/* ================================================================
   styles.css — Movilidad UCI · Documentación del Proyecto
   Diseño limpio tipo documentación de producto.
   Sin dependencias externas. Sistema de tipografía nativo.
================================================================ */

/* ----------------------------------------------------------------
   VARIABLES CSS
---------------------------------------------------------------- */
:root {
  /* Colores primarios */
  --color-primary:        #ea580c;
  --color-primary-light:  #f97316;
  --color-primary-dark:   #c2410c;

  /* Texto */
  --color-text:           #111827;
  --color-text-muted:     #6b7280;
  --color-text-light:     #9ca3af;

  /* Fondos */
  --color-bg:             #ffffff;
  --color-bg-alt:         #f8fafc;
  --color-bg-dark:        #18181b;

  /* Bordes y separadores */
  --color-border:         #e2e8f0;
  --color-border-strong:  #cbd5e1;

  /* Arquitectura: colores por capa */
  --layer-ui:             #f9fafb;
  --layer-ui-border:      #d1d5db;
  --layer-api:            #fff7ed;
  --layer-api-border:     #fed7aa;
  --layer-domain:         #f3f4f6;
  --layer-domain-border:  #9ca3af;
  --layer-persist:        #fafafa;
  --layer-persist-border: #d4d4d4;
  --layer-utils:          #fff7ed;
  --layer-utils-border:   #fdba74;

  /* Solución: colores por nodo */
  --sol-input:            #f3f4f6;
  --sol-input-border:     #9ca3af;
  --sol-core:             #ea580c;
  --sol-output:           #fff7ed;
  --sol-output-border:    #fb923c;

  /* Tipografía */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
               Oxygen, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Cascadia Code', 'Liberation Mono',
               Menlo, Courier, monospace;

  /* Espaciado */
  --space-xs:   0.25rem;
  --space-sm:   0.5rem;
  --space-md:   1rem;
  --space-lg:   1.5rem;
  --space-xl:   2rem;
  --space-2xl:  3rem;
  --space-3xl:  4rem;

  /* Contenedor */
  --container-max: 1000px;
  --container-px:  1.5rem;

  /* Bordes redondeados */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;

  /* Sombras */
  --shadow-sm:  0 1px 3px 0 rgba(0,0,0,.07), 0 1px 2px 0 rgba(0,0,0,.04);
  --shadow-md:  0 4px 6px -1px rgba(0,0,0,.08), 0 2px 4px -1px rgba(0,0,0,.04);
  --shadow-lg:  0 10px 15px -3px rgba(0,0,0,.08), 0 4px 6px -2px rgba(0,0,0,.04);

  /* Transiciones */
  --transition: 150ms ease;
}


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

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

img,
picture,
svg {
  display: block;
  max-width: 100%;
}

ul,
ol {
  list-style: none;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

p + p {
  margin-top: var(--space-md);
}

h1, h2, h3, h4 {
  line-height: 1.25;
  font-weight: 700;
  color: var(--color-text);
}


/* ----------------------------------------------------------------
   UTILIDADES
---------------------------------------------------------------- */

/* Contenedor centrado de ancho máximo */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-px);
}

/* Texto auxiliar en mayúsculas tipo label */
.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

/* Encabezado de sección */
.section-header {
  margin-bottom: var(--space-xl);
}

.section-title {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--color-text);
}

/* Párrafo introductorio */
.section-intro {
  max-width: 680px;
  color: var(--color-text-muted);
  font-size: 1.05rem;
  margin-bottom: var(--space-2xl);
}


/* ----------------------------------------------------------------
   BOTONES
---------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background-color var(--transition), color var(--transition),
              border-color var(--transition), box-shadow var(--transition);
  text-decoration: none;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  text-decoration: none;
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: #fff;
  text-decoration: none;
}


/* ----------------------------------------------------------------
   NAVEGACIÓN
---------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 58px;
  gap: var(--space-xl);
}

.nav-logo {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

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

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
  text-decoration: none;
}

.nav-links a.active {
  font-weight: 600;
}


/* ----------------------------------------------------------------
   SECCIONES BASE
---------------------------------------------------------------- */
.section {
  padding-block: var(--space-3xl);
  background-color: var(--color-bg);
}

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


/* ----------------------------------------------------------------
   HERO
---------------------------------------------------------------- */
.hero {
  background-color: var(--color-bg-dark);
  padding-block: 5rem 4rem;
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-lg);
}

