/* ============================================================
   BASE.CSS — Reset, Layout, Componentes, Variables por defecto
   ============================================================ */

/* --- CSS Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { min-height: 100vh; }
img, svg { display: block; max-width: 100%; }
ul, ol { list-style: none; }
a { text-decoration: none; color: inherit; }
button { cursor: pointer; font: inherit; border: none; background: none; }
input, select, textarea { font: inherit; }
fieldset { border: none; }

/* --- Default CSS Variables (Minimal + Blue) --- */
:root {
  /* Colors — overridden by palettes */
  --color-primary:           #2563eb;
  --color-primary-light:     #dbeafe;
  --color-primary-dark:      #1d4ed8;
  --color-secondary:         #f59e0b;
  --color-background:        #ffffff;
  --color-surface:           #f8fafc;
  --color-text:              #0f172a;
  --color-text-muted:        #64748b;
  --color-border:            #e2e8f0;
  --color-success:           #16a34a;
  --color-warning:           #d97706;
  --color-danger:            #dc2626;
  --color-hero-overlay:      rgba(15, 23, 42, 0.45);

  /* Typography — overridden by themes */
  --font-family-base:        'Inter', system-ui, -apple-system, sans-serif;
  --font-family-heading:     'Inter', system-ui, -apple-system, sans-serif;
  --font-weight-heading:     600;
  --font-weight-base:        400;

  /* Spacing — overridden by themes */
  --spacing-section:         5rem;
  --spacing-element:         1.5rem;
  --container-max:           1200px;
  --container-padding:       1.5rem;

  /* Borders — overridden by themes */
  --border-radius-sm:        0.25rem;
  --border-radius-md:        0.5rem;
  --border-radius-lg:        1rem;

  /* Shadows — overridden by themes */
  --shadow-sm:               0 1px 2px rgba(0,0,0,0.05);
  --shadow-md:               0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg:               0 10px 25px rgba(0,0,0,0.1);

  /* Buttons — overridden by themes */
  --btn-padding-x:           1.25rem;
  --btn-padding-y:           0.625rem;
  --btn-font-weight:         500;
  --btn-transition:          150ms ease;

  /* Cards — overridden by themes */
  --card-padding:            1.5rem;
  --card-gap:                1.5rem;

  /* Misc — overridden by themes */
  --transition-speed:        200ms;
  --header-height:           4rem;
  --letter-spacing:          normal;
  --line-height:             1.6;
}

/* ============================================================
   UTILITY & LAYOUT
   ============================================================ */

body {
  font-family: var(--font-family-base);
  font-weight: var(--font-weight-base);
  font-size: 1rem;
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-background);
  letter-spacing: var(--letter-spacing);
  transition: background-color 0.3s, color 0.3s;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--spacing-section) 0;
}

.section-alt {
  background-color: var(--color-surface);
}

.section-title {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-heading);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  margin-bottom: 0.5rem;
  color: var(--color-text);
  letter-spacing: var(--letter-spacing);
}

.section-subtitle {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  margin-bottom: 2.5rem;
}

.subsection-title {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-heading);
  font-size: 1.25rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-border);
  color: var(--color-text);
}

/* --- Grid --- */
.grid { display: grid; gap: var(--card-gap); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 900px) {
  .grid-4, .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

/* ============================================================
   HEADER
   ============================================================ */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  transition: background-color 0.3s, border-color 0.3s;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-family: var(--font-family-heading);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.nav-list {
  display: flex;
  gap: 2rem;
}

.nav-list a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-speed);
}

.nav-list a:hover { color: var(--color-primary); }

@media (max-width: 768px) {
  .nav { display: none; }
}

/* ============================================================
   BREADCRUMBS
   ============================================================ */

.breadcrumbs {
  padding: 1rem var(--container-padding);
}

.breadcrumbs ol {
  display: flex;
  gap: 0.5rem;
  font-size: 0.85rem;
}

.breadcrumbs li:not(:last-child)::after {
  content: '/';
  margin-left: 0.5rem;
  color: var(--color-text-muted);
}

.breadcrumbs a { color: var(--color-text-muted); }
.breadcrumbs a:hover { color: var(--color-primary); }
.breadcrumbs [aria-current] { color: var(--color-text); font-weight: 500; }

/* ============================================================
   HERO
   ============================================================ */

.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 500px;
  background: var(--color-primary) url('https://picsum.photos/seed/hero/1600/800') center/cover no-repeat;
  color: #fff;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: var(--color-hero-overlay);
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 700px;
  padding: 4rem 1.5rem;
}

.hero-title {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-heading);
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  margin-bottom: 1rem;
  line-height: 1.15;
  letter-spacing: var(--letter-spacing);
}

.hero-subtitle {
  font-size: 1.2rem;
  opacity: 0.9;
  margin-bottom: 2rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================================
   CARDS
   ============================================================ */

.card {
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition-speed), transform var(--transition-speed), border-color var(--transition-speed), background-color 0.3s;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-img {
  overflow: hidden;
}

.card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-speed);
}

.card:hover .card-img img { transform: scale(1.05); }

.card-body {
  padding: var(--card-padding);
}

.card-body h3 {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-heading);
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
  color: var(--color-text);
}

.card-body p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

/* Category cards */
.card-category .card-img { height: 200px; }

/* Product cards */
.card-product .card-img { height: 260px; }
.card-product .price {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1rem;
}
.card-product .price small {
  font-weight: 400;
  color: var(--color-text-muted);
  text-decoration: line-through;
  margin-left: 0.5rem;
  font-size: 0.9rem;
}

/* Benefit cards */
.card-benefit {
  text-align: center;
  padding: 2.5rem var(--card-padding);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  background: var(--color-background);
  transition: background-color 0.3s;
}
.card-benefit .card-icon {
  display: flex;
  justify-content: center;
  margin-bottom: 1rem;
  color: var(--color-primary);
}
.card-benefit h3 { margin-bottom: 0.75rem; }
.card-benefit:hover { box-shadow: var(--shadow-md); transform: none; }

/* Testimonial cards */
.card-testimonial {
  padding: var(--card-padding);
  border-radius: var(--border-radius-md);
  background: var(--color-background);
  font-style: italic;
}
.card-testimonial:hover { box-shadow: var(--shadow-md); transform: none; }
.card-testimonial .card-body > p { font-size: 1rem; margin-bottom: 1.5rem; }
.card-testimonial footer { font-style: normal; }
.card-testimonial footer strong { display: block; color: var(--color-text); margin-bottom: 0.15rem; }
.card-testimonial footer span { color: var(--color-text-muted); font-size: 0.85rem; }

/* Badge */
.badge {
  display: inline-block;
  padding: 0.2em 0.65em;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 100px;
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  margin-bottom: 0.5rem;
}

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: var(--btn-padding-y) var(--btn-padding-x);
  font-weight: var(--btn-font-weight);
  font-size: 0.9rem;
  line-height: 1.4;
  border-radius: var(--border-radius-sm);
  transition: all var(--btn-transition);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #fff;
}
.btn-primary:hover { background-color: var(--color-primary-dark); }

.btn-secondary {
  background-color: var(--color-secondary);
  color: #fff;
}
.btn-secondary:hover { opacity: 0.9; }

.btn-outline {
  border: 2px solid var(--color-border);
  color: var(--color-text);
  background: transparent;
}
.btn-outline:hover { border-color: var(--color-primary); color: var(--color-primary); }

.btn-ghost {
  color: var(--color-text-muted);
}
.btn-ghost:hover { color: var(--color-primary); background-color: var(--color-primary-light); }

.btn-sm { padding: 0.35rem 0.85rem; font-size: 0.8rem; }
.btn-lg { padding: 0.85rem 2rem; font-size: 1.05rem; }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-reset {
  margin-top: 1.5rem;
  padding: 0.6rem 1rem;
  width: 100%;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  background: var(--color-background);
  transition: all var(--transition-speed);
}
.btn-reset:hover {
  color: var(--color-danger);
  border-color: var(--color-danger);
}

/* ============================================================
   FORMS
   ============================================================ */

.form-group {
  margin-bottom: 1rem;
}

.label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.35rem;
  color: var(--color-text);
}

.input, .select {
  width: 100%;
  padding: 0.6rem 0.85rem;
  font-size: 0.9rem;
  color: var(--color-text);
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  transition: border-color var(--transition-speed), box-shadow var(--transition-speed), background-color 0.3s;
}

.input:focus, .select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.input::placeholder { color: var(--color-text-muted); }

.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 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.85rem center;
  padding-right: 2.5rem;
}

.checkbox, .radio {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
  color: var(--color-text);
  cursor: pointer;
}

.checkbox input, .radio input {
  accent-color: var(--color-primary);
  width: 1rem;
  height: 1rem;
}

/* Newsletter */
.newsletter-box {
  text-align: center;
  max-width: 500px;
  margin: 0 auto;
}

.newsletter-form {
  display: flex;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.newsletter-form .input { flex: 1; }

@media (max-width: 500px) {
  .newsletter-form { flex-direction: column; }
}

/* ============================================================
   ALERTS
   ============================================================ */

.alert {
  padding: 1rem 1.25rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
  border-left: 4px solid;
}

.alert-success {
  background-color: #dcfce7;
  color: #166534;
  border-color: var(--color-success);
}
.alert-warning {
  background-color: #fef3c7;
  color: #92400e;
  border-color: var(--color-warning);
}
.alert-error {
  background-color: #fee2e2;
  color: #991b1b;
  border-color: var(--color-danger);
}
.alert-info {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  border-color: var(--color-primary);
}

/* ============================================================
   MODAL
   ============================================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.5);
  padding: 1rem;
}

.modal-overlay[hidden] {
  display: none;
}

.modal {
  background: var(--color-background);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  animation: modalIn 0.2s ease;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95) translateY(-10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.modal-header h3 {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-heading);
  font-size: 1.15rem;
  color: var(--color-text);
}

.btn-close {
  font-size: 1.5rem;
  color: var(--color-text-muted);
  line-height: 1;
}

.btn-close:hover { color: var(--color-text); }

.modal-body {
  padding: 1.5rem;
  color: var(--color-text);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--color-border);
}

/* ============================================================
   TABS
   ============================================================ */

.tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: 1.5rem;
}

.tab {
  padding: 0.75rem 1.5rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color var(--transition-speed), border-color var(--transition-speed);
}

.tab:hover { color: var(--color-text); }
.tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-content {
  padding: 1rem 0;
  color: var(--color-text);
  line-height: 1.7;
}

/* ============================================================
   ACCORDION
   ============================================================ */

.accordion {
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  overflow: hidden;
}

.accordion-item {
  border-bottom: 1px solid var(--color-border);
}

.accordion-item:last-child { border-bottom: none; }

.accordion-trigger {
  padding: 1rem 1.25rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: color var(--transition-speed), background-color var(--transition-speed);
}

.accordion-trigger:hover { color: var(--color-primary); }

.accordion-trigger::-webkit-details-marker { display: none; }

.accordion-trigger::after {
  content: '+';
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--color-text-muted);
  transition: transform var(--transition-speed);
}

.accordion-item[open] .accordion-trigger::after {
  content: '−';
}

.accordion-content {
  padding: 0 1.25rem 1.25rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ============================================================
   FOOTER
   ============================================================ */

.footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 3rem 0 1.5rem;
  transition: background-color 0.3s;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-col h4 {
  font-family: var(--font-family-heading);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.footer-col p { color: var(--color-text-muted); font-size: 0.9rem; }

.footer-col ul li { margin-bottom: 0.5rem; }

.footer-col ul li a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  transition: color var(--transition-speed);
}

.footer-col ul li a:hover { color: var(--color-primary); }

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.social-links a {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  transition: color var(--transition-speed);
}

.social-links a:hover { color: var(--color-primary); }

.footer-bottom {
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 500px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   COMPONENT SHOWCASE HELPERS
   ============================================================ */

.component-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.component-col {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-width: 600px;
}

.form-demo {
  max-width: 500px;
}

/* ============================================================
   CONTROLS PANEL
   ============================================================ */

.controls-panel {
  position: fixed;
  top: 5rem;
  right: 0;
  z-index: 150;
  display: flex;
}

.controls-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-right: none;
  border-radius: var(--border-radius-md) 0 0 var(--border-radius-md);
  color: var(--color-text);
  box-shadow: var(--shadow-md);
  transition: background-color 0.3s, color 0.3s;
}

.controls-toggle:hover { color: var(--color-primary); }

.controls-content {
  display: none;
  width: 260px;
  max-height: 80vh;
  overflow-y: auto;
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-right: none;
  padding: 1.25rem;
  box-shadow: var(--shadow-lg);
  transition: background-color 0.3s;
}

.controls-panel.open .controls-content { display: block; }

.controls-content h3 {
  font-family: var(--font-family-heading);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
  margin-top: 1rem;
  color: var(--color-text);
}

.controls-content h3:first-child { margin-top: 0; }

.control-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.control-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.5rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

.control-option:hover { background: var(--color-surface); color: var(--color-text); }
.control-option.active {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  font-weight: 500;
}

.control-option input { display: none; }

@media (max-width: 768px) {
  .controls-content { width: 220px; }
}