/* ¤¤¤ Fonty ¤¤¤ */

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("./assets/fonts/inter-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("./assets/fonts/inter-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("./assets/fonts/space-grotesk-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("./assets/fonts/space-grotesk-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

/* ¤¤¤ Tokeny ¤¤¤ */

:root {
  --a: #22d3ee;
  --b: #a78bfa;
  --ink: #070810;

  --text: rgba(226, 232, 240, .92);
  --muted: rgba(148, 163, 184, .92);

  --panel: rgba(255, 255, 255, .035);
  --line: rgba(255, 255, 255, .10);
  --shadow: 0 24px 70px rgba(0, 0, 0, .45);

  /* Karta číselníku. Horní půlka je o odstín světlejší než spodní,
     díky tomu čte šev jako u skutečných překlápěcích hodin.
     Pozadí musí být neprůhledné: přes poloprůhledný list by se při
     překlápění prolínala stará i nová číslice zároveň. */
  --cardTopBg: linear-gradient(180deg, #1b2231, #151b27);
  --cardBottomBg: linear-gradient(180deg, #121722, #0e131c);
  --cardLine: rgba(255, 255, 255, .09);
  --cardShadow: 0 18px 44px rgba(0, 0, 0, .55);
  --seam: rgba(0, 0, 0, .62);
  --digitColor: #f1f5f9;
}

html {
  color-scheme: dark;
}

html[data-theme="light"] {
  color-scheme: light;

  --ink: #eef2f8;
  --text: rgba(30, 41, 59, .94);
  --muted: rgba(71, 85, 105, .9);

  --panel: rgba(15, 23, 42, .04);
  --line: rgba(15, 23, 42, .12);
  --shadow: 0 24px 70px rgba(15, 23, 42, .14);

  --cardTopBg: linear-gradient(180deg, #ffffff, #f3f6fb);
  --cardBottomBg: linear-gradient(180deg, #e9eef6, #dfe6f0);
  --cardLine: rgba(15, 23, 42, .1);
  --cardShadow: 0 18px 40px rgba(15, 23, 42, .16);
  --seam: rgba(15, 23, 42, .24);
  --digitColor: #0f172a;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* Plynulý přechod při přepnutí motivu. Třídu přidává a po 320 ms odebírá app.js,
   aby se přechod nespouštěl i u ostatních animací. */
.theme-transition *,
.theme-transition *::before,
.theme-transition *::after {
  transition: background-color .3s ease, background-image .3s ease, color .3s ease, border-color .3s ease, box-shadow .3s ease !important;
}

/* ¤¤¤ Pozadí ¤¤¤ */

.bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bgGlow {
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 80%;
  background:
    radial-gradient(45% 55% at 25% 20%, color-mix(in srgb, var(--a) 26%, transparent), transparent 70%),
    radial-gradient(45% 55% at 78% 12%, color-mix(in srgb, var(--b) 24%, transparent), transparent 70%);
  filter: blur(40px);
  opacity: .55;
}

.bgGrid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(70% 60% at 50% 40%, #000 30%, transparent 75%);
  opacity: .5;
}

html[data-theme="light"] .bgGlow {
  opacity: .4;
}

/* ¤¤¤ Přepínač motivu ¤¤¤ */

.iconBtn {
  position: fixed;
  /* env() drzi tlacitko mimo vyrez a zakulacene rohy telefonu.
     Funguje diky viewport-fit=cover v <meta name="viewport">. */
  top: calc(clamp(12px, 3vw, 22px) + env(safe-area-inset-top, 0px));
  right: calc(clamp(12px, 3vw, 22px) + env(safe-area-inset-right, 0px));
  z-index: 5;
  display: grid;
  place-items: center;
  /* 44px je nejmensi pohodlny tap target na dotyku. */
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: border-color .2s ease, transform .2s ease, color .2s ease;
}

.iconBtn:hover {
  border-color: color-mix(in srgb, var(--a) 55%, var(--line));
  color: var(--a);
}

.iconBtn:active {
  transform: scale(.94);
}

.iconBtn:focus-visible {
  outline: 2px solid var(--a);
  outline-offset: 3px;
}

/* V tmavém motivu nabízíme slunce (přepni na světlo), ve světlém měsíc. */
.iconBtn .iconSun {
  display: block;
}

