/* =====================================================
   MAIN.CSS — Core layout and theme variables
   HDD Interactive Teaching Tool
   ===================================================== */

:root {
  --bg:         #0a0a0f;
  --bg-panel:   #0d0d1a;
  --bg-card:    #101020;
  --border:     #1a1a3a;

  --cyan:       #00f0ff;
  --cyan-dim:   #004a50;
  --purple:     #7b2fff;
  --purple-dim: #2a1050;
  --pink:       #ff3de8;
  --pink-dim:   #50103a;
  --amber:      #ffcc00;
  --amber-dim:  #503d00;
  --green:      #00ff88;
  --red:        #ff4455;

  --text:       #e0e8f0;
  --text-dim:   #5a6a80;
  --text-label: #8ab4c8;

  --font-mono:  'Courier New', 'Lucida Console', monospace;
  --font-ui:    'Segoe UI', system-ui, sans-serif;

  --panel-w:    360px;
  --header-h:   56px;
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 14px;

  /* Subtle grid background */
  background-image:
    radial-gradient(circle at 50% 50%, #0f0f25 0%, #0a0a0f 70%),
    linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
  background-size: 100% 100%, 40px 40px, 40px 40px;
  background-position: 0 0, -1px -1px, -1px -1px;
}

/* ── App wrapper ─────────────────────────────────── */
#app {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
}

/* ── Header ──────────────────────────────────────── */
#site-header {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  padding: 0 20px;
  background: rgba(10, 10, 25, 0.95);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

#site-header h1 {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--cyan);
  text-shadow: 0 0 8px var(--cyan), 0 0 20px rgba(0,240,255,0.4);
}

#site-header h1 span {
  color: var(--text-dim);
}

/* ── Control buttons ─────────────────────────────── */
#controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.ctrl-btn {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan);
  background: transparent;
  border: 1px solid var(--cyan-dim);
  border-radius: 3px;
  padding: 5px 14px;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.ctrl-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--cyan);
  opacity: 0;
  transition: opacity 0.2s;
}

.ctrl-btn:hover {
  border-color: var(--cyan);
  color: var(--bg);
  box-shadow: 0 0 12px rgba(0,240,255,0.5);
}

.ctrl-btn:hover::before { opacity: 1; }
.ctrl-btn:hover span { position: relative; z-index: 1; color: var(--bg); }

.ctrl-btn span { position: relative; z-index: 1; }

.ctrl-btn.active {
  background: var(--cyan-dim);
  border-color: var(--cyan);
  box-shadow: 0 0 8px rgba(0,240,255,0.3);
}

.ctrl-btn.amber {
  color: var(--amber);
  border-color: var(--amber-dim);
}
.ctrl-btn.amber:hover {
  border-color: var(--amber);
  box-shadow: 0 0 12px rgba(255,204,0,0.5);
}
.ctrl-btn.amber:hover::before { background: var(--amber); opacity: 1; }

/* ── Devices / home button ───────────────────────── */
#btn-home.btn-home-devices {
  color: var(--text-dim);
  border-color: var(--border);
  padding: 5px 16px;
  font-size: 11px;
  letter-spacing: 0.12em;
  transition: all 0.2s;
}

#btn-home.btn-home-devices:hover {
  color: var(--cyan);
  border-color: var(--cyan-dim);
  box-shadow: 0 0 10px rgba(0,240,255,0.2);
}

#btn-home.btn-home-devices:hover::before { background: transparent; opacity: 0; }
#btn-home.btn-home-devices:hover span { color: var(--cyan); }

[data-device="vcr"] #btn-home.btn-home-devices:hover {
  color: var(--cyan);
  border-color: var(--cyan-dim);
}

/* ── Main layout ─────────────────────────────────── */
#main-content {
  flex: 1 1 auto;
  display: flex;
  overflow: hidden;
  position: relative;
}

/* ── Diagram area ────────────────────────────────── */
#diagram-area {
  flex: 1 1 auto;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

