/* ==========================================================================
   app.css — Base moderna (PromptingAcademy)
   - Tokens/variables
   - Layout + grids
   - Tipografía + utilidades
   - Secciones (hero, cta, etc.)
   - Páginas (home/level/session)
   ========================================================================== */

/* ----------------------------- */
/* 0) Reset & Base               */
/* ----------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, "Noto Sans", "Liberation Sans", sans-serif;
  line-height: 1.6;
  background: var(--bg);
  color: var(--text);
}

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

a {
  color: inherit;
  text-decoration: none;
}

button, input, textarea {
  font: inherit;
}

:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--accent) 85%, white 15%);
  outline-offset: 3px;
}

::selection {
  background: color-mix(in srgb, var(--accent) 25%, transparent);
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}

/* ----------------------------- */
/* 1) Design Tokens (CSS Vars)   */
/* ----------------------------- */
:root {
  /* Brand */
  --accent: #00fff1;
  --accent-2: #00bfae;

  /* Surfaces */
  --bg: #0f1220;
  --surface: #14182b;
  --surface-2: #1b2040;
  --surface-3: #23234b;

  /* Text */
  --text: #e9ebff;
  --muted: #b7bdd6;
  --muted-2: #8f97b6;

  /* Borders */
  --border: rgba(255, 255, 255, 0.10);
  --border-strong: rgba(0, 255, 241, 0.35);

  /* Shadow */
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.22);

  /* Radius / Spacing */
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 22px;
  --r-xl: 28px;

  --container: 1120px;

  --space-1: 6px;
  --space-2: 10px;
  --space-3: 14px;
  --space-4: 18px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 44px;
  --space-8: 64px;

  /* Typography scale */
  --fs-xs: 0.85rem;
  --fs-sm: 0.95rem;
  --fs-md: 1.05rem;
  --fs-lg: 1.2rem;
  --fs-xl: 1.6rem;
  --fs-2xl: 2.1rem;
  --fs-3xl: 2.7rem;

  /* Gradients */
  --grad-hero: radial-gradient(1200px 600px at 20% -10%, rgba(0,255,241,0.22), transparent 60%),
              radial-gradient(900px 500px at 80% 10%, rgba(255,255,255,0.08), transparent 55%),
              linear-gradient(120deg, rgba(35,35,75,0.9) 0%, rgba(15,18,32,0.95) 55%, rgba(15,18,32,1) 100%);

  --grad-card: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
}

/* ----------------------------- */
/* 2) Layout Helpers             */
/* ----------------------------- */
.site-header,
.site-footer {
  width: 100%;
}

.home-main,
.level-page,
.session-page {
  width: min(var(--container), calc(100% - 2rem));
  margin: 0 auto;
  padding: var(--space-6) 0 var(--space-8);
}

.section-head {
  margin-bottom: var(--space-4);
}

.section-title {
  font-size: var(--fs-xl);
  margin: 0 0 var(--space-2);
  letter-spacing: 0.2px;
}

.section-subtitle {
  margin: 0;
  color: var(--muted);
  max-width: 72ch;
}

.grid {
  display: grid;
  gap: var(--space-4);
}

.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

@media (max-width: 980px) {
  .grid--3 { grid-template-columns: 1fr; }
  .grid--2 { grid-template-columns: 1fr; }
}

/* ----------------------------- */
/* 3) Accessibility / Utilities  */
/* ----------------------------- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 12px;
  padding: 10px 12px;
  background: var(--surface-3);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  z-index: 9999;
}

.skip-link:focus {
  left: 12px;
}

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

.muted { color: var(--muted); }
.accent { color: var(--accent); }

.divider {
  border: 0;
  border-top: 1px solid var(--border);
  margin: var(--space-4) 0;
}

.noscript {
  margin-top: var(--space-5);
  padding: var(--space-4);
  border: 1px dashed var(--border);
  border-radius: var(--r-md);
  background: color-mix(in srgb, var(--surface) 80%, black 20%);
  color: var(--muted);
}

/* Fallback cuando no cargan componentes */
.component-fallback {
  padding: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--surface);
  color: var(--muted);
}

