/* ==========================================================================
   echteler.org – Personal Homepage
   Design System: Dark mode, minimalist, tech-aesthetic
   ========================================================================== */

/* --------------------------------------------------------------------------
   Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Colors */
  --color-bg:          #0a0a0f;
  --color-surface:     #111118;
  --color-border:      #1e1e2e;
  --color-accent:      #6c63ff;
  --color-accent-teal: #00d4aa;
  --color-text:        #e8e8f0;
  --color-muted:       #6b6b7b;
  --color-code:        #a8ff78;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Font sizes (fluid) */
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;
  --text-6xl:  3.75rem;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --max-width:    1100px;
  --nav-height:   64px;
  --radius-sm:    4px;
  --radius:       8px;
  --radius-lg:    12px;

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-base:   200ms ease;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

img, svg {
  display: block;
  max-width: 100%;
}

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

ul {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* --------------------------------------------------------------------------
   Skip Link (accessibility)
   -------------------------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-accent);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius);
  font-weight: 600;
  z-index: 9999;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-4);
}

/* --------------------------------------------------------------------------
   Typography Utilities
   -------------------------------------------------------------------------- */
.mono {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

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

/* --------------------------------------------------------------------------
   Layout: Container
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 300;
  height: var(--nav-height);
}

.site-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: -1;
}

.nav {
  height: 100%;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.nav__logo {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.05em;
  transition: opacity var(--transition-fast);
}

.nav__logo:hover {
  opacity: 0.8;
}

.nav__logo-img {
  display: block;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
}

.nav__menu {
  display: flex;
  gap: var(--space-8);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-muted);
  letter-spacing: 0.02em;
  transition: color var(--transition-base);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

.nav__link:hover,
.nav__link:focus-visible,
.nav__link.is-active {
  color: var(--color-text);
}

.nav__link.is-active::after,
.nav__link:hover::after {
  width: 100%;
}

.nav__link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

/* Hamburger toggle – hidden on desktop */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
}

.nav__toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.nav__toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* --------------------------------------------------------------------------
   Navigation – Mobile
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .nav__toggle {
    display: flex;
  }

  .nav__menu {
    position: fixed;
    inset: 0;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-6);
    background: rgba(10, 10, 15, 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 200;
    pointer-events: none;
    transform: translateY(-100%);
    transition: transform 300ms ease;
    overflow-y: auto;
    padding-block: var(--space-10);
  }

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

  /* Stagger individual menu items */
  .nav__menu > li {
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 250ms ease, transform 250ms ease;
  }

  .nav__menu > li.is-visible {
    opacity: 1;
    transform: translateY(0);
  }

  .nav__link {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
  }

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

  .nav__link.is-active {
    color: var(--color-accent);
  }

  /* Hamburger → X animation */
  .nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) {
    opacity: 0;
  }

  .nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}

/* --------------------------------------------------------------------------
   Scroll Fade-in Animation
   -------------------------------------------------------------------------- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 500ms ease, transform 500ms ease;
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: calc(100vh - var(--nav-height));
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-block: var(--space-24);
}

/* CSS dot grid background */
.hero__bg {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, #1e1e2e 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.5;
  pointer-events: none;
}

/* Radial gradient overlay on top of dot grid */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 50%, rgba(108, 99, 255, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-16);
  align-items: center;
}

.hero__text {
  min-width: 0;
}

.hero__visual {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.hero__logo {
  width: 260px;
  height: 260px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--color-border);
  filter: drop-shadow(0 0 40px rgba(108, 99, 255, 0.2));
}

.hero__label {
  color: var(--color-accent);
  margin-bottom: var(--space-4);
  display: block;
}

.hero__name {
  font-size: clamp(var(--text-4xl), 8vw, var(--text-6xl));
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: var(--space-4);
  background: linear-gradient(135deg, var(--color-text) 0%, rgba(232, 232, 240, 0.7) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__tagline {
  font-size: clamp(var(--text-lg), 3vw, var(--text-2xl));
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: var(--space-6);
  letter-spacing: 0.01em;
}

.hero__pitch {
  font-size: var(--text-lg);
  color: var(--color-muted);
  line-height: 1.8;
  max-width: 560px;
  margin-bottom: var(--space-10);
}

.hero__cta {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-12);
}

.hero__social {
  display: flex;
  gap: var(--space-5);
  align-items: center;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: all var(--transition-base);
  cursor: pointer;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
  border: 1px solid var(--color-accent);
}

.btn--primary:hover {
  background: transparent;
  color: var(--color-accent);
}

.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

/* --------------------------------------------------------------------------
   Social Links
   -------------------------------------------------------------------------- */
.social-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-muted);
  transition: color var(--transition-base), transform var(--transition-fast);
}

.social-link:hover {
  color: var(--color-accent);
  transform: translateY(-2px);
}

.social-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------------------
   Section Shared Styles
   -------------------------------------------------------------------------- */
.section {
  padding-block: var(--space-24);
  border-top: 1px solid var(--color-border);
}

.section__label {
  color: var(--color-accent-teal);
  font-size: var(--text-sm);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-3);
  display: block;
}

.section__title {
  font-size: clamp(var(--text-2xl), 4vw, var(--text-4xl));
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: var(--space-6);
}

.section__sub {
  font-size: var(--text-sm);
  color: var(--color-muted);
  margin-bottom: var(--space-12);
  display: block;
}

.section__footer {
  margin-top: var(--space-10);
  text-align: center;
}

/* --------------------------------------------------------------------------
   Tags / Chips
   -------------------------------------------------------------------------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: var(--text-sm);
  color: var(--color-muted);
  white-space: nowrap;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.tag--sm {
  font-size: var(--text-xs);
  padding: 2px var(--space-2);
}

/* --------------------------------------------------------------------------
   About Section
   -------------------------------------------------------------------------- */
.about__grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-12);
  align-items: start;
}

.about__photo {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-6));
}

.about__portrait {
  width: 100%;
  max-width: 280px;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-lg);
  object-fit: cover;
  object-position: center top;
  border: 1px solid var(--color-border);
  filter: grayscale(15%);
  transition: filter var(--transition-base);
}

.about__portrait:hover {
  filter: grayscale(0%);
}

.about__text p {
  color: var(--color-muted);
  line-height: 1.8;
  margin-bottom: var(--space-4);
}

.about__text p:first-child {
  font-size: var(--text-lg);
  color: var(--color-text);
  font-weight: 500;
}

.about__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-6);
}

.about__tags .tag {
  font-size: var(--text-sm);
}

/* --------------------------------------------------------------------------
   Work / Timeline Section
   -------------------------------------------------------------------------- */
.timeline {
  position: relative;
  padding-left: var(--space-8);
  margin-bottom: var(--space-16);
}

/* Vertical line */
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: var(--space-3);
  bottom: var(--space-3);
  width: 1px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-border));
}

.timeline__item {
  position: relative;
  margin-bottom: var(--space-10);
}

.timeline__item:last-child {
  margin-bottom: 0;
}

/* Dot on the timeline */
.timeline__marker {
  position: absolute;
  left: calc(-1 * var(--space-8) - 5px);
  top: var(--space-5);
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid var(--color-bg);
  box-shadow: 0 0 0 1px var(--color-accent);
}

.timeline__card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: border-color var(--transition-base);
}

.timeline__card:hover {
  border-color: rgba(108, 99, 255, 0.4);
}

.timeline__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.timeline__role {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-1);
}

.timeline__company {
  font-size: var(--text-sm);
  color: var(--color-accent);
  font-weight: 500;
}

.timeline__meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-1);
  flex-shrink: 0;
}

.timeline__tenure {
  color: var(--color-muted);
  font-size: var(--text-xs);
  white-space: nowrap;
}

.timeline__location {
  color: var(--color-muted);
  font-size: var(--text-xs);
  opacity: 0.7;
}

.timeline__summary {
  color: var(--color-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
  font-style: italic;
}

.timeline__bullets {
  list-style: none;
  margin-bottom: var(--space-5);
}

.timeline__bullets li {
  position: relative;
  padding-left: var(--space-5);
  color: var(--color-muted);
  font-size: var(--text-sm);
  line-height: 1.7;
  margin-bottom: var(--space-2);
}

.timeline__bullets li:last-child {
  margin-bottom: 0;
}

.timeline__bullets li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-accent-teal);
  font-family: var(--font-mono);
}

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

/* Terminal callout card */
.terminal-card {
  background: rgba(108, 99, 255, 0.05);
  border: 1px solid rgba(108, 99, 255, 0.3);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.terminal-card__text {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-muted);
  line-height: 1.8;
  flex: 1;
  min-width: 280px;
}

.terminal-card__text::before {
  content: '> ';
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   IoT / Homelab Section
   -------------------------------------------------------------------------- */
.section--iot {
  background: linear-gradient(180deg, var(--color-bg) 0%, rgba(17, 17, 24, 0.5) 100%);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.cards-grid--3col {
  grid-template-columns: repeat(3, 1fr);
  margin-bottom: var(--space-12);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.card__icon {
  color: var(--color-accent-teal);
  margin-bottom: var(--space-4);
}

