/* =============================================================
   VOLLEYBALL ROTATION SYSTEM — SHARED GLASSMORPHISM TOKENS
   Used by: glassmorphism-sample.html, editor-glassmorphism-sample.html
   ============================================================= */

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

:root {
  /* Glass */
  --glass-bg: rgba(255, 255, 255, 0.07);
  --glass-bg-hover: rgba(255, 255, 255, 0.12);
  --glass-bg-active: rgba(255, 255, 255, 0.18);
  --glass-border: rgba(255, 255, 255, 0.13);
  --glass-border-hover: rgba(255, 255, 255, 0.25);
  --glass-border-active: rgba(255, 255, 255, 0.3);
  --glass-blur: 16px;
  --glass-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
  --glass-inset-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.08);

  /* Accent */
  --accent: #5eaeff;
  --accent-bg: rgba(94, 174, 255, 0.18);
  --accent-border: rgba(94, 174, 255, 0.4);
  --accent-glow: 0 0 16px rgba(94, 174, 255, 0.15);

  /* Success (completion state) */
  --success: #2ecc71;
  --success-bg: rgba(46, 204, 113, 0.18);
  --success-border: rgba(46, 204, 113, 0.4);
  --success-glow: 0 0 16px rgba(46, 204, 113, 0.15);

  /* Danger */
  --danger: #e74c3c;
  --danger-bg: rgba(231, 76, 60, 0.18);
  --danger-border: rgba(231, 76, 60, 0.4);

  /* Court / Player colours */
  --player-color: #efa581;
  --highlight-color: #f1c40f;
  --libero-color: #e74c3c;

  /* Text */
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.6);
  --text-muted: rgba(255, 255, 255, 0.3);
}

html, body { height: 100%; height: 100dvh; overflow: hidden; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text-primary);
  background:
    radial-gradient(ellipse at 15% 30%, rgba(94, 174, 255, 0.2) 0%, transparent 50%),
    radial-gradient(ellipse at 85% 15%, rgba(232, 132, 74, 0.15) 0%, transparent 45%),
    radial-gradient(ellipse at 50% 85%, rgba(74, 144, 164, 0.18) 0%, transparent 50%),
    radial-gradient(ellipse at 75% 60%, rgba(46, 204, 113, 0.08) 0%, transparent 40%),
    linear-gradient(135deg, #0c1520 0%, #162030 35%, #1a2840 65%, #0f1a28 100%);
  background-attachment: fixed;
}

/* ============================
   Glass Panel Base
   ============================ */
.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow), var(--glass-inset-highlight);
  border-radius: 14px;
}

/* ============================
   App Navigation Shell
   ============================ */
.app-nav {
  position: sticky;
  top: 0;
  z-index: 200;
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.12);
}

.app-nav-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 8px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.app-nav-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.3px;
}

.app-nav-hamburger {
  width: 36px;
  height: 36px;
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--text-primary);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  position: relative;
}

.app-nav-hamburger:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
}

.app-nav-hamburger.open {
  background: var(--glass-bg-active);
  border-color: var(--glass-border-active);
}

/* Dropdown menu */
.app-nav-menu {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 200px;
  background: rgba(10, 18, 28, 0.98);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--glass-border);
  border-radius: 14px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  padding: 6px;
  z-index: 300;
}

.app-nav-menu.open {
  display: block;
  animation: menu-fade-in 0.15s ease;
}

@keyframes menu-fade-in {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.nav-menu-item {
  display: block;
  padding: 10px 14px;
  border-radius: 10px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.15s ease;
  cursor: pointer;
}

.nav-menu-item:hover {
  background: var(--glass-bg-hover);
  color: var(--text-primary);
}

.nav-menu-item.active {
  background: var(--accent-bg);
  border: 1px solid var(--accent-border);
  color: var(--accent);
}

.nav-menu-sep {
  height: 1px;
  background: var(--glass-border);
  margin: 4px 6px;
}

