/* =============================================================
   FitAI – Complete Stylesheet
   Dark neon fitness theme
   ============================================================= */

/* ---- CSS Custom Properties ---- */
:root {
  --bg-primary:    #0a0a0f;
  --bg-card:       #111118;
  --bg-card-hover: #16161f;
  --bg-glass:      rgba(17, 17, 24, 0.85);

  --accent-green:  #00ff88;
  --accent-green2: #00cc6a;
  --accent-purple: #7c3aed;
  --accent-purple2:#9d5ff5;
  --accent-yellow: #ffd600;
  --accent-red:    #ff4444;
  --accent-orange: #ff8c00;

  --text-primary:  #f0f0f0;
  --text-secondary:#a0a0b0;
  --text-muted:    #606070;

  --border-color:  rgba(255, 255, 255, 0.08);
  --border-accent: rgba(0, 255, 136, 0.3);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow-green: 0 0 20px rgba(0, 255, 136, 0.35);
  --shadow-glow-purple: 0 0 20px rgba(124, 58, 237, 0.4);

  --transition-fast: 0.15s ease;
  --transition-med:  0.3s ease;
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent-purple); border-radius: 99px; }

/* ==============================================================
   HEADER
   ============================================================== */
.app-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 58px;
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 100;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: default;
  user-select: none;
}

.logo-icon { font-size: 22px; }

.logo-text {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--accent-green), var(--accent-purple2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-nav { display: flex; gap: 8px; }

/* ==============================================================
   MAIN / SCREENS
   ============================================================== */
.app-main {
  margin-top: 58px;
  flex: 1;
  position: relative;
  min-height: calc(100vh - 58px);
}

.screen {
  display: none;
  min-height: calc(100vh - 58px);
  padding: 28px 20px;
}

.screen.active {
  display: block;
  animation: screenIn 0.3s ease forwards;
}

@keyframes screenIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ==============================================================
   BUTTONS
   ============================================================== */
button { cursor: pointer; border: none; font-family: inherit; transition: var(--transition-fast); outline: none; }
button:focus-visible { outline: 2px solid var(--accent-green); outline-offset: 2px; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent-green), var(--accent-green2));
  color: #000;
  font-weight: 700;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: 15px;
  box-shadow: var(--shadow-glow-green);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 32px rgba(0, 255, 136, 0.5); }
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled { opacity: 0.45; cursor: not-allowed; transform: none; box-shadow: none; }

.btn-xl { padding: 16px 40px; font-size: 17px; border-radius: var(--radius-lg); }

.btn-secondary {
  background: transparent;
  border: 1.5px solid var(--border-accent);
  color: var(--accent-green);
  font-weight: 600;
  padding: 11px 24px;
  border-radius: var(--radius-md);
  font-size: 14px;
}
.btn-secondary:hover { background: rgba(0, 255, 136, 0.08); border-color: var(--accent-green); }
.btn-secondary:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-accent {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-purple2));
  color: #fff;
  font-weight: 700;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: 15px;
  box-shadow: var(--shadow-glow-purple);
}
.btn-accent:hover { transform: translateY(-2px); box-shadow: 0 0 32px rgba(124, 58, 237, 0.55); }
.btn-accent:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

.btn-danger {
  background: linear-gradient(135deg, #c0392b, #e74c3c);
  color: #fff;
  font-weight: 700;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: 15px;
}
.btn-danger:hover { transform: translateY(-2px); box-shadow: 0 0 20px rgba(231, 76, 60, 0.4); }

.btn-sm { padding: 9px 18px; font-size: 13px; }

.btn-icon {
  background: transparent;
  color: var(--text-secondary);
  padding: 8px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.btn-icon:hover { background: rgba(255,255,255,0.07); color: var(--text-primary); }

.btn-icon-inner { font-size: 13px; }

/* ==============================================================
   SCREEN: HOME
   ============================================================== */
#screen-home { max-width: 900px; margin: 0 auto; }

.hero {
  text-align: center;
  padding: 40px 20px 32px;
}

.hero-badge {
  display: inline-block;
  background: rgba(124, 58, 237, 0.2);
  border: 1px solid rgba(124, 58, 237, 0.4);
  color: var(--accent-purple2);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 99px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 16px;
}

.accent-green { color: var(--accent-green); }

.hero-subtitle {
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.6;
  max-width: 480px;
  margin: 0 auto 32px;
}

.hero .btn-primary { margin-bottom: 14px; display: block; width: fit-content; margin-left: auto; margin-right: auto; }
.hero .btn-secondary { display: block; width: fit-content; margin: 0 auto; }

