/* ══════════════════════════════════════════════════════════
   HOST CELL LAB SUITE — Material Design 3
   ══════════════════════════════════════════════════════════ */

/* ── MD3 Color Tokens ────────────────────────────────────── */
:root {
  /* Primary — biotech blue */
  --md-primary:               #1558D6;
  --md-on-primary:            #FFFFFF;
  --md-primary-container:     #D9E3FF;
  --md-on-primary-container:  #00154B;

  /* Secondary — deep teal (tools avanzadas) */
  --md-secondary:             #006B53;
  --md-on-secondary:          #FFFFFF;
  --md-secondary-container:   #7FF8D2;
  --md-on-secondary-container:#002018;

  /* Tertiary — science violet (educación) */
  --md-tertiary:              #6B3FAB;
  --md-on-tertiary:           #FFFFFF;
  --md-tertiary-container:    #ECDDFF;
  --md-on-tertiary-container: #250060;

  /* Surface family */
  --md-background:            #F4F6FF;
  --md-surface:               #FAFCFF;
  --md-surface-variant:       #E1E4F0;
  --md-on-surface:            #191C20;
  --md-on-surface-variant:    #44474F;

  /* Containers (tonal elevation) */
  --md-surface-container-lowest:  #FFFFFF;
  --md-surface-container-low:     #F4F7FF;
  --md-surface-container:         #EEF1FA;
  --md-surface-container-high:    #E8EBF4;
  --md-surface-container-highest: #E3E5EE;

  /* Outline */
  --md-outline:         #74777F;
  --md-outline-variant: #C4C7D0;

  /* ── MD3 Shape Scale ──────────────────────────────────── */
  --md-shape-xs:    4px;
  --md-shape-sm:    8px;
  --md-shape-md:    12px;
  --md-shape-lg:    16px;
  --md-shape-xl:    28px;
  --md-shape-full:  9999px;

  /* ── MD3 Elevation (tonal shadows, not color overlays) ── */
  --md-elevation-1: 0 1px 2px rgba(0,0,0,0.30), 0 1px 3px 1px rgba(0,0,0,0.15);
  --md-elevation-2: 0 1px 2px rgba(0,0,0,0.30), 0 2px 6px 2px rgba(0,0,0,0.15);
  --md-elevation-3: 0 4px 8px 3px rgba(0,0,0,0.15), 0 1px 3px rgba(0,0,0,0.30);

  /* ── MD3 Motion ───────────────────────────────────────── */
  --md-easing-standard:   cubic-bezier(0.2, 0, 0, 1);
  --md-easing-emphasized: cubic-bezier(0.2, 0, 0, 1);
  --md-duration-short:    200ms;
  --md-duration-medium:   300ms;
  --md-duration-long:     500ms;

  /* ── Layout ───────────────────────────────────────────── */
  --app-bar-height:    64px;
  --footer-height:     56px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--app-bar-height) + 32px);
}

body {
  font-family: 'Roboto', 'Google Sans', system-ui, sans-serif;
  background: var(--md-background);
  color: var(--md-on-surface);
  min-height: 100vh;
  padding-top: var(--app-bar-height);
  padding-bottom: var(--footer-height);
  -webkit-font-smoothing: antialiased;
}

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

/* ══════════════════════════════════════════════════════════
   MD3 TOP APP BAR (Small)
   ══════════════════════════════════════════════════════════ */
.md-top-app-bar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--app-bar-height);
  z-index: 1000;
  background: var(--md-surface);
  /* No shadow at rest — MD3 uses tonal elevation, not shadows */
  transition:
    background var(--md-duration-short) var(--md-easing-standard),
    box-shadow  var(--md-duration-short) var(--md-easing-standard);
}

/* On scroll: surface-container background = tonal elevation level 2 */
.md-top-app-bar.scrolled {
  background: var(--md-surface-container);
  box-shadow: var(--md-elevation-2);
}

.md-top-app-bar__row {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  gap: 1rem;
}

.md-top-app-bar__leading {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  flex: 1 1 auto;
  overflow: hidden;
}

/* ── 4-dot brand mark ────────────────────────────────────── */
.hc-logo-mark {
  flex-shrink: 0;
  width: 40px; height: 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5px;
  padding: 7px;
  background: var(--md-surface-container-lowest);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-md);
}

