:root {
  --bg: #0f1320;
  --bg-soft: #171c2e;
  --panel: #1b2138;
  --panel-2: #222a45;
  --border: #2c3556;
  --text: #e8ecf8;
  --muted: #9aa3c4;
  --primary: #6c8cff;
  --primary-dark: #506fe0;
  --success: #44d6a0;
  --gold: #ffcf5c;
  --danger: #ff6b81;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --radius: 14px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 80% -10%, #1d2440 0%, var(--bg) 55%);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Top bar ---------- */
.topbar {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
  padding: 28px clamp(16px, 5vw, 56px);
  border-bottom: 1px solid var(--border);
  background: rgba(15, 19, 32, 0.6);
  backdrop-filter: blur(6px);
}

.brand { display: flex; align-items: center; gap: 16px; }

.brand-mark {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), var(--success));
  color: #0f1320;
  font-size: 28px;
  font-weight: 800;
  box-shadow: var(--shadow);
}

.brand h1 { margin: 0; font-size: 26px; letter-spacing: 0.3px; }
.tagline { margin: 2px 0 0; color: var(--muted); font-size: 14px; }

.topbar-right { display: flex; flex-direction: column; align-items: flex-end; gap: 12px; }
.toolbar { display: flex; gap: 10px; }

.stats { display: flex; gap: 12px; flex-wrap: wrap; }

.stat {
  min-width: 92px;
  padding: 12px 16px;
  border-radius: 12px;
  background: var(--panel);
  border: 1px solid var(--border);
  text-align: center;
}
.stat-value { display: block; font-size: 24px; font-weight: 700; }
.stat-label { display: block; font-size: 12px; color: var(--muted); margin-top: 2px; }

/* ---------- Layout ---------- */
main {
  max-width: 980px;
  margin: 0 auto;
  padding: 32px clamp(16px, 5vw, 56px) 80px;
  display: grid;
  gap: 24px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 18px;
}
.panel-head h2 { margin: 0; font-size: 18px; }

/* ---------- Buttons ---------- */
.btn {
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.05s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.4; cursor: default; transform: none; }
.btn-primary { background: var(--primary); color: #0f1320; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: transparent; color: var(--muted); border-color: var(--border); }
.btn-ghost:hover { color: var(--text); border-color: var(--muted); }

.btn-did {
  background: rgba(68, 214, 160, 0.14);
  color: var(--success);
  border-color: rgba(68, 214, 160, 0.4);
}
.btn-did:hover { background: rgba(68, 214, 160, 0.24); }

.icon-btn {
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 18px;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 8px;
  line-height: 1;
}
.icon-btn:hover { color: var(--danger); background: rgba(255, 107, 129, 0.12); }

/* ---------- Add form ---------- */
.add-form { display: flex; gap: 10px; flex: 1; min-width: 260px; max-width: 460px; }
.add-form input {
  flex: 1;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  padding: 10px 14px;
  font-size: 14px;
}
.add-form input:focus { outline: none; border-color: var(--primary); }

/* ---------- Calendar ---------- */
.cal-nav { display: flex; gap: 8px; flex-wrap: wrap; }
.cal-nav .btn { padding: 8px 12px; }

.cal-monthbar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 16px;
}
.cal-title { font-size: 18px; font-weight: 700; min-width: 170px; text-align: center; }

.cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
}
.cal-weekday {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  padding-bottom: 2px;
}

.cal-day {
  position: relative;
  min-height: 58px;
  padding: 6px 8px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 14px;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.05s ease;
}
.cal-day:hover { border-color: var(--muted); }
.cal-day:active { transform: translateY(1px); }
.cal-day.other-month { opacity: 0.4; }
.cal-day.has-logs:not(.selected) { border-color: rgba(108, 140, 255, 0.5); }
.cal-day.today { border-color: var(--primary); }
.cal-day.selected {
  background: var(--primary);
  color: #0f1320;
  border-color: var(--primary);
}
.cal-daynum { font-weight: 600; }
.cal-count {
  position: absolute;
  right: 6px;
  bottom: 6px;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  display: grid;
  place-items: center;
  border-radius: 99px;
  background: rgba(108, 140, 255, 0.22);
  color: var(--primary);
  font-size: 11px;
  font-weight: 700;
}
.cal-day.selected .cal-count { background: rgba(15, 19, 32, 0.25); color: #0f1320; }

/* ---------- Selected-day detail ---------- */
.day-detail {
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.day-title { margin: 0 0 14px; font-size: 16px; }
.day-detail .add-form { max-width: none; margin-bottom: 16px; }

/* ---------- Task list ---------- */
.task-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }

.task-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 16px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 12px;
}
.task-main { flex: 1; min-width: 0; }
.task-name { font-weight: 600; font-size: 16px; }
.task-meta { color: var(--muted); font-size: 13px; margin-top: 3px; display: flex; gap: 14px; flex-wrap: wrap; }

.task-count {
  display: grid;
  place-items: center;
  min-width: 46px;
  height: 46px;
  padding: 0 10px;
  border-radius: 10px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  font-weight: 700;
  font-size: 18px;
}

/* ---------- Activity ---------- */
.activity-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; max-height: 320px; overflow-y: auto; }
.activity-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 14px;
}
.activity-item .when { color: var(--muted); white-space: nowrap; }

/* ---------- Achievements ---------- */
.achievement-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}
.achievement {
  position: relative;
  padding: 16px;
  border-radius: 12px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  opacity: 0.6;
  transition: opacity 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.achievement.unlocked {
  opacity: 1;
  border-color: rgba(255, 207, 92, 0.5);
  background: linear-gradient(160deg, rgba(255, 207, 92, 0.12), var(--panel-2));
}
.achievement-top { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.achievement-icon { font-size: 26px; filter: grayscale(1); }
.achievement.unlocked .achievement-icon { filter: none; }
.achievement-title { font-weight: 700; font-size: 15px; }
.achievement-desc { color: var(--muted); font-size: 13px; line-height: 1.4; }

.progress {
  margin-top: 12px;
  height: 7px;
  border-radius: 99px;
  background: var(--bg-soft);
  overflow: hidden;
}
.progress-bar { height: 100%; border-radius: 99px; background: linear-gradient(90deg, var(--primary), var(--success)); }
.achievement.unlocked .progress-bar { background: linear-gradient(90deg, var(--gold), #ffb347); }
.progress-text { font-size: 12px; color: var(--muted); margin-top: 6px; display: block; }
.achievement-reset { margin-top: 12px; padding: 6px 12px; font-size: 12px; }

.unlocked-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  font-size: 11px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.5px;
}

/* ---------- Misc ---------- */
.empty { color: var(--muted); font-size: 14px; text-align: center; padding: 18px 0; }
.badge-count { color: var(--muted); font-size: 14px; }
.hidden { display: none !important; }

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 20px;
  border-radius: 12px;
  box-shadow: var(--shadow);
  font-size: 14px;
  z-index: 50;
  animation: toastIn 0.2s ease;
}
.toast.achievement-toast { border-color: var(--gold); }
@keyframes toastIn { from { opacity: 0; transform: translate(-50%, 12px); } to { opacity: 1; transform: translate(-50%, 0); } }

@media (max-width: 560px) {
  .topbar { flex-direction: column; align-items: flex-start; }
  .topbar-right { width: 100%; align-items: stretch; }
  .toolbar { justify-content: flex-start; }
  .stats { width: 100%; }
  .stat { flex: 1; min-width: 0; }
}