/* System Optimizer — identidad visual independiente */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:ital,wght@0,300;0,400;0,500;0,600;1,400&family=IBM+Plex+Serif:ital,wght@0,400;0,500;0,600;1,400&display=swap');

:root {
  --so-bg: #f7f6f3;
  --so-bg-alt: #eeede8;
  --so-surface: #ffffff;
  --so-text: #1c1c1a;
  --so-text-muted: #5c5c58;
  --so-text-light: #8a8a85;
  --so-accent: #001d4a;
  --so-accent-soft: #002855;
  --so-border: #dddcd6;
  --so-border-light: #eae9e3;
  --so-max: 720px;
  --so-wide: 960px;
  --so-serif: 'IBM Plex Serif', Georgia, 'Times New Roman', serif;
  --so-sans: 'IBM Plex Sans', system-ui, sans-serif;
  --so-space-xs: 0.5rem;
  --so-space-sm: 1rem;
  --so-space-md: 2rem;
  --so-space-lg: 4rem;
  --so-space-xl: 6rem;
  --so-radius: 2px;
  --so-transition: 0.2s ease;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  font-size: 17px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  font-family: var(--so-sans);
  font-weight: 400;
  line-height: 1.65;
  color: var(--so-text);
  background: var(--so-bg);
}

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

a {
  color: var(--so-accent);
  text-decoration: none;
  transition: color var(--so-transition);
}

a:hover { color: var(--so-accent-soft); }

/* ── Layout ── */

.so-wrap {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.so-main {
  flex: 1;
}

.so-container {
  width: min(100% - 2.5rem, var(--so-max));
  margin-inline: auto;
}

.so-container--wide {
  width: min(100% - 2.5rem, var(--so-wide));
}

/* ── Header / Nav ── */

.so-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(247, 246, 243, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--so-border-light);
}

.so-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--so-space-sm);
  padding: 1.1rem 0;
  width: min(100% - 2.5rem, var(--so-wide));
  margin-inline: auto;
}

.so-brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--so-text);
  flex-shrink: 0;
}

.so-brand:hover { color: var(--so-text); opacity: 0.88; }

.so-brand__logo {
  display: block;
  height: 2.35rem;
  width: auto;
  max-width: min(36vw, 9rem);
  object-fit: contain;
  object-position: left center;
  flex-shrink: 0;
}

.so-brand__mark {
  font-family: var(--so-sans);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--so-accent);
  line-height: 1.2;
  white-space: nowrap;
}

.so-brand__name {
  font-family: var(--so-serif);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.so-brand__tag {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--so-text-light);
}

.so-nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--so-border);
  padding: 0.45rem 0.65rem;
  font-family: var(--so-sans);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  color: var(--so-text-muted);
}

.so-nav {
  display: flex;
  align-items: center;
  gap: 0.15rem;
}

.so-nav a {
  font-size: 0.78rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--so-text-muted);
  padding: 0.4rem 0.65rem;
  border-radius: var(--so-radius);
  transition: color var(--so-transition), background var(--so-transition);
}

.so-nav a:hover {
  color: var(--so-text);
  background: var(--so-bg-alt);
}

.so-nav a.is-active {
  color: var(--so-text);
  font-weight: 500;
}

/* ── Typography ── */

.so-hero {
  padding: var(--so-space-xl) 0 var(--so-space-lg);
}

.so-hero__logo {
  margin-bottom: var(--so-space-md);
}

.so-hero__logo img {
  width: min(100%, 22rem);
  height: auto;
}

.so-hero__eyebrow {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--so-text-light);
  margin: 0 0 var(--so-space-sm);
}

.so-hero__title {
  font-family: var(--so-serif);
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--so-text);
  margin: 0 0 0.5rem;
}

.so-hero__tagline {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--so-accent);
  margin: 0 0 var(--so-space-md);
}

.so-hero__lead {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--so-text);
  max-width: 38em;
  margin: 0 0 var(--so-space-md);
}

