:root {
  color-scheme: dark light;
  --bg: #0b0f14;
  --panel: #111720;
  --panel-2: #0e141c;
  --text: #e6edf3;
  --text-dim: #a9b4bf;
  --accent: #5b9cff;
  --accent-2: #8ab4ff;
  --muted: #1b2430;
  --border: #223045;
  --border-accent: rgba(91,156,255,.35);
  --danger: #ff6b6b;
  --success: #4ad295;
  --focus: #b6d4ff;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --shadow-soft: 0 6px 20px rgba(12, 18, 26, .45);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: linear-gradient(180deg, var(--bg), #0a1017 60%);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 1px, 1px);
  white-space: nowrap;
  border: 0;
}

.app-header, .app-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  background: linear-gradient(180deg, #0c121a, #0a1118);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 0 rgba(255,255,255,.03) inset, 0 1px 0 rgba(0,0,0,.4) inset;
}
.app-footer { border-top: 1px solid var(--border); border-bottom: none; opacity: .85; gap: 10px; }
.app-footer .creator { color: var(--text-dim); }
.app-title { margin: 0; font-size: 20px; font-weight: 700; letter-spacing: .3px; }
.subtitle { margin-left: 10px; color: var(--text-dim); font-size: 13px; }
.header-actions { display: inline-flex; gap: 10px; align-items: center; }

.container {
  max-width: 860px;
  margin: 24px auto 40px;
  padding: 0 16px;
}

.add-task form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  background: var(--panel);
  padding: 14px;
  border: 1px solid var(--border-accent);
  border-radius: 12px;
  box-shadow: var(--shadow-soft);
}

input[type="text"], input[type="search"] {
  width: 100%;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 12px 14px;
  border-radius: 10px;
  outline: none;
}
input::placeholder { color: #8391a3; }
input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(91,156,255,.18), 0 6px 24px rgba(91,156,255,.10); }

button {
  background: var(--accent);
  color: #0b0f14;
  font-weight: 600;
  border: none;
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
  transition: transform .06s ease, box-shadow .15s ease, background .2s ease, color .2s ease;
}
button.primary { min-width: 88px; }
button:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
button:disabled { opacity: .6; cursor: not-allowed; }
button:hover { box-shadow: 0 6px 18px rgba(91,156,255,.28); transform: translateY(-1px); }
button:active { transform: translateY(0); box-shadow: none; }

.icon-button {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border-accent);
  padding: 8px 10px;
}
.ghost-button {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
}
.ghost-button:hover { color: var(--text); border-color: #2b3a52; }

.progress { margin-top: 18px; }
.progress-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.progress h2 { margin: 0; font-size: 14px; font-weight: 600; color: var(--text-dim); }
.progress-bar {
  width: 100%;
  height: 14px;
  background: var(--muted);
  border: 1px solid var(--border-accent);
  border-radius: 999px;
  overflow: hidden;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.04), inset 0 -8px 18px rgba(0,0,0,.35);
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width .25s ease;
}

.controls {
  margin-top: 16px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
}
.filters { display: inline-flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.chip {
  background: var(--panel-2);
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 6px 10px;
  border-radius: 999px;
  transition: background .2s ease, color .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.chip:hover { border-color: var(--border-accent); box-shadow: 0 6px 16px rgba(0,0,0,.35); }
.chip.active { color: #09131e; background: var(--accent); border-color: var(--accent); box-shadow: 0 8px 20px rgba(91,156,255,.35); }

.search input { width: 230px; }

.task-list { margin-top: 16px; }
.tasks { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.task {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
  background: var(--panel);
  border: 1px solid var(--border-accent);
  padding: 12px;
  border-radius: 12px;
  box-shadow: var(--shadow-soft);
  transition: transform .1s ease, box-shadow .2s ease, border-color .2s ease;
}
.task:hover { transform: translateY(-1px); box-shadow: 0 12px 26px rgba(0,0,0,.45); }
.task.completed { opacity: .78; }
.task .title { display: block; }
.task .title[contenteditable="true"] { outline: 2px dashed transparent; border-radius: 6px; padding: 2px 4px; }
.task.editing .title[contenteditable="true"] { outline-color: #2b3a52; background: var(--panel-2); }
.task .actions { display: inline-flex; gap: 6px; }
.task .checkbox { width: 20px; height: 20px; }
.task .delete { background: transparent; color: var(--danger); border: 1px solid #3a2230; }
.task .edit { background: transparent; color: var(--accent-2); border: 1px solid #2a3655; }
.task .save { background: var(--success); color: #09131e; }

.empty { text-align: center; color: var(--text-dim); padding: 18px; border: 1px dashed var(--border-accent); border-radius: 12px; background: #0b1119; box-shadow: inset 0 1px 0 rgba(255,255,255,.03); }

/* Activity / Monthly chart */
.activity { margin-top: 22px; background: var(--panel); border: 1px solid var(--border-accent); border-radius: 12px; padding: 14px; box-shadow: var(--shadow-soft); }
.activity-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.activity h2 { margin: 0; font-size: 14px; font-weight: 600; color: var(--text-dim); }
.spark { display: grid; grid-auto-flow: column; grid-auto-columns: minmax(4px, 1fr); gap: 4px; align-items: end; height: 64px; }
.spark .bar { background: linear-gradient(180deg, var(--accent-2), var(--accent)); border: 1px solid var(--border-accent); border-radius: 3px; min-height: 2px; box-shadow: 0 6px 14px rgba(91,156,255,.25); }
.spark .bar.dim { opacity: .45; filter: saturate(.75); }

/* Task meta */
.meta { display: block; color: var(--text-dim); font-size: 12px; margin-top: 2px; }

@media (max-width: 640px) {
  .controls { grid-template-columns: 1fr; }
  .search input { width: 100%; }
  .subtitle { display: none; }
}