/* ----------------------------- */
/* 4) Hero (Home)                */
/* ----------------------------- */
.hero {
  position: relative;
  border-radius: var(--r-xl);
  overflow: hidden;
  padding: clamp(20px, 4vw, 42px);
  background: var(--grad-hero);
  box-shadow: var(--shadow);
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--space-6);
  align-items: center;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(500px 250px at 15% 25%, rgba(0,255,241,0.16), transparent 60%),
    radial-gradient(500px 250px at 85% 40%, rgba(0,255,241,0.10), transparent 60%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cg fill='none' stroke='rgba(255,255,255,0.06)'%3E%3Cpath d='M0 60h120M60 0v120'/%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.9;
  pointer-events: none;
}

.hero__content,
.hero__visual {
  position: relative;
  z-index: 1;
}

.hero__kicker {
  margin: 0 0 var(--space-2);
  color: var(--muted);
  font-size: var(--fs-sm);
}

.hero__title {
  margin: 0 0 var(--space-3);
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.15;
  letter-spacing: 0.2px;
}

.hero__title-accent {
  color: var(--accent);
  text-shadow: 0 0 18px rgba(0,255,241,0.18);
}

.hero__subtitle {
  margin: 0 0 var(--space-4);
  color: var(--muted);
  font-size: var(--fs-lg);
  max-width: 70ch;
}

.hero__cta {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-4);
}

.hero__trust {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-2) 70%, transparent);
  color: var(--muted);
  font-size: var(--fs-sm);
}

.pill__dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 14px rgba(0,255,241,0.25);
}

.glow-card {
  border-radius: var(--r-xl);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-3) 85%, black 15%);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.glow-card__top {
  display: flex;
  gap: 10px;
  padding: var(--space-4);
  border-bottom: 1px solid var(--border);
  background: var(--grad-card);
}

.glow-card__code {
  padding: var(--space-4);
}

.glow-card__code pre {
  margin: 0;
  padding: 0;
  overflow: auto;
  max-height: 220px;
  background: transparent;
  color: #d7dcff;
  font-size: 0.95rem;
  line-height: 1.5;
}

.glow-card__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4);
  border-top: 1px solid var(--border);
}

.hint {
  color: var(--muted-2);
  font-size: var(--fs-sm);
}

.spark {
  width: 38px;
  height: 38px;
  border-radius: 999px;
  background: radial-gradient(circle at 30% 30%, white 0%, rgba(255,255,255,0.12) 22%, rgba(0,255,241,0.22) 55%, transparent 70%);
  box-shadow: 0 0 22px rgba(0,255,241,0.18);
}

@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
  }
}

/* ----------------------------- */
/* 5) Search blocks              */
/* ----------------------------- */
.search,
.level-search {
  margin-top: var(--space-6);
}

.search__form {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  align-items: center;
  margin-top: var(--space-3);
}

.search__input {
  flex: 1 1 340px;
  min-width: 240px;
  padding: 14px 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 70%, black 30%);
  color: var(--text);
}

.search__input::placeholder {
  color: color-mix(in srgb, var(--muted) 70%, transparent);
}

.search__hint {
  margin: var(--space-3) 0 0;
  color: var(--muted);
  font-size: var(--fs-sm);
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* Chips */
.chip {
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-2) 55%, transparent);
  color: var(--muted);
  border-radius: 999px;
  padding: 6px 10px;
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease;
}

.chip:hover {
  transform: translateY(-1px);
  border-color: var(--border-strong);
}

.chip--static {
  cursor: default;
}

/* ----------------------------- */
/* 6) Breadcrumbs                */
/* ----------------------------- */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: var(--fs-sm);
  margin: 0 0 var(--space-4);
}

.breadcrumbs__link {
  color: var(--muted);
  border-bottom: 1px dashed transparent;
}

.breadcrumbs__link:hover {
  border-bottom-color: color-mix(in srgb, var(--accent) 55%, transparent);
  color: var(--text);
}