.so-page-header {
  padding: var(--so-space-lg) 0 var(--so-space-md);
  border-bottom: 1px solid var(--so-border-light);
  margin-bottom: var(--so-space-lg);
}

.so-page-header h1 {
  font-family: var(--so-serif);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 500;
  line-height: 1.2;
  margin: 0 0 0.75rem;
}

.so-page-header p {
  font-size: 1.05rem;
  color: var(--so-text-muted);
  max-width: 36em;
  margin: 0;
}

h2.so-section-title {
  font-family: var(--so-serif);
  font-size: clamp(1.4rem, 3vw, 1.85rem);
  font-weight: 500;
  line-height: 1.25;
  margin: 0 0 var(--so-space-sm);
}

h3.so-subtitle {
  font-family: var(--so-serif);
  font-size: 1.15rem;
  font-weight: 500;
  margin: 0 0 0.5rem;
}

.so-section {
  padding: var(--so-space-lg) 0;
}

.so-section--alt {
  background: var(--so-bg-alt);
}

.so-section__inner {
  width: min(100% - 2.5rem, var(--so-max));
  margin-inline: auto;
}

.so-prose p {
  margin: 0 0 1.1rem;
  color: var(--so-text-muted);
}

.so-prose p:last-child { margin-bottom: 0; }

.so-prose strong { color: var(--so-text); font-weight: 500; }

.so-pullquote {
  font-family: var(--so-serif);
  font-size: clamp(1.3rem, 3vw, 1.65rem);
  font-weight: 400;
  line-height: 1.45;
  color: var(--so-text);
  margin: 0;
  padding-left: 1.5rem;
  border-left: 2px solid var(--so-accent);
}

/* ── Buttons ── */

.so-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--so-sans);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.85rem 1.6rem;
  border: 1px solid var(--so-accent);
  background: var(--so-accent);
  color: var(--so-bg);
  cursor: pointer;
  border-radius: var(--so-radius);
  transition: background var(--so-transition), color var(--so-transition), border-color var(--so-transition);
  text-decoration: none;
}

.so-btn:hover {
  background: var(--so-accent-soft);
  border-color: var(--so-accent-soft);
  color: var(--so-bg);
}

.so-btn--outline {
  background: transparent;
  color: var(--so-accent);
}

.so-btn--outline:hover {
  background: var(--so-accent);
  color: var(--so-bg);
}

.so-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ── Problem list (Incendios) ── */

.so-problems {
  list-style: none;
  padding: 0;
  margin: var(--so-space-md) 0 0;
  display: grid;
  gap: 0;
}

.so-problems li {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--so-border-light);
  font-size: 0.95rem;
  color: var(--so-text-muted);
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.so-problems li::before {
  content: '—';
  color: var(--so-text-light);
  flex-shrink: 0;
}

.so-problems li:first-child { border-top: 1px solid var(--so-border-light); }

/* ── Methodology diagram ── */

.so-method {
  margin: var(--so-space-md) 0;
}

.so-method__flow {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

.so-method__step {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 1.25rem;
  padding: 1.5rem 0;
  position: relative;
}

.so-method__step:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 1.45rem;
  top: 3.2rem;
  bottom: 0;
  width: 1px;
  background: var(--so-border);
}

.so-method__num {
  width: 2.9rem;
  height: 2.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--so-accent);
  font-family: var(--so-sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--so-accent);
  background: var(--so-bg);
  position: relative;
  z-index: 1;
}

.so-method__content h3 {
  font-family: var(--so-serif);
  font-size: 1.1rem;
  font-weight: 500;
  margin: 0 0 0.35rem;
}

.so-method__content p {
  font-size: 0.92rem;
  color: var(--so-text-muted);
  margin: 0;
  line-height: 1.6;
}

.so-method__badge {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--so-text-light);
  border: 1px solid var(--so-border);
  padding: 0.3rem 0.6rem;
  margin-bottom: var(--so-space-md);
}

