/* ==========================================================================
   corebuffer.com — site styles
   Built on the shared Corebuffer design system (assets/design-system/, vendored
   from corebuffer/ui-design-system; never edit those files by hand).
   Every page links fonts.css and tokens.css before this file, so every
   colour, radius, shadow, font and duration below is a design-system token.
   Light by default; dark follows the OS, and data-theme on <html> overrides.
   ========================================================================== */

:root {
  /* Layout only: the site's own measurements, not a palette. */
  --max-width: 1240px;
  --header-height: 72px;
}

/* Per-discipline hue. K N W L D G each colour their own letter, bar and tag. */
[data-discipline="bare-metal"] { --d: var(--primary-ink);   --d-container: var(--primary-container);      --on-d-container: var(--on-primary-container); }
[data-discipline="fabric"] { --d: var(--tertiary);      --d-container: var(--tertiary-container);     --on-d-container: var(--on-tertiary-container); }
[data-discipline="ubiquitous"] { --d: var(--accent-blue);   --d-container: var(--accent-blue-container);  --on-d-container: var(--on-accent-blue-container); }
[data-discipline="real-time"] { --d: var(--warning);       --d-container: var(--warning-container);      --on-d-container: var(--on-warning-container); }
[data-discipline="fault-tolerant"] { --d: var(--accent-purple); --d-container: var(--accent-purple-container);--on-d-container: var(--on-accent-purple-container); }
[data-discipline="edge"] { --d: var(--secondary);     --d-container: var(--secondary-container);    --on-d-container: var(--on-secondary-container); }

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--on-bg);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-color: var(--bg);
  -webkit-overflow-scrolling: touch;
}

a { color: var(--link); }

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--r-xs);
}

/* Background Network Mesh / Subtle Canvas */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
  opacity: 0.35;
  transform: translateZ(0);
  will-change: transform;
}

/* Vignette Gradient */
.bg-vignette {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at 50% 15%, transparent 20%, var(--bg) 90%);
  pointer-events: none;
  z-index: -1;
  transform: translateZ(0);
  will-change: transform;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--sp-24);
}

/* Typography */
h1, h2, h3, h4 {
  font-weight: 650;
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--on-surface);
}

h1 {
  font-size: clamp(2.4rem, 5vw, 4.2rem);
  font-weight: 600;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  margin-bottom: var(--sp-16);
}

h3 {
  font-size: 1.35rem;
  letter-spacing: -0.01em;
  margin-bottom: var(--sp-8);
}

p {
  color: var(--on-surface-variant);
  font-size: 1.05rem;
  line-height: 1.7;
}

code, pre, .mono {
  font-family: var(--font-mono);
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary-ink) 30%, var(--tertiary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-text-emerald {
  color: var(--primary-ink);
}

/* Buttons: 10px controls, sentence-case, weight 600, flat. */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-8);
  min-height: 44px;
  font: var(--t-label-l);
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  padding: 0 var(--sp-24);
  border-radius: var(--r-md);
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
  border: 1px solid transparent;
  white-space: nowrap;
}

/* Filled */
.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
}

.btn-primary:hover {
  background: color-mix(in srgb, var(--on-primary) calc(var(--sl-hover) * 100%), var(--primary));
}

/* Outlined */
.btn-secondary {
  background: transparent;
  color: var(--primary-ink);
  border-color: var(--outline);
}

.btn-secondary:hover {
  background: color-mix(in srgb, var(--primary) calc(var(--sl-hover) * 100%), transparent);
}

/* Tonal (tertiary) */
.btn-glow-cyan {
  background: var(--tertiary-container);
  color: var(--on-tertiary-container);
}

.btn-glow-cyan:hover {
  background: color-mix(in srgb, var(--on-tertiary-container) calc(var(--sl-hover) * 100%), var(--tertiary-container));
}

.btn:disabled {
  background: color-mix(in srgb, var(--on-surface) calc(var(--disabled-container) * 100%), transparent);
  color: color-mix(in srgb, var(--on-surface) calc(var(--disabled-content) * 100%), transparent);
  border-color: transparent;
  cursor: not-allowed;
}

.btn-sm {
  min-height: 36px;
  padding: 0 var(--sp-16);
  font-size: 0.875rem;
}

