/* ==========================================================================
   ARMOS — Human-AI Symbiosis Research Lab
   Bloque 02: Identidad Visual y Accesibilidad
   Aesthetic: Deep Navy, Graphite Black, Cyan Accents, Soft White, Silver Grey,
              and Discrete Elegant Gold Details
   Pure Vanilla CSS — Zero External Dependencies — WCAG 2.1 AA/AAA Compliant
   ========================================================================== */

:root {
  /* ------------------------------------------------------------------------
     1. Design Tokens: Color Palette (Block 02 & Backward-Compatible Aliases)
     ------------------------------------------------------------------------ */
  /* Deep Navy Foundations */
  --bg-darkest: #04070e;
  --bg-primary: #070c18;
  --color-navy-base: var(--bg-darkest);
  --color-navy-deep: var(--bg-primary);
  --color-navy-surface: #0b1324;
  --color-navy-glass: rgba(7, 12, 24, 0.94);

  /* Graphite Black Surfaces & Cards */
  --color-graphite-card: #111a2e;
  --color-graphite-card-hover: #16223b;
  --color-graphite-card-glass: rgba(17, 26, 46, 0.85);
  --color-border-subtle: rgba(148, 163, 184, 0.14);
  --color-border-medium: rgba(56, 189, 248, 0.24);
  --color-border-strong: rgba(56, 189, 248, 0.45);

  /* Cyan Accents (Scientific Innovation) */
  --cyan-primary: #06b6d4;
  --cyan-bright: #38bdf8;
  --color-cyan-primary: var(--cyan-primary);
  --color-cyan-bright: var(--cyan-bright);
  --color-cyan-deep: #0284c7;
  --color-cyan-glow: rgba(56, 189, 248, 0.18);
  --color-cyan-glow-intense: rgba(56, 189, 248, 0.35);

  /* Soft White & Silver Grey Typography */
  --color-text-white: #ffffff;
  --color-text-soft: #f8fafc;
  --color-silver-light: #e2e8f0;
  --color-silver-mid: #cbd5e1;
  --color-silver-muted: #94a3b8;
  --color-slate-dim: #64748b;

  /* Discreet Gold Accents (Prestige & Ethical Alignment) */
  --color-gold-accent: #d4af37;
  --color-gold-light: #f5d77f;
  --color-gold-dim: rgba(212, 175, 55, 0.15);
  --color-gold-border: rgba(212, 175, 55, 0.28);

  /* ------------------------------------------------------------------------
     2. Typography Tokens
     ------------------------------------------------------------------------ */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  /* ------------------------------------------------------------------------
     3. Layout, Spacing & Elevation
     ------------------------------------------------------------------------ */
  --container-max: 1240px;
  --container-padding: clamp(1rem, 4vw, 2.25rem);
  --header-height: 76px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-pill: 9999px;

  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.6), 0 0 1px rgba(255, 255, 255, 0.08);
  --shadow-card-hover: 0 16px 36px -10px rgba(0, 0, 0, 0.75), 0 0 20px var(--color-cyan-glow);
  --shadow-btn: 0 4px 18px var(--color-cyan-glow);

  --transition-fast: all 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: all 0.26s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--color-navy-base);
  color: var(--color-text-soft);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  width: 100%;
  max-width: 100%;
}

body {
  min-height: 100vh;
  width: 100%;
  max-width: 100%;
  background: radial-gradient(circle at 50% -10%, #0d1a38 0%, var(--color-navy-deep) 60%, var(--color-navy-base) 100%);
  background-attachment: fixed;
  color: var(--color-text-soft);
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}

/* --------------------------------------------------------------------------
   Accessibility: Focus Management & Skip Link
   -------------------------------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--color-cyan-bright);
  outline-offset: 3px;
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  top: -80px;
  left: 20px;
  background: var(--color-cyan-bright);
  color: var(--color-navy-base);
  padding: 12px 20px;
  font-size: 0.92rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  z-index: 10000;
  text-decoration: none;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
  transition: top 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.skip-link:focus {
  top: 16px;
}

/* Layout Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
  box-sizing: border-box;
}

/* --------------------------------------------------------------------------
   Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  height: var(--header-height);
  background-color: var(--color-navy-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border-subtle);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: var(--transition-smooth);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

/* Brand Link & Typography */
.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
  border-radius: var(--radius-sm);
  transition: opacity 0.2s ease;
}