#main-view {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.4s, transform 0.4s;
}

#hdd-svg {
  width: 100%;
  height: 100%;
  max-height: calc(100vh - var(--header-h));
  overflow: visible;
  cursor: default;
}

/* ── Component interaction ───────────────────────── */
.hdd-component {
  cursor: pointer;
  transition: transform 0.7s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.hdd-component.selected .comp-body {
  filter: url(#neon-select);
}

.hdd-component.dimmed {
  opacity: 0.25;
  transition: opacity 0.3s, transform 0.7s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.hdd-component path,
.hdd-component ellipse,
.hdd-component rect {
  transition: filter 0.2s;
}

.hdd-component:hover path,
.hdd-component:hover ellipse {
  filter: brightness(1.4);
}

/* ── Hover tooltip ───────────────────────────────── */
#hover-tooltip {
  position: absolute;
  background: rgba(13, 13, 26, 0.95);
  border: 1px solid var(--cyan-dim);
  border-radius: 4px;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
  letter-spacing: 0.08em;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s;
  z-index: 50;
  white-space: nowrap;
  box-shadow: 0 0 10px rgba(0,240,255,0.2);
}

#hover-tooltip.visible {
  opacity: 1;
}

/* ── Subview area ────────────────────────────────── */
#subview-area {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  z-index: 20;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s;
}

#subview-area.visible {
  opacity: 1;
  pointer-events: all;
}

#subview-header {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(10, 10, 20, 0.9);
}

#subview-header h2 {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--purple);
  text-shadow: 0 0 8px var(--purple);
}

#subview-controls {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

#subview-svg-container {
  flex: 1 1 auto;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

#subview-svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

/* ── Back button ─────────────────────────────────── */
#btn-back {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 4px 10px;
  cursor: pointer;
  letter-spacing: 0.08em;
  transition: all 0.2s;
}

#btn-back:hover {
  color: var(--cyan);
  border-color: var(--cyan-dim);
}

/* ── Power rail buttons ──────────────────────────── */
.rail-btn {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  padding: 3px 10px;
  border-radius: 3px;
  cursor: pointer;
  border: 1px solid;
  background: transparent;
  transition: all 0.2s;
}

.rail-btn[data-rail="12v"]  { color: var(--amber); border-color: var(--amber-dim); }
.rail-btn[data-rail="5v"]   { color: var(--cyan);  border-color: var(--cyan-dim);  }
.rail-btn[data-rail="3v3"]  { color: var(--pink);  border-color: var(--pink-dim);  }
.rail-btn[data-rail="all"]  { color: var(--text-dim); border-color: var(--border); }

.rail-btn.active[data-rail="12v"]  { background: var(--amber-dim); border-color: var(--amber); box-shadow: 0 0 6px rgba(255,204,0,0.4); }
.rail-btn.active[data-rail="5v"]   { background: var(--cyan-dim);  border-color: var(--cyan);  box-shadow: 0 0 6px rgba(0,240,255,0.4); }
.rail-btn.active[data-rail="3v3"]  { background: var(--pink-dim);  border-color: var(--pink);  box-shadow: 0 0 6px rgba(255,61,232,0.4); }

/* ── Zoom controls ───────────────────────────────── */
.zoom-sep {
  display: inline-block;
  width: 1px;
  height: 18px;
  background: var(--border);
  margin: 0 6px;
  vertical-align: middle;
  flex-shrink: 0;
}

.zoom-btn {
  padding: 4px 8px !important;
  min-width: 28px;
  font-size: 15px !important;
  letter-spacing: 0 !important;
}

/* ── Labels in SVG ───────────────────────────────── */
.comp-label {
  font-family: var(--font-mono);
  font-size: 10px;
  fill: var(--text-label);
  letter-spacing: 0.05em;
  pointer-events: none;
}

.comp-label-title {
  font-size: 11px;
  fill: var(--cyan);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.leader-line {
  stroke: var(--cyan-dim);
  stroke-width: 0.8;
  pointer-events: none;
}

