@import url('https://fonts.googleapis.com/css2?family=Lexend:wght@300;400;600;700;900&family=JetBrains+Mono:wght@400;700&display=swap');

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

:root {
  --bg:       #060A07;
  --bg1:      #0C150E;
  --bg2:      #111D13;
  --green:    #22C55E;
  --green2:   #16A34A;
  --green3:   #BBF7D0;
  --yellow:   #FACC15;
  --red:      #EF4444;
  --red2:     #DC2626;
  --white:    #F0FDF4;
  --muted:    #4ADE80;
  --dim:      #166534;
  --font:     'Lexend', sans-serif;
  --mono:     'JetBrains Mono', monospace;
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--white);
  font-family: var(--font);
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

/* ── SCREENS ── */
.screen { position: fixed; inset: 0; display: none; flex-direction: column; }
.screen.active { display: flex; }

/* ═══════════════════════════════
   WELCOME SCREEN
═══════════════════════════════ */
#welcome {
  align-items: center;
  justify-content: center;
  gap: 0;
  background: var(--bg);
  padding: 32px 24px;
  text-align: center;
}

.logo-ring {
  width: 140px; height: 140px;
  border-radius: 50%;
  border: 3px solid var(--green);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 28px;
  position: relative;
  animation: spin-ring 8s linear infinite;
}

.logo-ring::before {
  content: '';
  position: absolute; inset: -8px;
  border-radius: 50%;
  border: 1px solid rgba(34,197,94,0.2);
}

@keyframes spin-ring {
  from { box-shadow: 0 0 30px rgba(34,197,94,0.15), 0 0 60px rgba(34,197,94,0.05); }
  50%  { box-shadow: 0 0 50px rgba(34,197,94,0.35), 0 0 100px rgba(34,197,94,0.12); }
  to   { box-shadow: 0 0 30px rgba(34,197,94,0.15), 0 0 60px rgba(34,197,94,0.05); }
}

.logo-icon { font-size: 60px; line-height: 1; }

h1 {
  font-size: 42px;
  font-weight: 900;
  letter-spacing: -1px;
  color: var(--white);
  line-height: 1;
  margin-bottom: 8px;
}

h1 span { color: var(--green); }

.tagline {
  font-size: 15px;
  color: var(--muted);
  font-weight: 300;
  margin-bottom: 40px;
  letter-spacing: 0.04em;
}

.start-btn {
  width: 100%;
  max-width: 340px;
  padding: 24px;
  border-radius: 20px;
  border: none;
  background: var(--green);
  color: #021a09;
  font-family: var(--font);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0.02em;
  cursor: pointer;
  margin-bottom: 16px;
  transition: transform 0.12s, background 0.12s;
  -webkit-tap-highlight-color: transparent;
  position: relative;
  overflow: hidden;
}

.start-btn::after {
  content: '';
  position: absolute; inset: 0;
  background: rgba(255,255,255,0);
  transition: background 0.1s;
}

.start-btn:active { transform: scale(0.97); background: var(--green2); }

.perm-note {
  font-size: 12px;
  color: var(--dim);
  max-width: 280px;
  line-height: 1.6;
}

.feature-pills {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
  justify-content: center;
}

.pill {
  background: var(--bg2);
  border: 1px solid var(--dim);
  border-radius: 30px;
  padding: 6px 14px;
  font-size: 12px;
  color: var(--muted);
  font-weight: 600;
  letter-spacing: 0.04em;
}

/* ═══════════════════════════════
   MAIN APP SCREEN
═══════════════════════════════ */
#app {
  flex-direction: column;
  background: var(--bg);
}

/* ── STATUS BAR ── */
#statusbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--bg1);
  border-bottom: 1px solid rgba(34,197,94,0.12);
  flex-shrink: 0;
  z-index: 10;
}

.app-wordmark {
  font-size: 15px;
  font-weight: 900;
  color: var(--green);
  letter-spacing: 0.06em;
  font-family: var(--mono);
}

.status-pills {
  display: flex;
  gap: 6px;
  align-items: center;
}

.badge {
  font-size: 10px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 20px;
  font-family: var(--mono);
  letter-spacing: 0.06em;
}

