/* ---------- Barvy (světlý režim) ---------- */
:root {
  --pozadi: #f6f7fb;
  --karta: rgba(255, 255, 255, 0.82);
  --karta-okraj: rgba(15, 23, 42, 0.08);
  --text: #0f172a;
  --text-jemny: #64748b;
  --pole: #ffffff;
  --pole-okraj: #e2e8f0;
  --akcent: #6366f1;
  --akcent-2: #a855f7;
  --akcent-zare: rgba(99, 102, 241, 0.25);
  --chyba: #dc2626;
  --chyba-pozadi: #fef2f2;
  --myslenka-pozadi: #f5f3ff;
  --stin: 0 1px 2px rgba(15, 23, 42, 0.04), 0 12px 40px rgba(15, 23, 42, 0.08);
  --blob-1: #c7d2fe;
  --blob-2: #e9d5ff;
  --blob-3: #a5f3fc;
  color-scheme: light;
}

/* ---------- Tmavý režim podle nastavení zařízení ---------- */
@media (prefers-color-scheme: dark) {
  :root {
    --pozadi: #0b0f1a;
    --karta: rgba(20, 25, 40, 0.75);
    --karta-okraj: rgba(255, 255, 255, 0.08);
    --text: #f1f5f9;
    --text-jemny: #94a3b8;
    --pole: rgba(255, 255, 255, 0.04);
    --pole-okraj: rgba(255, 255, 255, 0.12);
    --akcent: #818cf8;
    --akcent-2: #c084fc;
    --akcent-zare: rgba(129, 140, 248, 0.3);
    --chyba: #f87171;
    --chyba-pozadi: rgba(248, 113, 113, 0.1);
    --myslenka-pozadi: rgba(129, 140, 248, 0.08);
    --stin: 0 12px 40px rgba(0, 0, 0, 0.4);
    --blob-1: #312e81;
    --blob-2: #581c87;
    --blob-3: #134e4a;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: 0 1rem;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  background: var(--pozadi);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

/* ---------- Barevné skvrny v pozadí ---------- */
.pozadi {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}
.pozadi span {
  position: absolute;
  width: 40rem;
  height: 40rem;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.55;
  animation: vznaset 22s ease-in-out infinite alternate;
}
.pozadi span:nth-child(1) { background: var(--blob-1); top: -15rem; left: -10rem; }
.pozadi span:nth-child(2) { background: var(--blob-2); bottom: -18rem; right: -12rem; animation-delay: -7s; }
.pozadi span:nth-child(3) { background: var(--blob-3); top: 40%; left: 55%; width: 24rem; height: 24rem; opacity: 0.35; animation-delay: -14s; }

@keyframes vznaset {
  to { transform: translate(4rem, 3rem) scale(1.1); }
}

/* ---------- Hlavička ---------- */
.hlavicka {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 64rem;
  margin: 0 auto;
  padding: 1.25rem 0;
}
.znacka {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}
.znacka img { display: block; }

.odkaz {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--karta-okraj);
  border-radius: 999px;
  background: var(--karta);
  color: var(--text-jemny);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  backdrop-filter: blur(12px);
  transition: color 0.15s, border-color 0.15s;
}
.odkaz:hover { color: var(--text); border-color: var(--pole-okraj); }
.odkaz svg { width: 1rem; height: 1rem; }

/* ---------- Karta ---------- */
main {
  flex: 1;
  display: grid;
  place-items: center;
  padding-bottom: 4rem;
}

.karta {
  width: 100%;
  max-width: 26rem;
  padding: 2.5rem 2rem;
  border: 1px solid var(--karta-okraj);
  border-radius: 1.5rem;
  background: var(--karta);
  box-shadow: var(--stin);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  animation: objevit 0.4s ease-out;
}
@keyframes objevit {
  from { opacity: 0; transform: translateY(8px); }
}

h1 {
  margin: 0 0 0.35rem;
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
}
.podtitul {
  margin: 0 0 2rem;
  color: var(--text-jemny);
}