.hero-label {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary-light);
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: #94a3b8;
  max-width: 640px;
  line-height: 1.7;
  margin-top: 0;
}

.hero-subtitle strong {
  color: #e2e8f0;
}

/* Badges de tecnologías */
.tech-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  background-color: rgba(234,88,12,0.15);
  color: #fb923c;
  border: 1px solid rgba(234,88,12,0.3);
  white-space: nowrap;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-top: var(--space-sm);
}

.hero-tagline {
  font-size: 0.83rem;
  color: #475569;
  font-weight: 500;
  letter-spacing: 0.01em;
  margin-top: 0;
}


/* ----------------------------------------------------------------
   STACK TECNOLÓGICO
---------------------------------------------------------------- */
.stack-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.stack-item {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

.stack-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.stack-category {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary-light);
  margin-bottom: var(--space-xs);
}

.stack-tech {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.stack-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  margin: 0;
}

@media (max-width: 700px) {
  .stack-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .stack-grid {
    grid-template-columns: 1fr;
  }
}

/* ----------------------------------------------------------------
   EL PROBLEMA
---------------------------------------------------------------- */
.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: start;
}

.problem-text {
  color: var(--color-text-muted);
  font-size: 0.98rem;
}

.pain-points {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.pain-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.pain-card strong {
  display: block;
  font-size: 0.92rem;
  color: var(--color-text);
  margin-bottom: 0.15rem;
}

.pain-card p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 0;
}

.pain-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
  margin-top: 0.1rem;
  color: #f59e0b;
}


/* ----------------------------------------------------------------
   LA SOLUCIÓN — DIAGRAMA
---------------------------------------------------------------- */
.solution-diagram {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 0;
  flex-wrap: nowrap;
  margin-top: var(--space-xl);
}

.sol-node {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  border-radius: var(--radius-lg);
  border: 2px solid transparent;
  gap: var(--space-sm);
}

.sol-node--input {
  background-color: var(--sol-input);
  border-color: var(--sol-input-border);
}

.sol-node--core {
  background-color: var(--sol-core);
  color: #fff;
}

.sol-node--output {
  background-color: var(--sol-output);
  border-color: var(--sol-output-border);
}

.sol-node-icon {
  font-size: 2rem;
}

.sol-node-label {
  font-size: 1rem;
  font-weight: 700;
}

.sol-node--core .sol-node-label {
  color: #fff;
}

.sol-node-desc {
  font-size: 0.83rem;
  color: var(--color-text-muted);
}

.sol-node--core .sol-node-desc {
  color: #bfdbfe;
}

.sol-arrow {
  display: flex;
  align-items: center;
  font-size: 1.5rem;
  color: var(--color-border-strong);
  padding-inline: var(--space-md);
  flex-shrink: 0;
}


/* ----------------------------------------------------------------
   ARQUITECTURA — DIAGRAMA VERTICAL
---------------------------------------------------------------- */
.arch-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  max-width: 720px;
  margin-inline: auto;
}

.arch-layer {
  width: 100%;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  padding: var(--space-lg) var(--space-xl);
  box-shadow: var(--shadow-sm);
}

.arch-layer--ui          { background-color: var(--layer-ui);      border-color: var(--layer-ui-border); }
.arch-layer--api         { background-color: var(--layer-api);     border-color: var(--layer-api-border); }
.arch-layer--domain      { background-color: var(--layer-domain);  border-color: var(--layer-domain-border); }
.arch-layer--persistence { background-color: var(--layer-persist); border-color: var(--layer-persist-border); }
.arch-layer--utils       { background-color: var(--layer-utils);   border-color: var(--layer-utils-border); }

.arch-layer-title {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.arch-layer-items {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.arch-item {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  background-color: rgba(255,255,255,0.65);
  border: 1px solid rgba(0,0,0,0.08);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-text);
}

.arch-connector {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  padding-block: var(--space-sm);
}

.arch-connector-line {
  display: block;
  width: 2px;
  height: 24px;
  background-color: var(--color-border-strong);
}

.arch-connector-label {
  font-size: 0.72rem;
  color: var(--color-text-light);
  font-style: italic;
}


/* ----------------------------------------------------------------
   FUNCIONALIDADES — TARJETAS
---------------------------------------------------------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.feature-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