.iconBtn .iconMoon {
  display: none;
}

html[data-theme="light"] .iconBtn .iconSun {
  display: none;
}

html[data-theme="light"] .iconBtn .iconMoon {
  display: block;
}

/* ¤¤¤ Rozvržení ¤¤¤ */

.shell {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  min-height: 100dvh;
  padding: clamp(64px, 12vw, 96px) max(16px, env(safe-area-inset-right, 0px))
    calc(clamp(32px, 8vw, 64px) + env(safe-area-inset-bottom, 0px))
    max(16px, env(safe-area-inset-left, 0px));
}

.cd {
  display: grid;
  justify-items: center;
  gap: clamp(20px, 4vw, 34px);
  width: 100%;
  max-width: 1040px;
  text-align: center;
}

.cdTitle {
  margin: 0;
  font-size: clamp(1.35rem, 4.4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -.02em;
  color: var(--text);
}

.cdTitle:empty {
  display: none;
}

/* ¤¤¤ Číselník ¤¤¤ */

.cdClock {
  --cardH: clamp(88px, 17vw, 148px);
  --digit: clamp(2.5rem, 8.6vw, 4.6rem);
  --radius: clamp(10px, 1.6vw, 16px);

  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(8px, 2vw, 20px);
  justify-content: center;
  width: min(100%, 720px);
  opacity: 0;
  transition: opacity .35s ease;

  /* Cisla nejsou text k oznaceni; bez toho ho dvojite tuknuti na telefonu
     vybere a preblikne modrym vyberem. */
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

/* Číselník se odkryje až po načtení JSONu, jinak bliknou prázdné karty. */
.cd[data-state="running"] .cdClock {
  opacity: 1;
}

.cd[data-state="expired"] .cdClock,
.cd[data-state="error"] .cdClock {
  display: none;
}

.unit {
  display: grid;
  justify-items: center;
  gap: clamp(8px, 1.4vw, 12px);
  min-width: 0;
}

.unitLabel {
  font-size: clamp(.62rem, 1.5vw, .8rem);
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
}

.card {
  position: relative;
  width: 100%;
  height: var(--cardH);
  min-width: calc(var(--cardH) * .76);
  perspective: 900px;
  border-radius: var(--radius);
  box-shadow: var(--cardShadow);
}

/* Neviditelná rozpěrka drží šířku karty podle obsahu. Dny mohou mít tři i
   čtyři cifry, proto se šířka nesmí zadrátovat na dva znaky. */
.cardSizer {
  display: block;
  height: 100%;
  padding: 0 .2em;
  visibility: hidden;
  font-family: "Space Grotesk", "Inter", system-ui, sans-serif;
  font-size: var(--digit);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.cardHalf {
  position: absolute;
  left: 0;
  right: 0;
  height: 50%;
  overflow: hidden;
  border: 1px solid var(--cardLine);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.cardTop,
.leafTop {
  top: 0;
  border-bottom: 0;
  border-radius: var(--radius) var(--radius) 0 0;
  background: var(--cardTopBg);
}

.cardBottom,
.leafBottom {
  bottom: 0;
  border-top: 0;
  border-radius: 0 0 var(--radius) var(--radius);
  background: var(--cardBottomBg);
}

.halfInner {
  display: block;
  height: var(--cardH);
  line-height: var(--cardH);
  text-align: center;
  font-family: "Space Grotesk", "Inter", system-ui, sans-serif;
  font-size: var(--digit);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--digitColor);
}

/* Spodní půlky ukazují dolní část stejně vysoké číslice, proto se text
   vytáhne nahoru o polovinu výšky karty. */
.cardBottom .halfInner,
.leafBottom .halfInner {
  transform: translateY(-50%);
}

/* Šev drží nejvyšší vrstvu, ať je vidět i přes překlápějící se list. */
.card::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  transform: translateY(-1px);
  background: var(--seam);
  border-radius: 1px;
  z-index: 3;
  pointer-events: none;
}

