/* ==========================================================================
   buchsteiner | solutions — design tokens
   Farben hier anpassen — alles andere leitet sich daraus ab.
   ========================================================================== */

:root {
  --bg: #12151a;
  --bg-elev: #1a1f26;
  --bg-elev-2: #20262e;
  --text: #e9e7e2;
  --text-muted: #9299a1;
  --border: #262c34;
  --border-strong: #333b45;
  --accent: #f5c518;
  --accent-hot: #ffb020;
  --accent-glow: rgba(245, 197, 24, 0.32);
  --accent-text-on: #14161a;
  --ok: #57d38c;
  --danger: #e2504a;

  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;
  --font-sans: 'IBM Plex Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --radius: 3px;
  --wrap: 1180px;
  --wrap-narrow: 860px;
  color-scheme: dark;
}

[data-theme="light"] {
  --bg: #f3f4f6;
  --bg-elev: #f7f8fa;
  --bg-elev-2: #eceef1;
  --text: #14171a;
  --text-muted: #5a6068;
  --border: #dde0e4;
  --border-strong: #c7cbd1;
  --accent: #96720b;
  --accent-hot: #b38f00;
  --accent-glow: rgba(150, 114, 11, 0.14);
  --accent-text-on: #ffffff;
  --ok: #1e8a52;
  --danger: #b3352f;
  color-scheme: light;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f3f4f6;
    --bg-elev: #f7f8fa;
    --bg-elev-2: #eceef1;
    --text: #14171a;
    --text-muted: #5a6068;
    --border: #dde0e4;
    --border-strong: #c7cbd1;
    --accent: #96720b;
    --accent-hot: #b38f00;
    --accent-glow: rgba(150, 114, 11, 0.14);
    --accent-text-on: #ffffff;
    --ok: #1e8a52;
    --danger: #b3352f;
    color-scheme: light;
  }
}

/* ==========================================================================
   Reset & base
   ========================================================================== */

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color .25s ease, color .25s ease;
}

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 28px; }
.wrap-narrow { max-width: var(--wrap-narrow); margin: 0 auto; padding: 0 28px; }

a { color: inherit; text-decoration: none; }
h1, h2, h3 { font-family: var(--font-mono); font-weight: 600; letter-spacing: -0.01em; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); margin-bottom: 40px; }

.eyebrow {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}

.section { padding: 96px 0; border-top: 1px solid var(--border); }
.section-alt { background: var(--bg-elev); }

.muted-italic { color: var(--text-muted); font-style: italic; }

.noise-overlay {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.25;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 0%, transparent 70%);
}

.scroll-progress {
  position: fixed; left: 0; right: 0; bottom: 0; height: 3px;
  background: var(--border);
  z-index: 60;
}
.scroll-progress-fill {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hot));
  box-shadow: 0 0 8px var(--accent-glow);
}

/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }

.logo { font-family: var(--font-mono); font-size: 1rem; letter-spacing: -0.01em; white-space: nowrap; }
.logo-pipe { color: var(--accent); margin: 0 1px; }

.main-nav { display: flex; gap: 32px; }
.main-nav a {
  font-size: 0.92rem; color: var(--text-muted);
  position: relative; padding: 4px 0;
  transition: color .18s ease;
}
.main-nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 0;
  background: var(--accent); transition: width .22s ease;
}
.main-nav a:hover { color: var(--text); }
.main-nav a:hover::after { width: 100%; }

.back-link {
  font-family: var(--font-mono); font-size: 0.88rem; color: var(--text-muted);
  transition: color .18s ease;
}
.back-link::before { content: "← "; }
.back-link:hover { color: var(--accent); }

.header-controls { display: flex; align-items: center; gap: 10px; }

.ctrl-btn {
  font-family: var(--font-mono);
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: var(--radius);
  height: 34px; min-width: 34px;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: border-color .18s ease, color .18s ease, box-shadow .18s ease, transform .12s ease;
}
.ctrl-btn:hover { border-color: var(--accent); color: var(--text); box-shadow: 0 0 0 3px var(--accent-glow); }
.ctrl-btn:active { transform: scale(0.94); }

#lang-toggle { padding: 0 10px; font-size: 0.8rem; gap: 3px; }
.lang-de, .lang-en { transition: color .18s ease, opacity .18s ease; opacity: 0.5; }
.lang-de.active, .lang-en.active { color: var(--accent); opacity: 1; }
.lang-sep { color: var(--border-strong); }