/* Quick Stats */
.quick-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 32px 0;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 12px;
  text-align: center;
  transition: var(--transition-med);
}
.stat-card:hover { border-color: var(--border-accent); transform: translateY(-2px); }

.stat-value {
  display: block;
  font-size: 26px;
  font-weight: 800;
  color: var(--accent-green);
  line-height: 1.1;
}

.stat-label {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-top: 4px;
}

/* Exercise Preview */
.exercise-preview { margin-top: 20px; }

.section-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.exercise-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.exercise-chip {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 99px;
  padding: 7px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition-fast);
}
.exercise-chip:hover { border-color: var(--border-accent); color: var(--accent-green); }
.exercise-chip--custom {
  border-color: rgba(124, 58, 237, 0.4);
  color: var(--accent-purple2);
  cursor: pointer;
}
.exercise-chip--custom:hover { background: rgba(124, 58, 237, 0.1); }

/* ==============================================================
   WORKOUT & RECORD LAYOUT
   ============================================================== */
.workout-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 20px;
  max-width: 1100px;
  margin: 0 auto;
  align-items: start;
}

/* Camera Container */
.camera-container {
  position: relative;
  background: #000;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4/3;
  border: 1px solid var(--border-color);
  min-height: 360px;
}

.camera-container video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.camera-container canvas {
  position: absolute;
  inset: 0;
  width: 100% !important;
  height: 100% !important;
  object-fit: cover;
}

.camera-overlay-text {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0,0,0,0.65);
  color: var(--text-secondary);
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 99px;
  pointer-events: none;
  white-space: nowrap;
}

.landmark-info {
  position: absolute;
  top: 10px;
  right: 12px;
  background: rgba(0,0,0,0.55);
  color: var(--text-muted);
  font-size: 10px;
  padding: 3px 8px;
  border-radius: 99px;
}

/* Countdown overlay */
.countdown-display {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.5);
  font-size: 96px;
  font-weight: 900;
  color: var(--accent-green);
  text-shadow: var(--shadow-glow-green);
  z-index: 10;
}
/* Class added/removed by JS to re-trigger animation each second */
.countdown-display.countdown-animate {
  animation: countdownPulse 0.9s ease-in-out forwards;
}
@keyframes countdownPulse {
  0%   { transform: scale(1.5); opacity: 0; }
  30%  { transform: scale(1.0); opacity: 1; }
  75%  { transform: scale(1.0); opacity: 1; }
  100% { transform: scale(0.75); opacity: 0; }
}

/* ==============================================================
   WORKOUT PANEL
   ============================================================== */
.workout-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.panel-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent-green);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 12px;
}

.panel-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.exercise-label, .rep-label, .quality-label, .score-label, .feedback-label {
  display: block;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.exercise-name {
  display: block;
  font-size: 18px;
  font-weight: 700;
  color: var(--accent-green);
  min-height: 28px;
}

.timer-display {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  font-family: 'Courier New', monospace;
}

/* Rep counter */
.rep-section { text-align: center; }

.rep-count {
  display: block;
  font-size: 80px;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1;
  transition: transform 0.15s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.rep-count.bump {
  transform: scale(1.25);
  color: var(--accent-green);
}

/* Quality bar */
.quality-header { display: flex; justify-content: space-between; align-items: center; }
.quality-value { font-size: 14px; font-weight: 600; color: var(--text-primary); }

.quality-bar-track {
  height: 10px;
  background: rgba(255,255,255,0.08);
  border-radius: 99px;
  overflow: hidden;
  margin-top: 8px;
}

.quality-bar-fill {
  height: 100%;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--accent-red), var(--accent-yellow), var(--accent-green));
  background-size: 300% 100%;
  background-position: right center;
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1), background-position 0.5s;
}

/* Score */
.score-section {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(0, 255, 136, 0.05);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-md);
  padding: 12px 16px;
}

.score-value {
  font-size: 28px;
  font-weight: 800;
  color: var(--accent-green);
}

/* Feedback */
.feedback-section {
  flex: 1;
  min-height: 80px;
}

.feedback-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 6px;
}

.feedback-item {
  font-size: 13px;
  color: var(--text-secondary);
  padding: 6px 10px;
  background: rgba(255,255,255,0.04);
  border-left: 2px solid var(--accent-green);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.feedback-item.warning { border-left-color: var(--accent-yellow); color: var(--accent-yellow); }
.feedback-item.error   { border-left-color: var(--accent-red);    color: var(--accent-red); }
.feedback-item.good    { border-left-color: var(--accent-green);  color: var(--accent-green); }