.breadcrumbs__current {
  color: var(--text);
}

.breadcrumbs__sep {
  opacity: 0.6;
}

/* ----------------------------- */
/* 7) Cards (Base)               */
/* ----------------------------- */
.card {
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-3) 82%, black 18%);
  box-shadow: 0 6px 18px rgba(0,0,0,0.22);
  padding: var(--space-5);
}

.card__title {
  margin: 0 0 var(--space-2);
  font-size: var(--fs-lg);
  letter-spacing: 0.2px;
}

.card__text {
  margin: 0;
  color: var(--muted);
}

.card__list {
  margin: var(--space-3) 0 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.card__meta {
  display: inline-block;
  margin-top: var(--space-3);
  color: var(--muted-2);
  font-size: var(--fs-sm);
}

.card--link {
  display: block;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.card--link:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  box-shadow: 0 10px 26px rgba(0,0,0,0.32);
}

.card--panel {
  padding: var(--space-5);
}

/* Sesiones cards */
.card--session {
  display: block;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.card--session:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  box-shadow: 0 10px 26px rgba(0,0,0,0.32);
}

.card__meta-top {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: var(--space-3);
}

.card__chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: var(--space-3);
}

.card__cta {
  display: inline-block;
  margin-top: var(--space-4);
  color: var(--accent);
  font-weight: 700;
}

/* ----------------------------- */
/* 8) Badges                     */
/* ----------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(0,255,241,0.12);
  border: 1px solid rgba(0,255,241,0.25);
  color: var(--text);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.2px;
}

.badge--muted {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  color: var(--muted);
  font-weight: 600;
}

/* ----------------------------- */
/* 9) Level Hero                 */
/* ----------------------------- */
.level-hero {
  border-radius: var(--r-xl);
  background: var(--grad-hero);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: clamp(18px, 3vw, 34px);
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-5);
  align-items: start;
}

.level-hero__kicker {
  margin: 0 0 var(--space-2);
  color: var(--muted);
  font-size: var(--fs-sm);
}

.level-hero__title {
  margin: 0 0 var(--space-3);
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  line-height: 1.15;
}

.level-hero__subtitle {
  margin: 0 0 var(--space-4);
  color: var(--muted);
  font-size: var(--fs-md);
  max-width: 70ch;
}

.level-hero__actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-4);
}

.level-hero__pills {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

@media (max-width: 980px) {
  .level-hero { grid-template-columns: 1fr; }
}

/* ----------------------------- */
/* 10) Session Hero + Layout     */
/* ----------------------------- */
.session-hero {
  border-radius: var(--r-xl);
  background: var(--grad-hero);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: clamp(18px, 3vw, 34px);
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-5);
  align-items: start;
}

.session-hero__meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: var(--space-3);
}

.session-hero__title {
  margin: 0 0 var(--space-3);
  font-size: clamp(1.9rem, 3vw, 2.7rem);
  line-height: 1.12;
}

.session-hero__subtitle {
  margin: 0 0 var(--space-4);
  color: var(--muted);
  font-size: var(--fs-lg);
  max-width: 80ch;
}

.session-hero__actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-4);
}

.session-hero__pills {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

@media (max-width: 980px) {
  .session-hero { grid-template-columns: 1fr; }
}

.session-layout {
  margin-top: var(--space-6);
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: var(--space-5);
  align-items: start;
}

@media (max-width: 980px) {
  .session-layout { grid-template-columns: 1fr; }
}

/* TOC */
.toc {
  position: sticky;
  top: 88px;
  align-self: start;
}

@media (max-width: 980px) {
  .toc { position: relative; top: 0; }
}

.toc__card {
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-3) 82%, black 18%);
  box-shadow: var(--shadow-soft);
  padding: var(--space-5);
}

.toc__title {
  margin: 0 0 var(--space-3);
  font-weight: 800;
  color: var(--text);
}

.toc__list {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.toc__list a {
  color: var(--muted);
  border-bottom: 1px dashed transparent;
}

.toc__list a:hover {
  color: var(--text);
  border-bottom-color: color-mix(in srgb, var(--accent) 60%, transparent);
}

/* Content blocks */
.session-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.content-block {
  border-radius: var(--r-xl);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 65%, black 35%);
  box-shadow: var(--shadow-soft);
  padding: clamp(18px, 2.5vw, 30px);
}

