/* ── Reset & Base ──────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #0d0d0d;
  --surface:   #161616;
  --border:    #2a2a2a;
  --accent:    #c8f135;
  --accent-dim:#8aab1f;
  --text:      #e8e8e8;
  --muted:     #555;
  --danger:    #ff4444;
  --done:      #3a3a3a;
  --done-text: #555;
  --font-display: 'Bebas Neue', sans-serif;
  --font-mono:    'DM Mono', monospace;
  --radius: 4px;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Noise overlay ──────────────────────────────── */
.noise {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 999;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 150px;
}

/* ── Header ──────────────────────────────────────── */
header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13,13,13,0.92);
  backdrop-filter: blur(12px);
}

.header-inner {
  max-width: 680px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-display);
  font-size: 28px;
  letter-spacing: 4px;
  color: var(--text);
}

.dot { color: var(--accent); }

/* Health badge */
.health-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--muted);
  border: 1px solid var(--border);
  padding: 5px 10px;
  border-radius: 2px;
  transition: border-color 0.3s, color 0.3s;
}

.health-badge.ok { border-color: var(--accent); color: var(--accent); }
.health-badge.err { border-color: var(--danger); color: var(--danger); }

.pulse {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--muted);
  display: inline-block;
  transition: background 0.3s;
}

.health-badge.ok .pulse {
  background: var(--accent);
  animation: blink 1.6s ease-in-out infinite;
}

.health-badge.err .pulse { background: var(--danger); }

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.3; }
}

/* ── Main Layout ─────────────────────────────────── */
main {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

/* ── Hero ────────────────────────────────────────── */
.hero {
  padding: 48px 0 24px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}

.hero h1 { display: none; }

.sub {
  font-size: 11px;
  letter-spacing: 3px;
  color: var(--muted);
  text-transform: lowercase;
}

/* ── Input Area ──────────────────────────────────── */
.input-area { margin-bottom: 24px; }

.input-row {
  display: flex;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.2s;
}

.input-row:focus-within { border-color: var(--accent); }

#todoInput {
  flex: 1;
  background: var(--surface);
  border: none;
  outline: none;
  padding: 14px 18px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
  caret-color: var(--accent);
}

#todoInput::placeholder { color: var(--muted); }

#addBtn {
  background: var(--accent);
  color: #0d0d0d;
  border: none;
  padding: 0 20px;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: background 0.15s, transform 0.1s;
}

#addBtn:hover  { background: var(--accent-dim); }
#addBtn:active { transform: scale(0.97); }

#addBtn.loading { opacity: 0.5; pointer-events: none; }

.error-msg {
  font-size: 11px;
  color: var(--danger);
  letter-spacing: 1px;
  margin-top: 8px;
  min-height: 16px;
  opacity: 0;
  transition: opacity 0.2s;
}

.error-msg.visible { opacity: 1; }

/* ── Filters ─────────────────────────────────────── */
.filters {
  display: flex;
  gap: 2px;
  margin-bottom: 24px;
}

.filter-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 2px;
  cursor: pointer;
  border-radius: var(--radius);
  transition: all 0.15s;
}

.filter-btn:hover  { border-color: var(--text); color: var(--text); }
.filter-btn.active { background: var(--accent); border-color: var(--accent); color: #0d0d0d; }

/* ── Todo List ───────────────────────────────────── */
.list-area { min-height: 200px; }

#todoList {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

/* ── Todo Item ───────────────────────────────────── */
.todo-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s, opacity 0.2s, background 0.2s;
  animation: slideIn 0.2s ease-out both;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.todo-item:hover { border-color: #3a3a3a; }

.todo-item.completed {
  background: #111;
  border-color: #1e1e1e;
}

.todo-item.removing {
  opacity: 0;
  transform: translateX(8px);
  transition: all 0.18s ease-in;
}

/* Checkbox */
.check-btn {
  width: 18px; height: 18px;
  border: 1px solid var(--border);
  border-radius: 2px;
  background: none;
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
  color: transparent;
  font-size: 11px;
}

.check-btn:hover { border-color: var(--accent); }

.todo-item.completed .check-btn {
  background: var(--accent);
  border-color: var(--accent);
  color: #0d0d0d;
}

/* Title */
.todo-title {
  flex: 1;
  font-size: 13px;
  color: var(--text);
  letter-spacing: 0.3px;
  word-break: break-word;
}

.todo-item.completed .todo-title {
  color: var(--done-text);
  text-decoration: line-through;
  text-decoration-color: var(--muted);
}

/* Status badge */
.status-badge {
  font-size: 9px;
  letter-spacing: 2px;
  padding: 3px 7px;
  border-radius: 2px;
  text-transform: uppercase;
  flex-shrink: 0;
}

.status-badge.pending   { color: var(--accent); border: 1px solid var(--accent-dim); }
.status-badge.completed { color: var(--muted);  border: 1px solid #2a2a2a; }

/* Delete btn */
.delete-btn {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 2px;
  flex-shrink: 0;
  opacity: 0;
  transition: opacity 0.15s, color 0.15s;
  display: flex;
  align-items: center;
}

.todo-item:hover .delete-btn { opacity: 1; }
.delete-btn:hover { color: var(--danger); }

/* ── States ──────────────────────────────────────── */
.loading-state, .empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 60px 0;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 2px;
}

.hidden { display: none !important; }

.spinner {
  width: 20px; height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.empty-icon {
  font-size: 32px;
  opacity: 0.2;
}

/* ── Stats Bar ───────────────────────────────────── */
.stats-bar {
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--muted);
}

.cache-note { font-style: italic; opacity: 0.6; }

/* ── Scrollbar ───────────────────────────────────── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--muted); }