/* ============================================================
   Kiro Booth Landing Page — styles.css
   Paleta oscura con acentos. Compatible con file:// y S3.
   ============================================================ */

/* ---------- Variables / Design Tokens ---------- */
:root {
  /* Colores principales */
  --color-bg:           #0d1117;
  --color-surface:      #161b22;
  --color-surface-alt:  #1c2333;
  --color-border:       #30363d;

  /* Acentos */
  --color-accent:       #58a6ff;
  --color-accent-hover: #79c0ff;
  --color-accent-muted: #1f3a5f;

  /* Texto */
  --color-text-primary:   #e6edf3;
  --color-text-secondary: #8b949e;
  --color-text-muted:     #6e7681;

  /* Semáforo */
  --color-success: #3fb950;
  --color-warning: #d29922;

  /* Tipografía */
  --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 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;

  /* Layout */
  --max-width: 1200px;
  --navbar-height: 64px;

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

  /* Sombras */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);

  /* Transiciones */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* ---------- Reset mínimo ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover,
a:focus-visible {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

ul,
ol {
  list-style: none;
}

/* ---------- Utilidades de layout ---------- */
.section__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section {
  padding: var(--space-3xl) 0;
}

.section__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
  line-height: 1.2;
}

.section__subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 680px;
  margin-bottom: var(--space-2xl);
}

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--navbar-height);
  background-color: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.navbar__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
}

.navbar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
  flex-shrink: 0;
}

.navbar__brand:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.navbar__logo {
  height: 60px;
  width: auto;
}

.navbar__logo-fallback {
  display: none;
  font-size: 1.25rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-accent), #a371f7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar__menu {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.navbar__link {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  text-decoration: none;
}

.navbar__link:hover,
.navbar__link:focus-visible {
  color: var(--color-text-primary);
  background-color: var(--color-surface);
  text-decoration: none;
}

.navbar__link.is-active {
  color: var(--color-accent);
  background-color: var(--color-accent-muted);
}

/* Hamburger — hidden on desktop */
.navbar__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  padding: var(--space-sm);
}

.navbar__hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.navbar__hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.navbar__hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.navbar__hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  min-height: calc(100vh - var(--navbar-height));
  display: flex;
  align-items: center;
  background: radial-gradient(ellipse at 60% 0%, rgba(88, 166, 255, 0.08) 0%, transparent 70%),
              radial-gradient(ellipse at 10% 80%, rgba(163, 113, 247, 0.06) 0%, transparent 60%),
              var(--color-bg);
}

.hero__inner {
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-3xl);
}

.hero__event-label {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
}

.hero__event-name {
  font-size: clamp(2.25rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  background: linear-gradient(135deg, #e6edf3, var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__tagline {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-bottom: var(--space-2xl);
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

/* ============================================================
   BOTONES
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: var(--font-sans);
  padding: 0.625rem var(--space-xl);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--transition-fast),
              border-color var(--transition-fast),
              color var(--transition-fast),
              box-shadow var(--transition-fast);
  white-space: nowrap;
}

.btn--primary {
  background-color: var(--color-accent);
  color: #0d1117;
  border-color: var(--color-accent);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #0d1117;
  text-decoration: none;
  box-shadow: 0 0 0 4px rgba(88, 166, 255, 0.2);
}

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

.btn--secondary:hover,
.btn--secondary:focus-visible {
  background-color: var(--color-surface);
  border-color: var(--color-text-secondary);
  color: var(--color-text-primary);
  text-decoration: none;
}

.btn--download {
  background-color: var(--color-surface-alt);
  color: var(--color-accent);
  border-color: var(--color-border);
  font-size: 0.875rem;
  padding: 0.5rem var(--space-lg);
  margin-top: var(--space-sm);
}

.btn--download:hover,
.btn--download:focus-visible {
  background-color: var(--color-accent-muted);
  border-color: var(--color-accent);
  color: var(--color-accent-hover);
  text-decoration: none;
}

.btn--download-alt {
  background-color: transparent;
  margin-left: var(--space-sm);
}

/* ============================================================
   QUÉ ES KIRO
   ============================================================ */
.what-is-kiro {
  background-color: var(--color-surface);
}

.what-is-kiro__brand {
  margin-bottom: var(--space-xl);
}

.what-is-kiro__logo {
  height: 48px;
  width: auto;
}

.what-is-kiro__logo-fallback {
  display: none;
  font-size: 2.5rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--color-accent), #a371f7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.features-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.feature-card {
  background-color: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  display: flex;
  gap: var(--space-lg);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.feature-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.feature-card__icon {
  font-size: 2rem;
  flex-shrink: 0;
  line-height: 1;
}

.feature-card__title {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.feature-card__desc {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ============================================================
   DESCARGA
   ============================================================ */
.download {
  background-color: var(--color-bg);
}

.download__layout {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.download__subtitle {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
}

/* Pasos */
.steps-list {
  list-style: decimal;
  list-style-position: inside;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.steps-list li {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
  padding-left: var(--space-sm);
}

.steps-list li::marker {
  color: var(--color-accent);
  font-weight: 600;
}

/* Cards de SO */
.os-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.os-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
}

.os-card__icon {
  font-size: 2rem;
  flex-shrink: 0;
  line-height: 1;
}

.os-card__name {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.os-card__req {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

/* Requisitos del sistema */
.download__requirements {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.requirements-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-sm) var(--space-xl);
  margin-top: var(--space-md);
}

.requirements-list li {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  padding-left: var(--space-lg);
  position: relative;
}

