/* Tema claro (por defecto) */
:root {
  color-scheme: light;
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1f2933;
  --muted: #6b7280;
  --border: #e2e5ea;
  --input-bg: #ffffff;
  --hover: #eef0f3;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --on-primary: #ffffff;
  --danger: #dc2626;
  --danger-border: #f3c2c2;
  --danger-hover: #fdecec;
  --pending: #f59e0b;
  --progress: #3b82f6;
  --done: #16a34a;
}

/* Tema oscuro: sigue al sistema salvo que el usuario elija claro */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0f1115;
    --card: #181b21;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: #2b3039;
    --input-bg: #12151a;
    --hover: #232831;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --on-primary: #ffffff;
    --danger: #f87171;
    --danger-border: #7f1d1d;
    --danger-hover: #2a1515;
    --pending: #fbbf24;
    --progress: #60a5fa;
    --done: #4ade80;
  }
}

/* Tema oscuro elegido manualmente */
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1115;
  --card: #181b21;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --border: #2b3039;
  --input-bg: #12151a;
  --hover: #232831;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --on-primary: #ffffff;
  --danger: #f87171;
  --danger-border: #7f1d1d;
  --danger-hover: #2a1515;
  --pending: #fbbf24;
  --progress: #60a5fa;
  --done: #4ade80;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background-color .2s, color .2s;
}

h1, h2 { margin: 0 0 12px; }
h2 { font-size: 1.1rem; }

.hidden { display: none !important; }
.muted { color: var(--muted); }
.error { color: var(--danger); min-height: 1.2em; margin: 4px 0; font-size: .9rem; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}

label { display: block; font-size: .9rem; font-weight: 500; margin-bottom: 12px; }

input, textarea, select {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 9px 10px;
  font: inherit;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--input-bg);
  color: var(--text);
}
::placeholder { color: var(--muted); opacity: 1; }
input:focus, textarea:focus, select:focus { outline: 2px solid var(--primary); outline-offset: -1px; }

.row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.btn {
  font: inherit;
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn.primary { background: var(--primary); color: var(--on-primary); }
.btn.primary:hover { background: var(--primary-hover); }
.btn.ghost { background: transparent; border-color: var(--border); color: var(--text); }
.btn.ghost:hover { background: var(--hover); }
.btn.danger { background: transparent; color: var(--danger); border-color: var(--danger-border); }
.btn.danger:hover { background: var(--danger-hover); }

/* Botón de tema */
.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; padding: 0;
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--card); color: var(--text); cursor: pointer;
}
.theme-toggle:hover { background: var(--hover); }
.theme-toggle:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.theme-toggle svg { width: 18px; height: 18px; }
/* Muestra la luna en modo claro (para pasar a oscuro) y el sol en modo oscuro */
.theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}
.auth-theme { position: fixed; top: 16px; right: 16px; }
.btn.small { padding: 4px 10px; font-size: .85rem; }

.link { background: none; border: none; color: var(--primary); cursor: pointer; font: inherit; padding: 0; }

.actions { display: flex; gap: 8px; }

/* Auth */
.auth { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 16px; }
.auth-card { width: 100%; max-width: 380px; }
.auth-logo { display: block; margin: 0 auto 12px; }
.auth-card h1 { text-align: center; }
#auth-subtitle { text-align: center; margin-top: 0; }
.auth-card .btn { width: 100%; }
.switch { text-align: center; margin: 16px 0 0; font-size: .9rem; }

/* App */
.topbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 24px; background: var(--card); border-bottom: 1px solid var(--border);
}
.topbar h1 { margin: 0; font-size: 1.3rem; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand img { display: block; }
.user { display: flex; align-items: center; gap: 12px; }

.container { max-width: 760px; margin: 24px auto; padding: 0 16px; }

.filters { display: flex; gap: 8px; flex-wrap: wrap; margin: 20px 0 12px; }
.chip {
  font: inherit; font-size: .85rem; padding: 6px 12px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--card); color: var(--text); cursor: pointer;
}
.chip:hover { background: var(--hover); }
.chip.active { background: var(--primary); border-color: var(--primary); color: var(--on-primary); }

.task-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.task {
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
  padding: 14px 16px; border-left: 4px solid var(--pending);
}
.task.en_progreso { border-left-color: var(--progress); }
.task.completada { border-left-color: var(--done); }
.task.completada .task-title { text-decoration: line-through; color: var(--muted); }

.task-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.task-title { font-weight: 600; margin: 0; word-break: break-word; }
.task-desc { margin: 6px 0 0; color: var(--muted); white-space: pre-wrap; word-break: break-word; }
.task-meta { margin-top: 10px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: .85rem; }
.task-meta select { width: auto; margin: 0; padding: 4px 8px; font-size: .85rem; }
.task-buttons { display: flex; gap: 6px; flex-shrink: 0; }
.overdue { color: var(--danger); font-weight: 500; }
.empty { text-align: center; padding: 24px 0; }

@media (max-width: 560px) {
  .row { grid-template-columns: 1fr; }
  .topbar { padding: 12px 16px; }
  .task-head { flex-direction: column; }
}