/* ═══════════════════════════════════════════════════════════
   BREATHFLOW v1 — Base / Layout
   ═══════════════════════════════════════════════════════════ */

*, *::before, *::after { box-sizing: border-box; }

html {
  margin: 0; padding: 0; min-height: 100%;
  background: var(--bg-0);
  /* Muss hier stehen, nicht nur am body: Safari lässt das html-Element sonst
     auf den breitesten Inhalt wachsen, und die ganze Seite zieht sich in die
     Breite. clip kappt, ohne einen eigenen Scrollbereich aufzumachen. */
  overflow-x: clip;
}
@supports not (overflow: clip) { html { overflow-x: hidden; } }

/* Body bleibt transparent — sonst überdeckt er das Aurora-Canvas dahinter. */
body {
  margin: 0; padding: 0; min-height: 100%;
  background: transparent;
  font-family: var(--font);
  color: var(--t);
  font-size: var(--fs-md);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overflow-x: hidden;
  transition: color var(--t-mid) var(--ease);
}

body.no-scroll { overflow: hidden; }

button, input, select, textarea { font-family: inherit; color: inherit; }
button { cursor: pointer; border: none; background: none; padding: 0; }
a { color: inherit; }
img { max-width: 100%; }
canvas { display: block; }
[hidden] { display: none !important; }
.hidden { display: none !important; }

::selection { background: var(--accent); color: var(--accent-ct); }

/* Schlanke Scrollbars — die Standard-Balken zerschneiden die Glasflächen */
* { scrollbar-width: thin; scrollbar-color: var(--track) transparent; }
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--track); border-radius: var(--r-pill); border: 3px solid transparent; background-clip: content-box; }
::-webkit-scrollbar-thumb:hover { background: var(--t-faint); background-clip: content-box; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--r-xs);
}

/* ── Aurora Hintergrund ── */
#aurora {
  position: fixed; inset: 0;
  width: 100%; height: 100%;
  z-index: -1;
  pointer-events: none;
}
/* Vignette legt sich über die Aurora, damit Text überall trägt */
body::after {
  content: ''; position: fixed; inset: 0; z-index: -1;
  pointer-events: none;
  background: radial-gradient(120% 90% at 50% 0%, rgba(255,255,255,0.55) 0%, transparent 60%);
}
:root.dark body::after {
  background:
    linear-gradient(to bottom, rgba(4,7,15,0.30) 0%, rgba(4,7,15,0.55) 45%, rgba(4,7,15,0.78) 100%),
    radial-gradient(120% 85% at 50% 0%, transparent 20%, rgba(0,0,0,0.35) 100%);
}

/* ── Loader ──
   Eins zu eins der Ladebildschirm von Landing und Academy: derselbe Verlauf,
   dasselbe Logo, dieselbe 11-Sekunden-Atmung. Nur die dunkle Fassung ist neu —
   sonst blitzt beim dunklen Thema kurz eine weiße Fläche auf. */
.loader {
  position: fixed; inset: 0; z-index: 9999;
  display: flex; align-items: center; justify-content: center;
  background: #E3ECF6;
  background-image:
    radial-gradient(circle at 75% 20%, rgba(150, 236, 255, 0.28) 0%, transparent 50%),
    radial-gradient(circle at 15% 80%, rgba(101, 244, 187, 0.18) 0%, transparent 50%),
    radial-gradient(circle at 90% 80%, rgba(100, 180, 255, 0.15) 0%, transparent 40%),
    radial-gradient(circle at 50% 100%, #fff 0%, transparent 40%);
  opacity: 1; visibility: visible;
  transition: opacity 0.5s ease, visibility 0.5s;
  cursor: none;
}
:root.dark .loader {
  background: #05070f;
  background-image:
    radial-gradient(circle at 75% 20%, rgba(40, 128, 196, 0.22) 0%, transparent 50%),
    radial-gradient(circle at 15% 80%, rgba(24, 200, 210, 0.14) 0%, transparent 50%),
    radial-gradient(circle at 90% 80%, rgba(55, 32, 110, 0.18) 0%, transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(28, 70, 130, 0.30) 0%, transparent 40%);
}
html:has(.loader:not(.gone)),
html:has(.loader:not(.gone)) * { cursor: none !important; }

.loader.gone { opacity: 0 !important; visibility: hidden; }

.loader-logo {
  height: 64px; width: auto;
  animation: bfLogoBreath 11s ease-in-out infinite;
}
@media (min-width: 769px) { .loader-logo { height: 88px; } }

@keyframes bfLogoBreath {
  0%, 100% { opacity: 0.3;  transform: scale(0.9); }
  45.5%    { opacity: 0.95; transform: scale(1.1); }
}

@media (prefers-reduced-motion: reduce) {
  .loader-logo { animation: none; opacity: 0.95; }
}

/* ── Shell ── */
.shell {
  position: relative;
  max-width: var(--max-w);
  margin: 0 auto;
  min-height: 100dvh;
  padding-bottom: calc(var(--nav-h) + var(--nav-pad-b) + 12px);
}

/* ── Topbar ── */
.topbar {
  position: sticky; top: 0; z-index: 60;
  height: calc(var(--topbar-h) + var(--safe-t));
  padding: var(--safe-t) var(--sp-4) 0;
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--sp-3);
  /* Bleibt beim Scrollen transparent — eine Leiste, die plötzlich milchig wird,
     zieht die Aufmerksamkeit genau dahin, wo sie nicht hingehört. */
  background: transparent;
  border-bottom: none;
}

.brand { display: flex; align-items: center; text-decoration: none; flex-shrink: 0; }
.brand-logo { height: 26px; width: auto; }