/* Workout actions */
.workout-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ==============================================================
   SCREEN: RECORD (extras)
   ============================================================== */
.record-panel { justify-content: flex-start; }

.input-group { display: flex; flex-direction: column; gap: 6px; }
.input-label { font-size: 12px; color: var(--text-secondary); font-weight: 500; }
.input-field {
  background: rgba(255,255,255,0.05);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 15px;
  font-family: inherit;
  padding: 10px 14px;
  transition: border-color var(--transition-fast);
}
.input-field:focus { outline: none; border-color: var(--accent-green); background: rgba(0, 255, 136, 0.04); }
.input-field::placeholder { color: var(--text-muted); }

.record-instructions {
  background: rgba(124, 58, 237, 0.08);
  border: 1px solid rgba(124, 58, 237, 0.25);
  border-radius: var(--radius-md);
  padding: 16px;
}
.instructions-title { font-size: 13px; color: var(--accent-purple2); margin-bottom: 10px; font-weight: 600; }
.instructions-list { padding-left: 18px; }
.instructions-list li { font-size: 13px; color: var(--text-secondary); margin-bottom: 6px; line-height: 1.5; }
.instructions-list strong { color: var(--text-primary); }

.recording-status {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: rgba(255, 68, 68, 0.1);
  border: 1px solid rgba(255, 68, 68, 0.3);
  border-radius: var(--radius-md);
}
.recording-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--accent-red);
  animation: recordPulse 1s ease-in-out infinite;
  flex-shrink: 0;
}
@keyframes recordPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.7); }
}
#recording-status-text { font-size: 13px; color: var(--accent-red); font-weight: 600; flex: 1; }
.recording-frames { font-size: 11px; color: var(--text-muted); }

.record-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
}

/* ==============================================================
   SCREEN: REPORT
   ============================================================== */
#screen-report { padding-bottom: 48px; }

.report-container {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.report-header { text-align: center; }
.report-title { font-size: 28px; font-weight: 900; }
.report-date { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

/* Score Circle */
.score-circle-wrapper {
  position: relative;
  width: 160px;
  height: 160px;
  margin: 0 auto;
}

.score-circle-svg { transform: rotate(-90deg); }

.score-circle-bg {
  fill: none;
  stroke: rgba(255,255,255,0.06);
  stroke-width: 10;
}

.score-circle-fill {
  fill: none;
  stroke: url(#scoreGradient);
  stroke-width: 10;
  stroke-linecap: round;
  transition: stroke-dashoffset 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Inline gradient for SVG */
.score-circle-svg defs { display: none; }

.score-circle-content {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.score-circle-value {
  font-size: 38px;
  font-weight: 900;
  color: var(--accent-green);
  line-height: 1;
}

.score-circle-label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Summary card */
.report-summary-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}
.report-summary-text { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* Stats row */
.report-stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.report-stat {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
}
.report-stat-value {
  display: block;
  font-size: 28px;
  font-weight: 800;
  color: var(--accent-green);
}
.report-stat-label {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-top: 4px;
}

/* Achievement */
.achievement-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.15), rgba(0, 255, 136, 0.08));
  border: 1px solid rgba(124, 58, 237, 0.4);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  animation: achievementSlide 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}
@keyframes achievementSlide {
  from { opacity: 0; transform: scale(0.85) translateY(16px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}
.achievement-icon { font-size: 40px; }
.achievement-title { font-size: 16px; font-weight: 700; color: var(--accent-yellow); }
.achievement-desc { font-size: 13px; color: var(--text-secondary); margin-top: 4px; }

/* Report section */
.report-section {}

/* Exercise breakdown */
.exercise-breakdown {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.exercise-row {
  display: grid;
  grid-template-columns: 1fr 60px 90px 80px 90px;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  transition: var(--transition-fast);
}
.exercise-row:hover { border-color: var(--border-accent); }

.exercise-row-name { font-weight: 600; font-size: 14px; }
.exercise-row-reps { color: var(--text-secondary); font-size: 13px; text-align: center; }
.exercise-row-reps strong { color: var(--text-primary); display: block; font-size: 16px; }
.exercise-row-quality { font-size: 13px; text-align: center; }
.exercise-row-quality strong { display: block; font-size: 15px; }
.exercise-row-score { font-size: 13px; text-align: center; color: var(--accent-green); font-weight: 700; }
.exercise-row-status {
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 99px;
  text-align: center;
  white-space: nowrap;
}
.status-excelente { background: rgba(0, 255, 136, 0.15); color: var(--accent-green); border: 1px solid rgba(0,255,136,0.3); }
.status-bom       { background: rgba(255, 214, 0, 0.12); color: var(--accent-yellow); border: 1px solid rgba(255,214,0,0.3); }
.status-melhorar  { background: rgba(255, 68, 68, 0.12); color: var(--accent-red); border: 1px solid rgba(255,68,68,0.3); }

