--dim);
  display: inline-block;
}
.sync-dot.synced { background: var(--green); }
.sync-dot.syncing { background: #d29922; }
.sync-dot.error { background: var(--danger); }

.wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: 16px;
  padding-bottom: max(32px, env(safe-area-inset-bottom));
}

.banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  margin-bottom: 16px;
  color: var(--dim);
  font-size: 13px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}

.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
}

.stat-value {
  font-size: 22px;
  font-weight: 700;
  color: var(--green);
}

.stat-label {
  font-size: 12px;
  color: var(--dim);
  margin-top: 2px;
}

.week-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  gap: 8px;
}

.week-label { text-align: center; font-weight: 600; }
.week-label .ghost-btn { margin-top: 2px; font-size: 12px; }

.nav-btn {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  width: 40px;
  height: 36px;
  font-size: 20px;
  line-height: 1;
}
.nav-btn:hover { border-color: var(--dim); }

.grid-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  overflow-x: auto;
}

.grid {
  display: grid;
  grid-template-columns: minmax(84px, 1fr) repeat(7, minmax(30px, 44px));
  gap: 6px;
  align-items: center;
}

.day-head {
  text-align: center;
  font-size: 11px;
  color: var(--dim);
  line-height: 1.3;
}
.day-head .dnum { font-size: 12px; color: var(--text); font-weight: 600; }
.day-head.today .dnum { color: var(--green); }
.day-head.today { color: var(--green); }

.habit-name {
  font-size: 13px;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  background: none;
  border: none;
  color: var(--text);
  text-align: left;
  padding: 4px 2px;
  border-radius: 6px;
}
.habit-name:hover { color: var(--green); }

.sq {
  aspect-ratio: 1;
  width: 100%;
  border-radius: 7px;
  border: 1px solid transparent;
  background: transparent;
  padding: 0;
  transition: transform 0.08s ease;
}
.sq:active:not(:disabled) { transform: scale(0.9); }
.sq.goal { background: var(--empty); border-color: var(--border); }
.sq.off { background: rgba(33, 38, 45, 0.35); }
.sq.done.goal { background: var(--green-mid); border-color: var(--green); }
.sq.done.off { background: var(--green-dark); border-color: transparent; }
.sq.future { opacity: 0.35; cursor: default; }

.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--dim);
  padding: 24px 8px;
  font-size: 14px;
}

.add-btn {
  width: 100%;
  margin-top: 14px;
  padding: 12px;
  border-radius: 10px;
  border: 1px dashed var(--border);
  background: none;
  color: var(--dim);
  font-size: 14px;
}
.add-btn:hover { color: var(--green); border-color: var(--green-mid); }

.ghost-btn {
  background: none;
  border: none;
  color: var(--dim);
  font-size: 13px;
  padding: 4px 8px;
  border-radius: 6px;
}
.ghost-btn:hover { color: var(--text); }

.primary-btn {
  background: var(--green-mid);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 8px 18px;
  font-weight: 600;
}
.primary-btn:hover { background: var(--green); }

.danger-btn {
  background: none;
  border: 1px solid var(--danger);
  color: var(--danger);
  border-radius: 8px;
  padding: 7px 14px;
}

.signin {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  padding: 24px;
}

.signin-card {
  text-align: center;
  max-width: 320px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.signin-card h1 { margin: 0; }
.signin-card p { color: var(--dim); margin: 0 0 8px; font-size: 14px; }

dialog {
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  width: min(92vw, 380px);
}
dialog::backdrop { background: rgba(0, 0, 0, 0.6); }

#habit-form { display: flex; flex-direction: column; gap: 8px; }
#habit-form h2 { margin: 0 0 6px; font-size: 18px; }
#habit-form label { font-size: 12px; color: var(--dim); margin-top: 6px; }

#habit-name {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 10px 12px;
  font-size: 15px;
}
#habit-name:focus { outline: none; border-color: var(--green-mid); }

.day-chips { display: flex; gap: 6px; }

.day-chip {
  flex: 1;
  aspect-ratio: 1;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--dim);
  font-size: 12px;
  font-weight: 600;
}
.day-chip.on {
  background: var(--green-mid);
  border-color: var(--green);
  color: #fff;
}

.dialog-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
}
.dialog-actions .spacer { flex: 1; }