.card__title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
}

.card__text {
  font-size: var(--text-sm);
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

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

/* --------------------------------------------------------------------------
   Outdoors Section
   -------------------------------------------------------------------------- */
.outdoors-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: start;
}

/* Left: climbing feature block */
.outdoors-feature {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  border-left: 3px solid var(--color-accent-teal);
}

.outdoors-feature__header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.outdoors-feature__icon {
  font-size: 2rem;
  line-height: 1;
}

.outdoors-feature__title {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.outdoors-feature__lead {
  font-size: var(--text-base);
  color: var(--color-text);
  font-weight: 500;
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

.outdoors-feature__body {
  font-size: var(--text-sm);
  color: var(--color-muted);
  line-height: 1.8;
  margin-bottom: var(--space-6);
}

.outdoors-stats {
  display: flex;
  gap: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.outdoors-stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.outdoors-stat__value {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-accent-teal);
  white-space: nowrap;
}

.outdoors-stat__label {
  font-size: var(--text-xs);
  color: var(--color-muted);
  white-space: nowrap;
}

/* Right: travel cards stacked */
.outdoors-travel {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.travel-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: border-color var(--transition-base);
}

.travel-card:hover {
  border-color: var(--color-accent-teal);
}

.travel-card__accent {
  font-size: 1.75rem;
  line-height: 1;
  margin-bottom: var(--space-3);
}

.travel-card__title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
  letter-spacing: -0.01em;
}

.travel-card__text {
  font-size: var(--text-sm);
  color: var(--color-muted);
  line-height: 1.7;
}

/* SVG world map */
.world-map {
  width: 100%;
  max-width: 800px;
  margin-inline: auto;
  opacity: 0.4;
}

.world-map__svg {
  width: 100%;
  height: auto;
}

.map-land {
  fill: var(--color-border);
  stroke: var(--color-surface);
  stroke-width: 1;
}

.map-dot--primary {
  fill: var(--color-accent);
  filter: drop-shadow(0 0 6px var(--color-accent));
}

.map-dot--secondary {
  fill: var(--color-accent-teal);
  filter: drop-shadow(0 0 6px var(--color-accent-teal));
}

.map-label {
  fill: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

/* --------------------------------------------------------------------------
   Tools / Infrastructure Topology Section
   -------------------------------------------------------------------------- */
.section--tools {
  opacity: 0.92;
}

.tools__note {
  margin-bottom: var(--space-10);
  display: block;
}

/* Topology diagram */
.topo {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.topo__row {
  display: flex;
  justify-content: center;
}

/* Base node style */
.topo__node {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-muted);
  transition: border-color var(--transition-base);
}

/* Internet entry node */
.topo__node--internet {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-muted);
  border-style: dashed;
  padding: var(--space-2) var(--space-4);
}

/* Gateway node */
.topo__node--gateway {
  text-decoration: none;
  border-color: var(--color-accent);
  background: rgba(108, 99, 255, 0.06);
  padding: var(--space-4) var(--space-6);
  gap: var(--space-4);
  min-width: 300px;
  justify-content: center;
}

.topo__node--gateway svg {
  color: var(--color-accent);
  flex-shrink: 0;
}

.topo__node-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.topo__node-name {
  font-weight: 600;
  color: var(--color-text);
  font-size: var(--text-sm);
}

.topo__node-url {
  font-size: var(--text-xs);
  color: var(--color-muted);
}

/* Vertical connector between Internet and Gateway */
.topo__connector {
  width: 1px;
  height: 32px;
  background: var(--color-border);
}

/* Branch bar: horizontal line + vertical drops */
.topo__branch-bar {
  width: 100%;
  display: flex;
  justify-content: center;
  height: 32px;
  position: relative;
}

.topo__branch-line {
  position: absolute;
  top: 0;
  left: calc(100% / 6);
  right: calc(100% / 6);
  height: 1px;
  background: var(--color-border);
}

/* Service groups row */
.topo__groups {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  width: 100%;
}

.topo__group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  align-items: stretch;
  position: relative;
  padding-top: var(--space-8);
}

/* Vertical drop line from branch bar to group */
.topo__group::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 1px;
  height: var(--space-8);
  background: var(--color-border);
}

.topo__group-label {
  font-size: var(--text-xs);
  color: var(--color-accent-teal);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: var(--space-1);
  text-align: center;
}