/* ¤¤¤ Překlopení ¤¤¤ */

.leaf {
  z-index: 2;
  visibility: hidden;
}

.leafTop {
  transform-origin: center bottom;
  transform: rotateX(0deg);
}

.leafBottom {
  transform-origin: center top;
  transform: rotateX(90deg);
}

.card.isFlipping .leaf {
  visibility: visible;
}

.card.isFlipping .leafTop {
  animation: leafFold 200ms ease-in forwards;
}

.card.isFlipping .leafBottom {
  animation: leafFall 220ms 200ms ease-out forwards;
}

@keyframes leafFold {
  from {
    transform: rotateX(0deg);
  }

  to {
    transform: rotateX(-90deg);
  }
}

@keyframes leafFall {
  from {
    transform: rotateX(90deg);
  }

  to {
    transform: rotateX(0deg);
  }
}

/* ¤¤¤ Hlášky ¤¤¤ */

.cdNote {
  display: none;
  margin: 0;
  max-width: 34ch;
  font-size: clamp(1.5rem, 5.4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -.02em;
  background: linear-gradient(90deg, var(--a), var(--b));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.cd[data-state="expired"] #cdExpired {
  display: block;
}

.cdError {
  font-size: clamp(.95rem, 2.6vw, 1.15rem);
  font-weight: 500;
  max-width: 46ch;
  background: none;
  -webkit-background-clip: border-box;
  background-clip: border-box;
  color: var(--muted);
}

.cd[data-state="error"] #cdError {
  display: block;
}

.srOnly {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ¤¤¤ Úzké displeje ¤¤¤ */

/* Telefon na vysku: mrizka 2x2 pres celou sirku. */
@media (max-width: 560px) {
  .shell {
    padding-top: clamp(56px, 16vw, 76px);
  }

  .cd {
    gap: clamp(16px, 5vw, 26px);
  }

  .cdClock {
    grid-template-columns: repeat(2, 1fr);
    gap: clamp(10px, 3vw, 16px);
    width: 100%;
    max-width: 420px;
    --cardH: clamp(122px, 40vw, 168px);
    --digit: clamp(2.8rem, 15vw, 4.2rem);
  }

  .unitLabel {
    font-size: .68rem;
  }
}

/* Nizky viewport, typicky telefon na sirku. Odsazeni se tu nesmi pocitat
   z sirky (12vw by na sirku delalo pres 90 px), jinak obsah nevyjde na vysku. */
@media (max-height: 520px) and (orientation: landscape) {
  .shell {
    padding-top: max(16px, env(safe-area-inset-top, 0px));
    padding-bottom: max(12px, env(safe-area-inset-bottom, 0px));
  }

  .cd {
    gap: clamp(10px, 2.5vh, 18px);
  }

  .cdTitle {
    font-size: clamp(1rem, 4.5vh, 1.5rem);
  }

  .cdClock {
    grid-template-columns: repeat(4, 1fr);
    width: min(100%, 560px);
    gap: 10px;
    --cardH: clamp(70px, 30vh, 118px);
    --digit: clamp(1.9rem, 13vh, 3rem);
  }

  .unitLabel {
    font-size: .6rem;
    letter-spacing: .12em;
  }

  .cdNote {
    font-size: clamp(1.2rem, 7vh, 2rem);
  }
}

@media (prefers-reduced-motion: reduce) {

  .cdClock {
    transition: none;
  }

  .card.isFlipping .leaf {
    visibility: hidden;
    animation: none;
  }

  *,
  ::before,
  ::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
}

/* ¤¤¤ Stránka 404 ¤¤¤ */

.ptext {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(.95rem, 2.4vw, 1.08rem);
  line-height: 1.6;
  color: var(--muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  color: var(--text);
  font-size: .95rem;
  font-weight: 600;
  text-decoration: none;
  transition: border-color .2s ease, color .2s ease, transform .2s ease;
}

.btn:hover {
  border-color: color-mix(in srgb, var(--a) 55%, var(--line));
  color: var(--a);
}

.btn:active {
  transform: scale(.97);
}

.btn:focus-visible {
  outline: 2px solid var(--a);
  outline-offset: 3px;
}