/* Status pills */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: var(--sp-4) var(--sp-12);
  border-radius: var(--r-full);
  font: var(--t-label-m);
  letter-spacing: 0.03em;
  background: var(--primary-container);
  color: var(--on-primary-container);
}

.badge-cyan {
  background: var(--tertiary-container);
  color: var(--on-tertiary-container);
}

.badge-amber {
  background: var(--warning-container);
  color: var(--on-warning-container);
}

.badge-pulse::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: var(--r-full);
  background-color: currentColor;
  animation: pulseDot 2s infinite ease-in-out;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.7); }
}

/* Header & Nav */
.header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  transform: translateZ(0);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--sp-12);
  text-decoration: none;
  color: var(--on-surface);
}

.brand-logo {
  width: 36px;
  height: 36px;
}

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

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  font-family: var(--font-mono);
  color: var(--on-surface);
}

.brand-sub {
  font: var(--t-label-s);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--primary-ink);
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  color: var(--on-surface-variant);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  transition: color var(--dur-fast) var(--ease);
}

.nav-link:hover, .nav-link.active {
  color: var(--primary-ink);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-12);
}

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--outline);
  color: var(--on-surface);
  min-width: 44px;
  min-height: 44px;
  border-radius: var(--r-md);
  cursor: pointer;
}

/* Hero Section */
.hero {
  padding: 80px 0 60px;
  position: relative;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--sp-48);
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: var(--sp-20);
}

.hero-pill-box {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.hero-title {
  max-width: 680px;
}

.hero-desc {
  max-width: 600px;
  font-size: 1.15rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-16);
  margin-top: 10px;
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: var(--sp-24);
  padding-top: var(--sp-16);
  border-top: 1px solid var(--border);
  font-size: 0.88rem;
  color: var(--muted);
  font-family: var(--font-mono);
}

.hero-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Hero Overview Console */
.hero-visual {
  position: relative;
}

.hero-overview-console {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: var(--sp-20);
  position: relative;
  overflow: hidden;
}

.hero-overview-console::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--tertiary), var(--accent-blue));
}

.console-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-12);
  border-bottom: 1px solid var(--border);
  padding-bottom: 14px;
}

.console-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--on-surface);
  letter-spacing: 0.05em;
}

.console-desc {
  font-size: 0.9rem;
  margin: 0;
}

.console-disciplines-flow {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
  margin: 10px 0;
}

.flow-node {
  background: var(--surface-c-low);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: var(--sp-12) 6px;
  text-align: center;
  transition: border-color var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.flow-node:hover {
  border-color: var(--d, var(--primary));
  background: var(--d-container, var(--primary-container));
}

.flow-letter {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--d, var(--on-surface));
}

.flow-label {
  font: var(--t-label-s);
  text-transform: uppercase;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.console-summary-box {
  background: var(--surface-c-low);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 14px;
  font-size: 0.88rem;
  color: var(--on-surface-variant);
  line-height: 1.6;
}

.console-summary-box strong {
  color: var(--on-surface);
  display: block;
  margin-bottom: var(--sp-4);
}

.console-summary-box a {
  color: var(--primary-ink);
  text-decoration: none;
  font-weight: 700;
}

/* Sections General */
.section {
  padding: 100px 0;
  position: relative;
}

.section-alt {
  background: var(--surface-c);
  border-top: 1px solid var(--border);
}

.section-alt.section-alt-closed {
  border-bottom: 1px solid var(--border);
}

.section-header {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1.15rem;
  color: var(--on-surface-variant);
}

/* ==========================================================================
   CORE OFFERINGS / DISCIPLINES GRID
   ========================================================================== */
.disciplines-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
  gap: var(--sp-24);
}

/* Cards: hairline outline, 14px corners, no shadow (they do not float). */
.discipline-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--sp-32);
  transition: border-color var(--dur-base) var(--ease);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.discipline-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--d);
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease);
}

.discipline-card:hover {
  border-color: var(--outline);
}

.discipline-card:hover::before {
  opacity: 1;
}

.discipline-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.discipline-letter-box {
  width: 52px;
  height: 52px;
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 800;
  background: var(--d-container);
  color: var(--on-d-container);
}

.discipline-scope {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: uppercase;
  font-weight: 600;
}

