:root {
  --bg: #070b12;
  --panel: rgba(10, 15, 24, 0.78);
  --panel-strong: rgba(9, 14, 22, 0.94);
  --text: #f4f8ff;
  --muted: #9bacbf;
  --accent: #2de16e;
  --border: rgba(255, 255, 255, 0.18);
  --danger: #ff8e8e;
  --header-h: clamp(3.5rem, 8vh, 4rem);
  --bottom-h: clamp(5rem, 12vh, 5.4rem);
  --panel-radius: 1rem;
  --gap: clamp(0.5rem, 1.8vw, 0.9rem);
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html,
body {
  width: 100%;
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  overflow: hidden;
  touch-action: manipulation;
}

.app-root {
  width: 100%;
  height: 100%;
  position: relative;
}

.camera-container {
  position: fixed;
  inset: 0;
  z-index: 0;
}

#video {
  display: none;
}

#canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  background: #000;
}

.panel {
  border: 1px solid var(--border);
  border-radius: var(--panel-radius);
  background: var(--panel);
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.34);
}

.app-header {
  position: fixed;
  top: clamp(0.4rem, 1.4vh, 0.7rem);
  left: clamp(0.45rem, 1.6vw, 1rem);
  right: clamp(0.45rem, 1.6vw, 1rem);
  min-height: var(--header-h);
  padding: 0.55rem 0.7rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--gap);
  z-index: 4;
}

.icon-button {
  min-width: 2.7rem;
  min-height: 2.7rem;
  border-radius: 0.72rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  font-size: 1.24rem;
  cursor: pointer;
}

.header-center {
  display: grid;
  gap: 0.2rem;
}

.label {
  margin: 0;
  font-size: clamp(0.62rem, 1.65vw, 0.75rem);
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.exercise-select {
  min-height: 2.35rem;
  width: 100%;
  border-radius: 0.68rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.09);
  color: var(--text);
  font-size: clamp(0.84rem, 1.9vw, 0.96rem);
  padding: 0.45rem 0.6rem;
}

.header-right {
  text-align: right;
  min-width: clamp(4rem, 13vw, 6rem);
}

.rep-value {
  margin: 0;
  line-height: 1;
  font-size: clamp(2rem, 7vw, 3.2rem);
  font-weight: 700;
  color: var(--accent);
}

.phase-text {
  margin: 0.05rem 0 0;
  font-size: clamp(0.7rem, 1.9vw, 0.88rem);
  color: var(--text);
}

.bottom-panel {
  position: fixed;
  left: clamp(0.45rem, 1.6vw, 1rem);
  right: clamp(0.45rem, 1.6vw, 1rem);
  bottom: clamp(0.45rem, 1.2vh, 0.9rem);
  height: clamp(16rem, 42vh, 25rem);
  transform: translateY(calc(100% - var(--bottom-h)));
  transition: transform 220ms ease;
  z-index: 4;
  padding: 0.55rem 0.7rem 0.8rem;
  display: grid;
  grid-template-rows: auto auto auto 1fr;
  gap: 0.52rem;
}

.bottom-panel.expanded {
  transform: translateY(0);
}

.panel-handle {
  width: clamp(2.7rem, 14vw, 3.4rem);
  height: 0.26rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.32);
  justify-self: center;
}

.primary-controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
}

.control-button {
  min-height: 44px;
  border-radius: 0.72rem;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  font-size: clamp(0.74rem, 1.8vw, 0.9rem);
  padding: 0.5rem 0.58rem;
  cursor: pointer;
}

.control-button:disabled {
  opacity: 0.62;
  cursor: not-allowed;
}

.status-row {
  min-height: 1.2rem;
}

.status-text {
  margin: 0;
  color: var(--muted);
  font-size: clamp(0.76rem, 1.8vw, 0.9rem);
}

.status-text.error {
  color: var(--danger);
}

.stats-accordion {
  overflow-y: auto;
  padding-right: 0.2rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
}

.stat-card {
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 0.74rem;
  background: rgba(255, 255, 255, 0.04);
  padding: 0.45rem 0.55rem;
}

.stat-value {
  margin: 0.12rem 0 0;
  font-size: clamp(1rem, 2.5vw, 1.34rem);
  font-weight: 600;
}

.history-block {
  margin-top: 0.64rem;
}

.history-list {
  margin: 0.35rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.34rem;
}

.history-list li {
  border-radius: 0.62rem;
  background: rgba(255, 255, 255, 0.05);
  padding: 0.34rem 0.45rem;
  font-size: clamp(0.72rem, 1.75vw, 0.84rem);
  color: #d9e7f6;
}

.history-empty {
  color: var(--muted);
}

.menu-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(2, 5, 10, 0.55);
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
  z-index: 5;
}

.menu-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.side-menu {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: min(70vw, 22rem);
  padding: clamp(0.9rem, 2.2vw, 1.4rem);
  background: var(--panel-strong);
  border-right: 1px solid rgba(255, 255, 255, 0.15);
  transform: translateX(-105%);
  transition: transform 200ms ease;
  z-index: 6;
  display: grid;
  align-content: start;
  gap: 0.7rem;
}

.side-menu.open {
  transform: translateX(0);
}

.menu-title {
  margin: 0;
  font-size: clamp(1rem, 2.5vw, 1.24rem);
}

.menu-nav {
  display: grid;
  gap: 0.45rem;
}

.menu-item {
  min-height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 0.72rem;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  font-size: clamp(0.84rem, 2vw, 0.96rem);
  text-align: left;
  padding: 0.52rem 0.62rem;
  cursor: pointer;
}

.control-button:hover,
.control-button:focus-visible,
.icon-button:hover,
.icon-button:focus-visible,
.menu-item:hover,
.menu-item:focus-visible,
.exercise-select:focus-visible {
  background: rgba(255, 255, 255, 0.16);
  outline: none;
}