.brand-link:hover {
  opacity: 0.92;
}

.brand-emblem {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--color-text-white);
  line-height: 1.05;
}

.brand-subtitle-mini {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-cyan-bright);
  text-transform: uppercase;
}

/* Primary Desktop Navigation */
.primary-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 4px;
  align-items: center;
}

.nav-link {
  display: inline-block;
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-silver-mid);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--color-text-white);
  background-color: rgba(56, 189, 248, 0.08);
}

.nav-link.active {
  color: var(--color-cyan-bright);
  font-weight: 600;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 14px;
  right: 14px;
  height: 2px;
  background-color: var(--color-cyan-bright);
  border-radius: 2px;
}

/* Accessible Mobile Nav Toggle Button */
.mobile-nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  color: var(--color-text-white);
  padding: 8px 10px;
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

.mobile-nav-toggle:hover {
  border-color: var(--color-cyan-bright);
  background: rgba(56, 189, 248, 0.1);
}

.mobile-nav-icon {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  position: relative;
  padding-top: clamp(2.5rem, 6vw, 5.5rem);
  padding-bottom: clamp(3rem, 7vw, 6.5rem);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Institutional Badge with subtle Gold Accent */
.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  background: rgba(11, 19, 36, 0.85);
  border: 1px solid var(--color-border-medium);
  border-left: 2px solid var(--color-gold-accent);
  border-radius: var(--radius-pill);
  width: fit-content;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-silver-light);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

.hero-pill-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-cyan-bright);
  box-shadow: 0 0 8px var(--color-cyan-bright);
  animation: pulse-node 2.4s infinite ease-in-out;
}

.hero-title-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.hero-brand {
  font-size: clamp(2.8rem, 6.5vw, 4.8rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--color-text-white);
  background: linear-gradient(135deg, #ffffff 40%, #cbd5e1 75%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle-exact {
  font-size: clamp(1.15rem, 2.5vw, 1.85rem);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--color-cyan-bright);
  line-height: 1.25;
}

.hero-description {
  font-size: clamp(1rem, 1.3vw, 1.15rem);
  color: var(--color-silver-mid);
  max-width: 620px;
  line-height: 1.75;
}

/* Call to Action Buttons (Tactile & Accessible) */
.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.4rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-smooth);
  min-height: 48px;
  line-height: 1;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-cyan-bright) 0%, var(--color-cyan-primary) 100%);
  color: var(--color-navy-base);
  border: 1px solid var(--color-cyan-bright);
  box-shadow: var(--shadow-btn);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #ffffff 0%, var(--color-cyan-bright) 100%);
  box-shadow: 0 6px 24px var(--color-cyan-glow-intense);
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(17, 26, 46, 0.75);
  color: var(--color-silver-light);
  border: 1px solid var(--color-border-medium);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(22, 34, 59, 0.95);
  color: var(--color-text-white);
  border-color: var(--color-cyan-bright);
  transform: translateY(-2px);
}

.btn-icon {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  stroke-width: 2.2;
  fill: none;
  transition: transform 0.2s ease;
}

.btn:hover .btn-icon {
  transform: translateX(3px);
}

/* Hero Conceptual Illustration Card */
.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.visual-canvas-card {
  width: 100%;
  max-width: 480px;
  box-sizing: border-box;
  background: linear-gradient(145deg, rgba(17, 26, 46, 0.9) 0%, rgba(11, 19, 36, 0.96) 100%);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  position: relative;
}

.visual-canvas-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 20%;
  right: 20%;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--color-cyan-bright) 50%, transparent 100%);
  opacity: 0.6;
}

.visual-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--color-border-subtle);
}

.visual-header-title {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--color-silver-mid);
  letter-spacing: 0.05em;
}

.visual-status-pill {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--color-cyan-bright);
}

.symbiosis-svg {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
}

/* --------------------------------------------------------------------------
   Provisional Navigation Area (Áreas del Laboratorio)
   One compact area with a short heading and one sentence per anchor
   -------------------------------------------------------------------------- */
.provisional-section {
  padding-top: 4.5rem;
  padding-bottom: 5.5rem;
  border-top: 1px solid var(--color-border-subtle);
  background-color: rgba(11, 19, 36, 0.45);
}

/* --------------------------------------------------------------------------
   BLOQUE 03: Sección Quiénes Somos / About ARMOS
   -------------------------------------------------------------------------- */
.about-section {
  padding-top: 5rem;
  padding-bottom: 5.5rem;
  border-top: 1px solid var(--color-border-subtle);
  background: radial-gradient(circle at 85% 15%, rgba(6, 182, 212, 0.05) 0%, transparent 60%);
}

.about-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 2rem;
  margin-bottom: 3rem;
}

.about-header-main {
  max-width: 780px;
}

.about-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-cyan-bright);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
}

.about-header-main .section-title {
  margin-bottom: 0.85rem;
}

.section-intro {
  font-size: clamp(1rem, 1.3vw, 1.15rem);
  color: var(--color-silver-mid);
  line-height: 1.75;
}

/* Local Language Switcher for About Section */
.about-lang-control {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  align-items: flex-start;
}

.about-lang-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-silver-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.about-lang-pill {
  display: inline-flex;
  background: var(--color-navy-surface);
  border: 1px solid var(--color-border-medium);
  border-radius: var(--radius-pill);
  padding: 3px;
  gap: 2px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.about-lang-btn {
  background: transparent;
  border: none;
  color: var(--color-silver-muted);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: var(--transition-fast);
  min-height: 34px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.about-lang-btn:hover {
  color: var(--color-text-white);
  background: rgba(56, 189, 248, 0.1);
}

.about-lang-btn.active {
  background: var(--color-cyan-bright);
  color: var(--color-navy-base);
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.4);
}

/* Grid of 4 About Cards */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
}

.about-card {
  background: var(--color-graphite-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 2.1rem 1.85rem;
  transition: var(--transition-smooth);
  scroll-margin-top: calc(var(--header-height) + 20px);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
  position: relative;
}

.about-card:hover {
  border-color: var(--color-border-medium);
  background: var(--color-graphite-card-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
}

.about-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.card-icon-box {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.22);
  color: var(--color-cyan-bright);
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-icon-box svg {
  width: 20px;
  height: 20px;
}

.card-meta-tag {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-silver-muted);
}

.about-card-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text-white);
  margin-bottom: 0.85rem;
  line-height: 1.3;
}

.about-card-text {
  font-size: 0.95rem;
  color: var(--color-silver-mid);
  line-height: 1.7;
  flex-grow: 1;
}

.card-note-box {
  margin-top: 1.35rem;
  padding: 0.9rem 1.1rem;
  background: rgba(212, 175, 55, 0.05);
  border-left: 2.5px solid var(--color-gold-accent);
  border-radius: var(--radius-sm);
  font-size: 0.86rem;
  color: var(--color-silver-light);
  line-height: 1.55;
}

.about-principles-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.35rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border-subtle);
}

.about-principles-list li {
  font-size: 0.88rem;
  color: var(--color-silver-light);
  line-height: 1.55;
  position: relative;
  padding-left: 1.25rem;
}

.about-principles-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  top: -1px;
  color: var(--color-cyan-bright);
  font-size: 1.2rem;
  line-height: 1;
}

/* --------------------------------------------------------------------------
   BLOQUE 04: Sección Líneas de Investigación / Research Lines
   -------------------------------------------------------------------------- */
.research-section {
  padding-top: 5rem;
  padding-bottom: 5.5rem;
  border-top: 1px solid var(--color-border-subtle);
  background: radial-gradient(circle at 15% 20%, rgba(56, 189, 248, 0.04) 0%, transparent 60%);
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.research-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 2rem;
  margin-bottom: 3rem;
}

.research-header-main {
  max-width: 780px;
}

.research-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-cyan-bright);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
}

.research-header-main .section-title {
  margin-bottom: 0.85rem;
}

/* Local Language Switcher for Research Section */
.research-lang-control {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  align-items: flex-start;
}

.research-lang-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-silver-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.research-lang-pill {
  display: inline-flex;
  background: var(--color-navy-surface);
  border: 1px solid var(--color-border-medium);
  border-radius: var(--radius-pill);
  padding: 3px;
  gap: 2px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.research-lang-btn {
  background: transparent;
  border: none;
  color: var(--color-silver-muted);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: var(--transition-fast);
  min-height: 34px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.research-lang-btn:hover {
  color: var(--color-text-white);
  background: rgba(56, 189, 248, 0.1);
}

.research-lang-btn.active {
  background: var(--color-cyan-bright);
  color: var(--color-navy-base);
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.4);
}

