/* ==========================================
   CLOUDTASKS — Design System
   Paleta: azul medianoche + índigo eléctrico
   + blanco roto + estado de alerta coral
   ========================================== */

:root {
  --bg:          #0f1117;
  --bg-panel:    #171b26;
  --bg-input:    #1e2333;
  --border:      #2a3050;
  --border-soft: #1f263d;

  --indigo:      #5b6ef5;
  --indigo-dim:  #3d4fbd;
  --indigo-glow: rgba(91, 110, 245, 0.18);

  --text:        #e8eaf0;
  --text-muted:  #7a83a6;
  --text-faint:  #3d4460;

  --priority-high:   #f06060;
  --priority-medium: #f5a94e;
  --priority-low:    #50c878;

  --completed-opacity: 0.45;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  --font-body: 'Inter', sans-serif;
  --font-display: 'Syne', sans-serif;

  --transition: 180ms ease;
}

/* RESET & BASE */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* SCROLLBAR */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 99px; }

/* ==========================================
   HEADER
   ========================================== */
.site-header {
  border-bottom: 1px solid var(--border-soft);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-mark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 13px;
  letter-spacing: 0.5px;
  background: var(--indigo);
  color: #fff;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
}

.logo-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
}

.header-stats {
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.stat-sep { color: var(--text-faint); }
.stat-pending { color: var(--priority-medium); }

/* ==========================================
   MAIN LAYOUT
   ========================================== */
.main-layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 24px;
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 24px;
  align-items: start;
}

@media (max-width: 720px) {
  .main-layout { grid-template-columns: 1fr; padding: 16px; }
}

/* ==========================================
   PANEL FORM
   ========================================== */
.panel-form {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: sticky;
  top: 76px;
}

.panel-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--text);
  margin-bottom: 20px;
}

/* FIELDS */
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

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

label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.3px;
}

.required { color: var(--priority-high); }

input[type="text"],
input[type="date"],
textarea,
select {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 14px;
  padding: 9px 12px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  width: 100%;
}

input[type="text"]::placeholder,
textarea::placeholder { color: var(--text-faint); }

input[type="text"]:focus,
input[type="date"]:focus,
textarea:focus,
select:focus {
  border-color: var(--indigo);
  box-shadow: 0 0 0 3px var(--indigo-glow);
}

textarea { resize: vertical; }

select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%237a83a6' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 28px;
  cursor: pointer;
}

.field-error {
  font-size: 11px;
  color: var(--priority-high);
  min-height: 14px;
}

/* BUTTON PRIMARY */
.btn-primary {
  width: 100%;
  padding: 11px;
  background: var(--indigo);
  color: #fff;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
  margin-top: 4px;
}

.btn-primary:hover { background: var(--indigo-dim); }
.btn-primary:active { transform: scale(0.98); }

/* FILTERS */
.filter-section {
  margin-top: 24px;
  border-top: 1px solid var(--border-soft);
  padding-top: 20px;
}

.filter-label {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 10px;
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}

.filter-btn {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 99px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.filter-btn:hover {
  border-color: var(--indigo);
  color: var(--text);
}

.filter-btn.active {
  background: var(--indigo-glow);
  border-color: var(--indigo);
  color: var(--indigo);
}

/* ==========================================
   PANEL LIST
   ========================================== */
.panel-list { min-height: 300px; }

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  text-align: center;
  color: var(--text-muted);
  gap: 12px;
}

.empty-icon {
  font-size: 32px;
  color: var(--text-faint);
  line-height: 1;
}

.empty-state p { font-size: 14px; line-height: 1.7; }

/* TASK LIST */
.task-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* TASK ITEM */
.task-item {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: grid;
  grid-template-columns: 20px 1fr auto;
  gap: 0 14px;
  align-items: start;
  transition: border-color var(--transition), opacity var(--transition);
  position: relative;
  overflow: hidden;
}

.task-item::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
}

.task-item[data-priority="high"]::before   { background: var(--priority-high); }
.task-item[data-priority="medium"]::before { background: var(--priority-medium); }
.task-item[data-priority="low"]::before    { background: var(--priority-low); }

.task-item:hover { border-color: var(--indigo); }

.task-item.completed {
  opacity: var(--completed-opacity);
}

/* Checkbox */
.task-check {
  appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-radius: 4px;
  background: transparent;
  cursor: pointer;
  margin-top: 2px;
  transition: background var(--transition), border-color var(--transition);
  flex-shrink: 0;
}

.task-check:checked {
  background: var(--indigo);
  border-color: var(--indigo);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='8' viewBox='0 0 10 8'%3E%3Cpath fill='none' stroke='%23fff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' d='M1 4l3 3 5-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}

/* Body */
.task-body { min-width: 0; }

.task-title {
  font-weight: 600;
  font-size: 14px;
  color: var(--text);
  line-height: 1.4;
  word-break: break-word;
}

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

.task-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
  word-break: break-word;
}

.task-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
}

.badge {
  font-size: 10px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 99px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-high   { background: rgba(240,96,96,.15);  color: var(--priority-high); }
.badge-medium { background: rgba(245,169,78,.15); color: var(--priority-medium); }
.badge-low    { background: rgba(80,200,120,.15); color: var(--priority-low); }

.task-date {
  font-size: 11px;
  color: var(--text-faint);
}

.task-date.overdue { color: var(--priority-high); }

/* Delete button */
.task-actions { display: flex; align-items: flex-start; padding-top: 1px; }

.btn-delete {
  background: transparent;
  border: none;
  color: var(--text-faint);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-sm);
  font-size: 16px;
  line-height: 1;
  transition: color var(--transition), background var(--transition);
}

.btn-delete:hover {
  color: var(--priority-high);
  background: rgba(240, 96, 96, 0.1);
}

/* ==========================================
   TOAST
   ========================================== */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--bg-panel);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 13px;
  padding: 10px 20px;
  border-radius: 99px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 250ms ease, transform 250ms ease;
  white-space: nowrap;
  z-index: 999;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ==========================================
   FOCUS VISIBLE (accesibilidad)
   ========================================== */
:focus-visible {
  outline: 2px solid var(--indigo);
  outline-offset: 2px;
}

/* REDUCED MOTION */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
}