/* ---------- Formulář ---------- */
label {
  display: block;
  margin: 1.1rem 0 0.4rem;
  font-size: 0.875rem;
  font-weight: 600;
}

input {
  width: 100%;
  height: 3rem;
  padding: 0 1rem;
  border: 1px solid var(--pole-okraj);
  border-radius: 0.75rem;
  background: var(--pole);
  color: var(--text);
  font: inherit;
  transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus {
  outline: none;
  border-color: var(--akcent);
  box-shadow: 0 0 0 4px var(--akcent-zare);
}

.heslo-pole { position: relative; }
.heslo-pole input { padding-right: 3rem; }
.oko {
  position: absolute;
  top: 0;
  right: 0;
  width: 3rem;
  height: 3rem;
  display: grid;
  place-items: center;
  border: none;
  background: none;
  color: var(--text-jemny);
  cursor: pointer;
}
.oko:hover { color: var(--text); }
.oko svg { width: 1.25rem; height: 1.25rem; }
.oko .ikona-skryt { display: none; }
.oko.zobrazeno .ikona-ukazat { display: none; }
.oko.zobrazeno .ikona-skryt { display: block; }

svg {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.tlacitko {
  width: 100%;
  height: 3.25rem;
  margin-top: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: none;
  border-radius: 0.75rem;
  background: linear-gradient(135deg, var(--akcent), var(--akcent-2));
  color: #fff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 8px 24px var(--akcent-zare);
  transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s;
}
.tlacitko:hover { transform: translateY(-1px); box-shadow: 0 12px 28px var(--akcent-zare); }
.tlacitko:active { transform: translateY(0); }
.tlacitko:disabled { opacity: 0.6; cursor: wait; transform: none; }
.tlacitko svg { width: 1.15rem; height: 1.15rem; transition: transform 0.15s; }
.tlacitko:hover svg { transform: translateX(3px); }

.chyba {
  margin: 1rem 0 0;
  padding: 0.75rem 1rem;
  border-radius: 0.75rem;
  background: var(--chyba-pozadi);
  color: var(--chyba);
  font-size: 0.9rem;
  font-weight: 600;
}

/* ---------- Po přihlášení ---------- */
#vitej { text-align: center; }

.avatar {
  width: 4.5rem;
  height: 4.5rem;
  margin: 0 auto 1.25rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--akcent), var(--akcent-2));
  color: #fff;
  font-size: 1.75rem;
  font-weight: 800;
  box-shadow: 0 8px 24px var(--akcent-zare);
}

.myslenka {
  margin: 0;
  padding: 1.25rem 1.5rem;
  border-radius: 1rem;
  background: var(--myslenka-pozadi);
  text-align: left;
}
.myslenka figcaption {
  margin-bottom: 0.4rem;
  color: var(--akcent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.myslenka blockquote {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 500;
  line-height: 1.45;
}
.myslenka cite {
  display: block;
  margin-top: 0.5rem;
  color: var(--text-jemny);
  font-size: 0.9rem;
  font-style: normal;
}
.myslenka cite::before { content: "— "; }
.myslenka blockquote::before { content: "„"; }
.myslenka blockquote::after { content: "“"; }

/* ---------- Načítání ---------- */
#nacitani { display: grid; place-items: center; min-height: 10rem; }
.spinner {
  width: 2rem;
  height: 2rem;
  border: 3px solid var(--pole-okraj);
  border-top-color: var(--akcent);
  border-radius: 50%;
  animation: tocit 0.8s linear infinite;
}
@keyframes tocit { to { transform: rotate(360deg); } }

/* ---------- Mobil ---------- */
@media (max-width: 480px) {
  .karta { padding: 2rem 1.25rem; border-radius: 1.25rem; }
  h1 { font-size: 1.5rem; }
}

/* Méně pohybu pro ty, kdo si to nastavili */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}