.nav-coffee {
  color: rgba(255, 200, 120, 0.8);
}

.nav-coffee:hover {
  color: rgba(255, 200, 120, 1);
}

/* Desktop nav tabs */
.app-nav-tabs { display: none; }

@media (min-width: 768px) {
  .app-nav-tabs {
    display: flex;
    gap: 4px;
    margin-left: 24px;
    flex: 1;
  }
  .nav-tab {
    padding: 8px 14px;
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-decoration: none;
    transition: background 0.15s ease, color 0.15s ease;
  }
  .nav-tab:hover { background: var(--glass-bg-hover); color: var(--text-primary); }
  .nav-tab.active {
    background: var(--accent-bg);
    color: var(--accent);
    border: 1px solid var(--accent-border);
  }
  /* Hide the internal duplicates inside the hamburger on desktop */
  .nav-menu-internal { display: none; }
}

/* ============================
   Toggle Group (Switchable Buttons)
   — Serving/Receiving (viewer)
   — Court/Players/Config (editor)
   ============================ */
.toggle-group {
  display: flex;
  gap: 4px;
  border-radius: 14px;
  padding: 4px;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.toggle-btn {
  flex: 1;
  padding: 11px 8px;
  font-size: 0.9rem;
  font-weight: 600;
  border: 1px solid transparent;
  border-radius: 11px;
  cursor: pointer;
  transition: all 0.25s ease;
  background: transparent;
  color: var(--text-secondary);
  letter-spacing: 0.3px;
}

.toggle-btn.active {
  background: var(--glass-bg-active);
  border-color: var(--glass-border-active);
  color: var(--text-primary);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.toggle-btn:not(.active):hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

/* ============================
   Zone Buttons (Setter 1–6 grid)
   ============================ */
.zone-btn {
  padding: 10px 6px;
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 700;
  min-width: 36px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.zone-btn:hover {
  color: var(--text-primary);
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-active);
}

.zone-btn.active {
  background: var(--accent-bg);
  border-color: var(--accent-border);
  color: var(--accent);
  box-shadow: var(--accent-glow);
}

.zone-btn.complete {
  background: var(--success-bg);
  border-color: var(--success-border);
  color: var(--success);
  box-shadow: var(--success-glow);
}

.zone-btn.complete.active {
  border-color: var(--accent-border);
  box-shadow: var(--accent-glow);
}

/* ============================
   Phase Buttons (Base/Serve/Attack)
   ============================ */
.phase-btn {
  padding: 9px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--text-secondary);
  letter-spacing: 0.3px;
}

.phase-btn.active {
  background: var(--accent-bg);
  border-color: var(--accent-border);
  color: var(--accent);
  box-shadow: var(--accent-glow);
}

.phase-btn.complete {
  background: var(--success-bg);
  border-color: var(--success-border);
  color: var(--success);
  box-shadow: var(--success-glow);
}

.phase-btn.complete.active {
  background: linear-gradient(135deg, var(--success-bg), var(--accent-bg));
  border-color: var(--accent-border);
  color: var(--accent);
  box-shadow: var(--accent-glow), var(--success-glow);
}

.phase-btn:not(.active):not(.complete):hover {
  color: var(--text-primary);
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-active);
}

/* ============================
   Action Buttons
   ============================ */
.btn {
  padding: 10px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--text-secondary);
}

.btn:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
}

.btn-primary {
  background: var(--accent-bg);
  border-color: var(--accent-border);
  color: var(--accent);
}

.btn-primary:hover {
  background: rgba(94, 174, 255, 0.28);
  box-shadow: var(--accent-glow);
}

.btn-danger {
  background: var(--danger-bg);
  border-color: var(--danger-border);
  color: var(--danger);
}

.btn-danger:hover {
  background: rgba(231, 76, 60, 0.28);
}

/* Help trigger button */
.help-trigger {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  transition: color 0.15s ease, background 0.15s ease, transform 0.15s ease;
}
.help-trigger:hover { color: var(--accent); background: var(--accent-bg); transform: scale(1.05); }
.help-trigger:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* Slide-in panel */
.help-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 380px;
  max-width: 100vw;
  height: 100dvh;
  background: rgba(20, 32, 46, 0.96);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-left: 1px solid var(--glass-border);
  box-shadow: -12px 0 40px rgba(0,0,0,0.4);
  transform: translateX(100%);
  transition: transform 0.25s ease;
  z-index: 1000;
  overflow-y: auto;
}
.help-panel.open { transform: translateX(0); }
.help-panel[aria-hidden="true"] { visibility: hidden; }
.help-panel.open[aria-hidden="true"] { visibility: visible; }