/* ── Cases ── */

.so-cases {
  display: grid;
  gap: var(--so-space-md);
}

.so-case {
  padding: var(--so-space-md);
  background: var(--so-surface);
  border: 1px solid var(--so-border-light);
}

.so-case__type {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--so-text-light);
  margin-bottom: 0.6rem;
}

.so-case h3 {
  font-family: var(--so-serif);
  font-size: 1.2rem;
  font-weight: 500;
  margin: 0 0 0.75rem;
}

.so-case p {
  font-size: 0.92rem;
  color: var(--so-text-muted);
  margin: 0 0 0.6rem;
  line-height: 1.65;
}

.so-case p:last-child { margin-bottom: 0; }

.so-case__meta {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--so-border-light);
  font-size: 0.78rem;
  color: var(--so-text-light);
}

/* ── Areas grid ── */

.so-areas {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1px;
  background: var(--so-border);
  border: 1px solid var(--so-border);
  margin-top: var(--so-space-md);
}

.so-area {
  background: var(--so-bg);
  padding: 1.5rem 1.25rem;
}

.so-area h3 {
  font-family: var(--so-serif);
  font-size: 1rem;
  font-weight: 500;
  margin: 0 0 0.4rem;
}

.so-area p {
  font-size: 0.82rem;
  color: var(--so-text-muted);
  margin: 0;
  line-height: 1.55;
}

/* ── Artículos ── */

.so-articles-index {
  margin-bottom: var(--so-space-lg);
  padding-bottom: var(--so-space-md);
  border-bottom: 1px solid var(--so-border-light);
}

.so-articles-index h2 {
  font-family: var(--so-serif);
  font-size: 1rem;
  font-weight: 500;
  margin: 0 0 var(--so-space-sm);
  color: var(--so-text-muted);
}

.so-articles-index ol {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.75rem;
}

.so-articles-index a {
  font-family: var(--so-serif);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--so-accent);
  line-height: 1.4;
}

.so-articles-index a:hover {
  color: var(--so-accent-soft);
}

.so-article {
  padding: var(--so-space-lg) 0;
  border-bottom: 1px solid var(--so-border-light);
}

.so-article:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.so-article__title {
  font-family: var(--so-serif);
  font-size: clamp(1.55rem, 3.5vw, 2rem);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 1.25rem;
  color: var(--so-text);
}

.so-article__body p {
  margin: 0 0 1.1rem;
  color: var(--so-text-muted);
  line-height: 1.75;
}

.so-article__body p:last-of-type {
  margin-bottom: 0;
}

.so-article__body ul {
  margin: 0 0 1.25rem;
  padding: 0 0 0 1.25rem;
  color: var(--so-text-muted);
}

.so-article__body li {
  margin-bottom: 0.45rem;
  line-height: 1.65;
}

.so-article__body li::marker {
  color: var(--so-text-light);
}

.so-article__signature {
  margin-top: 1.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--so-border-light);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--so-accent);
}

.so-articles-empty {
  padding: var(--so-space-lg) 0;
  text-align: center;
}

.so-articles-empty p {
  color: var(--so-text-light);
  font-size: 0.92rem;
  max-width: 28em;
  margin: 0 auto;
}

.so-articles-topics {
  margin-top: var(--so-space-md);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}

.so-articles-topics span {
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--so-text-light);
  border: 1px solid var(--so-border);
  padding: 0.35rem 0.7rem;
}

/* ── Forms ── */

.so-form {
  max-width: 28rem;
}

.so-form label {
  display: block;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--so-text-muted);
  margin-bottom: 0.35rem;
}

.so-form input,
.so-form textarea,
.so-form select {
  width: 100%;
  font-family: var(--so-sans);
  font-size: 0.95rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--so-border);
  background: var(--so-surface);
  color: var(--so-text);
  border-radius: var(--so-radius);
  margin-bottom: 1.1rem;
  transition: border-color var(--so-transition);
}

