/* ==============================================================
   Guía editorial de mantenimiento vehicular — Hoja de estilos
   Paleta editorial neutra con acento naranja
   ============================================================== */

:root {
  --color-primary: #2d3e50;
  --color-primary-dark: #1c2833;
  --color-accent: #e67e22;
  --color-accent-dark: #b35a13;
  --color-secondary: #16a085;
  --color-bg: #ffffff;
  --color-surface: #f8f9fa;
  --color-surface-alt: #ecf0f1;
  --color-text: #212529;
  --color-muted: #6c757d;
  --color-border: #e0e0e0;
  --color-success: #27ae60;
  --color-warning: #c0392b;
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
  --max-width: 1080px;
  --radius: 6px;
  --shadow: 0 2px 4px rgba(0,0,0,0.06);
  --shadow-hover: 0 4px 12px rgba(0,0,0,0.10);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-base);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:hover, a:focus {
  color: var(--color-accent-dark);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 14px;
  padding-bottom: 14px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--color-primary);
  font-weight: 700;
  font-size: 1.05rem;
}

.brand-mark {
  color: var(--color-accent);
  font-size: 1.4rem;
  line-height: 1;
}

.brand-name {
  color: var(--color-primary);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.site-nav a {
  color: var(--color-primary);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  padding: 4px 6px;
  border-radius: 4px;
  transition: background 0.15s;
}

.site-nav a:hover, .site-nav a:focus {
  background: var(--color-surface-alt);
  color: var(--color-accent-dark);
}

/* === HERO === */
.hero {
  background: linear-gradient(135deg, #2d3e50 0%, #34495e 100%);
  color: #ffffff;
  padding: 70px 0 50px;
  border-bottom: 4px solid var(--color-accent);
}

.hero-eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 14px;
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.2;
  margin-bottom: 16px;
  font-weight: 700;
  max-width: 760px;
}

.hero-sub {
  font-size: 1.15rem;
  line-height: 1.55;
  margin-bottom: 22px;
  max-width: 760px;
  color: rgba(255, 255, 255, 0.92);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 26px;
}

.meta-pill {
  display: inline-block;
  background: rgba(255, 255, 255, 0.1);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.86rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.meta-pill strong {
  color: #ffffff;
  font-weight: 600;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 26px;
}

.hero-note {
  background: rgba(0, 0, 0, 0.2);
  border-left: 3px solid var(--color-accent);
  padding: 14px 18px;
  border-radius: 4px;
  font-size: 0.92rem;
  line-height: 1.55;
  max-width: 800px;
  color: rgba(255, 255, 255, 0.88);
}

/* === BUTTONS === */
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.96rem;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.15s;
  text-align: center;
}

.btn-primary {
  background: var(--color-accent);
  color: #ffffff;
  border-color: var(--color-accent);
}

.btn-primary:hover, .btn-primary:focus {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: #ffffff;
}

.btn-secondary {
  background: transparent;
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.6);
}

.btn-secondary:hover, .btn-secondary:focus {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
  border-color: #ffffff;
}

/* === SECTIONS === */
.section {
  padding: 64px 0;
}

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

.section h2 {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  color: var(--color-primary);
  margin-bottom: 18px;
  font-weight: 700;
}

.section-lead {
  font-size: 1.06rem;
  color: var(--color-muted);
  margin-bottom: 30px;
  max-width: 780px;
}

.section p {
  margin-bottom: 14px;
  max-width: 780px;
}

/* === MÓDULOS === */
.modulo {
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 26px;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--color-accent);
}

.modulo-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.modulo-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #ffffff;
  font-weight: 700;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  font-size: 0.95rem;
  flex-shrink: 0;
}

.modulo h3 {
  font-size: 1.32rem;
  color: var(--color-primary);
  font-weight: 700;
  margin: 0;
}

.modulo ul {
  list-style: none;
  margin-bottom: 16px;
}

.modulo ul li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 10px;
  line-height: 1.6;
}

.modulo ul li::before {
  content: "▸";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--color-accent);
  font-weight: 700;
}

.modulo-foot {
  font-size: 0.88rem;
  color: var(--color-muted);
  font-style: italic;
  padding-top: 12px;
  border-top: 1px dashed var(--color-border);
  margin-top: 16px;
  margin-bottom: 0;
}

.check-list li strong {
  color: var(--color-primary);
}

/* === HERRAMIENTAS === */
.tool-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 26px;
  box-shadow: var(--shadow);
}

.tool-card h3 {
  font-size: 1.26rem;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.tool-card > p {
  margin-bottom: 16px;
  color: var(--color-muted);
}

.tool-form .form-row {
  margin-bottom: 16px;
}

.tool-form label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-primary);
  font-size: 0.94rem;
}

.tool-form input[type="number"],
.tool-form select {
  width: 100%;
  padding: 10px 12px;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: inherit;
}

.tool-form input[type="number"]:focus,
.tool-form select:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}

.tool-form button {
  margin-top: 4px;
}

.tool-result {
  margin-top: 22px;
  padding: 18px;
  background: var(--color-surface);
  border-left: 4px solid var(--color-secondary);
  border-radius: 4px;
}

.tool-result h4 {
  color: var(--color-primary);
  margin-bottom: 10px;
  font-size: 1.05rem;
}

.tool-result ul {
  list-style: none;
}

.tool-result li {
  padding: 6px 0;
  border-bottom: 1px dashed var(--color-border);
}

.tool-result li:last-child {
  border-bottom: none;
}

.tool-note {
  font-size: 0.86rem;
  color: var(--color-muted);
  margin-top: 14px;
  font-style: italic;
}

/* === CHECKLIST === */
.checklist {
  list-style: none;
  margin-bottom: 16px;
}