.topbar-actions { display: flex; align-items: center; gap: var(--sp-1); }

.lang-select {
  appearance: none; background: transparent; border: 1px solid var(--glass-bd);
  border-radius: var(--r-pill); padding: 4px 8px;
  font-size: var(--fs-xs); font-weight: 700; letter-spacing: 0.04em;
  color: var(--t-soft); cursor: pointer;
}

/* ── Nav (Tabbar mobil / Rail desktop) ── */
.nav {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 70;
  height: calc(var(--nav-h) + var(--nav-pad-b));
  padding-bottom: var(--nav-pad-b);
  display: flex; align-items: stretch; justify-content: space-around;
  background: var(--glass);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-top: 1px solid var(--glass-bd);
}
.nav-btn {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 3px; color: var(--t-faint);
  font-size: 0.66rem; font-weight: 600; letter-spacing: 0.02em;
  transition: color var(--t-fast), transform var(--t-fast);
  position: relative;
}
.nav-btn svg { width: 21px; height: 21px; }
.nav-btn:hover { color: var(--t-soft); }
.nav-btn.active { color: var(--accent); }
.nav-btn.active svg { filter: drop-shadow(0 0 8px color-mix(in srgb, var(--accent) 55%, transparent)); }
.nav-btn.active::before {
  content: ''; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: 26px; height: 2.5px; border-radius: 0 0 3px 3px; background: var(--accent);
}
.nav-btn:active { transform: scale(0.94); }

/* ── Stage / Views ── */
.stage { padding: var(--sp-4) var(--sp-4) 0; overflow-x: clip; }
/* Ältere Browser kennen clip noch nicht — dort kappt hidden, damit nichts
   Breites die Seite seitlich verschieben kann. */
@supports not (overflow: clip) { .stage { overflow-x: hidden; } }
.view { display: none; animation: viewIn var(--t-mid) var(--ease); }
.view.active { display: block; }
@keyframes viewIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.col-narrow { max-width: 640px; margin: 0 auto; }
.col-wide   { max-width: 820px; margin: 0 auto; display: grid; gap: var(--sp-4); }

.view-title { font-size: var(--fs-xl); font-weight: 800; margin: 0 0 4px; letter-spacing: -0.02em; }
.view-sub   { color: var(--t-soft); margin: 0 0 var(--sp-5); font-size: var(--fs-sm); }

/* ── Footer ── */
.app-footer {
  margin-top: var(--sp-7);
  padding: var(--sp-5) var(--sp-4);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  font-size: var(--fs-xs); color: var(--t-faint);
  border-top: 1px solid var(--glass-bd);
}
.app-footer a, .link-btn { color: inherit; text-decoration: none; font-size: inherit; }
.app-footer a:hover, .link-btn:hover { color: var(--accent); }
.af-nav, .af-legal { display: flex; gap: var(--sp-4); }

/* Als installierte App: Leiste flacher halten, Sicherheitszone deckeln */
@media (display-mode: standalone) {
  :root { --nav-h: 54px; --nav-pad-b: min(var(--safe-b), 18px); }
}
@media (display-mode: fullscreen) {
  :root { --nav-h: 54px; --nav-pad-b: min(var(--safe-b), 18px); }
}

/* ══════════════ DESKTOP ══════════════ */
/* Als installierte App: Leiste flacher halten, Sicherheitszone deckeln */
@media (display-mode: standalone) {
  :root { --nav-h: 54px; --nav-pad-b: min(var(--safe-b), 18px); }
}
@media (display-mode: fullscreen) {
  :root { --nav-h: 54px; --nav-pad-b: min(var(--safe-b), 18px); }
}

/* ══════════════ DESKTOP ══════════════
   Eine ganz normale, durchgehend scrollende Seite. Links die Leiste, die
   stehen bleibt; rechts der Inhalt. Keine Box scrollt in einer anderen Box. */
@media (min-width: 900px) {
  .shell {
    padding-bottom: var(--sp-6);
    display: grid;
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    grid-template-rows: auto auto auto;
  }

  .nav {
    position: sticky; inset: auto; top: 0;
    grid-column: 1; grid-row: 1 / -1;
    align-self: start;
    width: auto; height: 100dvh;
    flex-direction: column; justify-content: center; gap: var(--sp-2);
    padding: var(--sp-6) var(--sp-2);
    border-top: none; border-right: 1px solid var(--glass-bd);
    background: transparent; backdrop-filter: none; -webkit-backdrop-filter: none;
  }
  .nav-btn { flex: 0 0 auto; padding: var(--sp-3) 0; border-radius: var(--r-md); font-size: 0.68rem; }
  .nav-btn svg { width: 23px; height: 23px; }
  .nav-btn.active { background: var(--glass-2); }
  .nav-btn.active::before { top: 50%; left: 0; transform: translateY(-50%); width: 3px; height: 24px; border-radius: 0 3px 3px 0; }

  .topbar { grid-column: 2; grid-row: 1; padding-left: var(--sp-6); padding-right: var(--sp-6); }
  .stage { grid-column: 2; grid-row: 2; padding: 0 var(--sp-6); }
  .app-footer {
    grid-column: 2; grid-row: 3;
    flex-direction: row; justify-content: center; gap: var(--sp-5);
    padding: var(--sp-4) var(--sp-6);
  }

  .brand-logo { height: 30px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Läuft eine Session, verschwindet das untere Menü ganz — es führt ohnehin
   nirgendwohin, und der Platz gehört dem Atem. Danach ist es wieder da.
   Der Sockel unter dem Inhalt geht mit, sonst bliebe ein leerer Streifen. */
.nav { transition: opacity var(--t-mid) var(--ease), transform var(--t-mid) var(--ease); }
body.running .nav {
  opacity: 0;
  transform: translateY(100%);
  pointer-events: none;
}
body.running .shell { padding-bottom: var(--sp-6); }