.leader-dot {
  fill: var(--cyan);
  pointer-events: none;
}

/* ── Loading screen ──────────────────────────────── */
#loading-screen {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  transition: opacity 0.5s;
}

#loading-screen.fade-out {
  opacity: 0;
  pointer-events: none;
}

#loading-title {
  font-family: var(--font-mono);
  font-size: 24px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--cyan);
  text-shadow: 0 0 20px var(--cyan), 0 0 40px rgba(0,240,255,0.5);
  margin-bottom: 8px;
}

#loading-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--text-dim);
  text-transform: uppercase;
}

/* ══════════════════════════════════════════════════
   DEVICE MENU OVERLAY
══════════════════════════════════════════════════ */
#device-menu {
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.5s ease;

  background-image:
    radial-gradient(circle at 50% 40%, #0f0f28 0%, #0a0a0f 65%),
    linear-gradient(rgba(0,240,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,240,255,0.03) 1px, transparent 1px);
  background-size: 100% 100%, 40px 40px, 40px 40px;
  background-position: 0 0, -1px -1px, -1px -1px;
}

#device-menu.visible  { opacity: 1; }
#device-menu.hiding   { opacity: 0; pointer-events: none; }

.device-menu-wordmark {
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 52px);
  font-weight: 700;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--cyan);
  text-shadow: 0 0 30px var(--cyan), 0 0 70px rgba(0,240,255,0.4);
  margin-bottom: 10px;
  text-align: center;
}

.device-menu-headline {
  font-family: var(--font-mono);
  font-size: clamp(11px, 1.4vw, 14px);
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 10px;
  text-align: center;
}

.device-menu-sub {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 0.06em;
  margin-bottom: 52px;
  text-align: center;
  opacity: 0.6;
}

.device-grid {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  justify-content: center;
  padding: 0 20px;
  max-width: 960px;
}

.device-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 28px 28px 24px;
  width: 300px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  position: relative;
  overflow: hidden;
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}

.device-card::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.3s;
  background: radial-gradient(circle at 50% 0%, rgba(0,240,255,0.06) 0%, transparent 70%);
}

.device-card:hover {
  border-color: var(--cyan);
  transform: translateY(-4px);
  box-shadow: 0 8px 40px rgba(0,240,255,0.15), 0 0 0 1px var(--cyan);
}
.device-card:hover::before { opacity: 1; }

.device-card-icon {
  width: 100%;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--cyan);
  opacity: 0.8;
}

.device-card-icon svg {
  width: 120px;
  height: 72px;
}

.device-card-name {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 4px;
}

.device-card-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 14px;
}

.device-card-desc {
  font-size: 12px;
  color: var(--text-label);
  line-height: 1.7;
  margin-bottom: 20px;
  flex: 1;
}

.device-card-cta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 0.2s, transform 0.2s;
}
.device-card:hover .device-card-cta {
  opacity: 1;
  transform: translateX(0);
}

/* VCR device card uses orange accent on hover */
.device-card[data-device="vcr"]:hover {
  border-color: #ff8c00;
  box-shadow: 0 8px 40px rgba(255,140,0,0.15), 0 0 0 1px #ff8c00;
}
.device-card[data-device="vcr"]:hover::before {
  background: radial-gradient(circle at 50% 0%, rgba(255,140,0,0.07) 0%, transparent 70%);
}
.device-card[data-device="vcr"] .device-card-icon { color: #ff8c00; }
.device-card[data-device="vcr"] .device-card-name { color: #ff8c00; }
.device-card[data-device="vcr"] .device-card-cta  { color: #ff8c00; }


/* device-menu footer version tag */
.device-menu-version {
  position: absolute;
  bottom: 20px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--border);
  letter-spacing: 0.1em;
}

/* ══════════════════════════════════════════════════
   VCR THEME — overrides via [data-device="vcr"]
══════════════════════════════════════════════════ */
[data-device="vcr"] {
  --cyan:       #ff8c00;
  --cyan-dim:   #4a2800;
  --purple:     #cc3300;
  --purple-dim: #3a0f00;
  --pink:       #ffdd00;
  --pink-dim:   #4a3900;
  --amber:      #00ddaa;
  --amber-dim:  #004a36;