.content-block h2 {
  margin: 0 0 var(--space-3);
  font-size: var(--fs-xl);
}

.content-block h3 {
  margin: var(--space-4) 0 var(--space-2);
  font-size: var(--fs-lg);
}

.content-block p {
  margin: 0 0 var(--space-3);
  color: var(--muted);
  font-size: var(--fs-md);
}

.bullets,
.steps {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.steps {
  display: grid;
  gap: 8px;
}

.code-card {
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  background: color-mix(in srgb, #0b0e19 70%, var(--surface-3) 30%);
  padding: var(--space-4);
  overflow: auto;
}

.code-card pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  color: #d7dcff;
  font-size: 0.95rem;
  line-height: 1.55;
}

/* Callouts */
.callout {
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  padding: var(--space-4);
  background: rgba(255,255,255,0.04);
  margin: var(--space-4) 0;
}

.callout__title {
  margin: 0 0 8px;
  font-weight: 900;
  letter-spacing: 0.2px;
}

.callout__text {
  margin: 0;
  color: var(--muted);
}

.callout--info {
  border-color: rgba(0,255,241,0.22);
  background: rgba(0,255,241,0.06);
}

.callout--tip {
  border-color: rgba(0,191,174,0.25);
  background: rgba(0,191,174,0.06);
}

.callout--warning {
  border-color: rgba(255,179,0,0.22);
  background: rgba(255,179,0,0.06);
}

.callout--success {
  border-color: rgba(0,255,241,0.25);
  background: rgba(0,255,241,0.05);
}

/* Checklist */
.checklist {
  margin: var(--space-3) 0 0;
  padding-left: 1.1rem;
  color: var(--muted);
  display: grid;
  gap: 8px;
}

/* Embedded blocks (component containers) */
.embed-block {
  border-radius: var(--r-lg);
  border: 1px dashed var(--border);
  background: rgba(255,255,255,0.03);
  padding: var(--space-4);
}

/* Next navigation */
.nav-next {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-top: var(--space-4);
}

/* ----------------------------- */
/* 11) Progress bar              */
/* ----------------------------- */
.progress {
  margin-top: var(--space-3);
}

.progress__row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: var(--fs-sm);
  margin-bottom: 10px;
}

.progress__bar {
  width: 100%;
  height: 12px;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--border);
  overflow: hidden;
}

.progress__fill {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 18px rgba(0,255,241,0.16);
}

.progress__hint {
  margin: var(--space-3) 0 0;
  color: var(--muted-2);
  font-size: var(--fs-sm);
}

/* ----------------------------- */
/* 12) CTA section               */
/* ----------------------------- */
.cta {
  margin-top: var(--space-7);
}

.cta__panel {
  border-radius: var(--r-xl);
  border: 1px solid var(--border);
  background: linear-gradient(120deg, rgba(0,255,241,0.10), rgba(255,255,255,0.03));
  box-shadow: var(--shadow-soft);
  padding: clamp(18px, 2.5vw, 32px);
}

.cta__title {
  margin: 0 0 var(--space-2);
  font-size: var(--fs-xl);
}

.cta__text {
  margin: 0 0 var(--space-4);
  color: var(--muted);
  font-size: var(--fs-md);
  max-width: 80ch;
}

.cta__actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* ----------------------------- */
/* 13) Mini links/actions        */
/* ----------------------------- */
.mini-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.mini-links__item {
  color: var(--muted);
  border-bottom: 1px dashed transparent;
}

.mini-links__item:hover {
  color: var(--text);
  border-bottom-color: color-mix(in srgb, var(--accent) 60%, transparent);
}

.mini-actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.hint-text {
  margin: var(--space-3) 0 0;
  color: var(--muted-2);
  font-size: var(--fs-sm);
}

/* ----------------------------- */
/* 14) Sessions page empty state */
/* ----------------------------- */
.sessions__empty {
  margin: var(--space-4) 0 0;
  color: var(--muted);
  padding: var(--space-4);
  border-radius: var(--r-lg);
  border: 1px dashed var(--border);
  background: rgba(255,255,255,0.03);
}