/* Grid of 6 Research Cards */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
}

.research-card {
  background: var(--color-graphite-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 2.1rem 1.85rem;
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
  position: relative;
}

.research-card:hover {
  border-color: var(--color-border-medium);
  background: var(--color-graphite-card-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
}

.research-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

/* Status Indicator: Research objective vs experimental direction */
.research-status-indicator {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  margin-bottom: 1rem;
  transition: var(--transition-fast);
}

.research-status-indicator[data-status="objective"] {
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--color-cyan-bright);
}

.research-status-indicator[data-status="experimental"] {
  background: rgba(212, 175, 55, 0.08);
  border: 1px solid rgba(212, 175, 55, 0.3);
  color: var(--color-gold-light);
}

.research-card-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text-white);
  margin-bottom: 0.85rem;
  line-height: 1.3;
}

.research-card-text {
  font-size: 0.95rem;
  color: var(--color-silver-mid);
  line-height: 1.7;
  flex-grow: 1;
}

.research-note-box {
  margin-top: 1.35rem;
  padding: 0.85rem 1.1rem;
  background: rgba(7, 12, 24, 0.6);
  border-left: 2.5px solid var(--color-cyan-bright);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  line-height: 1.55;
}

.research-card:last-child .research-note-box {
  border-left-color: var(--color-gold-accent);
}

.research-note-text {
  display: block;
  font-size: 0.84rem;
  color: var(--color-silver-muted);
}

/* Accessibility utility: Screen Reader Only */
.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;
}

.section-header {
  max-width: 760px;
  margin-bottom: 2.25rem;
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.3rem);
  font-weight: 700;
  color: var(--color-text-white);
  line-height: 1.25;
}

.provisional-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.provisional-item {
  background: var(--color-graphite-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 1.85rem 1.65rem;
  transition: var(--transition-smooth);
  scroll-margin-top: calc(var(--header-height) + 20px);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
  position: relative;
}

.provisional-item:hover {
  border-color: var(--color-border-medium);
  background: var(--color-graphite-card-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
}

.provisional-item-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.15rem;
}

.provisional-icon-wrapper {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
  color: var(--color-cyan-bright);
  display: flex;
  align-items: center;
  justify-content: center;
}

.provisional-icon-wrapper svg {
  width: 18px;
  height: 18px;
}

.provisional-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-silver-muted);
}

.provisional-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-white);
  margin-bottom: 0.7rem;
  line-height: 1.35;
}

.provisional-text {
  font-size: 0.95rem;
  color: var(--color-silver-mid);
  line-height: 1.65;
}

/* --------------------------------------------------------------------------
   Simple Institutional Footer
   -------------------------------------------------------------------------- */
.site-footer {
  margin-top: auto;
  background-color: var(--color-navy-base);
  border-top: 1px solid var(--color-border-subtle);
  padding-top: 4rem;
  padding-bottom: 2.75rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3.5rem;
  margin-bottom: 2.75rem;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.footer-brand-title {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--color-text-white);
}

.footer-exact-subtitle {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--color-cyan-bright);
  text-transform: uppercase;
}

.footer-summary {
  font-size: 0.92rem;
  color: var(--color-silver-muted);
  max-width: 520px;
  line-height: 1.7;
}

.footer-nav-heading {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-white);
  margin-bottom: 1.15rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--color-silver-mid);
  text-decoration: none;
  transition: color 0.2s ease;
  border-radius: var(--radius-sm);
  display: inline-block;
  width: fit-content;
}

.footer-links a:hover {
  color: var(--color-cyan-bright);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--color-border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--color-silver-muted);
}

.footer-back-top {
  color: var(--color-cyan-bright);
  text-decoration: none;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: color 0.2s ease;
}

.footer-back-top:hover {
  color: var(--color-text-white);
}

/* --------------------------------------------------------------------------
   Animations (Subtle & Restrained)
   -------------------------------------------------------------------------- */
@keyframes pulse-node {
  0%, 100% {
    transform: scale(1);
    opacity: 0.8;
  }
  50% {
    transform: scale(1.3);
    opacity: 1;
    box-shadow: 0 0 12px var(--color-cyan-bright);
  }
}

@keyframes orbit-harmonic {
  from {
    stroke-dashoffset: 0;
  }
  to {
    stroke-dashoffset: 360;
  }
}

.anim-orbit {
  stroke-dasharray: 8 6;
  animation: orbit-harmonic 35s linear infinite;
}

/* --------------------------------------------------------------------------
   Responsive Media Queries
   Solid behavior for 390px, tablets, and 1440px
   -------------------------------------------------------------------------- */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.75rem;
  }

  /* Content BEFORE illustration on mobile/narrow viewports */
  .hero-content {
    order: 1;
  }

  .hero-visual {
    order: 2;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .mobile-nav-toggle {
    display: inline-flex;
  }

  /* Closed mobile nav is display: none so it DOES NOT inflate viewport width
     and cannot receive keyboard focus */
  .primary-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background: rgba(4, 7, 14, 0.98);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-top: 1px solid var(--color-border-subtle);
    padding: 2rem 1.5rem;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 1.5rem;
    overflow-y: auto;
    z-index: 999;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 0.5rem;
  }

  .nav-link {
    font-size: 1.1rem;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    width: 100%;
    border-bottom: 1px solid rgba(148, 163, 184, 0.08);
  }

  .hero-cta-group {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .visual-canvas-card {
    max-width: 100%;
  }
}

/* Targeted 390px Viewport (Mobile standard: iPhone 12/13/14/15/16) */
@media (max-width: 420px) {
  :root {
    --container-padding: 1rem;
  }

  .brand-title {
    font-size: 1.2rem;
    letter-spacing: 0.08em;
  }

  .brand-subtitle-mini {
    font-size: 0.58rem;
    letter-spacing: 0.05em;
  }

  .hero-brand {
    font-size: 2.6rem;
  }

  .hero-subtitle-exact {
    font-size: 1.1rem;
    line-height: 1.3;
  }

  .hero-description {
    font-size: 0.95rem;
  }

  .provisional-grid,
  .about-grid,
  .research-grid {
    grid-template-columns: 1fr;
  }

  .research-card {
    padding: 1.5rem 1.25rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
}

/* Targeted 1440px Viewport (Desktop standard) */
@media (min-width: 1400px) {
  :root {
    --container-max: 1240px;
  }

  .hero-brand {
    font-size: 5rem;
  }

  .hero-subtitle-exact {
    font-size: 1.95rem;
  }
}

/* Reduced Motion Preference (Vestibular Accessibility) */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ARMOS block 05: Meta prototype adapted to existing vanilla stack, no dependencies */
.lab-block{grid-column:1/-1;display:block;padding:clamp(1rem,3vw,2.5rem);background:linear-gradient(135deg,#0b1220,#121a2b);color:#e8f3ff;border:1px solid #294051;border-radius:18px;scroll-margin-top:6rem}
.lab-block .lab-header{display:flex;justify-content:space-between;gap:1rem;align-items:start;flex-wrap:wrap}
.lab-block h2{color:#f5f7fb;font-size:clamp(1.5rem,3vw,2.5rem);margin:.6rem 0}
.lab-block p{color:#c7d5e1;max-width:65ch}
.lab-kicker{color:#22d3ee;text-transform:uppercase;font-size:.76rem;letter-spacing:.15em}
.lab-lang,.lab-filters{display:flex;gap:.5rem;flex-wrap:wrap}
.lab-filters{margin:1.4rem 0 .8rem}
.lab-block button{background:#17293d;color:#d3e6f7;border:1px solid #38526a;border-radius:18px;padding:.55rem .9rem;cursor:pointer}
.lab-block button:hover,.lab-block button:focus-visible{outline:2px solid #22d3ee;outline-offset:2px}
.lab-block button[aria-pressed="true"]{background:#22d3ee;color:#041522;border-color:#22d3ee;font-weight:700}
.lab-count{font-size:.9rem}
.lab-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));gap:1rem}
.lab-card{padding:1.2rem;background:#142337;border:1px solid #2b445b;border-radius:14px;min-width:0}
.lab-card h3{color:#f3f8fb;font-size:1.15rem;margin:.8rem 0}
.lab-card p{font-size:.92rem;line-height:1.55}
.lab-status{display:inline-block;color:#22d3ee;border:1px solid #2e6674;border-radius:1rem;padding:.25rem .6rem;font-size:.78rem}
.lab-disclaimer{margin:1.25rem 0 0;font-size:.83rem}
@media(max-width:420px){.lab-block{padding:1rem}.lab-grid{grid-template-columns:1fr}.lab-block button{padding:.55rem .7rem}}