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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: linear-gradient(135deg, #0b1120 0%, #111827 50%, #0f172a 100%);
  color: #e2e8f0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.container {
  width: 100%;
  max-width: 480px;
  padding: 20px;
}

.card {
  background: rgba(30, 41, 59, 0.85);
  backdrop-filter: blur(12px);
  border-radius: 20px;
  padding: 36px 28px;
  border: 1px solid rgba(51, 65, 85, 0.6);
  box-shadow:
    0 0 0 1px rgba(59, 130, 246, 0.05),
    0 25px 50px -12px rgba(0, 0, 0, 0.6);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, #3b82f6, #8b5cf6, transparent);
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 6px;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  color: white;
  flex-shrink: 0;
}

h1 {
  font-size: 24px;
  font-weight: 700;
  text-align: center;
  color: #f8fafc;
  letter-spacing: -0.3px;
}

.subtitle {
  text-align: center;
  color: #94a3b8;
  font-size: 13px;
  margin-top: 4px;
  margin-bottom: 24px;
  line-height: 1.5;
}

.upload-area {
  border: 2px dashed rgba(71, 85, 105, 0.5);
  border-radius: 14px;
  padding: 44px 20px 40px;
  text-align: center;
  cursor: pointer;
  transition: all 0.35s ease;
  background: rgba(15, 23, 42, 0.6);
  position: relative;
}

.upload-area:hover, .upload-area.drag-over {
  border-color: #3b82f6;
  background: rgba(30, 58, 95, 0.5);
  transform: translateY(-1px);
}

.upload-area.drag-over {
  border-color: #22d3ee;
  background: rgba(15, 23, 42, 0.8);
  box-shadow: 0 0 30px rgba(34, 211, 238, 0.08);
}

.upload-icon {
  color: #475569;
  margin-bottom: 14px;
  transition: color 0.3s, transform 0.3s;
}

.upload-area:hover .upload-icon {
  color: #3b82f6;
  transform: scale(1.05);
}

.upload-area.drag-over .upload-icon {
  color: #22d3ee;
  transform: scale(1.1);
}

.upload-text {
  color: #94a3b8;
  font-size: 14px;
  margin-bottom: 6px;
  font-weight: 500;
}

.upload-hint {
  color: #64748b;
  font-size: 12px;
  font-weight: 400;
}

.status {
  text-align: center;
  padding: 14px 18px;
  margin-top: 16px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 500;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(51, 65, 85, 0.5);
  transition: opacity 0.3s;
}

.status.processing {
  color: #fbbf24;
  border-color: rgba(251, 191, 36, 0.3);
  background: rgba(251, 191, 36, 0.06);
}

.status.error {
  color: #f87171;
  border-color: rgba(248, 113, 113, 0.3);
  background: rgba(248, 113, 113, 0.06);
}

.status.success {
  color: #4ade80;
  border-color: rgba(74, 222, 128, 0.3);
  background: rgba(74, 222, 128, 0.06);
}

.result {
  text-align: center;
  margin-top: 16px;
  padding: 24px 20px 22px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(6, 78, 59, 0.6), rgba(5, 150, 105, 0.15));
  border: 1px solid rgba(5, 150, 105, 0.4);
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-icon {
  font-size: 40px;
  color: #10b981;
  margin-bottom: 6px;
  line-height: 1;
}

.result p {
  color: #a7f3d0;
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 4px;
}

.size-info {
  font-size: 11px;
  color: #6ee7b7;
  margin-bottom: 18px;
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  opacity: 0.8;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  color: white;
  border: none;
  padding: 12px 36px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  letter-spacing: 0.2px;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.25);
}

.btn:hover {
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.35);
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.2);
}

.hidden {
  display: none !important;
}

.footer {
  text-align: center;
  margin-top: 20px;
  color: rgba(71, 85, 105, 0.7);
  font-size: 11px;
  letter-spacing: 0.2px;
}