.so-form input:focus,
.so-form textarea:focus,
.so-form select:focus {
  outline: none;
  border-color: var(--so-accent);
}

.so-form textarea {
  min-height: 8rem;
  resize: vertical;
}

.so-form .so-field-hint {
  font-size: 0.82rem;
  color: var(--so-text-light);
  margin: -0.6rem 0 1.1rem;
}

.so-alert {
  padding: 0.85rem 1rem;
  font-size: 0.88rem;
  margin-bottom: 1.25rem;
  border-radius: var(--so-radius);
}

.so-alert--success {
  background: #eef3ef;
  color: var(--so-accent);
  border: 1px solid #c8d5cb;
}

.so-alert--error {
  background: #faf0ef;
  color: #6b3a35;
  border: 1px solid #e0c4c0;
}

.so-alert.hidden { display: none; }

.so-hp { position: absolute; left: -9999px; opacity: 0; height: 0; overflow: hidden; }

/* ── Diagnóstico checklist ── */

.so-checklist {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--so-space-md);
}

.so-checklist li {
  margin-bottom: 0.5rem;
}

.so-checklist label {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  font-size: 0.92rem;
  color: var(--so-text-muted);
  cursor: pointer;
  text-transform: none;
  letter-spacing: 0;
  font-weight: 400;
}

.so-checklist input[type="checkbox"] {
  width: auto;
  margin: 0.25rem 0 0;
  accent-color: var(--so-accent);
}

/* ── Footer ── */

.so-footer {
  border-top: 1px solid var(--so-border-light);
  padding: var(--so-space-md) 0;
  margin-top: var(--so-space-lg);
}

.so-footer__inner {
  width: min(100% - 2.5rem, var(--so-wide));
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--so-space-sm);
}

.so-footer__brand {
  display: flex;
  align-items: center;
}

.so-footer__logo {
  display: block;
  height: 1.65rem;
  width: auto;
  max-width: 9rem;
  object-fit: contain;
  opacity: 0.85;
}

.so-footer__meta {
  font-size: 0.72rem;
  color: var(--so-text-light);
  letter-spacing: 0.04em;
}

.so-footer__meta a {
  color: var(--so-text-light);
}

.so-footer__meta a:hover { color: var(--so-text-muted); }

/* ── CTA band ── */

.so-cta-band {
  background: var(--so-accent);
  color: var(--so-bg);
  padding: var(--so-space-lg) 0;
  margin-top: var(--so-space-lg);
}

.so-cta-band__inner {
  width: min(100% - 2.5rem, var(--so-max));
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--so-space-md);
}

.so-cta-band h2 {
  font-family: var(--so-serif);
  font-size: clamp(1.2rem, 2.5vw, 1.5rem);
  font-weight: 400;
  margin: 0;
  max-width: 20em;
  line-height: 1.4;
}

.so-cta-band .so-btn {
  background: var(--so-bg);
  color: var(--so-accent);
  border-color: var(--so-bg);
  flex-shrink: 0;
}

.so-cta-band .so-btn:hover {
  background: var(--so-surface);
  border-color: var(--so-surface);
}

/* ── Responsive ── */

@media (max-width: 860px) {
  .so-nav-toggle { display: block; }

  .so-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--so-bg);
    border-bottom: 1px solid var(--so-border);
    padding: 0.5rem 1.25rem 1rem;
  }

  .so-nav.is-open { display: flex; }

  .so-nav a {
    padding: 0.65rem 0;
    border-bottom: 1px solid var(--so-border-light);
  }

  .so-brand__mark { display: none; }

  .so-brand__logo {
    max-width: min(48vw, 10rem);
  }

  .so-header { position: relative; }

  .so-hero { padding-top: var(--so-space-lg); }

  .so-cta-band__inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  html { font-size: 16px; }

  .so-areas {
    grid-template-columns: 1fr;
  }
}