* {
  box-sizing: border-box;
}

:root {
  --orange: #ff9a08;
  --navy: #1e2354;
  --blue: rgba(10, 85, 209, 0.8);
  --blue-dark: #06378a;
  --yellow: #eeff10;
  --square: #ebaf1b;
  --black: #000000;
  --white: #ffffff;
  --instrument-color: var(--square);
  --page-image: none;
}

/* ШРИФТЫ */
@font-face {
  font-family: "Pricedown";
  src: url("fonts/Pricedown.ttf") format("truetype");
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Gamestation";
  src: url("fonts/Gamestation.ttf") format("truetype");
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

/* ОСНОВНАЯ СТРАНИЦА */
html,
body {
  margin: 0;
  min-height: 100%;
}
body {
  position: relative;
  min-height: 100vh;
  padding: 25px 32px 50px;
  overflow-x: hidden;
  color: var(--black);
  background-image: url("images/VHS.jpg");
  background-position: center;
  background-size: cover;
  background-attachment: fixed;
  font-family: "Gamestation", Arial, sans-serif;
}
button,
input {
  font: inherit;
}

/* ЭФФЕКТ ШУМА */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1000;
  pointer-events: none;
  opacity: 0.1;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.6'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
}

/* ОСНОВНАЯ РАБОЧАЯ ОБЛАСТЬ */
.stage {
  position: relative;
  isolation: isolate;
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0;
  overflow: visible;
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
}

/* ШАПКА: ЛОГОТИП + КНОПКА */
.master-panel {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  flex-wrap: nowrap;
  gap: 0;
  width: fit-content;
  max-width: 100%;
  padding: 0;
  margin: 0 0 23px;
  background: transparent;
  border: none;
  border-radius: 0;
}

/* ЛОГОТИП */
.section-heading {
  position: relative;
  z-index: 1;
  display: block;
  align-self: flex-start;
  width: fit-content;
  max-width: 100%;
  margin: 0;
  padding: 10px 18px 12px;
  background: var(--navy);
  border: 9px solid var(--yellow);
  border-radius: 13px;
  box-shadow: none;
}
.section-heading h2 {
  margin: 0;
  color: var(--yellow);
  font-family: "Pricedown", Impact, sans-serif;
  font-size: clamp(38px, 6vw, 76px);
  font-weight: normal;
  line-height: 0.95;
  letter-spacing: 0;
  text-transform: uppercase;
}
.section-heading p {
  display: none;
}

/* КНОПКА ПОД ЛОГОТИПОМ */
.start-button {
  position: relative;
  z-index: 2;
  align-self: flex-end;
  min-height: 36px;
  min-width: 0;
  margin-top: -8px;
  margin-right: 0;
  padding: 10px 18px;
  color: var(--navy);
  background: var(--yellow);
  border: none;
  border-radius: 0 0 12px 12px;
  font-family: "Gamestation", Arial, sans-serif;
  font-size: 13px;
  font-weight: normal;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    filter 0.2s ease,
    transform 0.2s ease;
}
.start-button:hover {
  filter: brightness(1.08);
}
.start-button:active {
  transform: translateY(2px);
}
.start-button:disabled {
  opacity: 0.65;
  cursor: wait;
}
.start-button.is-active {
  background: var(--yellow);
  color: var(--navy);
}

/* ДОПОЛНИТЕЛЬНЫЕ ЭЛЕМЕНТЫ ПАНЕЛИ */
.master-volume-control,
.audio-status {
  display: none;
}

/* СЕТКА ИНСТРУМЕНТОВ */
.instruments-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 23px 21px;
  width: 100%;
  max-width: 935px;
  margin: 0 auto;
}

/* КАРТОЧКИ ИНСТРУМЕНТОВ */
.instrument-card {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 0;
  min-height: 380px;
  padding: 16px 44px 24px;
  background: linear-gradient(
    135deg,
    rgba(10, 85, 209, 0.83),
    rgba(30, 65, 155, 0.78)
  );
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 5px;
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  box-shadow:
    inset 0 1px 1px rgba(255, 255, 255, 0.12),
    inset 0 -1px 2px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

/* КВАДРАТЫ ИНСТРУМЕНТОВ */
.square-object {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 175px;
  aspect-ratio: 1 / 1;
  flex-shrink: 0;
  margin: 0 auto 14px;
  padding: 12px;
  overflow: hidden;
  color: var(--black);
  background-color: var(--square);
  background-image: var(--instrument-image, none);
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  border: none;
  border-radius: 0;
  cursor: pointer;
  box-shadow:
    5px 5px 4px rgba(255, 255, 255, 0.65),
    7px 7px 5px rgba(0, 0, 0, 0.16);
  transition:
    transform 0.18s ease,
    filter 0.18s ease,
    box-shadow 0.18s ease;
}
.square-object::before,
.square-object::after {
  content: none;
}

