/* ---------------------------------------------------------------------------
   4-7-8 Atmung — minimalistisches Stylesheet
   Farben über CSS-Variablen; System-, Hell- und Dunkelmodus.
--------------------------------------------------------------------------- */

:root {
  /* Hell (Default) */
  --bg: #f4f6f8;
  --fg: #3a4048;
  --muted: #9aa4ae;
  --panel-bg: #ffffff;
  --panel-border: #e4e8ec;
  --track: rgba(0, 0, 0, 0.06);

  /* Phasenfarben */
  --c-inhale: #7fb77e;     /* Einatmen – beruhigendes Grün */
  --c-hold-start: #ecd68f; /* Halten – sanftes Gelb ... */
  --c-hold-end: #f2994a;   /* ... innerer Timer-Ring in Orange */
  --c-exhale: #6fa8dc;     /* Ausatmen – beruhigendes Blau */
  --c-idle: #c8d0d8;       /* Ruhezustand */
  --accent: #8a94a0;       /* monochrom, wenn Farbwechsel aus */
}

/* Dunkel per System-Einstellung (nur wenn nicht explizit auf Hell gestellt) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1116;
    --fg: #c4ccd4;
    --muted: #5b6672;
    --panel-bg: #161b22;
    --panel-border: #262d36;
    --track: rgba(255, 255, 255, 0.07);
    --c-inhale: #6fae72;
    --c-hold-start: #d8c17f;
    --c-hold-end: #dc8b46;
    --c-exhale: #6398c9;
    --c-idle: #2a323b;
    --accent: #79838f;
  }
}

/* Dunkel explizit erzwungen */
:root[data-theme="dark"] {
  --bg: #0e1116;
  --fg: #c4ccd4;
  --muted: #5b6672;
  --panel-bg: #161b22;
  --panel-border: #262d36;
  --track: rgba(255, 255, 255, 0.07);
  --c-inhale: #6fae72;
  --c-hold-start: #d8c17f;
  --c-hold-end: #dc8b46;
  --c-exhale: #6398c9;
  --c-idle: #2a323b;
  --accent: #79838f;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
  transition: background-color 0.6s ease, color 0.6s ease;
}

/* --- Bühne mit dem Kreis --- */
.stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  padding: 1rem;
}

.breath {
  position: relative;
  width: min(78vw, 78vh, 460px);
  height: min(78vw, 78vh, 460px);
  padding: 0;
  border: none;
  background: none;
  cursor: pointer;
  display: grid;
  place-items: center;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.breath:focus-visible {
  outline: 2px solid var(--muted);
  outline-offset: 8px;
  border-radius: 50%;
}

.breath-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.fill {
  fill: var(--c-idle);
  transform-box: fill-box;
  transform-origin: center;
  transform: scale(0.35);
  /* Mini-Transition beim Farbwechsel zwischen den Phasen */
  transition: fill 0.5s ease;
}

/* Sanftes Zurückgleiten beim Beenden */
.breath.smooth .fill { transition: transform 0.8s ease, fill 0.8s ease; }

.ring {
  fill: none;
  stroke: var(--c-hold-end);
  stroke-width: 5;
  stroke-linecap: round;
  opacity: 0;
  /* Genau am Rand (r = 77.5, Außenkante bündig mit Füllung r = 80).
     Umfang 2·π·77.5 ≈ 486.95; Start oben (−90°) */
  stroke-dasharray: 486.95;
  stroke-dashoffset: 486.95;
  transform: rotate(-90deg);
  transform-origin: center;
  transition: opacity 0.4s ease;
}

/* --- Steuer-Icons (Play/Stopp) --- */
.ctrl-icon {
  position: absolute;
  width: 16%;
  height: 16%;
  fill: rgba(255, 255, 255, 0.85);
  pointer-events: none;
  transition: opacity 0.3s ease;
}
:root[data-theme="dark"] .ctrl-icon,
:root:not([data-theme="light"]) .ctrl-icon { fill: rgba(255, 255, 255, 0.9); }

