:root {
  --paper: #F6F5F1;
  --paper-raised: #FFFFFF;
  --ink: #2B2E2E;
  --ink-muted: #6B6F6D;
  --line: #DEDBD3;
  --moss: #5B7B5A;
  --moss-bg: #E7EEE6;
  --amber: #C98A2C;
  --amber-bg: #FBF0DD;
  --danger: #B4453A;
  --radius: 10px;
  --mono: "SFMono-Regular", "JetBrains Mono", Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.4;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
  background: var(--paper-raised);
}

.brand {
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 1.1rem;
}

.user-badge {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--ink-muted);
}

.hidden { display: none !important; }

main#app {
  max-width: 640px;
  margin: 0 auto;
  padding: 24px 16px 80px;
}

.view-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.view-header h2 { margin: 0; }

.back-btn { margin-right: 8px; }

/* Login */
.login-box {
  text-align: center;
  padding: 60px 20px;
}
.login-box h1 { font-size: 2rem; margin-bottom: 4px; }
.muted { color: var(--ink-muted); margin-bottom: 28px; }

/* Buttons */
.btn {
  border: none;
  border-radius: var(--radius);
  padding: 10px 16px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { opacity: 0.88; }
.btn-danger { background: var(--danger); color: white; }
.link-btn {
  background: none;
  border: none;
  color: var(--ink-muted);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0;
}
.link-btn:hover { color: var(--ink); }
.btn-row { display: flex; gap: 10px; }

/* Forms */
.stack-form, .inline-form {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}
.stack-form {
  flex-direction: column;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
}
.stack-form label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ink-muted);
  margin-top: 6px;
}
.stack-form input,
.stack-form textarea,
.stack-form select {
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: var(--sans);
  background: var(--paper);
}

.inline-form input {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 0.95rem;
  background: var(--paper-raised);
}

/* Cards */
.card-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  cursor: pointer;
}
.card:hover { border-color: var(--ink-muted); }

.card-checkbox {
  width: 20px;
  height: 20px;
  margin-top: 2px;
  flex-shrink: 0;
  accent-color: var(--moss);
}

.card-body { flex: 1; min-width: 0; }
.card-title { font-weight: 600; }
.card-title.done { text-decoration: line-through; color: var(--ink-muted); }
.card-desc {
  font-size: 0.85rem;
  color: var(--ink-muted);
  margin-top: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.card-meta {
  display: flex;
  gap: 8px;
  margin-top: 6px;
  flex-wrap: wrap;
}

.tag {
  font-family: var(--mono);
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: 5px;
  background: var(--paper);
  color: var(--ink-muted);
  border: 1px solid var(--line);
}
.tag.due { background: var(--amber-bg); color: var(--amber); border-color: transparent; }
.tag.done-tag { background: var(--moss-bg); color: var(--moss); border-color: transparent; }

.empty-state {
  color: var(--ink-muted);
  text-align: center;
  padding: 40px 0;
  font-size: 0.9rem;
}

/* Sort controls */
.sort-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-size: 0.85rem;
}
.sort-btn {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 5px 10px;
  font-size: 0.82rem;
  cursor: pointer;
  color: var(--ink-muted);
}
.sort-btn.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.group-tag {
  background: var(--paper);
  color: var(--ink-muted);
}

.recur-tag {
  background: #E9EEF5;
  color: #4A6B8A;
  border-color: transparent;
}

.danger-link { color: var(--danger); }
.danger-link:hover { opacity: 0.8; }
.danger-link:disabled {
  color: var(--ink-muted);
  cursor: not-allowed;
  opacity: 0.6;
}
.hint-text {
  font-size: 0.8rem;
  margin-top: -8px;
  margin-bottom: 16px;
}