.discipline-name {
  font-size: 1.45rem;
  margin-bottom: var(--sp-12);
  color: var(--on-surface);
}

.discipline-definition {
  font-size: 0.98rem;
  line-height: 1.65;
  color: var(--on-surface-variant);
  margin-bottom: var(--sp-20);
  flex-grow: 1;
}

.discipline-primitives {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-8);
  padding-top: var(--sp-16);
  border-top: 1px solid var(--border);
}

.primitive-tag {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  background: var(--surface-variant);
  padding: 5px 10px;
  border-radius: var(--r-xs);
  color: var(--on-surface-variant);
  font-weight: 500;
}

/* ==========================================================================
   SPOTLIGHT TEASER: CORESEC VPN
   ========================================================================== */
.coresec-teaser-section {
  padding: 80px 0;
  position: relative;
}

.coresec-teaser-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--sp-48);
  position: relative;
  overflow: hidden;
  transition: border-color var(--dur-base) var(--ease);
}

.coresec-teaser-card:hover {
  border-color: var(--outline);
}

.coresec-teaser-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--sp-48);
  align-items: center;
}

.coresec-teaser-info {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.coresec-teaser-badge-row {
  display: flex;
  align-items: center;
  gap: var(--sp-12);
  flex-wrap: wrap;
}

.coresec-teaser-header {
  display: flex;
  align-items: center;
  gap: 18px;
}

.coresec-teaser-logo {
  width: 56px;
  height: 56px;
  border-radius: var(--r-lg);
}

.coresec-teaser-title {
  font-size: 2rem;
  font-weight: 650;
  letter-spacing: -0.015em;
  color: var(--on-surface);
}

.coresec-teaser-tagline {
  color: var(--primary-ink);
  font-size: 0.95rem;
  font-weight: 600;
  margin: 0;
}

.coresec-teaser-desc {
  font-size: 1.1rem;
  color: var(--on-surface-variant);
  line-height: 1.65;
}

.coresec-teaser-highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  margin: var(--sp-8) 0;
}

.teaser-highlight-item {
  background: var(--surface-c-low);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: var(--sp-12) 14px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.teaser-highlight-icon {
  font-size: 1.1rem;
  line-height: 1.2;
}

.teaser-highlight-text {
  font-size: 0.88rem;
  color: var(--on-surface);
  font-weight: 500;
  line-height: 1.4;
}

.coresec-teaser-action-row {
  display: flex;
  align-items: center;
  gap: var(--sp-16);
  margin-top: var(--sp-8);
  flex-wrap: wrap;
}

.coresec-teaser-action-row > span {
  font-size: 0.88rem;
  color: var(--on-surface-variant);
}

/* Teaser Right Visual */
.coresec-teaser-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
}

/* A device preview floats above the card, so it gets a shadow. */
.teaser-device-preview {
  background: var(--surface-c-low);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: var(--sp-24);
  width: 100%;
  max-width: 320px;
  box-shadow: var(--elev-2);
  text-align: center;
}

.preview-state-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-8);
  margin-bottom: var(--sp-12);
  font: var(--t-label-l);
  color: var(--on-surface);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.preview-state-title {
  font-size: 1.6rem;
  font-weight: 650;
  color: var(--success);
  margin-bottom: var(--sp-4);
}

.preview-state-sub {
  font-size: 0.8rem;
  color: var(--on-surface-variant);
  font-family: var(--font-mono);
  margin-bottom: var(--sp-16);
}

/* Key/value readouts (teaser preview, 404 route table) */
.kv-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--on-surface);
  text-align: left;
}

.kv-row {
  display: flex;
  justify-content: space-between;
  gap: var(--sp-12);
}

.kv-row + .kv-row { margin-top: var(--sp-4); }
.kv-key { color: var(--muted); }
.kv-val { font-weight: 600; }
.kv-val.good { color: var(--success); }
.kv-val.warn { color: var(--warning); }

.preview-state-dot {
  width: 10px;
  height: 10px;
  border-radius: var(--r-full);
  background: var(--state-up);
  display: inline-block;
  margin-right: 6px;
}

/* Philosophy Section */
.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.philosophy-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 36px;
  display: flex;
  flex-direction: column;
  gap: var(--sp-16);
  transition: border-color var(--dur-base) var(--ease);
}

