/* Theo Dõi Chu Kỳ — main styles */
[hidden] { display: none !important; }

.ck-container { max-width: 880px; padding-top: 40px; }

.back-link { display: inline-block; font-size: 0.9rem; color: var(--text-muted); margin-bottom: 24px; transition: color 0.2s ease; }
.back-link:hover { color: var(--accent); }

.ck-hero { margin-bottom: 24px; }
.ck-hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
.ck-hero .tagline { font-size: 0.95rem; }

.ck-card {
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px; margin-bottom: 16px;
}
.ck-card h2 { margin: 0 0 12px; font-size: 1rem; font-weight: 700; }
.ck-card h3 { margin: 0 0 12px; font-size: 0.95rem; font-weight: 700; }

.ck-predictions { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 16px; }
.ck-pred-card {
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 12px; text-align: center;
}
.ck-pred-value { font-size: 1.1rem; font-weight: 700; font-family: 'JetBrains Mono', monospace; line-height: 1.2; }
.ck-pred-label { font-size: 0.7rem; color: var(--text-muted); margin-top: 6px; letter-spacing: 0.06em; text-transform: uppercase; }

.ck-today {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 12px 16px; margin-bottom: 16px;
}
.ck-today-dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; }
.ck-today-desc { font-size: 0.85rem; color: var(--text-muted); flex: 1 1 100%; }

.ck-tabs { display: flex; gap: 0; border-bottom: 1px solid var(--border); margin-bottom: 16px; }
.ck-tab {
  background: transparent; border: none; border-bottom: 2px solid transparent;
  color: var(--text-muted); font: inherit; font-size: 0.9rem; font-weight: 600;
  padding: 10px 16px; margin-bottom: -1px; cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.ck-tab:hover { color: var(--text); }
.ck-tab.is-on { color: var(--accent); border-bottom-color: var(--accent); }

/* Calendar */
.ck-cal-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.ck-cal-head h2 { margin: 0; font-size: 1rem; font-weight: 700; }
.ck-icon-btn {
  background: transparent; border: 1px solid var(--border); color: var(--text);
  font: inherit; padding: 6px 10px; border-radius: 6px; cursor: pointer;
  transition: all 0.15s ease;
}
.ck-icon-btn:hover { border-color: var(--accent); color: var(--accent); }

.ck-cal-dow { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; margin-bottom: 4px; }
.ck-cal-dow > div { text-align: center; font-size: 0.72rem; color: var(--text-muted); padding: 6px 0; font-weight: 600; }
.ck-weekend { color: var(--danger); }
.ck-cal-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; }
.ck-cell, .ck-cell-empty { aspect-ratio: 1 / 1; }
.ck-cell {
  background: var(--bg); border: 1px solid var(--border); border-radius: 6px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 4px; font: inherit; font-size: 0.85rem; color: var(--text);
  cursor: pointer; transition: all 0.15s ease;
}
.ck-cell:hover { background: var(--bg-elev-hover); border-color: var(--accent); }
.ck-cell.is-today { border-color: var(--warn); background: rgba(251,191,36,0.06); }
.ck-cell.has-phase { background: var(--bg-elev); }
.ck-cell.is-prediction { border-style: dashed; opacity: 0.85; }
.ck-cell.is-selected { box-shadow: 0 0 0 2px var(--accent); }
.ck-cell-day { font-weight: 600; line-height: 1; }
.ck-cell-dot { width: 6px; height: 6px; border-radius: 50%; }

.ck-cal-legend {
  display: flex; flex-wrap: wrap; gap: 12px;
  padding-top: 12px; margin-top: 12px;
  border-top: 1px solid var(--border);
  font-size: 0.78rem; color: var(--text-muted);
}
.ck-legend-item { display: inline-flex; align-items: center; gap: 6px; }
.ck-legend-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.ck-legend-dot.ck-legend-dashed { border: 1px dashed var(--text-muted); background: transparent; border-radius: 2px; }

/* Day log form */
.ck-field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.ck-field-label { font-size: 0.78rem; color: var(--text-muted); letter-spacing: 0.06em; text-transform: uppercase; }
.ck-flow-row, .ck-symptom-row { display: flex; flex-wrap: wrap; gap: 6px; }
.ck-flow-pill, .ck-symptom-pill {
  background: transparent; color: var(--text-muted);
  border: 1px solid var(--border); border-radius: 999px;
  padding: 5px 12px; font: inherit; font-size: 0.82rem; cursor: pointer;
  transition: all 0.15s ease;
}
.ck-flow-pill:hover, .ck-symptom-pill:hover { border-color: var(--accent); color: var(--text); }
.ck-symptom-pill.is-on { background: var(--accent-glow); border-color: var(--accent); color: var(--accent); }

#log-notes, #new-start, #new-end {
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
  padding: 9px 12px; color: var(--text); font: inherit; font-size: 0.9rem;
  width: 100%; resize: vertical;
}
#log-notes:focus, #new-start:focus, #new-end:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }

.ck-btn-primary {
  width: 100%; background: var(--accent); color: #0b0d12;
  border: 1px solid var(--accent); border-radius: 8px;
  padding: 10px; font: inherit; font-weight: 600; font-size: 0.95rem;
  cursor: pointer; transition: transform 0.15s ease, opacity 0.2s ease;
}
.ck-btn-primary:hover:not(:disabled) { transform: translateY(-1px); }
.ck-btn-primary:disabled { opacity: 0.4; cursor: not-allowed; }

.ck-add-form { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 12px; }

.ck-cycle-row {
  display: flex; justify-content: space-between; align-items: center; gap: 8px;
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
  padding: 10px 12px; margin-bottom: 6px; font-size: 0.88rem;
}
.ck-cycle-row small { color: var(--text-muted); margin-left: 4px; }
.ck-cycle-actions { display: flex; align-items: center; gap: 10px; }
.ck-cycle-len { font-size: 0.78rem; color: var(--accent); font-family: 'JetBrains Mono', monospace; }

.ck-empty { color: var(--text-muted); text-align: center; padding: 16px; font-size: 0.88rem; margin: 0; }

.ck-stat-row { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; font-size: 0.85rem; }
.ck-stat-label { width: 110px; color: var(--text-muted); flex-shrink: 0; }
.ck-stat-bar { flex: 1; height: 22px; background: var(--bg); border-radius: 4px; position: relative; overflow: hidden; }
.ck-stat-fill { height: 100%; background: rgba(248,113,113,0.4); transition: width 0.3s ease; }
.ck-stat-count { position: absolute; right: 8px; top: 50%; transform: translateY(-50%); font-size: 0.78rem; color: var(--text); font-weight: 600; }

.ck-phase-row { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; margin-bottom: 8px; }
.ck-phase-row-head { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }
.ck-phase-row p { margin: 0; font-size: 0.85rem; color: var(--text-muted); }