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

.feature-icon {
  font-size: 1.75rem;
  margin-bottom: var(--space-md);
  line-height: 1;
}

.feature-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.feature-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-md);
  margin-top: var(--space-md);
}

.feature-list li {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  padding-left: 1.1em;
  position: relative;
}

.feature-list li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}


/* ----------------------------------------------------------------
   DEMOSTRACIÓN — CAPTURAS
---------------------------------------------------------------- */
.screenshots-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.screenshot-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.screenshot-placeholder {
  background-color: #e5e7eb;
  height: 220px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-size: 0.9rem;
  font-weight: 600;
  color: #9ca3af;
  border-bottom: 1px solid var(--color-border);
  text-align: center;
  padding: var(--space-md);
}

.screenshot-hint {
  display: block;
  font-size: 0.78rem;
  font-weight: 400;
  color: #b0b7bf;
}

.screenshot-img {
  display: block;
  width: 100%;
  height: 220px;
  object-fit: cover;
  object-position: top;
  border-bottom: 1px solid var(--color-border);
}

/* ----------------------------------------------------------------
   LIGHTBOX
---------------------------------------------------------------- */
#gif-lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s ease;
}

#gif-lightbox.active {
  display: flex;
  opacity: 1;
}

#gif-lightbox-inner {
  position: relative;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 24px 64px rgba(0,0,0,0.4);
  padding: 1rem;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  animation: lb-pop 0.25s cubic-bezier(0.34,1.56,0.64,1) both;
}

@keyframes lb-pop {
  from { transform: scale(0.85); opacity: 0; }
  to   { transform: scale(1);    opacity: 1; }
}

#gif-lightbox-img {
  max-width: 80vw;
  max-height: 75vh;
  border-radius: 6px;
  display: block;
  object-fit: contain;
}

#gif-lightbox-caption {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-muted, #6b7280);
  margin: 0;
}

#gif-lightbox-close {
  position: absolute;
  top: 0.5rem;
  right: 0.6rem;
  background: none;
  border: none;
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
  color: #9ca3af;
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  transition: color 0.15s, background 0.15s;
}

#gif-lightbox-close:hover {
  color: #111;
  background: #f3f4f6;
}

.screenshot-caption {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text-muted);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-bg);
  text-align: center;
}


/* ----------------------------------------------------------------
   DECISIONES TÉCNICAS
---------------------------------------------------------------- */
.decisions-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.decision-card {
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.decision-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-border);
}

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


/* ----------------------------------------------------------------
   RETOS Y APRENDIZAJES
---------------------------------------------------------------- */
.challenges-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.challenge-item {
  display: flex;
  gap: var(--space-xl);
  align-items: flex-start;
}

.challenge-number {
  font-size: 2rem;
  font-weight: 800;
  color: #d4d4d4;
  line-height: 1;
  flex-shrink: 0;
  min-width: 3rem;
  font-variant-numeric: tabular-nums;
}

.challenge-content h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.challenge-content p {
  font-size: 0.92rem;
  color: var(--color-text-muted);
}


/* ----------------------------------------------------------------
   INSTALACIÓN
---------------------------------------------------------------- */
.install-tabs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.install-option {
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.install-option-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.install-badge {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.install-badge--recommended {
  background-color: #ea580c;
  color: #ffffff;
  border: 1px solid #c2410c;
}

.install-option > p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.install-steps {
  list-style: decimal;
  padding-left: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.install-steps li {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* Bloque de código */

.code-block {
  background-color: #1c1c1c;
  color: #e5e5e5;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  /* overflow handled by inner scroller so the button remains fixed */
  overflow: visible;
  margin-top: var(--space-sm);
  line-height: 1.6;
  border: none;
  position: relative;
}

/* Contenedor scrollable que guarda el <pre> */
.code-scroll {
  overflow-x: auto;
  white-space: nowrap;
  -webkit-overflow-scrolling: touch;
}

/* Scrollbar reducido y sutil para los bloques de código */
.code-scroll {
  scrollbar-width: thin; /* Firefox */
  scrollbar-color: rgba(255,255,255,0.18) transparent; /* thumb track */
}