  --bg:         #0f0b08;
  --bg-panel:   #160e0a;
  --bg-card:    #1a1008;
  --border:     #3a1e0a;

  --text-label: #c8a888;

  background-image:
    radial-gradient(circle at 50% 50%, #1a0f08 0%, #0f0b08 70%),
    linear-gradient(rgba(255,140,0,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,140,0,0.03) 1px, transparent 1px);
}

[data-device="vcr"] #site-header h1 {
  color: var(--cyan);
  text-shadow: 0 0 8px var(--cyan), 0 0 20px rgba(255,140,0,0.4);
}

[data-device="vcr"] #subview-header h2 {
  color: #cc3300;
  text-shadow: 0 0 8px #cc3300;
}

[data-device="vcr"] #btn-back:hover { color: var(--cyan); border-color: var(--cyan-dim); }

[data-device="vcr"] .leader-dot  { fill: #ff8c00; }
[data-device="vcr"] .leader-line { stroke: #4a2800; }

[data-device="vcr"] ::-webkit-scrollbar-thumb:hover { background: var(--cyan-dim); }

[data-device="vcr"] #loading-title {
  color: #ff8c00;
  text-shadow: 0 0 20px #ff8c00, 0 0 40px rgba(255,140,0,0.5);
}


/* ── Scrollbar styling ───────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-panel); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--cyan-dim); }

/* ── Mobile: ≤600px ──────────────────────────────── */
@media (max-width: 600px) {
  :root {
    --header-h: 48px;
  }

  /* Device menu: scrollable so all cards reachable on small/landscape screens */
  #device-menu {
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: env(safe-area-inset-bottom, 16px);
    justify-content: flex-start;
    padding-top: clamp(24px, 8vh, 60px);
  }

  /* Compact header with safe area for notch */
  #site-header {
    padding: 0 12px;
    padding-left:  max(12px, env(safe-area-inset-left));
    padding-right: max(12px, env(safe-area-inset-right));
  }

  #site-header h1 {
    font-size: 12px;
    letter-spacing: 0.08em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 90px;
    flex-shrink: 1;
  }

  #site-header h1 span { display: none; }

  /* Prevent any button text from wrapping */
  .ctrl-btn {
    white-space: nowrap;
  }

  #controls { gap: 6px; flex-shrink: 0; }

  .ctrl-btn {
    padding: 4px 10px;
    font-size: 10px;
  }

  /* Diagram fills available space; let zoom.js handle all touch */
  #diagram-area {
    touch-action: none;
  }

  /* Hide hover tooltip on touch devices */
  #hover-tooltip { display: none !important; }

  /* Subview header compact */
  #subview-header {
    padding: 6px 10px;
    gap: 10px;
  }

  #subview-header h2 { font-size: 10px; }

  #btn-back {
    padding: 4px 8px;
    font-size: 10px;
    white-space: nowrap;
  }

  .zoom-btn {
    padding: 6px 10px !important;
    min-width: 36px;
    font-size: 18px !important;
  }

  .zoom-sep { margin: 0 4px; }

  /* Device cards stretch to available width on narrow screens */
  .device-card {
    width: min(300px, calc(100vw - 40px));
  }
}

/* ── Extra-small: ≤360px ─────────────────────────── */
@media (max-width: 360px) {
  #controls { gap: 4px; }

  .ctrl-btn {
    padding: 4px 8px;
    font-size: 9px;
  }

  #btn-home.btn-home-devices {
    padding: 4px 9px;
  }

  #site-header h1 { max-width: 70px; }
}

/* ── Tablet: 601–900px ───────────────────────────── */
@media (min-width: 601px) and (max-width: 900px) {
  :root { --panel-w: 300px; }

  #site-header h1 { font-size: 13px; }
}