.help-panel-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 999;
}
.help-panel-backdrop.open { opacity: 1; pointer-events: auto; }

.help-panel-inner { padding: 20px 22px 40px; }
.help-panel-head  { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.help-panel-head h2 { font-size: 1.05rem; font-weight: 700; color: var(--text-primary); margin: 0; }
.help-panel-close {
  width: 32px; height: 32px; border-radius: 50%;
  background: transparent; border: 1px solid var(--glass-border);
  color: var(--text-secondary); font-size: 1.2rem; line-height: 1; cursor: pointer;
}
.help-panel-close:hover { color: var(--text-primary); background: var(--glass-bg-hover); }

.help-topic { padding: 16px 0; border-top: 1px solid var(--glass-border); }
.help-topic:first-of-type { border-top: none; }
.help-topic h3 { font-size: 0.9rem; font-weight: 700; color: var(--text-primary); margin: 0 0 6px; }
.help-topic p  { font-size: 0.85rem; line-height: 1.6; color: var(--text-secondary); margin: 0 0 8px; }
.help-topic strong { color: var(--text-primary); }
.help-more {
  display: inline-block; font-size: 0.78rem; font-weight: 600;
  color: var(--accent); text-decoration: none; padding: 4px 0;
}
.help-more:hover { text-decoration: underline; }

@media (max-width: 480px) {
  .help-panel { width: 100vw; border-left: none; }
}

/* ---------------------------------------------------------------------------
   Side panel — generic slide-in drawer.
   Same visual language as .help-panel, but reusable: .help-panel predates this
   and owns a singleton backdrop id, so it is left alone rather than refactored.
   --------------------------------------------------------------------------- */
.side-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 380px;
  max-width: 100vw;
  height: 100dvh;
  background: rgba(20, 32, 46, 0.96);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-left: 1px solid var(--glass-border);
  box-shadow: -12px 0 40px rgba(0,0,0,0.4);
  transform: translateX(100%);
  transition: transform 0.25s ease;
  z-index: 1000;
  overflow-y: auto;
}
.side-panel.open { transform: translateX(0); }
.side-panel[aria-hidden="true"] { visibility: hidden; }
.side-panel.open[aria-hidden="true"] { visibility: visible; }

.side-panel-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 999;
}
.side-panel-backdrop.open { opacity: 1; pointer-events: auto; }

.side-panel-inner { padding: 20px 22px 40px; }
.side-panel-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 8px;
}
.side-panel-head h2 { font-size: 1.05rem; font-weight: 700; color: var(--text-primary); margin: 0; }
.side-panel-close {
  width: 32px; height: 32px; border-radius: 50%;
  background: transparent; border: 1px solid var(--glass-border);
  color: var(--text-secondary); font-size: 1.2rem; line-height: 1; cursor: pointer;
}
.side-panel-close:hover { color: var(--text-primary); background: var(--glass-bg-hover); }

@media (max-width: 480px) {
  .side-panel { width: 100vw; border-left: none; }
}

/* Court name captions — used by both the viewer and the editor courts.
   Drawn with paint-order:stroke so the halo sits behind the glyphs and the
   name stays readable over the orange court and over other players. */
.player-caption {
  font-size: 7.5px;
  font-weight: 700;
  fill: #fff;
  paint-order: stroke;
  stroke: rgba(0, 0, 0, 0.75);
  stroke-width: 2.4px;
  stroke-linejoin: round;
  text-anchor: middle;
  pointer-events: none;
}

/* Language switcher inside the nav menu */
.nav-lang {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  padding: 8px 10px;
}
.nav-lang-btn {
  padding: 7px 6px;
  font-size: 0.78rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--text-secondary);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
}
.nav-lang-btn:hover { color: var(--text-primary); background: var(--glass-bg-hover); }
.nav-lang-btn.active {
  color: var(--accent);
  background: var(--accent-bg);
  border-color: var(--accent-border);
}