:root {
  --color-brand-light: #2563eb;
  --color-brand-dark: #3b82f6;
  --color-bg-light: #f8fafc;
  --color-bg-dark: #0f172a;
  --color-text-light: #0f172a;
  --color-text-dark: #f8fafc;
  --color-glass-light: rgba(255, 255, 255, 0.7);
  --color-glass-dark: rgba(15, 23, 42, 0.7);
  --color-glass-border-light: rgba(255, 255, 255, 0.5);
  --color-glass-border-dark: rgba(255, 255, 255, 0.1);
  --color-error: #ef4444;
  --color-success: #10b981;

  --color-brand: light-dark(var(--color-brand-light), var(--color-brand-dark));
  --color-bg: light-dark(var(--color-bg-light), var(--color-bg-dark));
  --color-text: light-dark(var(--color-text-light), var(--color-text-dark));
  --color-glass: light-dark(var(--color-glass-light), var(--color-glass-dark));
  --color-glass-border: light-dark(var(--color-glass-border-light), var(--color-glass-border-dark));

  color-scheme: light dark;
  font-family: 'Inter', sans-serif;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

*, *::before, *::after {
  box-sizing: inherit;
}

body {
  margin: 0;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  background-color: var(--color-bg);
  color: var(--color-text);
  display: flex;
  justify-content: center;
  align-items: center;
}

.screen {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s ease;
  z-index: 10;
}

.screen.active {
  opacity: 1;
  pointer-events: auto;
}

.glass-panel {
  background: var(--color-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--color-glass-border);
  border-radius: 24px;
  padding: 2rem;
  text-align: center;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
  max-width: 90%;
  width: 400px;
}

h1 {
  margin-top: 0;
  font-weight: 800;
  font-size: 1.8rem;
  background: -webkit-linear-gradient(45deg, var(--color-brand), #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

p {
  line-height: 1.5;
  color: var(--color-text);
  opacity: 0.8;
}

/* Debug Log — hidden unless it has content */
#debug-log {
  display: none;
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.85);
  color: #4ade80;
  font-family: monospace;
  font-size: 10px;
  padding: 6px 8px;
  max-height: 160px;
  overflow-y: auto;
  width: calc(100% - 20px);
  max-width: 500px;
  border-radius: 8px;
  pointer-events: none;
  border: 1px solid rgba(74, 222, 128, 0.3);
}

#debug-log:not(:empty) {
  display: block;
}

.primary-btn {
  background: var(--color-brand);
  color: #ffffff;
  border: none;
  padding: 1rem 2rem;
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
  margin-top: 2rem;
  width: 100%;
}

.primary-btn:active {
  transform: scale(0.95);
}

.primary-btn:disabled {
  background: #64748b;
  cursor: not-allowed;
  box-shadow: none;
  transform: scale(1);
}

.secondary-btn {
  background: transparent;
  color: var(--color-brand);
  border: 2px solid var(--color-brand);
  padding: 0.85rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, transform 0.2s;
  margin-top: 1rem;
  width: 100%;
}

.secondary-btn:hover {
  background: var(--color-brand);
  color: #ffffff;
}

.secondary-btn:active {
  transform: scale(0.95);
}

/* Next button hidden by default; JS reveals it after capture */
#next-btn {
  display: none;
}

/* Tutorial Animation */
.tutorial-animation {
  position: relative;
  width: 150px;
  height: 150px;
  margin: 2rem auto;
}

.orbit-path {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 2px dashed var(--color-brand);
  border-radius: 50%;
  opacity: 0.5;
  transform: rotateX(60deg);
}

.phone-icon {
  position: absolute;
  font-size: 2rem;
  top: 50%;
  left: 50%;
  transform-origin: -35px 0;
  animation: orbit 3s linear infinite;
}

@keyframes orbit {
  0% { transform: translate(-50%, -50%) rotate(0deg) translateX(75px) rotate(0deg); }
  100% { transform: translate(-50%, -50%) rotate(360deg) translateX(75px) rotate(-360deg); }
}

