html, body {
  margin: 0;
  padding: 0;
  background: #f4f6f8;
  color: #111827;
  font-family: Arial, Helvetica, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
}

.hlavicka {
  width: 100%;
  margin: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 440px;
  align-items: stretch;
  gap: 8px;
}

.hlavicka-leva {
  min-width: 0;
  background: #ffffff;
  border-radius: 10px;
  padding: 8px 16px;
  box-shadow: 0 2px 14px rgba(0, 0, 0, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.nazev {
  margin: 0;
  font-size: 1.55rem;
  line-height: 1.12;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.popis {
  display: none;
}

.promo-box {
  background: #111111;
  color: #ffffff;
  border-radius: 10px;
  padding: 7px 14px;
  box-shadow: 0 2px 14px rgba(0, 0, 0, 0.20);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.promo-radek {
  font-size: 0.82rem;
  line-height: 1.16;
  font-weight: 600;
}

.promo-radek + .promo-radek {
  margin-top: 3px;
  font-weight: 500;
  color: #e5e7eb;
}

.promo-radek-prohlizec {
  color: #facc15;
  font-size: 0.78rem;
}

.graf {
  width: calc(100% - 12px);
  margin: 0 auto 6px auto;
  background: #ffffff;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
}

.graf iframe {
  display: block;
  width: 100%;
  height: calc(100vh - 88px);
  min-height: 650px;
  border: 0;
  background: #ffffff;
}

/* Mensi PC / tablet */
@media (max-width: 1050px) {
  .hlavicka {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .hlavicka-leva {
    padding: 11px 15px;
  }

  .nazev {
    font-size: 1.45rem;
  }

  .promo-box {
    min-height: auto;
  }

  .graf iframe {
    height: calc(100vh - 185px);
    min-height: 560px;
  }
}

/* Android / mobil na vysku */
@media (max-width: 760px) {
  html, body {
    background: #ffffff;
  }

  .hlavicka {
    width: 100%;
    margin: 0;
    padding: 6px 8px 5px 8px;
    display: block;
    background: #f4f6f8;
  }

  .hlavicka-leva {
    padding: 8px 10px;
    border-radius: 8px;
    box-shadow: none;
    border: 1px solid #e5e7eb;
  }

  .nazev {
    font-size: 1.00rem;
    line-height: 1.16;
    letter-spacing: 0;
  }

  .promo-box {
    display: flex;
    margin-top: 6px;
    padding: 8px 10px;
    border-radius: 8px;
    box-shadow: none;
  }

  .promo-radek {
    font-size: 0.75rem;
    line-height: 1.18;
    font-weight: 600;
  }

  .promo-radek + .promo-radek {
    margin-top: 3px;
  }

  .promo-radek-prohlizec {
    font-size: 0.73rem;
  }

  .graf {
    width: 100%;
    margin: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .graf iframe {
    height: calc(100dvh - 113px);
    min-height: calc(100dvh - 113px);
    border-radius: 0;
  }
}

/* Android / mobil na sirku: maximalni prostor pro graf */
@media (max-height: 520px) and (orientation: landscape) {
  html, body {
    background: #ffffff;
    overflow: hidden;
  }

  .hlavicka {
    display: none;
  }

  .graf {
    width: 100%;
    height: 100dvh;
    margin: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .graf iframe {
    height: 100dvh;
    min-height: 100dvh;
    border-radius: 0;
  }
}

/* Velmi male displeje */
@media (max-width: 380px) {
  .nazev {
    font-size: 0.92rem;
  }

  .promo-radek {
    font-size: 0.70rem;
  }

  .promo-radek-prohlizec {
    font-size: 0.68rem;
  }

  .graf iframe {
    height: calc(100dvh - 110px);
    min-height: calc(100dvh - 110px);
  }
}