/* Tips list */
.tips-list, .strengths-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  list-style: none;
}

.tips-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--accent-yellow);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 10px 14px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}
.tips-list li::before { content: '💡'; flex-shrink: 0; }

.strengths-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  background: rgba(0, 255, 136, 0.05);
  border: 1px solid rgba(0, 255, 136, 0.15);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 13px;
  color: var(--text-secondary);
}
.strengths-list li::before { content: '✅'; flex-shrink: 0; }

/* Next workout card */
.next-workout-card {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.12), rgba(0, 255, 136, 0.06));
  border: 1px solid rgba(124, 58, 237, 0.3);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}
.next-workout-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-purple2);
  margin-bottom: 8px;
  font-weight: 600;
}
.next-workout-text { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* Report actions */
.report-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ==============================================================
   SCREEN: HISTORY
   ============================================================== */
#screen-history { padding-bottom: 48px; }

.history-container { max-width: 720px; margin: 0 auto; }

.history-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}
.history-title { font-size: 24px; font-weight: 800; }
.back-btn { color: var(--text-secondary); }

.history-loading {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 32px;
  justify-content: center;
  color: var(--text-muted);
}

.history-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}
.empty-icon { font-size: 48px; margin-bottom: 12px; }
.history-empty p { margin-bottom: 20px; font-size: 15px; }

.history-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.history-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 16px;
  align-items: center;
  transition: var(--transition-fast);
  cursor: default;
}
.history-card:hover { border-color: var(--border-accent); background: var(--bg-card-hover); }

.history-card-date { font-size: 12px; color: var(--text-muted); grid-column: 1 / -1; }
.history-card-exercises { font-size: 14px; font-weight: 600; color: var(--text-primary); }
.history-card-meta { font-size: 12px; color: var(--text-secondary); }
.history-card-score {
  font-size: 22px;
  font-weight: 800;
  color: var(--accent-green);
  text-align: right;
  grid-row: 2 / 4;
}
.history-card-score small { font-size: 11px; color: var(--text-muted); font-weight: 400; display: block; text-align: right; }

/* ==============================================================
   SPINNER
   ============================================================== */
.spinner {
  width: 28px; height: 28px;
  border: 3px solid rgba(255,255,255,0.1);
  border-top-color: var(--accent-green);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ==============================================================
   TOAST
   ============================================================== */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--bg-card);
  border: 1px solid var(--border-accent);
  color: var(--text-primary);
  padding: 12px 24px;
  border-radius: 99px;
  font-size: 14px;
  font-weight: 500;
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-med), transform var(--transition-med);
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
  white-space: nowrap;
  max-width: 90vw;
  overflow: hidden;
  text-overflow: ellipsis;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.toast.success { border-color: rgba(0,255,136,0.5); color: var(--accent-green); }
.toast.error   { border-color: rgba(255,68,68,0.5);  color: var(--accent-red); }
.toast.info    { border-color: rgba(124,58,237,0.5); color: var(--accent-purple2); }

/* ==============================================================
   RESPONSIVE
   ============================================================== */
@media (max-width: 820px) {
  .workout-layout {
    grid-template-columns: 1fr;
  }

  .camera-container {
    aspect-ratio: 4/3;
    max-height: 50vw;
  }

  .quick-stats { grid-template-columns: repeat(2, 1fr); }

  .exercise-row {
    grid-template-columns: 1fr 50px 70px;
  }
  .exercise-row-score, .exercise-row-status { display: none; }

  .report-stats-row { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 520px) {
  .screen { padding: 16px 12px; }

  .hero { padding: 24px 12px 20px; }

  .rep-count { font-size: 64px; }

  .workout-panel { padding: 14px; gap: 14px; }

  .exercise-row { grid-template-columns: 1fr 50px; }
  .exercise-row-quality { display: none; }

  .report-stats-row { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .report-stat { padding: 12px 8px; }
  .report-stat-value { font-size: 22px; }
}

/* ==============================================================
   UTILITY
   ============================================================== */
.hidden { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }