/* =============================================================
   COTIZADOR DE LIBROS — Perfect Print
   Sistema de diseño: minimalista, profesional, para diseñadores
   Paleta: azul corporativo (#1e3a8a), gris (#1f2937), naranja CTA (#ea580c)
   ============================================================= */

:root {
  /* Colores */
  --color-primary: #1e3a8a;
  --color-primary-dark: #172554;
  --color-primary-light: #3b5cb8;
  --color-accent: #ea580c;
  --color-accent-dark: #c2410c;

  --color-text: #1f2937;
  --color-text-soft: #4b5563;
  --color-text-muted: #6b7280;

  --color-bg: #ffffff;
  --color-bg-soft: #f9fafb;
  --color-bg-alt: #f3f4f6;
  --color-border: #e5e7eb;
  --color-border-strong: #d1d5db;

  --color-success: #16a34a;
  --color-success-bg: #f0fdf4;
  --color-error: #dc2626;
  --color-error-bg: #fef2f2;
  --color-warning: #d97706;
  --color-info-bg: #eff6ff;

  /* Tipografía */
  --font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.5rem;
  --text-5xl: 3.25rem;

  /* Espaciado (base 8px) */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 2.5rem;
  --space-6: 3rem;
  --space-8: 4rem;
  --space-10: 5rem;

  /* Bordes y sombras */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 32px rgba(30,58,138,0.10), 0 4px 12px rgba(0,0,0,0.04);

  /* Transiciones */
  --t-fast: 120ms ease;
  --t-base: 200ms ease;
}

/* =================== RESET BÁSICO =================== */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.55;
}
h1, h2, h3, h4 { color: var(--color-text); line-height: 1.2; margin: 0 0 var(--space-2); font-weight: 700; }
h1 { font-size: var(--text-4xl); letter-spacing: -0.02em; }
h2 { font-size: var(--text-3xl); letter-spacing: -0.015em; }
h3 { font-size: var(--text-xl); }
p  { margin: 0 0 var(--space-2); color: var(--color-text-soft); }
a  { color: var(--color-primary); text-decoration: none; transition: color var(--t-fast); }
a:hover { color: var(--color-primary-dark); }
strong { font-weight: 600; }
em { font-style: italic; }
.muted { color: var(--color-text-muted); }
.small { font-size: var(--text-sm); }
.accent { color: var(--color-accent); }
.eyebrow {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  background: var(--color-info-bg);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: var(--space-2);
}

/* =================== CONTAINER =================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-3);
}
.container-narrow {
  max-width: 820px;
}

/* =================== HEADER =================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-text);
}
.logo:hover { color: var(--color-primary); }
.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 800;
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
}
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.site-nav a {
  color: var(--color-text-soft);
  font-weight: 500;
  font-size: var(--text-sm);
}
.site-nav a:hover { color: var(--color-primary); }
.nav-cart {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.cart-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  padding: 0 6px;
  background: var(--color-accent);
  color: #fff;
  border-radius: 999px;
  font-size: var(--text-xs);
  font-weight: 700;
}

/* =================== HERO =================== */
.view-landing { padding: var(--space-8) 0 var(--space-10); }
.hero {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-6);
  align-items: center;
}
.hero h1 { font-size: var(--text-5xl); margin-bottom: var(--space-3); }
.hero-lead { font-size: var(--text-lg); max-width: 540px; margin-bottom: var(--space-4); }
.hero-actions { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.hero-visual { display: flex; justify-content: center; }
.hero-card {
  width: 100%;
  max-width: 380px;
  background: linear-gradient(180deg, #fff, var(--color-bg-soft));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  box-shadow: var(--shadow-lg);
}
.hero-card-row {
  display: flex;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
}
.hero-card-row span { color: var(--color-text-muted); }
.hero-card-total {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: 2px solid var(--color-primary);
}
.hero-card-total span { color: var(--color-text-soft); font-weight: 500; }
.hero-card-total strong { font-size: var(--text-2xl); color: var(--color-primary); }

/* =================== FEATURES =================== */
.features { margin-top: var(--space-10); text-align: center; }
.features h2 { margin-bottom: var(--space-5); }
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  text-align: left;
}
.feature {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
}
.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-md);
  font-weight: 700;
  margin-bottom: var(--space-2);
}
.feature h3 { margin-bottom: 6px; }
.feature p { margin: 0; font-size: var(--text-sm); }

/* =================== VIEWS GENERALES =================== */
.view {
  min-height: calc(100vh - 68px - 120px);
  padding: var(--space-5) 0 var(--space-8);
}
.cotizador-header {
  margin-bottom: var(--space-4);
}
.cotizador-header h1 {
  font-size: var(--text-3xl);
  margin-bottom: 8px;
}

/* =================== STEPS =================== */
.steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  list-style: none;
  margin: 0 0 var(--space-4);
  padding: 0;
}
.steps.steps-3 { grid-template-columns: repeat(3, 1fr); }
.step {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 500;
  position: relative;
  transition: all var(--t-base);
}
.step span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-border-strong);
  color: #fff;
  font-size: var(--text-xs);
  font-weight: 700;
  flex-shrink: 0;
}
.step.is-active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}
.step.is-active span { background: #fff; color: var(--color-primary); }
.step.is-completed {
  background: var(--color-success-bg);
  border-color: var(--color-success);
  color: var(--color-success);
}
.step.is-completed span { background: var(--color-success); color: #fff; }

/* =================== STEP PANELS =================== */
.step-panel {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  padding: var(--space-4);
  margin: 0;
  box-shadow: var(--shadow-sm);
}
.step-panel[hidden] { display: none; }
.step-panel legend {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  padding: 0 8px;
  margin-left: -8px;
}

/* =================== CAMPOS / FORM =================== */
.field {
  margin-bottom: var(--space-3);
}
.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
}
.field label {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
  font-size: var(--text-sm);
  color: var(--color-text);
}
.field input[type="text"],
.field input[type="email"],
.field input[type="tel"],
.field input[type="number"],
.field select,
.field textarea {
  width: 100%;
  padding: 12px 14px;
  font-family: inherit;
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
  appearance: none;
}
.field select {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><path fill='%231f2937' d='M6 8L0 0h12z'/></svg>");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 38px;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(30,58,138,0.12);
}
.field input:invalid:not(:placeholder-shown) {
  border-color: var(--color-error);
}
.field .help {
  margin: 6px 0 0;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.field .help.is-error {
  color: var(--color-error);
}

/* Radio cards (grid) */
.radio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}
.radio-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 14px 16px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  cursor: pointer;
  transition: all var(--t-fast);
}
.radio-card:hover {
  border-color: var(--color-primary);
  background: var(--color-info-bg);
}
.radio-card input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.radio-card input:checked + .radio-card-content {
  color: var(--color-primary);
}
.radio-card:has(input:checked) {
  border-color: var(--color-primary);
  background: var(--color-info-bg);
  box-shadow: 0 0 0 1px var(--color-primary);
}
.radio-card-title {
  font-weight: 600;
  font-size: var(--text-sm);
  margin-bottom: 2px;
}
.radio-card-desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* =================== BOTONES =================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--t-fast);
  text-decoration: none;
  user-select: none;
}
.btn:disabled, .btn[disabled] {
  opacity: 0.55;
  cursor: not-allowed;
}
.btn-lg { padding: 14px 24px; font-size: var(--text-base); }
.btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.btn-primary:hover:not(:disabled) {
  background: var(--color-accent-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-border-strong);
}
.btn-ghost:hover:not(:disabled) {
  background: var(--color-bg-alt);
  border-color: var(--color-primary);
}
.btn-danger {
  background: transparent;
  color: var(--color-error);
  border-color: var(--color-border);
  padding: 6px 12px;
  font-size: var(--text-xs);
}
.btn-danger:hover:not(:disabled) {
  background: var(--color-error-bg);
  border-color: var(--color-error);
}

.step-actions {
  display: flex;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: var(--space-3);
  flex-wrap: wrap;
}

/* =================== RESUMEN (en cotizador y checkout) =================== */
.resumen {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin-bottom: var(--space-3);
}
.resumen-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  font-size: var(--text-sm);
  border-bottom: 1px solid var(--color-border);
}
.resumen-row:last-child { border-bottom: none; }
.resumen-row span { color: var(--color-text-muted); }
.resumen-row strong { color: var(--color-text); font-weight: 600; }

