/* =============================================
   PoseNet Practical 6 — Main Style
   Premium Light Theme
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@300;400;500;600&family=DM+Mono:wght@400;500&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #f5f4f0;
  --surface:   #ffffff;
  --surface2:  #f0eeea;
  --border:    #e4e2dc;
  --accent:    #2563eb;
  --accent2:   #7c3aed;
  --success:   #16a34a;
  --danger:    #dc2626;
  --text:      #18181b;
  --text2:     #71717a;
  --text3:     #a1a1aa;
  --shadow-sm: 0 1px 4px rgba(0,0,0,.06);
  --shadow:    0 4px 24px rgba(0,0,0,.08);
  --shadow-lg: 0 12px 48px rgba(0,0,0,.12);
  --radius:    16px;
  --radius-sm: 10px;
}

html, body {
  height: 100%;
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

/* ── Header ── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 64px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: .6rem;
}

.logo-icon {
  width: 34px;
  height: 34px;
  background: var(--accent);
  color: #fff;
  border-radius: 9px;
  display: grid;
  place-items: center;
  padding: 6px;
}

.logo-text {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -.01em;
}

.logo-text em { font-style: normal; color: var(--accent); }

.header-nav { display: flex; gap: .25rem; }

.nav-link {
  text-decoration: none;
  color: var(--text2);
  font-size: .875rem;
  font-weight: 500;
  padding: .4rem .85rem;
  border-radius: 8px;
  transition: background .15s, color .15s;
}

.nav-link:hover { background: var(--surface2); color: var(--text); }
.nav-link.active { background: var(--accent); color: #fff; }

/* ── Main Layout ── */
.main-content {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 1.5rem;
  padding: 1.5rem 2rem;
  max-width: 1280px;
  margin: 0 auto;
  min-height: calc(100vh - 64px);
}

/* ── Video Panel ── */
.video-panel {
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.video-container {
  position: relative;
  width: 100%;
  max-width: 680px;
  border-radius: var(--radius);
  overflow: hidden;
  background: #1a1a2e;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 4/3;
}

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

.video-container canvas { z-index: 2; }

.video-overlay {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  background: rgba(250,249,246,.92);
  backdrop-filter: blur(8px);
  color: var(--text2);
  font-size: .9rem;
  font-weight: 500;
  transition: opacity .4s;
}

.video-overlay.hidden { opacity: 0; pointer-events: none; }

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* corner decorations */
.corner {
  position: absolute;
  width: 20px;
  height: 20px;
  z-index: 3;
  pointer-events: none;
}
.corner.tl { top: 12px; left: 12px; border-top: 2px solid rgba(255,255,255,.6); border-left: 2px solid rgba(255,255,255,.6); border-radius: 4px 0 0 0; }
.corner.tr { top: 12px; right: 12px; border-top: 2px solid rgba(255,255,255,.6); border-right: 2px solid rgba(255,255,255,.6); border-radius: 0 4px 0 0; }
.corner.bl { bottom: 12px; left: 12px; border-bottom: 2px solid rgba(255,255,255,.6); border-left: 2px solid rgba(255,255,255,.6); border-radius: 0 0 0 4px; }
.corner.br { bottom: 12px; right: 12px; border-bottom: 2px solid rgba(255,255,255,.6); border-right: 2px solid rgba(255,255,255,.6); border-radius: 0 0 4px 0; }

/* ── Control Panel ── */
.control-panel {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .9rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: .25rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow .2s;
}

.stat-card:hover { box-shadow: var(--shadow); }

.stat-card.primary { border-left: 3px solid var(--accent); }

.stat-label {
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--text3);
}

.stat-value {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
}

.stat-value.mono { font-family: 'DM Mono', monospace; }

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .65rem;
}

/* ── Controls ── */
.control-group {
  display: flex;
  flex-direction: column;
  gap: .6rem;
}

.control-label {
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--text2);
}

.slider-row {
  display: flex;
  align-items: center;
  gap: .75rem;
}

input[type=range] {
  flex: 1;
  -webkit-appearance: none;
  height: 5px;
  background: var(--border);
  border-radius: 99px;
  outline: none;
}

input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 0 3px rgba(37,99,235,.15);
  transition: box-shadow .2s;
}

input[type=range]::-webkit-slider-thumb:hover {
  box-shadow: 0 0 0 5px rgba(37,99,235,.2);
}

.slider-val {
  font-family: 'DM Mono', monospace;
  font-size: .82rem;
  font-weight: 500;
  color: var(--accent);
  min-width: 28px;
  text-align: right;
}

.btn {
  width: 100%;
  padding: .7rem 1rem;
  border: none;
  border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .18s;
  letter-spacing: -.01em;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover { background: #1d4ed8; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(37,99,235,.3); }
.btn-primary:active { transform: translateY(0); }

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
}

.btn-outline:hover { background: var(--surface2); border-color: var(--text3); }

/* ── Keypoints List ── */
.keypoints-list {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  box-shadow: var(--shadow-sm);
  flex: 1;
  overflow-y: auto;
  max-height: 340px;
}

.list-title {
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--text2);
  margin-bottom: .75rem;
}

.kp-grid {
  display: flex;
  flex-direction: column;
  gap: .35rem;
}

.kp-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .78rem;
  padding: .3rem .5rem;
  border-radius: 6px;
  background: var(--surface2);
}

.kp-name { color: var(--text2); font-weight: 500; }
.kp-score { font-family: 'DM Mono', monospace; font-weight: 600; }
.kp-score.high { color: var(--success); }
.kp-score.med  { color: #d97706; }
.kp-score.low  { color: var(--danger); }

/* ── Responsive ── */
@media (max-width: 900px) {
  .main-content { grid-template-columns: 1fr; }
  .control-panel { display: grid; grid-template-columns: 1fr 1fr; }
  .keypoints-list { grid-column: 1 / -1; }
}

@media (max-width: 560px) {
  .app-header { padding: 0 1rem; }
  .main-content { padding: 1rem; gap: 1rem; }
  .control-panel { grid-template-columns: 1fr; }
  .header-nav .nav-link { font-size: .78rem; padding: .35rem .6rem; }
}