.badge.on  { background: rgba(34,197,94,0.15); color: var(--green); border: 1px solid rgba(34,197,94,0.3); }
.badge.off { background: rgba(255,255,255,0.05); color: #4b5563; border: 1px solid #1f2937; }
.badge.warn { background: rgba(250,204,21,0.12); color: var(--yellow); border: 1px solid rgba(250,204,21,0.3); }
.badge.danger { background: rgba(239,68,68,0.15); color: var(--red); border: 1px solid rgba(239,68,68,0.3); animation: flash-badge 0.4s ease-in-out infinite alternate; }

@keyframes flash-badge { from{opacity:1} to{opacity:0.4} }

/* ── CAMERA VIEW ── */
#cam-section {
  position: relative;
  flex: 1;
  overflow: hidden;
  background: #000;
  min-height: 0;
}

#video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scaleX(-1);
  display: block;
}

#overlay-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  transform: scaleX(-1);
}

/* Zone grid lines */
#grid-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* Alert banner on camera */
#alert-banner {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 12px 16px;
  font-size: 17px;
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.04em;
  transition: all 0.2s;
  display: none;
  border-top: 2px solid currentColor;
}

#alert-banner.safe   { display:block; background:rgba(22,163,74,0.88);  color:#dcfce7; border-color:#22c55e; }
#alert-banner.warn   { display:block; background:rgba(202,138,4,0.92);  color:#fefce8; border-color:#facc15; }
#alert-banner.danger { display:block; background:rgba(185,28,28,0.95);  color:#fef2f2; border-color:#ef4444; animation: pulse-banner 0.35s ease-in-out infinite alternate; }

@keyframes pulse-banner { from{transform:scaleY(1)} to{transform:scaleY(1.04)} }

/* Camera off message */
#cam-off-msg {
  position:absolute; inset:0;
  display:flex; flex-direction:column;
  align-items:center; justify-content:center;
  gap:12px; background:#060A07;
  display:none;
}

#cam-off-msg .ico { font-size:48px; }
#cam-off-msg p { color:var(--muted); font-size:14px; text-align:center; max-width:200px; }

/* ── CONTROLS PANEL ── */
#controls {
  flex-shrink: 0;
  background: var(--bg1);
  border-top: 1px solid rgba(34,197,94,0.12);
  padding: 12px 12px 16px;
}

/* Big action buttons grid */
.btn-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 8px;
}

.big-btn {
  padding: 18px 12px;
  border-radius: 16px;
  border: 2px solid;
  background: transparent;
  font-family: var(--font);
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  transition: all 0.12s;
  -webkit-tap-highlight-color: transparent;
  letter-spacing: 0.02em;
  position: relative;
  overflow: hidden;
}

.big-btn .btn-ico { font-size: 26px; line-height: 1; }
.big-btn:active { transform: scale(0.96); }

.big-btn.green-btn {
  border-color: var(--green);
  color: var(--green);
  background: rgba(34,197,94,0.07);
}
.big-btn.green-btn.active {
  background: rgba(34,197,94,0.18);
  box-shadow: 0 0 20px rgba(34,197,94,0.2);
}

.big-btn.red-btn {
  border-color: var(--red);
  color: var(--red);
  background: rgba(239,68,68,0.07);
}
.big-btn.red-btn.active {
  background: rgba(239,68,68,0.18);
  box-shadow: 0 0 20px rgba(239,68,68,0.2);
}

.big-btn.yellow-btn {
  border-color: var(--yellow);
  color: var(--yellow);
  background: rgba(250,204,21,0.06);
}
.big-btn.yellow-btn.active {
  background: rgba(250,204,21,0.15);
}

.big-btn.dim-btn {
  border-color: #1f2937;
  color: #6b7280;
  background: rgba(255,255,255,0.02);
}

/* Sensitivity row */
.sens-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sens-label {
  font-size: 11px;
  color: var(--dim);
  font-family: var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  flex-shrink: 0;
  width: 70px;
}

.sens-track {
  flex: 1;
  height: 36px;
  background: var(--bg2);
  border-radius: 10px;
  border: 1px solid rgba(34,197,94,0.12);
  display: flex;
  overflow: hidden;
}