/* =================== PRECIO BOX =================== */
.precio-box {
  background: linear-gradient(180deg, #fff, var(--color-bg-soft));
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin-bottom: var(--space-3);
}
.precio-loading {
  text-align: center;
  padding: var(--space-3);
  color: var(--color-text-muted);
  font-style: italic;
}
.precio-error {
  padding: var(--space-2);
  background: var(--color-error-bg);
  border: 1px solid var(--color-error);
  border-radius: var(--radius-sm);
  color: var(--color-error);
  font-size: var(--text-sm);
}
.precio-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  font-size: var(--text-sm);
  color: var(--color-text-soft);
}
.precio-row.precio-total {
  font-size: var(--text-xl);
  color: var(--color-primary);
  font-weight: 700;
  padding-top: var(--space-2);
  margin-top: var(--space-1);
  border-top: 2px solid var(--color-primary);
}
.precio-total strong { font-size: var(--text-2xl); }
.precio-unitario {
  margin: var(--space-2) 0 0;
  text-align: center;
  font-size: var(--text-sm);
  color: var(--color-text-soft);
}

/* =================== CART =================== */
.cart-items { margin-bottom: var(--space-3); }
.cart-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-2);
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin-bottom: var(--space-2);
}
.cart-item-info { flex: 1; min-width: 0; }
.cart-item-title {
  font-weight: 600;
  font-size: var(--text-base);
  margin-bottom: 4px;
}
.cart-item-specs {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}
.cart-item-specs span::after { content: " ·"; margin-left: 4px; }
.cart-item-specs span:last-child::after { content: ""; }
.cart-item-aside {
  text-align: right;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
}
.cart-item-price {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
}
.cart-summary {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin-bottom: var(--space-3);
}
.cart-summary-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  font-size: var(--text-sm);
}
.cart-summary-row.cart-summary-total {
  border-top: 2px solid var(--color-primary);
  margin-top: var(--space-1);
  padding-top: var(--space-2);
  font-size: var(--text-xl);
  color: var(--color-primary);
}
.cart-summary-total strong { font-size: var(--text-2xl); font-weight: 700; }

/* =================== EMPTY STATE =================== */
.empty-state {
  text-align: center;
  padding: var(--space-8) var(--space-3);
  background: var(--color-bg-soft);
  border: 2px dashed var(--color-border-strong);
  border-radius: var(--radius-lg);
}
.empty-state h2 { color: var(--color-text-soft); margin-bottom: 8px; }
.empty-state p { margin-bottom: var(--space-3); }

/* =================== ALERTAS =================== */
.alert {
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  margin-bottom: var(--space-2);
  border: 1px solid;
}
.alert-error {
  background: var(--color-error-bg);
  border-color: var(--color-error);
  color: var(--color-error);
}
.alert-success {
  background: var(--color-success-bg);
  border-color: var(--color-success);
  color: var(--color-success);
}
.info-box {
  background: var(--color-info-bg);
  border-left: 4px solid var(--color-primary);
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-text-soft);
  margin-bottom: var(--space-3);
}

/* =================== SUCCESS SCREEN =================== */
.success-screen {
  text-align: center;
  padding: var(--space-6) var(--space-3);
}
.success-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--color-success);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  margin-bottom: var(--space-3);
  box-shadow: 0 8px 24px rgba(22,163,74,0.25);
}
.success-card {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  max-width: 480px;
  margin: var(--space-3) auto;
  text-align: left;
}
.success-row {
  display: flex;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}
.success-row:last-child { border-bottom: none; }
.success-row span { color: var(--color-text-muted); font-size: var(--text-sm); }
.success-row strong { color: var(--color-text); }

/* =================== FOOTER =================== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-4) 0;
  margin-top: var(--space-6);
  background: var(--color-bg-soft);
}
.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* =================== RESPONSIVE =================== */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
  .hero h1 { font-size: var(--text-4xl); }
  .features-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  :root {
    --text-4xl: 1.875rem;
    --text-5xl: 2.25rem;
  }
  .header-inner { height: 56px; }
  .logo-text { display: none; }
  .site-nav { gap: var(--space-2); }
  .site-nav a:not(.nav-cart) { display: none; }
  .container { padding: 0 var(--space-2); }
  .step-panel { padding: var(--space-3); }

  .steps {
    grid-template-columns: repeat(5, 1fr);
    gap: 4px;
  }
  .step {
    padding: 10px 6px;
    font-size: 0;
    justify-content: center;
  }
  .step span {
    font-size: var(--text-xs);
  }
  .steps.steps-3 { grid-template-columns: repeat(3, 1fr); }

  .field-row { grid-template-columns: 1fr; }
  .step-actions { flex-direction: column-reverse; }
  .step-actions .btn { width: 100%; }

  .cart-item { flex-direction: column; }
  .cart-item-aside { align-items: flex-start; flex-direction: row; width: 100%; justify-content: space-between; }
}