.hc-logo-dot {
  border-radius: 50%;
  width: 100%; height: 100%;
}

.hc-brand {
  min-width: 0;
  line-height: 1;
}

/* MD3 Title Large */
.hc-brand__name {
  font-family: 'Google Sans', 'Roboto', sans-serif;
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: 0;
  color: var(--md-on-surface);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: block;
}

/* MD3 Label Medium */
.hc-brand__tagline {
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  font-weight: 400;
  color: var(--md-on-surface-variant);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: block;
  margin-top: 1px;
}

/* ── MD3 Tonal Button ────────────────────────────────────── */
.md-button-tonal {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.6rem 1.5rem;
  border-radius: var(--md-shape-full);
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  font-family: 'Google Sans', 'Roboto', sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.006em;
  overflow: hidden;
  flex-shrink: 0;
  transition: box-shadow var(--md-duration-short) var(--md-easing-standard);
}

.md-button-tonal::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--md-on-secondary-container);
  opacity: 0;
  transition: opacity var(--md-duration-short) var(--md-easing-standard);
}

.md-button-tonal:hover::before  { opacity: 0.08; }
.md-button-tonal:active::before { opacity: 0.12; }
.md-button-tonal:hover { box-shadow: var(--md-elevation-1); }

/* ══════════════════════════════════════════════════════════
   HERO
   ══════════════════════════════════════════════════════════ */
.hc-hero {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
  padding: 5rem 2rem 4.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* Decorative background shapes — MD3 loves expressive geometry */
.hc-hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.hc-hero__bg-blob {
  position: absolute;
  border-radius: 50%;
  opacity: 0.35;
}

.hc-hero__bg-blob:nth-child(1) {
  width: 360px; height: 360px;
  top: -120px; right: -80px;
  background: radial-gradient(circle, #A0B9FF 0%, transparent 70%);
}

.hc-hero__bg-blob:nth-child(2) {
  width: 280px; height: 280px;
  bottom: -100px; left: -60px;
  background: radial-gradient(circle, #7FF8D2 0%, transparent 70%);
}

.hc-hero__bg-blob:nth-child(3) {
  width: 200px; height: 200px;
  top: 20%; left: 5%;
  background: radial-gradient(circle, #ECDDFF 0%, transparent 70%);
  opacity: 0.5;
}

.hc-hero__content {
  position: relative;
  z-index: 1;
  max-width: 680px;
  margin: 0 auto;
}

/* Big logo mark in hero */
.hc-hero__logo {
  width: 72px; height: 72px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 12px;
  background: var(--md-surface-container-lowest);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-xl);
  box-shadow: var(--md-elevation-2);
  margin: 0 auto 1.75rem;
}

/* MD3 Display Medium */
.hc-hero__title {
  font-family: 'Google Sans', 'Roboto', sans-serif;
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 400;    /* MD3 Display uses Regular weight — it lets size do the work */
  letter-spacing: -0.01em;
  line-height: 1.15;
  color: var(--md-on-primary-container);
  margin-bottom: 1rem;
}

/* MD3 Body Large */
.hc-hero__body {
  font-size: 1rem;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: color-mix(in srgb, var(--md-on-primary-container) 80%, transparent);
  margin-bottom: 2rem;
}

/* Assist chips row */
.hc-hero__chips {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.hc-assist-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0.4rem 1rem;
  border-radius: var(--md-shape-full);
  background: rgba(255,255,255,0.55);
  border: 1px solid rgba(255,255,255,0.7);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--md-on-primary-container);
  backdrop-filter: blur(4px);
}

.hc-assist-chip svg {
  opacity: 0.7;
}

/* MD3 Extended FAB (acting as CTA) */
.md-button-filled {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.75rem 1.75rem;
  border-radius: var(--md-shape-full);
  background: var(--md-primary);
  color: var(--md-on-primary);
  font-family: 'Google Sans', 'Roboto', sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.006em;
  overflow: hidden;
  transition: box-shadow var(--md-duration-short) var(--md-easing-standard);
  box-shadow: var(--md-elevation-1);
}

.md-button-filled::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--md-on-primary);
  opacity: 0;
  transition: opacity var(--md-duration-short) var(--md-easing-standard);
}

.md-button-filled:hover::before  { opacity: 0.08; }
.md-button-filled:active::before { opacity: 0.12; }
.md-button-filled:hover { box-shadow: var(--md-elevation-2); }

/* ══════════════════════════════════════════════════════════
   CONTENT AREA
   ══════════════════════════════════════════════════════════ */
.hc-content {
  max-width: 1120px;
  margin: 0 auto;
  padding: 3rem 1.5rem 3rem;
}

/* ══════════════════════════════════════════════════════════
   SECTION
   ══════════════════════════════════════════════════════════ */
.hc-section {
  margin-bottom: 4rem;
}

.hc-section__header {
  margin-bottom: 1.5rem;
}

/* MD3 Suggestion Chip used as category label */
.hc-category-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.4rem 1rem 0.4rem 0.5rem;
  border-radius: var(--md-shape-full);
  font-family: 'Google Sans', 'Roboto', sans-serif;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.006em;
  margin-bottom: 0.75rem;
}

.hc-category-chip--primary {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
}

.hc-category-chip--secondary {
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
}

.hc-category-chip--tertiary {
  background: var(--md-tertiary-container);
  color: var(--md-on-tertiary-container);
}

.hc-category-chip__num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px; height: 24px;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.hc-category-chip--primary   .hc-category-chip__num { background: var(--md-primary);   color: var(--md-on-primary); }
.hc-category-chip--secondary .hc-category-chip__num { background: var(--md-secondary); color: var(--md-on-secondary); }
.hc-category-chip--tertiary  .hc-category-chip__num { background: var(--md-tertiary);  color: var(--md-on-tertiary); }

/* MD3 Headline Medium */
.hc-section__title {
  font-family: 'Google Sans', 'Roboto', sans-serif;
  font-size: 1.625rem;
  font-weight: 400;   /* MD3 Headline is Regular — expressive not heavy */
  letter-spacing: 0;
  line-height: 1.3;
  color: var(--md-on-surface);
  margin-bottom: 0.25rem;
}

/* MD3 Body Medium */
.hc-section__sub {
  font-size: 0.875rem;
  line-height: 1.5;
  letter-spacing: 0.016em;
  color: var(--md-on-surface-variant);
}

/* ══════════════════════════════════════════════════════════
   TOOL GRID
   ══════════════════════════════════════════════════════════ */
.hc-tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
}

/* ══════════════════════════════════════════════════════════
   MD3 ELEVATED CARD
   ══════════════════════════════════════════════════════════ */
.md-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--md-surface-container-low);
  border-radius: var(--md-shape-lg);         /* MD3 Large shape = 16dp */
  box-shadow: var(--md-elevation-1);
  overflow: hidden;
  color: var(--md-on-surface);
  text-decoration: none;
  transition:
    box-shadow var(--md-duration-short) var(--md-easing-standard),
    transform  var(--md-duration-short) var(--md-easing-emphasized);
}

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

/* MD3 State Layer — overlaid on top of card content */
.md-state-layer {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--md-primary);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--md-duration-short) var(--md-easing-standard);
  z-index: 0;
}

.md-card:hover .md-state-layer  { opacity: 0.08; }
.md-card:active .md-state-layer { opacity: 0.12; }

/* Secondary cards */
.md-card--secondary .md-state-layer { background: var(--md-secondary); }
.md-card--tertiary  .md-state-layer { background: var(--md-tertiary); }

/* ── Card inner layout ───────────────────────────────────── */
.md-card__media {
  position: relative;
  z-index: 1;
  padding: 1.25rem 1.25rem 0;
}

.md-card__icon-container {
  width: 48px; height: 48px;
  border-radius: var(--md-shape-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.md-card__icon-container--primary   { background: var(--md-primary-container); }
.md-card__icon-container--secondary { background: var(--md-secondary-container); }
.md-card__icon-container--tertiary  { background: var(--md-tertiary-container); }

.md-card__body {
  position: relative;
  z-index: 1;
  padding: 0.85rem 1.25rem;
  flex: 1;
}

/* MD3 Title Medium */
.md-card__title {
  font-family: 'Google Sans', 'Roboto', sans-serif;
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.009em;
  line-height: 1.4;
  color: var(--md-on-surface);
  margin-bottom: 0.5rem;
}

/* MD3 Body Small */
.md-card__supporting {
  font-size: 0.8125rem;
  line-height: 1.55;
  letter-spacing: 0.025em;
  color: var(--md-on-surface-variant);
}

.md-card__actions {
  position: relative;
  z-index: 1;
  padding: 0 1.25rem 1.1rem;
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

/* MD3 Text button with arrow */
.md-card__action-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: 'Google Sans', 'Roboto', sans-serif;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.006em;
  color: var(--md-primary);
  border-radius: var(--md-shape-full);
  padding: 0.35rem 0.5rem;
}

.md-card--secondary .md-card__action-btn { color: var(--md-secondary); }
.md-card--tertiary  .md-card__action-btn { color: var(--md-tertiary); }

.md-card__action-btn svg {
  transition: transform var(--md-duration-short) var(--md-easing-emphasized);
}

.md-card:hover .md-card__action-btn svg {
  transform: translateX(4px);
}

/* ══════════════════════════════════════════════════════════
   MD3 FOOTER (navigation bar feel)
   ══════════════════════════════════════════════════════════ */
.hc-footer {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: var(--footer-height);
  background: var(--md-surface-container);
  border-top: 1px solid var(--md-outline-variant);
  box-shadow: 0 -1px 0 var(--md-outline-variant);
  z-index: 1000;
}

.hc-footer__inner {
  height: 100%;
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  gap: 1rem;
  max-width: 1120px;
  margin: 0 auto;
}

.hc-footer__brand {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

/* MD3 Label Large */
.hc-footer__name {
  font-family: 'Google Sans', 'Roboto', sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.006em;
  color: var(--md-primary);
  white-space: nowrap;
}

/* MD3 Label Small */
.hc-footer__slogan {
  font-size: 0.6875rem;
  letter-spacing: 0.03em;
  color: var(--md-on-surface-variant);
  font-style: italic;
  white-space: nowrap;
}

/* MD3 Label Medium */
.hc-footer__author {
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: var(--md-on-surface-variant);
  white-space: nowrap;
  margin-left: auto;
}

/* GitHub — outlined button style */
.hc-footer__github {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 0.44rem 1.05rem;
  border-radius: var(--md-shape-full);
  background: #1e2330;
  color: #FFFFFF;
  font-family: 'Google Sans', 'Roboto', sans-serif;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.006em;
  overflow: hidden;
  flex-shrink: 0;
  transition: box-shadow var(--md-duration-short) var(--md-easing-standard);
  box-shadow: var(--md-elevation-1);
}

.hc-footer__github::before {
  content: '';
  position: absolute;
  inset: 0;
  background: #FFFFFF;
  opacity: 0;
  transition: opacity var(--md-duration-short) var(--md-easing-standard);
}

.hc-footer__github:hover::before  { opacity: 0.08; }
.hc-footer__github:hover { box-shadow: var(--md-elevation-2); }
.hc-footer__github svg { flex-shrink: 0; position: relative; z-index: 1; }
.hc-footer__github span { position: relative; z-index: 1; }

/* ══════════════════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════════════════ */
@media (max-width: 900px) {
  .hc-hero { padding: 3.5rem 1.5rem 3rem; }
  .hc-content { padding: 2.5rem 1.25rem 2.5rem; }
}

@media (max-width: 680px) {
  :root {
    --app-bar-height: 56px;
    --footer-height:  68px;
  }

  .md-top-app-bar__row { padding: 0 1rem; }
  .hc-brand__tagline { display: none; }

  .hc-hero { padding: 3rem 1.25rem 2.5rem; }
  .hc-hero__logo { width: 60px; height: 60px; }

  .hc-content { padding: 2rem 1rem 2rem; }
  .hc-tool-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
  .hc-section { margin-bottom: 3rem; }

  .hc-footer__inner { padding: 0 1rem; gap: 0.5rem; }
  .hc-footer__author { display: none; }
}

@media (max-width: 480px) {
  .hc-tool-grid { grid-template-columns: 1fr; }
  .hc-hero__chips { gap: 0.4rem; }
}