.checklist li {
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
}

.checklist li:last-child {
  border-bottom: none;
}

.checklist label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  cursor: pointer;
  font-size: 0.96rem;
  line-height: 1.5;
}

.checklist input[type="checkbox"] {
  margin-top: 4px;
  width: 18px;
  height: 18px;
  cursor: pointer;
  flex-shrink: 0;
}

.checklist li.checked label {
  color: var(--color-success);
  text-decoration: line-through;
  text-decoration-color: var(--color-success);
  text-decoration-thickness: 1px;
}

.checklist-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

.checklist-controls button {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.checklist-controls button:hover, .checklist-controls button:focus {
  background: var(--color-primary);
  color: #ffffff;
}

.progress-text {
  font-weight: 600;
  color: var(--color-primary);
  font-size: 0.94rem;
}

/* === GLOSARIO === */
.glosario-list {
  margin-top: 20px;
}

.glosario-list dt {
  background: var(--color-bg);
  padding: 14px 18px;
  margin-top: 14px;
  border-radius: var(--radius);
  font-weight: 700;
  color: var(--color-primary);
  border-left: 3px solid var(--color-accent);
  box-shadow: var(--shadow);
}

.glosario-list dt:first-of-type {
  margin-top: 0;
}

.glosario-list dd {
  padding: 6px 18px 12px 22px;
  margin-bottom: 6px;
  color: var(--color-text);
  line-height: 1.6;
}

/* === FAQ === */
.faq-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  box-shadow: var(--shadow);
}

.faq-item summary {
  padding: 16px 22px;
  cursor: pointer;
  font-weight: 600;
  color: var(--color-primary);
  position: relative;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--color-accent);
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item p, .faq-item dd {
  padding: 0 22px 18px;
  line-height: 1.65;
  color: var(--color-text);
}

.faq-item p:not(:last-child),
.faq-item dd:not(:last-child) {
  margin-bottom: 12px;
}

/* === TABLA CUMPLIMIENTO === */
.table-wrap {
  overflow-x: auto;
  margin-top: 20px;
}

.cumple-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-bg);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 0.92rem;
}

.cumple-table th {
  background: var(--color-primary);
  color: #ffffff;
  padding: 12px 14px;
  text-align: left;
  font-weight: 600;
}

.cumple-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.cumple-table tbody tr:nth-child(even) {
  background: var(--color-surface);
}

.cumple-table tbody tr:last-child td {
  border-bottom: none;
}

/* === AUDITORÍA === */
.audit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.audit-block {
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  border-top: 4px solid var(--color-secondary);
}

.audit-block h3 {
  font-size: 1.08rem;
  color: var(--color-primary);
  margin-bottom: 12px;
  font-weight: 700;
}

.audit-block ul {
  list-style: none;
}

.audit-block li {
  padding: 7px 0 7px 22px;
  position: relative;
  font-size: 0.94rem;
  line-height: 1.5;
  border-bottom: 1px dashed var(--color-border);
}

.audit-block li:last-child {
  border-bottom: none;
}

.audit-block li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-secondary);
  font-weight: 700;
}

/* === NOSOTROS === */
.not-list {
  list-style: none;
  margin: 14px 0;
  padding-left: 0;
}

.not-list li {
  padding: 6px 0 6px 22px;
  position: relative;
  line-height: 1.6;
}

.not-list li::before {
  content: "✕";
  position: absolute;
  left: 0;
  color: var(--color-warning);
  font-weight: 700;
}

/* === LEGAL === */
.legal-block {
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 22px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}

.legal-block h3 {
  font-size: 1.12rem;
  color: var(--color-primary);
  margin-bottom: 10px;
  font-weight: 700;
}

.legal-block p, .legal-block ul {
  margin-bottom: 12px;
  line-height: 1.6;
}

.legal-block ul {
  list-style: none;
  padding-left: 0;
}

.legal-block li {
  padding: 4px 0 4px 22px;
  position: relative;
}

.legal-block li::before {
  content: "•";
  position: absolute;
  left: 6px;
  color: var(--color-accent);
  font-weight: 700;
}

.independence-list li {
  padding-left: 24px;
}

.independence-list li::before {
  content: "•";
  left: 8px;
}

/* === FOOTER === */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.86);
  padding: 38px 0 28px;
  font-size: 0.9rem;
  line-height: 1.6;
}

.site-footer strong {
  color: #ffffff;
}

.site-footer a {
  color: var(--color-accent);
}

.site-footer a:hover, .site-footer a:focus {
  color: #ffffff;
}

.site-footer p {
  margin-bottom: 8px;
}

.footer-note {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  font-size: 0.84rem;
  color: rgba(255, 255, 255, 0.7);
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  html {
    scroll-padding-top: 130px;
  }
  .site-header {
    position: static;
  }
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .site-nav {
    width: 100%;
    gap: 8px;
  }
  .site-nav a {
    font-size: 0.86rem;
  }
  .hero {
    padding: 50px 0 36px;
  }
  .section {
    padding: 44px 0;
  }
  .modulo, .tool-card, .legal-block, .audit-block {
    padding: 20px;
  }
  .modulo h3 {
    font-size: 1.18rem;
  }
  .cumple-table {
    font-size: 0.86rem;
  }
  .cumple-table th, .cumple-table td {
    padding: 8px 10px;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }
  .hero h1 {
    font-size: 1.6rem;
  }
  .hero-sub {
    font-size: 1rem;
  }
  .btn {
    width: 100%;
    padding: 12px 16px;
  }
  .checklist label {
    font-size: 0.92rem;
  }
}

/* === UTILIDADES === */
.placeholder {
  background: rgba(230, 126, 34, 0.15);
  border: 1px dashed var(--color-accent);
  padding: 0 4px;
  border-radius: 3px;
  font-style: italic;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}