/* ============================================================
   Mathe-Sturm – Styles
   Palette: Elektroblau #3b82f6 + Gewitter-Violett, dynamisch
   ============================================================ */

:root {
  --blue: #3b82f6;
  --blue-bright: #60a5fa;
  --violet: #7c3aed;
  --violet-bright: #a855f7;
  --gold: #fbbf24;
  --green: #22c55e;
  --red: #ef4444;

  --radius: 18px;
  --radius-sm: 12px;
  --gap: 14px;
  --maxw: 560px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --ease: cubic-bezier(.2,.8,.2,1);
}

/* Dunkelmodus (Standard) */
[data-theme="dark"] {
  --bg: #0b1020;
  --bg-grad-1: #131a3a;
  --bg-grad-2: #1a1140;
  --surface: rgba(28, 36, 68, 0.72);
  --surface-2: rgba(40, 50, 92, 0.6);
  --border: rgba(120, 140, 220, 0.22);
  --text: #eef2ff;
  --text-dim: #aab4dd;
  --shadow: 0 14px 40px rgba(0, 0, 0, 0.45);
  --key-bg: linear-gradient(180deg, #232c52, #1a2244);
  --key-bg-active: linear-gradient(180deg, #3b82f6, #6d28d9);
}

/* Hellmodus */
[data-theme="light"] {
  --bg: #eef2ff;
  --bg-grad-1: #dde6ff;
  --bg-grad-2: #ece4ff;
  --surface: rgba(255, 255, 255, 0.86);
  --surface-2: rgba(243, 246, 255, 0.92);
  --border: rgba(80, 90, 160, 0.18);
  --text: #141a33;
  --text-dim: #515c84;
  --shadow: 0 12px 32px rgba(60, 70, 130, 0.18);
  --key-bg: linear-gradient(180deg, #ffffff, #eef2ff);
  --key-bg-active: linear-gradient(180deg, #3b82f6, #7c3aed);
}

* { box-sizing: border-box; }

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

body {
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1100px 600px at 12% -8%, var(--bg-grad-1), transparent 60%),
    radial-gradient(900px 600px at 100% 0%, var(--bg-grad-2), transparent 55%),
    var(--bg);
  background-attachment: fixed;
  min-height: 100dvh;
  padding:
    calc(env(safe-area-inset-top, 0px))
    calc(env(safe-area-inset-right, 0px))
    calc(env(safe-area-inset-bottom, 0px))
    calc(env(safe-area-inset-left, 0px));
  -webkit-tap-highlight-color: transparent;
  overflow-x: hidden;
}

.visually-hidden, .skip-link {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}
.skip-link:focus {
  position: fixed; top: 8px; left: 8px;
  width: auto; height: auto;
  clip: auto; margin: 0;
  z-index: 100;
  background: var(--blue);
  color: #fff;
  padding: 10px 14px;
  border-radius: 10px;
}

/* ---------- Header ---------- */
.app-header {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 16px 4px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 8px; }
.brand-bolt {
  font-size: 1.5rem;
  filter: drop-shadow(0 0 8px rgba(251, 191, 36, 0.7));
  animation: pulse 2.4s var(--ease) infinite;
}
.brand-name {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: 0.3px;
  background: linear-gradient(90deg, var(--blue-bright), var(--violet-bright));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.icon-btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  width: 44px; height: 44px;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  display: grid; place-items: center;
  transition: transform .15s var(--ease), background .2s;
}
.icon-btn:hover { transform: scale(1.06); }
.icon-btn:active { transform: scale(0.94); }

/* ---------- Main / Screens ---------- */
.app-main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 10px 16px 28px;
}
.screen { display: none; flex-direction: column; gap: var(--gap); animation: fadeIn .3s var(--ease); }
.screen.is-active { display: flex; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* ---------- Cards ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.card-title {
  margin: 0 0 12px;
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.hero-card {
  background: linear-gradient(135deg, rgba(59,130,246,0.18), rgba(124,58,237,0.22));
  text-align: center;
}
.hero-kicker {
  margin: 0 0 6px;
  font-weight: 800;
  color: var(--gold);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  font-size: 0.8rem;
}
.hero-title { margin: 0 0 6px; font-size: 1.5rem; font-weight: 900; line-height: 1.15; }
.hero-sub { margin: 0; color: var(--text-dim); }