.code-scroll::-webkit-scrollbar {
  height: 8px;
}
.code-scroll::-webkit-scrollbar-track {
  background: transparent;
}
.code-scroll::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.14);
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
.code-scroll::-webkit-scrollbar-thumb:hover {
  background: rgba(255,255,255,0.22);
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background-color: #fff0e6;
  padding: 0.1em 0.35em;
  border-radius: var(--radius-sm);
  color: #9a3412;
  border: none;
}

.code-block code {
  background: none;
  color: inherit;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
  border: none;
}

/* Botón copiar dentro del bloque de código */
.code-copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(255,255,255,0.14);
  color: #0b1220;
  border: 1px solid rgba(255,255,255,0.18);
  padding: 0.25rem 0.5rem;
  font-size: 0.78rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 120ms ease, transform 120ms ease;
  z-index: 5;
}

.code-copy-btn:hover {
  background: rgba(255,255,255,0.12);
  transform: translateY(-1px);
}

.code-copy-btn.copied {
  background: #10b981;
  border-color: #059669;
  color: #fff;
}

.code-block pre { margin: 0; white-space: pre; font-family: var(--font-mono); }

/* SVG sizing inside copy button */
.code-copy-btn svg { width: 1rem; height: 1rem; display: block; }

/* Visually hidden helper for screen readers */
.visually-hidden {
  position: absolute !important;
  height: 1px; width: 1px;
  overflow: hidden; clip: rect(1px, 1px, 1px, 1px);
  white-space: nowrap; border: 0; padding: 0; margin: -1px;
}

/* Tabla de requisitos */
.system-requirements {
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.requirements-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
  color: var(--color-text);
}

.requirements-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.requirements-table th,
.requirements-table td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.requirements-table th {
  font-weight: 700;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background-color: var(--color-bg);
}

.requirements-table td {
  color: var(--color-text-muted);
}

.requirements-table td:first-child {
  font-weight: 600;
  color: var(--color-text);
}

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


/* ----------------------------------------------------------------
   SMARTSCREEN
---------------------------------------------------------------- */
.smartscreen-callout {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
  background-color: #fffbeb;
  border: 1px solid #f59e0b;
  border-left: 4px solid #f59e0b;
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.smartscreen-callout-icon {
  font-size: 1.25rem;
  color: #b45309;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.smartscreen-callout strong {
  display: block;
  color: #92400e;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.smartscreen-callout p {
  font-size: 0.9rem;
  color: #78350f;
  margin: 0;
  line-height: 1.6;
}

.smartscreen-reasons {
  list-style: none;
  padding: 0;
  margin: var(--space-sm) 0 var(--space-md) 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.smartscreen-reasons li {
  font-size: 0.875rem;
  color: #78350f;
  line-height: 1.6;
  padding-left: 1.1rem;
  position: relative;
}

.smartscreen-reasons li::before {
  content: "–";
  position: absolute;
  left: 0;
  color: #b45309;
}

.smartscreen-steps {
  list-style: decimal;
  padding-left: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.smartscreen-steps li {
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.6;
}

.smartscreen-steps li strong {
  color: var(--color-primary-dark);
}

.smartscreen-steps-note {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: var(--space-md);
  font-style: italic;
  line-height: 1.6;
}

.smartscreen-dialog {
  background-color: #f8fafc;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  margin-top: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-width: 460px;
  box-shadow: var(--shadow-sm);
}

.smartscreen-dialog-row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
}

.smartscreen-dialog-icon {
  font-size: 1.1rem;
  color: #d97706;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.smartscreen-dialog p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.5;
}

.smartscreen-dialog-check {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.875rem;
  color: var(--color-text);
  font-weight: 500;
  padding-left: 0.2rem;
}

.smartscreen-dialog-checkbox {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1rem;
  height: 1rem;
  border: 2px solid var(--color-primary);
  border-radius: 3px;
  background-color: var(--color-primary);
  color: #fff;
  font-size: 0.65rem;
  flex-shrink: 0;
}

.smartscreen-subheading {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}

.smartscreen-body {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

.smartscreen-pipeline {
  list-style: decimal;
  padding-left: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
  margin-bottom: var(--space-md);
}

.smartscreen-pipeline li {
  font-size: 0.875rem;
  color: #78350f;
  line-height: 1.6;
}

.smartscreen-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.smartscreen-option {
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.smartscreen-option--primary {
  border-color: var(--color-primary-light);
  background-color: #fff7ed;
}

.smartscreen-option-label {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.smartscreen-option > p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

.smartscreen-note {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  line-height: 1.6;
}

.smartscreen-note strong {
  color: var(--color-text);
}


/* ----------------------------------------------------------------
   FOOTER
---------------------------------------------------------------- */
.site-footer {
  background-color: var(--color-bg-dark);
  padding-block: var(--space-2xl);
  border-top: 1px solid #2d2d30;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.footer-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer-project {
  font-size: 1rem;
  font-weight: 700;
  color: #f1f5f9;
}

.footer-author {
  font-size: 0.85rem;
  color: #94a3b8;
}

.footer-year {
  font-size: 0.8rem;
  color: #64748b;
}

.footer-license {
  font-size: 0.8rem;
  color: #64748b;
}

.footer-license a {
  color: #94a3b8;
  text-decoration: none;
}

.footer-license a:hover {
  color: #cbd5e1;
  text-decoration: underline;
}

.install-sha-note {
  font-size: 0.875rem;
  color: #94a3b8;
  margin-top: 0.75rem;
  margin-bottom: 0;
}

.footer-links {
  display: flex;
  gap: var(--space-md);
}

.footer-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary-light);
  transition: color var(--transition);
}

.footer-link:hover {
  color: #fff;
  text-decoration: none;
}


/* ----------------------------------------------------------------
   AUTORA DEL PROYECTO
---------------------------------------------------------------- */
.authorship-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-2xl);
  flex-wrap: wrap;
  box-shadow: var(--shadow-sm);
}

.authorship-degree {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 var(--space-xs) 0;
}

.authorship-meta {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin: 0;
}

.authorship-meta + .authorship-meta {
  margin-top: 0.2rem;
}

.authorship-links {
  flex-shrink: 0;
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}


/* ----------------------------------------------------------------
   BOTÓN VOLVER ARRIBA
---------------------------------------------------------------- */
#back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 200;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #fff;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, background-color var(--transition), transform var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

#back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

#back-to-top:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-3px);
}


/* ================================================================
   RESPONSIVE — MEDIA QUERIES
================================================================ */

/* Pantallas medianas (≤ 768px) */
@media (max-width: 768px) {

  /* Navegación: ocultar links en pantallas pequeñas */
  .nav-links {
    display: none;
  }

  /* Hero más compacto */
  .hero {
    padding-block: 3rem 2.5rem;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  /* Secciones con menos padding */
  .section {
    padding-block: var(--space-2xl);
  }

  /* Problema: una columna */
  .problem-grid {
    grid-template-columns: 1fr;
  }

  /* Solución: columna vertical */
  .solution-diagram {
    flex-direction: column;
    align-items: center;
    max-width: 380px;
    margin-inline: auto;
    gap: var(--space-sm);
  }

  .sol-arrow {
    transform: rotate(90deg);
    padding-inline: 0;
    padding-block: var(--space-xs);
    font-size: 1.2rem;
  }

  /* Arquitectura ya es columna, solo ajustar padding */
  .arch-layer {
    padding: var(--space-md) var(--space-lg);
  }

  /* Funcionalidades: una columna */
  .features-grid {
    grid-template-columns: 1fr;
  }

  /* Capturas: una columna */
  .screenshots-grid {
    grid-template-columns: 1fr;
  }

  /* Decisiones: una columna */
  .decisions-grid {
    grid-template-columns: 1fr;
  }

  /* Instalación: una columna */
  .install-tabs {
    grid-template-columns: 1fr;
  }

  /* SmartScreen opciones: una columna */
  .smartscreen-options {
    grid-template-columns: 1fr;
  }

  /* Autoría en columna */
  .authorship-card {
    flex-direction: column;
    padding: var(--space-lg);
  }

  /* Footer en columna */
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  /* Retos: reducir número decorativo */
  .challenge-number {
    font-size: 1.5rem;
    min-width: 2.5rem;
  }
}

/* Pantallas pequeñas (≤ 480px) */
@media (max-width: 480px) {

  :root {
    --container-px: 1rem;
  }

  .hero-title {
    font-size: 1.875rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .btn {
    justify-content: center;
    width: 100%;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .challenge-item {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .challenge-number {
    font-size: 1.25rem;
  }

  .sol-node {
    padding: var(--space-lg) var(--space-md);
  }

  #back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 2.25rem;
    height: 2.25rem;
    font-size: 1.1rem;
  }
}