/* Camera Screen */
#camera-wrapper {
  position: absolute;
  inset: 14px;
  border-radius: 20px;
  overflow: hidden;
  z-index: 1;
}

#camera-feed {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

#overlay-canvas {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
  object-fit: cover;
}

.overlay-ui {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 3;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1rem;
}

.top-bar {
  display: flex;
  align-items: center;
  padding: 1rem;
  gap: 1rem;
  width: 100%;
  max-width: 500px;
  margin: 0 auto;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: white;
}

/* Progress Ring */
.progress-ring-wrapper {
  position: relative;
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
}

@property --value {
  syntax: '<number>';
  inherits: true;
  initial-value: 0;
}

progress.progress-ring {
  --size: 50px;
  --thickness: 6px;
  --track-color: rgba(255, 255, 255, 0.2);
  --fill-color: var(--color-brand);
  --value: attr(value type(<number>));
  width: var(--size);
  height: var(--size);
  appearance: none;
  -webkit-appearance: none;

  transition: --value 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 50%;

  background: conic-gradient(
    var(--fill-color) calc(var(--value) * 10%),
    var(--track-color) 0
  );
  
  /* background-clip: border-area fallback for Safari/Firefox */
  mask-image: radial-gradient(
    transparent calc(50% - var(--thickness)),
    black calc(50% - var(--thickness) + 0.5px)
  );
  -webkit-mask-image: radial-gradient(
    transparent calc(50% - var(--thickness)),
    black calc(50% - var(--thickness) + 0.5px)
  );
  border: 0;
}

progress.progress-ring[value="10"] {
  --fill-color: var(--color-success);
}

progress.progress-ring::-webkit-progress-bar { display: none; background: none; }
progress.progress-ring::-webkit-progress-value { display: none; background: none; }
progress.progress-ring::-moz-progress-bar { display: none; background: none; }

.progress-ring-content {
  position: absolute;
  font-size: 0.8rem;
  font-weight: 800;
  color: white;
}

.status-text {
  font-weight: 600;
  font-size: 1.1rem;
}

/* Reticle */
.reticle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60vw;
  height: 60vw;
  max-width: 300px;
  max-height: 300px;
  pointer-events: none;
}

.corner {
  position: absolute;
  width: 30px;
  height: 30px;
  border-color: rgba(255, 255, 255, 0.8);
  border-style: solid;
  border-width: 0;
  transition: all 0.3s;
}

.corner.tl { top: 0; left: 0; border-top-width: 4px; border-left-width: 4px; border-top-left-radius: 12px; }
.corner.tr { top: 0; right: 0; border-top-width: 4px; border-right-width: 4px; border-top-right-radius: 12px; }
.corner.bl { bottom: 0; left: 0; border-bottom-width: 4px; border-left-width: 4px; border-bottom-left-radius: 12px; }
.corner.br { bottom: 0; right: 0; border-bottom-width: 4px; border-right-width: 4px; border-bottom-right-radius: 12px; }

.reticle-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.5);
}

.recording .corner {
  border-color: var(--color-success);
  box-shadow: 0 0 15px rgba(16, 185, 129, 0.5);
}
.recording .reticle-center {
  background: var(--color-success);
}

/* Toast Container */
#toast-container {
  position: absolute;
  bottom: 2rem;
  left: 0;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  background: rgba(239, 68, 68, 0.9);
  color: white;
  padding: 0.8rem 1.5rem;
  border-radius: 999px;
  font-weight: 600;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
  transition: opacity 0.3s, transform 0.3s;
  animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Segment Ring — full-screen canvas tracing the camera-wrapper border */
#segment-ring {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 2;  /* above camera-wrapper, below overlay-ui */
}

/* Snap flash — brief white pulse on reticle corners when a frame is captured */
@keyframes snap-flash {
  0%   { border-color: #ffffff; box-shadow: 0 0 20px rgba(255,255,255,0.9); }
  100% { border-color: var(--color-success); box-shadow: 0 0 15px rgba(16,185,129,0.5); }
}

.recording.snap-flash .corner {
  animation: snap-flash 0.5s ease-out forwards;
}