/* ---------- Chips ---------- */
.chip-row { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  flex: 1 1 auto;
  min-width: 84px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-size: 0.98rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform .12s var(--ease), border-color .2s, background .2s, box-shadow .2s;
}
.chip:hover { transform: translateY(-2px); }
.chip[aria-pressed="true"] {
  border-color: transparent;
  background: linear-gradient(135deg, var(--blue), var(--violet));
  color: #fff;
  box-shadow: 0 8px 22px rgba(59, 130, 246, 0.4);
}

/* ---------- Inputs ---------- */
.text-input {
  width: 100%;
  padding: 13px 14px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
}
.text-input::placeholder { color: var(--text-dim); }
.text-input:focus { outline: none; border-color: var(--blue-bright); box-shadow: 0 0 0 3px rgba(59,130,246,0.3); }

/* ---------- Buttons ---------- */
.btn {
  border: 1.5px solid transparent;
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  font-size: 1.02rem;
  font-weight: 800;
  font-family: inherit;
  cursor: pointer;
  transition: transform .12s var(--ease), box-shadow .2s, background .2s, opacity .2s;
}
.btn:active { transform: scale(0.97); }
.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--violet));
  box-shadow: 0 10px 28px rgba(59, 130, 246, 0.42);
}
.btn-primary:hover { box-shadow: 0 14px 34px rgba(124, 58, 237, 0.5); }
.btn-big { padding: 17px; font-size: 1.15rem; }
.btn-ghost {
  background: var(--surface-2);
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { border-color: var(--blue-bright); }
.btn-small { padding: 8px 12px; font-size: 0.85rem; }
.btn-quit { margin-top: 4px; }

/* ---------- HUD ---------- */
.hud {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
}
.hud-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 8px;
  text-align: center;
  box-shadow: var(--shadow);
}
.hud-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dim);
}
.hud-value { display: block; font-size: 1.5rem; font-weight: 900; margin-top: 2px; }
.hud-time .hud-value { color: var(--gold); }
.hud-time.is-low .hud-value { color: var(--red); animation: blink .8s steps(2, start) infinite; }

/* ---------- Timebar ---------- */
.timebar {
  height: 12px;
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  overflow: hidden;
}
.timebar-fill {
  height: 100%;
  width: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--blue), var(--violet-bright));
  transform-origin: left center;
  transition: width .25s linear, background .3s;
}
.timebar-fill.is-low { background: linear-gradient(90deg, #f59e0b, var(--red)); }

/* ---------- Question ---------- */
.question-card { text-align: center; position: relative; padding: 22px 16px; }
.combo-flash {
  position: absolute;
  top: 8px; left: 0; right: 0;
  margin: 0;
  font-weight: 900;
  color: var(--gold);
  opacity: 0;
  pointer-events: none;
  font-size: 0.95rem;
  letter-spacing: 0.5px;
}
.combo-flash.show { animation: comboPop .7s var(--ease); }

.question {
  margin: 6px 0 16px;
  font-size: clamp(2.2rem, 11vw, 3.2rem);
  font-weight: 900;
  letter-spacing: 1px;
  line-height: 1.1;
}
.answer-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 64px;
}
.answer-display {
  min-width: 140px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 2px dashed var(--border);
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: 1px;
}
.answer-display.flash-ok { animation: okFlash .4s var(--ease); border-style: solid; border-color: var(--green); }
.answer-display.flash-bad { animation: badShake .4s var(--ease); border-style: solid; border-color: var(--red); }
.feedback-badge { font-size: 1.6rem; min-width: 1.6rem; }

/* ---------- Keypad ---------- */
.keypad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.key {
  padding: 18px 0;
  font-size: 1.5rem;
  font-weight: 800;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--key-bg);
  color: var(--text);
  cursor: pointer;
  transition: transform .08s var(--ease), box-shadow .15s, background .15s;
  user-select: none;
}
.key:hover { transform: translateY(-1px); }
.key:active, .key.is-press {
  transform: scale(0.95);
  background: var(--key-bg-active);
  color: #fff;
  box-shadow: 0 6px 18px rgba(59, 130, 246, 0.45);
}
.key-fn { font-size: 1.3rem; color: var(--text-dim); }

/* ---------- Countdown overlay ---------- */
.countdown {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(7, 11, 28, 0.78);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 80;
}
.countdown-num {
  font-size: clamp(5rem, 30vw, 10rem);
  font-weight: 900;
  background: linear-gradient(135deg, var(--blue-bright), var(--violet-bright), var(--gold));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: cdPop .7s var(--ease);
}

