*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --accent: #6366f1;
  --accent-dark: #4f46e5;
  --bg: #f9fafb;
  --surface: #ffffff;
  --border: #e5e7eb;
  --text: #111827;
  --muted: #6b7280;
  --danger: #ef4444;
  --done-text: #9ca3af;
  --radius: 12px;
  --font: system-ui, -apple-system, sans-serif;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
}

/* ---- Login ---- */

.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  padding: 1rem;
}

.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
  width: 100%;
  max-width: 360px;
}

.login-card .logo {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  display: block;
  text-align: center;
  margin-bottom: 1.5rem;
}

.login-card label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.4rem;
  color: var(--muted);
}

.login-card input[type="password"] {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.15s;
}

.login-card input[type="password"]:focus {
  border-color: var(--accent);
}

.login-card button {
  margin-top: 1rem;
  width: 100%;
  padding: 0.7rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

.login-card button:hover { background: var(--accent-dark); }

.login-card .error {
  margin-top: 0.75rem;
  color: var(--danger);
  font-size: 0.875rem;
  text-align: center;
}

/* ---- App shell ---- */

.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem;
  height: 52px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
}

.logout-btn {
  color: var(--muted);
  text-decoration: none;
  font-size: 1.1rem;
  padding: 0.25rem 0.5rem;
  border-radius: 6px;
  transition: background 0.15s;
}

.logout-btn:hover { background: var(--border); }

.app-main {
  max-width: 640px;
  margin: 0 auto;
  padding: 1rem;
}

/* ---- Add form ---- */

.add-form {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.add-row {
  display: flex;
  gap: 0.5rem;
  align-items: stretch;
}

.add-row input[type="text"] {
  flex: 1;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.15s;
  background: var(--surface);
}

.add-row input[type="text"]:focus { border-color: var(--accent); }

.add-row input[type="date"],
.add-row input[type="time"] {
  padding: 0.65rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.875rem;
  outline: none;
  background: var(--surface);
  color: var(--muted);
}

.add-row input[type="date"] { max-width: 145px; }
.add-row input[type="time"] { max-width: 110px; }

.add-row input[type="date"]:focus,
.add-row input[type="time"]:focus { border-color: var(--accent); }

.add-row input[type="number"] {
  width: 4rem;
  padding: 0.65rem 0.4rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.875rem;
  outline: none;
  background: var(--surface);
  color: var(--muted);
  -moz-appearance: textfield;
}

.add-row input[type="number"]::-webkit-outer-spin-button,
.add-row input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; }

.add-row input[type="number"]:focus { border-color: var(--accent); }

.add-row select {
  padding: 0.65rem 0.4rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.875rem;
  outline: none;
  background: var(--surface);
  color: var(--muted);
  max-width: 100px;
}

.add-row select:focus { border-color: var(--accent); }

.add-row button {
  padding: 0 1rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s;
  flex-shrink: 0;
}

.add-row button:hover { background: var(--accent-dark); }

#new-notes {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.875rem;
  font-family: var(--font);
  outline: none;
  background: var(--surface);
  color: var(--text);
  transition: border-color 0.15s;
}

#new-notes:focus { border-color: var(--accent); }

/* ---- Filter tabs ---- */

.filter-tabs {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 0.75rem;
}

.tab {
  flex: 1;
  padding: 0.45rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ---- Todo list ---- */

.todo-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.todo-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  transition: opacity 0.2s;
}

.todo-item.is-done { opacity: 0.6; }

.todo-check {
  width: 22px;
  height: 22px;
  border: 2px solid var(--border);
  border-radius: 50%;
  flex-shrink: 0;
  cursor: pointer;
  background: transparent;
  transition: background 0.15s, border-color 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.todo-item.is-done .todo-check {
  background: var(--accent);
  border-color: var(--accent);
}

.todo-check-inner {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #fff;
  opacity: 0;
  transition: opacity 0.15s;
}

.todo-item.is-done .todo-check-inner { opacity: 1; }

.todo-body {
  flex: 1;
  min-width: 0;
}

.todo-title {
  font-size: 1rem;
  line-height: 1.4;
  word-break: break-word;
  transition: color 0.15s, text-decoration 0.15s;
}

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

.todo-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.2rem;
  flex-wrap: wrap;
}

.todo-title { cursor: text; }
.todo-item.is-done .todo-title { cursor: default; }

.todo-edit-input {
  width: 100%;
  font-size: 1rem;
  font-family: var(--font);
  border: none;
  border-bottom: 2px solid var(--accent);
  outline: none;
  background: transparent;
  padding: 0;
  line-height: 1.4;
}

.todo-due {
  font-size: 0.78rem;
  color: var(--muted);
}

.todo-due.is-overdue { color: var(--danger); font-weight: 600; }

.todo-notes {
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 0.2rem;
  line-height: 1.4;
  cursor: text;
  white-space: pre-wrap;
  word-break: break-word;
}

.todo-notes.is-empty { color: var(--border); font-style: italic; }
.todo-item.is-done .todo-notes { cursor: default; }

.todo-notes-input {
  display: block;
  width: 100%;
  font-size: 0.82rem;
  font-family: var(--font);
  color: var(--text);
  border: none;
  border-bottom: 2px solid var(--accent);
  outline: none;
  background: transparent;
  padding: 0.1rem 0;
  line-height: 1.4;
  resize: none;
  margin-top: 0.2rem;
}

.todo-recur {
  font-size: 0.72rem;
  color: var(--accent);
  background: #eef2ff;
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
}

.todo-recur:hover { background: #e0e7ff; }

.recur-edit-num {
  width: 3rem;
  font-size: 0.75rem;
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 0.1rem 0.3rem;
  outline: none;
  -moz-appearance: textfield;
}

.recur-edit-num::-webkit-outer-spin-button,
.recur-edit-num::-webkit-inner-spin-button { -webkit-appearance: none; }

.recur-edit-unit {
  font-size: 0.75rem;
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 0.1rem 0.2rem;
  outline: none;
  background: var(--surface);
}

.todo-delete {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--muted);
  font-size: 1.1rem;
  padding: 0.25rem;
  border-radius: 6px;
  line-height: 1;
  transition: color 0.15s, background 0.15s;
  flex-shrink: 0;
}

.todo-delete:hover { color: var(--danger); background: #fef2f2; }

.empty-msg {
  text-align: center;
  color: var(--muted);
  font-size: 0.95rem;
  margin-top: 2rem;
}

/* ---- Undo toast ---- */

.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  background: #1f2937;
  color: #fff;
  padding: 0.75rem 0.75rem 0.75rem 1.1rem;
  border-radius: 10px;
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.9rem;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
  z-index: 100;
  white-space: nowrap;
  animation: toast-in 0.2s ease;
}

.toast-undo {
  background: none;
  border: 1px solid rgba(255,255,255,0.35);
  color: #fff;
  padding: 0.25rem 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  transition: background 0.15s;
}

.toast-undo:hover { background: rgba(255,255,255,0.1); }

.toast-out { animation: toast-out 0.25s ease forwards; }

@keyframes toast-in {
  from { opacity: 0; transform: translateX(-50%) translateY(0.5rem); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

@keyframes toast-out {
  from { opacity: 1; transform: translateX(-50%) translateY(0); }
  to   { opacity: 0; transform: translateX(-50%) translateY(0.5rem); }
}

/* ---- Responsive: hide date/time/recur inputs on small screens ---- */
@media (max-width: 480px) {
  .add-row input[type="date"],
  .add-row input[type="time"],
  .add-row input[type="number"],
  .add-row select { display: none; }
}