.play-icon { opacity: 0.9; }
.stop-icon { opacity: 0; }

/* Während des Laufens: Play verbergen, Stopp nur bei Hover/Fokus zeigen */
.stage.running .play-icon { opacity: 0; }
.stage.running .breath:hover .stop-icon,
.stage.running .breath:focus-visible .stop-icon { opacity: 0.85; }

/* --- Phasen-Text (zentriert über der farbigen Füllung, in beiden Modi lesbar) --- */
.phase-text {
  position: absolute;
  font-size: clamp(0.85rem, 2.6vw, 1.1rem);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #fff;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.28);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}
.stage.running.show-phase .phase-text { opacity: 0.85; }
/* Beim Hover/Fokus weicht der Text dem Stopp-Icon (keine Überlagerung) */
.stage.running.show-phase .breath:hover .phase-text,
.stage.running.show-phase .breath:focus-visible .phase-text { opacity: 0; }

/* --- Zyklus-Zähler --- */
.counter {
  min-height: 1.2em;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  opacity: 0;
  transition: opacity 0.4s ease;
}
.stage.running.show-counter .counter { opacity: 1; }

/* --- Zahnrad --- */
.settings-toggle {
  position: fixed;
  top: max(0.9rem, env(safe-area-inset-top));
  right: max(0.9rem, env(safe-area-inset-right));
  width: 40px;
  height: 40px;
  border: none;
  background: none;
  padding: 8px;
  cursor: pointer;
  color: var(--muted);
  opacity: 0.4;
  transition: opacity 0.25s ease, transform 0.4s ease;
  -webkit-tap-highlight-color: transparent;
}
.settings-toggle:hover,
.settings-toggle:focus-visible { opacity: 0.9; outline: none; }
.settings-toggle[aria-expanded="true"] { opacity: 0.9; transform: rotate(30deg); }
.settings-toggle svg { width: 100%; height: 100%; fill: currentColor; }

/* --- Einstellungs-Panel --- */
.settings-panel {
  position: fixed;
  top: max(3.4rem, calc(env(safe-area-inset-top) + 3rem));
  right: max(0.9rem, env(safe-area-inset-right));
  width: min(88vw, 300px);
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  padding: 0.5rem 1rem 1rem;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.14);
  z-index: 10;
}
.settings-panel[hidden] { display: none; }

.settings-panel h2 {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0.9rem 0 0.4rem;
}

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 0;
  font-size: 0.95rem;
  border-top: 1px solid var(--panel-border);
}
.row:first-of-type { border-top: none; }

.settings-panel select {
  font: inherit;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 0.3rem 0.5rem;
  cursor: pointer;
}

/* Schalter */
.switch-row { cursor: pointer; }
.switch {
  appearance: none;
  -webkit-appearance: none;
  width: 42px;
  height: 24px;
  border-radius: 12px;
  background: var(--track);
  position: relative;
  cursor: pointer;
  transition: background-color 0.25s ease;
  flex: none;
}
.switch::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
  transition: transform 0.25s ease;
}
.switch:checked { background: var(--c-inhale); }
.switch:checked::after { transform: translateX(18px); }
.switch:focus-visible { outline: 2px solid var(--muted); outline-offset: 2px; }

/* --- Fußzeile --- */
.footer {
  position: fixed;
  bottom: max(0.7rem, env(safe-area-inset-bottom));
  left: 0;
  right: 0;
  text-align: center;
  font-size: 0.9rem;
  color: var(--muted);
  opacity: 0.5;
  transition: opacity 0.25s ease;
}
.footer:hover { opacity: 0.9; }
.footer a { color: inherit; text-decoration: none; }
.footer a:hover { text-decoration: underline; }
.footer span { margin: 0 0.4em; }

/* --- Rechtstext-Seiten (impressum/datenschutz) --- */
.legal {
  overflow: auto;
  display: block;
}
.legal .content {
  max-width: 640px;
  margin: 0 auto;
  padding: 4rem 1.4rem 6rem;
  line-height: 1.6;
}
.legal h1 { font-size: 1.5rem; margin-bottom: 0.4rem; }
.legal h2 { font-size: 1rem; margin-top: 2rem; }
.legal a { color: var(--c-exhale); }
.legal .back {
  display: inline-block;
  margin-bottom: 2rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
}
.legal .back:hover { text-decoration: underline; }

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