.philosophy-card:hover {
  border-color: var(--outline);
}

.philosophy-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary-ink);
}

.philosophy-title {
  font-size: 1.3rem;
  color: var(--on-surface);
}

.philosophy-text {
  font-size: 0.98rem;
  color: var(--on-surface-variant);
  line-height: 1.65;
}

/* Roadmap Grid */
.roadmap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--sp-24);
}

.roadmap-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--sp-24);
  transition: border-color var(--dur-fast) var(--ease);
  display: flex;
  flex-direction: column;
}

.roadmap-card.is-live { border-color: color-mix(in srgb, var(--success) 45%, var(--border)); }
.roadmap-card.is-soon { border-color: color-mix(in srgb, var(--warning) 40%, var(--border)); }

.roadmap-card:hover {
  border-color: var(--outline);
}

.roadmap-card .btn {
  margin-top: 14px;
  width: fit-content;
}

.roadmap-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--sp-12);
  margin-bottom: var(--sp-12);
}

.roadmap-card-header h4 {
  font-size: 1.12rem;
  color: var(--on-surface);
  line-height: 1.35;
  margin: 0;
}

.badge-success {
  background: var(--success-container);
  color: var(--on-success-container);
}

.roadmap-status {
  position: static;
  flex-shrink: 0;
  white-space: nowrap;
}

.roadmap-card p {
  font-size: 0.9rem;
  color: var(--on-surface-variant);
  line-height: 1.55;
  flex-grow: 1;
}

/* ==========================================================================
   CORESEC VPN SIMULATOR
   ========================================================================== */
.phone-mockup-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
}

/* The phone floats, so it is the one place with a deep shadow. */
.phone-mockup {
  width: 100%;
  max-width: 340px;
  height: 680px;
  background: var(--bg);
  border-radius: 44px;
  border: 10px solid var(--surface-c-highest);
  box-sizing: border-box;
  box-shadow: var(--elev-3);
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  user-select: none;
}

.phone-notch {
  width: 120px;
  height: 18px;
  background: var(--surface-c-highest);
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  border-bottom-left-radius: var(--r-md);
  border-bottom-right-radius: var(--r-md);
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
}

.camera-lens {
  width: 8px;
  height: 8px;
  border-radius: var(--r-full);
  background: var(--on-surface);
}

.sim-app-header {
  padding: 26px var(--sp-20) 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.sim-app-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.sim-logo-tiny {
  width: 26px;
  height: 26px;
  border-radius: 6px;
}

.sim-app-title {
  font: var(--t-title-s);
  font-size: 0.95rem;
  color: var(--on-surface);
}

.sim-config-btn {
  background: none;
  border: none;
  color: var(--primary-ink);
  font: var(--t-label-m);
  cursor: pointer;
}

.sim-screen-body {
  padding: var(--sp-20);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  justify-content: space-between;
}

.sim-hero-box {
  background: var(--surface);
  border-radius: var(--r-lg);
  padding: var(--sp-20);
  text-align: center;
  border: 1px solid var(--border);
  color: var(--on-surface);
  transition: background-color var(--dur-base) var(--ease), border-color var(--dur-base) var(--ease);
}

.sim-hero-box.connected {
  background: var(--success-container);
  border-color: transparent;
  color: var(--on-success-container);
}

.sim-hero-box.connecting {
  background: var(--tertiary-container);
  border-color: transparent;
  color: var(--on-tertiary-container);
}

.sim-state-badge {
  display: inline-block;
  font: var(--t-label-m);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: var(--sp-4);
}

.sim-state-text {
  font-size: 1.5rem;
  font-weight: 650;
  color: var(--on-surface);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-8);
}

.sim-state-sub,
.sim-uptime {
  font-size: 0.8rem;
  color: var(--muted);
  font-family: var(--font-mono);
}

.sim-uptime { margin-top: var(--sp-8); font-size: 0.75rem; }
.sim-uptime strong { color: inherit; }

/* Inside a tinted state box every line takes the box's on-container colour. */
.sim-hero-box.connected :is(.sim-state-badge, .sim-state-text, .sim-state-sub, .sim-uptime),
.sim-hero-box.connecting :is(.sim-state-badge, .sim-state-text, .sim-state-sub, .sim-uptime) {
  color: inherit;
}