.theme-btn .icon { width: 17px; height: 17px; }
.theme-btn .icon-moon { display: none; }
[data-theme="light"] .theme-btn .icon-sun,
:root:not([data-theme="dark"]):not([data-theme="light"]) .theme-btn .icon-sun { display: block; }
[data-theme="dark"] .theme-btn .icon-sun { display: none; }
[data-theme="dark"] .theme-btn .icon-moon { display: block; }
[data-theme="light"] .theme-btn .icon-moon,
:root:not([data-theme="dark"]):not([data-theme="light"]) .theme-btn .icon-moon { display: none; }

.menu-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.menu-toggle span { width: 20px; height: 1.5px; background: var(--text); }

.mobile-nav { display: none; flex-direction: column; border-top: 1px solid var(--border); padding: 8px 28px 18px; }
.mobile-nav a { padding: 12px 0; font-size: 0.98rem; border-bottom: 1px solid var(--border); }
.mobile-nav a:hover { color: var(--accent); }

@media (max-width: 780px) {
  .main-nav { display: none; }
  .menu-toggle { display: flex; }
  .mobile-nav.open { display: flex; }
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero { padding: 84px 0 96px; position: relative; z-index: 1; }
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 56px; align-items: center; }

.cursor { color: var(--accent); animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

.hero h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); line-height: 1.12; margin-bottom: 22px; }
.hero-sub { font-size: 1.08rem; color: var(--text-muted); max-width: 46ch; margin-bottom: 34px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  font-family: var(--font-mono); font-size: 0.9rem;
  padding: 13px 22px; border-radius: var(--radius);
  display: inline-block; border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .2s ease, border-color .18s ease;
}
.btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent-hot)); color: var(--accent-text-on); font-weight: 600; }
.btn-primary:hover { box-shadow: 0 0 0 4px var(--accent-glow); transform: translateY(-2px); }
.btn-ghost { border-color: var(--border-strong); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

.term-window {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 6px;
  overflow: hidden;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.term-window:hover { border-color: var(--border-strong); box-shadow: 0 0 0 1px var(--accent-glow); }
.term-bar { display: flex; align-items: center; gap: 7px; padding: 11px 14px; background: var(--bg-elev-2); border-bottom: 1px solid var(--border); }
.term-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--border-strong); transition: background-color .18s ease, box-shadow .18s ease; }
.term-window:hover .term-dot-red { background: var(--danger); box-shadow: 0 0 6px var(--danger); }
.term-window:hover .term-dot-amber { background: var(--accent); box-shadow: 0 0 6px var(--accent-glow); }
.term-window:hover .term-dot-green { background: var(--ok); box-shadow: 0 0 6px var(--ok); }
.term-title { margin-left: 8px; font-family: var(--font-mono); font-size: 0.76rem; color: var(--text-muted); }
.term-body {
  padding: 20px 18px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  height: 240px;
  box-sizing: border-box;
  overflow: hidden;
  scroll-behavior: smooth;
  -webkit-mask-image: linear-gradient(to bottom, transparent 0, black 20px);
  mask-image: linear-gradient(to bottom, transparent 0, black 20px);
}
.term-body p {
  margin: 0 0 4px;
  color: var(--text-muted);
  white-space: pre;
  overflow: hidden;
  text-overflow: ellipsis;
  animation: term-line-in .15s ease;
}
@keyframes term-line-in { from { opacity: 0; } to { opacity: 1; } }
.term-prompt-k8s { color: var(--accent); margin-right: 6px; }
.term-prompt-linux { color: var(--ok); margin-right: 6px; }
.term-out { color: var(--text); padding-left: 16px; }
.term-out.tone-accent { color: var(--accent); }
.term-out.tone-ok { color: var(--ok); }
.term-out.tone-danger { color: var(--danger); }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Card grids — used by services, faq
   ========================================================================== */

.grid-tiles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}
.tile {
  background: var(--bg-elev);
  padding: 30px 26px;
  position: relative;
  transition: background-color .2s ease, transform .2s ease;
}
.tile::before {
  content: ""; position: absolute; inset: 0;
  border: 1px solid transparent; border-radius: inherit;
  transition: border-color .2s ease, box-shadow .2s ease;
  pointer-events: none;
}
.tile:hover { background: var(--bg-elev-2); transform: translateY(-3px); }
.tile:hover::before { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent-glow); }
.tile-tag {
  font-family: var(--font-mono); font-size: 0.76rem; color: var(--text-muted);
  opacity: 0; transform: translateY(4px);
  transition: opacity .2s ease, transform .2s ease, color .2s ease;
  margin-bottom: 8px;
}
.tile:hover .tile-tag { opacity: 1; transform: translateY(0); color: var(--accent); }
.tile h3 { font-size: 1.08rem; margin-bottom: 10px; }
.tile p { color: var(--text-muted); font-size: 0.94rem; }