/* ---------- Result ---------- */
.result-card {
  text-align: center;
  background: linear-gradient(135deg, rgba(59,130,246,0.2), rgba(124,58,237,0.24));
}
.result-kicker { margin: 0 0 4px; font-weight: 800; color: var(--gold); text-transform: uppercase; letter-spacing: 0.6px; }
.result-score {
  margin: 6px 0 0;
  font-size: clamp(3.5rem, 22vw, 5.5rem);
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(135deg, var(--blue-bright), var(--violet-bright));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.result-label { margin: 0 0 14px; color: var(--text-dim); font-weight: 700; letter-spacing: 1px; text-transform: uppercase; font-size: 0.8rem; }
.result-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 6px;
}
.result-stat {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 6px;
}
.result-stat b { display: block; font-size: 1.25rem; }
.result-stat span { display: block; font-size: 0.72rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.4px; margin-top: 2px; }
.result-best {
  margin: 14px 0 0;
  font-weight: 900;
  color: var(--gold);
  font-size: 1.05rem;
  animation: comboPop .8s var(--ease);
}

/* ---------- Scores ---------- */
.scores-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.scores-head .card-title { margin: 0; }
.scores-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.score-row {
  display: grid;
  grid-template-columns: 34px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 11px 12px;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 1px solid var(--border);
}
.score-row.is-top { border-color: var(--gold); box-shadow: 0 0 0 1px rgba(251,191,36,0.4); }
.score-rank { font-weight: 900; color: var(--text-dim); text-align: center; }
.score-row.is-top .score-rank { color: var(--gold); }
.score-name { font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.score-meta { font-size: 0.72rem; color: var(--text-dim); font-weight: 600; }
.score-pts { font-weight: 900; font-size: 1.15rem; }
.scores-empty { color: var(--text-dim); text-align: center; padding: 10px 0; margin: 0; }
.scores-empty[hidden] { display: none; }

/* ---------- Toast ---------- */
.toast-host {
  position: fixed;
  left: 50%;
  bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: min(92vw, 420px);
  pointer-events: none;
}
.toast {
  background: linear-gradient(135deg, var(--blue), var(--violet));
  color: #fff;
  padding: 13px 16px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  box-shadow: var(--shadow);
  animation: toastIn .25s var(--ease);
}
.toast.is-out { animation: toastOut .25s var(--ease) forwards; }

/* ---------- Modal ---------- */
.modal-host { position: fixed; inset: 0; z-index: 95; display: grid; place-items: center; padding: 20px; }
.modal-host[hidden] { display: none; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(7,11,28,0.7); backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); }
.modal {
  position: relative;
  z-index: 1;
  width: min(92vw, 400px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  animation: cdPop .25s var(--ease);
}
.modal-title { margin: 0 0 8px; font-size: 1.2rem; font-weight: 900; }
.modal-text { margin: 0 0 18px; color: var(--text-dim); }
.modal-actions { display: flex; gap: 10px; }
.modal-actions .btn { flex: 1; }

/* ---------- Focus ---------- */
:focus-visible {
  outline: 3px solid var(--blue-bright);
  outline-offset: 2px;
  border-radius: 8px;
}

/* ---------- Animations ---------- */
@keyframes pulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.18); } }
@keyframes blink { 50% { opacity: 0.35; } }
@keyframes okFlash { 0% { transform: scale(1); } 40% { transform: scale(1.12); } 100% { transform: scale(1); } }
@keyframes badShake { 0%,100% { transform: translateX(0); } 20% { transform: translateX(-8px); } 40% { transform: translateX(8px); } 60% { transform: translateX(-5px); } 80% { transform: translateX(5px); } }
@keyframes comboPop { 0% { opacity: 0; transform: translateY(6px) scale(0.9); } 30% { opacity: 1; transform: translateY(0) scale(1.05); } 100% { opacity: 0; transform: translateY(-10px) scale(1); } }
@keyframes cdPop { 0% { opacity: 0; transform: scale(0.5); } 60% { opacity: 1; transform: scale(1.1); } 100% { opacity: 1; transform: scale(1); } }
@keyframes toastIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
@keyframes toastOut { to { opacity: 0; transform: translateY(12px); } }

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* ---------- Larger screens ---------- */
@media (min-width: 600px) {
  .key { padding: 22px 0; font-size: 1.7rem; }
  .app-main { padding-bottom: 40px; }
}