.sim-action-btn {
  width: 100%;
  min-height: var(--target-min);
  padding: 14px;
  border-radius: var(--r-md);
  font: var(--t-label-l);
  font-size: 1.05rem;
  border: none;
  cursor: pointer;
  transition: background-color var(--dur-fast) var(--ease);
  background: var(--primary);
  color: var(--on-primary);
  margin: var(--sp-12) 0;
}

.sim-action-btn:hover {
  background: color-mix(in srgb, var(--on-primary) calc(var(--sl-hover) * 100%), var(--primary));
}

.sim-action-btn.btn-disconnect {
  background: var(--primary-container);
  color: var(--on-primary-container);
}

.sim-action-btn.btn-disconnect:hover {
  background: color-mix(in srgb, var(--on-primary-container) calc(var(--sl-hover) * 100%), var(--primary-container));
}

.sim-counters-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: var(--sp-8);
  font-family: var(--font-mono);
}

.sim-counters-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-8);
}

.sim-counter-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: var(--sp-8) var(--sp-12);
}

.sim-counter-label {
  font-size: 0.68rem;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 2px;
}

.sim-counter-val {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--on-surface);
  font-family: var(--font-mono);
}

.sim-counter-val.good { color: var(--success); }

.pulse-ring {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: var(--r-full);
  background: currentColor;
  animation: pulseDot 1.6s infinite;
}

.sim-connecting-spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid color-mix(in srgb, currentColor 25%, transparent);
  border-top-color: currentColor;
  border-radius: var(--r-full);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Snackbar: inverse surface, floats. */
.sim-toast {
  position: absolute;
  top: 60px;
  left: var(--sp-20);
  right: var(--sp-20);
  background: var(--inverse-surface);
  color: var(--inverse-on-surface);
  font-size: 0.74rem;
  line-height: 1.4;
  padding: 10px var(--sp-12);
  border-radius: var(--r-sm);
  z-index: 20;
  box-shadow: var(--elev-3);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity var(--dur-base) var(--ease), transform var(--dur-base) var(--ease);
  font-family: var(--font-mono);
}

.sim-toast.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.sim-config-modal {
  position: absolute;
  inset: 0;
  background: var(--surface);
  z-index: 30;
  display: flex;
  flex-direction: column;
  padding: var(--sp-24) var(--sp-20);
  transform: translateY(100%);
  transition: transform var(--dur-slow) var(--ease-emph);
  overflow-y: auto;
}

.sim-config-modal.active {
  transform: translateY(0);
}

.sim-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-16);
  padding-bottom: var(--sp-12);
  border-bottom: 1px solid var(--border);
}

.sim-modal-title {
  font: var(--t-title-s);
  font-size: 0.95rem;
  color: var(--on-surface);
}

.sim-modal-note {
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: var(--sp-12);
}

.sim-close-btn {
  background: var(--surface-c-high);
  border: 1px solid var(--border);
  color: var(--on-surface);
  font: var(--t-label-m);
  padding: var(--sp-4) 10px;
  border-radius: var(--r-sm);
  cursor: pointer;
}

.sim-config-code {
  background: var(--surface-c-low);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.55;
  color: var(--primary-ink);
  white-space: pre-wrap;
  word-break: break-all;
}

.sim-roaming-hint {
  font-size: 0.7rem;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--primary);
  border-radius: var(--r-xs);
  padding: var(--sp-8) 10px;
  margin-top: 10px;
  line-height: 1.4;
}

/* Architecture Card in coresec.html */
.arch-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--sp-32);
}

/* The data-plane diagram is drawn in the light palette, so it keeps a white
   plate in both themes, the way a photo would. */
.arch-img-wrapper {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--r-md);
  margin-bottom: var(--sp-24);
  border: 1px solid var(--border);
  background: #FFFFFF;
}

.arch-img-wrapper img {
  width: 100%;
  height: auto;
  display: block;
}

.mobile-scroll-hint {
  display: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--on-primary-container);
  font-weight: 600;
  text-align: center;
  margin-bottom: var(--sp-12);
  background: var(--primary-container);
  border-radius: var(--r-sm);
  padding: 6px var(--sp-12);
}

.coresec-metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-16);
  border-top: 1px solid var(--border);
  padding-top: var(--sp-20);
}

/* Footer */
.footer {
  background: var(--surface-c);
  border-top: 1px solid var(--border);
  padding: 80px 0 40px;
  color: var(--on-surface-variant);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr;
  gap: var(--sp-48);
  margin-bottom: 60px;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: var(--sp-16);
}

.footer-tagline {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--primary-ink);
  font-weight: 600;
}

.footer-col h5 {
  color: var(--on-surface);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--sp-20);
  font-family: var(--font-mono);
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--sp-12);
}

.footer-col a {
  color: var(--on-surface-variant);
  text-decoration: none;
  font-size: 0.92rem;
  transition: color var(--dur-fast) var(--ease);
}

.footer-col a:hover {
  color: var(--primary-ink);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--sp-32);
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}

.footer-bottom a {
  color: var(--on-surface-variant);
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 992px) {
  .coresec-teaser-layout {
    grid-template-columns: 1fr;
    gap: var(--sp-32);
  }
  .coresec-product-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .console-disciplines-flow {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  /* Disable heavy background canvas animation on mobile for 60fps smooth scrolling */
  #bg-canvas {
    display: none !important;
  }

  /* Header & Navigation Drawer */
  .header-actions .btn {
    display: none;
  }

  /* The drawer floats over the page. */
  .nav {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--surface);
    padding: var(--sp-24);
    gap: 18px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--elev-2);
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
  }

  .nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav-link {
    font-size: 1.05rem;
    padding: 6px 0;
  }

  .mobile-menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  /* Spacing & Layout */
  .hero {
    padding: var(--sp-48) 0 var(--sp-24);
  }

  .section {
    padding: 60px 0;
  }

  .hero-overview-console {
    padding: var(--sp-20) var(--sp-16);
  }

  .hero-meta {
    flex-wrap: wrap;
    gap: 10px 18px;
  }

  .disciplines-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-16);
  }

  .discipline-card {
    padding: var(--sp-24) 18px;
  }

  .coresec-teaser-card {
    padding: 28px 18px;
  }

  .philosophy-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-16);
  }

  .philosophy-card {
    padding: var(--sp-24) 18px;
  }

  .roadmap-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-16);
  }

  .roadmap-card {
    padding: 22px 18px;
  }

  .feature-cards-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-16);
  }

  .arch-card {
    padding: var(--sp-20) 14px;
  }

  .arch-img-wrapper img {
    min-width: 680px;
  }

  .mobile-scroll-hint {
    display: block;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--sp-16);
    text-align: center;
  }
}

@media (max-width: 520px) {
  .coresec-metrics-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sp-12);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--layout-gutter);
  }

  h1 {
    font-size: 2.1rem;
    line-height: 1.2;
    overflow-wrap: break-word;
    word-break: break-word;
  }

  h2 {
    font-size: 1.65rem;
    line-height: 1.25;
  }

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

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

  .coresec-teaser-action-row {
    flex-direction: column;
    align-items: stretch;
  }

  .coresec-teaser-action-row .btn {
    width: 100%;
    justify-content: center;
  }

  .console-disciplines-flow {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sp-8);
  }

  .flow-node {
    padding: 10px var(--sp-4);
  }

  .flow-letter {
    font-size: 1.2rem;
  }

  .flow-label {
    font-size: 0.62rem;
  }

  .coresec-teaser-card {
    padding: var(--sp-20) 14px;
  }

  .teaser-device-preview {
    max-width: 100%;
    padding: 18px var(--sp-12);
  }

  .phone-mockup {
    max-width: 310px;
    height: 600px;
    border-width: 6px;
    border-radius: 34px;
  }

  .phone-notch {
    width: 96px;
    height: 14px;
  }

  .sim-screen-body {
    padding: 14px var(--sp-12);
    gap: var(--sp-12);
  }

  .sim-action-btn {
    padding: 13px 18px;
    font-size: 0.98rem;
  }

  .platform-install-card {
    padding: var(--sp-20) var(--sp-16);
  }

  .brand-name {
    font-size: 1.15rem;
  }
}

@media (max-width: 360px) {
  .coresec-metrics-grid {
    grid-template-columns: 1fr;
  }
}