/* Individual service pill inside a group */
.topo__service {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-muted);
  text-decoration: none;
  transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
}

.topo__service svg {
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Contact Section
   -------------------------------------------------------------------------- */
.section--contact {
  text-align: center;
  background: linear-gradient(180deg, var(--color-bg) 0%, rgba(17, 17, 24, 0.8) 100%);
}

.contact__heading {
  font-size: clamp(var(--text-4xl), 6vw, 4.5rem);
}

.contact__sub {
  color: var(--color-muted);
  font-size: var(--text-lg);
  max-width: 500px;
  margin-inline: auto;
  margin-bottom: var(--space-10);
}

.contact__email {
  margin-bottom: var(--space-10);
  font-family: var(--font-mono);
}

.contact__social {
  display: flex;
  gap: var(--space-6);
  justify-content: center;
  flex-wrap: wrap;
}

.contact__social .social-link {
  font-size: var(--text-sm);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   Links
   -------------------------------------------------------------------------- */
.link {
  color: var(--color-accent);
  font-weight: 500;
  transition: opacity var(--transition-fast);
}

.link:hover {
  opacity: 0.8;
}

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

/* --------------------------------------------------------------------------
   Site Footer
   -------------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8);
}

.site-footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.site-footer__copy {
  font-size: var(--text-sm);
}

.site-footer__links {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
}

.site-footer__link {
  color: var(--color-muted);
  transition: color var(--transition-fast);
}

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

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

.site-footer__sep {
  color: var(--color-border);
}

/* --------------------------------------------------------------------------
   Nav Overlay (mobile background)
   -------------------------------------------------------------------------- */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 15, 0.7);
  z-index: 250;
}

.nav-overlay.is-visible {
  display: block;
}

/* --------------------------------------------------------------------------
   Responsive Breakpoints
   -------------------------------------------------------------------------- */

/* Tablet */
@media (max-width: 900px) {
  .about__grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .about__photo {
    position: static;
  }

  .about__portrait {
    max-width: 200px;
    border-radius: var(--radius-lg);
  }

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

  .cards-grid--3col {
    grid-template-columns: 1fr;
  }

  .topo__groups {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .topo__branch-line {
    display: none;
  }

  .topo__group::before {
    display: none;
  }

  .topo__group {
    padding-top: 0;
  }

  .topo__node--gateway {
    min-width: 0;
    width: 100%;
  }

  .timeline {
    padding-left: var(--space-6);
  }
}

/* Mobile */
@media (max-width: 640px) {
  .container {
    padding-inline: var(--space-5);
  }

  .section {
    padding-block: var(--space-16);
  }

  .hero {
    padding-block: var(--space-16);
    min-height: auto;
  }

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

  .hero__visual {
    order: -1;
  }

  .hero__logo {
    width: 160px;
    height: 160px;
  }

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

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

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

  .timeline__header {
    flex-direction: column;
    gap: var(--space-2);
  }

  .timeline__meta {
    align-items: flex-start;
  }

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

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

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

/* --------------------------------------------------------------------------
   Print Styles
   -------------------------------------------------------------------------- */
/* ==========================================================================
   Consent Banner
   ========================================================================== */

.consent-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.4);
  padding: var(--space-6) var(--space-8);
}

.consent-banner[hidden] {
  display: none;
}

.consent-banner__inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.consent-banner__text {
  flex: 1;
}

.consent-banner__title {
  display: block;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.consent-banner__text p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.875rem;
  line-height: 1.5;
}

.consent-banner__actions {
  display: flex;
  gap: var(--space-3);
  flex-shrink: 0;
}

.site-footer__consent-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  padding: 0;
  color: var(--color-muted);
  transition: color 0.2s;
}

.site-footer__consent-btn:hover {
  color: var(--color-text);
}

@media (max-width: 640px) {
  .consent-banner__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
  }

  .consent-banner__actions {
    width: 100%;
  }

  .consent-banner__actions .btn {
    flex: 1;
    text-align: center;
  }
}

/* ==========================================================================
   Print
   ========================================================================== */

@media print {
  .site-header,
  .section--tools,
  .hero__cta,
  .hero__social,
  .nav-overlay {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .section {
    page-break-inside: avoid;
    border-top: 1px solid #ddd;
  }

  .timeline__card,
  .card {
    border: 1px solid #ddd;
  }

  a::after {
    content: " (" attr(href) ")";
    font-size: 0.75em;
    color: #666;
  }

  .nav__logo::after,
  .btn::after,
  .social-link::after {
    content: none;
  }
}