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

/* ============================================================
   RETO DEL EVENTO
   ============================================================ */
.challenge {
  background-color: var(--color-surface);
}

.challenge__card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
}

.challenge__title {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.challenge__description {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 720px;
}

.challenge__section-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
}

.challenge__steps {
  margin-bottom: var(--space-xl);
}

.challenge-steps-list {
  list-style: decimal;
  list-style-position: inside;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.challenge-steps-list li {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  padding-left: var(--space-sm);
}

.challenge-steps-list li::marker {
  color: var(--color-accent);
  font-weight: 600;
}

.challenge__criteria {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-xl);
}

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

.challenge-criteria-list li {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  padding-left: var(--space-xl);
  position: relative;
}

.challenge-criteria-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: 700;
}

/* ============================================================
   CANJE DE CÓDIGO (REDEMPTION)
   ============================================================ */
.redemption {
  background-color: var(--color-surface);
}

/* Instrucciones y recordatorio de fechas — tarjetas sobre la superficie */
.redemption__instructions,
.redemption__deadlines {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-lg);
  max-width: 720px;
}

.redemption__deadlines {
  border-left: 4px solid var(--color-warning);
}

.redemption__subtitle {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.redemption__steps {
  list-style: decimal;
  list-style-position: inside;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.redemption__steps li {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  padding-left: var(--space-sm);
}

.redemption__steps li::marker {
  color: var(--color-accent);
  font-weight: 600;
}

.redemption__deadlines p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.redemption__link {
  color: var(--color-accent);
  font-weight: 500;
}

.redemption__link:hover,
.redemption__link:focus-visible {
  color: var(--color-accent-hover);
}

/* Formulario de validación */
.redemption__form {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-lg);
  max-width: 720px;
}

.redemption__label {
  display: block;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

/* Campo: en línea en escritorio, apilado en móvil */
.redemption__field {
  display: flex;
  gap: var(--space-md);
  align-items: stretch;
}

.redemption__input {
  flex: 1;
  min-width: 0;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  color: var(--color-text-primary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.625rem var(--space-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.redemption__input:focus-visible {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
}

.redemption__form .btn {
  flex-shrink: 0;
}

/* Zona de resultado */
.redemption__result {
  max-width: 720px;
}

.redemption__result:empty {
  display: none;
}

/* Tarjeta de resultado exitoso (código asignado) */
.redemption__result .redemption__card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-success);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.redemption__result .redemption__code {
  font-family: var(--font-mono);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-accent);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  word-break: break-all;
}

.redemption__result .redemption__meta {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.redemption__result .redemption__meta strong {
  color: var(--color-text-primary);
}

/* Mensaje de error / no autorizado / sin códigos */
.redemption__error {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-warning);
  border-radius: var(--radius-lg);
  padding: var(--space-lg) var(--space-xl);
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* CTA de registro para nuevos usuarios */
.redemption__signup {
  margin-top: var(--space-xl);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-md);
}

.redemption__signup p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin: 0;
}

/* ============================================================
   COMUNIDAD
   ============================================================ */
.community {
  background-color: var(--color-bg);
}

.resources-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
}

.resource-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.resource-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.resource-card__icon {
  font-size: 1.5rem;
  line-height: 1;
}

.resource-card__name {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.resource-card__desc {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  flex: 1;
}

.resource-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-top: var(--space-sm);
}

.resource-card__link:hover {
  color: var(--color-accent-hover);
}

.resource-card--placeholder {
  opacity: 0.5;
  font-style: italic;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

.resource-group {
  list-style: none;
}

.resource-group__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-accent);
}

.resources-list--nested {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
  padding: 0;
  margin: 0 0 var(--space-xl) 0;
  list-style: none;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) 0;
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
}

.footer__text {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.footer__link {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.footer__link:hover {
  color: var(--color-text-secondary);
}

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

/* Tablet: ≥ 768px */
@media (min-width: 768px) and (max-width: 1279px) {
  .download__layout {
    grid-template-columns: 1fr;
  }
}

/* Mobile: < 768px */
@media (max-width: 767px) {
  :root {
    --navbar-height: 56px;
  }

  .navbar__hamburger {
    display: flex;
  }

  .navbar__menu {
    display: none;
    position: absolute;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-sm) var(--space-md);
    box-shadow: var(--shadow-md);
  }

  .navbar__menu.is-open {
    display: flex;
  }

  .navbar__link {
    padding: var(--space-md);
    border-radius: var(--radius-sm);
    display: block;
  }

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

  .section {
    padding: var(--space-2xl) 0;
  }

  .hero__cta {
    flex-direction: column;
    align-items: flex-start;
  }

  .download__layout {
    grid-template-columns: 1fr;
  }

  .features-list {
    grid-template-columns: 1fr;
  }

  .resources-list {
    grid-template-columns: 1fr;
  }

  .feature-card {
    flex-direction: column;
    gap: var(--space-md);
  }

  .os-card {
    flex-direction: column;
    gap: var(--space-md);
  }

  .btn--download-alt {
    margin-left: 0;
    margin-top: var(--space-sm);
    display: block;
  }

  .footer__inner {
    flex-direction: column;
    text-align: center;
  }

  .requirements-list {
    grid-template-columns: 1fr;
  }

  /* Canje: campo apilado y botón a ancho completo en móvil */
  .redemption__field {
    flex-direction: column;
    align-items: stretch;
  }

  .redemption__form .btn {
    width: 100%;
  }

  .redemption__signup {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Desktop: ≥ 1280px */
@media (min-width: 1280px) {
  .features-list {
    grid-template-columns: repeat(4, 1fr);
  }
}