/* СИМВОЛЫ ВНУТРИ КВАДРАТА */
.square-number {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 2;
  font-size: 10px;
}
.square-symbol {
  position: relative;
  z-index: 2;
  color: var(--black);
  font-family: "Pricedown", Impact, sans-serif;
  font-size: clamp(28px, 3vw, 38px);
  font-weight: normal;
  line-height: 1;
}
.square-name {
  position: relative;
  z-index: 2;
  margin-top: 5px;
  font-family: "Gamestation", Arial, sans-serif;
  font-size: 11px;
  font-weight: normal;
  letter-spacing: 1px;
}

/* СОСТОЯНИЯ ИНСТРУМЕНТОВ */
.square-object:hover {
  filter: brightness(1.06);
  transform: translateY(-2px);
}
.square-object.is-active {
  filter: brightness(1.12);
  transform: scale(0.97);
  box-shadow:
    0 0 0 4px var(--yellow),
    5px 5px 4px rgba(255, 255, 255, 0.55);
}

/* ЦВЕТА ИНСТРУМЕНТОВ */
.kick-card,
.bass-card,
.synth-card,
.clap-card,
.hat-card,
.pluck-card {
  --instrument-color: var(--square);
}

/* РЕГУЛЯТОРЫ */
.instrument-controls {
  display: grid;
  gap: 12px;
  width: 100%;
  margin-top: auto;
}
.instrument-controls label {
  display: grid;
  gap: 6px;
  min-width: 0;
  color: var(--yellow);
  font-family: "Gamestation", Arial, sans-serif;
  font-size: 11px;
  font-weight: normal;
  letter-spacing: 0;
}
.instrument-controls label span {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 5px;
}
.instrument-controls output {
  color: var(--yellow);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

/* ПОЛЗУНКИ */
.instrument-controls input[type="range"] {
  display: block;
  width: 100%;
  height: 20px;
  margin: 0;
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  cursor: pointer;
}
.instrument-controls input[type="range"]::-webkit-slider-runnable-track {
  height: 5px;
  background: var(--blue-dark);
  border: none;
  border-radius: 0;
}
.instrument-controls input[type="range"]::-moz-range-track {
  height: 5px;
  background: var(--blue-dark);
  border: none;
  border-radius: 0;
}
.instrument-controls input[type="range"]::-webkit-slider-thumb {
  width: 17px;
  height: 25px;
  margin-top: -10px;
  appearance: none;
  -webkit-appearance: none;
  background: var(--yellow);
  border: none;
  border-radius: 0;
  box-shadow: 2px 2px 2px rgba(0, 0, 0, 0.25);
}
.instrument-controls input[type="range"]::-moz-range-thumb {
  width: 17px;
  height: 25px;
  background: var(--yellow);
  border: none;
  border-radius: 0;
  box-shadow: 2px 2px 2px rgba(0, 0, 0, 0.25);
}

/* ЦВЕТА РЕГУЛЯТОРОВ */
.kick-card input[type="range"],
.bass-card input[type="range"],
.synth-card input[type="range"],
.clap-card input[type="range"],
.hat-card input[type="range"],
.pluck-card input[type="range"] {
  accent-color: var(--yellow);
}

/* ПОДВАЛ */
.footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 30px;
  padding-top: 16px;
  border-top: 1px solid rgba(30, 35, 84, 0.3);
  color: var(--navy);
  font-size: 10px;
  letter-spacing: 1px;
}

/* ФОКУС С КЛАВИАТУРЫ */
button:focus-visible,
input:focus-visible,
.square-object:focus-visible {
  outline: 3px solid var(--yellow);
  outline-offset: 4px;
}

/* ПЛАНШЕТЫ */
@media (max-width: 900px) {
  body {
    padding: 20px;
  }
  .stage {
    max-width: 760px;
  }
  .instruments-grid {
    gap: 16px;
  }
  .instrument-card {
    min-height: 330px;
    padding: 14px 24px 20px;
  }
  .square-object {
    max-width: 150px;
  }
}

/* ТЕЛЕФОНЫ */
@media (max-width: 600px) {
  body {
    padding: 16px 12px 30px;
  }
  .master-panel {
    margin-bottom: 20px;
  }
  .section-heading {
    border-width: 6px;
    padding: 9px 12px;
  }
  .section-heading h2 {
    font-size: clamp(32px, 10vw, 52px);
  }
  .instruments-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }
  .instrument-card {
    min-height: 290px;
    padding: 12px 12px 16px;
  }
  .square-object {
    max-width: 135px;
  }
  .instrument-controls {
    gap: 10px;
  }
  .instrument-controls label {
    font-size: 9px;
  }
}

/* МАЛЕНЬКИЕ ТЕЛЕФОНЫ */
@media (max-width: 360px) {
  .instruments-grid {
    grid-template-columns: 1fr;
  }
  .instrument-card {
    min-height: 320px;
    padding: 16px 30px 20px;
  }
  .square-object {
    max-width: 160px;
  }
}

/* УМЕНЬШЕНИЕ АНИМАЦИЙ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto;
    transition-duration: 0.01ms;
    animation-duration: 0.01ms;
    animation-iteration-count: 1;
  }
}