.grid-open {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 40px;
}
.grid-open .tile-open { transition: transform .2s ease; }
.grid-open .tile-open:hover { transform: translateY(-3px); }
.tile-num { display: block; font-family: var(--font-mono); color: var(--accent); font-size: 0.85rem; margin-bottom: 14px; opacity: 0.75; }
.tile-open:hover .tile-num { opacity: 1; }
.tile-open h3 { font-size: 1.1rem; margin-bottom: 10px; }
.tile-open p { color: var(--text-muted); font-size: 0.94rem; }

/* ==========================================================================
   Skills rack
   ========================================================================== */

.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}
@media (max-width: 900px) {
  .skills-grid { grid-template-columns: 1fr; }
}

.rack {
  position: relative;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.rack-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-elev-2);
  border-bottom: 1px solid var(--border);
}
.rack-label { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.04em; color: var(--text-muted); }
.rack-online-leds { display: flex; gap: 5px; }
.rack-online-led {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--ok); box-shadow: 0 0 5px var(--ok);
  animation: rack-online-flicker 2.4s ease-in-out infinite;
}
.rack-online-led:nth-child(2) { animation-delay: .6s; animation-duration: 3.1s; }
@keyframes rack-online-flicker { 0%, 100% { opacity: 1; } 6% { opacity: .3; } 9% { opacity: 1; } 46% { opacity: 1; } 50% { opacity: .4; } 54% { opacity: 1; } }
@media (prefers-reduced-motion: reduce) {
  .rack-online-led { animation: none; }
}

.rack-units { position: relative; padding: 14px 14px 14px 28px; display: flex; flex-direction: column; gap: 8px; }
.rack-unit {
  position: relative; z-index: 1;
  display: flex; align-items: center; gap: 10px;
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 12px 14px;
  font-family: var(--font-mono); font-size: 0.82rem; color: var(--text);
  cursor: pointer; text-align: left;
  transition: border-color .18s ease, background-color .18s ease, transform .12s ease;
}
.rack-unit:hover { border-color: var(--border-strong); transform: translateX(2px); }
.rack-unit.is-active { border-color: var(--accent); background: var(--bg-elev-2); box-shadow: 0 0 0 1px var(--accent-glow); }

.rack-unit-dot {
  width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
  background: var(--ok); box-shadow: 0 0 5px var(--ok);
  animation: rack-led-blink 2s ease-in-out infinite;
}
.rack-unit.is-active .rack-unit-dot { background: var(--accent); box-shadow: 0 0 5px var(--accent-glow); }
.rack-unit-title { flex: 1; letter-spacing: 0.01em; }
.rack-unit-ports { display: flex; gap: 3px; }
.rack-port {
  width: 4px; height: 8px; border-radius: 1px;
  background: var(--ok); opacity: 0.3;
  animation: rack-vent-shimmer 2s ease-in-out infinite;
}
.rack-unit.is-active .rack-port { background: var(--accent); opacity: 0.7; }
@media (prefers-reduced-motion: reduce) {
  .rack-unit-dot, .rack-port { animation: none; }
}

@keyframes rack-led-blink { 0%, 100% { opacity: 1; } 50% { opacity: 0.25; } }
@keyframes rack-vent-shimmer { 0%, 100% { opacity: 0.25; } 50% { opacity: 0.7; } }

.rack-screw {
  position: absolute;
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--border-strong);
}
.rack-screw-top-left { top: 6px; left: 6px; }
.rack-screw-top-right { top: 6px; right: 6px; }
.rack-screw-bottom-left { bottom: 6px; left: 6px; }
.rack-screw-bottom-right { bottom: 6px; right: 6px; }

.rack-cable-bus {
  position: absolute; left: 14px; width: 2px;
  background: var(--danger); opacity: 0.55;
  pointer-events: none;
}
.rack-cable-branch {
  position: absolute; left: 14px; width: 14px; height: 2px;
  background: var(--danger); opacity: 0.55;
  pointer-events: none;
}

