:root {
  --primary: #007AFF;
  --bg: #F2F2F7;
  --card-bg: rgba(255, 255, 255, 0.78);
  --border: rgba(0,0,0,0.08);
  --text: #1C1C1E;
  --muted: #6E6E73;
  --shadow: 0 14px 40px rgba(0,0,0,0.10);
  --blur: blur(18px);
}

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background:
    radial-gradient(1200px 600px at 50% 0%, rgba(0,122,255,0.14), transparent 60%),
    linear-gradient(180deg, #EAF2FF, #F7F7FA);
  display: flex;
  justify-content: center;
  color: var(--text);
}

.app-container {
  width: 100%;
  max-width: 420px;
  min-height: 100vh;
  padding-bottom: 28px;
}

.app-header {
  padding: 42px 20px 18px;
  text-align: center;
}

.app-header h1 {
  margin: 0;
  font-size: 28px;
  letter-spacing: -0.04em;
  color: var(--primary);
}

.subtitle {
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--muted);
}

/* Install Button */
.install-btn {
  margin-top: 16px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  border-radius: 12px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.install-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

.install-btn:active {
  transform: translateY(0);
}

.content { padding: 20px; }

.card {
  background: var(--card-bg);
  border-radius: 22px;
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  text-align: center;
}

h2 { margin: 0 0 8px; font-size: 20px; letter-spacing: -0.03em; }
.instruction { margin: 0 0 16px; font-size: 14px; color: var(--muted); line-height: 1.35; }

.preview-container {
  height: 210px;
  border-radius: 16px;
  background: rgba(255,255,255,0.6);
  border: 1px dashed rgba(0,0,0,0.18);
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 18px;
  overflow: hidden;
}

#imagePreview { width: 100%; height: 100%; object-fit: cover; border-radius: 16px; }
.icon-placeholder { font-size: 40px; color: rgba(0,0,0,0.35); }

.file-upload-btn {
  display: block;
  background: rgba(255,255,255,0.85);
  border-radius: 16px;
  padding: 14px;
  font-weight: 700;
  cursor: pointer;
  border: 1px solid rgba(0,0,0,0.10);
  margin-bottom: 12px;
  transition: all 0.2s ease;
}

.file-upload-btn:hover {
  background: rgba(255,255,255,1);
  border-color: var(--primary);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,122,255,0.15);
}

.file-upload-btn:active {
  transform: translateY(0);
}

.primary-btn {
  width: 100%;
  background: linear-gradient(180deg, #2F80FF, #0A63FF);
  color: white;
  border: none;
  border-radius: 18px;
  padding: 16px;
  font-size: 16px;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 14px 30px rgba(10,99,255,0.24);
  transition: all 0.3s ease;
}

.primary-btn:not(:disabled):hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 35px rgba(10,99,255,0.35);
}

.primary-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  box-shadow: none;
}

.primary-btn:active { transform: scale(0.99); }

/* Smooth fade-in animation */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.result-card {
  animation: fadeInUp 0.4s ease-out;
}

.status-badge {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 999px;
  font-weight: 800;
  margin-bottom: 14px;
}

.score-container { margin: 12px 0 10px; }
.score-label { font-size: 12px; color: var(--muted); letter-spacing: 0.08em; text-transform: uppercase; }
.score-value { font-size: 40px; font-weight: 900; }

.reasoning-box {
  background: rgba(255,255,255,0.62);
  border-radius: 16px;
  padding: 14px;
  text-align: left;
  font-size: 14px;
  line-height: 1.5;
}

.disclaimer { font-size: 11px; color: var(--muted); margin-top: 12px; }
.hidden { display: none; }