.sens-seg {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  font-family: var(--mono);
  cursor: pointer;
  transition: all 0.15s;
  color: #374151;
  border-right: 1px solid rgba(34,197,94,0.08);
  letter-spacing: 0.06em;
}

.sens-seg:last-child { border-right: none; }

.sens-seg[data-level="1"].sel { background: rgba(34,197,94,0.2); color: var(--green); }
.sens-seg[data-level="2"].sel { background: rgba(250,204,21,0.2); color: var(--yellow); }
.sens-seg[data-level="3"].sel { background: rgba(239,68,68,0.2); color: var(--red); }

/* ── HAPTIC ZONE DISPLAY (small) ── */
#zone-display {
  position: absolute;
  top: 10px;
  left: 10px;
  display: grid;
  grid-template-columns: repeat(3, 34px);
  grid-template-rows: repeat(2, 28px);
  gap: 2px;
  pointer-events: none;
}

.zc {
  border-radius: 5px;
  border: 1px solid rgba(34,197,94,0.15);
  background: rgba(6,10,7,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  font-family: var(--mono);
  font-weight: 700;
  color: rgba(34,197,94,0.25);
  letter-spacing: 0.04em;
  transition: all 0.15s;
}

.zc.lit-safe   { background:rgba(34,197,94,0.25);  border-color:var(--green);  color:var(--green3); }
.zc.lit-warn   { background:rgba(250,204,21,0.2);  border-color:var(--yellow); color:var(--yellow); }
.zc.lit-danger { background:rgba(239,68,68,0.3);   border-color:var(--red);    color:#fca5a5; animation:zone-flash 0.3s ease infinite alternate; }

@keyframes zone-flash { from{opacity:1} to{opacity:0.5} }

/* ── DIRECTION ARROW ── */
#direction-box {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(6,10,7,0.82);
  border: 1px solid rgba(34,197,94,0.2);
  border-radius: 12px;
  padding: 8px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  pointer-events: none;
  min-width: 56px;
}

#big-dir-arrow {
  font-size: 30px;
  line-height: 1;
  color: var(--green);
  transition: all 0.25s;
}

#dir-label {
  font-size: 9px;
  font-family: var(--mono);
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ── NO CAMERA overlay ── */
#no-cam {
  position: absolute;
  inset: 0;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  display: none;
}
#no-cam .nc-ico { font-size: 52px; }
#no-cam p { color: var(--muted); font-size: 14px; text-align:center; max-width:220px; line-height:1.6; }
#no-cam button {
  padding: 14px 28px;
  background: var(--green);
  color: #021a09;
  border: none;
  border-radius: 14px;
  font-family: var(--font);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}

/* ── LAST ALERT ── */
#last-alert-box {
  position:absolute;
  bottom: 56px; left:10px; right:10px;
  background: rgba(6,10,7,0.85);
  border: 1px solid rgba(34,197,94,0.2);
  border-radius: 10px;
  padding: 8px 12px;
  font-size: 12px;
  color: var(--muted);
  font-family: var(--mono);
  letter-spacing: 0.02em;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s;
  display: flex; align-items: center; gap: 8px;
}

#last-alert-box.visible { opacity: 1; }
#last-alert-dot { width:6px;height:6px;border-radius:50%;background:var(--green);flex-shrink:0; }

/* ── ACCESSIBILITY: focus rings ── */
button:focus-visible {
  outline: 3px solid var(--green);
  outline-offset: 3px;
}

/* ── SCAN LINE animation on camera ── */
#scan-line {
  position: absolute;
  left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(34,197,94,0.6), transparent);
  top: 0;
  animation: scan 3s ease-in-out infinite;
  pointer-events: none;
}

@keyframes scan {
  0%   { top: 0%;   opacity: 0; }
  10%  { opacity: 1; }
  90%  { opacity: 1; }
  100% { top: 100%; opacity: 0; }
}

/* Pulse on detection */
@keyframes cam-pulse {
  0%   { box-shadow: inset 0 0 0px rgba(239,68,68,0); }
  50%  { box-shadow: inset 0 0 40px rgba(239,68,68,0.35); }
  100% { box-shadow: inset 0 0 0px rgba(239,68,68,0); }
}
#cam-section.danger-pulse { animation: cam-pulse 0.4s ease-in-out; }