.rack-footer {
  display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap;
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg-elev-2);
  font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.03em; color: var(--text-muted);
}
.rack-temp-wrap { display: flex; align-items: center; gap: 6px; }
.rack-temp-bar {
  position: relative;
  width: 44px; height: 5px; border-radius: 3px;
  background: linear-gradient(90deg, var(--ok), var(--accent), var(--danger));
}
.rack-temp-marker {
  position: absolute; top: -2px;
  width: 3px; height: 9px; border-radius: 1px;
  background: var(--text);
  box-shadow: 0 0 3px rgba(0, 0, 0, .5);
  transform: translateX(-50%);
}

.rack-terminal {
  position: relative;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  min-height: 320px;
  overflow: hidden;
}

.datacenter-bg { position: absolute; inset: 0; }
.dc-led {
  position: absolute;
  width: 3px; height: 3px; border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 4px var(--ok);
  opacity: 0.15;
  animation: dc-blink 3s ease-in-out infinite;
}
.dc-led-accent { background: var(--accent); box-shadow: 0 0 4px var(--accent-glow); }
@keyframes dc-blink { 0%, 100% { opacity: 0.1; } 50% { opacity: 0.85; } }
@media (prefers-reduced-motion: reduce) {
  .dc-led { animation: none; opacity: 0.35; }
}

.rack-idle {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  padding: 24px; text-align: center;
}
.rack-idle p { font-family: var(--font-mono); font-size: 0.86rem; color: var(--text-muted); max-width: 32ch; }

.rack-term-window { display: none; height: 100%; flex-direction: column; }
.rack-terminal.is-active .rack-term-window { display: flex; }
.rack-term-body {
  flex: 1 1 auto;
  height: auto;
  overflow: visible;
  -webkit-mask-image: none;
  mask-image: none;
}
.rack-terminal.is-active .rack-idle,
.rack-terminal.is-active .datacenter-bg { display: none; }

.rack-term-status {
  margin-left: auto;
  display: flex; align-items: center; gap: 5px;
  font-family: var(--font-mono); font-size: 0.68rem; color: var(--ok);
}
.rack-term-status::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--ok); box-shadow: 0 0 5px var(--ok);
}

.rack-skill-line { margin-bottom: 8px; font-family: var(--font-mono); font-size: 0.84rem; color: var(--text); }
.rack-skill-check { color: var(--accent); margin-right: 8px; }
.rack-term-prompt { color: var(--accent); margin-right: 6px; }
.term-body p.rack-note-line { margin-top: 20px; font-size: 0.8rem; font-weight: 600; color: var(--text); }

/* ==========================================================================
   Contact CTA
   ========================================================================== */

.contact-cta p { color: var(--text-muted); font-size: 1.08rem; max-width: 52ch; margin-bottom: 28px; }

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer { border-top: 1px solid var(--border); background: var(--bg); position: relative; z-index: 1; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; padding: 28px; }
.footer-brand { font-family: var(--font-mono); color: var(--text-muted); font-size: 0.9rem; }
.footer-inner a { font-size: 0.88rem; color: var(--text-muted); border-bottom: 1px dotted var(--border-strong); }
.footer-inner a:hover { color: var(--accent); border-color: var(--accent); }
.footer-legal { display: flex; gap: 18px; }
.footer-legal-row { padding-top: 20px; }
.footer-bottom { padding: 20px 28px 32px; font-size: 0.8rem; color: var(--text-muted); }

/* ==========================================================================
   Impressum page
   ========================================================================== */

main.impressum-main { padding: 64px 0 96px; }
.impressum-heading { font-size: clamp(1.7rem, 3.4vw, 2.2rem); margin-bottom: 8px; }
.impressum-sub-eyebrow { margin: 8px 0 40px; }
.impressum-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 30px;
  margin-bottom: 36px;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--border);
}
.impressum-grid h3 { font-size: 0.82rem; color: var(--accent); font-family: var(--font-mono); margin-bottom: 10px; letter-spacing: 0.03em; }
.impressum-grid p { font-size: 0.94rem; color: var(--text-muted); line-height: 1.8; }
.impressum-disclaimer { margin-top: 32px; }
.impressum-disclaimer h3 { font-size: 0.82rem; color: var(--accent); font-family: var(--font-mono); margin-bottom: 10px; }
.impressum-disclaimer p { font-size: 0.92rem; color: var(--text-muted); max-width: 75ch; line-height: 1.8; }

/* ==========================================================================
   Scroll reveal & accessibility
   ========================================================================== */

.reveal { opacity: 0; transform: translateY(16px); transition: opacity .5s ease, transform .5s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }